[PATCH v6 00/28] Display Stream Compression enabling on eDP/DP

[PATCH v6 00/28] Display Stream Compression enabling on eDP/DP

[Manasi Navare]

VESA has developed an industry standard Display Stream Compression(DSC)
for interoperable, visually lossless compression over display links to
address the needs for higher resolution displays.

This patch series enables DSC on Gen 10 eDP and Gen 11 eDP/DP panels.
This implementation is based on VESA DP 1.4 and DSC specifications.

These patches have been validated on 1080p eDP 1.4 panel with DSC support
and FPGA based DP 1.4 sink device for following configurations:

- DSC with both VDSC engines enabled
- DSC with only Left VDSC engine enabled
- DSC for Input = 24bpp, Output = 8bpp
- DSC for Input = 24bpp, Output = 10bpp
- DSC for Input = 24bpp, output = 12bpp

This revision addresses the review feedback on previous version of the patch set:
https://patchwork.freedesktop.org/series/47514/

Anusha Srivatsa (1):
  drm/i915/dsc: Add slice_row_per_frame in DSC PPS programming

Gaurav K Singh (4):
  drm/dsc: Define VESA Display Stream Compression Capabilities
  drm/i915/dsc: Define & Compute VESA DSC params
  drm/i915/dsc: Compute Rate Control parameters for DSC
  drm/i915/dp: Enable/Disable DSC in DP Sink

Manasi Navare (21):
  drm/dp: Add DP DSC DPCD receiver capability size define and missing
    SHIFT
  drm/i915/dp: Cache the DP/eDP DSC DPCD register set on Hotplug/eDP
    Init
  drm/dp: DRM DP helper/macros to get DP sink DSC parameters
  drm/i915/dp: Add helpers for Compressed BPP and Slice Count for DSC
  drm/i915/dp: Validate modes using max Output BPP and slice count when
    DSC supported
  drm/dp: Define payload size for DP SDP PPS packet
  drm/dsc: Define Display Stream Compression PPS infoframe
  drm/dsc: Add helpers for DSC picture parameter set infoframes
  drm/i915/dp: Add DSC params and DSC config to intel_crtc_state
  drm/i915/dp: Compute DSC pipe config in atomic check
  drm/i915/dp: Do not enable PSR2 if DSC is enabled
  drm/dsc: Define the DSC 1.1 and 1.2 Line Buffer depth constants
  drm/i915/dsc: Add a power domain for VDSC on eDP/MIPI DSI
  drm/i915/dp: Configure i915 Picture parameter Set registers during DSC
    enabling
  drm/i915/dp: Use the existing write_infoframe() for DSC PPS SDPs
  drm/i915/dp: Populate DSC PPS SDP and send PPS infoframes
  drm/i915/dp: Configure Display stream splitter registers during DSC
    enable
  drm/i915/dp: Disable DSC in source by disabling DSS CTL bits
  drm/i915/dsc: Enable and disable appropriate power wells for VDSC
  drm/i915/dsc: Add Per connector debugfs node for DSC support/enable
  drm/i915/dsc: Force DSC enable if requested by IGT/userspace

Srivatsa, Anusha (2):
  drm/dsc: Define Rate Control values that do not change over
    configurations
  drm/i915/icl: Add Display Stream Splitter control registers

 Documentation/gpu/drm-kms-helpers.rst   |   12 +
 drivers/gpu/drm/Makefile                |    2 +-
 drivers/gpu/drm/drm_dp_helper.c         |   90 ++
 drivers/gpu/drm/drm_dsc.c               |  223 +++++
 drivers/gpu/drm/i915/Makefile           |    3 +-
 drivers/gpu/drm/i915/i915_debugfs.c     |   71 +-
 drivers/gpu/drm/i915/i915_drv.h         |    5 +
 drivers/gpu/drm/i915/i915_reg.h         |   35 +
 drivers/gpu/drm/i915/intel_ddi.c        |    5 +
 drivers/gpu/drm/i915/intel_display.c    |   39 +-
 drivers/gpu/drm/i915/intel_display.h    |    4 +-
 drivers/gpu/drm/i915/intel_dp.c         |  361 +++++++-
 drivers/gpu/drm/i915/intel_dp_mst.c     |    2 +-
 drivers/gpu/drm/i915/intel_drv.h        |   24 +
 drivers/gpu/drm/i915/intel_hdmi.c       |   23 +-
 drivers/gpu/drm/i915/intel_psr.c        |   16 +-
 drivers/gpu/drm/i915/intel_runtime_pm.c |    4 +-
 drivers/gpu/drm/i915/intel_vdsc.c       | 1103 +++++++++++++++++++++++
 include/drm/drm_dp_helper.h             |   40 +
 include/drm/drm_dsc.h                   |  491 ++++++++++
 20 files changed, 2503 insertions(+), 50 deletions(-)
 create mode 100644 drivers/gpu/drm/drm_dsc.c
 create mode 100644 drivers/gpu/drm/i915/intel_vdsc.c
 create mode 100644 include/drm/drm_dsc.h

-- 
2.18.0

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[PATCH v6 01/28] drm/i915/dsc: Add slice_row_per_frame in DSC PPS programming

[Manasi Navare]

From: Anusha Srivatsa <anusha.srivatsa@intel.com>

Add the newly added slice_row_per_frame parameter
in the Picture Parameter Set registers.
This defines the number of vertically stacked slices
in a frame.

Credits to Manasi for noticing bSpec change.

Suggested-by: Manasi Navare <manasi.d.navare@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 69eb573348b3..64cca0a83cf7 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -10903,6 +10903,7 @@ enum skl_power_gate {
 #define ICL_DSC1_PICTURE_PARAMETER_SET_16(pipe)	_MMIO_PIPE((pipe) - PIPE_B, \
 							   _ICL_DSC1_PICTURE_PARAMETER_SET_16_PB, \
 							   _ICL_DSC1_PICTURE_PARAMETER_SET_16_PC)
+#define  DSC_SLICE_ROW_PER_FRAME(slice_row_per_frame)	((slice_row_per_frame) << 20)
 #define  DSC_SLICE_PER_LINE(slice_per_line)		((slice_per_line) << 16)
 #define  DSC_SLICE_CHUNK_SIZE(slice_chunk_size)		((slice_chunk_size) << 0)
 
-- 
2.18.0

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[PATCH v6 02/28] drm/dp: Add DP DSC DPCD receiver capability size define and missing SHIFT

[Manasi Navare]

This patch defines the DP DSC receiver capability size that gives
total number of DP DSC DPCD registers.
This also adds a missing #defines for DP DSC support missed in the
commit id (ab6a46ea6842ce "Add DPCD definitions for DP 1.4 DSC feature")

v3:
* MIN_SLICE_WIDTH = 2560 (Anusha)
* Define DP_DSC_SLICE_WIDTH_MULTIPLIER = 320
v2:
* Add SHIFT define and DECOMPRESSION_EN define missed in prev patch

Cc: dri-devel@lists.freedesktop.org
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 include/drm/drm_dp_helper.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 9ad98e8d9ede..dd33d59739f8 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -231,6 +231,8 @@
 #define DP_DSC_MAX_BITS_PER_PIXEL_LOW       0x067   /* eDP 1.4 */
 
 #define DP_DSC_MAX_BITS_PER_PIXEL_HI        0x068   /* eDP 1.4 */
+# define DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK  (0x3 << 0)
+# define DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT 8
 
 #define DP_DSC_DEC_COLOR_FORMAT_CAP         0x069
 # define DP_DSC_RGB                         (1 << 0)
@@ -279,6 +281,8 @@
 # define DP_DSC_THROUGHPUT_MODE_1_1000      (14 << 4)
 
 #define DP_DSC_MAX_SLICE_WIDTH              0x06C
+#define DP_DSC_MIN_SLICE_WIDTH_VALUE        2560
+#define DP_DSC_SLICE_WIDTH_MULTIPLIER       320
 
 #define DP_DSC_SLICE_CAP_2                  0x06D
 # define DP_DSC_16_PER_DP_DSC_SINK          (1 << 0)
@@ -477,6 +481,7 @@
 # define DP_AUX_FRAME_SYNC_VALID	    (1 << 0)
 
 #define DP_DSC_ENABLE                       0x160   /* DP 1.4 */
+# define DP_DECOMPRESSION_EN                (1 << 0)
 
 #define DP_PSR_EN_CFG			    0x170   /* XXX 1.2? */
 # define DP_PSR_ENABLE			    (1 << 0)
@@ -965,6 +970,7 @@ u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SI
 
 #define DP_BRANCH_OUI_HEADER_SIZE	0xc
 #define DP_RECEIVER_CAP_SIZE		0xf
+#define DP_DSC_RECEIVER_CAP_SIZE        0xf
 #define EDP_PSR_RECEIVER_CAP_SIZE	2
 #define EDP_DISPLAY_CTL_CAP_SIZE	3
 
-- 
2.18.0

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[PATCH v6 03/28] drm/i915/dp: Cache the DP/eDP DSC DPCD register set on Hotplug/eDP Init

[Manasi Navare]

DSC is supported on eDP starting GEN 10 display (on GLK) and on DP starting
GEN 11.
This patch implements the discovery phase of DSC. On hotplug,
source reads the DSC DPCD register set (0x00060 - 0x0006F) to
read the decompression capabilities of the sink device.
This entire block of registers is cached in intel_dp so that
capability information can be used during DSC configuration
phase during compute_config phase of the modeset.
For eDP, this caching happens during the eDP initialization.
This caching is done only for eDP and DP rev >= 1.4

v5:
* Fix the block comment (Gaurav)
* Fix the commit message DSC DPCD addresses (Gaurav)
* Use DRM_ERROR for dpcd_read fail (Gaurav,Anusha)
v4:
* Cache these only for Gen >= 11
v3:
* Remove the dsc_sink_support field in intel_dp (Jani N)
v2:
* Clear the cached registers on hotplug always (Jani N)
* Combine the eDP and DP caching in same function (Jani N)

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Gaurav K Singh <gaurav.k.singh@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c  | 32 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h |  1 +
 2 files changed, 33 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 8e64f149ab09..55e070b85c02 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3956,6 +3956,29 @@ intel_dp_read_dpcd(struct intel_dp *intel_dp)
 	return intel_dp->dpcd[DP_DPCD_REV] != 0;
 }
 
+static void intel_dp_get_dsc_sink_cap(struct intel_dp *intel_dp)
+{
+	/*
+	 *Clear the cached register set to avoid using stale values
+	 * for the sinks that do not support DSC.
+	 */
+	memset(intel_dp->dsc_dpcd, 0, sizeof(intel_dp->dsc_dpcd));
+
+	/* Cache the DSC DPCD if eDP or DP rev >= 1.4 */
+	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x14 ||
+	    intel_dp->edp_dpcd[0] >= DP_EDP_14) {
+		if (drm_dp_dpcd_read(&intel_dp->aux, DP_DSC_SUPPORT,
+				     intel_dp->dsc_dpcd,
+				     sizeof(intel_dp->dsc_dpcd)) < 0)
+			DRM_ERROR("Failed to read DPCD register 0x%x\n",
+				  DP_DSC_SUPPORT);
+
+		DRM_DEBUG_KMS("DSC DPCD: %*ph\n",
+			      (int)sizeof(intel_dp->dsc_dpcd),
+			      intel_dp->dsc_dpcd);
+	}
+}
+
 static bool
 intel_edp_init_dpcd(struct intel_dp *intel_dp)
 {
@@ -4032,6 +4055,10 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp)
 
 	intel_dp_set_common_rates(intel_dp);
 
+	/* Read the eDP DSC DPCD registers */
+	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
+		intel_dp_get_dsc_sink_cap(intel_dp);
+
 	return true;
 }
 
@@ -5126,6 +5153,7 @@ intel_dp_detect(struct drm_connector *connector,
 
 	if (status == connector_status_disconnected) {
 		memset(&intel_dp->compliance, 0, sizeof(intel_dp->compliance));
+		memset(intel_dp->dsc_dpcd, 0, sizeof(intel_dp->dsc_dpcd));
 
 		if (intel_dp->is_mst) {
 			DRM_DEBUG_KMS("MST device may have disappeared %d vs %d\n",
@@ -5151,6 +5179,10 @@ intel_dp_detect(struct drm_connector *connector,
 
 	intel_dp_print_rates(intel_dp);
 
+	/* Read DP Sink DSC Cap DPCD regs for DP v1.4 */
+	if (INTEL_GEN(dev_priv) >= 11)
+		intel_dp_get_dsc_sink_cap(intel_dp);
+
 	drm_dp_read_desc(&intel_dp->aux, &intel_dp->desc,
 			 drm_dp_is_branch(intel_dp->dpcd));
 
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index db24308729b4..4cacf0e3fa17 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1109,6 +1109,7 @@ struct intel_dp {
 	uint8_t psr_dpcd[EDP_PSR_RECEIVER_CAP_SIZE];
 	uint8_t downstream_ports[DP_MAX_DOWNSTREAM_PORTS];
 	uint8_t edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
+	u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE];
 	/* source rates */
 	int num_source_rates;
 	const int *source_rates;
-- 
2.18.0

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[PATCH v6 04/28] drm/dp: DRM DP helper/macros to get DP sink DSC parameters

[Manasi Navare]

This patch adds inline functions and helpers for obtaining
DP sink's supported DSC parameters like DSC sink support,
eDP compressed BPP supported, maximum slice count supported
by the sink devices, DSC line buffer bit depth supported on DP sink,
DSC sink maximum color depth by parsing corresponding DPCD registers.

v4:
* Add helper to give line buf bit depth (Manasi)
* Correct the bit masking in color depth helper (manasi)
v3:
* Use SLICE_CAP_2 for DP (Anusha)
v2:
* Add DSC sink support macro (Jani N)

Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Cc: dri-devel@lists.freedesktop.org
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Gaurav K Singh <gaurav.k.singh@intel.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 90 +++++++++++++++++++++++++++++++++
 include/drm/drm_dp_helper.h     | 30 +++++++++++
 2 files changed, 120 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 37c01b6076ec..6d483487f2b4 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1352,3 +1352,93 @@ int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
 	return 0;
 }
 EXPORT_SYMBOL(drm_dp_read_desc);
+
+/**
+ * DRM DP Helpers for DSC
+ */
+u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
+				   bool is_edp)
+{
+	u8 slice_cap1 = dsc_dpcd[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
+
+	if (is_edp) {
+		/* For eDP, register DSC_SLICE_CAPABILITIES_1 gives slice count */
+		if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
+			return 4;
+		if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
+			return 2;
+		if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
+			return 1;
+	} else {
+		/* For DP, use values from DSC_SLICE_CAP_1 and DSC_SLICE_CAP2 */
+		u8 slice_cap2 = dsc_dpcd[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT];
+
+		if (slice_cap2 & DP_DSC_24_PER_DP_DSC_SINK)
+			return 24;
+		if (slice_cap2 & DP_DSC_20_PER_DP_DSC_SINK)
+			return 20;
+		if (slice_cap2 & DP_DSC_16_PER_DP_DSC_SINK)
+			return 16;
+		if (slice_cap1 & DP_DSC_12_PER_DP_DSC_SINK)
+			return 12;
+		if (slice_cap1 & DP_DSC_10_PER_DP_DSC_SINK)
+			return 10;
+		if (slice_cap1 & DP_DSC_8_PER_DP_DSC_SINK)
+			return 8;
+		if (slice_cap1 & DP_DSC_6_PER_DP_DSC_SINK)
+			return 6;
+		if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
+			return 4;
+		if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
+			return 2;
+		if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
+			return 1;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_dp_dsc_sink_max_slice_count);
+
+u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
+{
+	u8 line_buf_depth = dsc_dpcd[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT];
+
+	switch (line_buf_depth & DP_DSC_LINE_BUF_BIT_DEPTH_MASK) {
+	case DP_DSC_LINE_BUF_BIT_DEPTH_9:
+		return 9;
+	case DP_DSC_LINE_BUF_BIT_DEPTH_10:
+		return 10;
+	case DP_DSC_LINE_BUF_BIT_DEPTH_11:
+		return 11;
+	case DP_DSC_LINE_BUF_BIT_DEPTH_12:
+		return 12;
+	case DP_DSC_LINE_BUF_BIT_DEPTH_13:
+		return 13;
+	case DP_DSC_LINE_BUF_BIT_DEPTH_14:
+		return 14;
+	case DP_DSC_LINE_BUF_BIT_DEPTH_15:
+		return 15;
+	case DP_DSC_LINE_BUF_BIT_DEPTH_16:
+		return 16;
+	case DP_DSC_LINE_BUF_BIT_DEPTH_8:
+		return 8;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_dp_dsc_sink_line_buf_depth);
+
+u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
+{
+	u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
+
+	if (color_depth & DP_DSC_12_BPC)
+		return 12;
+	if (color_depth & DP_DSC_10_BPC)
+		return 10;
+	if (color_depth & DP_DSC_8_BPC)
+		return 8;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_dp_dsc_sink_max_color_depth);
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index dd33d59739f8..7f7f5b965466 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1067,6 +1067,36 @@ drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
 	return dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT;
 }
 
+/* DP/eDP DSC support */
+u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
+				   bool is_edp);
+u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]);
+u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE]);
+
+static inline bool
+drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
+{
+	return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] &
+		DP_DSC_DECOMPRESSION_IS_SUPPORTED;
+}
+
+static inline u16
+drm_edp_dsc_sink_output_bpp(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
+{
+	return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] |
+		(dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] &
+		 DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK <<
+		 DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT);
+}
+
+static inline u32
+drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
+{
+	/* Max Slicewidth = Number of Pixels * 320 */
+	return dsc_dpcd[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] *
+		DP_DSC_SLICE_WIDTH_MULTIPLIER;
+}
+
 /*
  * DisplayPort AUX channel
  */
-- 
2.18.0

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Re: [Intel-gfx] [PATCH v6 04/28] drm/dp: DRM DP helper/macros to get DP sink DSC parameters

[Daniel Vetter]

On Wed, Oct 24, 2018 at 03:28:16PM -0700, Manasi Navare wrote:
> This patch adds inline functions and helpers for obtaining
> DP sink's supported DSC parameters like DSC sink support,
> eDP compressed BPP supported, maximum slice count supported
> by the sink devices, DSC line buffer bit depth supported on DP sink,
> DSC sink maximum color depth by parsing corresponding DPCD registers.
> 
> v4:
> * Add helper to give line buf bit depth (Manasi)
> * Correct the bit masking in color depth helper (manasi)
> v3:
> * Use SLICE_CAP_2 for DP (Anusha)
> v2:
> * Add DSC sink support macro (Jani N)
> 
> Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> Cc: dri-devel@lists.freedesktop.org
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Reviewed-by: Gaurav K Singh <gaurav.k.singh@intel.com>
> ---
>  drivers/gpu/drm/drm_dp_helper.c | 90 +++++++++++++++++++++++++++++++++
>  include/drm/drm_dp_helper.h     | 30 +++++++++++
>  2 files changed, 120 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index 37c01b6076ec..6d483487f2b4 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -1352,3 +1352,93 @@ int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
>  	return 0;
>  }
>  EXPORT_SYMBOL(drm_dp_read_desc);
> +
> +/**
> + * DRM DP Helpers for DSC
> + */

This isn't really kerneldoc. Can you pls fix it, including all the other
new exported functions?

Thanks, Daniel

> +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> +				   bool is_edp)
> +{
> +	u8 slice_cap1 = dsc_dpcd[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
> +
> +	if (is_edp) {
> +		/* For eDP, register DSC_SLICE_CAPABILITIES_1 gives slice count */
> +		if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> +			return 4;
> +		if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> +			return 2;
> +		if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> +			return 1;
> +	} else {
> +		/* For DP, use values from DSC_SLICE_CAP_1 and DSC_SLICE_CAP2 */
> +		u8 slice_cap2 = dsc_dpcd[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT];
> +
> +		if (slice_cap2 & DP_DSC_24_PER_DP_DSC_SINK)
> +			return 24;
> +		if (slice_cap2 & DP_DSC_20_PER_DP_DSC_SINK)
> +			return 20;
> +		if (slice_cap2 & DP_DSC_16_PER_DP_DSC_SINK)
> +			return 16;
> +		if (slice_cap1 & DP_DSC_12_PER_DP_DSC_SINK)
> +			return 12;
> +		if (slice_cap1 & DP_DSC_10_PER_DP_DSC_SINK)
> +			return 10;
> +		if (slice_cap1 & DP_DSC_8_PER_DP_DSC_SINK)
> +			return 8;
> +		if (slice_cap1 & DP_DSC_6_PER_DP_DSC_SINK)
> +			return 6;
> +		if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> +			return 4;
> +		if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> +			return 2;
> +		if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> +			return 1;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_dp_dsc_sink_max_slice_count);
> +
> +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> +{
> +	u8 line_buf_depth = dsc_dpcd[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT];
> +
> +	switch (line_buf_depth & DP_DSC_LINE_BUF_BIT_DEPTH_MASK) {
> +	case DP_DSC_LINE_BUF_BIT_DEPTH_9:
> +		return 9;
> +	case DP_DSC_LINE_BUF_BIT_DEPTH_10:
> +		return 10;
> +	case DP_DSC_LINE_BUF_BIT_DEPTH_11:
> +		return 11;
> +	case DP_DSC_LINE_BUF_BIT_DEPTH_12:
> +		return 12;
> +	case DP_DSC_LINE_BUF_BIT_DEPTH_13:
> +		return 13;
> +	case DP_DSC_LINE_BUF_BIT_DEPTH_14:
> +		return 14;
> +	case DP_DSC_LINE_BUF_BIT_DEPTH_15:
> +		return 15;
> +	case DP_DSC_LINE_BUF_BIT_DEPTH_16:
> +		return 16;
> +	case DP_DSC_LINE_BUF_BIT_DEPTH_8:
> +		return 8;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_dp_dsc_sink_line_buf_depth);
> +
> +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> +{
> +	u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
> +
> +	if (color_depth & DP_DSC_12_BPC)
> +		return 12;
> +	if (color_depth & DP_DSC_10_BPC)
> +		return 10;
> +	if (color_depth & DP_DSC_8_BPC)
> +		return 8;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_dp_dsc_sink_max_color_depth);
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index dd33d59739f8..7f7f5b965466 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -1067,6 +1067,36 @@ drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
>  	return dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT;
>  }
>  
> +/* DP/eDP DSC support */
> +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> +				   bool is_edp);
> +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]);
> +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE]);
> +
> +static inline bool
> +drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> +{
> +	return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] &
> +		DP_DSC_DECOMPRESSION_IS_SUPPORTED;
> +}
> +
> +static inline u16
> +drm_edp_dsc_sink_output_bpp(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> +{
> +	return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] |
> +		(dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] &
> +		 DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK <<
> +		 DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT);
> +}
> +
> +static inline u32
> +drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> +{
> +	/* Max Slicewidth = Number of Pixels * 320 */
> +	return dsc_dpcd[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] *
> +		DP_DSC_SLICE_WIDTH_MULTIPLIER;
> +}
> +
>  /*
>   * DisplayPort AUX channel
>   */
> -- 
> 2.18.0
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH v6 04/28] drm/dp: DRM DP helper/macros to get DP sink DSC parameters

[Daniel Vetter]

On Wed, Dec 19, 2018 at 7:54 PM Daniel Vetter <daniel@ffwll.ch> wrote:
>
> On Wed, Oct 24, 2018 at 03:28:16PM -0700, Manasi Navare wrote:
> > This patch adds inline functions and helpers for obtaining
> > DP sink's supported DSC parameters like DSC sink support,
> > eDP compressed BPP supported, maximum slice count supported
> > by the sink devices, DSC line buffer bit depth supported on DP sink,
> > DSC sink maximum color depth by parsing corresponding DPCD registers.
> >
> > v4:
> > * Add helper to give line buf bit depth (Manasi)
> > * Correct the bit masking in color depth helper (manasi)
> > v3:
> > * Use SLICE_CAP_2 for DP (Anusha)
> > v2:
> > * Add DSC sink support macro (Jani N)
> >
> > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > Cc: dri-devel@lists.freedesktop.org
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Reviewed-by: Gaurav K Singh <gaurav.k.singh@intel.com>
> > ---
> >  drivers/gpu/drm/drm_dp_helper.c | 90 +++++++++++++++++++++++++++++++++
> >  include/drm/drm_dp_helper.h     | 30 +++++++++++
> >  2 files changed, 120 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> > index 37c01b6076ec..6d483487f2b4 100644
> > --- a/drivers/gpu/drm/drm_dp_helper.c
> > +++ b/drivers/gpu/drm/drm_dp_helper.c
> > @@ -1352,3 +1352,93 @@ int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
> >       return 0;
> >  }
> >  EXPORT_SYMBOL(drm_dp_read_desc);
> > +
> > +/**
> > + * DRM DP Helpers for DSC
> > + */
>
> This isn't really kerneldoc. Can you pls fix it, including all the other
> new exported functions?

Ping. Still not fixed, and it's well over one month now. Would be nice
to get this sorted. I'd type the docs myself, but I don't really have
an idea about DSC.

Thanks, Daniel

>
> Thanks, Daniel
>
> > +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> > +                                bool is_edp)
> > +{
> > +     u8 slice_cap1 = dsc_dpcd[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
> > +
> > +     if (is_edp) {
> > +             /* For eDP, register DSC_SLICE_CAPABILITIES_1 gives slice count */
> > +             if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> > +                     return 4;
> > +             if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> > +                     return 2;
> > +             if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> > +                     return 1;
> > +     } else {
> > +             /* For DP, use values from DSC_SLICE_CAP_1 and DSC_SLICE_CAP2 */
> > +             u8 slice_cap2 = dsc_dpcd[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT];
> > +
> > +             if (slice_cap2 & DP_DSC_24_PER_DP_DSC_SINK)
> > +                     return 24;
> > +             if (slice_cap2 & DP_DSC_20_PER_DP_DSC_SINK)
> > +                     return 20;
> > +             if (slice_cap2 & DP_DSC_16_PER_DP_DSC_SINK)
> > +                     return 16;
> > +             if (slice_cap1 & DP_DSC_12_PER_DP_DSC_SINK)
> > +                     return 12;
> > +             if (slice_cap1 & DP_DSC_10_PER_DP_DSC_SINK)
> > +                     return 10;
> > +             if (slice_cap1 & DP_DSC_8_PER_DP_DSC_SINK)
> > +                     return 8;
> > +             if (slice_cap1 & DP_DSC_6_PER_DP_DSC_SINK)
> > +                     return 6;
> > +             if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> > +                     return 4;
> > +             if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> > +                     return 2;
> > +             if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> > +                     return 1;
> > +     }
> > +
> > +     return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_dsc_sink_max_slice_count);
> > +
> > +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > +{
> > +     u8 line_buf_depth = dsc_dpcd[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT];
> > +
> > +     switch (line_buf_depth & DP_DSC_LINE_BUF_BIT_DEPTH_MASK) {
> > +     case DP_DSC_LINE_BUF_BIT_DEPTH_9:
> > +             return 9;
> > +     case DP_DSC_LINE_BUF_BIT_DEPTH_10:
> > +             return 10;
> > +     case DP_DSC_LINE_BUF_BIT_DEPTH_11:
> > +             return 11;
> > +     case DP_DSC_LINE_BUF_BIT_DEPTH_12:
> > +             return 12;
> > +     case DP_DSC_LINE_BUF_BIT_DEPTH_13:
> > +             return 13;
> > +     case DP_DSC_LINE_BUF_BIT_DEPTH_14:
> > +             return 14;
> > +     case DP_DSC_LINE_BUF_BIT_DEPTH_15:
> > +             return 15;
> > +     case DP_DSC_LINE_BUF_BIT_DEPTH_16:
> > +             return 16;
> > +     case DP_DSC_LINE_BUF_BIT_DEPTH_8:
> > +             return 8;
> > +     }
> > +
> > +     return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_dsc_sink_line_buf_depth);
> > +
> > +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > +{
> > +     u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
> > +
> > +     if (color_depth & DP_DSC_12_BPC)
> > +             return 12;
> > +     if (color_depth & DP_DSC_10_BPC)
> > +             return 10;
> > +     if (color_depth & DP_DSC_8_BPC)
> > +             return 8;
> > +
> > +     return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_dsc_sink_max_color_depth);
> > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> > index dd33d59739f8..7f7f5b965466 100644
> > --- a/include/drm/drm_dp_helper.h
> > +++ b/include/drm/drm_dp_helper.h
> > @@ -1067,6 +1067,36 @@ drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> >       return dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT;
> >  }
> >
> > +/* DP/eDP DSC support */
> > +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> > +                                bool is_edp);
> > +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]);
> > +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE]);
> > +
> > +static inline bool
> > +drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > +{
> > +     return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] &
> > +             DP_DSC_DECOMPRESSION_IS_SUPPORTED;
> > +}
> > +
> > +static inline u16
> > +drm_edp_dsc_sink_output_bpp(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > +{
> > +     return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] |
> > +             (dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] &
> > +              DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK <<
> > +              DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT);
> > +}
> > +
> > +static inline u32
> > +drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > +{
> > +     /* Max Slicewidth = Number of Pixels * 320 */
> > +     return dsc_dpcd[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] *
> > +             DP_DSC_SLICE_WIDTH_MULTIPLIER;
> > +}
> > +
> >  /*
> >   * DisplayPort AUX channel
> >   */
> > --
> > 2.18.0
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch



-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH v6 04/28] drm/dp: DRM DP helper/macros to get DP sink DSC parameters

[Sean Paul]

On Wed, Jan 30, 2019 at 12:06:45PM +0100, Daniel Vetter wrote:
> On Wed, Dec 19, 2018 at 7:54 PM Daniel Vetter <daniel@ffwll.ch> wrote:
> >
> > On Wed, Oct 24, 2018 at 03:28:16PM -0700, Manasi Navare wrote:
> > > This patch adds inline functions and helpers for obtaining
> > > DP sink's supported DSC parameters like DSC sink support,
> > > eDP compressed BPP supported, maximum slice count supported
> > > by the sink devices, DSC line buffer bit depth supported on DP sink,
> > > DSC sink maximum color depth by parsing corresponding DPCD registers.
> > >
> > > v4:
> > > * Add helper to give line buf bit depth (Manasi)
> > > * Correct the bit masking in color depth helper (manasi)
> > > v3:
> > > * Use SLICE_CAP_2 for DP (Anusha)
> > > v2:
> > > * Add DSC sink support macro (Jani N)
> > >
> > > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > > Cc: dri-devel@lists.freedesktop.org
> > > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Reviewed-by: Gaurav K Singh <gaurav.k.singh@intel.com>
> > > ---
> > >  drivers/gpu/drm/drm_dp_helper.c | 90 +++++++++++++++++++++++++++++++++
> > >  include/drm/drm_dp_helper.h     | 30 +++++++++++
> > >  2 files changed, 120 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> > > index 37c01b6076ec..6d483487f2b4 100644
> > > --- a/drivers/gpu/drm/drm_dp_helper.c
> > > +++ b/drivers/gpu/drm/drm_dp_helper.c
> > > @@ -1352,3 +1352,93 @@ int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
> > >       return 0;
> > >  }
> > >  EXPORT_SYMBOL(drm_dp_read_desc);
> > > +
> > > +/**
> > > + * DRM DP Helpers for DSC
> > > + */
> >
> > This isn't really kerneldoc. Can you pls fix it, including all the other
> > new exported functions?
> 
> Ping. Still not fixed, and it's well over one month now. Would be nice
> to get this sorted. I'd type the docs myself, but I don't really have
> an idea about DSC.
> 

Ha, this is good timing, I just stumbled over the following htmldocs warnings:
../drivers/gpu/drm/drm_dp_helper.c:1368: warning: Function parameter or member 'dsc_dpcd' not described in 'drm_dp_dsc_sink_max_slice_count'
../drivers/gpu/drm/drm_dp_helper.c:1368: warning: Function parameter or member 'is_edp' not described in 'drm_dp_dsc_sink_max_slice_count'

I tried to add them, but there's a lot of dsc functions that need docs and I
don't have the time/energy to document them properly.

So, I'll echo Daniel's request.

Sean

> Thanks, Daniel
> 
> >
> > Thanks, Daniel
> >
> > > +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> > > +                                bool is_edp)
> > > +{
> > > +     u8 slice_cap1 = dsc_dpcd[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
> > > +
> > > +     if (is_edp) {
> > > +             /* For eDP, register DSC_SLICE_CAPABILITIES_1 gives slice count */
> > > +             if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> > > +                     return 4;
> > > +             if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> > > +                     return 2;
> > > +             if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> > > +                     return 1;
> > > +     } else {
> > > +             /* For DP, use values from DSC_SLICE_CAP_1 and DSC_SLICE_CAP2 */
> > > +             u8 slice_cap2 = dsc_dpcd[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT];
> > > +
> > > +             if (slice_cap2 & DP_DSC_24_PER_DP_DSC_SINK)
> > > +                     return 24;
> > > +             if (slice_cap2 & DP_DSC_20_PER_DP_DSC_SINK)
> > > +                     return 20;
> > > +             if (slice_cap2 & DP_DSC_16_PER_DP_DSC_SINK)
> > > +                     return 16;
> > > +             if (slice_cap1 & DP_DSC_12_PER_DP_DSC_SINK)
> > > +                     return 12;
> > > +             if (slice_cap1 & DP_DSC_10_PER_DP_DSC_SINK)
> > > +                     return 10;
> > > +             if (slice_cap1 & DP_DSC_8_PER_DP_DSC_SINK)
> > > +                     return 8;
> > > +             if (slice_cap1 & DP_DSC_6_PER_DP_DSC_SINK)
> > > +                     return 6;
> > > +             if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> > > +                     return 4;
> > > +             if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> > > +                     return 2;
> > > +             if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> > > +                     return 1;
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > > +EXPORT_SYMBOL(drm_dp_dsc_sink_max_slice_count);
> > > +
> > > +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > +{
> > > +     u8 line_buf_depth = dsc_dpcd[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT];
> > > +
> > > +     switch (line_buf_depth & DP_DSC_LINE_BUF_BIT_DEPTH_MASK) {
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_9:
> > > +             return 9;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_10:
> > > +             return 10;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_11:
> > > +             return 11;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_12:
> > > +             return 12;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_13:
> > > +             return 13;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_14:
> > > +             return 14;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_15:
> > > +             return 15;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_16:
> > > +             return 16;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_8:
> > > +             return 8;
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > > +EXPORT_SYMBOL(drm_dp_dsc_sink_line_buf_depth);
> > > +
> > > +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > +{
> > > +     u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
> > > +
> > > +     if (color_depth & DP_DSC_12_BPC)
> > > +             return 12;
> > > +     if (color_depth & DP_DSC_10_BPC)
> > > +             return 10;
> > > +     if (color_depth & DP_DSC_8_BPC)
> > > +             return 8;
> > > +
> > > +     return 0;
> > > +}
> > > +EXPORT_SYMBOL(drm_dp_dsc_sink_max_color_depth);
> > > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> > > index dd33d59739f8..7f7f5b965466 100644
> > > --- a/include/drm/drm_dp_helper.h
> > > +++ b/include/drm/drm_dp_helper.h
> > > @@ -1067,6 +1067,36 @@ drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> > >       return dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT;
> > >  }
> > >
> > > +/* DP/eDP DSC support */
> > > +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> > > +                                bool is_edp);
> > > +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]);
> > > +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE]);
> > > +
> > > +static inline bool
> > > +drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > +{
> > > +     return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] &
> > > +             DP_DSC_DECOMPRESSION_IS_SUPPORTED;
> > > +}
> > > +
> > > +static inline u16
> > > +drm_edp_dsc_sink_output_bpp(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > +{
> > > +     return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] |
> > > +             (dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] &
> > > +              DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK <<
> > > +              DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT);
> > > +}
> > > +
> > > +static inline u32
> > > +drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > +{
> > > +     /* Max Slicewidth = Number of Pixels * 320 */
> > > +     return dsc_dpcd[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] *
> > > +             DP_DSC_SLICE_WIDTH_MULTIPLIER;
> > > +}
> > > +
> > >  /*
> > >   * DisplayPort AUX channel
> > >   */
> > > --
> > > 2.18.0
> > >
> > > _______________________________________________
> > > Intel-gfx mailing list
> > > Intel-gfx@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> >
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch
> 
> 
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Sean Paul, Software Engineer, Google / Chromium OS
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH v6 04/28] drm/dp: DRM DP helper/macros to get DP sink DSC parameters

[Manasi Navare]

On Wed, Jan 30, 2019 at 01:06:57PM -0500, Sean Paul wrote:
> On Wed, Jan 30, 2019 at 12:06:45PM +0100, Daniel Vetter wrote:
> > On Wed, Dec 19, 2018 at 7:54 PM Daniel Vetter <daniel@ffwll.ch> wrote:
> > >
> > > On Wed, Oct 24, 2018 at 03:28:16PM -0700, Manasi Navare wrote:
> > > > This patch adds inline functions and helpers for obtaining
> > > > DP sink's supported DSC parameters like DSC sink support,
> > > > eDP compressed BPP supported, maximum slice count supported
> > > > by the sink devices, DSC line buffer bit depth supported on DP sink,
> > > > DSC sink maximum color depth by parsing corresponding DPCD registers.
> > > >
> > > > v4:
> > > > * Add helper to give line buf bit depth (Manasi)
> > > > * Correct the bit masking in color depth helper (manasi)
> > > > v3:
> > > > * Use SLICE_CAP_2 for DP (Anusha)
> > > > v2:
> > > > * Add DSC sink support macro (Jani N)
> > > >
> > > > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > > > Cc: dri-devel@lists.freedesktop.org
> > > > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > > > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > > > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > > > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > > Reviewed-by: Gaurav K Singh <gaurav.k.singh@intel.com>
> > > > ---
> > > >  drivers/gpu/drm/drm_dp_helper.c | 90 +++++++++++++++++++++++++++++++++
> > > >  include/drm/drm_dp_helper.h     | 30 +++++++++++
> > > >  2 files changed, 120 insertions(+)
> > > >
> > > > diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> > > > index 37c01b6076ec..6d483487f2b4 100644
> > > > --- a/drivers/gpu/drm/drm_dp_helper.c
> > > > +++ b/drivers/gpu/drm/drm_dp_helper.c
> > > > @@ -1352,3 +1352,93 @@ int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
> > > >       return 0;
> > > >  }
> > > >  EXPORT_SYMBOL(drm_dp_read_desc);
> > > > +
> > > > +/**
> > > > + * DRM DP Helpers for DSC
> > > > + */
> > >
> > > This isn't really kerneldoc. Can you pls fix it, including all the other
> > > new exported functions?
> > 
> > Ping. Still not fixed, and it's well over one month now. Would be nice
> > to get this sorted. I'd type the docs myself, but I don't really have
> > an idea about DSC.
> > 
> 
> Ha, this is good timing, I just stumbled over the following htmldocs warnings:
> ../drivers/gpu/drm/drm_dp_helper.c:1368: warning: Function parameter or member 'dsc_dpcd' not described in 'drm_dp_dsc_sink_max_slice_count'
> ../drivers/gpu/drm/drm_dp_helper.c:1368: warning: Function parameter or member 'is_edp' not described in 'drm_dp_dsc_sink_max_slice_count'
> 
> I tried to add them, but there's a lot of dsc functions that need docs and I
> don't have the time/energy to document them properly.
> 
> So, I'll echo Daniel's request.
> 
> Sean
>

Thanks Sean, I will update the kernel doc for these dsc helpers in drm_dp_helpers.c as well.

Regards
Manasi
 
> > Thanks, Daniel
> > 
> > >
> > > Thanks, Daniel
> > >
> > > > +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> > > > +                                bool is_edp)
> > > > +{
> > > > +     u8 slice_cap1 = dsc_dpcd[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
> > > > +
> > > > +     if (is_edp) {
> > > > +             /* For eDP, register DSC_SLICE_CAPABILITIES_1 gives slice count */
> > > > +             if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> > > > +                     return 4;
> > > > +             if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> > > > +                     return 2;
> > > > +             if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> > > > +                     return 1;
> > > > +     } else {
> > > > +             /* For DP, use values from DSC_SLICE_CAP_1 and DSC_SLICE_CAP2 */
> > > > +             u8 slice_cap2 = dsc_dpcd[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT];
> > > > +
> > > > +             if (slice_cap2 & DP_DSC_24_PER_DP_DSC_SINK)
> > > > +                     return 24;
> > > > +             if (slice_cap2 & DP_DSC_20_PER_DP_DSC_SINK)
> > > > +                     return 20;
> > > > +             if (slice_cap2 & DP_DSC_16_PER_DP_DSC_SINK)
> > > > +                     return 16;
> > > > +             if (slice_cap1 & DP_DSC_12_PER_DP_DSC_SINK)
> > > > +                     return 12;
> > > > +             if (slice_cap1 & DP_DSC_10_PER_DP_DSC_SINK)
> > > > +                     return 10;
> > > > +             if (slice_cap1 & DP_DSC_8_PER_DP_DSC_SINK)
> > > > +                     return 8;
> > > > +             if (slice_cap1 & DP_DSC_6_PER_DP_DSC_SINK)
> > > > +                     return 6;
> > > > +             if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> > > > +                     return 4;
> > > > +             if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> > > > +                     return 2;
> > > > +             if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> > > > +                     return 1;
> > > > +     }
> > > > +
> > > > +     return 0;
> > > > +}
> > > > +EXPORT_SYMBOL(drm_dp_dsc_sink_max_slice_count);
> > > > +
> > > > +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > > +{
> > > > +     u8 line_buf_depth = dsc_dpcd[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT];
> > > > +
> > > > +     switch (line_buf_depth & DP_DSC_LINE_BUF_BIT_DEPTH_MASK) {
> > > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_9:
> > > > +             return 9;
> > > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_10:
> > > > +             return 10;
> > > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_11:
> > > > +             return 11;
> > > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_12:
> > > > +             return 12;
> > > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_13:
> > > > +             return 13;
> > > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_14:
> > > > +             return 14;
> > > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_15:
> > > > +             return 15;
> > > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_16:
> > > > +             return 16;
> > > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_8:
> > > > +             return 8;
> > > > +     }
> > > > +
> > > > +     return 0;
> > > > +}
> > > > +EXPORT_SYMBOL(drm_dp_dsc_sink_line_buf_depth);
> > > > +
> > > > +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > > +{
> > > > +     u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
> > > > +
> > > > +     if (color_depth & DP_DSC_12_BPC)
> > > > +             return 12;
> > > > +     if (color_depth & DP_DSC_10_BPC)
> > > > +             return 10;
> > > > +     if (color_depth & DP_DSC_8_BPC)
> > > > +             return 8;
> > > > +
> > > > +     return 0;
> > > > +}
> > > > +EXPORT_SYMBOL(drm_dp_dsc_sink_max_color_depth);
> > > > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> > > > index dd33d59739f8..7f7f5b965466 100644
> > > > --- a/include/drm/drm_dp_helper.h
> > > > +++ b/include/drm/drm_dp_helper.h
> > > > @@ -1067,6 +1067,36 @@ drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> > > >       return dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT;
> > > >  }
> > > >
> > > > +/* DP/eDP DSC support */
> > > > +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> > > > +                                bool is_edp);
> > > > +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]);
> > > > +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE]);
> > > > +
> > > > +static inline bool
> > > > +drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > > +{
> > > > +     return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] &
> > > > +             DP_DSC_DECOMPRESSION_IS_SUPPORTED;
> > > > +}
> > > > +
> > > > +static inline u16
> > > > +drm_edp_dsc_sink_output_bpp(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > > +{
> > > > +     return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] |
> > > > +             (dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] &
> > > > +              DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK <<
> > > > +              DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT);
> > > > +}
> > > > +
> > > > +static inline u32
> > > > +drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > > +{
> > > > +     /* Max Slicewidth = Number of Pixels * 320 */
> > > > +     return dsc_dpcd[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] *
> > > > +             DP_DSC_SLICE_WIDTH_MULTIPLIER;
> > > > +}
> > > > +
> > > >  /*
> > > >   * DisplayPort AUX channel
> > > >   */
> > > > --
> > > > 2.18.0
> > > >
> > > > _______________________________________________
> > > > Intel-gfx mailing list
> > > > Intel-gfx@lists.freedesktop.org
> > > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > >
> > > --
> > > Daniel Vetter
> > > Software Engineer, Intel Corporation
> > > http://blog.ffwll.ch
> > 
> > 
> > 
> > -- 
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > +41 (0) 79 365 57 48 - http://blog.ffwll.ch
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Sean Paul, Software Engineer, Google / Chromium OS
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH v6 04/28] drm/dp: DRM DP helper/macros to get DP sink DSC parameters

[Manasi Navare]

On Wed, Jan 30, 2019 at 12:06:45PM +0100, Daniel Vetter wrote:
> On Wed, Dec 19, 2018 at 7:54 PM Daniel Vetter <daniel@ffwll.ch> wrote:
> >
> > On Wed, Oct 24, 2018 at 03:28:16PM -0700, Manasi Navare wrote:
> > > This patch adds inline functions and helpers for obtaining
> > > DP sink's supported DSC parameters like DSC sink support,
> > > eDP compressed BPP supported, maximum slice count supported
> > > by the sink devices, DSC line buffer bit depth supported on DP sink,
> > > DSC sink maximum color depth by parsing corresponding DPCD registers.
> > >
> > > v4:
> > > * Add helper to give line buf bit depth (Manasi)
> > > * Correct the bit masking in color depth helper (manasi)
> > > v3:
> > > * Use SLICE_CAP_2 for DP (Anusha)
> > > v2:
> > > * Add DSC sink support macro (Jani N)
> > >
> > > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > > Cc: dri-devel@lists.freedesktop.org
> > > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Reviewed-by: Gaurav K Singh <gaurav.k.singh@intel.com>
> > > ---
> > >  drivers/gpu/drm/drm_dp_helper.c | 90 +++++++++++++++++++++++++++++++++
> > >  include/drm/drm_dp_helper.h     | 30 +++++++++++
> > >  2 files changed, 120 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> > > index 37c01b6076ec..6d483487f2b4 100644
> > > --- a/drivers/gpu/drm/drm_dp_helper.c
> > > +++ b/drivers/gpu/drm/drm_dp_helper.c
> > > @@ -1352,3 +1352,93 @@ int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
> > >       return 0;
> > >  }
> > >  EXPORT_SYMBOL(drm_dp_read_desc);
> > > +
> > > +/**
> > > + * DRM DP Helpers for DSC
> > > + */
> >
> > This isn't really kerneldoc. Can you pls fix it, including all the other
> > new exported functions?
> 
> Ping. Still not fixed, and it's well over one month now. Would be nice
> to get this sorted. I'd type the docs myself, but I don't really have
> an idea about DSC.
> 
> Thanks, Daniel
>

Thanks Daniel for pointing this out. Yes I will add the description for the DSC kernel doc
for each of these helper functions. On it, thanks again and sorry for the delay.

Regards
Manasi
 
> >
> > Thanks, Daniel
> >
> > > +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> > > +                                bool is_edp)
> > > +{
> > > +     u8 slice_cap1 = dsc_dpcd[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
> > > +
> > > +     if (is_edp) {
> > > +             /* For eDP, register DSC_SLICE_CAPABILITIES_1 gives slice count */
> > > +             if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> > > +                     return 4;
> > > +             if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> > > +                     return 2;
> > > +             if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> > > +                     return 1;
> > > +     } else {
> > > +             /* For DP, use values from DSC_SLICE_CAP_1 and DSC_SLICE_CAP2 */
> > > +             u8 slice_cap2 = dsc_dpcd[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT];
> > > +
> > > +             if (slice_cap2 & DP_DSC_24_PER_DP_DSC_SINK)
> > > +                     return 24;
> > > +             if (slice_cap2 & DP_DSC_20_PER_DP_DSC_SINK)
> > > +                     return 20;
> > > +             if (slice_cap2 & DP_DSC_16_PER_DP_DSC_SINK)
> > > +                     return 16;
> > > +             if (slice_cap1 & DP_DSC_12_PER_DP_DSC_SINK)
> > > +                     return 12;
> > > +             if (slice_cap1 & DP_DSC_10_PER_DP_DSC_SINK)
> > > +                     return 10;
> > > +             if (slice_cap1 & DP_DSC_8_PER_DP_DSC_SINK)
> > > +                     return 8;
> > > +             if (slice_cap1 & DP_DSC_6_PER_DP_DSC_SINK)
> > > +                     return 6;
> > > +             if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> > > +                     return 4;
> > > +             if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> > > +                     return 2;
> > > +             if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> > > +                     return 1;
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > > +EXPORT_SYMBOL(drm_dp_dsc_sink_max_slice_count);
> > > +
> > > +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > +{
> > > +     u8 line_buf_depth = dsc_dpcd[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT];
> > > +
> > > +     switch (line_buf_depth & DP_DSC_LINE_BUF_BIT_DEPTH_MASK) {
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_9:
> > > +             return 9;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_10:
> > > +             return 10;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_11:
> > > +             return 11;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_12:
> > > +             return 12;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_13:
> > > +             return 13;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_14:
> > > +             return 14;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_15:
> > > +             return 15;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_16:
> > > +             return 16;
> > > +     case DP_DSC_LINE_BUF_BIT_DEPTH_8:
> > > +             return 8;
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > > +EXPORT_SYMBOL(drm_dp_dsc_sink_line_buf_depth);
> > > +
> > > +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > +{
> > > +     u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
> > > +
> > > +     if (color_depth & DP_DSC_12_BPC)
> > > +             return 12;
> > > +     if (color_depth & DP_DSC_10_BPC)
> > > +             return 10;
> > > +     if (color_depth & DP_DSC_8_BPC)
> > > +             return 8;
> > > +
> > > +     return 0;
> > > +}
> > > +EXPORT_SYMBOL(drm_dp_dsc_sink_max_color_depth);
> > > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> > > index dd33d59739f8..7f7f5b965466 100644
> > > --- a/include/drm/drm_dp_helper.h
> > > +++ b/include/drm/drm_dp_helper.h
> > > @@ -1067,6 +1067,36 @@ drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> > >       return dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT;
> > >  }
> > >
> > > +/* DP/eDP DSC support */
> > > +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> > > +                                bool is_edp);
> > > +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]);
> > > +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE]);
> > > +
> > > +static inline bool
> > > +drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > +{
> > > +     return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] &
> > > +             DP_DSC_DECOMPRESSION_IS_SUPPORTED;
> > > +}
> > > +
> > > +static inline u16
> > > +drm_edp_dsc_sink_output_bpp(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > +{
> > > +     return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] |
> > > +             (dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] &
> > > +              DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK <<
> > > +              DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT);
> > > +}
> > > +
> > > +static inline u32
> > > +drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > > +{
> > > +     /* Max Slicewidth = Number of Pixels * 320 */
> > > +     return dsc_dpcd[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] *
> > > +             DP_DSC_SLICE_WIDTH_MULTIPLIER;
> > > +}
> > > +
> > >  /*
> > >   * DisplayPort AUX channel
> > >   */
> > > --
> > > 2.18.0
> > >
> > > _______________________________________________
> > > Intel-gfx mailing list
> > > Intel-gfx@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> >
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch
> 
> 
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
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[PATCH v6 05/28] drm/i915/dp: Add helpers for Compressed BPP and Slice Count for DSC

[Manasi Navare]

This patch adds helpers for calculating the maximum compressed BPP
supported with small joiner.
This also adds a helper for calculating the slice count in case
of small joiner.
These are inside intel_dp since they take into account hardware
limitations.

v6:
* Take mode_clock and mode_hdisplay as input arguments
so that this can be called in intel_dp_mode_valid (Manasi)
v5:
* Get the max slice width from DPCD
* Check against Min_Slice_width of 2560 (Anusha)
v4:
* #defines for PPR in slice count helper (Gaurav)
v3:
* Simply logic for bpp (DK)
* Limit the valid slice count by max supported by Sink (Manasi)
v2:
* Change the small joiner RAM buffer constant as bspec changed (Manasi)
* rename it as SMALL_JOINER since we are not enabling big joiner yet (Anusha)

Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Gaurav K Singh <gaurav.k.singh@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c  | 104 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h |   4 ++
 2 files changed, 108 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 55e070b85c02..8380044affed 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -45,6 +45,17 @@
 
 #define DP_DPRX_ESI_LEN 14
 
+/* DP DSC small joiner has 2 FIFOs each of 640 x 6 bytes */
+#define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
+
+/* DP DSC throughput values used for slice count calculations KPixels/s */
+#define DP_DSC_PEAK_PIXEL_RATE			2720000
+#define DP_DSC_MAX_ENC_THROUGHPUT_0		340000
+#define DP_DSC_MAX_ENC_THROUGHPUT_1		400000
+
+/* DP DSC FEC Overhead factor = (100 - 2.4)/100 */
+#define DP_DSC_FEC_OVERHEAD_FACTOR		976
+
 /* Compliance test status bits  */
 #define INTEL_DP_RESOLUTION_SHIFT_MASK	0
 #define INTEL_DP_RESOLUTION_PREFERRED	(1 << INTEL_DP_RESOLUTION_SHIFT_MASK)
@@ -93,6 +104,14 @@ static const struct dp_link_dpll chv_dpll[] = {
 		{ .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } },
 };
 
+/* Constants for DP DSC configurations */
+static const u8 valid_dsc_bpp[] = {6, 8, 10, 12, 15};
+
+/* With Single pipe configuration, HW is capable of supporting maximum
+ * of 4 slices per line.
+ */
+static const u8 valid_dsc_slicecount[] = {1, 2, 4};
+
 /**
  * intel_dp_is_edp - is the given port attached to an eDP panel (either CPU or PCH)
  * @intel_dp: DP struct
@@ -4162,6 +4181,91 @@ intel_dp_get_sink_irq_esi(struct intel_dp *intel_dp, u8 *sink_irq_vector)
 		DP_DPRX_ESI_LEN;
 }
 
+u16 intel_dp_dsc_get_output_bpp(int link_clock, uint8_t lane_count,
+				int mode_clock, int mode_hdisplay)
+{
+	u16 bits_per_pixel, max_bpp_small_joiner_ram;
+	int i;
+
+	/*
+	 * Available Link Bandwidth(Kbits/sec) = (NumberOfLanes)*
+	 * (LinkSymbolClock)* 8 * ((100-FECOverhead)/100)*(TimeSlotsPerMTP)
+	 * FECOverhead = 2.4%, for SST -> TimeSlotsPerMTP is 1,
+	 * for MST -> TimeSlotsPerMTP has to be calculated
+	 */
+	bits_per_pixel = (link_clock * lane_count * 8 *
+			  DP_DSC_FEC_OVERHEAD_FACTOR) /
+		mode_clock;
+
+	/* Small Joiner Check: output bpp <= joiner RAM (bits) / Horiz. width */
+	max_bpp_small_joiner_ram = DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER /
+		mode_hdisplay;
+
+	/*
+	 * Greatest allowed DSC BPP = MIN (output BPP from avaialble Link BW
+	 * check, output bpp from small joiner RAM check)
+	 */
+	bits_per_pixel = min(bits_per_pixel, max_bpp_small_joiner_ram);
+
+	/* Error out if the max bpp is less than smallest allowed valid bpp */
+	if (bits_per_pixel < valid_dsc_bpp[0]) {
+		DRM_DEBUG_KMS("Unsupported BPP %d\n", bits_per_pixel);
+		return 0;
+	}
+
+	/* Find the nearest match in the array of known BPPs from VESA */
+	for (i = 0; i < ARRAY_SIZE(valid_dsc_bpp) - 1; i++) {
+		if (bits_per_pixel < valid_dsc_bpp[i + 1])
+			break;
+	}
+	bits_per_pixel = valid_dsc_bpp[i];
+
+	/*
+	 * Compressed BPP in U6.4 format so multiply by 16, for Gen 11,
+	 * fractional part is 0
+	 */
+	return bits_per_pixel << 4;
+}
+
+u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp,
+				int mode_clock,
+				int mode_hdisplay)
+{
+	u8 min_slice_count, i;
+	int max_slice_width;
+
+	if (mode_clock <= DP_DSC_PEAK_PIXEL_RATE)
+		min_slice_count = DIV_ROUND_UP(mode_clock,
+					       DP_DSC_MAX_ENC_THROUGHPUT_0);
+	else
+		min_slice_count = DIV_ROUND_UP(mode_clock,
+					       DP_DSC_MAX_ENC_THROUGHPUT_1);
+
+	max_slice_width = drm_dp_dsc_sink_max_slice_width(intel_dp->dsc_dpcd);
+	if (max_slice_width < DP_DSC_MIN_SLICE_WIDTH_VALUE) {
+		DRM_DEBUG_KMS("Unsupported slice width %d by DP DSC Sink device\n",
+			      max_slice_width);
+		return 0;
+	}
+	/* Also take into account max slice width */
+	min_slice_count = min_t(uint8_t, min_slice_count,
+				DIV_ROUND_UP(mode_hdisplay,
+					     max_slice_width));
+
+	/* Find the closest match to the valid slice count values */
+	for (i = 0; i < ARRAY_SIZE(valid_dsc_slicecount); i++) {
+		if (valid_dsc_slicecount[i] >
+		    drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
+						    false))
+			break;
+		if (min_slice_count  <= valid_dsc_slicecount[i])
+			return valid_dsc_slicecount[i];
+	}
+
+	DRM_DEBUG_KMS("Unsupported Slice Count %d\n", min_slice_count);
+	return 0;
+}
+
 static uint8_t intel_dp_autotest_link_training(struct intel_dp *intel_dp)
 {
 	int status = 0;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 4cacf0e3fa17..62c051098859 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1830,6 +1830,10 @@ bool intel_dp_source_supports_hbr2(struct intel_dp *intel_dp);
 bool intel_dp_source_supports_hbr3(struct intel_dp *intel_dp);
 bool
 intel_dp_get_link_status(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE]);
+uint16_t intel_dp_dsc_get_output_bpp(int link_clock, uint8_t lane_count,
+				     int mode_clock, int mode_hdisplay);
+uint8_t intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp, int mode_clock,
+				     int mode_hdisplay);
 
 static inline unsigned int intel_dp_unused_lane_mask(int lane_count)
 {
-- 
2.18.0

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[PATCH v6 06/28] drm/i915/dp: Validate modes using max Output BPP and slice count when DSC supported

[Manasi Navare]

When DSC is supported we need to validate the modes based on the
maximum supported compressed BPP and maximum supported slice count.
This allows us to allow the modes with pixel clock greater than the
available link BW as long as it meets the compressed BPP
and slice count requirements.

v3:
* Use the macro for dsc sink support (Jani N)
v2:
* Properly comment why we are right shifting the bpp value (Anusha)

Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Gaurav K Singh <gaurav.k.singh@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 8380044affed..6f66a38ba0b2 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -635,9 +635,12 @@ intel_dp_mode_valid(struct drm_connector *connector,
 	struct intel_dp *intel_dp = intel_attached_dp(connector);
 	struct intel_connector *intel_connector = to_intel_connector(connector);
 	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
+	struct drm_i915_private *dev_priv = to_i915(connector->dev);
 	int target_clock = mode->clock;
 	int max_rate, mode_rate, max_lanes, max_link_clock;
 	int max_dotclk;
+	u16 dsc_max_output_bpp = 0;
+	u8 dsc_slice_count = 0;
 
 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 		return MODE_NO_DBLESCAN;
@@ -660,7 +663,33 @@ intel_dp_mode_valid(struct drm_connector *connector,
 	max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
 	mode_rate = intel_dp_link_required(target_clock, 18);
 
-	if (mode_rate > max_rate || target_clock > max_dotclk)
+	/*
+	 * Output bpp is stored in 6.4 format so right shift by 4 to get the
+	 * integer value since we support only integer values of bpp.
+	 */
+	if ((INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) &&
+	    drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
+		if (intel_dp_is_edp(intel_dp)) {
+			dsc_max_output_bpp =
+				drm_edp_dsc_sink_output_bpp(intel_dp->dsc_dpcd) >> 4;
+			dsc_slice_count =
+				drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
+								true);
+		} else {
+			dsc_max_output_bpp =
+				intel_dp_dsc_get_output_bpp(max_link_clock,
+							    max_lanes,
+							    target_clock,
+							    mode->hdisplay) >> 4;
+			dsc_slice_count =
+				intel_dp_dsc_get_slice_count(intel_dp,
+							     target_clock,
+							     mode->hdisplay);
+		}
+	}
+
+	if ((mode_rate > max_rate && !(dsc_max_output_bpp && dsc_slice_count)) ||
+	    target_clock > max_dotclk)
 		return MODE_CLOCK_HIGH;
 
 	if (mode->clock < 10000)
-- 
2.18.0

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[PATCH v6 07/28] drm/dp: Define payload size for DP SDP PPS packet

[Manasi Navare]

DP 1.4 spec defines DP secondary data packet for DSC
picture parameter set. This patch defines its payload size
according to the DP 1.4 specification.

Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Cc: dri-devel@lists.freedesktop.org
Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
---
 include/drm/drm_dp_helper.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 7f7f5b965466..730243dd41e2 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1001,6 +1001,7 @@ struct dp_sdp_header {
 
 #define EDP_SDP_HEADER_REVISION_MASK		0x1F
 #define EDP_SDP_HEADER_VALID_PAYLOAD_BYTES	0x1F
+#define DP_SDP_PPS_HEADER_PAYLOAD_BYTES_MINUS_1 0x7F
 
 struct edp_vsc_psr {
 	struct dp_sdp_header sdp_header;
-- 
2.18.0

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[PATCH v6 08/28] drm/dsc: Define Display Stream Compression PPS infoframe

[Manasi Navare]

This patch defines a new header file for all the DSC 1.2 structures
and creates a structure for PPS infoframe which will be used to send
picture parameter set secondary data packet for display stream compression.
All the PPS infoframe syntax elements are taken from DSC 1.2 specification
from VESA.

v3:
* Add the SPDX shorthand (Chris Wilson)
v2:
* Do not use bitfields in the struct (Jani Nikula)

Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Cc: dri-devel@lists.freedesktop.org
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
---
 include/drm/drm_dsc.h | 347 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 347 insertions(+)
 create mode 100644 include/drm/drm_dsc.h

diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
new file mode 100644
index 000000000000..1d8a03983b90
--- /dev/null
+++ b/include/drm/drm_dsc.h
@@ -0,0 +1,347 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (C) 2018 Intel Corp.
+ *
+ * Authors:
+ * Manasi Navare <manasi.d.navare@intel.com>
+ */
+
+#ifndef DRM_DSC_H_
+#define DRM_DSC_H_
+
+#include <drm/drm_dp_helper.h>
+
+/* VESA Display Stream Compression DSC 1.2 constants */
+#define DSC_NUM_BUF_RANGES	15
+
+/**
+ * struct picture_parameter_set - Represents 128 bytes of Picture Parameter Set
+ *
+ * The VESA DSC standard defines picture parameter set (PPS) which display
+ * stream compression encoders must communicate to decoders.
+ * The PPS is encapsulated in 128 bytes (PPS 0 through PPS 127). The fields in
+ * this structure are as per Table 4.1 in Vesa DSC specification v1.1/v1.2.
+ * The PPS fields that span over more than a byte should be stored in Big Endian
+ * format.
+ */
+struct picture_parameter_set {
+	/**
+	 * @dsc_version:
+	 * PPS0[3:0] - dsc_version_minor: Contains Minor version of DSC
+	 * PPS0[7:4] - dsc_version_major: Contains major version of DSC
+	 */
+	u8 dsc_version;
+	/**
+	 * @pps_identifier:
+	 * PPS1[7:0] - Application specific identifier that can be
+	 * used to differentiate between different PPS tables.
+	 */
+	u8 pps_identifier;
+	/**
+	 * @pps_reserved:
+	 * PPS2[7:0]- RESERVED Byte
+	 */
+	u8 pps_reserved;
+	/**
+	 * @pps_3:
+	 * PPS3[3:0] - linebuf_depth: Contains linebuffer bit depth used to
+	 * generate the bitstream. (0x0 - 16 bits for DSC 1.2, 0x8 - 8 bits,
+	 * 0xA - 10 bits, 0xB - 11 bits, 0xC - 12 bits, 0xD - 13 bits,
+	 * 0xE - 14 bits for DSC1.2, 0xF - 14 bits for DSC 1.2.
+	 * PPS3[7:4] - bits_per_component: Bits per component for the original
+	 * pixels of the encoded picture.
+	 * 0x0 = 16bpc (allowed only when dsc_version_minor = 0x2)
+	 * 0x8 = 8bpc, 0xA = 10bpc, 0xC = 12bpc, 0xE = 14bpc (also
+	 * allowed only when dsc_minor_version = 0x2)
+	 */
+	u8 pps_3;
+	/**
+	 * @pps_4:
+	 * PPS4[1:0] -These are the most significant 2 bits of
+	 * compressed BPP bits_per_pixel[9:0] syntax element.
+	 * PPS4[2] - vbr_enable: 0 = VBR disabled, 1 = VBR enabled
+	 * PPS4[3] - simple_422: Indicates if decoder drops samples to
+	 * reconstruct the 4:2:2 picture.
+	 * PPS4[4] - Convert_rgb: Indicates if DSC color space conversion is
+	 * active.
+	 * PPS4[5] - blobk_pred_enable: Indicates if BP is used to code any
+	 * groups in picture
+	 * PPS4[7:6] - Reseved bits
+	 */
+	u8 pps_4;
+	/**
+	 * @bits_per_pixel_low:
+	 * PPS5[7:0] - This indicates the lower significant 8 bits of
+	 * the compressed BPP bits_per_pixel[9:0] element.
+	 */
+	u8 bits_per_pixel_low;
+	/**
+	 * @pic_height:
+	 * PPS6[7:0], PPS7[7:0] -pic_height: Specifies the number of pixel rows
+	 * within the raster.
+	 */
+	__be16 pic_height;
+	/**
+	 * @pic_width:
+	 * PPS8[7:0], PPS9[7:0] - pic_width: Number of pixel columns within
+	 * the raster.
+	 */
+	__be16 pic_width;
+	/**
+	 * @slice_height:
+	 * PPS10[7:0], PPS11[7:0] - Slice height in units of pixels.
+	 */
+	__be16 slice_height;
+	/**
+	 * @slice_width:
+	 * PPS12[7:0], PPS13[7:0] - Slice width in terms of pixels.
+	 */
+	__be16 slice_width;
+	/**
+	 * @chunk_size:
+	 * PPS14[7:0], PPS15[7:0] - Size in units of bytes of the chunks
+	 * that are used for slice multiplexing.
+	 */
+	__be16 chunk_size;
+	/**
+	 * @initial_xmit_delay_high:
+	 * PPS16[1:0] - Most Significant two bits of initial transmission delay.
+	 * It specifies the number of pixel times that the encoder waits before
+	 * transmitting data from its rate buffer.
+	 * PPS16[7:2] - Reserved
+	 */
+	u8 initial_xmit_delay_high;
+	/**
+	 * @initial_xmit_delay_low:
+	 * PPS17[7:0] - Least significant 8 bits of initial transmission delay.
+	 */
+	u8 initial_xmit_delay_low;
+	/**
+	 * @initial_dec_delay:
+	 *
+	 * PPS18[7:0], PPS19[7:0] - Initial decoding delay which is the number
+	 * of pixel times that the decoder accumulates data in its rate buffer
+	 * before starting to decode and output pixels.
+	 */
+	__be16 initial_dec_delay;
+	/**
+	 * @pps20_reserved:
+	 *
+	 * PPS20[7:0] - Reserved
+	 */
+	u8 pps20_reserved;
+	/**
+	 * @initial_scale_value:
+	 * PPS21[5:0] - Initial rcXformScale factor used at beginning
+	 * of a slice.
+	 * PPS21[7:6] - Reserved
+	 */
+	u8 initial_scale_value;
+	/**
+	 * @scale_increment_interval:
+	 * PPS22[7:0], PPS23[7:0] - Number of group times between incrementing
+	 * the rcXformScale factor at end of a slice.
+	 */
+	__be16 scale_increment_interval;
+	/**
+	 * @scale_decrement_interval_high:
+	 * PPS24[3:0] - Higher 4 bits indicating number of group times between
+	 * decrementing the rcXformScale factor at beginning of a slice.
+	 * PPS24[7:4] - Reserved
+	 */
+	u8 scale_decrement_interval_high;
+	/**
+	 * @scale_decrement_interval_low:
+	 * PPS25[7:0] - Lower 8 bits of scale decrement interval
+	 */
+	u8 scale_decrement_interval_low;
+	/**
+	 * @pps26_reserved:
+	 * PPS26[7:0]
+	 */
+	u8 pps26_reserved;
+	/**
+	 * @first_line_bpg_offset:
+	 * PPS27[4:0] - Number of additional bits that are allocated
+	 * for each group on first line of a slice.
+	 * PPS27[7:5] - Reserved
+	 */
+	u8 first_line_bpg_offset;
+	/**
+	 * @nfl_bpg_offset:
+	 * PPS28[7:0], PPS29[7:0] - Number of bits including frac bits
+	 * deallocated for each group for groups after the first line of slice.
+	 */
+	__be16 nfl_bpg_offset;
+	/**
+	 * @slice_bpg_offset:
+	 * PPS30, PPS31[7:0] - Number of bits that are deallocated for each
+	 * group to enforce the slice constraint.
+	 */
+	__be16 slice_bpg_offset;
+	/**
+	 * @initial_offset:
+	 * PPS32,33[7:0] - Initial value for rcXformOffset
+	 */
+	__be16 initial_offset;
+	/**
+	 * @final_offset:
+	 * PPS34,35[7:0] - Maximum end-of-slice value for rcXformOffset
+	 */
+	__be16 final_offset;
+	/**
+	 * @flatness_min_qp:
+	 * PPS36[4:0] - Minimum QP at which flatness is signaled and
+	 * flatness QP adjustment is made.
+	 * PPS36[7:5] - Reserved
+	 */
+	u8 flatness_min_qp;
+	/**
+	 * @flatness_max_qp:
+	 * PPS37[4:0] - Max QP at which flatness is signalled and
+	 * the flatness adjustment is made.
+	 * PPS37[7:5] - Reserved
+	 */
+	u8 flatness_max_qp;
+	/**
+	 * @rc_model_size:
+	 * PPS38,39[7:0] - Number of bits within RC Model.
+	 */
+	__be16 rc_model_size;
+	/**
+	 * @rc_edge_factor:
+	 * PPS40[3:0] - Ratio of current activity vs, previous
+	 * activity to determine presence of edge.
+	 * PPS40[7:4] - Reserved
+	 */
+	u8 rc_edge_factor;
+	/**
+	 * @rc_quant_incr_limit0:
+	 * PPS41[4:0] - QP threshold used in short term RC
+	 * PPS41[7:5] - Reserved
+	 */
+	u8 rc_quant_incr_limit0;
+	/**
+	 * @rc_quant_incr_limit1:
+	 * PPS42[4:0] - QP threshold used in short term RC
+	 * PPS42[7:5] - Reserved
+	 */
+	u8 rc_quant_incr_limit1;
+	/**
+	 * @rc_tgt_offset:
+	 * PPS43[3:0] - Lower end of the variability range around the target
+	 * bits per group that is allowed by short term RC.
+	 * PPS43[7:4]- Upper end of the variability range around the target
+	 * bits per group that i allowed by short term rc.
+	 */
+	u8 rc_tgt_offset;
+	/**
+	 * @rc_buf_thresh:
+	 * PPS44[7:0] - PPS57[7:0] - Specifies the thresholds in RC model for
+	 * the 15 ranges defined by 14 thresholds.
+	 */
+	u8 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1];
+	/**
+	 * @rc_range_parameters:
+	 * PPS58[7:0] - PPS87[7:0]
+	 * Parameters that correspond to each of the 15 ranges.
+	 */
+	__be16 rc_range_parameters[DSC_NUM_BUF_RANGES];
+	/**
+	 * @native_422_420:
+	 * PPS88[0] - 0 = Native 4:2:2 not used
+	 * 1 = Native 4:2:2 used
+	 * PPS88[1] - 0 = Native 4:2:0 not use
+	 * 1 = Native 4:2:0 used
+	 * PPS88[7:2] - Reserved 6 bits
+	 */
+	u8 native_422_420;
+	/**
+	 * @second_line_bpg_offset:
+	 * PPS89[4:0] - Additional bits/group budget for the
+	 * second line of a slice in Native 4:2:0 mode.
+	 * Set to 0 if DSC minor version is 1 or native420 is 0.
+	 * PPS89[7:5] - Reserved
+	 */
+	u8 second_line_bpg_offset;
+	/**
+	 * @nsl_bpg_offset:
+	 * PPS90[7:0], PPS91[7:0] - Number of bits that are deallocated
+	 * for each group that is not in the second line of a slice.
+	 */
+	__be16 nsl_bpg_offset;
+	/**
+	 * @second_line_offset_adj:
+	 * PPS92[7:0], PPS93[7:0] - Used as offset adjustment for the second
+	 * line in Native 4:2:0 mode.
+	 */
+	__be16 second_line_offset_adj;
+	/**
+	 * @pps_long_94_reserved:
+	 * PPS 94, 95, 96, 97 - Reserved
+	 */
+	u32 pps_long_94_reserved;
+	/**
+	 * @pps_long_98_reserved:
+	 * PPS 98, 99, 100, 101 - Reserved
+	 */
+	u32 pps_long_98_reserved;
+	/**
+	 * @pps_long_102_reserved:
+	 * PPS 102, 103, 104, 105 - Reserved
+	 */
+	u32 pps_long_102_reserved;
+	/**
+	 * @pps_long_106_reserved:
+	 * PPS 106, 107, 108, 109 - reserved
+	 */
+	u32 pps_long_106_reserved;
+	/**
+	 * @pps_long_110_reserved:
+	 * PPS 110, 111, 112, 113 - reserved
+	 */
+	u32 pps_long_110_reserved;
+	/**
+	 * @pps_long_114_reserved:
+	 * PPS 114 - 117 - reserved
+	 */
+	u32 pps_long_114_reserved;
+	/**
+	 * @pps_long_118_reserved:
+	 * PPS 118 - 121 - reserved
+	 */
+	u32 pps_long_118_reserved;
+	/**
+	 * @pps_long_122_reserved:
+	 * PPS 122- 125 - reserved
+	 */
+	u32 pps_long_122_reserved;
+	/**
+	 * @pps_short_126_reserved:
+	 * PPS 126, 127 - reserved
+	 */
+	__be16 pps_short_126_reserved;
+};
+
+/**
+ * struct drm_dsc_pps_infoframe - DSC infoframe carrying the Picture Parameter
+ * Set Metadata
+ *
+ * This structure represents the DSC PPS infoframe required to send the Picture
+ * Parameter Set metadata required before enabling VESA Display Stream
+ * Compression. This is based on the DP Secondary Data Packet structure and
+ * comprises of SDP Header as defined in drm_dp_helper.h and PPS payload.
+ *
+ * @pps_header:
+ *
+ * Header for PPS as per DP SDP header format
+ *
+ * @pps_payload:
+ *
+ * PPS payload fields as per DSC specification Table 4-1
+ */
+struct drm_dsc_pps_infoframe {
+	struct dp_sdp_header pps_header;
+	struct picture_parameter_set pps_payload;
+} __packed;
+
+#endif /* _DRM_DSC_H_ */
-- 
2.18.0

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Re: [PATCH v6 08/28] drm/dsc: Define Display Stream Compression PPS infoframe

[Ville Syrjälä]

On Wed, Oct 24, 2018 at 03:28:20PM -0700, Manasi Navare wrote:
> This patch defines a new header file for all the DSC 1.2 structures
> and creates a structure for PPS infoframe which will be used to send
> picture parameter set secondary data packet for display stream compression.
> All the PPS infoframe syntax elements are taken from DSC 1.2 specification
> from VESA.
> 
> v3:
> * Add the SPDX shorthand (Chris Wilson)
> v2:
> * Do not use bitfields in the struct (Jani Nikula)
> 
> Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> Cc: dri-devel@lists.freedesktop.org
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Cc: Harry Wentland <harry.wentland@amd.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Harry Wentland <harry.wentland@amd.com>
> ---
>  include/drm/drm_dsc.h | 347 ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 347 insertions(+)
>  create mode 100644 include/drm/drm_dsc.h
> 
> diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
> new file mode 100644
> index 000000000000..1d8a03983b90
> --- /dev/null
> +++ b/include/drm/drm_dsc.h
> @@ -0,0 +1,347 @@
> +/* SPDX-License-Identifier: MIT
> + * Copyright (C) 2018 Intel Corp.
> + *
> + * Authors:
> + * Manasi Navare <manasi.d.navare@intel.com>
> + */
> +
> +#ifndef DRM_DSC_H_
> +#define DRM_DSC_H_
> +
> +#include <drm/drm_dp_helper.h>
> +
> +/* VESA Display Stream Compression DSC 1.2 constants */
> +#define DSC_NUM_BUF_RANGES	15

DRM_DSC_...  perhasp?

> +
> +/**
> + * struct picture_parameter_set - Represents 128 bytes of Picture Parameter Set
> + *
> + * The VESA DSC standard defines picture parameter set (PPS) which display
> + * stream compression encoders must communicate to decoders.
> + * The PPS is encapsulated in 128 bytes (PPS 0 through PPS 127). The fields in
> + * this structure are as per Table 4.1 in Vesa DSC specification v1.1/v1.2.
> + * The PPS fields that span over more than a byte should be stored in Big Endian
> + * format.
> + */
> +struct picture_parameter_set {

Needs a namespace too. Probably best make this struct packed. A
BUILD_BUG_ON() somewhere to verify the size might also be nice.

> +	/**
> +	 * @dsc_version:
> +	 * PPS0[3:0] - dsc_version_minor: Contains Minor version of DSC
> +	 * PPS0[7:4] - dsc_version_major: Contains major version of DSC
> +	 */
> +	u8 dsc_version;
> +	/**
> +	 * @pps_identifier:
> +	 * PPS1[7:0] - Application specific identifier that can be
> +	 * used to differentiate between different PPS tables.
> +	 */
> +	u8 pps_identifier;
> +	/**
> +	 * @pps_reserved:
> +	 * PPS2[7:0]- RESERVED Byte
> +	 */
> +	u8 pps_reserved;
> +	/**
> +	 * @pps_3:
> +	 * PPS3[3:0] - linebuf_depth: Contains linebuffer bit depth used to
> +	 * generate the bitstream. (0x0 - 16 bits for DSC 1.2, 0x8 - 8 bits,
> +	 * 0xA - 10 bits, 0xB - 11 bits, 0xC - 12 bits, 0xD - 13 bits,
> +	 * 0xE - 14 bits for DSC1.2, 0xF - 14 bits for DSC 1.2.
> +	 * PPS3[7:4] - bits_per_component: Bits per component for the original
> +	 * pixels of the encoded picture.
> +	 * 0x0 = 16bpc (allowed only when dsc_version_minor = 0x2)
> +	 * 0x8 = 8bpc, 0xA = 10bpc, 0xC = 12bpc, 0xE = 14bpc (also
> +	 * allowed only when dsc_minor_version = 0x2)
> +	 */
> +	u8 pps_3;
> +	/**
> +	 * @pps_4:
> +	 * PPS4[1:0] -These are the most significant 2 bits of
> +	 * compressed BPP bits_per_pixel[9:0] syntax element.
> +	 * PPS4[2] - vbr_enable: 0 = VBR disabled, 1 = VBR enabled
> +	 * PPS4[3] - simple_422: Indicates if decoder drops samples to
> +	 * reconstruct the 4:2:2 picture.
> +	 * PPS4[4] - Convert_rgb: Indicates if DSC color space conversion is
> +	 * active.
> +	 * PPS4[5] - blobk_pred_enable: Indicates if BP is used to code any
> +	 * groups in picture
> +	 * PPS4[7:6] - Reseved bits
> +	 */
> +	u8 pps_4;
> +	/**
> +	 * @bits_per_pixel_low:
> +	 * PPS5[7:0] - This indicates the lower significant 8 bits of
> +	 * the compressed BPP bits_per_pixel[9:0] element.
> +	 */
> +	u8 bits_per_pixel_low;
> +	/**
> +	 * @pic_height:
> +	 * PPS6[7:0], PPS7[7:0] -pic_height: Specifies the number of pixel rows
> +	 * within the raster.
> +	 */
> +	__be16 pic_height;
> +	/**
> +	 * @pic_width:
> +	 * PPS8[7:0], PPS9[7:0] - pic_width: Number of pixel columns within
> +	 * the raster.
> +	 */
> +	__be16 pic_width;
> +	/**
> +	 * @slice_height:
> +	 * PPS10[7:0], PPS11[7:0] - Slice height in units of pixels.
> +	 */
> +	__be16 slice_height;
> +	/**
> +	 * @slice_width:
> +	 * PPS12[7:0], PPS13[7:0] - Slice width in terms of pixels.
> +	 */
> +	__be16 slice_width;
> +	/**
> +	 * @chunk_size:
> +	 * PPS14[7:0], PPS15[7:0] - Size in units of bytes of the chunks
> +	 * that are used for slice multiplexing.
> +	 */
> +	__be16 chunk_size;
> +	/**
> +	 * @initial_xmit_delay_high:
> +	 * PPS16[1:0] - Most Significant two bits of initial transmission delay.
> +	 * It specifies the number of pixel times that the encoder waits before
> +	 * transmitting data from its rate buffer.
> +	 * PPS16[7:2] - Reserved
> +	 */
> +	u8 initial_xmit_delay_high;
> +	/**
> +	 * @initial_xmit_delay_low:
> +	 * PPS17[7:0] - Least significant 8 bits of initial transmission delay.
> +	 */
> +	u8 initial_xmit_delay_low;
> +	/**
> +	 * @initial_dec_delay:
> +	 *
> +	 * PPS18[7:0], PPS19[7:0] - Initial decoding delay which is the number
> +	 * of pixel times that the decoder accumulates data in its rate buffer
> +	 * before starting to decode and output pixels.
> +	 */
> +	__be16 initial_dec_delay;
> +	/**
> +	 * @pps20_reserved:
> +	 *
> +	 * PPS20[7:0] - Reserved
> +	 */
> +	u8 pps20_reserved;
> +	/**
> +	 * @initial_scale_value:
> +	 * PPS21[5:0] - Initial rcXformScale factor used at beginning
> +	 * of a slice.
> +	 * PPS21[7:6] - Reserved
> +	 */
> +	u8 initial_scale_value;
> +	/**
> +	 * @scale_increment_interval:
> +	 * PPS22[7:0], PPS23[7:0] - Number of group times between incrementing
> +	 * the rcXformScale factor at end of a slice.
> +	 */
> +	__be16 scale_increment_interval;
> +	/**
> +	 * @scale_decrement_interval_high:
> +	 * PPS24[3:0] - Higher 4 bits indicating number of group times between
> +	 * decrementing the rcXformScale factor at beginning of a slice.
> +	 * PPS24[7:4] - Reserved
> +	 */
> +	u8 scale_decrement_interval_high;
> +	/**
> +	 * @scale_decrement_interval_low:
> +	 * PPS25[7:0] - Lower 8 bits of scale decrement interval
> +	 */
> +	u8 scale_decrement_interval_low;
> +	/**
> +	 * @pps26_reserved:
> +	 * PPS26[7:0]
> +	 */
> +	u8 pps26_reserved;
> +	/**
> +	 * @first_line_bpg_offset:
> +	 * PPS27[4:0] - Number of additional bits that are allocated
> +	 * for each group on first line of a slice.
> +	 * PPS27[7:5] - Reserved
> +	 */
> +	u8 first_line_bpg_offset;
> +	/**
> +	 * @nfl_bpg_offset:
> +	 * PPS28[7:0], PPS29[7:0] - Number of bits including frac bits
> +	 * deallocated for each group for groups after the first line of slice.
> +	 */
> +	__be16 nfl_bpg_offset;
> +	/**
> +	 * @slice_bpg_offset:
> +	 * PPS30, PPS31[7:0] - Number of bits that are deallocated for each
> +	 * group to enforce the slice constraint.
> +	 */
> +	__be16 slice_bpg_offset;
> +	/**
> +	 * @initial_offset:
> +	 * PPS32,33[7:0] - Initial value for rcXformOffset
> +	 */
> +	__be16 initial_offset;
> +	/**
> +	 * @final_offset:
> +	 * PPS34,35[7:0] - Maximum end-of-slice value for rcXformOffset
> +	 */
> +	__be16 final_offset;
> +	/**
> +	 * @flatness_min_qp:
> +	 * PPS36[4:0] - Minimum QP at which flatness is signaled and
> +	 * flatness QP adjustment is made.
> +	 * PPS36[7:5] - Reserved
> +	 */
> +	u8 flatness_min_qp;
> +	/**
> +	 * @flatness_max_qp:
> +	 * PPS37[4:0] - Max QP at which flatness is signalled and
> +	 * the flatness adjustment is made.
> +	 * PPS37[7:5] - Reserved
> +	 */
> +	u8 flatness_max_qp;
> +	/**
> +	 * @rc_model_size:
> +	 * PPS38,39[7:0] - Number of bits within RC Model.
> +	 */
> +	__be16 rc_model_size;
> +	/**
> +	 * @rc_edge_factor:
> +	 * PPS40[3:0] - Ratio of current activity vs, previous
> +	 * activity to determine presence of edge.
> +	 * PPS40[7:4] - Reserved
> +	 */
> +	u8 rc_edge_factor;
> +	/**
> +	 * @rc_quant_incr_limit0:
> +	 * PPS41[4:0] - QP threshold used in short term RC
> +	 * PPS41[7:5] - Reserved
> +	 */
> +	u8 rc_quant_incr_limit0;
> +	/**
> +	 * @rc_quant_incr_limit1:
> +	 * PPS42[4:0] - QP threshold used in short term RC
> +	 * PPS42[7:5] - Reserved
> +	 */
> +	u8 rc_quant_incr_limit1;
> +	/**
> +	 * @rc_tgt_offset:
> +	 * PPS43[3:0] - Lower end of the variability range around the target
> +	 * bits per group that is allowed by short term RC.
> +	 * PPS43[7:4]- Upper end of the variability range around the target
> +	 * bits per group that i allowed by short term rc.
> +	 */
> +	u8 rc_tgt_offset;
> +	/**
> +	 * @rc_buf_thresh:
> +	 * PPS44[7:0] - PPS57[7:0] - Specifies the thresholds in RC model for
> +	 * the 15 ranges defined by 14 thresholds.
> +	 */
> +	u8 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1];
> +	/**
> +	 * @rc_range_parameters:
> +	 * PPS58[7:0] - PPS87[7:0]
> +	 * Parameters that correspond to each of the 15 ranges.
> +	 */
> +	__be16 rc_range_parameters[DSC_NUM_BUF_RANGES];
> +	/**
> +	 * @native_422_420:
> +	 * PPS88[0] - 0 = Native 4:2:2 not used
> +	 * 1 = Native 4:2:2 used
> +	 * PPS88[1] - 0 = Native 4:2:0 not use
> +	 * 1 = Native 4:2:0 used
> +	 * PPS88[7:2] - Reserved 6 bits
> +	 */
> +	u8 native_422_420;
> +	/**
> +	 * @second_line_bpg_offset:
> +	 * PPS89[4:0] - Additional bits/group budget for the
> +	 * second line of a slice in Native 4:2:0 mode.
> +	 * Set to 0 if DSC minor version is 1 or native420 is 0.
> +	 * PPS89[7:5] - Reserved
> +	 */
> +	u8 second_line_bpg_offset;
> +	/**
> +	 * @nsl_bpg_offset:
> +	 * PPS90[7:0], PPS91[7:0] - Number of bits that are deallocated
> +	 * for each group that is not in the second line of a slice.
> +	 */
> +	__be16 nsl_bpg_offset;
> +	/**
> +	 * @second_line_offset_adj:
> +	 * PPS92[7:0], PPS93[7:0] - Used as offset adjustment for the second
> +	 * line in Native 4:2:0 mode.
> +	 */
> +	__be16 second_line_offset_adj;
> +	/**
> +	 * @pps_long_94_reserved:
> +	 * PPS 94, 95, 96, 97 - Reserved
> +	 */
> +	u32 pps_long_94_reserved;
> +	/**
> +	 * @pps_long_98_reserved:
> +	 * PPS 98, 99, 100, 101 - Reserved
> +	 */
> +	u32 pps_long_98_reserved;
> +	/**
> +	 * @pps_long_102_reserved:
> +	 * PPS 102, 103, 104, 105 - Reserved
> +	 */
> +	u32 pps_long_102_reserved;
> +	/**
> +	 * @pps_long_106_reserved:
> +	 * PPS 106, 107, 108, 109 - reserved
> +	 */
> +	u32 pps_long_106_reserved;
> +	/**
> +	 * @pps_long_110_reserved:
> +	 * PPS 110, 111, 112, 113 - reserved
> +	 */
> +	u32 pps_long_110_reserved;
> +	/**
> +	 * @pps_long_114_reserved:
> +	 * PPS 114 - 117 - reserved
> +	 */
> +	u32 pps_long_114_reserved;
> +	/**
> +	 * @pps_long_118_reserved:
> +	 * PPS 118 - 121 - reserved
> +	 */
> +	u32 pps_long_118_reserved;
> +	/**
> +	 * @pps_long_122_reserved:
> +	 * PPS 122- 125 - reserved
> +	 */
> +	u32 pps_long_122_reserved;
> +	/**
> +	 * @pps_short_126_reserved:
> +	 * PPS 126, 127 - reserved
> +	 */
> +	__be16 pps_short_126_reserved;
> +};
> +
> +/**
> + * struct drm_dsc_pps_infoframe - DSC infoframe carrying the Picture Parameter
> + * Set Metadata
> + *
> + * This structure represents the DSC PPS infoframe required to send the Picture
> + * Parameter Set metadata required before enabling VESA Display Stream
> + * Compression. This is based on the DP Secondary Data Packet structure and
> + * comprises of SDP Header as defined in drm_dp_helper.h and PPS payload.
> + *
> + * @pps_header:
> + *

What's with the newline and blank line here? Maybe put the member docs
next to the member itself?

> + * Header for PPS as per DP SDP header format
> + *
> + * @pps_payload:
> + *
> + * PPS payload fields as per DSC specification Table 4-1
> + */
> +struct drm_dsc_pps_infoframe {
> +	struct dp_sdp_header pps_header;
> +	struct picture_parameter_set pps_payload;
> +} __packed;
> +
> +#endif /* _DRM_DSC_H_ */
> -- 
> 2.18.0

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 08/28] drm/dsc: Define Display Stream Compression PPS infoframe

[Ville Syrjälä]

On Thu, Nov 01, 2018 at 06:42:17PM +0200, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:20PM -0700, Manasi Navare wrote:
> > This patch defines a new header file for all the DSC 1.2 structures
> > and creates a structure for PPS infoframe which will be used to send
> > picture parameter set secondary data packet for display stream compression.
> > All the PPS infoframe syntax elements are taken from DSC 1.2 specification
> > from VESA.
> > 
> > v3:
> > * Add the SPDX shorthand (Chris Wilson)
> > v2:
> > * Do not use bitfields in the struct (Jani Nikula)
> > 
> > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > Cc: dri-devel@lists.freedesktop.org
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Cc: Harry Wentland <harry.wentland@amd.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Harry Wentland <harry.wentland@amd.com>
> > ---
> >  include/drm/drm_dsc.h | 347 ++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 347 insertions(+)
> >  create mode 100644 include/drm/drm_dsc.h
> > 
> > diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
> > new file mode 100644
> > index 000000000000..1d8a03983b90
> > --- /dev/null
> > +++ b/include/drm/drm_dsc.h
> > @@ -0,0 +1,347 @@
> > +/* SPDX-License-Identifier: MIT
> > + * Copyright (C) 2018 Intel Corp.
> > + *
> > + * Authors:
> > + * Manasi Navare <manasi.d.navare@intel.com>
> > + */
> > +
> > +#ifndef DRM_DSC_H_
> > +#define DRM_DSC_H_
> > +
> > +#include <drm/drm_dp_helper.h>
> > +
> > +/* VESA Display Stream Compression DSC 1.2 constants */
> > +#define DSC_NUM_BUF_RANGES	15
> 
> DRM_DSC_...  perhasp?

I guess DSC_ is a good enough namespace for this stuff.
drm_dp_helper.h uses only DP_ as the namespace for the spec stuff
as well.

> 
> > +
> > +/**
> > + * struct picture_parameter_set - Represents 128 bytes of Picture Parameter Set
> > + *
> > + * The VESA DSC standard defines picture parameter set (PPS) which display
> > + * stream compression encoders must communicate to decoders.
> > + * The PPS is encapsulated in 128 bytes (PPS 0 through PPS 127). The fields in
> > + * this structure are as per Table 4.1 in Vesa DSC specification v1.1/v1.2.
> > + * The PPS fields that span over more than a byte should be stored in Big Endian
> > + * format.
> > + */
> > +struct picture_parameter_set {
> 
> Needs a namespace too. Probably best make this struct packed. A
> BUILD_BUG_ON() somewhere to verify the size might also be nice.
> 
> > +	/**
> > +	 * @dsc_version:
> > +	 * PPS0[3:0] - dsc_version_minor: Contains Minor version of DSC
> > +	 * PPS0[7:4] - dsc_version_major: Contains major version of DSC
> > +	 */
> > +	u8 dsc_version;
> > +	/**
> > +	 * @pps_identifier:
> > +	 * PPS1[7:0] - Application specific identifier that can be
> > +	 * used to differentiate between different PPS tables.
> > +	 */
> > +	u8 pps_identifier;
> > +	/**
> > +	 * @pps_reserved:
> > +	 * PPS2[7:0]- RESERVED Byte
> > +	 */
> > +	u8 pps_reserved;
> > +	/**
> > +	 * @pps_3:
> > +	 * PPS3[3:0] - linebuf_depth: Contains linebuffer bit depth used to
> > +	 * generate the bitstream. (0x0 - 16 bits for DSC 1.2, 0x8 - 8 bits,
> > +	 * 0xA - 10 bits, 0xB - 11 bits, 0xC - 12 bits, 0xD - 13 bits,
> > +	 * 0xE - 14 bits for DSC1.2, 0xF - 14 bits for DSC 1.2.
> > +	 * PPS3[7:4] - bits_per_component: Bits per component for the original
> > +	 * pixels of the encoded picture.
> > +	 * 0x0 = 16bpc (allowed only when dsc_version_minor = 0x2)
> > +	 * 0x8 = 8bpc, 0xA = 10bpc, 0xC = 12bpc, 0xE = 14bpc (also
> > +	 * allowed only when dsc_minor_version = 0x2)
> > +	 */
> > +	u8 pps_3;
> > +	/**
> > +	 * @pps_4:
> > +	 * PPS4[1:0] -These are the most significant 2 bits of
> > +	 * compressed BPP bits_per_pixel[9:0] syntax element.
> > +	 * PPS4[2] - vbr_enable: 0 = VBR disabled, 1 = VBR enabled
> > +	 * PPS4[3] - simple_422: Indicates if decoder drops samples to
> > +	 * reconstruct the 4:2:2 picture.
> > +	 * PPS4[4] - Convert_rgb: Indicates if DSC color space conversion is
> > +	 * active.
> > +	 * PPS4[5] - blobk_pred_enable: Indicates if BP is used to code any
> > +	 * groups in picture
> > +	 * PPS4[7:6] - Reseved bits
> > +	 */
> > +	u8 pps_4;
> > +	/**
> > +	 * @bits_per_pixel_low:
> > +	 * PPS5[7:0] - This indicates the lower significant 8 bits of
> > +	 * the compressed BPP bits_per_pixel[9:0] element.
> > +	 */
> > +	u8 bits_per_pixel_low;
> > +	/**
> > +	 * @pic_height:
> > +	 * PPS6[7:0], PPS7[7:0] -pic_height: Specifies the number of pixel rows
> > +	 * within the raster.
> > +	 */
> > +	__be16 pic_height;
> > +	/**
> > +	 * @pic_width:
> > +	 * PPS8[7:0], PPS9[7:0] - pic_width: Number of pixel columns within
> > +	 * the raster.
> > +	 */
> > +	__be16 pic_width;
> > +	/**
> > +	 * @slice_height:
> > +	 * PPS10[7:0], PPS11[7:0] - Slice height in units of pixels.
> > +	 */
> > +	__be16 slice_height;
> > +	/**
> > +	 * @slice_width:
> > +	 * PPS12[7:0], PPS13[7:0] - Slice width in terms of pixels.
> > +	 */
> > +	__be16 slice_width;
> > +	/**
> > +	 * @chunk_size:
> > +	 * PPS14[7:0], PPS15[7:0] - Size in units of bytes of the chunks
> > +	 * that are used for slice multiplexing.
> > +	 */
> > +	__be16 chunk_size;
> > +	/**
> > +	 * @initial_xmit_delay_high:
> > +	 * PPS16[1:0] - Most Significant two bits of initial transmission delay.
> > +	 * It specifies the number of pixel times that the encoder waits before
> > +	 * transmitting data from its rate buffer.
> > +	 * PPS16[7:2] - Reserved
> > +	 */
> > +	u8 initial_xmit_delay_high;
> > +	/**
> > +	 * @initial_xmit_delay_low:
> > +	 * PPS17[7:0] - Least significant 8 bits of initial transmission delay.
> > +	 */
> > +	u8 initial_xmit_delay_low;
> > +	/**
> > +	 * @initial_dec_delay:
> > +	 *
> > +	 * PPS18[7:0], PPS19[7:0] - Initial decoding delay which is the number
> > +	 * of pixel times that the decoder accumulates data in its rate buffer
> > +	 * before starting to decode and output pixels.
> > +	 */
> > +	__be16 initial_dec_delay;
> > +	/**
> > +	 * @pps20_reserved:
> > +	 *
> > +	 * PPS20[7:0] - Reserved
> > +	 */
> > +	u8 pps20_reserved;
> > +	/**
> > +	 * @initial_scale_value:
> > +	 * PPS21[5:0] - Initial rcXformScale factor used at beginning
> > +	 * of a slice.
> > +	 * PPS21[7:6] - Reserved
> > +	 */
> > +	u8 initial_scale_value;
> > +	/**
> > +	 * @scale_increment_interval:
> > +	 * PPS22[7:0], PPS23[7:0] - Number of group times between incrementing
> > +	 * the rcXformScale factor at end of a slice.
> > +	 */
> > +	__be16 scale_increment_interval;
> > +	/**
> > +	 * @scale_decrement_interval_high:
> > +	 * PPS24[3:0] - Higher 4 bits indicating number of group times between
> > +	 * decrementing the rcXformScale factor at beginning of a slice.
> > +	 * PPS24[7:4] - Reserved
> > +	 */
> > +	u8 scale_decrement_interval_high;
> > +	/**
> > +	 * @scale_decrement_interval_low:
> > +	 * PPS25[7:0] - Lower 8 bits of scale decrement interval
> > +	 */
> > +	u8 scale_decrement_interval_low;
> > +	/**
> > +	 * @pps26_reserved:
> > +	 * PPS26[7:0]
> > +	 */
> > +	u8 pps26_reserved;
> > +	/**
> > +	 * @first_line_bpg_offset:
> > +	 * PPS27[4:0] - Number of additional bits that are allocated
> > +	 * for each group on first line of a slice.
> > +	 * PPS27[7:5] - Reserved
> > +	 */
> > +	u8 first_line_bpg_offset;
> > +	/**
> > +	 * @nfl_bpg_offset:
> > +	 * PPS28[7:0], PPS29[7:0] - Number of bits including frac bits
> > +	 * deallocated for each group for groups after the first line of slice.
> > +	 */
> > +	__be16 nfl_bpg_offset;
> > +	/**
> > +	 * @slice_bpg_offset:
> > +	 * PPS30, PPS31[7:0] - Number of bits that are deallocated for each
> > +	 * group to enforce the slice constraint.
> > +	 */
> > +	__be16 slice_bpg_offset;
> > +	/**
> > +	 * @initial_offset:
> > +	 * PPS32,33[7:0] - Initial value for rcXformOffset
> > +	 */
> > +	__be16 initial_offset;
> > +	/**
> > +	 * @final_offset:
> > +	 * PPS34,35[7:0] - Maximum end-of-slice value for rcXformOffset
> > +	 */
> > +	__be16 final_offset;
> > +	/**
> > +	 * @flatness_min_qp:
> > +	 * PPS36[4:0] - Minimum QP at which flatness is signaled and
> > +	 * flatness QP adjustment is made.
> > +	 * PPS36[7:5] - Reserved
> > +	 */
> > +	u8 flatness_min_qp;
> > +	/**
> > +	 * @flatness_max_qp:
> > +	 * PPS37[4:0] - Max QP at which flatness is signalled and
> > +	 * the flatness adjustment is made.
> > +	 * PPS37[7:5] - Reserved
> > +	 */
> > +	u8 flatness_max_qp;
> > +	/**
> > +	 * @rc_model_size:
> > +	 * PPS38,39[7:0] - Number of bits within RC Model.
> > +	 */
> > +	__be16 rc_model_size;
> > +	/**
> > +	 * @rc_edge_factor:
> > +	 * PPS40[3:0] - Ratio of current activity vs, previous
> > +	 * activity to determine presence of edge.
> > +	 * PPS40[7:4] - Reserved
> > +	 */
> > +	u8 rc_edge_factor;
> > +	/**
> > +	 * @rc_quant_incr_limit0:
> > +	 * PPS41[4:0] - QP threshold used in short term RC
> > +	 * PPS41[7:5] - Reserved
> > +	 */
> > +	u8 rc_quant_incr_limit0;
> > +	/**
> > +	 * @rc_quant_incr_limit1:
> > +	 * PPS42[4:0] - QP threshold used in short term RC
> > +	 * PPS42[7:5] - Reserved
> > +	 */
> > +	u8 rc_quant_incr_limit1;
> > +	/**
> > +	 * @rc_tgt_offset:
> > +	 * PPS43[3:0] - Lower end of the variability range around the target
> > +	 * bits per group that is allowed by short term RC.
> > +	 * PPS43[7:4]- Upper end of the variability range around the target
> > +	 * bits per group that i allowed by short term rc.
> > +	 */
> > +	u8 rc_tgt_offset;
> > +	/**
> > +	 * @rc_buf_thresh:
> > +	 * PPS44[7:0] - PPS57[7:0] - Specifies the thresholds in RC model for
> > +	 * the 15 ranges defined by 14 thresholds.
> > +	 */
> > +	u8 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1];
> > +	/**
> > +	 * @rc_range_parameters:
> > +	 * PPS58[7:0] - PPS87[7:0]
> > +	 * Parameters that correspond to each of the 15 ranges.
> > +	 */
> > +	__be16 rc_range_parameters[DSC_NUM_BUF_RANGES];
> > +	/**
> > +	 * @native_422_420:
> > +	 * PPS88[0] - 0 = Native 4:2:2 not used
> > +	 * 1 = Native 4:2:2 used
> > +	 * PPS88[1] - 0 = Native 4:2:0 not use
> > +	 * 1 = Native 4:2:0 used
> > +	 * PPS88[7:2] - Reserved 6 bits
> > +	 */
> > +	u8 native_422_420;
> > +	/**
> > +	 * @second_line_bpg_offset:
> > +	 * PPS89[4:0] - Additional bits/group budget for the
> > +	 * second line of a slice in Native 4:2:0 mode.
> > +	 * Set to 0 if DSC minor version is 1 or native420 is 0.
> > +	 * PPS89[7:5] - Reserved
> > +	 */
> > +	u8 second_line_bpg_offset;
> > +	/**
> > +	 * @nsl_bpg_offset:
> > +	 * PPS90[7:0], PPS91[7:0] - Number of bits that are deallocated
> > +	 * for each group that is not in the second line of a slice.
> > +	 */
> > +	__be16 nsl_bpg_offset;
> > +	/**
> > +	 * @second_line_offset_adj:
> > +	 * PPS92[7:0], PPS93[7:0] - Used as offset adjustment for the second
> > +	 * line in Native 4:2:0 mode.
> > +	 */
> > +	__be16 second_line_offset_adj;
> > +	/**
> > +	 * @pps_long_94_reserved:
> > +	 * PPS 94, 95, 96, 97 - Reserved
> > +	 */
> > +	u32 pps_long_94_reserved;
> > +	/**
> > +	 * @pps_long_98_reserved:
> > +	 * PPS 98, 99, 100, 101 - Reserved
> > +	 */
> > +	u32 pps_long_98_reserved;
> > +	/**
> > +	 * @pps_long_102_reserved:
> > +	 * PPS 102, 103, 104, 105 - Reserved
> > +	 */
> > +	u32 pps_long_102_reserved;
> > +	/**
> > +	 * @pps_long_106_reserved:
> > +	 * PPS 106, 107, 108, 109 - reserved
> > +	 */
> > +	u32 pps_long_106_reserved;
> > +	/**
> > +	 * @pps_long_110_reserved:
> > +	 * PPS 110, 111, 112, 113 - reserved
> > +	 */
> > +	u32 pps_long_110_reserved;
> > +	/**
> > +	 * @pps_long_114_reserved:
> > +	 * PPS 114 - 117 - reserved
> > +	 */
> > +	u32 pps_long_114_reserved;
> > +	/**
> > +	 * @pps_long_118_reserved:
> > +	 * PPS 118 - 121 - reserved
> > +	 */
> > +	u32 pps_long_118_reserved;
> > +	/**
> > +	 * @pps_long_122_reserved:
> > +	 * PPS 122- 125 - reserved
> > +	 */
> > +	u32 pps_long_122_reserved;
> > +	/**
> > +	 * @pps_short_126_reserved:
> > +	 * PPS 126, 127 - reserved
> > +	 */
> > +	__be16 pps_short_126_reserved;
> > +};
> > +
> > +/**
> > + * struct drm_dsc_pps_infoframe - DSC infoframe carrying the Picture Parameter
> > + * Set Metadata
> > + *
> > + * This structure represents the DSC PPS infoframe required to send the Picture
> > + * Parameter Set metadata required before enabling VESA Display Stream
> > + * Compression. This is based on the DP Secondary Data Packet structure and
> > + * comprises of SDP Header as defined in drm_dp_helper.h and PPS payload.
> > + *
> > + * @pps_header:
> > + *
> 
> What's with the newline and blank line here? Maybe put the member docs
> next to the member itself?
> 
> > + * Header for PPS as per DP SDP header format
> > + *
> > + * @pps_payload:
> > + *
> > + * PPS payload fields as per DSC specification Table 4-1
> > + */
> > +struct drm_dsc_pps_infoframe {
> > +	struct dp_sdp_header pps_header;
> > +	struct picture_parameter_set pps_payload;
> > +} __packed;
> > +
> > +#endif /* _DRM_DSC_H_ */
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 08/28] drm/dsc: Define Display Stream Compression PPS infoframe

[Manasi Navare]

On Thu, Nov 01, 2018 at 06:42:17PM +0200, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:20PM -0700, Manasi Navare wrote:
> > This patch defines a new header file for all the DSC 1.2 structures
> > and creates a structure for PPS infoframe which will be used to send
> > picture parameter set secondary data packet for display stream compression.
> > All the PPS infoframe syntax elements are taken from DSC 1.2 specification
> > from VESA.
> > 
> > v3:
> > * Add the SPDX shorthand (Chris Wilson)
> > v2:
> > * Do not use bitfields in the struct (Jani Nikula)
> > 
> > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > Cc: dri-devel@lists.freedesktop.org
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Cc: Harry Wentland <harry.wentland@amd.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Harry Wentland <harry.wentland@amd.com>
> > ---
> >  include/drm/drm_dsc.h | 347 ++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 347 insertions(+)
> >  create mode 100644 include/drm/drm_dsc.h
> > 
> > diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
> > new file mode 100644
> > index 000000000000..1d8a03983b90
> > --- /dev/null
> > +++ b/include/drm/drm_dsc.h
> > @@ -0,0 +1,347 @@
> > +/* SPDX-License-Identifier: MIT
> > + * Copyright (C) 2018 Intel Corp.
> > + *
> > + * Authors:
> > + * Manasi Navare <manasi.d.navare@intel.com>
> > + */
> > +
> > +#ifndef DRM_DSC_H_
> > +#define DRM_DSC_H_
> > +
> > +#include <drm/drm_dp_helper.h>
> > +
> > +/* VESA Display Stream Compression DSC 1.2 constants */
> > +#define DSC_NUM_BUF_RANGES	15
> 
> DRM_DSC_...  perhasp?
> 
> > +
> > +/**
> > + * struct picture_parameter_set - Represents 128 bytes of Picture Parameter Set
> > + *
> > + * The VESA DSC standard defines picture parameter set (PPS) which display
> > + * stream compression encoders must communicate to decoders.
> > + * The PPS is encapsulated in 128 bytes (PPS 0 through PPS 127). The fields in
> > + * this structure are as per Table 4.1 in Vesa DSC specification v1.1/v1.2.
> > + * The PPS fields that span over more than a byte should be stored in Big Endian
> > + * format.
> > + */
> > +struct picture_parameter_set {
> 
> Needs a namespace too. Probably best make this struct packed. A
> BUILD_BUG_ON() somewhere to verify the size might also be nice.
>

By namespace you mean renaming this struct as dsc_picture_parameter_set?
And yes will make this struct packed.
BUILD_BUG_ON() before using it to make sure the size is still 128 bytes?

 
> > +	/**
> > +	 * @dsc_version:
> > +	 * PPS0[3:0] - dsc_version_minor: Contains Minor version of DSC
> > +	 * PPS0[7:4] - dsc_version_major: Contains major version of DSC
> > +	 */
> > +	u8 dsc_version;
> > +	/**
> > +	 * @pps_identifier:
> > +	 * PPS1[7:0] - Application specific identifier that can be
> > +	 * used to differentiate between different PPS tables.
> > +	 */
> > +	u8 pps_identifier;
> > +	/**
> > +	 * @pps_reserved:
> > +	 * PPS2[7:0]- RESERVED Byte
> > +	 */
> > +	u8 pps_reserved;
> > +	/**
> > +	 * @pps_3:
> > +	 * PPS3[3:0] - linebuf_depth: Contains linebuffer bit depth used to
> > +	 * generate the bitstream. (0x0 - 16 bits for DSC 1.2, 0x8 - 8 bits,
> > +	 * 0xA - 10 bits, 0xB - 11 bits, 0xC - 12 bits, 0xD - 13 bits,
> > +	 * 0xE - 14 bits for DSC1.2, 0xF - 14 bits for DSC 1.2.
> > +	 * PPS3[7:4] - bits_per_component: Bits per component for the original
> > +	 * pixels of the encoded picture.
> > +	 * 0x0 = 16bpc (allowed only when dsc_version_minor = 0x2)
> > +	 * 0x8 = 8bpc, 0xA = 10bpc, 0xC = 12bpc, 0xE = 14bpc (also
> > +	 * allowed only when dsc_minor_version = 0x2)
> > +	 */
> > +	u8 pps_3;
> > +	/**
> > +	 * @pps_4:
> > +	 * PPS4[1:0] -These are the most significant 2 bits of
> > +	 * compressed BPP bits_per_pixel[9:0] syntax element.
> > +	 * PPS4[2] - vbr_enable: 0 = VBR disabled, 1 = VBR enabled
> > +	 * PPS4[3] - simple_422: Indicates if decoder drops samples to
> > +	 * reconstruct the 4:2:2 picture.
> > +	 * PPS4[4] - Convert_rgb: Indicates if DSC color space conversion is
> > +	 * active.
> > +	 * PPS4[5] - blobk_pred_enable: Indicates if BP is used to code any
> > +	 * groups in picture
> > +	 * PPS4[7:6] - Reseved bits
> > +	 */
> > +	u8 pps_4;
> > +	/**
> > +	 * @bits_per_pixel_low:
> > +	 * PPS5[7:0] - This indicates the lower significant 8 bits of
> > +	 * the compressed BPP bits_per_pixel[9:0] element.
> > +	 */
> > +	u8 bits_per_pixel_low;
> > +	/**
> > +	 * @pic_height:
> > +	 * PPS6[7:0], PPS7[7:0] -pic_height: Specifies the number of pixel rows
> > +	 * within the raster.
> > +	 */
> > +	__be16 pic_height;
> > +	/**
> > +	 * @pic_width:
> > +	 * PPS8[7:0], PPS9[7:0] - pic_width: Number of pixel columns within
> > +	 * the raster.
> > +	 */
> > +	__be16 pic_width;
> > +	/**
> > +	 * @slice_height:
> > +	 * PPS10[7:0], PPS11[7:0] - Slice height in units of pixels.
> > +	 */
> > +	__be16 slice_height;
> > +	/**
> > +	 * @slice_width:
> > +	 * PPS12[7:0], PPS13[7:0] - Slice width in terms of pixels.
> > +	 */
> > +	__be16 slice_width;
> > +	/**
> > +	 * @chunk_size:
> > +	 * PPS14[7:0], PPS15[7:0] - Size in units of bytes of the chunks
> > +	 * that are used for slice multiplexing.
> > +	 */
> > +	__be16 chunk_size;
> > +	/**
> > +	 * @initial_xmit_delay_high:
> > +	 * PPS16[1:0] - Most Significant two bits of initial transmission delay.
> > +	 * It specifies the number of pixel times that the encoder waits before
> > +	 * transmitting data from its rate buffer.
> > +	 * PPS16[7:2] - Reserved
> > +	 */
> > +	u8 initial_xmit_delay_high;
> > +	/**
> > +	 * @initial_xmit_delay_low:
> > +	 * PPS17[7:0] - Least significant 8 bits of initial transmission delay.
> > +	 */
> > +	u8 initial_xmit_delay_low;
> > +	/**
> > +	 * @initial_dec_delay:
> > +	 *
> > +	 * PPS18[7:0], PPS19[7:0] - Initial decoding delay which is the number
> > +	 * of pixel times that the decoder accumulates data in its rate buffer
> > +	 * before starting to decode and output pixels.
> > +	 */
> > +	__be16 initial_dec_delay;
> > +	/**
> > +	 * @pps20_reserved:
> > +	 *
> > +	 * PPS20[7:0] - Reserved
> > +	 */
> > +	u8 pps20_reserved;
> > +	/**
> > +	 * @initial_scale_value:
> > +	 * PPS21[5:0] - Initial rcXformScale factor used at beginning
> > +	 * of a slice.
> > +	 * PPS21[7:6] - Reserved
> > +	 */
> > +	u8 initial_scale_value;
> > +	/**
> > +	 * @scale_increment_interval:
> > +	 * PPS22[7:0], PPS23[7:0] - Number of group times between incrementing
> > +	 * the rcXformScale factor at end of a slice.
> > +	 */
> > +	__be16 scale_increment_interval;
> > +	/**
> > +	 * @scale_decrement_interval_high:
> > +	 * PPS24[3:0] - Higher 4 bits indicating number of group times between
> > +	 * decrementing the rcXformScale factor at beginning of a slice.
> > +	 * PPS24[7:4] - Reserved
> > +	 */
> > +	u8 scale_decrement_interval_high;
> > +	/**
> > +	 * @scale_decrement_interval_low:
> > +	 * PPS25[7:0] - Lower 8 bits of scale decrement interval
> > +	 */
> > +	u8 scale_decrement_interval_low;
> > +	/**
> > +	 * @pps26_reserved:
> > +	 * PPS26[7:0]
> > +	 */
> > +	u8 pps26_reserved;
> > +	/**
> > +	 * @first_line_bpg_offset:
> > +	 * PPS27[4:0] - Number of additional bits that are allocated
> > +	 * for each group on first line of a slice.
> > +	 * PPS27[7:5] - Reserved
> > +	 */
> > +	u8 first_line_bpg_offset;
> > +	/**
> > +	 * @nfl_bpg_offset:
> > +	 * PPS28[7:0], PPS29[7:0] - Number of bits including frac bits
> > +	 * deallocated for each group for groups after the first line of slice.
> > +	 */
> > +	__be16 nfl_bpg_offset;
> > +	/**
> > +	 * @slice_bpg_offset:
> > +	 * PPS30, PPS31[7:0] - Number of bits that are deallocated for each
> > +	 * group to enforce the slice constraint.
> > +	 */
> > +	__be16 slice_bpg_offset;
> > +	/**
> > +	 * @initial_offset:
> > +	 * PPS32,33[7:0] - Initial value for rcXformOffset
> > +	 */
> > +	__be16 initial_offset;
> > +	/**
> > +	 * @final_offset:
> > +	 * PPS34,35[7:0] - Maximum end-of-slice value for rcXformOffset
> > +	 */
> > +	__be16 final_offset;
> > +	/**
> > +	 * @flatness_min_qp:
> > +	 * PPS36[4:0] - Minimum QP at which flatness is signaled and
> > +	 * flatness QP adjustment is made.
> > +	 * PPS36[7:5] - Reserved
> > +	 */
> > +	u8 flatness_min_qp;
> > +	/**
> > +	 * @flatness_max_qp:
> > +	 * PPS37[4:0] - Max QP at which flatness is signalled and
> > +	 * the flatness adjustment is made.
> > +	 * PPS37[7:5] - Reserved
> > +	 */
> > +	u8 flatness_max_qp;
> > +	/**
> > +	 * @rc_model_size:
> > +	 * PPS38,39[7:0] - Number of bits within RC Model.
> > +	 */
> > +	__be16 rc_model_size;
> > +	/**
> > +	 * @rc_edge_factor:
> > +	 * PPS40[3:0] - Ratio of current activity vs, previous
> > +	 * activity to determine presence of edge.
> > +	 * PPS40[7:4] - Reserved
> > +	 */
> > +	u8 rc_edge_factor;
> > +	/**
> > +	 * @rc_quant_incr_limit0:
> > +	 * PPS41[4:0] - QP threshold used in short term RC
> > +	 * PPS41[7:5] - Reserved
> > +	 */
> > +	u8 rc_quant_incr_limit0;
> > +	/**
> > +	 * @rc_quant_incr_limit1:
> > +	 * PPS42[4:0] - QP threshold used in short term RC
> > +	 * PPS42[7:5] - Reserved
> > +	 */
> > +	u8 rc_quant_incr_limit1;
> > +	/**
> > +	 * @rc_tgt_offset:
> > +	 * PPS43[3:0] - Lower end of the variability range around the target
> > +	 * bits per group that is allowed by short term RC.
> > +	 * PPS43[7:4]- Upper end of the variability range around the target
> > +	 * bits per group that i allowed by short term rc.
> > +	 */
> > +	u8 rc_tgt_offset;
> > +	/**
> > +	 * @rc_buf_thresh:
> > +	 * PPS44[7:0] - PPS57[7:0] - Specifies the thresholds in RC model for
> > +	 * the 15 ranges defined by 14 thresholds.
> > +	 */
> > +	u8 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1];
> > +	/**
> > +	 * @rc_range_parameters:
> > +	 * PPS58[7:0] - PPS87[7:0]
> > +	 * Parameters that correspond to each of the 15 ranges.
> > +	 */
> > +	__be16 rc_range_parameters[DSC_NUM_BUF_RANGES];
> > +	/**
> > +	 * @native_422_420:
> > +	 * PPS88[0] - 0 = Native 4:2:2 not used
> > +	 * 1 = Native 4:2:2 used
> > +	 * PPS88[1] - 0 = Native 4:2:0 not use
> > +	 * 1 = Native 4:2:0 used
> > +	 * PPS88[7:2] - Reserved 6 bits
> > +	 */
> > +	u8 native_422_420;
> > +	/**
> > +	 * @second_line_bpg_offset:
> > +	 * PPS89[4:0] - Additional bits/group budget for the
> > +	 * second line of a slice in Native 4:2:0 mode.
> > +	 * Set to 0 if DSC minor version is 1 or native420 is 0.
> > +	 * PPS89[7:5] - Reserved
> > +	 */
> > +	u8 second_line_bpg_offset;
> > +	/**
> > +	 * @nsl_bpg_offset:
> > +	 * PPS90[7:0], PPS91[7:0] - Number of bits that are deallocated
> > +	 * for each group that is not in the second line of a slice.
> > +	 */
> > +	__be16 nsl_bpg_offset;
> > +	/**
> > +	 * @second_line_offset_adj:
> > +	 * PPS92[7:0], PPS93[7:0] - Used as offset adjustment for the second
> > +	 * line in Native 4:2:0 mode.
> > +	 */
> > +	__be16 second_line_offset_adj;
> > +	/**
> > +	 * @pps_long_94_reserved:
> > +	 * PPS 94, 95, 96, 97 - Reserved
> > +	 */
> > +	u32 pps_long_94_reserved;
> > +	/**
> > +	 * @pps_long_98_reserved:
> > +	 * PPS 98, 99, 100, 101 - Reserved
> > +	 */
> > +	u32 pps_long_98_reserved;
> > +	/**
> > +	 * @pps_long_102_reserved:
> > +	 * PPS 102, 103, 104, 105 - Reserved
> > +	 */
> > +	u32 pps_long_102_reserved;
> > +	/**
> > +	 * @pps_long_106_reserved:
> > +	 * PPS 106, 107, 108, 109 - reserved
> > +	 */
> > +	u32 pps_long_106_reserved;
> > +	/**
> > +	 * @pps_long_110_reserved:
> > +	 * PPS 110, 111, 112, 113 - reserved
> > +	 */
> > +	u32 pps_long_110_reserved;
> > +	/**
> > +	 * @pps_long_114_reserved:
> > +	 * PPS 114 - 117 - reserved
> > +	 */
> > +	u32 pps_long_114_reserved;
> > +	/**
> > +	 * @pps_long_118_reserved:
> > +	 * PPS 118 - 121 - reserved
> > +	 */
> > +	u32 pps_long_118_reserved;
> > +	/**
> > +	 * @pps_long_122_reserved:
> > +	 * PPS 122- 125 - reserved
> > +	 */
> > +	u32 pps_long_122_reserved;
> > +	/**
> > +	 * @pps_short_126_reserved:
> > +	 * PPS 126, 127 - reserved
> > +	 */
> > +	__be16 pps_short_126_reserved;
> > +};
> > +
> > +/**
> > + * struct drm_dsc_pps_infoframe - DSC infoframe carrying the Picture Parameter
> > + * Set Metadata
> > + *
> > + * This structure represents the DSC PPS infoframe required to send the Picture
> > + * Parameter Set metadata required before enabling VESA Display Stream
> > + * Compression. This is based on the DP Secondary Data Packet structure and
> > + * comprises of SDP Header as defined in drm_dp_helper.h and PPS payload.
> > + *
> > + * @pps_header:
> > + *
> 
> What's with the newline and blank line here? Maybe put the member docs
> next to the member itself?
>

Yea makes sense will remove the newline and blank line.

Manasi
 
> > + * Header for PPS as per DP SDP header format
> > + *
> > + * @pps_payload:
> > + *
> > + * PPS payload fields as per DSC specification Table 4-1
> > + */
> > +struct drm_dsc_pps_infoframe {
> > +	struct dp_sdp_header pps_header;
> > +	struct picture_parameter_set pps_payload;
> > +} __packed;
> > +
> > +#endif /* _DRM_DSC_H_ */
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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[PATCH v6 09/28] drm/dsc: Define VESA Display Stream Compression Capabilities

[Manasi Navare]

From: Gaurav K Singh <gaurav.k.singh@intel.com>

This defines all the DSC parameters as per the VESA DSC spec
that will be required for DSC encoder/decoder

v6: (From Manasi)
* Add a bit mask for RANGE_BPG_OFFSET for 6 bits(Manasi)
v5 (From Manasi)
* Add the RC constants as per the spec
v4 (From Manasi)
* Add the DSC_MUX_WORD_SIZE constants (Manasi)

v3 (From Manasi)
* Remove the duplicate define (Suggested By:Harry Wentland)

v2: Define this struct in DRM (From Manasi)
* Changed the data types to u8/u16 instead of unsigned longs (Manasi)
* Remove driver specific fields (Manasi)
* Move this struct definition to DRM (Manasi)
* Define DSC 1.2 parameters (Manasi)
* Use DSC_NUM_BUF_RANGES (Manasi)
* Call it drm_dsc_config (Manasi)

Cc: dri-devel@lists.freedesktop.org
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
Co-developed-by: Manasi Navare <manasi.d.navare@intel.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 include/drm/drm_dsc.h | 115 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 114 insertions(+), 1 deletion(-)

diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
index 1d8a03983b90..e90078faeb56 100644
--- a/include/drm/drm_dsc.h
+++ b/include/drm/drm_dsc.h
@@ -11,7 +11,120 @@
 #include <drm/drm_dp_helper.h>
 
 /* VESA Display Stream Compression DSC 1.2 constants */
-#define DSC_NUM_BUF_RANGES	15
+#define DSC_NUM_BUF_RANGES			15
+#define DSC_MUX_WORD_SIZE_8_10_BPC		48
+#define DSC_MUX_WORD_SIZE_12_BPC		64
+#define DSC_RC_PIXELS_PER_GROUP			3
+#define DSC_SCALE_DECREMENT_INTERVAL_MAX	4095
+#define DSC_RANGE_BPG_OFFSET_MASK		0x3f
+
+/* Configuration for a single Rate Control model range */
+struct dsc_rc_range_parameters {
+	/* Min Quantization Parameters allowed for this range */
+	u8 range_min_qp;
+	/* Max Quantization Parameters allowed for this range */
+	u8 range_max_qp;
+	/* Bits/group offset to apply to target for this group */
+	u8 range_bpg_offset;
+};
+
+struct drm_dsc_config {
+	/* Bits / component for previous reconstructed line buffer */
+	u8 line_buf_depth;
+	/* Bits per component to code (must be 8, 10, or 12) */
+	u8 bits_per_component;
+	/*
+	 * Flag indicating to do RGB - YCoCg conversion
+	 * and back (should be 1 for RGB input)
+	 */
+	bool convert_rgb;
+	u8 slice_count;
+	/* Slice Width */
+	u16 slice_width;
+	/* Slice Height */
+	u16 slice_height;
+	/*
+	 * 4:2:2 enable mode (from PPS, 4:2:2 conversion happens
+	 * outside of DSC encode/decode algorithm)
+	 */
+	bool enable422;
+	/* Picture Width */
+	u16 pic_width;
+	/* Picture Height */
+	u16 pic_height;
+	/* Offset to bits/group used by RC to determine QP adjustment */
+	u8 rc_tgt_offset_high;
+	/* Offset to bits/group used by RC to determine QP adjustment */
+	u8 rc_tgt_offset_low;
+	/* Bits/pixel target << 4 (ie., 4 fractional bits) */
+	u16 bits_per_pixel;
+	/*
+	 * Factor to determine if an edge is present based
+	 * on the bits produced
+	 */
+	u8 rc_edge_factor;
+	/* Slow down incrementing once the range reaches this value */
+	u8 rc_quant_incr_limit1;
+	/* Slow down incrementing once the range reaches this value */
+	u8 rc_quant_incr_limit0;
+	/* Number of pixels to delay the initial transmission */
+	u16 initial_xmit_delay;
+	/* Number of pixels to delay the VLD on the decoder,not including SSM */
+	u16  initial_dec_delay;
+	/* Block prediction enable */
+	bool block_pred_enable;
+	/* Bits/group offset to use for first line of the slice */
+	u8 first_line_bpg_offset;
+	/* Value to use for RC model offset at slice start */
+	u16 initial_offset;
+	/* Thresholds defining each of the buffer ranges */
+	u16 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1];
+	/* Parameters for each of the RC ranges */
+	struct dsc_rc_range_parameters rc_range_params[DSC_NUM_BUF_RANGES];
+	/* Total size of RC model */
+	u16 rc_model_size;
+	/* Minimum QP where flatness information is sent */
+	u8 flatness_min_qp;
+	/* Maximum QP where flatness information is sent */
+	u8 flatness_max_qp;
+	/* Initial value for scale factor */
+	u8 initial_scale_value;
+	/* Decrement scale factor every scale_decrement_interval groups */
+	u16 scale_decrement_interval;
+	/* Increment scale factor every scale_increment_interval groups */
+	u16 scale_increment_interval;
+	/* Non-first line BPG offset to use */
+	u16 nfl_bpg_offset;
+	/* BPG offset used to enforce slice bit */
+	u16 slice_bpg_offset;
+	/* Final RC linear transformation offset value */
+	u16 final_offset;
+	/* Enable on-off VBR (ie., disable stuffing bits) */
+	bool vbr_enable;
+	/* Mux word size (in bits) for SSM mode */
+	u8 mux_word_size;
+	/*
+	 * The (max) size in bytes of the "chunks" that are
+	 * used in slice multiplexing
+	 */
+	u16 slice_chunk_size;
+	/* Rate Control buffer siz in bits */
+	u16 rc_bits;
+	/* DSC Minor Version */
+	u8 dsc_version_minor;
+	/* DSC Major version */
+	u8 dsc_version_major;
+	/* Native 4:2:2 support */
+	bool native_422;
+	/* Native 4:2:0 support */
+	bool native_420;
+	/* Additional bits/grp for seconnd line of slice for native 4:2:0 */
+	u8 second_line_bpg_offset;
+	/* Num of bits deallocated for each grp that is not in second line of slice */
+	u16 nsl_bpg_offset;
+	/* Offset adj fr second line in Native 4:2:0 mode */
+	u16 second_line_offset_adj;
+};
 
 /**
  * struct picture_parameter_set - Represents 128 bytes of Picture Parameter Set
-- 
2.18.0

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[PATCH v6 10/28] drm/dsc: Define Rate Control values that do not change over configurations

[Manasi Navare]

From: "Srivatsa, Anusha" <anusha.srivatsa@intel.com>

DSC has some Rate Control values that remain constant
across all configurations. These are as per the DSC
standard.

v3:
* Define them in drm_dsc.h as they are
DSC constants (Manasi)
v2:
* Add DP_DSC_ prefix (Jani Nikula)

Cc: dri-devel@lists.freedesktop.org
Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
---
 include/drm/drm_dsc.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
index e90078faeb56..986f962f38d4 100644
--- a/include/drm/drm_dsc.h
+++ b/include/drm/drm_dsc.h
@@ -18,6 +18,12 @@
 #define DSC_SCALE_DECREMENT_INTERVAL_MAX	4095
 #define DSC_RANGE_BPG_OFFSET_MASK		0x3f
 
+/* DSC Rate Control Constants */
+#define DSC_RC_MODEL_SIZE_CONST		    8192
+#define DSC_RC_EDGE_FACTOR_CONST	    6
+#define DSC_RC_TGT_OFFSET_HI_CONST	    3
+#define DSC_RC_TGT_OFFSET_LO_CONST	    3
+
 /* Configuration for a single Rate Control model range */
 struct dsc_rc_range_parameters {
 	/* Min Quantization Parameters allowed for this range */
-- 
2.18.0

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[PATCH v6 11/28] drm/dsc: Add helpers for DSC picture parameter set infoframes

[Manasi Navare]

According to Display Stream compression spec 1.2, the picture
parameter set metadata is sent from source to sink device
using the DP Secondary data packet. An infoframe is formed
for the PPS SDP header and PPS SDP payload bytes.
This patch adds helpers to fill the PPS SDP header
and PPS SDP payload according to the DSC 1.2 specification.

v6:
* Use proper sequence points for breaking down the
assignments (Chris Wilson)
* Use SPDX identifier
v5:
Do not use bitfields for DRM structs (Jani N)
v4:
* Use DSC constants for params that dont change across
configurations
v3:
* Add reference to added kernel-docs in Documentation/gpu/drm-kms-helpers.rst
(Daniel Vetter)

v2:
* Add EXPORT_SYMBOL for the drm functions (Manasi)

Cc: dri-devel@lists.freedesktop.org
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
---
 Documentation/gpu/drm-kms-helpers.rst |  12 ++
 drivers/gpu/drm/Makefile              |   2 +-
 drivers/gpu/drm/drm_dsc.c             | 223 ++++++++++++++++++++++++++
 include/drm/drm_dsc.h                 |  22 +++
 4 files changed, 258 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/drm_dsc.c

diff --git a/Documentation/gpu/drm-kms-helpers.rst b/Documentation/gpu/drm-kms-helpers.rst
index 4b4dc236ef6f..b422eb8edf16 100644
--- a/Documentation/gpu/drm-kms-helpers.rst
+++ b/Documentation/gpu/drm-kms-helpers.rst
@@ -232,6 +232,18 @@ MIPI DSI Helper Functions Reference
 .. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c
    :export:
 
+Display Stream Compression Helper Functions Reference
+=====================================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_dsc.c
+   :doc: dsc helpers
+
+.. kernel-doc:: include/drm/drm_dsc.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_dsc.c
+   :export:
+
 Output Probing Helper Functions Reference
 =========================================
 
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 576ba985e138..3a3e6fb6d476 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -32,7 +32,7 @@ drm-$(CONFIG_AGP) += drm_agpsupport.o
 drm-$(CONFIG_DEBUG_FS) += drm_debugfs.o drm_debugfs_crc.o
 drm-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
 
-drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
+drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_dsc.o drm_probe_helper.o \
 		drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
 		drm_kms_helper_common.o drm_dp_dual_mode_helper.o \
 		drm_simple_kms_helper.o drm_modeset_helper.o \
diff --git a/drivers/gpu/drm/drm_dsc.c b/drivers/gpu/drm/drm_dsc.c
new file mode 100644
index 000000000000..21ae8d015afd
--- /dev/null
+++ b/drivers/gpu/drm/drm_dsc.c
@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2018 Intel Corp
+ *
+ * Author:
+ * Manasi Navare <manasi.d.navare@intel.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_dsc.h>
+
+/**
+ * DOC: dsc helpers
+ *
+ * These functions contain some common logic and helpers to deal with VESA
+ * Display Stream Compression standard required for DSC on Display Port/eDP or
+ * MIPI display interfaces.
+ */
+
+/**
+ * drm_dsc_dp_pps_header_init() - Initializes the PPS Header
+ * for DisplayPort as per the DP 1.4 spec.
+ * @pps_sdp: Secondary data packet for DSC Picture Parameter Set
+ */
+void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp)
+{
+	memset(&pps_sdp->pps_header, 0, sizeof(pps_sdp->pps_header));
+
+	pps_sdp->pps_header.HB1 = DP_SDP_PPS;
+	pps_sdp->pps_header.HB2 = DP_SDP_PPS_HEADER_PAYLOAD_BYTES_MINUS_1;
+}
+EXPORT_SYMBOL(drm_dsc_dp_pps_header_init);
+
+/**
+ * drm_dsc_pps_infoframe_pack() - Populates the DSC PPS infoframe
+ * using the DSC configuration parameters in the order expected
+ * by the DSC Display Sink device. For the DSC, the sink device
+ * expects the PPS payload in the big endian format for the fields
+ * that span more than 1 byte.
+ *
+ * @pps_sdp:
+ * Secondary data packet for DSC Picture Parameter Set
+ * @dsc_cfg:
+ * DSC Configuration data filled by driver
+ */
+void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
+				struct drm_dsc_config *dsc_cfg)
+{
+	u8 i = 0;
+
+	memset(&pps_sdp->pps_payload, 0, sizeof(pps_sdp->pps_payload));
+
+	/* PPS 0 */
+	pps_sdp->pps_payload.dsc_version =
+		dsc_cfg->dsc_version_minor |
+		dsc_cfg->dsc_version_major << DSC_PPS_VERSION_MAJOR_SHIFT;
+
+	/* PPS 1, 2 is 0 */
+
+	/* PPS 3 */
+	pps_sdp->pps_payload.pps_3 =
+		dsc_cfg->line_buf_depth |
+		dsc_cfg->bits_per_component << DSC_PPS_BPC_SHIFT;
+
+	/* PPS 4 */
+	pps_sdp->pps_payload.pps_4 =
+		(u8)((dsc_cfg->bits_per_pixel & DSC_PPS_BPP_HIGH_MASK) >>
+		     DSC_PPS_MSB_SHIFT) |
+		(u8)dsc_cfg->vbr_enable << DSC_PPS_VBR_EN_SHIFT |
+		(u8)dsc_cfg->enable422 << DSC_PPS_SIMPLE422_SHIFT |
+		(u8)dsc_cfg->convert_rgb << DSC_PPS_CONVERT_RGB_SHIFT |
+		(u8)dsc_cfg->block_pred_enable << DSC_PPS_BLOCK_PRED_EN_SHIFT;
+
+	/* PPS 5 */
+	pps_sdp->pps_payload.bits_per_pixel_low =
+		(u8)(dsc_cfg->bits_per_pixel & DSC_PPS_LSB_MASK);
+
+	/*
+	 * The DSC panel expects the PPS packet to have big endian format
+	 * for data spanning 2 bytes. Use a macro cpu_to_be16() to convert
+	 * to big endian format. If format is little endian, it will swap
+	 * bytes to convert to Big endian else keep it unchanged.
+	 */
+
+	/* PPS 6, 7 */
+	pps_sdp->pps_payload.pic_height = cpu_to_be16(dsc_cfg->pic_height);
+
+	/* PPS 8, 9 */
+	pps_sdp->pps_payload.pic_width = cpu_to_be16(dsc_cfg->pic_width);
+
+	/* PPS 10, 11 */
+	pps_sdp->pps_payload.slice_height = cpu_to_be16(dsc_cfg->slice_height);
+
+	/* PPS 12, 13 */
+	pps_sdp->pps_payload.slice_width = cpu_to_be16(dsc_cfg->slice_width);
+
+	/* PPS 14, 15 */
+	pps_sdp->pps_payload.chunk_size = cpu_to_be16(dsc_cfg->slice_chunk_size);
+
+	/* PPS 16 */
+	pps_sdp->pps_payload.initial_xmit_delay_high =
+		(u8)((dsc_cfg->initial_xmit_delay &
+		      DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK) >>
+		     DSC_PPS_MSB_SHIFT);
+
+	/* PPS 17 */
+	pps_sdp->pps_payload.initial_xmit_delay_low =
+		(u8)(dsc_cfg->initial_xmit_delay & DSC_PPS_LSB_MASK);
+
+	/* PPS 18, 19 */
+	pps_sdp->pps_payload.initial_dec_delay =
+		cpu_to_be16(dsc_cfg->initial_dec_delay);
+
+	/* PPS 20 is 0 */
+
+	/* PPS 21 */
+	pps_sdp->pps_payload.initial_scale_value =
+		(u8)dsc_cfg->initial_scale_value;
+
+	/* PPS 22, 23 */
+	pps_sdp->pps_payload.scale_increment_interval =
+		cpu_to_be16(dsc_cfg->scale_increment_interval);
+
+	/* PPS 24 */
+	pps_sdp->pps_payload.scale_decrement_interval_high =
+		(u8)((dsc_cfg->scale_decrement_interval &
+		      DSC_PPS_SCALE_DEC_INT_HIGH_MASK) >>
+		     DSC_PPS_MSB_SHIFT);
+
+	/* PPS 25 */
+	pps_sdp->pps_payload.scale_decrement_interval_low =
+		(u8)(dsc_cfg->scale_decrement_interval & DSC_PPS_LSB_MASK);
+
+	/* PPS 26[7:0], PPS 27[7:5] RESERVED */
+
+	/* PPS 27 */
+	pps_sdp->pps_payload.first_line_bpg_offset =
+		(u8)dsc_cfg->first_line_bpg_offset;
+
+	/* PPS 28, 29 */
+	pps_sdp->pps_payload.nfl_bpg_offset =
+		cpu_to_be16(dsc_cfg->nfl_bpg_offset);
+
+	/* PPS 30, 31 */
+	pps_sdp->pps_payload.slice_bpg_offset =
+		cpu_to_be16(dsc_cfg->slice_bpg_offset);
+
+	/* PPS 32, 33 */
+	pps_sdp->pps_payload.initial_offset =
+		cpu_to_be16(dsc_cfg->initial_offset);
+
+	/* PPS 34, 35 */
+	pps_sdp->pps_payload.final_offset = cpu_to_be16(dsc_cfg->final_offset);
+
+	/* PPS 36 */
+	pps_sdp->pps_payload.flatness_min_qp = (u8)dsc_cfg->flatness_min_qp;
+
+	/* PPS 37 */
+	pps_sdp->pps_payload.flatness_max_qp = (u8)dsc_cfg->flatness_max_qp;
+
+	/* PPS 38, 39 */
+	pps_sdp->pps_payload.rc_model_size =
+		cpu_to_be16((u16)DSC_RC_MODEL_SIZE_CONST);
+
+	/* PPS 40 */
+	pps_sdp->pps_payload.rc_edge_factor = (u8)DSC_RC_EDGE_FACTOR_CONST;
+
+	/* PPS 41 */
+	pps_sdp->pps_payload.rc_quant_incr_limit0 =
+		(u8)dsc_cfg->rc_quant_incr_limit0;
+
+	/* PPS 42 */
+	pps_sdp->pps_payload.rc_quant_incr_limit1 =
+		(u8)dsc_cfg->rc_quant_incr_limit1;
+
+	/* PPS 43 */
+	pps_sdp->pps_payload.rc_tgt_offset = (u8)DSC_RC_TGT_OFFSET_LO_CONST |
+		(u8)DSC_RC_TGT_OFFSET_HI_CONST << DSC_PPS_RC_TGT_OFFSET_HI_SHIFT;
+
+	/* PPS 44 - 57 */
+	for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++)
+		pps_sdp->pps_payload.rc_buf_thresh[i] =
+			dsc_cfg->rc_buf_thresh[i];
+
+	/* PPS 58 - 87 */
+	/*
+	 * For DSC sink programming the RC Range parameter fields
+	 * are as follows: Min_qp[15:11], max_qp[10:6], offset[5:0]
+	 */
+	for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
+		pps_sdp->pps_payload.rc_range_parameters[i] =
+			(u16)((dsc_cfg->rc_range_params[i].range_min_qp <<
+			       DSC_PPS_RC_RANGE_MINQP_SHIFT) |
+			      (dsc_cfg->rc_range_params[i].range_max_qp <<
+			       DSC_PPS_RC_RANGE_MAXQP_SHIFT) |
+			      (dsc_cfg->rc_range_params[i].range_bpg_offset));
+		pps_sdp->pps_payload.rc_range_parameters[i] =
+			cpu_to_be16(pps_sdp->pps_payload.rc_range_parameters[i]);
+	}
+
+	/* PPS 88 */
+	pps_sdp->pps_payload.native_422_420 = (u8)dsc_cfg->native_422 |
+		(u8)dsc_cfg->native_420 << DSC_PPS_NATIVE_420_SHIFT;
+
+	/* PPS 89 */
+	pps_sdp->pps_payload.second_line_bpg_offset =
+		(u8)dsc_cfg->second_line_bpg_offset;
+
+	/* PPS 90, 91 */
+	pps_sdp->pps_payload.nsl_bpg_offset =
+		cpu_to_be16(dsc_cfg->nsl_bpg_offset);
+
+	/* PPS 92, 93 */
+	pps_sdp->pps_payload.second_line_offset_adj =
+		cpu_to_be16(dsc_cfg->second_line_offset_adj);
+
+	/* PPS 94 - 127 are O */
+}
+EXPORT_SYMBOL(drm_dsc_pps_infoframe_pack);
diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
index 986f962f38d4..0e5e3368d645 100644
--- a/include/drm/drm_dsc.h
+++ b/include/drm/drm_dsc.h
@@ -8,6 +8,7 @@
 #ifndef DRM_DSC_H_
 #define DRM_DSC_H_
 
+#include <linux/byteorder/generic.h>
 #include <drm/drm_dp_helper.h>
 
 /* VESA Display Stream Compression DSC 1.2 constants */
@@ -24,6 +25,23 @@
 #define DSC_RC_TGT_OFFSET_HI_CONST	    3
 #define DSC_RC_TGT_OFFSET_LO_CONST	    3
 
+/* DSC PPS constants and macros */
+#define DSC_PPS_VERSION_MAJOR_SHIFT		4
+#define DSC_PPS_BPC_SHIFT			4
+#define DSC_PPS_MSB_SHIFT			8
+#define DSC_PPS_LSB_MASK			(0xFF << 0)
+#define DSC_PPS_BPP_HIGH_MASK			(0x3 << 8)
+#define DSC_PPS_VBR_EN_SHIFT			2
+#define DSC_PPS_SIMPLE422_SHIFT			3
+#define DSC_PPS_CONVERT_RGB_SHIFT		4
+#define DSC_PPS_BLOCK_PRED_EN_SHIFT		5
+#define DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK	(0x3 << 8)
+#define DSC_PPS_SCALE_DEC_INT_HIGH_MASK		(0xF << 8)
+#define DSC_PPS_RC_TGT_OFFSET_HI_SHIFT		4
+#define DSC_PPS_RC_RANGE_MINQP_SHIFT		11
+#define DSC_PPS_RC_RANGE_MAXQP_SHIFT		6
+#define DSC_PPS_NATIVE_420_SHIFT		1
+
 /* Configuration for a single Rate Control model range */
 struct dsc_rc_range_parameters {
 	/* Min Quantization Parameters allowed for this range */
@@ -463,4 +481,8 @@ struct drm_dsc_pps_infoframe {
 	struct picture_parameter_set pps_payload;
 } __packed;
 
+void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp);
+void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
+				struct drm_dsc_config *dsc_cfg);
+
 #endif /* _DRM_DSC_H_ */
-- 
2.18.0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH v6 11/28] drm/dsc: Add helpers for DSC picture parameter set infoframes

[Ville Syrjälä]

On Wed, Oct 24, 2018 at 03:28:23PM -0700, Manasi Navare wrote:
> According to Display Stream compression spec 1.2, the picture
> parameter set metadata is sent from source to sink device
> using the DP Secondary data packet. An infoframe is formed
> for the PPS SDP header and PPS SDP payload bytes.
> This patch adds helpers to fill the PPS SDP header
> and PPS SDP payload according to the DSC 1.2 specification.
> 
> v6:
> * Use proper sequence points for breaking down the
> assignments (Chris Wilson)
> * Use SPDX identifier
> v5:
> Do not use bitfields for DRM structs (Jani N)
> v4:
> * Use DSC constants for params that dont change across
> configurations
> v3:
> * Add reference to added kernel-docs in Documentation/gpu/drm-kms-helpers.rst
> (Daniel Vetter)
> 
> v2:
> * Add EXPORT_SYMBOL for the drm functions (Manasi)
> 
> Cc: dri-devel@lists.freedesktop.org
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Cc: Harry Wentland <harry.wentland@amd.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Acked-by: Harry Wentland <harry.wentland@amd.com>
> ---
>  Documentation/gpu/drm-kms-helpers.rst |  12 ++
>  drivers/gpu/drm/Makefile              |   2 +-
>  drivers/gpu/drm/drm_dsc.c             | 223 ++++++++++++++++++++++++++
>  include/drm/drm_dsc.h                 |  22 +++
>  4 files changed, 258 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/gpu/drm/drm_dsc.c
> 
> diff --git a/Documentation/gpu/drm-kms-helpers.rst b/Documentation/gpu/drm-kms-helpers.rst
> index 4b4dc236ef6f..b422eb8edf16 100644
> --- a/Documentation/gpu/drm-kms-helpers.rst
> +++ b/Documentation/gpu/drm-kms-helpers.rst
> @@ -232,6 +232,18 @@ MIPI DSI Helper Functions Reference
>  .. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c
>     :export:
>  
> +Display Stream Compression Helper Functions Reference
> +=====================================================
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_dsc.c
> +   :doc: dsc helpers
> +
> +.. kernel-doc:: include/drm/drm_dsc.h
> +   :internal:
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_dsc.c
> +   :export:
> +
>  Output Probing Helper Functions Reference
>  =========================================
>  
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 576ba985e138..3a3e6fb6d476 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -32,7 +32,7 @@ drm-$(CONFIG_AGP) += drm_agpsupport.o
>  drm-$(CONFIG_DEBUG_FS) += drm_debugfs.o drm_debugfs_crc.o
>  drm-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
>  
> -drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
> +drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_dsc.o drm_probe_helper.o \
>  		drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
>  		drm_kms_helper_common.o drm_dp_dual_mode_helper.o \
>  		drm_simple_kms_helper.o drm_modeset_helper.o \
> diff --git a/drivers/gpu/drm/drm_dsc.c b/drivers/gpu/drm/drm_dsc.c
> new file mode 100644
> index 000000000000..21ae8d015afd
> --- /dev/null
> +++ b/drivers/gpu/drm/drm_dsc.c
> @@ -0,0 +1,223 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2018 Intel Corp
> + *
> + * Author:
> + * Manasi Navare <manasi.d.navare@intel.com>
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/errno.h>
> +#include <drm/drm_dp_helper.h>
> +#include <drm/drm_dsc.h>
> +
> +/**
> + * DOC: dsc helpers
> + *
> + * These functions contain some common logic and helpers to deal with VESA
> + * Display Stream Compression standard required for DSC on Display Port/eDP or
> + * MIPI display interfaces.
> + */
> +
> +/**
> + * drm_dsc_dp_pps_header_init() - Initializes the PPS Header
> + * for DisplayPort as per the DP 1.4 spec.
> + * @pps_sdp: Secondary data packet for DSC Picture Parameter Set
> + */
> +void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp)
> +{
> +	memset(&pps_sdp->pps_header, 0, sizeof(pps_sdp->pps_header));
> +
> +	pps_sdp->pps_header.HB1 = DP_SDP_PPS;
> +	pps_sdp->pps_header.HB2 = DP_SDP_PPS_HEADER_PAYLOAD_BYTES_MINUS_1;
> +}
> +EXPORT_SYMBOL(drm_dsc_dp_pps_header_init);
> +
> +/**
> + * drm_dsc_pps_infoframe_pack() - Populates the DSC PPS infoframe
> + * using the DSC configuration parameters in the order expected
> + * by the DSC Display Sink device. For the DSC, the sink device
> + * expects the PPS payload in the big endian format for the fields
> + * that span more than 1 byte.
> + *
> + * @pps_sdp:
> + * Secondary data packet for DSC Picture Parameter Set
> + * @dsc_cfg:
> + * DSC Configuration data filled by driver
> + */
> +void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
> +				struct drm_dsc_config *dsc_cfg)
> +{
> +	u8 i = 0;

int i;

> +
> +	memset(&pps_sdp->pps_payload, 0, sizeof(pps_sdp->pps_payload));
> +
> +	/* PPS 0 */
> +	pps_sdp->pps_payload.dsc_version =
> +		dsc_cfg->dsc_version_minor |
> +		dsc_cfg->dsc_version_major << DSC_PPS_VERSION_MAJOR_SHIFT;
> +
> +	/* PPS 1, 2 is 0 */
> +
> +	/* PPS 3 */
> +	pps_sdp->pps_payload.pps_3 =
> +		dsc_cfg->line_buf_depth |
> +		dsc_cfg->bits_per_component << DSC_PPS_BPC_SHIFT;
> +
> +	/* PPS 4 */
> +	pps_sdp->pps_payload.pps_4 =
> +		(u8)((dsc_cfg->bits_per_pixel & DSC_PPS_BPP_HIGH_MASK) >>
> +		     DSC_PPS_MSB_SHIFT) |
> +		(u8)dsc_cfg->vbr_enable << DSC_PPS_VBR_EN_SHIFT |
> +		(u8)dsc_cfg->enable422 << DSC_PPS_SIMPLE422_SHIFT |
> +		(u8)dsc_cfg->convert_rgb << DSC_PPS_CONVERT_RGB_SHIFT |
> +		(u8)dsc_cfg->block_pred_enable << DSC_PPS_BLOCK_PRED_EN_SHIFT;

What's with all the (u8) casts?

> +
> +	/* PPS 5 */
> +	pps_sdp->pps_payload.bits_per_pixel_low =
> +		(u8)(dsc_cfg->bits_per_pixel & DSC_PPS_LSB_MASK);
> +
> +	/*
> +	 * The DSC panel expects the PPS packet to have big endian format
> +	 * for data spanning 2 bytes. Use a macro cpu_to_be16() to convert
> +	 * to big endian format. If format is little endian, it will swap
> +	 * bytes to convert to Big endian else keep it unchanged.
> +	 */
> +
> +	/* PPS 6, 7 */
> +	pps_sdp->pps_payload.pic_height = cpu_to_be16(dsc_cfg->pic_height);
> +
> +	/* PPS 8, 9 */
> +	pps_sdp->pps_payload.pic_width = cpu_to_be16(dsc_cfg->pic_width);
> +
> +	/* PPS 10, 11 */
> +	pps_sdp->pps_payload.slice_height = cpu_to_be16(dsc_cfg->slice_height);
> +
> +	/* PPS 12, 13 */
> +	pps_sdp->pps_payload.slice_width = cpu_to_be16(dsc_cfg->slice_width);
> +
> +	/* PPS 14, 15 */
> +	pps_sdp->pps_payload.chunk_size = cpu_to_be16(dsc_cfg->slice_chunk_size);
> +
> +	/* PPS 16 */
> +	pps_sdp->pps_payload.initial_xmit_delay_high =
> +		(u8)((dsc_cfg->initial_xmit_delay &
> +		      DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK) >>
> +		     DSC_PPS_MSB_SHIFT);
> +
> +	/* PPS 17 */
> +	pps_sdp->pps_payload.initial_xmit_delay_low =
> +		(u8)(dsc_cfg->initial_xmit_delay & DSC_PPS_LSB_MASK);
> +
> +	/* PPS 18, 19 */
> +	pps_sdp->pps_payload.initial_dec_delay =
> +		cpu_to_be16(dsc_cfg->initial_dec_delay);
> +
> +	/* PPS 20 is 0 */
> +
> +	/* PPS 21 */
> +	pps_sdp->pps_payload.initial_scale_value =
> +		(u8)dsc_cfg->initial_scale_value;
> +
> +	/* PPS 22, 23 */
> +	pps_sdp->pps_payload.scale_increment_interval =
> +		cpu_to_be16(dsc_cfg->scale_increment_interval);
> +
> +	/* PPS 24 */
> +	pps_sdp->pps_payload.scale_decrement_interval_high =
> +		(u8)((dsc_cfg->scale_decrement_interval &
> +		      DSC_PPS_SCALE_DEC_INT_HIGH_MASK) >>
> +		     DSC_PPS_MSB_SHIFT);
> +
> +	/* PPS 25 */
> +	pps_sdp->pps_payload.scale_decrement_interval_low =
> +		(u8)(dsc_cfg->scale_decrement_interval & DSC_PPS_LSB_MASK);
> +
> +	/* PPS 26[7:0], PPS 27[7:5] RESERVED */
> +
> +	/* PPS 27 */
> +	pps_sdp->pps_payload.first_line_bpg_offset =
> +		(u8)dsc_cfg->first_line_bpg_offset;
> +
> +	/* PPS 28, 29 */
> +	pps_sdp->pps_payload.nfl_bpg_offset =
> +		cpu_to_be16(dsc_cfg->nfl_bpg_offset);
> +
> +	/* PPS 30, 31 */
> +	pps_sdp->pps_payload.slice_bpg_offset =
> +		cpu_to_be16(dsc_cfg->slice_bpg_offset);
> +
> +	/* PPS 32, 33 */
> +	pps_sdp->pps_payload.initial_offset =
> +		cpu_to_be16(dsc_cfg->initial_offset);
> +
> +	/* PPS 34, 35 */
> +	pps_sdp->pps_payload.final_offset = cpu_to_be16(dsc_cfg->final_offset);
> +
> +	/* PPS 36 */
> +	pps_sdp->pps_payload.flatness_min_qp = (u8)dsc_cfg->flatness_min_qp;
> +
> +	/* PPS 37 */
> +	pps_sdp->pps_payload.flatness_max_qp = (u8)dsc_cfg->flatness_max_qp;
> +
> +	/* PPS 38, 39 */
> +	pps_sdp->pps_payload.rc_model_size =
> +		cpu_to_be16((u16)DSC_RC_MODEL_SIZE_CONST);
> +
> +	/* PPS 40 */
> +	pps_sdp->pps_payload.rc_edge_factor = (u8)DSC_RC_EDGE_FACTOR_CONST;
> +
> +	/* PPS 41 */
> +	pps_sdp->pps_payload.rc_quant_incr_limit0 =
> +		(u8)dsc_cfg->rc_quant_incr_limit0;
> +
> +	/* PPS 42 */
> +	pps_sdp->pps_payload.rc_quant_incr_limit1 =
> +		(u8)dsc_cfg->rc_quant_incr_limit1;
> +
> +	/* PPS 43 */
> +	pps_sdp->pps_payload.rc_tgt_offset = (u8)DSC_RC_TGT_OFFSET_LO_CONST |
> +		(u8)DSC_RC_TGT_OFFSET_HI_CONST << DSC_PPS_RC_TGT_OFFSET_HI_SHIFT;
> +
> +	/* PPS 44 - 57 */
> +	for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++)

Is the -1 correct? The loop below doesn't have it.

> +		pps_sdp->pps_payload.rc_buf_thresh[i] =
> +			dsc_cfg->rc_buf_thresh[i];
> +
> +	/* PPS 58 - 87 */
> +	/*
> +	 * For DSC sink programming the RC Range parameter fields
> +	 * are as follows: Min_qp[15:11], max_qp[10:6], offset[5:0]
> +	 */
> +	for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
> +		pps_sdp->pps_payload.rc_range_parameters[i] =
> +			(u16)((dsc_cfg->rc_range_params[i].range_min_qp <<
> +			       DSC_PPS_RC_RANGE_MINQP_SHIFT) |
> +			      (dsc_cfg->rc_range_params[i].range_max_qp <<
> +			       DSC_PPS_RC_RANGE_MAXQP_SHIFT) |
> +			      (dsc_cfg->rc_range_params[i].range_bpg_offset));
> +		pps_sdp->pps_payload.rc_range_parameters[i] =
> +			cpu_to_be16(pps_sdp->pps_payload.rc_range_parameters[i]);
> +	}
> +
> +	/* PPS 88 */
> +	pps_sdp->pps_payload.native_422_420 = (u8)dsc_cfg->native_422 |
> +		(u8)dsc_cfg->native_420 << DSC_PPS_NATIVE_420_SHIFT;
> +
> +	/* PPS 89 */
> +	pps_sdp->pps_payload.second_line_bpg_offset =
> +		(u8)dsc_cfg->second_line_bpg_offset;
> +
> +	/* PPS 90, 91 */
> +	pps_sdp->pps_payload.nsl_bpg_offset =
> +		cpu_to_be16(dsc_cfg->nsl_bpg_offset);
> +
> +	/* PPS 92, 93 */
> +	pps_sdp->pps_payload.second_line_offset_adj =
> +		cpu_to_be16(dsc_cfg->second_line_offset_adj);
> +
> +	/* PPS 94 - 127 are O */
> +}
> +EXPORT_SYMBOL(drm_dsc_pps_infoframe_pack);
> diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
> index 986f962f38d4..0e5e3368d645 100644
> --- a/include/drm/drm_dsc.h
> +++ b/include/drm/drm_dsc.h
> @@ -8,6 +8,7 @@
>  #ifndef DRM_DSC_H_
>  #define DRM_DSC_H_
>  
> +#include <linux/byteorder/generic.h>

This header doesn't need that AFAICS.

>  #include <drm/drm_dp_helper.h>
>  
>  /* VESA Display Stream Compression DSC 1.2 constants */
> @@ -24,6 +25,23 @@
>  #define DSC_RC_TGT_OFFSET_HI_CONST	    3
>  #define DSC_RC_TGT_OFFSET_LO_CONST	    3
>  
> +/* DSC PPS constants and macros */
> +#define DSC_PPS_VERSION_MAJOR_SHIFT		4
> +#define DSC_PPS_BPC_SHIFT			4
> +#define DSC_PPS_MSB_SHIFT			8
> +#define DSC_PPS_LSB_MASK			(0xFF << 0)
> +#define DSC_PPS_BPP_HIGH_MASK			(0x3 << 8)
> +#define DSC_PPS_VBR_EN_SHIFT			2
> +#define DSC_PPS_SIMPLE422_SHIFT			3
> +#define DSC_PPS_CONVERT_RGB_SHIFT		4
> +#define DSC_PPS_BLOCK_PRED_EN_SHIFT		5
> +#define DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK	(0x3 << 8)
> +#define DSC_PPS_SCALE_DEC_INT_HIGH_MASK		(0xF << 8)
> +#define DSC_PPS_RC_TGT_OFFSET_HI_SHIFT		4
> +#define DSC_PPS_RC_RANGE_MINQP_SHIFT		11
> +#define DSC_PPS_RC_RANGE_MAXQP_SHIFT		6
> +#define DSC_PPS_NATIVE_420_SHIFT		1
> +
>  /* Configuration for a single Rate Control model range */
>  struct dsc_rc_range_parameters {
>  	/* Min Quantization Parameters allowed for this range */
> @@ -463,4 +481,8 @@ struct drm_dsc_pps_infoframe {
>  	struct picture_parameter_set pps_payload;
>  } __packed;
>  
> +void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp);
> +void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
> +				struct drm_dsc_config *dsc_cfg);
> +
>  #endif /* _DRM_DSC_H_ */
> -- 
> 2.18.0

-- 
Ville Syrjälä
Intel
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dri-devel@lists.freedesktop.org
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Re: [PATCH v6 11/28] drm/dsc: Add helpers for DSC picture parameter set infoframes

[Manasi Navare]

Thanks for reviewing this patch. Find some comments inline

On Thu, Nov 01, 2018 at 06:46:28PM +0200, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:23PM -0700, Manasi Navare wrote:
> > According to Display Stream compression spec 1.2, the picture
> > parameter set metadata is sent from source to sink device
> > using the DP Secondary data packet. An infoframe is formed
> > for the PPS SDP header and PPS SDP payload bytes.
> > This patch adds helpers to fill the PPS SDP header
> > and PPS SDP payload according to the DSC 1.2 specification.
> > 
> > v6:
> > * Use proper sequence points for breaking down the
> > assignments (Chris Wilson)
> > * Use SPDX identifier
> > v5:
> > Do not use bitfields for DRM structs (Jani N)
> > v4:
> > * Use DSC constants for params that dont change across
> > configurations
> > v3:
> > * Add reference to added kernel-docs in Documentation/gpu/drm-kms-helpers.rst
> > (Daniel Vetter)
> > 
> > v2:
> > * Add EXPORT_SYMBOL for the drm functions (Manasi)
> > 
> > Cc: dri-devel@lists.freedesktop.org
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Cc: Harry Wentland <harry.wentland@amd.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Acked-by: Harry Wentland <harry.wentland@amd.com>
> > ---
> >  Documentation/gpu/drm-kms-helpers.rst |  12 ++
> >  drivers/gpu/drm/Makefile              |   2 +-
> >  drivers/gpu/drm/drm_dsc.c             | 223 ++++++++++++++++++++++++++
> >  include/drm/drm_dsc.h                 |  22 +++
> >  4 files changed, 258 insertions(+), 1 deletion(-)
> >  create mode 100644 drivers/gpu/drm/drm_dsc.c
> > 
> > diff --git a/Documentation/gpu/drm-kms-helpers.rst b/Documentation/gpu/drm-kms-helpers.rst
> > index 4b4dc236ef6f..b422eb8edf16 100644
> > --- a/Documentation/gpu/drm-kms-helpers.rst
> > +++ b/Documentation/gpu/drm-kms-helpers.rst
> > @@ -232,6 +232,18 @@ MIPI DSI Helper Functions Reference
> >  .. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c
> >     :export:
> >  
> > +Display Stream Compression Helper Functions Reference
> > +=====================================================
> > +
> > +.. kernel-doc:: drivers/gpu/drm/drm_dsc.c
> > +   :doc: dsc helpers
> > +
> > +.. kernel-doc:: include/drm/drm_dsc.h
> > +   :internal:
> > +
> > +.. kernel-doc:: drivers/gpu/drm/drm_dsc.c
> > +   :export:
> > +
> >  Output Probing Helper Functions Reference
> >  =========================================
> >  
> > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > index 576ba985e138..3a3e6fb6d476 100644
> > --- a/drivers/gpu/drm/Makefile
> > +++ b/drivers/gpu/drm/Makefile
> > @@ -32,7 +32,7 @@ drm-$(CONFIG_AGP) += drm_agpsupport.o
> >  drm-$(CONFIG_DEBUG_FS) += drm_debugfs.o drm_debugfs_crc.o
> >  drm-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
> >  
> > -drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
> > +drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_dsc.o drm_probe_helper.o \
> >  		drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
> >  		drm_kms_helper_common.o drm_dp_dual_mode_helper.o \
> >  		drm_simple_kms_helper.o drm_modeset_helper.o \
> > diff --git a/drivers/gpu/drm/drm_dsc.c b/drivers/gpu/drm/drm_dsc.c
> > new file mode 100644
> > index 000000000000..21ae8d015afd
> > --- /dev/null
> > +++ b/drivers/gpu/drm/drm_dsc.c
> > @@ -0,0 +1,223 @@
> > +// SPDX-License-Identifier: MIT
> > +/*
> > + * Copyright © 2018 Intel Corp
> > + *
> > + * Author:
> > + * Manasi Navare <manasi.d.navare@intel.com>
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/init.h>
> > +#include <linux/errno.h>
> > +#include <drm/drm_dp_helper.h>
> > +#include <drm/drm_dsc.h>
> > +
> > +/**
> > + * DOC: dsc helpers
> > + *
> > + * These functions contain some common logic and helpers to deal with VESA
> > + * Display Stream Compression standard required for DSC on Display Port/eDP or
> > + * MIPI display interfaces.
> > + */
> > +
> > +/**
> > + * drm_dsc_dp_pps_header_init() - Initializes the PPS Header
> > + * for DisplayPort as per the DP 1.4 spec.
> > + * @pps_sdp: Secondary data packet for DSC Picture Parameter Set
> > + */
> > +void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp)
> > +{
> > +	memset(&pps_sdp->pps_header, 0, sizeof(pps_sdp->pps_header));
> > +
> > +	pps_sdp->pps_header.HB1 = DP_SDP_PPS;
> > +	pps_sdp->pps_header.HB2 = DP_SDP_PPS_HEADER_PAYLOAD_BYTES_MINUS_1;
> > +}
> > +EXPORT_SYMBOL(drm_dsc_dp_pps_header_init);
> > +
> > +/**
> > + * drm_dsc_pps_infoframe_pack() - Populates the DSC PPS infoframe
> > + * using the DSC configuration parameters in the order expected
> > + * by the DSC Display Sink device. For the DSC, the sink device
> > + * expects the PPS payload in the big endian format for the fields
> > + * that span more than 1 byte.
> > + *
> > + * @pps_sdp:
> > + * Secondary data packet for DSC Picture Parameter Set
> > + * @dsc_cfg:
> > + * DSC Configuration data filled by driver
> > + */
> > +void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
> > +				struct drm_dsc_config *dsc_cfg)
> > +{
> > +	u8 i = 0;
> 
> int i;

Ok will do,

> 
> > +
> > +	memset(&pps_sdp->pps_payload, 0, sizeof(pps_sdp->pps_payload));
> > +
> > +	/* PPS 0 */
> > +	pps_sdp->pps_payload.dsc_version =
> > +		dsc_cfg->dsc_version_minor |
> > +		dsc_cfg->dsc_version_major << DSC_PPS_VERSION_MAJOR_SHIFT;
> > +
> > +	/* PPS 1, 2 is 0 */
> > +
> > +	/* PPS 3 */
> > +	pps_sdp->pps_payload.pps_3 =
> > +		dsc_cfg->line_buf_depth |
> > +		dsc_cfg->bits_per_component << DSC_PPS_BPC_SHIFT;
> > +
> > +	/* PPS 4 */
> > +	pps_sdp->pps_payload.pps_4 =
> > +		(u8)((dsc_cfg->bits_per_pixel & DSC_PPS_BPP_HIGH_MASK) >>
> > +		     DSC_PPS_MSB_SHIFT) |
> > +		(u8)dsc_cfg->vbr_enable << DSC_PPS_VBR_EN_SHIFT |
> > +		(u8)dsc_cfg->enable422 << DSC_PPS_SIMPLE422_SHIFT |
> > +		(u8)dsc_cfg->convert_rgb << DSC_PPS_CONVERT_RGB_SHIFT |
> > +		(u8)dsc_cfg->block_pred_enable << DSC_PPS_BLOCK_PRED_EN_SHIFT;
> 
> What's with all the (u8) casts?

Since we are assigning to u8 value we dont need type cast, will remove it.

> 
> > +
> > +	/* PPS 5 */
> > +	pps_sdp->pps_payload.bits_per_pixel_low =
> > +		(u8)(dsc_cfg->bits_per_pixel & DSC_PPS_LSB_MASK);
> > +
> > +	/*
> > +	 * The DSC panel expects the PPS packet to have big endian format
> > +	 * for data spanning 2 bytes. Use a macro cpu_to_be16() to convert
> > +	 * to big endian format. If format is little endian, it will swap
> > +	 * bytes to convert to Big endian else keep it unchanged.
> > +	 */
> > +
> > +	/* PPS 6, 7 */
> > +	pps_sdp->pps_payload.pic_height = cpu_to_be16(dsc_cfg->pic_height);
> > +
> > +	/* PPS 8, 9 */
> > +	pps_sdp->pps_payload.pic_width = cpu_to_be16(dsc_cfg->pic_width);
> > +
> > +	/* PPS 10, 11 */
> > +	pps_sdp->pps_payload.slice_height = cpu_to_be16(dsc_cfg->slice_height);
> > +
> > +	/* PPS 12, 13 */
> > +	pps_sdp->pps_payload.slice_width = cpu_to_be16(dsc_cfg->slice_width);
> > +
> > +	/* PPS 14, 15 */
> > +	pps_sdp->pps_payload.chunk_size = cpu_to_be16(dsc_cfg->slice_chunk_size);
> > +
> > +	/* PPS 16 */
> > +	pps_sdp->pps_payload.initial_xmit_delay_high =
> > +		(u8)((dsc_cfg->initial_xmit_delay &
> > +		      DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK) >>
> > +		     DSC_PPS_MSB_SHIFT);
> > +
> > +	/* PPS 17 */
> > +	pps_sdp->pps_payload.initial_xmit_delay_low =
> > +		(u8)(dsc_cfg->initial_xmit_delay & DSC_PPS_LSB_MASK);
> > +
> > +	/* PPS 18, 19 */
> > +	pps_sdp->pps_payload.initial_dec_delay =
> > +		cpu_to_be16(dsc_cfg->initial_dec_delay);
> > +
> > +	/* PPS 20 is 0 */
> > +
> > +	/* PPS 21 */
> > +	pps_sdp->pps_payload.initial_scale_value =
> > +		(u8)dsc_cfg->initial_scale_value;
> > +
> > +	/* PPS 22, 23 */
> > +	pps_sdp->pps_payload.scale_increment_interval =
> > +		cpu_to_be16(dsc_cfg->scale_increment_interval);
> > +
> > +	/* PPS 24 */
> > +	pps_sdp->pps_payload.scale_decrement_interval_high =
> > +		(u8)((dsc_cfg->scale_decrement_interval &
> > +		      DSC_PPS_SCALE_DEC_INT_HIGH_MASK) >>
> > +		     DSC_PPS_MSB_SHIFT);
> > +
> > +	/* PPS 25 */
> > +	pps_sdp->pps_payload.scale_decrement_interval_low =
> > +		(u8)(dsc_cfg->scale_decrement_interval & DSC_PPS_LSB_MASK);
> > +
> > +	/* PPS 26[7:0], PPS 27[7:5] RESERVED */
> > +
> > +	/* PPS 27 */
> > +	pps_sdp->pps_payload.first_line_bpg_offset =
> > +		(u8)dsc_cfg->first_line_bpg_offset;
> > +
> > +	/* PPS 28, 29 */
> > +	pps_sdp->pps_payload.nfl_bpg_offset =
> > +		cpu_to_be16(dsc_cfg->nfl_bpg_offset);
> > +
> > +	/* PPS 30, 31 */
> > +	pps_sdp->pps_payload.slice_bpg_offset =
> > +		cpu_to_be16(dsc_cfg->slice_bpg_offset);
> > +
> > +	/* PPS 32, 33 */
> > +	pps_sdp->pps_payload.initial_offset =
> > +		cpu_to_be16(dsc_cfg->initial_offset);
> > +
> > +	/* PPS 34, 35 */
> > +	pps_sdp->pps_payload.final_offset = cpu_to_be16(dsc_cfg->final_offset);
> > +
> > +	/* PPS 36 */
> > +	pps_sdp->pps_payload.flatness_min_qp = (u8)dsc_cfg->flatness_min_qp;
> > +
> > +	/* PPS 37 */
> > +	pps_sdp->pps_payload.flatness_max_qp = (u8)dsc_cfg->flatness_max_qp;
> > +
> > +	/* PPS 38, 39 */
> > +	pps_sdp->pps_payload.rc_model_size =
> > +		cpu_to_be16((u16)DSC_RC_MODEL_SIZE_CONST);
> > +
> > +	/* PPS 40 */
> > +	pps_sdp->pps_payload.rc_edge_factor = (u8)DSC_RC_EDGE_FACTOR_CONST;
> > +
> > +	/* PPS 41 */
> > +	pps_sdp->pps_payload.rc_quant_incr_limit0 =
> > +		(u8)dsc_cfg->rc_quant_incr_limit0;
> > +
> > +	/* PPS 42 */
> > +	pps_sdp->pps_payload.rc_quant_incr_limit1 =
> > +		(u8)dsc_cfg->rc_quant_incr_limit1;
> > +
> > +	/* PPS 43 */
> > +	pps_sdp->pps_payload.rc_tgt_offset = (u8)DSC_RC_TGT_OFFSET_LO_CONST |
> > +		(u8)DSC_RC_TGT_OFFSET_HI_CONST << DSC_PPS_RC_TGT_OFFSET_HI_SHIFT;
> > +
> > +	/* PPS 44 - 57 */
> > +	for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++)
> 
> Is the -1 correct? The loop below doesn't have it.
> 
> > +		pps_sdp->pps_payload.rc_buf_thresh[i] =
> > +			dsc_cfg->rc_buf_thresh[i];
> > +
> > +	/* PPS 58 - 87 */
> > +	/*
> > +	 * For DSC sink programming the RC Range parameter fields
> > +	 * are as follows: Min_qp[15:11], max_qp[10:6], offset[5:0]
> > +	 */
> > +	for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
> > +		pps_sdp->pps_payload.rc_range_parameters[i] =
> > +			(u16)((dsc_cfg->rc_range_params[i].range_min_qp <<
> > +			       DSC_PPS_RC_RANGE_MINQP_SHIFT) |
> > +			      (dsc_cfg->rc_range_params[i].range_max_qp <<
> > +			       DSC_PPS_RC_RANGE_MAXQP_SHIFT) |
> > +			      (dsc_cfg->rc_range_params[i].range_bpg_offset));
> > +		pps_sdp->pps_payload.rc_range_parameters[i] =
> > +			cpu_to_be16(pps_sdp->pps_payload.rc_range_parameters[i]);
> > +	}
> > +
> > +	/* PPS 88 */
> > +	pps_sdp->pps_payload.native_422_420 = (u8)dsc_cfg->native_422 |
> > +		(u8)dsc_cfg->native_420 << DSC_PPS_NATIVE_420_SHIFT;
> > +
> > +	/* PPS 89 */
> > +	pps_sdp->pps_payload.second_line_bpg_offset =
> > +		(u8)dsc_cfg->second_line_bpg_offset;
> > +
> > +	/* PPS 90, 91 */
> > +	pps_sdp->pps_payload.nsl_bpg_offset =
> > +		cpu_to_be16(dsc_cfg->nsl_bpg_offset);
> > +
> > +	/* PPS 92, 93 */
> > +	pps_sdp->pps_payload.second_line_offset_adj =
> > +		cpu_to_be16(dsc_cfg->second_line_offset_adj);
> > +
> > +	/* PPS 94 - 127 are O */
> > +}
> > +EXPORT_SYMBOL(drm_dsc_pps_infoframe_pack);
> > diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
> > index 986f962f38d4..0e5e3368d645 100644
> > --- a/include/drm/drm_dsc.h
> > +++ b/include/drm/drm_dsc.h
> > @@ -8,6 +8,7 @@
> >  #ifndef DRM_DSC_H_
> >  #define DRM_DSC_H_
> >  
> > +#include <linux/byteorder/generic.h>
> 
> This header doesn't need that AFAICS.
>

I will move that to drm_dsc.c

Manasi
 
> >  #include <drm/drm_dp_helper.h>
> >  
> >  /* VESA Display Stream Compression DSC 1.2 constants */
> > @@ -24,6 +25,23 @@
> >  #define DSC_RC_TGT_OFFSET_HI_CONST	    3
> >  #define DSC_RC_TGT_OFFSET_LO_CONST	    3
> >  
> > +/* DSC PPS constants and macros */
> > +#define DSC_PPS_VERSION_MAJOR_SHIFT		4
> > +#define DSC_PPS_BPC_SHIFT			4
> > +#define DSC_PPS_MSB_SHIFT			8
> > +#define DSC_PPS_LSB_MASK			(0xFF << 0)
> > +#define DSC_PPS_BPP_HIGH_MASK			(0x3 << 8)
> > +#define DSC_PPS_VBR_EN_SHIFT			2
> > +#define DSC_PPS_SIMPLE422_SHIFT			3
> > +#define DSC_PPS_CONVERT_RGB_SHIFT		4
> > +#define DSC_PPS_BLOCK_PRED_EN_SHIFT		5
> > +#define DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK	(0x3 << 8)
> > +#define DSC_PPS_SCALE_DEC_INT_HIGH_MASK		(0xF << 8)
> > +#define DSC_PPS_RC_TGT_OFFSET_HI_SHIFT		4
> > +#define DSC_PPS_RC_RANGE_MINQP_SHIFT		11
> > +#define DSC_PPS_RC_RANGE_MAXQP_SHIFT		6
> > +#define DSC_PPS_NATIVE_420_SHIFT		1
> > +
> >  /* Configuration for a single Rate Control model range */
> >  struct dsc_rc_range_parameters {
> >  	/* Min Quantization Parameters allowed for this range */
> > @@ -463,4 +481,8 @@ struct drm_dsc_pps_infoframe {
> >  	struct picture_parameter_set pps_payload;
> >  } __packed;
> >  
> > +void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp);
> > +void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
> > +				struct drm_dsc_config *dsc_cfg);
> > +
> >  #endif /* _DRM_DSC_H_ */
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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Re: [PATCH v6 11/28] drm/dsc: Add helpers for DSC picture parameter set infoframes

[Manasi Navare]

On Thu, Nov 01, 2018 at 04:54:14PM -0700, Manasi Navare wrote:
> Thanks for reviewing this patch. Find some comments inline
> 
> On Thu, Nov 01, 2018 at 06:46:28PM +0200, Ville Syrjälä wrote:
> > On Wed, Oct 24, 2018 at 03:28:23PM -0700, Manasi Navare wrote:
> > > According to Display Stream compression spec 1.2, the picture
> > > parameter set metadata is sent from source to sink device
> > > using the DP Secondary data packet. An infoframe is formed
> > > for the PPS SDP header and PPS SDP payload bytes.
> > > This patch adds helpers to fill the PPS SDP header
> > > and PPS SDP payload according to the DSC 1.2 specification.
> > > 
> > > v6:
> > > * Use proper sequence points for breaking down the
> > > assignments (Chris Wilson)
> > > * Use SPDX identifier
> > > v5:
> > > Do not use bitfields for DRM structs (Jani N)
> > > v4:
> > > * Use DSC constants for params that dont change across
> > > configurations
> > > v3:
> > > * Add reference to added kernel-docs in Documentation/gpu/drm-kms-helpers.rst
> > > (Daniel Vetter)
> > > 
> > > v2:
> > > * Add EXPORT_SYMBOL for the drm functions (Manasi)
> > > 
> > > Cc: dri-devel@lists.freedesktop.org
> > > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Cc: Harry Wentland <harry.wentland@amd.com>
> > > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > > Acked-by: Harry Wentland <harry.wentland@amd.com>
> > > ---
> > >  Documentation/gpu/drm-kms-helpers.rst |  12 ++
> > >  drivers/gpu/drm/Makefile              |   2 +-
> > >  drivers/gpu/drm/drm_dsc.c             | 223 ++++++++++++++++++++++++++
> > >  include/drm/drm_dsc.h                 |  22 +++
> > >  4 files changed, 258 insertions(+), 1 deletion(-)
> > >  create mode 100644 drivers/gpu/drm/drm_dsc.c
> > > 
> > > diff --git a/Documentation/gpu/drm-kms-helpers.rst b/Documentation/gpu/drm-kms-helpers.rst
> > > index 4b4dc236ef6f..b422eb8edf16 100644
> > > --- a/Documentation/gpu/drm-kms-helpers.rst
> > > +++ b/Documentation/gpu/drm-kms-helpers.rst
> > > @@ -232,6 +232,18 @@ MIPI DSI Helper Functions Reference
> > >  .. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c
> > >     :export:
> > >  
> > > +Display Stream Compression Helper Functions Reference
> > > +=====================================================
> > > +
> > > +.. kernel-doc:: drivers/gpu/drm/drm_dsc.c
> > > +   :doc: dsc helpers
> > > +
> > > +.. kernel-doc:: include/drm/drm_dsc.h
> > > +   :internal:
> > > +
> > > +.. kernel-doc:: drivers/gpu/drm/drm_dsc.c
> > > +   :export:
> > > +
> > >  Output Probing Helper Functions Reference
> > >  =========================================
> > >  
> > > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > > index 576ba985e138..3a3e6fb6d476 100644
> > > --- a/drivers/gpu/drm/Makefile
> > > +++ b/drivers/gpu/drm/Makefile
> > > @@ -32,7 +32,7 @@ drm-$(CONFIG_AGP) += drm_agpsupport.o
> > >  drm-$(CONFIG_DEBUG_FS) += drm_debugfs.o drm_debugfs_crc.o
> > >  drm-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
> > >  
> > > -drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
> > > +drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_dsc.o drm_probe_helper.o \
> > >  		drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
> > >  		drm_kms_helper_common.o drm_dp_dual_mode_helper.o \
> > >  		drm_simple_kms_helper.o drm_modeset_helper.o \
> > > diff --git a/drivers/gpu/drm/drm_dsc.c b/drivers/gpu/drm/drm_dsc.c
> > > new file mode 100644
> > > index 000000000000..21ae8d015afd
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/drm_dsc.c
> > > @@ -0,0 +1,223 @@
> > > +// SPDX-License-Identifier: MIT
> > > +/*
> > > + * Copyright © 2018 Intel Corp
> > > + *
> > > + * Author:
> > > + * Manasi Navare <manasi.d.navare@intel.com>
> > > + */
> > > +
> > > +#include <linux/kernel.h>
> > > +#include <linux/module.h>
> > > +#include <linux/init.h>
> > > +#include <linux/errno.h>
> > > +#include <drm/drm_dp_helper.h>
> > > +#include <drm/drm_dsc.h>
> > > +
> > > +/**
> > > + * DOC: dsc helpers
> > > + *
> > > + * These functions contain some common logic and helpers to deal with VESA
> > > + * Display Stream Compression standard required for DSC on Display Port/eDP or
> > > + * MIPI display interfaces.
> > > + */
> > > +
> > > +/**
> > > + * drm_dsc_dp_pps_header_init() - Initializes the PPS Header
> > > + * for DisplayPort as per the DP 1.4 spec.
> > > + * @pps_sdp: Secondary data packet for DSC Picture Parameter Set
> > > + */
> > > +void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp)
> > > +{
> > > +	memset(&pps_sdp->pps_header, 0, sizeof(pps_sdp->pps_header));
> > > +
> > > +	pps_sdp->pps_header.HB1 = DP_SDP_PPS;
> > > +	pps_sdp->pps_header.HB2 = DP_SDP_PPS_HEADER_PAYLOAD_BYTES_MINUS_1;
> > > +}
> > > +EXPORT_SYMBOL(drm_dsc_dp_pps_header_init);
> > > +
> > > +/**
> > > + * drm_dsc_pps_infoframe_pack() - Populates the DSC PPS infoframe
> > > + * using the DSC configuration parameters in the order expected
> > > + * by the DSC Display Sink device. For the DSC, the sink device
> > > + * expects the PPS payload in the big endian format for the fields
> > > + * that span more than 1 byte.
> > > + *
> > > + * @pps_sdp:
> > > + * Secondary data packet for DSC Picture Parameter Set
> > > + * @dsc_cfg:
> > > + * DSC Configuration data filled by driver
> > > + */
> > > +void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
> > > +				struct drm_dsc_config *dsc_cfg)
> > > +{
> > > +	u8 i = 0;
> > 
> > int i;
> 
> Ok will do,
> 
> > 
> > > +
> > > +	memset(&pps_sdp->pps_payload, 0, sizeof(pps_sdp->pps_payload));
> > > +
> > > +	/* PPS 0 */
> > > +	pps_sdp->pps_payload.dsc_version =
> > > +		dsc_cfg->dsc_version_minor |
> > > +		dsc_cfg->dsc_version_major << DSC_PPS_VERSION_MAJOR_SHIFT;
> > > +
> > > +	/* PPS 1, 2 is 0 */
> > > +
> > > +	/* PPS 3 */
> > > +	pps_sdp->pps_payload.pps_3 =
> > > +		dsc_cfg->line_buf_depth |
> > > +		dsc_cfg->bits_per_component << DSC_PPS_BPC_SHIFT;
> > > +
> > > +	/* PPS 4 */
> > > +	pps_sdp->pps_payload.pps_4 =
> > > +		(u8)((dsc_cfg->bits_per_pixel & DSC_PPS_BPP_HIGH_MASK) >>
> > > +		     DSC_PPS_MSB_SHIFT) |
> > > +		(u8)dsc_cfg->vbr_enable << DSC_PPS_VBR_EN_SHIFT |
> > > +		(u8)dsc_cfg->enable422 << DSC_PPS_SIMPLE422_SHIFT |
> > > +		(u8)dsc_cfg->convert_rgb << DSC_PPS_CONVERT_RGB_SHIFT |
> > > +		(u8)dsc_cfg->block_pred_enable << DSC_PPS_BLOCK_PRED_EN_SHIFT;
> > 
> > What's with all the (u8) casts?
> 
> Since we are assigning to u8 value we dont need type cast, will remove it.
> 
> > 
> > > +
> > > +	/* PPS 5 */
> > > +	pps_sdp->pps_payload.bits_per_pixel_low =
> > > +		(u8)(dsc_cfg->bits_per_pixel & DSC_PPS_LSB_MASK);
> > > +
> > > +	/*
> > > +	 * The DSC panel expects the PPS packet to have big endian format
> > > +	 * for data spanning 2 bytes. Use a macro cpu_to_be16() to convert
> > > +	 * to big endian format. If format is little endian, it will swap
> > > +	 * bytes to convert to Big endian else keep it unchanged.
> > > +	 */
> > > +
> > > +	/* PPS 6, 7 */
> > > +	pps_sdp->pps_payload.pic_height = cpu_to_be16(dsc_cfg->pic_height);
> > > +
> > > +	/* PPS 8, 9 */
> > > +	pps_sdp->pps_payload.pic_width = cpu_to_be16(dsc_cfg->pic_width);
> > > +
> > > +	/* PPS 10, 11 */
> > > +	pps_sdp->pps_payload.slice_height = cpu_to_be16(dsc_cfg->slice_height);
> > > +
> > > +	/* PPS 12, 13 */
> > > +	pps_sdp->pps_payload.slice_width = cpu_to_be16(dsc_cfg->slice_width);
> > > +
> > > +	/* PPS 14, 15 */
> > > +	pps_sdp->pps_payload.chunk_size = cpu_to_be16(dsc_cfg->slice_chunk_size);
> > > +
> > > +	/* PPS 16 */
> > > +	pps_sdp->pps_payload.initial_xmit_delay_high =
> > > +		(u8)((dsc_cfg->initial_xmit_delay &
> > > +		      DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK) >>
> > > +		     DSC_PPS_MSB_SHIFT);
> > > +
> > > +	/* PPS 17 */
> > > +	pps_sdp->pps_payload.initial_xmit_delay_low =
> > > +		(u8)(dsc_cfg->initial_xmit_delay & DSC_PPS_LSB_MASK);
> > > +
> > > +	/* PPS 18, 19 */
> > > +	pps_sdp->pps_payload.initial_dec_delay =
> > > +		cpu_to_be16(dsc_cfg->initial_dec_delay);
> > > +
> > > +	/* PPS 20 is 0 */
> > > +
> > > +	/* PPS 21 */
> > > +	pps_sdp->pps_payload.initial_scale_value =
> > > +		(u8)dsc_cfg->initial_scale_value;
> > > +
> > > +	/* PPS 22, 23 */
> > > +	pps_sdp->pps_payload.scale_increment_interval =
> > > +		cpu_to_be16(dsc_cfg->scale_increment_interval);
> > > +
> > > +	/* PPS 24 */
> > > +	pps_sdp->pps_payload.scale_decrement_interval_high =
> > > +		(u8)((dsc_cfg->scale_decrement_interval &
> > > +		      DSC_PPS_SCALE_DEC_INT_HIGH_MASK) >>
> > > +		     DSC_PPS_MSB_SHIFT);
> > > +
> > > +	/* PPS 25 */
> > > +	pps_sdp->pps_payload.scale_decrement_interval_low =
> > > +		(u8)(dsc_cfg->scale_decrement_interval & DSC_PPS_LSB_MASK);
> > > +
> > > +	/* PPS 26[7:0], PPS 27[7:5] RESERVED */
> > > +
> > > +	/* PPS 27 */
> > > +	pps_sdp->pps_payload.first_line_bpg_offset =
> > > +		(u8)dsc_cfg->first_line_bpg_offset;
> > > +
> > > +	/* PPS 28, 29 */
> > > +	pps_sdp->pps_payload.nfl_bpg_offset =
> > > +		cpu_to_be16(dsc_cfg->nfl_bpg_offset);
> > > +
> > > +	/* PPS 30, 31 */
> > > +	pps_sdp->pps_payload.slice_bpg_offset =
> > > +		cpu_to_be16(dsc_cfg->slice_bpg_offset);
> > > +
> > > +	/* PPS 32, 33 */
> > > +	pps_sdp->pps_payload.initial_offset =
> > > +		cpu_to_be16(dsc_cfg->initial_offset);
> > > +
> > > +	/* PPS 34, 35 */
> > > +	pps_sdp->pps_payload.final_offset = cpu_to_be16(dsc_cfg->final_offset);
> > > +
> > > +	/* PPS 36 */
> > > +	pps_sdp->pps_payload.flatness_min_qp = (u8)dsc_cfg->flatness_min_qp;
> > > +
> > > +	/* PPS 37 */
> > > +	pps_sdp->pps_payload.flatness_max_qp = (u8)dsc_cfg->flatness_max_qp;
> > > +
> > > +	/* PPS 38, 39 */
> > > +	pps_sdp->pps_payload.rc_model_size =
> > > +		cpu_to_be16((u16)DSC_RC_MODEL_SIZE_CONST);
> > > +
> > > +	/* PPS 40 */
> > > +	pps_sdp->pps_payload.rc_edge_factor = (u8)DSC_RC_EDGE_FACTOR_CONST;
> > > +
> > > +	/* PPS 41 */
> > > +	pps_sdp->pps_payload.rc_quant_incr_limit0 =
> > > +		(u8)dsc_cfg->rc_quant_incr_limit0;
> > > +
> > > +	/* PPS 42 */
> > > +	pps_sdp->pps_payload.rc_quant_incr_limit1 =
> > > +		(u8)dsc_cfg->rc_quant_incr_limit1;
> > > +
> > > +	/* PPS 43 */
> > > +	pps_sdp->pps_payload.rc_tgt_offset = (u8)DSC_RC_TGT_OFFSET_LO_CONST |
> > > +		(u8)DSC_RC_TGT_OFFSET_HI_CONST << DSC_PPS_RC_TGT_OFFSET_HI_SHIFT;
> > > +
> > > +	/* PPS 44 - 57 */
> > > +	for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++)
> > 
> > Is the -1 correct? The loop below doesn't have it.

Forgot to address this. So this -1 is correct since there are only 14 RC_Buf_thresh values
as per the DSC spec Table 4-2 so it is 0 - 13.
DSC_NUM_BUF_RANGES is defined as 15

while rc_range_parameters there are 15 values so there is no -1 in below loop.

Manasi

> > 
> > > +		pps_sdp->pps_payload.rc_buf_thresh[i] =
> > > +			dsc_cfg->rc_buf_thresh[i];
> > > +
> > > +	/* PPS 58 - 87 */
> > > +	/*
> > > +	 * For DSC sink programming the RC Range parameter fields
> > > +	 * are as follows: Min_qp[15:11], max_qp[10:6], offset[5:0]
> > > +	 */
> > > +	for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
> > > +		pps_sdp->pps_payload.rc_range_parameters[i] =
> > > +			(u16)((dsc_cfg->rc_range_params[i].range_min_qp <<
> > > +			       DSC_PPS_RC_RANGE_MINQP_SHIFT) |
> > > +			      (dsc_cfg->rc_range_params[i].range_max_qp <<
> > > +			       DSC_PPS_RC_RANGE_MAXQP_SHIFT) |
> > > +			      (dsc_cfg->rc_range_params[i].range_bpg_offset));
> > > +		pps_sdp->pps_payload.rc_range_parameters[i] =
> > > +			cpu_to_be16(pps_sdp->pps_payload.rc_range_parameters[i]);
> > > +	}
> > > +
> > > +	/* PPS 88 */
> > > +	pps_sdp->pps_payload.native_422_420 = (u8)dsc_cfg->native_422 |
> > > +		(u8)dsc_cfg->native_420 << DSC_PPS_NATIVE_420_SHIFT;
> > > +
> > > +	/* PPS 89 */
> > > +	pps_sdp->pps_payload.second_line_bpg_offset =
> > > +		(u8)dsc_cfg->second_line_bpg_offset;
> > > +
> > > +	/* PPS 90, 91 */
> > > +	pps_sdp->pps_payload.nsl_bpg_offset =
> > > +		cpu_to_be16(dsc_cfg->nsl_bpg_offset);
> > > +
> > > +	/* PPS 92, 93 */
> > > +	pps_sdp->pps_payload.second_line_offset_adj =
> > > +		cpu_to_be16(dsc_cfg->second_line_offset_adj);
> > > +
> > > +	/* PPS 94 - 127 are O */
> > > +}
> > > +EXPORT_SYMBOL(drm_dsc_pps_infoframe_pack);
> > > diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
> > > index 986f962f38d4..0e5e3368d645 100644
> > > --- a/include/drm/drm_dsc.h
> > > +++ b/include/drm/drm_dsc.h
> > > @@ -8,6 +8,7 @@
> > >  #ifndef DRM_DSC_H_
> > >  #define DRM_DSC_H_
> > >  
> > > +#include <linux/byteorder/generic.h>
> > 
> > This header doesn't need that AFAICS.
> >
> 
> I will move that to drm_dsc.c
> 
> Manasi
>  
> > >  #include <drm/drm_dp_helper.h>
> > >  
> > >  /* VESA Display Stream Compression DSC 1.2 constants */
> > > @@ -24,6 +25,23 @@
> > >  #define DSC_RC_TGT_OFFSET_HI_CONST	    3
> > >  #define DSC_RC_TGT_OFFSET_LO_CONST	    3
> > >  
> > > +/* DSC PPS constants and macros */
> > > +#define DSC_PPS_VERSION_MAJOR_SHIFT		4
> > > +#define DSC_PPS_BPC_SHIFT			4
> > > +#define DSC_PPS_MSB_SHIFT			8
> > > +#define DSC_PPS_LSB_MASK			(0xFF << 0)
> > > +#define DSC_PPS_BPP_HIGH_MASK			(0x3 << 8)
> > > +#define DSC_PPS_VBR_EN_SHIFT			2
> > > +#define DSC_PPS_SIMPLE422_SHIFT			3
> > > +#define DSC_PPS_CONVERT_RGB_SHIFT		4
> > > +#define DSC_PPS_BLOCK_PRED_EN_SHIFT		5
> > > +#define DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK	(0x3 << 8)
> > > +#define DSC_PPS_SCALE_DEC_INT_HIGH_MASK		(0xF << 8)
> > > +#define DSC_PPS_RC_TGT_OFFSET_HI_SHIFT		4
> > > +#define DSC_PPS_RC_RANGE_MINQP_SHIFT		11
> > > +#define DSC_PPS_RC_RANGE_MAXQP_SHIFT		6
> > > +#define DSC_PPS_NATIVE_420_SHIFT		1
> > > +
> > >  /* Configuration for a single Rate Control model range */
> > >  struct dsc_rc_range_parameters {
> > >  	/* Min Quantization Parameters allowed for this range */
> > > @@ -463,4 +481,8 @@ struct drm_dsc_pps_infoframe {
> > >  	struct picture_parameter_set pps_payload;
> > >  } __packed;
> > >  
> > > +void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp);
> > > +void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
> > > +				struct drm_dsc_config *dsc_cfg);
> > > +
> > >  #endif /* _DRM_DSC_H_ */
> > > -- 
> > > 2.18.0
> > 
> > -- 
> > Ville Syrjälä
> > Intel
> _______________________________________________
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> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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[PATCH v6 12/28] drm/i915/dp: Add DSC params and DSC config to intel_crtc_state

[Manasi Navare]

Basic DSC parameters and DSC configuration data needs to be computed
for each of the requested mode during atomic check. This is
required since for certain modes, valid DSC parameters and config
data might not be computed in which case compression cannot be
enabled for that mode.
For that reason we need to add these params and config structure
to the intel_crtc_state so that if valid this state information
can directly be used while enabling DSC in atomic commit.

v2:
* Rebase on drm-tip (Manasi)

Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h  | 1 +
 drivers/gpu/drm/i915/intel_drv.h | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 2d7761b8ac07..45fd7894722b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -53,6 +53,7 @@
 #include <drm/drm_auth.h>
 #include <drm/drm_cache.h>
 #include <drm/drm_util.h>
+#include <drm/drm_dsc.h>
 
 #include "i915_params.h"
 #include "i915_reg.h"
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 62c051098859..27d47950f438 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -931,6 +931,15 @@ struct intel_crtc_state {
 
 	/* Output down scaling is done in LSPCON device */
 	bool lspcon_downsampling;
+
+	/* Display Stream compression state */
+	struct {
+		bool compression_enable;
+		bool dsc_split;
+		u16 compressed_bpp;
+		u8 slice_count;
+	} dsc_params;
+	struct drm_dsc_config dp_dsc_cfg;
 };
 
 struct intel_crtc {
-- 
2.18.0

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Re: [PATCH v6 12/28] drm/i915/dp: Add DSC params and DSC config to intel_crtc_state

[Manasi Navare]

On Wed, Oct 24, 2018 at 03:28:24PM -0700, Manasi Navare wrote:
> Basic DSC parameters and DSC configuration data needs to be computed
> for each of the requested mode during atomic check. This is
> required since for certain modes, valid DSC parameters and config
> data might not be computed in which case compression cannot be
> enabled for that mode.
> For that reason we need to add these params and config structure
> to the intel_crtc_state so that if valid this state information
> can directly be used while enabling DSC in atomic commit.
> 
> v2:
> * Rebase on drm-tip (Manasi)
> 
> Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.h  | 1 +
>  drivers/gpu/drm/i915/intel_drv.h | 9 +++++++++
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 2d7761b8ac07..45fd7894722b 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -53,6 +53,7 @@
>  #include <drm/drm_auth.h>
>  #include <drm/drm_cache.h>
>  #include <drm/drm_util.h>
> +#include <drm/drm_dsc.h>
>  
>  #include "i915_params.h"
>  #include "i915_reg.h"
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 62c051098859..27d47950f438 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -931,6 +931,15 @@ struct intel_crtc_state {
>  
>  	/* Output down scaling is done in LSPCON device */
>  	bool lspcon_downsampling;
> +
> +	/* Display Stream compression state */
> +	struct {
> +		bool compression_enable;
> +		bool dsc_split;
> +		u16 compressed_bpp;
> +		u8 slice_count;
> +	} dsc_params;
> +	struct drm_dsc_config dp_dsc_cfg;

Ville, Jani should this be defined as a pointer to struct drm_dsc_config?
struct drm_dsc_config *dp_dsc_cfg
since we populate this in intel_dp_compute_config and then on only read during
commit.

Manasi

>  };
>  
>  struct intel_crtc {
> -- 
> 2.18.0
> 
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Re: [PATCH v6 12/28] drm/i915/dp: Add DSC params and DSC config to intel_crtc_state

[Ville Syrjälä]

On Tue, Oct 30, 2018 at 04:53:49PM -0700, Manasi Navare wrote:
> On Wed, Oct 24, 2018 at 03:28:24PM -0700, Manasi Navare wrote:
> > Basic DSC parameters and DSC configuration data needs to be computed
> > for each of the requested mode during atomic check. This is
> > required since for certain modes, valid DSC parameters and config
> > data might not be computed in which case compression cannot be
> > enabled for that mode.
> > For that reason we need to add these params and config structure
> > to the intel_crtc_state so that if valid this state information
> > can directly be used while enabling DSC in atomic commit.
> > 
> > v2:
> > * Rebase on drm-tip (Manasi)
> > 
> > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_drv.h  | 1 +
> >  drivers/gpu/drm/i915/intel_drv.h | 9 +++++++++
> >  2 files changed, 10 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index 2d7761b8ac07..45fd7894722b 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -53,6 +53,7 @@
> >  #include <drm/drm_auth.h>
> >  #include <drm/drm_cache.h>
> >  #include <drm/drm_util.h>
> > +#include <drm/drm_dsc.h>
> >  
> >  #include "i915_params.h"
> >  #include "i915_reg.h"
> > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > index 62c051098859..27d47950f438 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -931,6 +931,15 @@ struct intel_crtc_state {
> >  
> >  	/* Output down scaling is done in LSPCON device */
> >  	bool lspcon_downsampling;
> > +
> > +	/* Display Stream compression state */
> > +	struct {
> > +		bool compression_enable;
> > +		bool dsc_split;
> > +		u16 compressed_bpp;
> > +		u8 slice_count;
> > +	} dsc_params;
> > +	struct drm_dsc_config dp_dsc_cfg;
> 
> Ville, Jani should this be defined as a pointer to struct drm_dsc_config?
> struct drm_dsc_config *dp_dsc_cfg
> since we populate this in intel_dp_compute_config and then on only read during
> commit.

Pointer to where exactly? You need the memory for it somewhere.

> 
> Manasi
> 
> >  };
> >  
> >  struct intel_crtc {
> > -- 
> > 2.18.0
> > 

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 12/28] drm/i915/dp: Add DSC params and DSC config to intel_crtc_state

[Manasi Navare]

On Wed, Oct 31, 2018 at 03:10:15PM +0200, Ville Syrjälä wrote:
> On Tue, Oct 30, 2018 at 04:53:49PM -0700, Manasi Navare wrote:
> > On Wed, Oct 24, 2018 at 03:28:24PM -0700, Manasi Navare wrote:
> > > Basic DSC parameters and DSC configuration data needs to be computed
> > > for each of the requested mode during atomic check. This is
> > > required since for certain modes, valid DSC parameters and config
> > > data might not be computed in which case compression cannot be
> > > enabled for that mode.
> > > For that reason we need to add these params and config structure
> > > to the intel_crtc_state so that if valid this state information
> > > can directly be used while enabling DSC in atomic commit.
> > > 
> > > v2:
> > > * Rebase on drm-tip (Manasi)
> > > 
> > > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/i915_drv.h  | 1 +
> > >  drivers/gpu/drm/i915/intel_drv.h | 9 +++++++++
> > >  2 files changed, 10 insertions(+)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > > index 2d7761b8ac07..45fd7894722b 100644
> > > --- a/drivers/gpu/drm/i915/i915_drv.h
> > > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > > @@ -53,6 +53,7 @@
> > >  #include <drm/drm_auth.h>
> > >  #include <drm/drm_cache.h>
> > >  #include <drm/drm_util.h>
> > > +#include <drm/drm_dsc.h>
> > >  
> > >  #include "i915_params.h"
> > >  #include "i915_reg.h"
> > > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > > index 62c051098859..27d47950f438 100644
> > > --- a/drivers/gpu/drm/i915/intel_drv.h
> > > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > > @@ -931,6 +931,15 @@ struct intel_crtc_state {
> > >  
> > >  	/* Output down scaling is done in LSPCON device */
> > >  	bool lspcon_downsampling;
> > > +
> > > +	/* Display Stream compression state */
> > > +	struct {
> > > +		bool compression_enable;
> > > +		bool dsc_split;
> > > +		u16 compressed_bpp;
> > > +		u8 slice_count;
> > > +	} dsc_params;
> > > +	struct drm_dsc_config dp_dsc_cfg;
> > 
> > Ville, Jani should this be defined as a pointer to struct drm_dsc_config?
> > struct drm_dsc_config *dp_dsc_cfg
> > since we populate this in intel_dp_compute_config and then on only read during
> > commit.
> 
> Pointer to where exactly? You need the memory for it somewhere.
>

struct drm_dsc_config  is defined in drm_dsc.h and gets populated later in the dp_compute_config.
So I guess wwe can leave it as strcut drm_dsc_config dp_dsc_cfg; in crtc_state?
Pass a pointer to that while populating in the compute-config() but then later in the commit
when we have to read from this to write the sdp infoframe, we just pass the struct directly, no 
need to pass a pointer since its gonna be read and also crtc_state will be a const

Is that correct?

Manasi
 
> > 
> > Manasi
> > 
> > >  };
> > >  
> > >  struct intel_crtc {
> > > -- 
> > > 2.18.0
> > > 
> 
> -- 
> Ville Syrjälä
> Intel
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Re: [PATCH v6 12/28] drm/i915/dp: Add DSC params and DSC config to intel_crtc_state

[Ville Syrjälä]

On Wed, Oct 31, 2018 at 09:05:05AM -0700, Manasi Navare wrote:
> On Wed, Oct 31, 2018 at 03:10:15PM +0200, Ville Syrjälä wrote:
> > On Tue, Oct 30, 2018 at 04:53:49PM -0700, Manasi Navare wrote:
> > > On Wed, Oct 24, 2018 at 03:28:24PM -0700, Manasi Navare wrote:
> > > > Basic DSC parameters and DSC configuration data needs to be computed
> > > > for each of the requested mode during atomic check. This is
> > > > required since for certain modes, valid DSC parameters and config
> > > > data might not be computed in which case compression cannot be
> > > > enabled for that mode.
> > > > For that reason we need to add these params and config structure
> > > > to the intel_crtc_state so that if valid this state information
> > > > can directly be used while enabling DSC in atomic commit.
> > > > 
> > > > v2:
> > > > * Rebase on drm-tip (Manasi)
> > > > 
> > > > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > > > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > > > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > > > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > > > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > > ---
> > > >  drivers/gpu/drm/i915/i915_drv.h  | 1 +
> > > >  drivers/gpu/drm/i915/intel_drv.h | 9 +++++++++
> > > >  2 files changed, 10 insertions(+)
> > > > 
> > > > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > > > index 2d7761b8ac07..45fd7894722b 100644
> > > > --- a/drivers/gpu/drm/i915/i915_drv.h
> > > > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > > > @@ -53,6 +53,7 @@
> > > >  #include <drm/drm_auth.h>
> > > >  #include <drm/drm_cache.h>
> > > >  #include <drm/drm_util.h>
> > > > +#include <drm/drm_dsc.h>
> > > >  
> > > >  #include "i915_params.h"
> > > >  #include "i915_reg.h"
> > > > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > > > index 62c051098859..27d47950f438 100644
> > > > --- a/drivers/gpu/drm/i915/intel_drv.h
> > > > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > > > @@ -931,6 +931,15 @@ struct intel_crtc_state {
> > > >  
> > > >  	/* Output down scaling is done in LSPCON device */
> > > >  	bool lspcon_downsampling;
> > > > +
> > > > +	/* Display Stream compression state */
> > > > +	struct {
> > > > +		bool compression_enable;
> > > > +		bool dsc_split;
> > > > +		u16 compressed_bpp;
> > > > +		u8 slice_count;
> > > > +	} dsc_params;
> > > > +	struct drm_dsc_config dp_dsc_cfg;
> > > 
> > > Ville, Jani should this be defined as a pointer to struct drm_dsc_config?
> > > struct drm_dsc_config *dp_dsc_cfg
> > > since we populate this in intel_dp_compute_config and then on only read during
> > > commit.
> > 
> > Pointer to where exactly? You need the memory for it somewhere.
> >
> 
> struct drm_dsc_config  is defined in drm_dsc.h and gets populated later in the dp_compute_config.
> So I guess wwe can leave it as strcut drm_dsc_config dp_dsc_cfg; in crtc_state?
> Pass a pointer to that while populating in the compute-config() but then later in the commit
> when we have to read from this to write the sdp infoframe, we just pass the struct directly, no 
> need to pass a pointer since its gonna be read and also crtc_state will be a const
> 
> Is that correct?

You don't want to be passing large structures by value, if that's what
you're suggesting.

-- 
Ville Syrjälä
Intel
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[PATCH v6 13/28] drm/i915/dp: Compute DSC pipe config in atomic check

[Manasi Navare]

DSC params like the enable, compressed bpp, slice count and
dsc_split are added to the intel_crtc_state. These parameters
are set based on the requested mode and available link parameters
during the pipe configuration in atomic check phase.
These values are then later used to populate the remaining DSC
and RC parameters before enbaling DSC in atomic commit.

v9:
* Rebase on top of drm-tip that now uses fast_narrow config
for edp (Manasi)
v8:
* Check for DSC bpc not 0 (manasi)

v7:
* Fix indentation in compute_m_n (Manasi)

v6 (From Gaurav):
* Remove function call of intel_dp_compute_dsc_params() and
invoke intel_dp_compute_dsc_params() in the patch where
it is defined to fix compilation warning (Gaurav)

v5:
Add drm_dsc_cfg in intel_crtc_state (Manasi)

v4:
* Rebase on refactoring of intel_dp_compute_config on tip (Manasi)
* Add a comment why we need to check PSR while enabling DSC (Gaurav)

v3:
* Check PPR > max_cdclock to use 2 VDSC instances (Ville)

v2:
* Add if-else for eDP/DP (Gaurav)

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |  20 +++-
 drivers/gpu/drm/i915/intel_display.h |   3 +-
 drivers/gpu/drm/i915/intel_dp.c      | 170 ++++++++++++++++++++++-----
 drivers/gpu/drm/i915/intel_dp_mst.c  |   2 +-
 4 files changed, 155 insertions(+), 40 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index fe045abb6472..18737bd82b68 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6434,7 +6434,7 @@ static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
 
 	pipe_config->fdi_lanes = lane;
 
-	intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
+	intel_link_compute_m_n(pipe_config->pipe_bpp, 0, lane, fdi_dotclock,
 			       link_bw, &pipe_config->fdi_m_n, false);
 
 	ret = ironlake_check_fdi_lanes(dev, intel_crtc->pipe, pipe_config);
@@ -6671,17 +6671,25 @@ static void compute_m_n(unsigned int m, unsigned int n,
 }
 
 void
-intel_link_compute_m_n(int bits_per_pixel, int nlanes,
+intel_link_compute_m_n(int bits_per_pixel, uint16_t compressed_bpp,
+		       int nlanes,
 		       int pixel_clock, int link_clock,
 		       struct intel_link_m_n *m_n,
 		       bool constant_n)
 {
 	m_n->tu = 64;
 
-	compute_m_n(bits_per_pixel * pixel_clock,
-		    link_clock * nlanes * 8,
-		    &m_n->gmch_m, &m_n->gmch_n,
-		    constant_n);
+	/* For DSC, Data M/N calculation uses compressed BPP */
+	if (compressed_bpp)
+		compute_m_n(compressed_bpp * pixel_clock,
+			    link_clock * nlanes * 8,
+			    &m_n->gmch_m, &m_n->gmch_n,
+			    constant_n);
+	else
+		compute_m_n(bits_per_pixel * pixel_clock,
+			    link_clock * nlanes * 8,
+			    &m_n->gmch_m, &m_n->gmch_n,
+			    constant_n);
 
 	compute_m_n(pixel_clock, link_clock,
 		    &m_n->link_m, &m_n->link_n,
diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
index 5d50decbcbb5..b0b23e1e9392 100644
--- a/drivers/gpu/drm/i915/intel_display.h
+++ b/drivers/gpu/drm/i915/intel_display.h
@@ -407,7 +407,8 @@ struct intel_link_m_n {
 	     (__i)++) \
 		for_each_if(plane)
 
-void intel_link_compute_m_n(int bpp, int nlanes,
+void intel_link_compute_m_n(int bpp, uint16_t compressed_bpp,
+			    int nlanes,
 			    int pixel_clock, int link_clock,
 			    struct intel_link_m_n *m_n,
 			    bool constant_n);
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 6f66a38ba0b2..a88f9371dd32 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -47,6 +47,8 @@
 
 /* DP DSC small joiner has 2 FIFOs each of 640 x 6 bytes */
 #define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
+#define DP_DSC_MIN_SUPPORTED_BPC		8
+#define DP_DSC_MAX_SUPPORTED_BPC		10
 
 /* DP DSC throughput values used for slice count calculations KPixels/s */
 #define DP_DSC_PEAK_PIXEL_RATE			2720000
@@ -1924,6 +1926,16 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
 		}
 	}
 
+	/* If DSC is supported, use the max value reported by panel */
+	if (INTEL_GEN(dev_priv) >= 10 &&
+	    drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
+		bpc = min_t(u8,
+			    drm_dp_dsc_sink_max_color_depth(intel_dp->dsc_dpcd),
+			    DP_DSC_MAX_SUPPORTED_BPC);
+		if (bpc)
+			bpp = 3 * bpc;
+	}
+
 	return bpp;
 }
 
@@ -1984,14 +1996,11 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
 				link_clock = intel_dp->common_rates[clock];
 				link_avail = intel_dp_max_data_rate(link_clock,
 								    lane_count);
-
-				if (mode_rate <= link_avail) {
-					pipe_config->lane_count = lane_count;
-					pipe_config->pipe_bpp = bpp;
-					pipe_config->port_clock = link_clock;
-
+				pipe_config->lane_count = lane_count;
+				pipe_config->pipe_bpp = bpp;
+				pipe_config->port_clock = link_clock;
+				if (mode_rate <= link_avail)
 					return true;
-				}
 			}
 		}
 	}
@@ -2020,14 +2029,11 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
 				link_clock = intel_dp->common_rates[clock];
 				link_avail = intel_dp_max_data_rate(link_clock,
 								    lane_count);
-
-				if (mode_rate <= link_avail) {
-					pipe_config->lane_count = lane_count;
-					pipe_config->pipe_bpp = bpp;
-					pipe_config->port_clock = link_clock;
-
+				pipe_config->lane_count = lane_count;
+				pipe_config->pipe_bpp = bpp;
+				pipe_config->port_clock = link_clock;
+				if (mode_rate <= link_avail)
 					return true;
-				}
 			}
 		}
 	}
@@ -2035,14 +2041,88 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
 	return false;
 }
 
+static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
+					struct intel_crtc_state *pipe_config,
+					struct link_config_limits *limits)
+{
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
+	enum pipe pipe = to_intel_crtc(pipe_config->base.crtc)->pipe;
+	u16 dsc_max_output_bpp = 0;
+	u8 dsc_dp_slice_count = 0;
+
+	if (INTEL_GEN(dev_priv) < 10 ||
+	    !drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd))
+		return false;
+
+	/* DP DSC only supported on Pipe B and C */
+	if (pipe == PIPE_A && !intel_dp_is_edp(intel_dp))
+		return false;
+
+	/* DSC not supported for DSC sink BPC < 8 */
+	if (limits->max_bpp < 3 * DP_DSC_MIN_SUPPORTED_BPC) {
+		DRM_DEBUG_KMS("No DSC support for less than 8bpc\n");
+		return false;
+	}
+
+	if (intel_dp_is_edp(intel_dp)) {
+		pipe_config->dsc_params.compressed_bpp =
+			drm_edp_dsc_sink_output_bpp(intel_dp->dsc_dpcd) >> 4;
+		pipe_config->dsc_params.slice_count =
+			drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
+							true);
+	} else {
+		dsc_max_output_bpp =
+			intel_dp_dsc_get_output_bpp(pipe_config->port_clock,
+						    pipe_config->lane_count,
+						    adjusted_mode->crtc_clock,
+						    adjusted_mode->crtc_hdisplay);
+		dsc_dp_slice_count =
+			intel_dp_dsc_get_slice_count(intel_dp,
+						     adjusted_mode->crtc_clock,
+						     adjusted_mode->crtc_hdisplay);
+		if (!(dsc_max_output_bpp && dsc_dp_slice_count)) {
+			DRM_DEBUG_KMS("Compressed BPP/Slice Count not supported\n");
+			return false;
+		}
+		pipe_config->dsc_params.compressed_bpp = dsc_max_output_bpp >> 4;
+		pipe_config->dsc_params.slice_count = dsc_dp_slice_count;
+	}
+	/*
+	 * VDSC engine operates at 1 Pixel per clock, so if peak pixel rate
+	 * is greater than the maximum Cdclock and if slice count is even
+	 * then we need to use 2 VDSC instances.
+	 */
+	pipe_config->dsc_params.dsc_split = false;
+	if (adjusted_mode->crtc_clock > dev_priv->max_cdclk_freq) {
+		if (pipe_config->dsc_params.slice_count > 1) {
+			pipe_config->dsc_params.dsc_split = true;
+		} else {
+			DRM_DEBUG_KMS("Cannot split stream to use 2 VDSC instances\n");
+			return false;
+		}
+	}
+	pipe_config->dsc_params.compression_enable = true;
+	DRM_DEBUG_KMS("DP DSC computed with Input Bpp = %d "
+		      "Compressed Bpp = %d Slice Count = %d\n",
+		      pipe_config->pipe_bpp,
+		      pipe_config->dsc_params.compressed_bpp,
+		      pipe_config->dsc_params.slice_count);
+
+	return true;
+}
+
 static bool
 intel_dp_compute_link_config(struct intel_encoder *encoder,
 			     struct intel_crtc_state *pipe_config)
 {
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 	struct link_config_limits limits;
 	int common_len;
+	bool ret = false;
 
 	common_len = intel_dp_common_len_rate_limit(intel_dp,
 						    intel_dp->max_link_rate);
@@ -2056,7 +2136,9 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
 	limits.min_lane_count = 1;
 	limits.max_lane_count = intel_dp_max_lane_count(intel_dp);
 
-	limits.min_bpp = 6 * 3;
+	limits.min_bpp = (INTEL_GEN(dev_priv) >= 10 &&
+			  drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) ?
+		DP_DSC_MIN_SUPPORTED_BPC * 3 : 6 * 3;
 	limits.max_bpp = intel_dp_compute_bpp(intel_dp, pipe_config);
 
 	if (intel_dp_is_edp(intel_dp) && intel_dp->edp_dpcd[0] < DP_EDP_14) {
@@ -2081,7 +2163,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
 		      intel_dp->common_rates[limits.max_clock],
 		      limits.max_bpp, adjusted_mode->crtc_clock);
 
-	if (intel_dp_is_edp(intel_dp)) {
+	if (intel_dp_is_edp(intel_dp))
 		/*
 		 * Optimize for fast and narrow. eDP 1.3 section 3.3 and eDP 1.4
 		 * section A.1: "It is recommended that the minimum number of
@@ -2091,26 +2173,48 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
 		 * Note that we use the max clock and lane count for eDP 1.3 and
 		 * earlier, and fast vs. wide is irrelevant.
 		 */
-		if (!intel_dp_compute_link_config_fast(intel_dp, pipe_config,
-						       &limits))
-			return false;
-	} else {
+		ret = intel_dp_compute_link_config_fast(intel_dp, pipe_config,
+							&limits);
+	else
 		/* Optimize for slow and wide. */
-		if (!intel_dp_compute_link_config_wide(intel_dp, pipe_config,
-						       &limits))
+		ret = intel_dp_compute_link_config_wide(intel_dp, pipe_config,
+							&limits);
+
+	/* enable compression if the mode doesn't fit available BW */
+	if (!ret) {
+		DRM_DEBUG_KMS("DP required Link rate %i does not fit available %i\n",
+			      intel_dp_link_required(adjusted_mode->crtc_clock,
+						     pipe_config->pipe_bpp),
+			      intel_dp_max_data_rate(pipe_config->port_clock,
+						     pipe_config->lane_count));
+
+		if (!intel_dp_dsc_compute_config(intel_dp, pipe_config,
+						 &limits))
 			return false;
 	}
 
-	DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
-		      pipe_config->lane_count, pipe_config->port_clock,
-		      pipe_config->pipe_bpp);
+	if (pipe_config->dsc_params.compression_enable) {
+		DRM_DEBUG_KMS("DP lane count %d clock %d Input bpp %d Compressed bpp %d\n",
+			      pipe_config->lane_count, pipe_config->port_clock,
+			      pipe_config->pipe_bpp,
+			      pipe_config->dsc_params.compressed_bpp);
 
-	DRM_DEBUG_KMS("DP link rate required %i available %i\n",
-		      intel_dp_link_required(adjusted_mode->crtc_clock,
-					     pipe_config->pipe_bpp),
-		      intel_dp_max_data_rate(pipe_config->port_clock,
-					     pipe_config->lane_count));
+		DRM_DEBUG_KMS("DP link rate required %i available %i\n",
+			      intel_dp_link_required(adjusted_mode->crtc_clock,
+						     pipe_config->dsc_params.compressed_bpp),
+			      intel_dp_max_data_rate(pipe_config->port_clock,
+						     pipe_config->lane_count));
+	} else {
+		DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
+			      pipe_config->lane_count, pipe_config->port_clock,
+			      pipe_config->pipe_bpp);
 
+		DRM_DEBUG_KMS("DP link rate required %i available %i\n",
+			      intel_dp_link_required(adjusted_mode->crtc_clock,
+						     pipe_config->pipe_bpp),
+			      intel_dp_max_data_rate(pipe_config->port_clock,
+						     pipe_config->lane_count));
+	}
 	return true;
 }
 
@@ -2194,7 +2298,9 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 			intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_LIMITED;
 	}
 
-	intel_link_compute_m_n(pipe_config->pipe_bpp, pipe_config->lane_count,
+	intel_link_compute_m_n(pipe_config->pipe_bpp,
+			       pipe_config->dsc_params.compressed_bpp,
+			       pipe_config->lane_count,
 			       adjusted_mode->crtc_clock,
 			       pipe_config->port_clock,
 			       &pipe_config->dp_m_n,
@@ -2203,7 +2309,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 	if (intel_connector->panel.downclock_mode != NULL &&
 		dev_priv->drrs.type == SEAMLESS_DRRS_SUPPORT) {
 			pipe_config->has_drrs = true;
-			intel_link_compute_m_n(pipe_config->pipe_bpp,
+			intel_link_compute_m_n(pipe_config->pipe_bpp, 0,
 					       pipe_config->lane_count,
 					       intel_connector->panel.downclock_mode->clock,
 					       pipe_config->port_clock,
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 8b71d64ebd9d..e02caedd443c 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -90,7 +90,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
 		}
 	}
 
-	intel_link_compute_m_n(bpp, lane_count,
+	intel_link_compute_m_n(bpp, 0, lane_count,
 			       adjusted_mode->crtc_clock,
 			       pipe_config->port_clock,
 			       &pipe_config->dp_m_n,
-- 
2.18.0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH v6 13/28] drm/i915/dp: Compute DSC pipe config in atomic check

[Ville Syrjälä]

On Wed, Oct 24, 2018 at 03:28:25PM -0700, Manasi Navare wrote:
> DSC params like the enable, compressed bpp, slice count and
> dsc_split are added to the intel_crtc_state. These parameters
> are set based on the requested mode and available link parameters
> during the pipe configuration in atomic check phase.
> These values are then later used to populate the remaining DSC
> and RC parameters before enbaling DSC in atomic commit.
> 
> v9:
> * Rebase on top of drm-tip that now uses fast_narrow config
> for edp (Manasi)
> v8:
> * Check for DSC bpc not 0 (manasi)
> 
> v7:
> * Fix indentation in compute_m_n (Manasi)
> 
> v6 (From Gaurav):
> * Remove function call of intel_dp_compute_dsc_params() and
> invoke intel_dp_compute_dsc_params() in the patch where
> it is defined to fix compilation warning (Gaurav)
> 
> v5:
> Add drm_dsc_cfg in intel_crtc_state (Manasi)
> 
> v4:
> * Rebase on refactoring of intel_dp_compute_config on tip (Manasi)
> * Add a comment why we need to check PSR while enabling DSC (Gaurav)
> 
> v3:
> * Check PPR > max_cdclock to use 2 VDSC instances (Ville)
> 
> v2:
> * Add if-else for eDP/DP (Gaurav)
> 
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c |  20 +++-
>  drivers/gpu/drm/i915/intel_display.h |   3 +-
>  drivers/gpu/drm/i915/intel_dp.c      | 170 ++++++++++++++++++++++-----
>  drivers/gpu/drm/i915/intel_dp_mst.c  |   2 +-
>  4 files changed, 155 insertions(+), 40 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index fe045abb6472..18737bd82b68 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6434,7 +6434,7 @@ static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
>  
>  	pipe_config->fdi_lanes = lane;
>  
> -	intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
> +	intel_link_compute_m_n(pipe_config->pipe_bpp, 0, lane, fdi_dotclock,
>  			       link_bw, &pipe_config->fdi_m_n, false);
>  
>  	ret = ironlake_check_fdi_lanes(dev, intel_crtc->pipe, pipe_config);
> @@ -6671,17 +6671,25 @@ static void compute_m_n(unsigned int m, unsigned int n,
>  }
>  
>  void
> -intel_link_compute_m_n(int bits_per_pixel, int nlanes,
> +intel_link_compute_m_n(int bits_per_pixel, uint16_t compressed_bpp,
> +		       int nlanes,
>  		       int pixel_clock, int link_clock,
>  		       struct intel_link_m_n *m_n,
>  		       bool constant_n)
>  {
>  	m_n->tu = 64;
>  
> -	compute_m_n(bits_per_pixel * pixel_clock,
> -		    link_clock * nlanes * 8,
> -		    &m_n->gmch_m, &m_n->gmch_n,
> -		    constant_n);
> +	/* For DSC, Data M/N calculation uses compressed BPP */
> +	if (compressed_bpp)
> +		compute_m_n(compressed_bpp * pixel_clock,
> +			    link_clock * nlanes * 8,
> +			    &m_n->gmch_m, &m_n->gmch_n,
> +			    constant_n);
> +	else
> +		compute_m_n(bits_per_pixel * pixel_clock,
> +			    link_clock * nlanes * 8,
> +			    &m_n->gmch_m, &m_n->gmch_n,
> +			    constant_n);
>  
>  	compute_m_n(pixel_clock, link_clock,
>  		    &m_n->link_m, &m_n->link_n,
> diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> index 5d50decbcbb5..b0b23e1e9392 100644
> --- a/drivers/gpu/drm/i915/intel_display.h
> +++ b/drivers/gpu/drm/i915/intel_display.h
> @@ -407,7 +407,8 @@ struct intel_link_m_n {
>  	     (__i)++) \
>  		for_each_if(plane)
>  
> -void intel_link_compute_m_n(int bpp, int nlanes,
> +void intel_link_compute_m_n(int bpp, uint16_t compressed_bpp,
> +			    int nlanes,
>  			    int pixel_clock, int link_clock,
>  			    struct intel_link_m_n *m_n,
>  			    bool constant_n);
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 6f66a38ba0b2..a88f9371dd32 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -47,6 +47,8 @@
>  
>  /* DP DSC small joiner has 2 FIFOs each of 640 x 6 bytes */
>  #define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
> +#define DP_DSC_MIN_SUPPORTED_BPC		8
> +#define DP_DSC_MAX_SUPPORTED_BPC		10
>  
>  /* DP DSC throughput values used for slice count calculations KPixels/s */
>  #define DP_DSC_PEAK_PIXEL_RATE			2720000
> @@ -1924,6 +1926,16 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
>  		}
>  	}
>  
> +	/* If DSC is supported, use the max value reported by panel */
> +	if (INTEL_GEN(dev_priv) >= 10 &&
> +	    drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
> +		bpc = min_t(u8,
> +			    drm_dp_dsc_sink_max_color_depth(intel_dp->dsc_dpcd),
> +			    DP_DSC_MAX_SUPPORTED_BPC);
> +		if (bpc)
> +			bpp = 3 * bpc;

This seems like it should be 'bpp = min(bpp, 3*bpc)'. 
Otherwise we may bump the bpp above a limit we already established earlier.

> +	}
> +
>  	return bpp;
>  }
>  
> @@ -1984,14 +1996,11 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
>  				link_clock = intel_dp->common_rates[clock];
>  				link_avail = intel_dp_max_data_rate(link_clock,
>  								    lane_count);
> -
> -				if (mode_rate <= link_avail) {
> -					pipe_config->lane_count = lane_count;
> -					pipe_config->pipe_bpp = bpp;
> -					pipe_config->port_clock = link_clock;
> -
> +				pipe_config->lane_count = lane_count;
> +				pipe_config->pipe_bpp = bpp;
> +				pipe_config->port_clock = link_clock;
> +				if (mode_rate <= link_avail)
>  					return true;

Why do we need to assign these if we don't accept the configuration?

> -				}
>  			}
>  		}
>  	}
> @@ -2020,14 +2029,11 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
>  				link_clock = intel_dp->common_rates[clock];
>  				link_avail = intel_dp_max_data_rate(link_clock,
>  								    lane_count);
> -
> -				if (mode_rate <= link_avail) {
> -					pipe_config->lane_count = lane_count;
> -					pipe_config->pipe_bpp = bpp;
> -					pipe_config->port_clock = link_clock;
> -
> +				pipe_config->lane_count = lane_count;
> +				pipe_config->pipe_bpp = bpp;
> +				pipe_config->port_clock = link_clock;
> +				if (mode_rate <= link_avail)
>  					return true;
> -				}
>  			}
>  		}
>  	}
> @@ -2035,14 +2041,88 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
>  	return false;
>  }
>  
> +static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> +					struct intel_crtc_state *pipe_config,
> +					struct link_config_limits *limits)
> +{
> +	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> +	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> +	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> +	enum pipe pipe = to_intel_crtc(pipe_config->base.crtc)->pipe;
> +	u16 dsc_max_output_bpp = 0;
> +	u8 dsc_dp_slice_count = 0;
> +
> +	if (INTEL_GEN(dev_priv) < 10 ||
> +	    !drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd))
> +		return false;
> +
> +	/* DP DSC only supported on Pipe B and C */
> +	if (pipe == PIPE_A && !intel_dp_is_edp(intel_dp))
> +		return false;

Do we mean 'transcoder == EDP || transcoder == B || transcoder == C' ?
Or maybe 'transcoder != A' for short. I guess this will need to adjusted
for the next platform anyway so making the assumption that transcoder A
is the only one that can't do DSC is fine.

This whole thing seems like a good helper function.
intel_dp_source_supports_dsc() or something like that. And then we
could have intel_dp_supports_dsc() which just calls that +
drm_dp_sink_supports_dsc().

intel_dp_compute_bpp() should use this at least, and probably a few
other places as well.

> +
> +	/* DSC not supported for DSC sink BPC < 8 */
> +	if (limits->max_bpp < 3 * DP_DSC_MIN_SUPPORTED_BPC) {
> +		DRM_DEBUG_KMS("No DSC support for less than 8bpc\n");
> +		return false;
> +	}
> +
> +	if (intel_dp_is_edp(intel_dp)) {
> +		pipe_config->dsc_params.compressed_bpp =
> +			drm_edp_dsc_sink_output_bpp(intel_dp->dsc_dpcd) >> 4;
> +		pipe_config->dsc_params.slice_count =
> +			drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
> +							true);
> +	} else {
> +		dsc_max_output_bpp =
> +			intel_dp_dsc_get_output_bpp(pipe_config->port_clock,
> +						    pipe_config->lane_count,
> +						    adjusted_mode->crtc_clock,
> +						    adjusted_mode->crtc_hdisplay);
> +		dsc_dp_slice_count =
> +			intel_dp_dsc_get_slice_count(intel_dp,
> +						     adjusted_mode->crtc_clock,
> +						     adjusted_mode->crtc_hdisplay);
> +		if (!(dsc_max_output_bpp && dsc_dp_slice_count)) {
> +			DRM_DEBUG_KMS("Compressed BPP/Slice Count not supported\n");
> +			return false;
> +		}
> +		pipe_config->dsc_params.compressed_bpp = dsc_max_output_bpp >> 4;
> +		pipe_config->dsc_params.slice_count = dsc_dp_slice_count;
> +	}
> +	/*
> +	 * VDSC engine operates at 1 Pixel per clock, so if peak pixel rate
> +	 * is greater than the maximum Cdclock and if slice count is even
> +	 * then we need to use 2 VDSC instances.
> +	 */
> +	pipe_config->dsc_params.dsc_split = false;
> +	if (adjusted_mode->crtc_clock > dev_priv->max_cdclk_freq) {
> +		if (pipe_config->dsc_params.slice_count > 1) {
> +			pipe_config->dsc_params.dsc_split = true;
> +		} else {
> +			DRM_DEBUG_KMS("Cannot split stream to use 2 VDSC instances\n");
> +			return false;
> +		}
> +	}
> +	pipe_config->dsc_params.compression_enable = true;
> +	DRM_DEBUG_KMS("DP DSC computed with Input Bpp = %d "
> +		      "Compressed Bpp = %d Slice Count = %d\n",
> +		      pipe_config->pipe_bpp,
> +		      pipe_config->dsc_params.compressed_bpp,
> +		      pipe_config->dsc_params.slice_count);
> +
> +	return true;
> +}
> +
>  static bool
>  intel_dp_compute_link_config(struct intel_encoder *encoder,
>  			     struct intel_crtc_state *pipe_config)
>  {
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>  	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
>  	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
>  	struct link_config_limits limits;
>  	int common_len;
> +	bool ret = false;
>  
>  	common_len = intel_dp_common_len_rate_limit(intel_dp,
>  						    intel_dp->max_link_rate);
> @@ -2056,7 +2136,9 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
>  	limits.min_lane_count = 1;
>  	limits.max_lane_count = intel_dp_max_lane_count(intel_dp);
>  
> -	limits.min_bpp = 6 * 3;
> +	limits.min_bpp = (INTEL_GEN(dev_priv) >= 10 &&
> +			  drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) ?
> +		DP_DSC_MIN_SUPPORTED_BPC * 3 : 6 * 3;
>  	limits.max_bpp = intel_dp_compute_bpp(intel_dp, pipe_config);

Hmm. This now assumes that we will in fact use DSC. I guess we can only
make that assumption when we've determined that DSC is supported and the
max_bpp also allows DSC.

So something like:

max_bpp = intel_dp_compute_bpp();
if (supports_dsc() && max_bpp >= DP_DSC_MIN_SUPPORTED_BPC*3)
	min_bpp = DP_DSC_MIN_SUPPORTED_BPC * 3;
else
	min_bpp = 6 * 3

>  
>  	if (intel_dp_is_edp(intel_dp) && intel_dp->edp_dpcd[0] < DP_EDP_14) {
> @@ -2081,7 +2163,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
>  		      intel_dp->common_rates[limits.max_clock],
>  		      limits.max_bpp, adjusted_mode->crtc_clock);
>  
> -	if (intel_dp_is_edp(intel_dp)) {
> +	if (intel_dp_is_edp(intel_dp))
>  		/*
>  		 * Optimize for fast and narrow. eDP 1.3 section 3.3 and eDP 1.4
>  		 * section A.1: "It is recommended that the minimum number of
> @@ -2091,26 +2173,48 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
>  		 * Note that we use the max clock and lane count for eDP 1.3 and
>  		 * earlier, and fast vs. wide is irrelevant.
>  		 */
> -		if (!intel_dp_compute_link_config_fast(intel_dp, pipe_config,
> -						       &limits))
> -			return false;
> -	} else {
> +		ret = intel_dp_compute_link_config_fast(intel_dp, pipe_config,
> +							&limits);
> +	else
>  		/* Optimize for slow and wide. */
> -		if (!intel_dp_compute_link_config_wide(intel_dp, pipe_config,
> -						       &limits))
> +		ret = intel_dp_compute_link_config_wide(intel_dp, pipe_config,
> +							&limits);
> +
> +	/* enable compression if the mode doesn't fit available BW */
> +	if (!ret) {
> +		DRM_DEBUG_KMS("DP required Link rate %i does not fit available %i\n",
> +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> +						     pipe_config->pipe_bpp),
> +			      intel_dp_max_data_rate(pipe_config->port_clock,
> +						     pipe_config->lane_count));
> +
> +		if (!intel_dp_dsc_compute_config(intel_dp, pipe_config,
> +						 &limits))
>  			return false;
>  	}
>  
> -	DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
> -		      pipe_config->lane_count, pipe_config->port_clock,
> -		      pipe_config->pipe_bpp);
> +	if (pipe_config->dsc_params.compression_enable) {
> +		DRM_DEBUG_KMS("DP lane count %d clock %d Input bpp %d Compressed bpp %d\n",
> +			      pipe_config->lane_count, pipe_config->port_clock,
> +			      pipe_config->pipe_bpp,
> +			      pipe_config->dsc_params.compressed_bpp);
>  
> -	DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> -		      intel_dp_link_required(adjusted_mode->crtc_clock,
> -					     pipe_config->pipe_bpp),
> -		      intel_dp_max_data_rate(pipe_config->port_clock,
> -					     pipe_config->lane_count));
> +		DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> +						     pipe_config->dsc_params.compressed_bpp),
> +			      intel_dp_max_data_rate(pipe_config->port_clock,
> +						     pipe_config->lane_count));
> +	} else {
> +		DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
> +			      pipe_config->lane_count, pipe_config->port_clock,
> +			      pipe_config->pipe_bpp);
>  
> +		DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> +						     pipe_config->pipe_bpp),
> +			      intel_dp_max_data_rate(pipe_config->port_clock,
> +						     pipe_config->lane_count));
> +	}
>  	return true;
>  }
>  
> @@ -2194,7 +2298,9 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>  			intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_LIMITED;
>  	}
>  
> -	intel_link_compute_m_n(pipe_config->pipe_bpp, pipe_config->lane_count,
> +	intel_link_compute_m_n(pipe_config->pipe_bpp,
> +			       pipe_config->dsc_params.compressed_bpp,
> +			       pipe_config->lane_count,
>  			       adjusted_mode->crtc_clock,
>  			       pipe_config->port_clock,
>  			       &pipe_config->dp_m_n,
> @@ -2203,7 +2309,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>  	if (intel_connector->panel.downclock_mode != NULL &&
>  		dev_priv->drrs.type == SEAMLESS_DRRS_SUPPORT) {
>  			pipe_config->has_drrs = true;
> -			intel_link_compute_m_n(pipe_config->pipe_bpp,
> +			intel_link_compute_m_n(pipe_config->pipe_bpp, 0,
>  					       pipe_config->lane_count,
>  					       intel_connector->panel.downclock_mode->clock,
>  					       pipe_config->port_clock,
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> index 8b71d64ebd9d..e02caedd443c 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -90,7 +90,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
>  		}
>  	}
>  
> -	intel_link_compute_m_n(bpp, lane_count,
> +	intel_link_compute_m_n(bpp, 0, lane_count,
>  			       adjusted_mode->crtc_clock,
>  			       pipe_config->port_clock,
>  			       &pipe_config->dp_m_n,
> -- 
> 2.18.0

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 13/28] drm/i915/dp: Compute DSC pipe config in atomic check

[Ville Syrjälä]

On Mon, Oct 29, 2018 at 10:30:39PM +0200, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:25PM -0700, Manasi Navare wrote:
> > DSC params like the enable, compressed bpp, slice count and
> > dsc_split are added to the intel_crtc_state. These parameters
> > are set based on the requested mode and available link parameters
> > during the pipe configuration in atomic check phase.
> > These values are then later used to populate the remaining DSC
> > and RC parameters before enbaling DSC in atomic commit.
> > 
> > v9:
> > * Rebase on top of drm-tip that now uses fast_narrow config
> > for edp (Manasi)
> > v8:
> > * Check for DSC bpc not 0 (manasi)
> > 
> > v7:
> > * Fix indentation in compute_m_n (Manasi)
> > 
> > v6 (From Gaurav):
> > * Remove function call of intel_dp_compute_dsc_params() and
> > invoke intel_dp_compute_dsc_params() in the patch where
> > it is defined to fix compilation warning (Gaurav)
> > 
> > v5:
> > Add drm_dsc_cfg in intel_crtc_state (Manasi)
> > 
> > v4:
> > * Rebase on refactoring of intel_dp_compute_config on tip (Manasi)
> > * Add a comment why we need to check PSR while enabling DSC (Gaurav)
> > 
> > v3:
> > * Check PPR > max_cdclock to use 2 VDSC instances (Ville)
> > 
> > v2:
> > * Add if-else for eDP/DP (Gaurav)
> > 
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_display.c |  20 +++-
> >  drivers/gpu/drm/i915/intel_display.h |   3 +-
> >  drivers/gpu/drm/i915/intel_dp.c      | 170 ++++++++++++++++++++++-----
> >  drivers/gpu/drm/i915/intel_dp_mst.c  |   2 +-
> >  4 files changed, 155 insertions(+), 40 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index fe045abb6472..18737bd82b68 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -6434,7 +6434,7 @@ static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
> >  
> >  	pipe_config->fdi_lanes = lane;
> >  
> > -	intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
> > +	intel_link_compute_m_n(pipe_config->pipe_bpp, 0, lane, fdi_dotclock,
> >  			       link_bw, &pipe_config->fdi_m_n, false);
> >  
> >  	ret = ironlake_check_fdi_lanes(dev, intel_crtc->pipe, pipe_config);
> > @@ -6671,17 +6671,25 @@ static void compute_m_n(unsigned int m, unsigned int n,
> >  }
> >  
> >  void
> > -intel_link_compute_m_n(int bits_per_pixel, int nlanes,
> > +intel_link_compute_m_n(int bits_per_pixel, uint16_t compressed_bpp,
> > +		       int nlanes,
> >  		       int pixel_clock, int link_clock,
> >  		       struct intel_link_m_n *m_n,
> >  		       bool constant_n)
> >  {
> >  	m_n->tu = 64;
> >  
> > -	compute_m_n(bits_per_pixel * pixel_clock,
> > -		    link_clock * nlanes * 8,
> > -		    &m_n->gmch_m, &m_n->gmch_n,
> > -		    constant_n);
> > +	/* For DSC, Data M/N calculation uses compressed BPP */
> > +	if (compressed_bpp)
> > +		compute_m_n(compressed_bpp * pixel_clock,
> > +			    link_clock * nlanes * 8,
> > +			    &m_n->gmch_m, &m_n->gmch_n,
> > +			    constant_n);
> > +	else
> > +		compute_m_n(bits_per_pixel * pixel_clock,
> > +			    link_clock * nlanes * 8,
> > +			    &m_n->gmch_m, &m_n->gmch_n,
> > +			    constant_n);
> >  
> >  	compute_m_n(pixel_clock, link_clock,
> >  		    &m_n->link_m, &m_n->link_n,
> > diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> > index 5d50decbcbb5..b0b23e1e9392 100644
> > --- a/drivers/gpu/drm/i915/intel_display.h
> > +++ b/drivers/gpu/drm/i915/intel_display.h
> > @@ -407,7 +407,8 @@ struct intel_link_m_n {
> >  	     (__i)++) \
> >  		for_each_if(plane)
> >  
> > -void intel_link_compute_m_n(int bpp, int nlanes,
> > +void intel_link_compute_m_n(int bpp, uint16_t compressed_bpp,
> > +			    int nlanes,
> >  			    int pixel_clock, int link_clock,
> >  			    struct intel_link_m_n *m_n,
> >  			    bool constant_n);
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > index 6f66a38ba0b2..a88f9371dd32 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -47,6 +47,8 @@
> >  
> >  /* DP DSC small joiner has 2 FIFOs each of 640 x 6 bytes */
> >  #define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
> > +#define DP_DSC_MIN_SUPPORTED_BPC		8
> > +#define DP_DSC_MAX_SUPPORTED_BPC		10
> >  
> >  /* DP DSC throughput values used for slice count calculations KPixels/s */
> >  #define DP_DSC_PEAK_PIXEL_RATE			2720000
> > @@ -1924,6 +1926,16 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
> >  		}
> >  	}
> >  
> > +	/* If DSC is supported, use the max value reported by panel */
> > +	if (INTEL_GEN(dev_priv) >= 10 &&
> > +	    drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
> > +		bpc = min_t(u8,
> > +			    drm_dp_dsc_sink_max_color_depth(intel_dp->dsc_dpcd),
> > +			    DP_DSC_MAX_SUPPORTED_BPC);
> > +		if (bpc)
> > +			bpp = 3 * bpc;
> 
> This seems like it should be 'bpp = min(bpp, 3*bpc)'. 
> Otherwise we may bump the bpp above a limit we already established earlier.
> 
> > +	}
> > +
> >  	return bpp;
> >  }
> >  
> > @@ -1984,14 +1996,11 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
> >  				link_clock = intel_dp->common_rates[clock];
> >  				link_avail = intel_dp_max_data_rate(link_clock,
> >  								    lane_count);
> > -
> > -				if (mode_rate <= link_avail) {
> > -					pipe_config->lane_count = lane_count;
> > -					pipe_config->pipe_bpp = bpp;
> > -					pipe_config->port_clock = link_clock;
> > -
> > +				pipe_config->lane_count = lane_count;
> > +				pipe_config->pipe_bpp = bpp;
> > +				pipe_config->port_clock = link_clock;
> > +				if (mode_rate <= link_avail)
> >  					return true;
> 
> Why do we need to assign these if we don't accept the configuration?
> 
> > -				}
> >  			}
> >  		}
> >  	}
> > @@ -2020,14 +2029,11 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> >  				link_clock = intel_dp->common_rates[clock];
> >  				link_avail = intel_dp_max_data_rate(link_clock,
> >  								    lane_count);
> > -
> > -				if (mode_rate <= link_avail) {
> > -					pipe_config->lane_count = lane_count;
> > -					pipe_config->pipe_bpp = bpp;
> > -					pipe_config->port_clock = link_clock;
> > -
> > +				pipe_config->lane_count = lane_count;
> > +				pipe_config->pipe_bpp = bpp;
> > +				pipe_config->port_clock = link_clock;
> > +				if (mode_rate <= link_avail)
> >  					return true;
> > -				}
> >  			}
> >  		}
> >  	}
> > @@ -2035,14 +2041,88 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> >  	return false;
> >  }
> >  
> > +static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> > +					struct intel_crtc_state *pipe_config,
> > +					struct link_config_limits *limits)
> > +{
> > +	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > +	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> > +	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> > +	enum pipe pipe = to_intel_crtc(pipe_config->base.crtc)->pipe;
> > +	u16 dsc_max_output_bpp = 0;
> > +	u8 dsc_dp_slice_count = 0;
> > +
> > +	if (INTEL_GEN(dev_priv) < 10 ||
> > +	    !drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd))
> > +		return false;
> > +
> > +	/* DP DSC only supported on Pipe B and C */
> > +	if (pipe == PIPE_A && !intel_dp_is_edp(intel_dp))
> > +		return false;
> 
> Do we mean 'transcoder == EDP || transcoder == B || transcoder == C' ?
> Or maybe 'transcoder != A' for short. I guess this will need to adjusted
> for the next platform anyway so making the assumption that transcoder A
> is the only one that can't do DSC is fine.
> 
> This whole thing seems like a good helper function.
> intel_dp_source_supports_dsc() or something like that. And then we
> could have intel_dp_supports_dsc() which just calls that +
> drm_dp_sink_supports_dsc().

Another confusion about these checks is glk. Some other places seem
to indicate that glk has DSC, but then code like this here doesn't 
accept glk. What's up with that?

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 13/28] drm/i915/dp: Compute DSC pipe config in atomic check

[Manasi Navare]

On Mon, Oct 29, 2018 at 10:34:58PM +0200, Ville Syrjälä wrote:
> On Mon, Oct 29, 2018 at 10:30:39PM +0200, Ville Syrjälä wrote:
> > On Wed, Oct 24, 2018 at 03:28:25PM -0700, Manasi Navare wrote:
> > > DSC params like the enable, compressed bpp, slice count and
> > > dsc_split are added to the intel_crtc_state. These parameters
> > > are set based on the requested mode and available link parameters
> > > during the pipe configuration in atomic check phase.
> > > These values are then later used to populate the remaining DSC
> > > and RC parameters before enbaling DSC in atomic commit.
> > > 
> > > v9:
> > > * Rebase on top of drm-tip that now uses fast_narrow config
> > > for edp (Manasi)
> > > v8:
> > > * Check for DSC bpc not 0 (manasi)
> > > 
> > > v7:
> > > * Fix indentation in compute_m_n (Manasi)
> > > 
> > > v6 (From Gaurav):
> > > * Remove function call of intel_dp_compute_dsc_params() and
> > > invoke intel_dp_compute_dsc_params() in the patch where
> > > it is defined to fix compilation warning (Gaurav)
> > > 
> > > v5:
> > > Add drm_dsc_cfg in intel_crtc_state (Manasi)
> > > 
> > > v4:
> > > * Rebase on refactoring of intel_dp_compute_config on tip (Manasi)
> > > * Add a comment why we need to check PSR while enabling DSC (Gaurav)
> > > 
> > > v3:
> > > * Check PPR > max_cdclock to use 2 VDSC instances (Ville)
> > > 
> > > v2:
> > > * Add if-else for eDP/DP (Gaurav)
> > > 
> > > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/intel_display.c |  20 +++-
> > >  drivers/gpu/drm/i915/intel_display.h |   3 +-
> > >  drivers/gpu/drm/i915/intel_dp.c      | 170 ++++++++++++++++++++++-----
> > >  drivers/gpu/drm/i915/intel_dp_mst.c  |   2 +-
> > >  4 files changed, 155 insertions(+), 40 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > > index fe045abb6472..18737bd82b68 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.c
> > > +++ b/drivers/gpu/drm/i915/intel_display.c
> > > @@ -6434,7 +6434,7 @@ static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
> > >  
> > >  	pipe_config->fdi_lanes = lane;
> > >  
> > > -	intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
> > > +	intel_link_compute_m_n(pipe_config->pipe_bpp, 0, lane, fdi_dotclock,
> > >  			       link_bw, &pipe_config->fdi_m_n, false);
> > >  
> > >  	ret = ironlake_check_fdi_lanes(dev, intel_crtc->pipe, pipe_config);
> > > @@ -6671,17 +6671,25 @@ static void compute_m_n(unsigned int m, unsigned int n,
> > >  }
> > >  
> > >  void
> > > -intel_link_compute_m_n(int bits_per_pixel, int nlanes,
> > > +intel_link_compute_m_n(int bits_per_pixel, uint16_t compressed_bpp,
> > > +		       int nlanes,
> > >  		       int pixel_clock, int link_clock,
> > >  		       struct intel_link_m_n *m_n,
> > >  		       bool constant_n)
> > >  {
> > >  	m_n->tu = 64;
> > >  
> > > -	compute_m_n(bits_per_pixel * pixel_clock,
> > > -		    link_clock * nlanes * 8,
> > > -		    &m_n->gmch_m, &m_n->gmch_n,
> > > -		    constant_n);
> > > +	/* For DSC, Data M/N calculation uses compressed BPP */
> > > +	if (compressed_bpp)
> > > +		compute_m_n(compressed_bpp * pixel_clock,
> > > +			    link_clock * nlanes * 8,
> > > +			    &m_n->gmch_m, &m_n->gmch_n,
> > > +			    constant_n);
> > > +	else
> > > +		compute_m_n(bits_per_pixel * pixel_clock,
> > > +			    link_clock * nlanes * 8,
> > > +			    &m_n->gmch_m, &m_n->gmch_n,
> > > +			    constant_n);
> > >  
> > >  	compute_m_n(pixel_clock, link_clock,
> > >  		    &m_n->link_m, &m_n->link_n,
> > > diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> > > index 5d50decbcbb5..b0b23e1e9392 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.h
> > > +++ b/drivers/gpu/drm/i915/intel_display.h
> > > @@ -407,7 +407,8 @@ struct intel_link_m_n {
> > >  	     (__i)++) \
> > >  		for_each_if(plane)
> > >  
> > > -void intel_link_compute_m_n(int bpp, int nlanes,
> > > +void intel_link_compute_m_n(int bpp, uint16_t compressed_bpp,
> > > +			    int nlanes,
> > >  			    int pixel_clock, int link_clock,
> > >  			    struct intel_link_m_n *m_n,
> > >  			    bool constant_n);
> > > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > > index 6f66a38ba0b2..a88f9371dd32 100644
> > > --- a/drivers/gpu/drm/i915/intel_dp.c
> > > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > > @@ -47,6 +47,8 @@
> > >  
> > >  /* DP DSC small joiner has 2 FIFOs each of 640 x 6 bytes */
> > >  #define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
> > > +#define DP_DSC_MIN_SUPPORTED_BPC		8
> > > +#define DP_DSC_MAX_SUPPORTED_BPC		10
> > >  
> > >  /* DP DSC throughput values used for slice count calculations KPixels/s */
> > >  #define DP_DSC_PEAK_PIXEL_RATE			2720000
> > > @@ -1924,6 +1926,16 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
> > >  		}
> > >  	}
> > >  
> > > +	/* If DSC is supported, use the max value reported by panel */
> > > +	if (INTEL_GEN(dev_priv) >= 10 &&
> > > +	    drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
> > > +		bpc = min_t(u8,
> > > +			    drm_dp_dsc_sink_max_color_depth(intel_dp->dsc_dpcd),
> > > +			    DP_DSC_MAX_SUPPORTED_BPC);
> > > +		if (bpc)
> > > +			bpp = 3 * bpc;
> > 
> > This seems like it should be 'bpp = min(bpp, 3*bpc)'. 
> > Otherwise we may bump the bpp above a limit we already established earlier.
> > 
> > > +	}
> > > +
> > >  	return bpp;
> > >  }
> > >  
> > > @@ -1984,14 +1996,11 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
> > >  				link_clock = intel_dp->common_rates[clock];
> > >  				link_avail = intel_dp_max_data_rate(link_clock,
> > >  								    lane_count);
> > > -
> > > -				if (mode_rate <= link_avail) {
> > > -					pipe_config->lane_count = lane_count;
> > > -					pipe_config->pipe_bpp = bpp;
> > > -					pipe_config->port_clock = link_clock;
> > > -
> > > +				pipe_config->lane_count = lane_count;
> > > +				pipe_config->pipe_bpp = bpp;
> > > +				pipe_config->port_clock = link_clock;
> > > +				if (mode_rate <= link_avail)
> > >  					return true;
> > 
> > Why do we need to assign these if we don't accept the configuration?
> > 
> > > -				}
> > >  			}
> > >  		}
> > >  	}
> > > @@ -2020,14 +2029,11 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> > >  				link_clock = intel_dp->common_rates[clock];
> > >  				link_avail = intel_dp_max_data_rate(link_clock,
> > >  								    lane_count);
> > > -
> > > -				if (mode_rate <= link_avail) {
> > > -					pipe_config->lane_count = lane_count;
> > > -					pipe_config->pipe_bpp = bpp;
> > > -					pipe_config->port_clock = link_clock;
> > > -
> > > +				pipe_config->lane_count = lane_count;
> > > +				pipe_config->pipe_bpp = bpp;
> > > +				pipe_config->port_clock = link_clock;
> > > +				if (mode_rate <= link_avail)
> > >  					return true;
> > > -				}
> > >  			}
> > >  		}
> > >  	}
> > > @@ -2035,14 +2041,88 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> > >  	return false;
> > >  }
> > >  
> > > +static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> > > +					struct intel_crtc_state *pipe_config,
> > > +					struct link_config_limits *limits)
> > > +{
> > > +	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > > +	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> > > +	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> > > +	enum pipe pipe = to_intel_crtc(pipe_config->base.crtc)->pipe;
> > > +	u16 dsc_max_output_bpp = 0;
> > > +	u8 dsc_dp_slice_count = 0;
> > > +
> > > +	if (INTEL_GEN(dev_priv) < 10 ||
> > > +	    !drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd))
> > > +		return false;
> > > +
> > > +	/* DP DSC only supported on Pipe B and C */
> > > +	if (pipe == PIPE_A && !intel_dp_is_edp(intel_dp))
> > > +		return false;
> > 
> > Do we mean 'transcoder == EDP || transcoder == B || transcoder == C' ?
> > Or maybe 'transcoder != A' for short. I guess this will need to adjusted
> > for the next platform anyway so making the assumption that transcoder A
> > is the only one that can't do DSC is fine.
> > 
> > This whole thing seems like a good helper function.
> > intel_dp_source_supports_dsc() or something like that. And then we
> > could have intel_dp_supports_dsc() which just calls that +
> > drm_dp_sink_supports_dsc().
>

So intel_dp_source_supports_dsc will have platform checks, but for it to do
transcoder check it would also need crtc_state as input.

And yes intel_dp_supports_dsc() can call this and drm_dp_sink_supports_dsc()
 
> Another confusion about these checks is glk. Some other places seem
> to indicate that glk has DSC, but then code like this here doesn't 
> accept glk. What's up with that?

This is because on GLK, VDSC is only supported on eDP and not on external DP

Manasi

> 
> -- 
> Ville Syrjälä
> Intel
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Re: [PATCH v6 13/28] drm/i915/dp: Compute DSC pipe config in atomic check

[Ville Syrjälä]

On Mon, Oct 29, 2018 at 04:08:43PM -0700, Manasi Navare wrote:
> On Mon, Oct 29, 2018 at 10:34:58PM +0200, Ville Syrjälä wrote:
> > On Mon, Oct 29, 2018 at 10:30:39PM +0200, Ville Syrjälä wrote:
> > > On Wed, Oct 24, 2018 at 03:28:25PM -0700, Manasi Navare wrote:
> > > > DSC params like the enable, compressed bpp, slice count and
> > > > dsc_split are added to the intel_crtc_state. These parameters
> > > > are set based on the requested mode and available link parameters
> > > > during the pipe configuration in atomic check phase.
> > > > These values are then later used to populate the remaining DSC
> > > > and RC parameters before enbaling DSC in atomic commit.
> > > > 
> > > > v9:
> > > > * Rebase on top of drm-tip that now uses fast_narrow config
> > > > for edp (Manasi)
> > > > v8:
> > > > * Check for DSC bpc not 0 (manasi)
> > > > 
> > > > v7:
> > > > * Fix indentation in compute_m_n (Manasi)
> > > > 
> > > > v6 (From Gaurav):
> > > > * Remove function call of intel_dp_compute_dsc_params() and
> > > > invoke intel_dp_compute_dsc_params() in the patch where
> > > > it is defined to fix compilation warning (Gaurav)
> > > > 
> > > > v5:
> > > > Add drm_dsc_cfg in intel_crtc_state (Manasi)
> > > > 
> > > > v4:
> > > > * Rebase on refactoring of intel_dp_compute_config on tip (Manasi)
> > > > * Add a comment why we need to check PSR while enabling DSC (Gaurav)
> > > > 
> > > > v3:
> > > > * Check PPR > max_cdclock to use 2 VDSC instances (Ville)
> > > > 
> > > > v2:
> > > > * Add if-else for eDP/DP (Gaurav)
> > > > 
> > > > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > > > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > > > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > > > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > > > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > > Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
> > > > ---
> > > >  drivers/gpu/drm/i915/intel_display.c |  20 +++-
> > > >  drivers/gpu/drm/i915/intel_display.h |   3 +-
> > > >  drivers/gpu/drm/i915/intel_dp.c      | 170 ++++++++++++++++++++++-----
> > > >  drivers/gpu/drm/i915/intel_dp_mst.c  |   2 +-
> > > >  4 files changed, 155 insertions(+), 40 deletions(-)
> > > > 
> > > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > > > index fe045abb6472..18737bd82b68 100644
> > > > --- a/drivers/gpu/drm/i915/intel_display.c
> > > > +++ b/drivers/gpu/drm/i915/intel_display.c
> > > > @@ -6434,7 +6434,7 @@ static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
> > > >  
> > > >  	pipe_config->fdi_lanes = lane;
> > > >  
> > > > -	intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
> > > > +	intel_link_compute_m_n(pipe_config->pipe_bpp, 0, lane, fdi_dotclock,
> > > >  			       link_bw, &pipe_config->fdi_m_n, false);
> > > >  
> > > >  	ret = ironlake_check_fdi_lanes(dev, intel_crtc->pipe, pipe_config);
> > > > @@ -6671,17 +6671,25 @@ static void compute_m_n(unsigned int m, unsigned int n,
> > > >  }
> > > >  
> > > >  void
> > > > -intel_link_compute_m_n(int bits_per_pixel, int nlanes,
> > > > +intel_link_compute_m_n(int bits_per_pixel, uint16_t compressed_bpp,
> > > > +		       int nlanes,
> > > >  		       int pixel_clock, int link_clock,
> > > >  		       struct intel_link_m_n *m_n,
> > > >  		       bool constant_n)
> > > >  {
> > > >  	m_n->tu = 64;
> > > >  
> > > > -	compute_m_n(bits_per_pixel * pixel_clock,
> > > > -		    link_clock * nlanes * 8,
> > > > -		    &m_n->gmch_m, &m_n->gmch_n,
> > > > -		    constant_n);
> > > > +	/* For DSC, Data M/N calculation uses compressed BPP */
> > > > +	if (compressed_bpp)
> > > > +		compute_m_n(compressed_bpp * pixel_clock,
> > > > +			    link_clock * nlanes * 8,
> > > > +			    &m_n->gmch_m, &m_n->gmch_n,
> > > > +			    constant_n);
> > > > +	else
> > > > +		compute_m_n(bits_per_pixel * pixel_clock,
> > > > +			    link_clock * nlanes * 8,
> > > > +			    &m_n->gmch_m, &m_n->gmch_n,
> > > > +			    constant_n);
> > > >  
> > > >  	compute_m_n(pixel_clock, link_clock,
> > > >  		    &m_n->link_m, &m_n->link_n,
> > > > diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> > > > index 5d50decbcbb5..b0b23e1e9392 100644
> > > > --- a/drivers/gpu/drm/i915/intel_display.h
> > > > +++ b/drivers/gpu/drm/i915/intel_display.h
> > > > @@ -407,7 +407,8 @@ struct intel_link_m_n {
> > > >  	     (__i)++) \
> > > >  		for_each_if(plane)
> > > >  
> > > > -void intel_link_compute_m_n(int bpp, int nlanes,
> > > > +void intel_link_compute_m_n(int bpp, uint16_t compressed_bpp,
> > > > +			    int nlanes,
> > > >  			    int pixel_clock, int link_clock,
> > > >  			    struct intel_link_m_n *m_n,
> > > >  			    bool constant_n);
> > > > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > > > index 6f66a38ba0b2..a88f9371dd32 100644
> > > > --- a/drivers/gpu/drm/i915/intel_dp.c
> > > > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > > > @@ -47,6 +47,8 @@
> > > >  
> > > >  /* DP DSC small joiner has 2 FIFOs each of 640 x 6 bytes */
> > > >  #define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
> > > > +#define DP_DSC_MIN_SUPPORTED_BPC		8
> > > > +#define DP_DSC_MAX_SUPPORTED_BPC		10
> > > >  
> > > >  /* DP DSC throughput values used for slice count calculations KPixels/s */
> > > >  #define DP_DSC_PEAK_PIXEL_RATE			2720000
> > > > @@ -1924,6 +1926,16 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
> > > >  		}
> > > >  	}
> > > >  
> > > > +	/* If DSC is supported, use the max value reported by panel */
> > > > +	if (INTEL_GEN(dev_priv) >= 10 &&
> > > > +	    drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
> > > > +		bpc = min_t(u8,
> > > > +			    drm_dp_dsc_sink_max_color_depth(intel_dp->dsc_dpcd),
> > > > +			    DP_DSC_MAX_SUPPORTED_BPC);
> > > > +		if (bpc)
> > > > +			bpp = 3 * bpc;
> > > 
> > > This seems like it should be 'bpp = min(bpp, 3*bpc)'. 
> > > Otherwise we may bump the bpp above a limit we already established earlier.
> > > 
> > > > +	}
> > > > +
> > > >  	return bpp;
> > > >  }
> > > >  
> > > > @@ -1984,14 +1996,11 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
> > > >  				link_clock = intel_dp->common_rates[clock];
> > > >  				link_avail = intel_dp_max_data_rate(link_clock,
> > > >  								    lane_count);
> > > > -
> > > > -				if (mode_rate <= link_avail) {
> > > > -					pipe_config->lane_count = lane_count;
> > > > -					pipe_config->pipe_bpp = bpp;
> > > > -					pipe_config->port_clock = link_clock;
> > > > -
> > > > +				pipe_config->lane_count = lane_count;
> > > > +				pipe_config->pipe_bpp = bpp;
> > > > +				pipe_config->port_clock = link_clock;
> > > > +				if (mode_rate <= link_avail)
> > > >  					return true;
> > > 
> > > Why do we need to assign these if we don't accept the configuration?
> > > 
> > > > -				}
> > > >  			}
> > > >  		}
> > > >  	}
> > > > @@ -2020,14 +2029,11 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> > > >  				link_clock = intel_dp->common_rates[clock];
> > > >  				link_avail = intel_dp_max_data_rate(link_clock,
> > > >  								    lane_count);
> > > > -
> > > > -				if (mode_rate <= link_avail) {
> > > > -					pipe_config->lane_count = lane_count;
> > > > -					pipe_config->pipe_bpp = bpp;
> > > > -					pipe_config->port_clock = link_clock;
> > > > -
> > > > +				pipe_config->lane_count = lane_count;
> > > > +				pipe_config->pipe_bpp = bpp;
> > > > +				pipe_config->port_clock = link_clock;
> > > > +				if (mode_rate <= link_avail)
> > > >  					return true;
> > > > -				}
> > > >  			}
> > > >  		}
> > > >  	}
> > > > @@ -2035,14 +2041,88 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> > > >  	return false;
> > > >  }
> > > >  
> > > > +static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> > > > +					struct intel_crtc_state *pipe_config,
> > > > +					struct link_config_limits *limits)
> > > > +{
> > > > +	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > > > +	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> > > > +	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> > > > +	enum pipe pipe = to_intel_crtc(pipe_config->base.crtc)->pipe;
> > > > +	u16 dsc_max_output_bpp = 0;
> > > > +	u8 dsc_dp_slice_count = 0;
> > > > +
> > > > +	if (INTEL_GEN(dev_priv) < 10 ||
> > > > +	    !drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd))
> > > > +		return false;
> > > > +
> > > > +	/* DP DSC only supported on Pipe B and C */
> > > > +	if (pipe == PIPE_A && !intel_dp_is_edp(intel_dp))
> > > > +		return false;
> > > 
> > > Do we mean 'transcoder == EDP || transcoder == B || transcoder == C' ?
> > > Or maybe 'transcoder != A' for short. I guess this will need to adjusted
> > > for the next platform anyway so making the assumption that transcoder A
> > > is the only one that can't do DSC is fine.
> > > 
> > > This whole thing seems like a good helper function.
> > > intel_dp_source_supports_dsc() or something like that. And then we
> > > could have intel_dp_supports_dsc() which just calls that +
> > > drm_dp_sink_supports_dsc().
> >
> 
> So intel_dp_source_supports_dsc will have platform checks, but for it to do
> transcoder check it would also need crtc_state as input.

Indeed. Do we have that in all the places we need this?

> 
> And yes intel_dp_supports_dsc() can call this and drm_dp_sink_supports_dsc()
>  
> > Another confusion about these checks is glk. Some other places seem
> > to indicate that glk has DSC, but then code like this here doesn't 
> > accept glk. What's up with that?
> 
> This is because on GLK, VDSC is only supported on eDP and not on external DP

But we don't consider DSC when computing any of the link params and
whatnot. If that's intentional then there is something rather
non-obvious about how all this is meant to work. I don't think there
really should be that much of a difference between DP and eDP when
it comes to DSC.

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 13/28] drm/i915/dp: Compute DSC pipe config in atomic check

[Manasi Navare]

On Mon, Oct 29, 2018 at 10:30:39PM +0200, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:25PM -0700, Manasi Navare wrote:
> > DSC params like the enable, compressed bpp, slice count and
> > dsc_split are added to the intel_crtc_state. These parameters
> > are set based on the requested mode and available link parameters
> > during the pipe configuration in atomic check phase.
> > These values are then later used to populate the remaining DSC
> > and RC parameters before enbaling DSC in atomic commit.
> > 
> > v9:
> > * Rebase on top of drm-tip that now uses fast_narrow config
> > for edp (Manasi)
> > v8:
> > * Check for DSC bpc not 0 (manasi)
> > 
> > v7:
> > * Fix indentation in compute_m_n (Manasi)
> > 
> > v6 (From Gaurav):
> > * Remove function call of intel_dp_compute_dsc_params() and
> > invoke intel_dp_compute_dsc_params() in the patch where
> > it is defined to fix compilation warning (Gaurav)
> > 
> > v5:
> > Add drm_dsc_cfg in intel_crtc_state (Manasi)
> > 
> > v4:
> > * Rebase on refactoring of intel_dp_compute_config on tip (Manasi)
> > * Add a comment why we need to check PSR while enabling DSC (Gaurav)
> > 
> > v3:
> > * Check PPR > max_cdclock to use 2 VDSC instances (Ville)
> > 
> > v2:
> > * Add if-else for eDP/DP (Gaurav)
> > 
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_display.c |  20 +++-
> >  drivers/gpu/drm/i915/intel_display.h |   3 +-
> >  drivers/gpu/drm/i915/intel_dp.c      | 170 ++++++++++++++++++++++-----
> >  drivers/gpu/drm/i915/intel_dp_mst.c  |   2 +-
> >  4 files changed, 155 insertions(+), 40 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index fe045abb6472..18737bd82b68 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -6434,7 +6434,7 @@ static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
> >  
> >  	pipe_config->fdi_lanes = lane;
> >  
> > -	intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
> > +	intel_link_compute_m_n(pipe_config->pipe_bpp, 0, lane, fdi_dotclock,
> >  			       link_bw, &pipe_config->fdi_m_n, false);
> >  
> >  	ret = ironlake_check_fdi_lanes(dev, intel_crtc->pipe, pipe_config);
> > @@ -6671,17 +6671,25 @@ static void compute_m_n(unsigned int m, unsigned int n,
> >  }
> >  
> >  void
> > -intel_link_compute_m_n(int bits_per_pixel, int nlanes,
> > +intel_link_compute_m_n(int bits_per_pixel, uint16_t compressed_bpp,
> > +		       int nlanes,
> >  		       int pixel_clock, int link_clock,
> >  		       struct intel_link_m_n *m_n,
> >  		       bool constant_n)
> >  {
> >  	m_n->tu = 64;
> >  
> > -	compute_m_n(bits_per_pixel * pixel_clock,
> > -		    link_clock * nlanes * 8,
> > -		    &m_n->gmch_m, &m_n->gmch_n,
> > -		    constant_n);
> > +	/* For DSC, Data M/N calculation uses compressed BPP */
> > +	if (compressed_bpp)
> > +		compute_m_n(compressed_bpp * pixel_clock,
> > +			    link_clock * nlanes * 8,
> > +			    &m_n->gmch_m, &m_n->gmch_n,
> > +			    constant_n);
> > +	else
> > +		compute_m_n(bits_per_pixel * pixel_clock,
> > +			    link_clock * nlanes * 8,
> > +			    &m_n->gmch_m, &m_n->gmch_n,
> > +			    constant_n);
> >  
> >  	compute_m_n(pixel_clock, link_clock,
> >  		    &m_n->link_m, &m_n->link_n,
> > diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> > index 5d50decbcbb5..b0b23e1e9392 100644
> > --- a/drivers/gpu/drm/i915/intel_display.h
> > +++ b/drivers/gpu/drm/i915/intel_display.h
> > @@ -407,7 +407,8 @@ struct intel_link_m_n {
> >  	     (__i)++) \
> >  		for_each_if(plane)
> >  
> > -void intel_link_compute_m_n(int bpp, int nlanes,
> > +void intel_link_compute_m_n(int bpp, uint16_t compressed_bpp,
> > +			    int nlanes,
> >  			    int pixel_clock, int link_clock,
> >  			    struct intel_link_m_n *m_n,
> >  			    bool constant_n);
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > index 6f66a38ba0b2..a88f9371dd32 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -47,6 +47,8 @@
> >  
> >  /* DP DSC small joiner has 2 FIFOs each of 640 x 6 bytes */
> >  #define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
> > +#define DP_DSC_MIN_SUPPORTED_BPC		8
> > +#define DP_DSC_MAX_SUPPORTED_BPC		10
> >  
> >  /* DP DSC throughput values used for slice count calculations KPixels/s */
> >  #define DP_DSC_PEAK_PIXEL_RATE			2720000
> > @@ -1924,6 +1926,16 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
> >  		}
> >  	}
> >  
> > +	/* If DSC is supported, use the max value reported by panel */
> > +	if (INTEL_GEN(dev_priv) >= 10 &&
> > +	    drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
> > +		bpc = min_t(u8,
> > +			    drm_dp_dsc_sink_max_color_depth(intel_dp->dsc_dpcd),
> > +			    DP_DSC_MAX_SUPPORTED_BPC);
> > +		if (bpc)
> > +			bpp = 3 * bpc;
> 
> This seems like it should be 'bpp = min(bpp, 3*bpc)'. 
> Otherwise we may bump the bpp above a limit we already established earlier.

Yes makes sense. Will change this.

Manasi

> 
> > +	}
> > +
> >  	return bpp;
> >  }
> >  
> > @@ -1984,14 +1996,11 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
> >  				link_clock = intel_dp->common_rates[clock];
> >  				link_avail = intel_dp_max_data_rate(link_clock,
> >  								    lane_count);
> > -
> > -				if (mode_rate <= link_avail) {
> > -					pipe_config->lane_count = lane_count;
> > -					pipe_config->pipe_bpp = bpp;
> > -					pipe_config->port_clock = link_clock;
> > -
> > +				pipe_config->lane_count = lane_count;
> > +				pipe_config->pipe_bpp = bpp;
> > +				pipe_config->port_clock = link_clock;
> > +				if (mode_rate <= link_avail)
> >  					return true;
> 
> Why do we need to assign these if we don't accept the configuration?
> 
> > -				}
> >  			}
> >  		}
> >  	}
> > @@ -2020,14 +2029,11 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> >  				link_clock = intel_dp->common_rates[clock];
> >  				link_avail = intel_dp_max_data_rate(link_clock,
> >  								    lane_count);
> > -
> > -				if (mode_rate <= link_avail) {
> > -					pipe_config->lane_count = lane_count;
> > -					pipe_config->pipe_bpp = bpp;
> > -					pipe_config->port_clock = link_clock;
> > -
> > +				pipe_config->lane_count = lane_count;
> > +				pipe_config->pipe_bpp = bpp;
> > +				pipe_config->port_clock = link_clock;
> > +				if (mode_rate <= link_avail)
> >  					return true;
> > -				}
> >  			}
> >  		}
> >  	}
> > @@ -2035,14 +2041,88 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> >  	return false;
> >  }
> >  
> > +static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> > +					struct intel_crtc_state *pipe_config,
> > +					struct link_config_limits *limits)
> > +{
> > +	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > +	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> > +	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> > +	enum pipe pipe = to_intel_crtc(pipe_config->base.crtc)->pipe;
> > +	u16 dsc_max_output_bpp = 0;
> > +	u8 dsc_dp_slice_count = 0;
> > +
> > +	if (INTEL_GEN(dev_priv) < 10 ||
> > +	    !drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd))
> > +		return false;
> > +
> > +	/* DP DSC only supported on Pipe B and C */
> > +	if (pipe == PIPE_A && !intel_dp_is_edp(intel_dp))
> > +		return false;
> 
> Do we mean 'transcoder == EDP || transcoder == B || transcoder == C' ?
> Or maybe 'transcoder != A' for short. I guess this will need to adjusted
> for the next platform anyway so making the assumption that transcoder A
> is the only one that can't do DSC is fine.
> 
> This whole thing seems like a good helper function.
> intel_dp_source_supports_dsc() or something like that. And then we
> could have intel_dp_supports_dsc() which just calls that +
> drm_dp_sink_supports_dsc().
> 
> intel_dp_compute_bpp() should use this at least, and probably a few
> other places as well.
> 
> > +
> > +	/* DSC not supported for DSC sink BPC < 8 */
> > +	if (limits->max_bpp < 3 * DP_DSC_MIN_SUPPORTED_BPC) {
> > +		DRM_DEBUG_KMS("No DSC support for less than 8bpc\n");
> > +		return false;
> > +	}
> > +
> > +	if (intel_dp_is_edp(intel_dp)) {
> > +		pipe_config->dsc_params.compressed_bpp =
> > +			drm_edp_dsc_sink_output_bpp(intel_dp->dsc_dpcd) >> 4;
> > +		pipe_config->dsc_params.slice_count =
> > +			drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
> > +							true);
> > +	} else {
> > +		dsc_max_output_bpp =
> > +			intel_dp_dsc_get_output_bpp(pipe_config->port_clock,
> > +						    pipe_config->lane_count,
> > +						    adjusted_mode->crtc_clock,
> > +						    adjusted_mode->crtc_hdisplay);
> > +		dsc_dp_slice_count =
> > +			intel_dp_dsc_get_slice_count(intel_dp,
> > +						     adjusted_mode->crtc_clock,
> > +						     adjusted_mode->crtc_hdisplay);
> > +		if (!(dsc_max_output_bpp && dsc_dp_slice_count)) {
> > +			DRM_DEBUG_KMS("Compressed BPP/Slice Count not supported\n");
> > +			return false;
> > +		}
> > +		pipe_config->dsc_params.compressed_bpp = dsc_max_output_bpp >> 4;
> > +		pipe_config->dsc_params.slice_count = dsc_dp_slice_count;
> > +	}
> > +	/*
> > +	 * VDSC engine operates at 1 Pixel per clock, so if peak pixel rate
> > +	 * is greater than the maximum Cdclock and if slice count is even
> > +	 * then we need to use 2 VDSC instances.
> > +	 */
> > +	pipe_config->dsc_params.dsc_split = false;
> > +	if (adjusted_mode->crtc_clock > dev_priv->max_cdclk_freq) {
> > +		if (pipe_config->dsc_params.slice_count > 1) {
> > +			pipe_config->dsc_params.dsc_split = true;
> > +		} else {
> > +			DRM_DEBUG_KMS("Cannot split stream to use 2 VDSC instances\n");
> > +			return false;
> > +		}
> > +	}
> > +	pipe_config->dsc_params.compression_enable = true;
> > +	DRM_DEBUG_KMS("DP DSC computed with Input Bpp = %d "
> > +		      "Compressed Bpp = %d Slice Count = %d\n",
> > +		      pipe_config->pipe_bpp,
> > +		      pipe_config->dsc_params.compressed_bpp,
> > +		      pipe_config->dsc_params.slice_count);
> > +
> > +	return true;
> > +}
> > +
> >  static bool
> >  intel_dp_compute_link_config(struct intel_encoder *encoder,
> >  			     struct intel_crtc_state *pipe_config)
> >  {
> > +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> >  	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> >  	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> >  	struct link_config_limits limits;
> >  	int common_len;
> > +	bool ret = false;
> >  
> >  	common_len = intel_dp_common_len_rate_limit(intel_dp,
> >  						    intel_dp->max_link_rate);
> > @@ -2056,7 +2136,9 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
> >  	limits.min_lane_count = 1;
> >  	limits.max_lane_count = intel_dp_max_lane_count(intel_dp);
> >  
> > -	limits.min_bpp = 6 * 3;
> > +	limits.min_bpp = (INTEL_GEN(dev_priv) >= 10 &&
> > +			  drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) ?
> > +		DP_DSC_MIN_SUPPORTED_BPC * 3 : 6 * 3;
> >  	limits.max_bpp = intel_dp_compute_bpp(intel_dp, pipe_config);
> 
> Hmm. This now assumes that we will in fact use DSC. I guess we can only
> make that assumption when we've determined that DSC is supported and the
> max_bpp also allows DSC.
> 
> So something like:
> 
> max_bpp = intel_dp_compute_bpp();
> if (supports_dsc() && max_bpp >= DP_DSC_MIN_SUPPORTED_BPC*3)
> 	min_bpp = DP_DSC_MIN_SUPPORTED_BPC * 3;
> else
> 	min_bpp = 6 * 3
> 
> >  
> >  	if (intel_dp_is_edp(intel_dp) && intel_dp->edp_dpcd[0] < DP_EDP_14) {
> > @@ -2081,7 +2163,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
> >  		      intel_dp->common_rates[limits.max_clock],
> >  		      limits.max_bpp, adjusted_mode->crtc_clock);
> >  
> > -	if (intel_dp_is_edp(intel_dp)) {
> > +	if (intel_dp_is_edp(intel_dp))
> >  		/*
> >  		 * Optimize for fast and narrow. eDP 1.3 section 3.3 and eDP 1.4
> >  		 * section A.1: "It is recommended that the minimum number of
> > @@ -2091,26 +2173,48 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
> >  		 * Note that we use the max clock and lane count for eDP 1.3 and
> >  		 * earlier, and fast vs. wide is irrelevant.
> >  		 */
> > -		if (!intel_dp_compute_link_config_fast(intel_dp, pipe_config,
> > -						       &limits))
> > -			return false;
> > -	} else {
> > +		ret = intel_dp_compute_link_config_fast(intel_dp, pipe_config,
> > +							&limits);
> > +	else
> >  		/* Optimize for slow and wide. */
> > -		if (!intel_dp_compute_link_config_wide(intel_dp, pipe_config,
> > -						       &limits))
> > +		ret = intel_dp_compute_link_config_wide(intel_dp, pipe_config,
> > +							&limits);
> > +
> > +	/* enable compression if the mode doesn't fit available BW */
> > +	if (!ret) {
> > +		DRM_DEBUG_KMS("DP required Link rate %i does not fit available %i\n",
> > +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> > +						     pipe_config->pipe_bpp),
> > +			      intel_dp_max_data_rate(pipe_config->port_clock,
> > +						     pipe_config->lane_count));
> > +
> > +		if (!intel_dp_dsc_compute_config(intel_dp, pipe_config,
> > +						 &limits))
> >  			return false;
> >  	}
> >  
> > -	DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
> > -		      pipe_config->lane_count, pipe_config->port_clock,
> > -		      pipe_config->pipe_bpp);
> > +	if (pipe_config->dsc_params.compression_enable) {
> > +		DRM_DEBUG_KMS("DP lane count %d clock %d Input bpp %d Compressed bpp %d\n",
> > +			      pipe_config->lane_count, pipe_config->port_clock,
> > +			      pipe_config->pipe_bpp,
> > +			      pipe_config->dsc_params.compressed_bpp);
> >  
> > -	DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> > -		      intel_dp_link_required(adjusted_mode->crtc_clock,
> > -					     pipe_config->pipe_bpp),
> > -		      intel_dp_max_data_rate(pipe_config->port_clock,
> > -					     pipe_config->lane_count));
> > +		DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> > +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> > +						     pipe_config->dsc_params.compressed_bpp),
> > +			      intel_dp_max_data_rate(pipe_config->port_clock,
> > +						     pipe_config->lane_count));
> > +	} else {
> > +		DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
> > +			      pipe_config->lane_count, pipe_config->port_clock,
> > +			      pipe_config->pipe_bpp);
> >  
> > +		DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> > +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> > +						     pipe_config->pipe_bpp),
> > +			      intel_dp_max_data_rate(pipe_config->port_clock,
> > +						     pipe_config->lane_count));
> > +	}
> >  	return true;
> >  }
> >  
> > @@ -2194,7 +2298,9 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> >  			intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_LIMITED;
> >  	}
> >  
> > -	intel_link_compute_m_n(pipe_config->pipe_bpp, pipe_config->lane_count,
> > +	intel_link_compute_m_n(pipe_config->pipe_bpp,
> > +			       pipe_config->dsc_params.compressed_bpp,
> > +			       pipe_config->lane_count,
> >  			       adjusted_mode->crtc_clock,
> >  			       pipe_config->port_clock,
> >  			       &pipe_config->dp_m_n,
> > @@ -2203,7 +2309,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> >  	if (intel_connector->panel.downclock_mode != NULL &&
> >  		dev_priv->drrs.type == SEAMLESS_DRRS_SUPPORT) {
> >  			pipe_config->has_drrs = true;
> > -			intel_link_compute_m_n(pipe_config->pipe_bpp,
> > +			intel_link_compute_m_n(pipe_config->pipe_bpp, 0,
> >  					       pipe_config->lane_count,
> >  					       intel_connector->panel.downclock_mode->clock,
> >  					       pipe_config->port_clock,
> > diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> > index 8b71d64ebd9d..e02caedd443c 100644
> > --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> > +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> > @@ -90,7 +90,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
> >  		}
> >  	}
> >  
> > -	intel_link_compute_m_n(bpp, lane_count,
> > +	intel_link_compute_m_n(bpp, 0, lane_count,
> >  			       adjusted_mode->crtc_clock,
> >  			       pipe_config->port_clock,
> >  			       &pipe_config->dp_m_n,
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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Re: [PATCH v6 13/28] drm/i915/dp: Compute DSC pipe config in atomic check

[Manasi Navare]

On Mon, Oct 29, 2018 at 10:30:39PM +0200, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:25PM -0700, Manasi Navare wrote:
> > DSC params like the enable, compressed bpp, slice count and
> > dsc_split are added to the intel_crtc_state. These parameters
> > are set based on the requested mode and available link parameters
> > during the pipe configuration in atomic check phase.
> > These values are then later used to populate the remaining DSC
> > and RC parameters before enbaling DSC in atomic commit.
> > 
> > v9:
> > * Rebase on top of drm-tip that now uses fast_narrow config
> > for edp (Manasi)
> > v8:
> > * Check for DSC bpc not 0 (manasi)
> > 
> > v7:
> > * Fix indentation in compute_m_n (Manasi)
> > 
> > v6 (From Gaurav):
> > * Remove function call of intel_dp_compute_dsc_params() and
> > invoke intel_dp_compute_dsc_params() in the patch where
> > it is defined to fix compilation warning (Gaurav)
> > 
> > v5:
> > Add drm_dsc_cfg in intel_crtc_state (Manasi)
> > 
> > v4:
> > * Rebase on refactoring of intel_dp_compute_config on tip (Manasi)
> > * Add a comment why we need to check PSR while enabling DSC (Gaurav)
> > 
> > v3:
> > * Check PPR > max_cdclock to use 2 VDSC instances (Ville)
> > 
> > v2:
> > * Add if-else for eDP/DP (Gaurav)
> > 
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_display.c |  20 +++-
> >  drivers/gpu/drm/i915/intel_display.h |   3 +-
> >  drivers/gpu/drm/i915/intel_dp.c      | 170 ++++++++++++++++++++++-----
> >  drivers/gpu/drm/i915/intel_dp_mst.c  |   2 +-
> >  4 files changed, 155 insertions(+), 40 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index fe045abb6472..18737bd82b68 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -6434,7 +6434,7 @@ static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
> >  
> >  	pipe_config->fdi_lanes = lane;
> >  
> > -	intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
> > +	intel_link_compute_m_n(pipe_config->pipe_bpp, 0, lane, fdi_dotclock,
> >  			       link_bw, &pipe_config->fdi_m_n, false);
> >  
> >  	ret = ironlake_check_fdi_lanes(dev, intel_crtc->pipe, pipe_config);
> > @@ -6671,17 +6671,25 @@ static void compute_m_n(unsigned int m, unsigned int n,
> >  }
> >  
> >  void
> > -intel_link_compute_m_n(int bits_per_pixel, int nlanes,
> > +intel_link_compute_m_n(int bits_per_pixel, uint16_t compressed_bpp,
> > +		       int nlanes,
> >  		       int pixel_clock, int link_clock,
> >  		       struct intel_link_m_n *m_n,
> >  		       bool constant_n)
> >  {
> >  	m_n->tu = 64;
> >  
> > -	compute_m_n(bits_per_pixel * pixel_clock,
> > -		    link_clock * nlanes * 8,
> > -		    &m_n->gmch_m, &m_n->gmch_n,
> > -		    constant_n);
> > +	/* For DSC, Data M/N calculation uses compressed BPP */
> > +	if (compressed_bpp)
> > +		compute_m_n(compressed_bpp * pixel_clock,
> > +			    link_clock * nlanes * 8,
> > +			    &m_n->gmch_m, &m_n->gmch_n,
> > +			    constant_n);
> > +	else
> > +		compute_m_n(bits_per_pixel * pixel_clock,
> > +			    link_clock * nlanes * 8,
> > +			    &m_n->gmch_m, &m_n->gmch_n,
> > +			    constant_n);
> >  
> >  	compute_m_n(pixel_clock, link_clock,
> >  		    &m_n->link_m, &m_n->link_n,
> > diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> > index 5d50decbcbb5..b0b23e1e9392 100644
> > --- a/drivers/gpu/drm/i915/intel_display.h
> > +++ b/drivers/gpu/drm/i915/intel_display.h
> > @@ -407,7 +407,8 @@ struct intel_link_m_n {
> >  	     (__i)++) \
> >  		for_each_if(plane)
> >  
> > -void intel_link_compute_m_n(int bpp, int nlanes,
> > +void intel_link_compute_m_n(int bpp, uint16_t compressed_bpp,
> > +			    int nlanes,
> >  			    int pixel_clock, int link_clock,
> >  			    struct intel_link_m_n *m_n,
> >  			    bool constant_n);
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > index 6f66a38ba0b2..a88f9371dd32 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -47,6 +47,8 @@
> >  
> >  /* DP DSC small joiner has 2 FIFOs each of 640 x 6 bytes */
> >  #define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
> > +#define DP_DSC_MIN_SUPPORTED_BPC		8
> > +#define DP_DSC_MAX_SUPPORTED_BPC		10
> >  
> >  /* DP DSC throughput values used for slice count calculations KPixels/s */
> >  #define DP_DSC_PEAK_PIXEL_RATE			2720000
> > @@ -1924,6 +1926,16 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
> >  		}
> >  	}
> >  
> > +	/* If DSC is supported, use the max value reported by panel */
> > +	if (INTEL_GEN(dev_priv) >= 10 &&
> > +	    drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
> > +		bpc = min_t(u8,
> > +			    drm_dp_dsc_sink_max_color_depth(intel_dp->dsc_dpcd),
> > +			    DP_DSC_MAX_SUPPORTED_BPC);
> > +		if (bpc)
> > +			bpp = 3 * bpc;
> 
> This seems like it should be 'bpp = min(bpp, 3*bpc)'. 
> Otherwise we may bump the bpp above a limit we already established earlier.
>

Yes will make this change.
 
> > +	}
> > +
> >  	return bpp;
> >  }
> >  
> > @@ -1984,14 +1996,11 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
> >  				link_clock = intel_dp->common_rates[clock];
> >  				link_avail = intel_dp_max_data_rate(link_clock,
> >  								    lane_count);
> > -
> > -				if (mode_rate <= link_avail) {
> > -					pipe_config->lane_count = lane_count;
> > -					pipe_config->pipe_bpp = bpp;
> > -					pipe_config->port_clock = link_clock;
> > -
> > +				pipe_config->lane_count = lane_count;
> > +				pipe_config->pipe_bpp = bpp;
> > +				pipe_config->port_clock = link_clock;
> > +				if (mode_rate <= link_avail)
> >  					return true;
> 
> Why do we need to assign these if we don't accept the configuration?

We need to assign them because in case of failure, we use them to then configure DSC parameters
in intel_dp_dsc_compute_config().
Previously we were just returning a failure if this failed and so we need not ssign them. But now
in case this fails, we try the DSC compute config.

> 
> > -				}
> >  			}
> >  		}
> >  	}
> > @@ -2020,14 +2029,11 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> >  				link_clock = intel_dp->common_rates[clock];
> >  				link_avail = intel_dp_max_data_rate(link_clock,
> >  								    lane_count);
> > -
> > -				if (mode_rate <= link_avail) {
> > -					pipe_config->lane_count = lane_count;
> > -					pipe_config->pipe_bpp = bpp;
> > -					pipe_config->port_clock = link_clock;
> > -
> > +				pipe_config->lane_count = lane_count;
> > +				pipe_config->pipe_bpp = bpp;
> > +				pipe_config->port_clock = link_clock;
> > +				if (mode_rate <= link_avail)
> >  					return true;
> > -				}
> >  			}
> >  		}
> >  	}
> > @@ -2035,14 +2041,88 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> >  	return false;
> >  }
> >  
> > +static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> > +					struct intel_crtc_state *pipe_config,
> > +					struct link_config_limits *limits)
> > +{
> > +	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > +	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> > +	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> > +	enum pipe pipe = to_intel_crtc(pipe_config->base.crtc)->pipe;
> > +	u16 dsc_max_output_bpp = 0;
> > +	u8 dsc_dp_slice_count = 0;
> > +
> > +	if (INTEL_GEN(dev_priv) < 10 ||
> > +	    !drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd))
> > +		return false;
> > +
> > +	/* DP DSC only supported on Pipe B and C */
> > +	if (pipe == PIPE_A && !intel_dp_is_edp(intel_dp))
> > +		return false;
> 
> Do we mean 'transcoder == EDP || transcoder == B || transcoder == C' ?
> Or maybe 'transcoder != A' for short. I guess this will need to adjusted
> for the next platform anyway so making the assumption that transcoder A
> is the only one that can't do DSC is fine.

Yes the mode I am trying to reject is in case of a NUC, where there is no edp, the first
DP connection will use Pipe A and transcoder A which does not support DSC. So reject it.
So yea I guess I could just check for transcoder == A , then reject.

> 
> This whole thing seems like a good helper function.
> intel_dp_source_supports_dsc() or something like that. And then we
> could have intel_dp_supports_dsc() which just calls that +
> drm_dp_sink_supports_dsc().
> 
> intel_dp_compute_bpp() should use this at least, and probably a few
> other places as well.
> 
> > +
> > +	/* DSC not supported for DSC sink BPC < 8 */
> > +	if (limits->max_bpp < 3 * DP_DSC_MIN_SUPPORTED_BPC) {
> > +		DRM_DEBUG_KMS("No DSC support for less than 8bpc\n");
> > +		return false;
> > +	}
> > +
> > +	if (intel_dp_is_edp(intel_dp)) {
> > +		pipe_config->dsc_params.compressed_bpp =
> > +			drm_edp_dsc_sink_output_bpp(intel_dp->dsc_dpcd) >> 4;
> > +		pipe_config->dsc_params.slice_count =
> > +			drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
> > +							true);
> > +	} else {
> > +		dsc_max_output_bpp =
> > +			intel_dp_dsc_get_output_bpp(pipe_config->port_clock,
> > +						    pipe_config->lane_count,
> > +						    adjusted_mode->crtc_clock,
> > +						    adjusted_mode->crtc_hdisplay);
> > +		dsc_dp_slice_count =
> > +			intel_dp_dsc_get_slice_count(intel_dp,
> > +						     adjusted_mode->crtc_clock,
> > +						     adjusted_mode->crtc_hdisplay);
> > +		if (!(dsc_max_output_bpp && dsc_dp_slice_count)) {
> > +			DRM_DEBUG_KMS("Compressed BPP/Slice Count not supported\n");
> > +			return false;
> > +		}
> > +		pipe_config->dsc_params.compressed_bpp = dsc_max_output_bpp >> 4;
> > +		pipe_config->dsc_params.slice_count = dsc_dp_slice_count;
> > +	}
> > +	/*
> > +	 * VDSC engine operates at 1 Pixel per clock, so if peak pixel rate
> > +	 * is greater than the maximum Cdclock and if slice count is even
> > +	 * then we need to use 2 VDSC instances.
> > +	 */
> > +	pipe_config->dsc_params.dsc_split = false;
> > +	if (adjusted_mode->crtc_clock > dev_priv->max_cdclk_freq) {
> > +		if (pipe_config->dsc_params.slice_count > 1) {
> > +			pipe_config->dsc_params.dsc_split = true;
> > +		} else {
> > +			DRM_DEBUG_KMS("Cannot split stream to use 2 VDSC instances\n");
> > +			return false;
> > +		}
> > +	}
> > +	pipe_config->dsc_params.compression_enable = true;
> > +	DRM_DEBUG_KMS("DP DSC computed with Input Bpp = %d "
> > +		      "Compressed Bpp = %d Slice Count = %d\n",
> > +		      pipe_config->pipe_bpp,
> > +		      pipe_config->dsc_params.compressed_bpp,
> > +		      pipe_config->dsc_params.slice_count);
> > +
> > +	return true;
> > +}
> > +
> >  static bool
> >  intel_dp_compute_link_config(struct intel_encoder *encoder,
> >  			     struct intel_crtc_state *pipe_config)
> >  {
> > +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> >  	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> >  	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> >  	struct link_config_limits limits;
> >  	int common_len;
> > +	bool ret = false;
> >  
> >  	common_len = intel_dp_common_len_rate_limit(intel_dp,
> >  						    intel_dp->max_link_rate);
> > @@ -2056,7 +2136,9 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
> >  	limits.min_lane_count = 1;
> >  	limits.max_lane_count = intel_dp_max_lane_count(intel_dp);
> >  
> > -	limits.min_bpp = 6 * 3;
> > +	limits.min_bpp = (INTEL_GEN(dev_priv) >= 10 &&
> > +			  drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) ?
> > +		DP_DSC_MIN_SUPPORTED_BPC * 3 : 6 * 3;
> >  	limits.max_bpp = intel_dp_compute_bpp(intel_dp, pipe_config);
> 
> Hmm. This now assumes that we will in fact use DSC. I guess we can only
> make that assumption when we've determined that DSC is supported and the
> max_bpp also allows DSC.

But the intel_dp_compute_bpp does check for supports_dsc so that
should be fine. But for min_bpp yes I could use the below logic.
And may be move that to a helper?

Manasi


> 
> So something like:
> 
> max_bpp = intel_dp_compute_bpp();
> if (supports_dsc() && max_bpp >= DP_DSC_MIN_SUPPORTED_BPC*3)
> 	min_bpp = DP_DSC_MIN_SUPPORTED_BPC * 3;
> else
> 	min_bpp = 6 * 3
> 
> >  
> >  	if (intel_dp_is_edp(intel_dp) && intel_dp->edp_dpcd[0] < DP_EDP_14) {
> > @@ -2081,7 +2163,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
> >  		      intel_dp->common_rates[limits.max_clock],
> >  		      limits.max_bpp, adjusted_mode->crtc_clock);
> >  
> > -	if (intel_dp_is_edp(intel_dp)) {
> > +	if (intel_dp_is_edp(intel_dp))
> >  		/*
> >  		 * Optimize for fast and narrow. eDP 1.3 section 3.3 and eDP 1.4
> >  		 * section A.1: "It is recommended that the minimum number of
> > @@ -2091,26 +2173,48 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
> >  		 * Note that we use the max clock and lane count for eDP 1.3 and
> >  		 * earlier, and fast vs. wide is irrelevant.
> >  		 */
> > -		if (!intel_dp_compute_link_config_fast(intel_dp, pipe_config,
> > -						       &limits))
> > -			return false;
> > -	} else {
> > +		ret = intel_dp_compute_link_config_fast(intel_dp, pipe_config,
> > +							&limits);
> > +	else
> >  		/* Optimize for slow and wide. */
> > -		if (!intel_dp_compute_link_config_wide(intel_dp, pipe_config,
> > -						       &limits))
> > +		ret = intel_dp_compute_link_config_wide(intel_dp, pipe_config,
> > +							&limits);
> > +
> > +	/* enable compression if the mode doesn't fit available BW */
> > +	if (!ret) {
> > +		DRM_DEBUG_KMS("DP required Link rate %i does not fit available %i\n",
> > +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> > +						     pipe_config->pipe_bpp),
> > +			      intel_dp_max_data_rate(pipe_config->port_clock,
> > +						     pipe_config->lane_count));
> > +
> > +		if (!intel_dp_dsc_compute_config(intel_dp, pipe_config,
> > +						 &limits))
> >  			return false;
> >  	}
> >  
> > -	DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
> > -		      pipe_config->lane_count, pipe_config->port_clock,
> > -		      pipe_config->pipe_bpp);
> > +	if (pipe_config->dsc_params.compression_enable) {
> > +		DRM_DEBUG_KMS("DP lane count %d clock %d Input bpp %d Compressed bpp %d\n",
> > +			      pipe_config->lane_count, pipe_config->port_clock,
> > +			      pipe_config->pipe_bpp,
> > +			      pipe_config->dsc_params.compressed_bpp);
> >  
> > -	DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> > -		      intel_dp_link_required(adjusted_mode->crtc_clock,
> > -					     pipe_config->pipe_bpp),
> > -		      intel_dp_max_data_rate(pipe_config->port_clock,
> > -					     pipe_config->lane_count));
> > +		DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> > +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> > +						     pipe_config->dsc_params.compressed_bpp),
> > +			      intel_dp_max_data_rate(pipe_config->port_clock,
> > +						     pipe_config->lane_count));
> > +	} else {
> > +		DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
> > +			      pipe_config->lane_count, pipe_config->port_clock,
> > +			      pipe_config->pipe_bpp);
> >  
> > +		DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> > +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> > +						     pipe_config->pipe_bpp),
> > +			      intel_dp_max_data_rate(pipe_config->port_clock,
> > +						     pipe_config->lane_count));
> > +	}
> >  	return true;
> >  }
> >  
> > @@ -2194,7 +2298,9 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> >  			intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_LIMITED;
> >  	}
> >  
> > -	intel_link_compute_m_n(pipe_config->pipe_bpp, pipe_config->lane_count,
> > +	intel_link_compute_m_n(pipe_config->pipe_bpp,
> > +			       pipe_config->dsc_params.compressed_bpp,
> > +			       pipe_config->lane_count,
> >  			       adjusted_mode->crtc_clock,
> >  			       pipe_config->port_clock,
> >  			       &pipe_config->dp_m_n,
> > @@ -2203,7 +2309,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> >  	if (intel_connector->panel.downclock_mode != NULL &&
> >  		dev_priv->drrs.type == SEAMLESS_DRRS_SUPPORT) {
> >  			pipe_config->has_drrs = true;
> > -			intel_link_compute_m_n(pipe_config->pipe_bpp,
> > +			intel_link_compute_m_n(pipe_config->pipe_bpp, 0,
> >  					       pipe_config->lane_count,
> >  					       intel_connector->panel.downclock_mode->clock,
> >  					       pipe_config->port_clock,
> > diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> > index 8b71d64ebd9d..e02caedd443c 100644
> > --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> > +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> > @@ -90,7 +90,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
> >  		}
> >  	}
> >  
> > -	intel_link_compute_m_n(bpp, lane_count,
> > +	intel_link_compute_m_n(bpp, 0, lane_count,
> >  			       adjusted_mode->crtc_clock,
> >  			       pipe_config->port_clock,
> >  			       &pipe_config->dp_m_n,
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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Re: [PATCH v6 13/28] drm/i915/dp: Compute DSC pipe config in atomic check

[Ville Syrjälä]

On Mon, Oct 29, 2018 at 03:12:51PM -0700, Manasi Navare wrote:
> On Mon, Oct 29, 2018 at 10:30:39PM +0200, Ville Syrjälä wrote:
> > On Wed, Oct 24, 2018 at 03:28:25PM -0700, Manasi Navare wrote:
> > > DSC params like the enable, compressed bpp, slice count and
> > > dsc_split are added to the intel_crtc_state. These parameters
> > > are set based on the requested mode and available link parameters
> > > during the pipe configuration in atomic check phase.
> > > These values are then later used to populate the remaining DSC
> > > and RC parameters before enbaling DSC in atomic commit.
> > > 
> > > v9:
> > > * Rebase on top of drm-tip that now uses fast_narrow config
> > > for edp (Manasi)
> > > v8:
> > > * Check for DSC bpc not 0 (manasi)
> > > 
> > > v7:
> > > * Fix indentation in compute_m_n (Manasi)
> > > 
> > > v6 (From Gaurav):
> > > * Remove function call of intel_dp_compute_dsc_params() and
> > > invoke intel_dp_compute_dsc_params() in the patch where
> > > it is defined to fix compilation warning (Gaurav)
> > > 
> > > v5:
> > > Add drm_dsc_cfg in intel_crtc_state (Manasi)
> > > 
> > > v4:
> > > * Rebase on refactoring of intel_dp_compute_config on tip (Manasi)
> > > * Add a comment why we need to check PSR while enabling DSC (Gaurav)
> > > 
> > > v3:
> > > * Check PPR > max_cdclock to use 2 VDSC instances (Ville)
> > > 
> > > v2:
> > > * Add if-else for eDP/DP (Gaurav)
> > > 
> > > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/intel_display.c |  20 +++-
> > >  drivers/gpu/drm/i915/intel_display.h |   3 +-
> > >  drivers/gpu/drm/i915/intel_dp.c      | 170 ++++++++++++++++++++++-----
> > >  drivers/gpu/drm/i915/intel_dp_mst.c  |   2 +-
> > >  4 files changed, 155 insertions(+), 40 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > > index fe045abb6472..18737bd82b68 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.c
> > > +++ b/drivers/gpu/drm/i915/intel_display.c
> > > @@ -6434,7 +6434,7 @@ static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
> > >  
> > >  	pipe_config->fdi_lanes = lane;
> > >  
> > > -	intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
> > > +	intel_link_compute_m_n(pipe_config->pipe_bpp, 0, lane, fdi_dotclock,
> > >  			       link_bw, &pipe_config->fdi_m_n, false);
> > >  
> > >  	ret = ironlake_check_fdi_lanes(dev, intel_crtc->pipe, pipe_config);
> > > @@ -6671,17 +6671,25 @@ static void compute_m_n(unsigned int m, unsigned int n,
> > >  }
> > >  
> > >  void
> > > -intel_link_compute_m_n(int bits_per_pixel, int nlanes,
> > > +intel_link_compute_m_n(int bits_per_pixel, uint16_t compressed_bpp,
> > > +		       int nlanes,
> > >  		       int pixel_clock, int link_clock,
> > >  		       struct intel_link_m_n *m_n,
> > >  		       bool constant_n)
> > >  {
> > >  	m_n->tu = 64;
> > >  
> > > -	compute_m_n(bits_per_pixel * pixel_clock,
> > > -		    link_clock * nlanes * 8,
> > > -		    &m_n->gmch_m, &m_n->gmch_n,
> > > -		    constant_n);
> > > +	/* For DSC, Data M/N calculation uses compressed BPP */
> > > +	if (compressed_bpp)
> > > +		compute_m_n(compressed_bpp * pixel_clock,
> > > +			    link_clock * nlanes * 8,
> > > +			    &m_n->gmch_m, &m_n->gmch_n,
> > > +			    constant_n);
> > > +	else
> > > +		compute_m_n(bits_per_pixel * pixel_clock,
> > > +			    link_clock * nlanes * 8,
> > > +			    &m_n->gmch_m, &m_n->gmch_n,
> > > +			    constant_n);
> > >  
> > >  	compute_m_n(pixel_clock, link_clock,
> > >  		    &m_n->link_m, &m_n->link_n,
> > > diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> > > index 5d50decbcbb5..b0b23e1e9392 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.h
> > > +++ b/drivers/gpu/drm/i915/intel_display.h
> > > @@ -407,7 +407,8 @@ struct intel_link_m_n {
> > >  	     (__i)++) \
> > >  		for_each_if(plane)
> > >  
> > > -void intel_link_compute_m_n(int bpp, int nlanes,
> > > +void intel_link_compute_m_n(int bpp, uint16_t compressed_bpp,
> > > +			    int nlanes,
> > >  			    int pixel_clock, int link_clock,
> > >  			    struct intel_link_m_n *m_n,
> > >  			    bool constant_n);
> > > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > > index 6f66a38ba0b2..a88f9371dd32 100644
> > > --- a/drivers/gpu/drm/i915/intel_dp.c
> > > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > > @@ -47,6 +47,8 @@
> > >  
> > >  /* DP DSC small joiner has 2 FIFOs each of 640 x 6 bytes */
> > >  #define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
> > > +#define DP_DSC_MIN_SUPPORTED_BPC		8
> > > +#define DP_DSC_MAX_SUPPORTED_BPC		10
> > >  
> > >  /* DP DSC throughput values used for slice count calculations KPixels/s */
> > >  #define DP_DSC_PEAK_PIXEL_RATE			2720000
> > > @@ -1924,6 +1926,16 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
> > >  		}
> > >  	}
> > >  
> > > +	/* If DSC is supported, use the max value reported by panel */
> > > +	if (INTEL_GEN(dev_priv) >= 10 &&
> > > +	    drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
> > > +		bpc = min_t(u8,
> > > +			    drm_dp_dsc_sink_max_color_depth(intel_dp->dsc_dpcd),
> > > +			    DP_DSC_MAX_SUPPORTED_BPC);
> > > +		if (bpc)
> > > +			bpp = 3 * bpc;
> > 
> > This seems like it should be 'bpp = min(bpp, 3*bpc)'. 
> > Otherwise we may bump the bpp above a limit we already established earlier.
> >
> 
> Yes will make this change.
>  
> > > +	}
> > > +
> > >  	return bpp;
> > >  }
> > >  
> > > @@ -1984,14 +1996,11 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
> > >  				link_clock = intel_dp->common_rates[clock];
> > >  				link_avail = intel_dp_max_data_rate(link_clock,
> > >  								    lane_count);
> > > -
> > > -				if (mode_rate <= link_avail) {
> > > -					pipe_config->lane_count = lane_count;
> > > -					pipe_config->pipe_bpp = bpp;
> > > -					pipe_config->port_clock = link_clock;
> > > -
> > > +				pipe_config->lane_count = lane_count;
> > > +				pipe_config->pipe_bpp = bpp;
> > > +				pipe_config->port_clock = link_clock;
> > > +				if (mode_rate <= link_avail)
> > >  					return true;
> > 
> > Why do we need to assign these if we don't accept the configuration?
> 
> We need to assign them because in case of failure, we use them to then configure DSC parameters
> in intel_dp_dsc_compute_config().

What you are doing is now is effectively:
pipe_config->lane_count = max_lanes;
pipe_config->pipe_bpp = min_bpp;
pipe_config->port_clock = max_clock;

So might as well do that explicitly in dsc_compute_config() then.
Not sure that makes sense though. Maybe we DSC we can make due
with a slower/narrower link? So we might want to iterate the
possible configurations again with dsc.

> Previously we were just returning a failure if this failed and so we need not ssign them. But now
> in case this fails, we try the DSC compute config.
> 
> > 
> > > -				}
> > >  			}
> > >  		}
> > >  	}
> > > @@ -2020,14 +2029,11 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> > >  				link_clock = intel_dp->common_rates[clock];
> > >  				link_avail = intel_dp_max_data_rate(link_clock,
> > >  								    lane_count);
> > > -
> > > -				if (mode_rate <= link_avail) {
> > > -					pipe_config->lane_count = lane_count;
> > > -					pipe_config->pipe_bpp = bpp;
> > > -					pipe_config->port_clock = link_clock;
> > > -
> > > +				pipe_config->lane_count = lane_count;
> > > +				pipe_config->pipe_bpp = bpp;
> > > +				pipe_config->port_clock = link_clock;
> > > +				if (mode_rate <= link_avail)
> > >  					return true;
> > > -				}
> > >  			}
> > >  		}
> > >  	}
> > > @@ -2035,14 +2041,88 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
> > >  	return false;
> > >  }
> > >  
> > > +static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> > > +					struct intel_crtc_state *pipe_config,
> > > +					struct link_config_limits *limits)
> > > +{
> > > +	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > > +	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> > > +	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> > > +	enum pipe pipe = to_intel_crtc(pipe_config->base.crtc)->pipe;
> > > +	u16 dsc_max_output_bpp = 0;
> > > +	u8 dsc_dp_slice_count = 0;
> > > +
> > > +	if (INTEL_GEN(dev_priv) < 10 ||
> > > +	    !drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd))
> > > +		return false;
> > > +
> > > +	/* DP DSC only supported on Pipe B and C */
> > > +	if (pipe == PIPE_A && !intel_dp_is_edp(intel_dp))
> > > +		return false;
> > 
> > Do we mean 'transcoder == EDP || transcoder == B || transcoder == C' ?
> > Or maybe 'transcoder != A' for short. I guess this will need to adjusted
> > for the next platform anyway so making the assumption that transcoder A
> > is the only one that can't do DSC is fine.
> 
> Yes the mode I am trying to reject is in case of a NUC, where there is no edp, the first
> DP connection will use Pipe A and transcoder A which does not support DSC. So reject it.
> So yea I guess I could just check for transcoder == A , then reject.
> 
> > 
> > This whole thing seems like a good helper function.
> > intel_dp_source_supports_dsc() or something like that. And then we
> > could have intel_dp_supports_dsc() which just calls that +
> > drm_dp_sink_supports_dsc().
> > 
> > intel_dp_compute_bpp() should use this at least, and probably a few
> > other places as well.
> > 
> > > +
> > > +	/* DSC not supported for DSC sink BPC < 8 */
> > > +	if (limits->max_bpp < 3 * DP_DSC_MIN_SUPPORTED_BPC) {
> > > +		DRM_DEBUG_KMS("No DSC support for less than 8bpc\n");
> > > +		return false;
> > > +	}
> > > +
> > > +	if (intel_dp_is_edp(intel_dp)) {
> > > +		pipe_config->dsc_params.compressed_bpp =
> > > +			drm_edp_dsc_sink_output_bpp(intel_dp->dsc_dpcd) >> 4;
> > > +		pipe_config->dsc_params.slice_count =
> > > +			drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
> > > +							true);
> > > +	} else {
> > > +		dsc_max_output_bpp =
> > > +			intel_dp_dsc_get_output_bpp(pipe_config->port_clock,
> > > +						    pipe_config->lane_count,
> > > +						    adjusted_mode->crtc_clock,
> > > +						    adjusted_mode->crtc_hdisplay);
> > > +		dsc_dp_slice_count =
> > > +			intel_dp_dsc_get_slice_count(intel_dp,
> > > +						     adjusted_mode->crtc_clock,
> > > +						     adjusted_mode->crtc_hdisplay);
> > > +		if (!(dsc_max_output_bpp && dsc_dp_slice_count)) {
> > > +			DRM_DEBUG_KMS("Compressed BPP/Slice Count not supported\n");
> > > +			return false;
> > > +		}
> > > +		pipe_config->dsc_params.compressed_bpp = dsc_max_output_bpp >> 4;
> > > +		pipe_config->dsc_params.slice_count = dsc_dp_slice_count;
> > > +	}
> > > +	/*
> > > +	 * VDSC engine operates at 1 Pixel per clock, so if peak pixel rate
> > > +	 * is greater than the maximum Cdclock and if slice count is even
> > > +	 * then we need to use 2 VDSC instances.
> > > +	 */
> > > +	pipe_config->dsc_params.dsc_split = false;
> > > +	if (adjusted_mode->crtc_clock > dev_priv->max_cdclk_freq) {
> > > +		if (pipe_config->dsc_params.slice_count > 1) {
> > > +			pipe_config->dsc_params.dsc_split = true;
> > > +		} else {
> > > +			DRM_DEBUG_KMS("Cannot split stream to use 2 VDSC instances\n");
> > > +			return false;
> > > +		}
> > > +	}
> > > +	pipe_config->dsc_params.compression_enable = true;
> > > +	DRM_DEBUG_KMS("DP DSC computed with Input Bpp = %d "
> > > +		      "Compressed Bpp = %d Slice Count = %d\n",
> > > +		      pipe_config->pipe_bpp,
> > > +		      pipe_config->dsc_params.compressed_bpp,
> > > +		      pipe_config->dsc_params.slice_count);
> > > +
> > > +	return true;
> > > +}
> > > +
> > >  static bool
> > >  intel_dp_compute_link_config(struct intel_encoder *encoder,
> > >  			     struct intel_crtc_state *pipe_config)
> > >  {
> > > +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> > >  	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> > >  	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> > >  	struct link_config_limits limits;
> > >  	int common_len;
> > > +	bool ret = false;
> > >  
> > >  	common_len = intel_dp_common_len_rate_limit(intel_dp,
> > >  						    intel_dp->max_link_rate);
> > > @@ -2056,7 +2136,9 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
> > >  	limits.min_lane_count = 1;
> > >  	limits.max_lane_count = intel_dp_max_lane_count(intel_dp);
> > >  
> > > -	limits.min_bpp = 6 * 3;
> > > +	limits.min_bpp = (INTEL_GEN(dev_priv) >= 10 &&
> > > +			  drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) ?
> > > +		DP_DSC_MIN_SUPPORTED_BPC * 3 : 6 * 3;
> > >  	limits.max_bpp = intel_dp_compute_bpp(intel_dp, pipe_config);
> > 
> > Hmm. This now assumes that we will in fact use DSC. I guess we can only
> > make that assumption when we've determined that DSC is supported and the
> > max_bpp also allows DSC.
> 
> But the intel_dp_compute_bpp does check for supports_dsc so that
> should be fine. But for min_bpp yes I could use the below logic.

min_bpp is what I'm talking about here. We can't set it assuming DSC
will be used if the max_bpp is already below the DSC minimum.

> And may be move that to a helper?

Is there some other use for it? I'd rather keep this "populate the
limits" thing in one spot.

> 
> Manasi
> 
> 
> > 
> > So something like:
> > 
> > max_bpp = intel_dp_compute_bpp();
> > if (supports_dsc() && max_bpp >= DP_DSC_MIN_SUPPORTED_BPC*3)
> > 	min_bpp = DP_DSC_MIN_SUPPORTED_BPC * 3;
> > else
> > 	min_bpp = 6 * 3
> > 
> > >  
> > >  	if (intel_dp_is_edp(intel_dp) && intel_dp->edp_dpcd[0] < DP_EDP_14) {
> > > @@ -2081,7 +2163,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
> > >  		      intel_dp->common_rates[limits.max_clock],
> > >  		      limits.max_bpp, adjusted_mode->crtc_clock);
> > >  
> > > -	if (intel_dp_is_edp(intel_dp)) {
> > > +	if (intel_dp_is_edp(intel_dp))
> > >  		/*
> > >  		 * Optimize for fast and narrow. eDP 1.3 section 3.3 and eDP 1.4
> > >  		 * section A.1: "It is recommended that the minimum number of
> > > @@ -2091,26 +2173,48 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
> > >  		 * Note that we use the max clock and lane count for eDP 1.3 and
> > >  		 * earlier, and fast vs. wide is irrelevant.
> > >  		 */
> > > -		if (!intel_dp_compute_link_config_fast(intel_dp, pipe_config,
> > > -						       &limits))
> > > -			return false;
> > > -	} else {
> > > +		ret = intel_dp_compute_link_config_fast(intel_dp, pipe_config,
> > > +							&limits);
> > > +	else
> > >  		/* Optimize for slow and wide. */
> > > -		if (!intel_dp_compute_link_config_wide(intel_dp, pipe_config,
> > > -						       &limits))
> > > +		ret = intel_dp_compute_link_config_wide(intel_dp, pipe_config,
> > > +							&limits);
> > > +
> > > +	/* enable compression if the mode doesn't fit available BW */
> > > +	if (!ret) {
> > > +		DRM_DEBUG_KMS("DP required Link rate %i does not fit available %i\n",
> > > +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> > > +						     pipe_config->pipe_bpp),
> > > +			      intel_dp_max_data_rate(pipe_config->port_clock,
> > > +						     pipe_config->lane_count));
> > > +
> > > +		if (!intel_dp_dsc_compute_config(intel_dp, pipe_config,
> > > +						 &limits))
> > >  			return false;
> > >  	}
> > >  
> > > -	DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
> > > -		      pipe_config->lane_count, pipe_config->port_clock,
> > > -		      pipe_config->pipe_bpp);
> > > +	if (pipe_config->dsc_params.compression_enable) {
> > > +		DRM_DEBUG_KMS("DP lane count %d clock %d Input bpp %d Compressed bpp %d\n",
> > > +			      pipe_config->lane_count, pipe_config->port_clock,
> > > +			      pipe_config->pipe_bpp,
> > > +			      pipe_config->dsc_params.compressed_bpp);
> > >  
> > > -	DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> > > -		      intel_dp_link_required(adjusted_mode->crtc_clock,
> > > -					     pipe_config->pipe_bpp),
> > > -		      intel_dp_max_data_rate(pipe_config->port_clock,
> > > -					     pipe_config->lane_count));
> > > +		DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> > > +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> > > +						     pipe_config->dsc_params.compressed_bpp),
> > > +			      intel_dp_max_data_rate(pipe_config->port_clock,
> > > +						     pipe_config->lane_count));
> > > +	} else {
> > > +		DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
> > > +			      pipe_config->lane_count, pipe_config->port_clock,
> > > +			      pipe_config->pipe_bpp);
> > >  
> > > +		DRM_DEBUG_KMS("DP link rate required %i available %i\n",
> > > +			      intel_dp_link_required(adjusted_mode->crtc_clock,
> > > +						     pipe_config->pipe_bpp),
> > > +			      intel_dp_max_data_rate(pipe_config->port_clock,
> > > +						     pipe_config->lane_count));
> > > +	}
> > >  	return true;
> > >  }
> > >  
> > > @@ -2194,7 +2298,9 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> > >  			intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_LIMITED;
> > >  	}
> > >  
> > > -	intel_link_compute_m_n(pipe_config->pipe_bpp, pipe_config->lane_count,
> > > +	intel_link_compute_m_n(pipe_config->pipe_bpp,
> > > +			       pipe_config->dsc_params.compressed_bpp,
> > > +			       pipe_config->lane_count,
> > >  			       adjusted_mode->crtc_clock,
> > >  			       pipe_config->port_clock,
> > >  			       &pipe_config->dp_m_n,
> > > @@ -2203,7 +2309,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> > >  	if (intel_connector->panel.downclock_mode != NULL &&
> > >  		dev_priv->drrs.type == SEAMLESS_DRRS_SUPPORT) {
> > >  			pipe_config->has_drrs = true;
> > > -			intel_link_compute_m_n(pipe_config->pipe_bpp,
> > > +			intel_link_compute_m_n(pipe_config->pipe_bpp, 0,
> > >  					       pipe_config->lane_count,
> > >  					       intel_connector->panel.downclock_mode->clock,
> > >  					       pipe_config->port_clock,
> > > diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> > > index 8b71d64ebd9d..e02caedd443c 100644
> > > --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> > > +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> > > @@ -90,7 +90,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
> > >  		}
> > >  	}
> > >  
> > > -	intel_link_compute_m_n(bpp, lane_count,
> > > +	intel_link_compute_m_n(bpp, 0, lane_count,
> > >  			       adjusted_mode->crtc_clock,
> > >  			       pipe_config->port_clock,
> > >  			       &pipe_config->dp_m_n,
> > > -- 
> > > 2.18.0
> > 
> > -- 
> > Ville Syrjälä
> > Intel

-- 
Ville Syrjälä
Intel
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[PATCH v6 14/28] drm/i915/dp: Do not enable PSR2 if DSC is enabled

[Manasi Navare]

If a eDP panel supports both PSR2 and VDSC, our HW cannot
support both at a time. Give priority to PSR2 if a requested
resolution can be supported without compression else enable
VDSC and keep PSR2 disabled.

v3:
* Rebase
v2:
* Add warning for DSC and PSR2 enabled together (DK)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_psr.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 423cdf84059c..37ad21e859af 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -71,9 +71,9 @@ static bool psr_global_enabled(u32 debug)
 static bool intel_psr2_enabled(struct drm_i915_private *dev_priv,
 			       const struct intel_crtc_state *crtc_state)
 {
-	/* Disable PSR2 by default for all platforms */
-	if (i915_modparams.enable_psr == -1)
-		return false;
+	/* Cannot enable DSC and PSR2 simultaneously */
+	WARN_ON(crtc_state->dsc_params.compression_enable &&
+		crtc_state->has_psr2);
 
 	switch (dev_priv->psr.debug & I915_PSR_DEBUG_MODE_MASK) {
 	case I915_PSR_DEBUG_FORCE_PSR1:
@@ -463,6 +463,16 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 	if (!dev_priv->psr.sink_psr2_support)
 		return false;
 
+	/*
+	 * DSC and PSR2 cannot be enabled simultaneously. If a requested
+	 * resolution requires DSC to be enabled, priority is given to DSC
+	 * over PSR2.
+	 */
+	if (crtc_state->dsc_params.compression_enable) {
+		DRM_DEBUG_KMS("PSR2 cannot be enabled since DSC is enabled\n");
+		return false;
+	}
+
 	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) {
 		psr_max_h = 4096;
 		psr_max_v = 2304;
-- 
2.18.0

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[PATCH v6 15/28] drm/dsc: Define the DSC 1.1 and 1.2 Line Buffer depth constants

[Manasi Navare]

DSC specification defines linebuf_depth which contains the
line buffer bit depth used to generate the bitstream.
These values are defined as per Table 4.1 in DSC 1.2 spec

v2 (From Manasi):
* Rename as MAX_LINEBUF_DEPTH for DSC 1.1 and DSC 1.2

Cc: dri-devel@lists.freedesktop.org
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 include/drm/drm_dsc.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
index 0e5e3368d645..8562d8ee8161 100644
--- a/include/drm/drm_dsc.h
+++ b/include/drm/drm_dsc.h
@@ -41,6 +41,9 @@
 #define DSC_PPS_RC_RANGE_MINQP_SHIFT		11
 #define DSC_PPS_RC_RANGE_MAXQP_SHIFT		6
 #define DSC_PPS_NATIVE_420_SHIFT		1
+#define DSC_1_2_MAX_LINEBUF_DEPTH_BITS		16
+#define DSC_1_2_MAX_LINEBUF_DEPTH_VAL		0
+#define DSC_1_1_MAX_LINEBUF_DEPTH_BITS		13
 
 /* Configuration for a single Rate Control model range */
 struct dsc_rc_range_parameters {
-- 
2.18.0

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[PATCH v6 16/28] drm/i915/dsc: Define & Compute VESA DSC params

[Manasi Navare]

From: Gaurav K Singh <gaurav.k.singh@intel.com>

This patches does the following:

1. This patch defines all the DSC parameters as per the VESA
DSC specification. These are stored in the encoder and used
to compute the PPS parameters to be sent to the Sink.
2. Compute all the DSC parameters which are derived from DSC
state of intel_crtc_state.
3. Compute all parameters that are VESA DSC specific

This computation happens in the atomic check phase during
compute_config() to validate if display stream compression
can be enabled for the requested mode.

v7: (From Manasi)
* Dont use signed int for rc_range_params (Manasi)
* Mask the range_bpg_offset to use only 6 bits
* Add SPDX identifier (Chris Wilson)
v6 (From Manasi):
* Add a check for line_buf_depth return value (Anusha)
* Remove DRM DSC constants to different patch (Manasi)
v5 (From Manasi):
* Add logic to limit the max line buf depth for DSC 1.1 to 13
as per DSC 1.1 spec
* Fix dim checkpatch warnings/checks

v4 (From Gaurav):
* Rebase on latest drm tip
* rename variable name(Manasi)
* Populate linebuf_depth variable(Manasi)

v3 (From Gaurav):
* Rebase my previous patches on top of Manasi's latest patch
series
* Using >>n rather than /2^n (Manasi)
* Change the commit message to explain what the patch is doing(Gaurav)

Fixed review comments from Ville:
* Don't use macro TWOS_COMPLEMENT
* Mention in comment about the source of RC params
* Return directly from case statements
* Using single asssignment for assigning rc_range_params
* Using <<n rather than *2^n and removing the comments
about the fixed point numbers

v2 (From Manasi):
* Update logic for minor version to consider the dpcd value
and what supported by the HW platform
* Use DRM DSC config struct instead of intel_dp struct
* Move the DSC constants to DRM DSC header file
* Use u16, u8 where bigger data types not needed
* * Compute the DSC parameters as part of DSC compute config
since the computation can fail (Manasi)

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Co-developed-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/Makefile     |   3 +-
 drivers/gpu/drm/i915/intel_dp.c   |   7 +
 drivers/gpu/drm/i915/intel_drv.h  |   4 +
 drivers/gpu/drm/i915/intel_vdsc.c | 455 ++++++++++++++++++++++++++++++
 include/drm/drm_dp_helper.h       |   3 +
 5 files changed, 471 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/i915/intel_vdsc.c

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 28c7d7884e88..a51a9ae0f496 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -156,7 +156,8 @@ i915-y += dvo_ch7017.o \
 	  intel_sdvo.o \
 	  intel_tv.o \
 	  vlv_dsi.o \
-	  vlv_dsi_pll.o
+	  vlv_dsi_pll.o \
+	  intel_vdsc.o
 
 # Post-mortem debug and GPU hang state capture
 i915-$(CONFIG_DRM_I915_CAPTURE_ERROR) += i915_gpu_error.o
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index a88f9371dd32..35162c3bc811 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2103,6 +2103,13 @@ static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 			return false;
 		}
 	}
+	if (intel_dp_compute_dsc_params(intel_dp, pipe_config) < 0) {
+		DRM_ERROR("Cannot compute valid DSC parameters for Input Bpp = %d"
+			  "Compressed BPP = %d\n",
+			  pipe_config->pipe_bpp,
+			  pipe_config->dsc_params.compressed_bpp);
+		return false;
+	}
 	pipe_config->dsc_params.compression_enable = true;
 	DRM_DEBUG_KMS("DP DSC computed with Input Bpp = %d "
 		      "Compressed Bpp = %d Slice Count = %d\n",
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 27d47950f438..c4be4ba7adac 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1844,6 +1844,10 @@ uint16_t intel_dp_dsc_get_output_bpp(int link_clock, uint8_t lane_count,
 uint8_t intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp, int mode_clock,
 				     int mode_hdisplay);
 
+/* intel_vdsc.c */
+int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
+				struct intel_crtc_state *pipe_config);
+
 static inline unsigned int intel_dp_unused_lane_mask(int lane_count)
 {
 	return ~((1 << lane_count) - 1) & 0xf;
diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
new file mode 100644
index 000000000000..351ea7d71c21
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_vdsc.c
@@ -0,0 +1,455 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2018 Intel Corporation
+ *
+ * Author: Gaurav K Singh <gaurav.k.singh@intel.com>
+ *         Manasi Navare <manasi.d.navare@intel.com>
+ */
+
+#include <drm/drmP.h>
+#include <drm/i915_drm.h>
+#include "i915_drv.h"
+#include "intel_drv.h"
+
+enum ROW_INDEX_BPP {
+	ROW_INDEX_6BPP = 0,
+	ROW_INDEX_8BPP,
+	ROW_INDEX_10BPP,
+	ROW_INDEX_12BPP,
+	ROW_INDEX_15BPP,
+	MAX_ROW_INDEX
+};
+
+enum COLUMN_INDEX_BPC {
+	COLUMN_INDEX_8BPC = 0,
+	COLUMN_INDEX_10BPC,
+	COLUMN_INDEX_12BPC,
+	COLUMN_INDEX_14BPC,
+	COLUMN_INDEX_16BPC,
+	MAX_COLUMN_INDEX
+};
+
+#define DSC_SUPPORTED_VERSION_MIN		1
+
+/* From DSC_v1.11 spec, rc_parameter_Set syntax element typically constant */
+static u16 rc_buf_thresh[] = {
+	896, 1792, 2688, 3584, 4480, 5376, 6272, 6720, 7168, 7616,
+	7744, 7872, 8000, 8064
+};
+
+struct rc_parameters {
+	u16 initial_xmit_delay;
+	u8 first_line_bpg_offset;
+	u16 initial_offset;
+	u8 flatness_min_qp;
+	u8 flatness_max_qp;
+	u8 rc_quant_incr_limit0;
+	u8 rc_quant_incr_limit1;
+	struct dsc_rc_range_parameters rc_range_params[DSC_NUM_BUF_RANGES];
+};
+
+/*
+ * Selected Rate Control Related Parameter Recommended Values
+ * from DSC_v1.11 spec & C Model release: DSC_model_20161212
+ */
+static struct rc_parameters rc_params[][MAX_COLUMN_INDEX] = {
+{
+	/* 6BPP/8BPC */
+	{ 768, 15, 6144, 3, 13, 11, 11, {
+		{ 0, 4, 0 }, { 1, 6, -2 }, { 3, 8, -2 }, { 4, 8, -4 },
+		{ 5, 9, -6 }, { 5, 9, -6 }, { 6, 9, -6 }, { 6, 10, -8 },
+		{ 7, 11, -8 }, { 8, 12, -10 }, { 9, 12, -10 }, { 10, 12, -12 },
+		{ 10, 12, -12 }, { 11, 12, -12 }, { 13, 14, -12 }
+		}
+	},
+	/* 6BPP/10BPC */
+	{ 768, 15, 6144, 7, 17, 15, 15, {
+		{ 0, 8, 0 }, { 3, 10, -2 }, { 7, 12, -2 }, { 8, 12, -4 },
+		{ 9, 13, -6 }, { 9, 13, -6 }, { 10, 13, -6 }, { 10, 14, -8 },
+		{ 11, 15, -8 }, { 12, 16, -10 }, { 13, 16, -10 },
+		{ 14, 16, -12 }, { 14, 16, -12 }, { 15, 16, -12 },
+		{ 17, 18, -12 }
+		}
+	},
+	/* 6BPP/12BPC */
+	{ 768, 15, 6144, 11, 21, 19, 19, {
+		{ 0, 12, 0 }, { 5, 14, -2 }, { 11, 16, -2 }, { 12, 16, -4 },
+		{ 13, 17, -6 }, { 13, 17, -6 }, { 14, 17, -6 }, { 14, 18, -8 },
+		{ 15, 19, -8 }, { 16, 20, -10 }, { 17, 20, -10 },
+		{ 18, 20, -12 }, { 18, 20, -12 }, { 19, 20, -12 },
+		{ 21, 22, -12 }
+		}
+	},
+	/* 6BPP/14BPC */
+	{ 768, 15, 6144, 15, 25, 23, 27, {
+		{ 0, 16, 0 }, { 7, 18, -2 }, { 15, 20, -2 }, { 16, 20, -4 },
+		{ 17, 21, -6 }, { 17, 21, -6 }, { 18, 21, -6 }, { 18, 22, -8 },
+		{ 19, 23, -8 }, { 20, 24, -10 }, { 21, 24, -10 },
+		{ 22, 24, -12 }, { 22, 24, -12 }, { 23, 24, -12 },
+		{ 25, 26, -12 }
+		}
+	},
+	/* 6BPP/16BPC */
+	{ 768, 15, 6144, 19, 29, 27, 27, {
+		{ 0, 20, 0 }, { 9, 22, -2 }, { 19, 24, -2 }, { 20, 24, -4 },
+		{ 21, 25, -6 }, { 21, 25, -6 }, { 22, 25, -6 }, { 22, 26, -8 },
+		{ 23, 27, -8 }, { 24, 28, -10 }, { 25, 28, -10 },
+		{ 26, 28, -12 }, { 26, 28, -12 }, { 27, 28, -12 },
+		{ 29, 30, -12 }
+		}
+	},
+},
+{
+	/* 8BPP/8BPC */
+	{ 512, 12, 6144, 3, 12, 11, 11, {
+		{ 0, 4, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
+		{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
+		{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 }, { 5, 12, -12 },
+		{ 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
+		}
+	},
+	/* 8BPP/10BPC */
+	{ 512, 12, 6144, 7, 16, 15, 15, {
+		{ 0, 4, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
+		{ 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
+		{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
+		{ 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
+		}
+	},
+	/* 8BPP/12BPC */
+	{ 512, 12, 6144, 11, 20, 19, 19, {
+		{ 0, 12, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 9, 14, -2 },
+		{ 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
+		{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
+		{ 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
+		{ 21, 23, -12 }
+		}
+	},
+	/* 8BPP/14BPC */
+	{ 512, 12, 6144, 15, 24, 23, 23, {
+		{ 0, 12, 0 }, { 5, 13, 0 }, { 11, 15, 0 }, { 12, 17, -2 },
+		{ 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
+		{ 15, 21, -8 }, { 15, 22, -10 }, { 17, 22, -10 },
+		{ 17, 23, -12 }, { 17, 23, -12 }, { 21, 24, -12 },
+		{ 24, 25, -12 }
+		}
+	},
+	/* 8BPP/16BPC */
+	{ 512, 12, 6144, 19, 28, 27, 27, {
+		{ 0, 12, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 15, 20, -2 },
+		{ 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
+		{ 19, 25, -8 }, { 19, 26, -10 }, { 21, 26, -10 },
+		{ 21, 27, -12 }, { 21, 27, -12 }, { 25, 28, -12 },
+		{ 28, 29, -12 }
+		}
+	},
+},
+{
+	/* 10BPP/8BPC */
+	{ 410, 15, 5632, 3, 12, 11, 11, {
+		{ 0, 3, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 2, 6, -2 },
+		{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
+		{ 3, 9, -8 }, { 3, 9, -10 }, { 5, 10, -10 }, { 5, 10, -10 },
+		{ 5, 11, -12 }, { 7, 11, -12 }, { 11, 12, -12 }
+		}
+	},
+	/* 10BPP/10BPC */
+	{ 410, 15, 5632, 7, 16, 15, 15, {
+		{ 0, 7, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 6, 10, -2 },
+		{ 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
+		{ 7, 13, -8 }, { 7, 13, -10 }, { 9, 14, -10 }, { 9, 14, -10 },
+		{ 9, 15, -12 }, { 11, 15, -12 }, { 15, 16, -12 }
+		}
+	},
+	/* 10BPP/12BPC */
+	{ 410, 15, 5632, 11, 20, 19, 19, {
+		{ 0, 11, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 10, 14, -2 },
+		{ 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
+		{ 11, 17, -8 }, { 11, 17, -10 }, { 13, 18, -10 },
+		{ 13, 18, -10 }, { 13, 19, -12 }, { 15, 19, -12 },
+		{ 19, 20, -12 }
+		}
+	},
+	/* 10BPP/14BPC */
+	{ 410, 15, 5632, 15, 24, 23, 23, {
+		{ 0, 11, 2 }, { 5, 13, 0 }, { 11, 15, 0 }, { 13, 18, -2 },
+		{ 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
+		{ 15, 21, -8 }, { 15, 21, -10 }, { 17, 22, -10 },
+		{ 17, 22, -10 }, { 17, 23, -12 }, { 19, 23, -12 },
+		{ 23, 24, -12 }
+		}
+	},
+	/* 10BPP/16BPC */
+	{ 410, 15, 5632, 19, 28, 27, 27, {
+		{ 0, 11, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 16, 20, -2 },
+		{ 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
+		{ 19, 25, -8 }, { 19, 25, -10 }, { 21, 26, -10 },
+		{ 21, 26, -10 }, { 21, 27, -12 }, { 23, 27, -12 },
+		{ 27, 28, -12 }
+		}
+	},
+},
+{
+	/* 12BPP/8BPC */
+	{ 341, 15, 2048, 3, 12, 11, 11, {
+		{ 0, 2, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
+		{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
+		{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 },
+		{ 5, 12, -12 }, { 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
+		}
+	},
+	/* 12BPP/10BPC */
+	{ 341, 15, 2048, 7, 16, 15, 15, {
+		{ 0, 2, 2 }, { 2, 5, 0 }, { 3, 7, 0 }, { 4, 8, -2 },
+		{ 6, 9, -4 }, { 7, 10, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
+		{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
+		{ 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
+		}
+	},
+	/* 12BPP/12BPC */
+	{ 341, 15, 2048, 11, 20, 19, 19, {
+		{ 0, 6, 2 }, { 4, 9, 0 }, { 7, 11, 0 }, { 8, 12, -2 },
+		{ 10, 13, -4 }, { 11, 14, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
+		{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
+		{ 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
+		{ 21, 23, -12 }
+		}
+	},
+	/* 12BPP/14BPC */
+	{ 341, 15, 2048, 15, 24, 23, 23, {
+		{ 0, 6, 2 }, { 7, 10, 0 }, { 9, 13, 0 }, { 11, 16, -2 },
+		{ 14, 17, -4 }, { 15, 18, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
+		{ 15, 20, -8 }, { 15, 21, -10 }, { 17, 21, -10 },
+		{ 17, 21, -12 }, { 17, 21, -12 }, { 19, 22, -12 },
+		{ 22, 23, -12 }
+		}
+	},
+	/* 12BPP/16BPC */
+	{ 341, 15, 2048, 19, 28, 27, 27, {
+		{ 0, 6, 2 }, { 6, 11, 0 }, { 11, 15, 0 }, { 14, 18, -2 },
+		{ 18, 21, -4 }, { 19, 22, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
+		{ 19, 24, -8 }, { 19, 25, -10 }, { 21, 25, -10 },
+		{ 21, 25, -12 }, { 21, 25, -12 }, { 23, 26, -12 },
+		{ 26, 27, -12 }
+		}
+	},
+},
+{
+	/* 15BPP/8BPC */
+	{ 273, 15, 2048, 3, 12, 11, 11, {
+		{ 0, 0, 10 }, { 0, 1, 8 }, { 0, 1, 6 }, { 0, 2, 4 },
+		{ 1, 2, 2 }, { 1, 3, 0 }, { 1, 3, -2 }, { 2, 4, -4 },
+		{ 2, 5, -6 }, { 3, 5, -8 }, { 4, 6, -10 }, { 4, 7, -10 },
+		{ 5, 7, -12 }, { 7, 8, -12 }, { 8, 9, -12 }
+		}
+	},
+	/* 15BPP/10BPC */
+	{ 273, 15, 2048, 7, 16, 15, 15, {
+		{ 0, 2, 10 }, { 2, 5, 8 }, { 3, 5, 6 }, { 4, 6, 4 },
+		{ 5, 6, 2 }, { 5, 7, 0 }, { 5, 7, -2 }, { 6, 8, -4 },
+		{ 6, 9, -6 }, { 7, 9, -8 }, { 8, 10, -10 }, { 8, 11, -10 },
+		{ 9, 11, -12 }, { 11, 12, -12 }, { 12, 13, -12 }
+		}
+	},
+	/* 15BPP/12BPC */
+	{ 273, 15, 2048, 11, 20, 19, 19, {
+		{ 0, 4, 10 }, { 2, 7, 8 }, { 4, 9, 6 }, { 6, 11, 4 },
+		{ 9, 11, 2 }, { 9, 11, 0 }, { 9, 12, -2 }, { 10, 12, -4 },
+		{ 11, 13, -6 }, { 11, 13, -8 }, { 12, 14, -10 },
+		{ 13, 15, -10 }, { 13, 15, -12 }, { 15, 16, -12 },
+		{ 16, 17, -12 }
+		}
+	},
+	/* 15BPP/14BPC */
+	{ 273, 15, 2048, 15, 24, 23, 23, {
+		{ 0, 4, 10 }, { 3, 8, 8 }, { 6, 11, 6 }, { 9, 14, 4 },
+		{ 13, 15, 2 }, { 13, 15, 0 }, { 13, 16, -2 }, { 14, 16, -4 },
+		{ 15, 17, -6 }, { 15, 17, -8 }, { 16, 18, -10 },
+		{ 17, 19, -10 }, { 17, 19, -12 }, { 19, 20, -12 },
+		{ 20, 21, -12 }
+		}
+	},
+	/* 15BPP/16BPC */
+	{ 273, 15, 2048, 19, 28, 27, 27, {
+		{ 0, 4, 10 }, { 4, 9, 8 }, { 8, 13, 6 }, { 12, 17, 4 },
+		{ 17, 19, 2 }, { 17, 20, 0 }, { 17, 20, -2 }, { 18, 20, -4 },
+		{ 19, 21, -6 }, { 19, 21, -8 }, { 20, 22, -10 },
+		{ 21, 23, -10 }, { 21, 23, -12 }, { 23, 24, -12 },
+		{ 24, 25, -12 }
+		}
+	}
+}
+};
+
+static int get_row_index_for_rc_params(u16 compressed_bpp)
+{
+	switch (compressed_bpp) {
+	case 6:
+		return ROW_INDEX_6BPP;
+	case 8:
+		return ROW_INDEX_8BPP;
+	case 10:
+		return ROW_INDEX_10BPP;
+	case 12:
+		return ROW_INDEX_12BPP;
+	case 15:
+		return ROW_INDEX_15BPP;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int get_column_index_for_rc_params(u8 bits_per_component)
+{
+	switch (bits_per_component) {
+	case 8:
+		return COLUMN_INDEX_8BPC;
+	case 10:
+		return COLUMN_INDEX_10BPC;
+	case 12:
+		return COLUMN_INDEX_12BPC;
+	case 14:
+		return COLUMN_INDEX_14BPC;
+	case 16:
+		return COLUMN_INDEX_16BPC;
+	default:
+		return -EINVAL;
+	}
+}
+
+int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
+				struct intel_crtc_state *pipe_config)
+{
+	struct drm_dsc_config *vdsc_cfg = &pipe_config->dp_dsc_cfg;
+	u16 compressed_bpp = pipe_config->dsc_params.compressed_bpp;
+	u8 i = 0;
+	u8 row_index = 0;
+	u8 column_index = 0;
+	u8 line_buf_depth = 0;
+
+	vdsc_cfg->pic_width = pipe_config->base.adjusted_mode.crtc_hdisplay;
+	vdsc_cfg->pic_height = pipe_config->base.adjusted_mode.crtc_vdisplay;
+	vdsc_cfg->slice_width = DIV_ROUND_UP(vdsc_cfg->pic_width,
+					     pipe_config->dsc_params.slice_count);
+	/*
+	 * Slice Height of 8 works for all currently available panels. So start
+	 * with that if pic_height is an integral multiple of 8.
+	 * Eventually add logic to try multiple slice heights.
+	 */
+	if (vdsc_cfg->pic_height % 8 == 0)
+		vdsc_cfg->slice_height = 8;
+	else if (vdsc_cfg->pic_height % 4 == 0)
+		vdsc_cfg->slice_height = 4;
+	else
+		vdsc_cfg->slice_height = 2;
+
+	/* Values filled from DSC Sink DPCD */
+	vdsc_cfg->dsc_version_major =
+		(intel_dp->dsc_dpcd[DP_DSC_REV - DP_DSC_SUPPORT] &
+		 DP_DSC_MAJOR_MASK) >> DP_DSC_MAJOR_SHIFT;
+	vdsc_cfg->dsc_version_minor =
+		min(DSC_SUPPORTED_VERSION_MIN,
+		    (intel_dp->dsc_dpcd[DP_DSC_REV - DP_DSC_SUPPORT] &
+		     DP_DSC_MINOR_MASK) >> DP_DSC_MINOR_SHIFT);
+
+	vdsc_cfg->convert_rgb = intel_dp->dsc_dpcd[DP_DSC_DEC_COLOR_FORMAT_CAP - DP_DSC_SUPPORT] &
+		DP_DSC_RGB;
+
+	line_buf_depth = drm_dp_dsc_sink_line_buf_depth(intel_dp->dsc_dpcd);
+	if (!line_buf_depth) {
+		DRM_DEBUG_KMS("DSC Sink Line Buffer Depth invalid\n");
+		return -EINVAL;
+	}
+	if (vdsc_cfg->dsc_version_minor == 2)
+		vdsc_cfg->line_buf_depth = (line_buf_depth == DSC_1_2_MAX_LINEBUF_DEPTH_BITS) ?
+			DSC_1_2_MAX_LINEBUF_DEPTH_VAL : line_buf_depth;
+	else
+		vdsc_cfg->line_buf_depth = (line_buf_depth > DSC_1_1_MAX_LINEBUF_DEPTH_BITS) ?
+			DSC_1_1_MAX_LINEBUF_DEPTH_BITS : line_buf_depth;
+
+	/* Gen 11 does not support YCbCr */
+	vdsc_cfg->enable422 = false;
+	/* Gen 11 does not support VBR */
+	vdsc_cfg->vbr_enable = false;
+	vdsc_cfg->block_pred_enable =
+			intel_dp->dsc_dpcd[DP_DSC_BLK_PREDICTION_SUPPORT - DP_DSC_SUPPORT] &
+		DP_DSC_BLK_PREDICTION_IS_SUPPORTED;
+
+	/* Gen 11 only supports integral values of bpp */
+	vdsc_cfg->bits_per_pixel = compressed_bpp << 4;
+	vdsc_cfg->bits_per_component = pipe_config->pipe_bpp / 3;
+
+	for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++) {
+		/*
+		 * six 0s are appended to the lsb of each threshold value
+		 * internally in h/w.
+		 * Only 8 bits are allowed for programming RcBufThreshold
+		 */
+		vdsc_cfg->rc_buf_thresh[i] = rc_buf_thresh[i] >> 6;
+	}
+
+	/*
+	 * For 6bpp, RC Buffer threshold 12 and 13 need a different value
+	 * as per C Model
+	 */
+	if (compressed_bpp == 6) {
+		vdsc_cfg->rc_buf_thresh[12] = 0x7C;
+		vdsc_cfg->rc_buf_thresh[13] = 0x7D;
+	}
+
+	row_index = get_row_index_for_rc_params(compressed_bpp);
+	column_index =
+		get_column_index_for_rc_params(vdsc_cfg->bits_per_component);
+
+	if (row_index < 0 || column_index < 0)
+		return -EINVAL;
+
+	vdsc_cfg->first_line_bpg_offset =
+		rc_params[row_index][column_index].first_line_bpg_offset;
+	vdsc_cfg->initial_xmit_delay =
+		rc_params[row_index][column_index].initial_xmit_delay;
+	vdsc_cfg->initial_offset =
+		rc_params[row_index][column_index].initial_offset;
+	vdsc_cfg->flatness_min_qp =
+		rc_params[row_index][column_index].flatness_min_qp;
+	vdsc_cfg->flatness_max_qp =
+		rc_params[row_index][column_index].flatness_max_qp;
+	vdsc_cfg->rc_quant_incr_limit0 =
+		rc_params[row_index][column_index].rc_quant_incr_limit0;
+	vdsc_cfg->rc_quant_incr_limit1 =
+		rc_params[row_index][column_index].rc_quant_incr_limit1;
+
+	for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
+		vdsc_cfg->rc_range_params[i].range_min_qp =
+			rc_params[row_index][column_index].rc_range_params[i].range_min_qp;
+		vdsc_cfg->rc_range_params[i].range_max_qp =
+			rc_params[row_index][column_index].rc_range_params[i].range_max_qp;
+		/*
+		 * Range BPG Offset uses 2's complement and is only a 6 bits. So
+		 * mask it to get only 6 bits.
+		 */
+		vdsc_cfg->rc_range_params[i].range_bpg_offset =
+			rc_params[row_index][column_index].rc_range_params[i].range_bpg_offset &
+			DSC_RANGE_BPG_OFFSET_MASK;
+	}
+
+	/*
+	 * BitsPerComponent value determines mux_word_size:
+	 * When BitsPerComponent is 12bpc, muxWordSize will be equal to 64 bits
+	 * When BitsPerComponent is 8 or 10bpc, muxWordSize will be equal to
+	 * 48 bits
+	 */
+	if (vdsc_cfg->bits_per_component == 8 ||
+	    vdsc_cfg->bits_per_component == 10)
+		vdsc_cfg->mux_word_size = DSC_MUX_WORD_SIZE_8_10_BPC;
+	else if (vdsc_cfg->bits_per_component == 12)
+		vdsc_cfg->mux_word_size = DSC_MUX_WORD_SIZE_12_BPC;
+
+	/* RC_MODEL_SIZE is a constant across all configurations */
+	vdsc_cfg->rc_model_size = DSC_RC_MODEL_SIZE_CONST;
+	/* InitialScaleValue is a 6 bit value with 3 fractional bits (U3.3) */
+	vdsc_cfg->initial_scale_value = (vdsc_cfg->rc_model_size << 3) /
+		(vdsc_cfg->rc_model_size - vdsc_cfg->initial_offset);
+
+	return 0;
+}
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 730243dd41e2..2649529d0d8f 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -187,6 +187,9 @@
 
 #define DP_GUID				    0x030   /* 1.2 */
 
+#define DP_DSC_RC_PIXELS_PER_GROUP		3
+#define DP_DSC_SCALE_DECREMENT_INTERVAL_MAX	4095
+
 #define DP_DSC_SUPPORT                      0x060   /* DP 1.4 */
 # define DP_DSC_DECOMPRESSION_IS_SUPPORTED  (1 << 0)
 
-- 
2.18.0

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[PATCH v6 17/28] drm/i915/dsc: Compute Rate Control parameters for DSC

[Manasi Navare]

From: Gaurav K Singh <gaurav.k.singh@intel.com>

This computation of RC params happens in the atomic commit phase
during compute_config() to validate if display stream compression
can be enabled for the requested mode.

v6 (From Manasi):
* Use 9 instead of 0x9 for consistency (Anusha)

v5 (From Manasi):
* Fix dim checkpatch warnings/checks
v4(From Gaurav):
* No change.Rebase on drm-tip

v3 (From Gaurav):
* Rebase on top of Manasi's latest series
* Return -ve value in case of failure scenarios (Manasi)

Fix review comments from Ville:
* Remove unnecessary comments
* Remove unnecessary paranthesis
* Add comments for few RC params calculations

v2 (From Manasi):
* Rebase Gaurav's patch from intel-gfx to gfx-internal
* Use struct drm_dsc_cfg instead of struct intel_dp
as a parameter

Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/intel_vdsc.c | 127 ++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
index 351ea7d71c21..e6168a1899e1 100644
--- a/drivers/gpu/drm/i915/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/intel_vdsc.c
@@ -317,6 +317,130 @@ static int get_column_index_for_rc_params(u8 bits_per_component)
 	}
 }
 
+static int intel_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg)
+{
+	unsigned long groups_per_line = 0;
+	unsigned long groups_total = 0;
+	unsigned long num_extra_mux_bits = 0;
+	unsigned long slice_bits = 0;
+	unsigned long hrd_delay = 0;
+	unsigned long final_scale = 0;
+	unsigned long rbs_min = 0;
+
+	/* Number of groups used to code each line of a slice */
+	groups_per_line = DIV_ROUND_UP(vdsc_cfg->slice_width,
+				       DSC_RC_PIXELS_PER_GROUP);
+
+	/* chunksize in Bytes */
+	vdsc_cfg->slice_chunk_size = DIV_ROUND_UP(vdsc_cfg->slice_width *
+						  vdsc_cfg->bits_per_pixel,
+						  (8 * 16));
+
+	if (vdsc_cfg->convert_rgb)
+		num_extra_mux_bits = 3 * (vdsc_cfg->mux_word_size +
+					  (4 * vdsc_cfg->bits_per_component + 4)
+					  - 2);
+	else
+		num_extra_mux_bits = 3 * vdsc_cfg->mux_word_size +
+			(4 * vdsc_cfg->bits_per_component + 4) +
+			2 * (4 * vdsc_cfg->bits_per_component) - 2;
+	/* Number of bits in one Slice */
+	slice_bits = 8 * vdsc_cfg->slice_chunk_size * vdsc_cfg->slice_height;
+
+	while ((num_extra_mux_bits > 0) &&
+	       ((slice_bits - num_extra_mux_bits) % vdsc_cfg->mux_word_size))
+		num_extra_mux_bits--;
+
+	if (groups_per_line < vdsc_cfg->initial_scale_value - 8)
+		vdsc_cfg->initial_scale_value = groups_per_line + 8;
+
+	/* scale_decrement_interval calculation according to DSC spec 1.11 */
+	if (vdsc_cfg->initial_scale_value > 8)
+		vdsc_cfg->scale_decrement_interval = groups_per_line /
+			(vdsc_cfg->initial_scale_value - 8);
+	else
+		vdsc_cfg->scale_decrement_interval = DSC_SCALE_DECREMENT_INTERVAL_MAX;
+
+	vdsc_cfg->final_offset = vdsc_cfg->rc_model_size -
+		(vdsc_cfg->initial_xmit_delay *
+		 vdsc_cfg->bits_per_pixel + 8) / 16 + num_extra_mux_bits;
+
+	if (vdsc_cfg->final_offset >= vdsc_cfg->rc_model_size) {
+		DRM_ERROR("FinalOfs < RcModelSze for this InitialXmitDelay\n");
+		return -EINVAL;
+	}
+
+	final_scale = (vdsc_cfg->rc_model_size * 8) /
+		(vdsc_cfg->rc_model_size - vdsc_cfg->final_offset);
+	if (vdsc_cfg->slice_height > 1)
+		/*
+		 * NflBpgOffset is 16 bit value with 11 fractional bits
+		 * hence we multiply by 2^11 for preserving the
+		 * fractional part
+		 */
+		vdsc_cfg->nfl_bpg_offset = DIV_ROUND_UP((vdsc_cfg->first_line_bpg_offset << 11),
+							(vdsc_cfg->slice_height - 1));
+	else
+		vdsc_cfg->nfl_bpg_offset = 0;
+
+	/* 2^16 - 1 */
+	if (vdsc_cfg->nfl_bpg_offset > 65535) {
+		DRM_ERROR("NflBpgOffset is too large for this slice height\n");
+		return -EINVAL;
+	}
+
+	/* Number of groups used to code the entire slice */
+	groups_total = groups_per_line * vdsc_cfg->slice_height;
+
+	/* slice_bpg_offset is 16 bit value with 11 fractional bits */
+	vdsc_cfg->slice_bpg_offset = DIV_ROUND_UP(((vdsc_cfg->rc_model_size -
+						    vdsc_cfg->initial_offset +
+						    num_extra_mux_bits) << 11),
+						  groups_total);
+
+	if (final_scale > 9) {
+		/*
+		 * ScaleIncrementInterval =
+		 * finaloffset/((NflBpgOffset + SliceBpgOffset)*8(finalscale - 1.125))
+		 * as (NflBpgOffset + SliceBpgOffset) has 11 bit fractional value,
+		 * we need divide by 2^11 from pstDscCfg values
+		 */
+		vdsc_cfg->scale_increment_interval =
+				(vdsc_cfg->final_offset * (1 << 11)) /
+				((vdsc_cfg->nfl_bpg_offset +
+				vdsc_cfg->slice_bpg_offset)*
+				(final_scale - 9));
+	} else {
+		/*
+		 * If finalScaleValue is less than or equal to 9, a value of 0 should
+		 * be used to disable the scale increment at the end of the slice
+		 */
+		vdsc_cfg->scale_increment_interval = 0;
+	}
+
+	if (vdsc_cfg->scale_increment_interval > 65535) {
+		DRM_ERROR("ScaleIncrementInterval is large for slice height\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * DSC spec mentions that bits_per_pixel specifies the target
+	 * bits/pixel (bpp) rate that is used by the encoder,
+	 * in steps of 1/16 of a bit per pixel
+	 */
+	rbs_min = vdsc_cfg->rc_model_size - vdsc_cfg->initial_offset +
+		DIV_ROUND_UP(vdsc_cfg->initial_xmit_delay *
+			     vdsc_cfg->bits_per_pixel, 16) +
+		groups_per_line * vdsc_cfg->first_line_bpg_offset;
+
+	hrd_delay = DIV_ROUND_UP((rbs_min * 16), vdsc_cfg->bits_per_pixel);
+	vdsc_cfg->rc_bits = (hrd_delay * vdsc_cfg->bits_per_pixel) / 16;
+	vdsc_cfg->initial_dec_delay = hrd_delay - vdsc_cfg->initial_xmit_delay;
+
+	return 0;
+}
+
+
 int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
 				struct intel_crtc_state *pipe_config)
 {
@@ -451,5 +575,8 @@ int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
 	vdsc_cfg->initial_scale_value = (vdsc_cfg->rc_model_size << 3) /
 		(vdsc_cfg->rc_model_size - vdsc_cfg->initial_offset);
 
+	if (intel_compute_rc_parameters(vdsc_cfg) < 0)
+		return -1;
+
 	return 0;
 }
-- 
2.18.0

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[PATCH v6 18/28] drm/i915/dp: Enable/Disable DSC in DP Sink

[Manasi Navare]

From: Gaurav K Singh <gaurav.k.singh@intel.com>

This patch enables decompression support in sink device
before link training and disables the same during the
DDI disabling.

v2:(From Manasi)
* Change the enable/disable function to take crtc_state
instead of intel_dp as an argument (Manasi)
* Use the compression_enable flag as part of crtc_state (Manasi)

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c |  5 +++++
 drivers/gpu/drm/i915/intel_dp.c  | 15 +++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h |  3 +++
 3 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index e40a8c97d34b..1de0a3917d7f 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2930,6 +2930,8 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
 	intel_ddi_init_dp_buf_reg(encoder);
 	if (!is_mst)
 		intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
+	intel_dp_sink_set_decompression_state(intel_dp, crtc_state,
+					      DP_DECOMPRESSION_EN);
 	intel_dp_start_link_train(intel_dp);
 	if (port != PORT_A || INTEL_GEN(dev_priv) >= 9)
 		intel_dp_stop_link_train(intel_dp);
@@ -3272,6 +3274,9 @@ static void intel_disable_ddi_dp(struct intel_encoder *encoder,
 	intel_edp_drrs_disable(intel_dp, old_crtc_state);
 	intel_psr_disable(intel_dp, old_crtc_state);
 	intel_edp_backlight_off(old_conn_state);
+	/* Disable the decompression in DP Sink */
+	intel_dp_sink_set_decompression_state(intel_dp, old_crtc_state,
+					      ~DP_DECOMPRESSION_EN);
 }
 
 static void intel_disable_ddi_hdmi(struct intel_encoder *encoder,
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 35162c3bc811..72e6605f0ed7 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3005,6 +3005,21 @@ static bool downstream_hpd_needs_d0(struct intel_dp *intel_dp)
 		intel_dp->downstream_ports[0] & DP_DS_PORT_HPD;
 }
 
+void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp,
+					   const struct intel_crtc_state *crtc_state,
+					   int state)
+{
+	int ret;
+
+	if (!crtc_state->dsc_params.compression_enable)
+		return;
+
+	ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_DSC_ENABLE, state);
+	if (ret < 0)
+		DRM_DEBUG_KMS("Failed to %s sink decompression state\n",
+			      state == DP_DECOMPRESSION_EN ? "enable" : "disable");
+}
+
 /* If the sink supports it, try to set the power state appropriately */
 void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode)
 {
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index c4be4ba7adac..4f5d17bcd54e 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1786,6 +1786,9 @@ void intel_dp_stop_link_train(struct intel_dp *intel_dp);
 int intel_dp_retrain_link(struct intel_encoder *encoder,
 			  struct drm_modeset_acquire_ctx *ctx);
 void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode);
+void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp,
+					   const struct intel_crtc_state *crtc_state,
+					   int state);
 void intel_dp_encoder_reset(struct drm_encoder *encoder);
 void intel_dp_encoder_suspend(struct intel_encoder *intel_encoder);
 void intel_dp_encoder_destroy(struct drm_encoder *encoder);
-- 
2.18.0

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Re: [PATCH v6 18/28] drm/i915/dp: Enable/Disable DSC in DP Sink

[Ville Syrjälä]

On Wed, Oct 24, 2018 at 03:28:30PM -0700, Manasi Navare wrote:
> From: Gaurav K Singh <gaurav.k.singh@intel.com>
> 
> This patch enables decompression support in sink device
> before link training and disables the same during the
> DDI disabling.
> 
> v2:(From Manasi)
> * Change the enable/disable function to take crtc_state
> instead of intel_dp as an argument (Manasi)
> * Use the compression_enable flag as part of crtc_state (Manasi)
> 
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_ddi.c |  5 +++++
>  drivers/gpu/drm/i915/intel_dp.c  | 15 +++++++++++++++
>  drivers/gpu/drm/i915/intel_drv.h |  3 +++
>  3 files changed, 23 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index e40a8c97d34b..1de0a3917d7f 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -2930,6 +2930,8 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
>  	intel_ddi_init_dp_buf_reg(encoder);
>  	if (!is_mst)
>  		intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
> +	intel_dp_sink_set_decompression_state(intel_dp, crtc_state,
> +					      DP_DECOMPRESSION_EN);
>  	intel_dp_start_link_train(intel_dp);
>  	if (port != PORT_A || INTEL_GEN(dev_priv) >= 9)
>  		intel_dp_stop_link_train(intel_dp);
> @@ -3272,6 +3274,9 @@ static void intel_disable_ddi_dp(struct intel_encoder *encoder,
>  	intel_edp_drrs_disable(intel_dp, old_crtc_state);
>  	intel_psr_disable(intel_dp, old_crtc_state);
>  	intel_edp_backlight_off(old_conn_state);
> +	/* Disable the decompression in DP Sink */
> +	intel_dp_sink_set_decompression_state(intel_dp, old_crtc_state,
> +					      ~DP_DECOMPRESSION_EN);

That looks suspicious.

I can't figure out what value you're actually passing here since I
can't find the definiiton of DP_DECOMPRESSION_EN anywhere.

>  }
>  
>  static void intel_disable_ddi_hdmi(struct intel_encoder *encoder,
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 35162c3bc811..72e6605f0ed7 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3005,6 +3005,21 @@ static bool downstream_hpd_needs_d0(struct intel_dp *intel_dp)
>  		intel_dp->downstream_ports[0] & DP_DS_PORT_HPD;
>  }
>  
> +void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp,
> +					   const struct intel_crtc_state *crtc_state,
> +					   int state)
> +{
> +	int ret;
> +
> +	if (!crtc_state->dsc_params.compression_enable)
> +		return;
> +
> +	ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_DSC_ENABLE, state);
> +	if (ret < 0)
> +		DRM_DEBUG_KMS("Failed to %s sink decompression state\n",
> +			      state == DP_DECOMPRESSION_EN ? "enable" : "disable");
> +}
> +
>  /* If the sink supports it, try to set the power state appropriately */
>  void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode)
>  {
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index c4be4ba7adac..4f5d17bcd54e 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1786,6 +1786,9 @@ void intel_dp_stop_link_train(struct intel_dp *intel_dp);
>  int intel_dp_retrain_link(struct intel_encoder *encoder,
>  			  struct drm_modeset_acquire_ctx *ctx);
>  void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode);
> +void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp,
> +					   const struct intel_crtc_state *crtc_state,
> +					   int state);
>  void intel_dp_encoder_reset(struct drm_encoder *encoder);
>  void intel_dp_encoder_suspend(struct intel_encoder *intel_encoder);
>  void intel_dp_encoder_destroy(struct drm_encoder *encoder);
> -- 
> 2.18.0

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 18/28] drm/i915/dp: Enable/Disable DSC in DP Sink

[Manasi Navare]

On Thu, Oct 25, 2018 at 05:03:06PM +0300, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:30PM -0700, Manasi Navare wrote:
> > From: Gaurav K Singh <gaurav.k.singh@intel.com>
> > 
> > This patch enables decompression support in sink device
> > before link training and disables the same during the
> > DDI disabling.
> > 
> > v2:(From Manasi)
> > * Change the enable/disable function to take crtc_state
> > instead of intel_dp as an argument (Manasi)
> > * Use the compression_enable flag as part of crtc_state (Manasi)
> > 
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
> > Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_ddi.c |  5 +++++
> >  drivers/gpu/drm/i915/intel_dp.c  | 15 +++++++++++++++
> >  drivers/gpu/drm/i915/intel_drv.h |  3 +++
> >  3 files changed, 23 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> > index e40a8c97d34b..1de0a3917d7f 100644
> > --- a/drivers/gpu/drm/i915/intel_ddi.c
> > +++ b/drivers/gpu/drm/i915/intel_ddi.c
> > @@ -2930,6 +2930,8 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
> >  	intel_ddi_init_dp_buf_reg(encoder);
> >  	if (!is_mst)
> >  		intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
> > +	intel_dp_sink_set_decompression_state(intel_dp, crtc_state,
> > +					      DP_DECOMPRESSION_EN);
> >  	intel_dp_start_link_train(intel_dp);
> >  	if (port != PORT_A || INTEL_GEN(dev_priv) >= 9)
> >  		intel_dp_stop_link_train(intel_dp);
> > @@ -3272,6 +3274,9 @@ static void intel_disable_ddi_dp(struct intel_encoder *encoder,
> >  	intel_edp_drrs_disable(intel_dp, old_crtc_state);
> >  	intel_psr_disable(intel_dp, old_crtc_state);
> >  	intel_edp_backlight_off(old_conn_state);
> > +	/* Disable the decompression in DP Sink */
> > +	intel_dp_sink_set_decompression_state(intel_dp, old_crtc_state,
> > +					      ~DP_DECOMPRESSION_EN);
> 
> That looks suspicious.
> 
> I can't figure out what value you're actually passing here since I
> can't find the definiiton of DP_DECOMPRESSION_EN anywhere.

This is defined in /include/drm/drm_dp_helper.h

Manasi

> 
> >  }
> >  
> >  static void intel_disable_ddi_hdmi(struct intel_encoder *encoder,
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > index 35162c3bc811..72e6605f0ed7 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -3005,6 +3005,21 @@ static bool downstream_hpd_needs_d0(struct intel_dp *intel_dp)
> >  		intel_dp->downstream_ports[0] & DP_DS_PORT_HPD;
> >  }
> >  
> > +void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp,
> > +					   const struct intel_crtc_state *crtc_state,
> > +					   int state)
> > +{
> > +	int ret;
> > +
> > +	if (!crtc_state->dsc_params.compression_enable)
> > +		return;
> > +
> > +	ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_DSC_ENABLE, state);
> > +	if (ret < 0)
> > +		DRM_DEBUG_KMS("Failed to %s sink decompression state\n",
> > +			      state == DP_DECOMPRESSION_EN ? "enable" : "disable");
> > +}
> > +
> >  /* If the sink supports it, try to set the power state appropriately */
> >  void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode)
> >  {
> > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > index c4be4ba7adac..4f5d17bcd54e 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -1786,6 +1786,9 @@ void intel_dp_stop_link_train(struct intel_dp *intel_dp);
> >  int intel_dp_retrain_link(struct intel_encoder *encoder,
> >  			  struct drm_modeset_acquire_ctx *ctx);
> >  void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode);
> > +void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp,
> > +					   const struct intel_crtc_state *crtc_state,
> > +					   int state);
> >  void intel_dp_encoder_reset(struct drm_encoder *encoder);
> >  void intel_dp_encoder_suspend(struct intel_encoder *intel_encoder);
> >  void intel_dp_encoder_destroy(struct drm_encoder *encoder);
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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[PATCH v6 19/28] drm/i915/dsc: Add a power domain for VDSC on eDP/MIPI DSI

[Manasi Navare]

On Icelake, a separate power well PG2 is created for
VDSC engine used for eDP/MIPI DSI. This patch adds a new
display power domain for Power well 2.

v3:
* Call it POWER_DOMAIN_TRANSCODER_EDP_VDSC (Ville)
* Move it around TRANSCODER power domain defs (Ville)

v2:
* Fix the power well mismatch CI error (Ville)
* Rename as VDSC_PIPE_A (Imre)
* Fix a whitespace (Anusha)
* Fix Comments (Imre)

Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Ville Syrjala <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.h    | 1 +
 drivers/gpu/drm/i915/intel_runtime_pm.c | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
index b0b23e1e9392..4e6b824ccc8c 100644
--- a/drivers/gpu/drm/i915/intel_display.h
+++ b/drivers/gpu/drm/i915/intel_display.h
@@ -226,6 +226,7 @@ enum intel_display_power_domain {
 	POWER_DOMAIN_TRANSCODER_B,
 	POWER_DOMAIN_TRANSCODER_C,
 	POWER_DOMAIN_TRANSCODER_EDP,
+	POWER_DOMAIN_TRANSCODER_EDP_VDSC,
 	POWER_DOMAIN_TRANSCODER_DSI_A,
 	POWER_DOMAIN_TRANSCODER_DSI_C,
 	POWER_DOMAIN_PORT_DDI_A_LANES,
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 5f5416eb9644..050c27f874e0 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -76,6 +76,8 @@ intel_display_power_domain_str(enum intel_display_power_domain domain)
 		return "TRANSCODER_C";
 	case POWER_DOMAIN_TRANSCODER_EDP:
 		return "TRANSCODER_EDP";
+	case POWER_DOMAIN_TRANSCODER_EDP_VDSC:
+		return "TRANSCODER_EDP_VDSC";
 	case POWER_DOMAIN_TRANSCODER_DSI_A:
 		return "TRANSCODER_DSI_A";
 	case POWER_DOMAIN_TRANSCODER_DSI_C:
@@ -1980,9 +1982,9 @@ void intel_display_power_put(struct drm_i915_private *dev_priv,
 	 */
 #define ICL_PW_2_POWER_DOMAINS (			\
 	ICL_PW_3_POWER_DOMAINS |			\
+	BIT_ULL(POWER_DOMAIN_TRANSCODER_EDP_VDSC) |		\
 	BIT_ULL(POWER_DOMAIN_INIT))
 	/*
-	 * - eDP/DSI VDSC
 	 * - KVMR (HW control)
 	 */
 #define ICL_DISPLAY_DC_OFF_POWER_DOMAINS (		\
-- 
2.18.0

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[PATCH v6 20/28] drm/i915/dp: Configure i915 Picture parameter Set registers during DSC enabling

[Manasi Navare]

After encoder->pre_enable() hook, after link training sequence is
completed, PPS registers for DSC encoder are configured using the
DSC state parameters in intel_crtc_state as part of DSC enabling
routine in the source. DSC enabling routine is called after
encoder->pre_enable() before enbaling the pipe and after
compression is enabled on the sink.

v4:
* Use cpu_transcoder instead of encoder->type for using EDP transcoder
DSC registers(Ville)
* Keep all PSS regs together (Anusha)

v3:
* Configure Pic_width/2 for each VDSC engine when two VDSC engines per pipe
are used (Manasi)
* Add DSC slice_row_per_frame in PPS16 (Manasi)

v2:
* Enable PG2 power well for VDSC on eDP

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h      |   2 +
 drivers/gpu/drm/i915/intel_display.c |   6 +
 drivers/gpu/drm/i915/intel_vdsc.c    | 419 +++++++++++++++++++++++++++
 3 files changed, 427 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 45fd7894722b..16e6bb98eb1b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3487,6 +3487,8 @@ extern void intel_rps_mark_interactive(struct drm_i915_private *i915,
 				       bool interactive);
 extern bool intel_set_memory_cxsr(struct drm_i915_private *dev_priv,
 				  bool enable);
+extern void intel_dsc_enable(struct intel_encoder *encoder,
+			     struct intel_crtc_state *crtc_state);
 
 int i915_reg_read_ioctl(struct drm_device *dev, void *data,
 			struct drm_file *file);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 18737bd82b68..023a9baef101 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5433,6 +5433,12 @@ static void intel_encoders_pre_enable(struct drm_crtc *crtc,
 
 		if (encoder->pre_enable)
 			encoder->pre_enable(encoder, crtc_state, conn_state);
+
+		/*
+		 * Enable and Configure Display Stream Compression in the source
+		 * if enabled in intel_crtc_state.
+		 */
+		intel_dsc_enable(encoder, crtc_state);
 	}
 }
 
diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
index e6168a1899e1..b0fc716bbbfd 100644
--- a/drivers/gpu/drm/i915/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/intel_vdsc.c
@@ -580,3 +580,422 @@ int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
 
 	return 0;
 }
+
+static void intel_configure_pps_for_dsc_encoder(struct intel_encoder *encoder,
+						struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct drm_dsc_config *vdsc_cfg = &crtc_state->dp_dsc_cfg;
+	enum pipe pipe = crtc->pipe;
+	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+	u32 pps_val = 0;
+	u32 rc_buf_thresh_dword[4];
+	u32 rc_range_params_dword[8];
+	u8 num_vdsc_instances = (crtc_state->dsc_params.dsc_split) ? 2 : 1;
+	int i = 0;
+
+	/* Populate PICTURE_PARAMETER_SET_0 registers */
+	pps_val = DSC_VER_MAJ | vdsc_cfg->dsc_version_minor <<
+		DSC_VER_MIN_SHIFT |
+		vdsc_cfg->bits_per_component << DSC_BPC_SHIFT |
+		vdsc_cfg->line_buf_depth << DSC_LINE_BUF_DEPTH_SHIFT;
+	if (vdsc_cfg->block_pred_enable)
+		pps_val |= DSC_BLOCK_PREDICTION;
+	else
+		pps_val &= ~DSC_BLOCK_PREDICTION;
+	if (vdsc_cfg->convert_rgb)
+		pps_val |= DSC_COLOR_SPACE_CONVERSION;
+	else
+		pps_val &= ~DSC_COLOR_SPACE_CONVERSION;
+	if (vdsc_cfg->enable422)
+		pps_val |= DSC_422_ENABLE;
+	else
+		pps_val &= ~DSC_422_ENABLE;
+	if (vdsc_cfg->vbr_enable)
+		pps_val |= DSC_VBR_ENABLE;
+	else
+		pps_val &= ~DSC_VBR_ENABLE;
+
+	DRM_INFO("PPS0 = 0x%08x\n", pps_val);
+	 if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_0, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_0, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_0(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_0(pipe),
+				   pps_val);
+	}
+
+	/* Populate PICTURE_PARAMETER_SET_1 registers */
+	pps_val = 0;
+	pps_val |= DSC_BPP(vdsc_cfg->bits_per_pixel);
+	DRM_INFO("PPS1 = 0x%08x\n", pps_val);
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_1, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_1, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_1(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_1(pipe),
+				   pps_val);
+	}
+
+	/* Populate PICTURE_PARAMETER_SET_2 registers */
+	pps_val = 0;
+	pps_val |= DSC_PIC_HEIGHT(vdsc_cfg->pic_height) |
+		DSC_PIC_WIDTH(vdsc_cfg->pic_width / num_vdsc_instances);
+	DRM_INFO("PPS2 = 0x%08x\n", pps_val);
+	if (encoder->type == INTEL_OUTPUT_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_2, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_2, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_2(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_2(pipe),
+				   pps_val);
+	}
+
+	/* Populate PICTURE_PARAMETER_SET_3 registers */
+	pps_val = 0;
+	pps_val |= DSC_SLICE_HEIGHT(vdsc_cfg->slice_height) |
+		DSC_SLICE_WIDTH(vdsc_cfg->slice_width);
+	DRM_INFO("PPS3 = 0x%08x\n", pps_val);
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_3, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_3, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_3(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_3(pipe),
+				   pps_val);
+	}
+
+	/* Populate PICTURE_PARAMETER_SET_4 registers */
+	pps_val = 0;
+	pps_val |= DSC_INITIAL_XMIT_DELAY(vdsc_cfg->initial_xmit_delay) |
+		DSC_INITIAL_DEC_DELAY(vdsc_cfg->initial_dec_delay);
+	DRM_INFO("PPS4 = 0x%08x\n", pps_val);
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_4, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_4, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_4(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_4(pipe),
+				   pps_val);
+	}
+
+	/* Populate PICTURE_PARAMETER_SET_5 registers */
+	pps_val = 0;
+	pps_val |= DSC_SCALE_INC_INT(vdsc_cfg->scale_increment_interval) |
+		DSC_SCALE_DEC_INT(vdsc_cfg->scale_decrement_interval);
+	DRM_INFO("PPS5 = 0x%08x\n", pps_val);
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_5, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_5, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_5(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_5(pipe),
+				   pps_val);
+	}
+
+	/* Populate PICTURE_PARAMETER_SET_6 registers */
+	pps_val = 0;
+	pps_val |= DSC_INITIAL_SCALE_VALUE(vdsc_cfg->initial_scale_value) |
+		DSC_FIRST_LINE_BPG_OFFSET(vdsc_cfg->first_line_bpg_offset) |
+		DSC_FLATNESS_MIN_QP(vdsc_cfg->flatness_min_qp) |
+		DSC_FLATNESS_MAX_QP(vdsc_cfg->flatness_max_qp);
+	DRM_INFO("PPS6 = 0x%08x\n", pps_val);
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_6, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_6, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_6(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_6(pipe),
+				   pps_val);
+	}
+
+	/* Populate PICTURE_PARAMETER_SET_7 registers */
+	pps_val = 0;
+	pps_val |= DSC_SLICE_BPG_OFFSET(vdsc_cfg->slice_bpg_offset) |
+		DSC_NFL_BPG_OFFSET(vdsc_cfg->nfl_bpg_offset);
+	DRM_INFO("PPS7 = 0x%08x\n", pps_val);
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_7, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_7, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_7(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_7(pipe),
+				   pps_val);
+	}
+
+	/* Populate PICTURE_PARAMETER_SET_8 registers */
+	pps_val = 0;
+	pps_val |= DSC_FINAL_OFFSET(vdsc_cfg->final_offset) |
+		DSC_INITIAL_OFFSET(vdsc_cfg->initial_offset);
+	DRM_INFO("PPS8 = 0x%08x\n", pps_val);
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_8, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_8, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_8(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_8(pipe),
+				   pps_val);
+	}
+
+	/* Populate PICTURE_PARAMETER_SET_9 registers */
+	pps_val = 0;
+	pps_val |= DSC_RC_MODEL_SIZE(DSC_RC_MODEL_SIZE_CONST) |
+		DSC_RC_EDGE_FACTOR(DSC_RC_EDGE_FACTOR_CONST);
+	DRM_INFO("PPS9 = 0x%08x\n", pps_val);
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_9, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_9, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_9(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_9(pipe),
+				   pps_val);
+	}
+
+	/* Populate PICTURE_PARAMETER_SET_10 registers */
+	pps_val = 0;
+	pps_val |= DSC_RC_QUANT_INC_LIMIT0(vdsc_cfg->rc_quant_incr_limit0) |
+		DSC_RC_QUANT_INC_LIMIT1(vdsc_cfg->rc_quant_incr_limit1) |
+		DSC_RC_TARGET_OFF_HIGH(DSC_RC_TGT_OFFSET_HI_CONST) |
+		DSC_RC_TARGET_OFF_LOW(DSC_RC_TGT_OFFSET_LO_CONST);
+	DRM_INFO("PPS10 = 0x%08x\n", pps_val);
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_10, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_10, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_10(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_10(pipe),
+				   pps_val);
+	}
+
+	/* Populate Picture parameter set 16 */
+	pps_val = 0;
+	pps_val |= DSC_SLICE_CHUNK_SIZE(vdsc_cfg->slice_chunk_size) |
+		DSC_SLICE_PER_LINE((vdsc_cfg->pic_width / num_vdsc_instances) /
+				   vdsc_cfg->slice_width) |
+		DSC_SLICE_ROW_PER_FRAME(vdsc_cfg->pic_height /
+					vdsc_cfg->slice_height);
+	DRM_INFO("PPS16 = 0x%08x\n", pps_val);
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_PICTURE_PARAMETER_SET_16, pps_val);
+		/*
+		 * If 2 VDSC instances are needed, configure PPS for second
+		 * VDSC
+		 */
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(DSCC_PICTURE_PARAMETER_SET_16, pps_val);
+	} else {
+		I915_WRITE(ICL_DSC0_PICTURE_PARAMETER_SET_16(pipe), pps_val);
+		if (crtc_state->dsc_params.dsc_split)
+			I915_WRITE(ICL_DSC1_PICTURE_PARAMETER_SET_16(pipe),
+				   pps_val);
+	}
+
+	/* Populate the RC_BUF_THRESH registers */
+	memset(rc_buf_thresh_dword, 0, sizeof(rc_buf_thresh_dword));
+	for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++) {
+		rc_buf_thresh_dword[i/4] |= (u32)(vdsc_cfg->rc_buf_thresh[i] <<
+						  BITS_PER_BYTE * (i % 4));
+		DRM_INFO(" RC_BUF_THRESH%d = 0x%08x\n", i,
+			 rc_buf_thresh_dword[i/4]);
+	}
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_RC_BUF_THRESH_0, rc_buf_thresh_dword[0]);
+		I915_WRITE(DSCA_RC_BUF_THRESH_0_UDW, rc_buf_thresh_dword[1]);
+		I915_WRITE(DSCA_RC_BUF_THRESH_1, rc_buf_thresh_dword[2]);
+		I915_WRITE(DSCA_RC_BUF_THRESH_1_UDW, rc_buf_thresh_dword[3]);
+		if (crtc_state->dsc_params.dsc_split) {
+			I915_WRITE(DSCC_RC_BUF_THRESH_0,
+				   rc_buf_thresh_dword[0]);
+			I915_WRITE(DSCC_RC_BUF_THRESH_0_UDW,
+				   rc_buf_thresh_dword[1]);
+			I915_WRITE(DSCC_RC_BUF_THRESH_1,
+				   rc_buf_thresh_dword[2]);
+			I915_WRITE(DSCC_RC_BUF_THRESH_1_UDW,
+				   rc_buf_thresh_dword[3]);
+		}
+	} else {
+		I915_WRITE(ICL_DSC0_RC_BUF_THRESH_0(pipe),
+			   rc_buf_thresh_dword[0]);
+		I915_WRITE(ICL_DSC0_RC_BUF_THRESH_0_UDW(pipe),
+			   rc_buf_thresh_dword[1]);
+		I915_WRITE(ICL_DSC0_RC_BUF_THRESH_1(pipe),
+			   rc_buf_thresh_dword[2]);
+		I915_WRITE(ICL_DSC0_RC_BUF_THRESH_1_UDW(pipe),
+			   rc_buf_thresh_dword[3]);
+		if (crtc_state->dsc_params.dsc_split) {
+			I915_WRITE(ICL_DSC1_RC_BUF_THRESH_0(pipe),
+				   rc_buf_thresh_dword[0]);
+			I915_WRITE(ICL_DSC1_RC_BUF_THRESH_0_UDW(pipe),
+				   rc_buf_thresh_dword[1]);
+			I915_WRITE(ICL_DSC1_RC_BUF_THRESH_1(pipe),
+				   rc_buf_thresh_dword[2]);
+			I915_WRITE(ICL_DSC1_RC_BUF_THRESH_1_UDW(pipe),
+				   rc_buf_thresh_dword[3]);
+		}
+	}
+
+	/* Populate the RC_RANGE_PARAMETERS registers */
+	memset(rc_range_params_dword, 0, sizeof(rc_range_params_dword));
+	for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
+		rc_range_params_dword[i/2] |= (u32)(((vdsc_cfg->rc_range_params[i].range_bpg_offset <<
+						      RC_BPG_OFFSET_SHIFT) |
+						     (vdsc_cfg->rc_range_params[i].range_max_qp <<
+						      RC_MAX_QP_SHIFT) |
+						     (vdsc_cfg->rc_range_params[i].range_min_qp <<
+						      RC_MIN_QP_SHIFT)) << 16 * (i % 2));
+		DRM_INFO(" RC_RANGE_PARAM_%d = 0x%08x\n", i,
+			 rc_range_params_dword[i/2]);
+	}
+	if (cpu_transcoder == TRANSCODER_EDP) {
+		I915_WRITE(DSCA_RC_RANGE_PARAMETERS_0,
+			   rc_range_params_dword[0]);
+		I915_WRITE(DSCA_RC_RANGE_PARAMETERS_0_UDW,
+			   rc_range_params_dword[1]);
+		I915_WRITE(DSCA_RC_RANGE_PARAMETERS_1,
+			   rc_range_params_dword[2]);
+		I915_WRITE(DSCA_RC_RANGE_PARAMETERS_1_UDW,
+			   rc_range_params_dword[3]);
+		I915_WRITE(DSCA_RC_RANGE_PARAMETERS_2,
+			   rc_range_params_dword[4]);
+		I915_WRITE(DSCA_RC_RANGE_PARAMETERS_2_UDW,
+			   rc_range_params_dword[5]);
+		I915_WRITE(DSCA_RC_RANGE_PARAMETERS_3,
+			   rc_range_params_dword[6]);
+		I915_WRITE(DSCA_RC_RANGE_PARAMETERS_3_UDW,
+			   rc_range_params_dword[7]);
+		if (crtc_state->dsc_params.dsc_split) {
+			I915_WRITE(DSCC_RC_RANGE_PARAMETERS_0,
+				   rc_range_params_dword[0]);
+			I915_WRITE(DSCC_RC_RANGE_PARAMETERS_0_UDW,
+				   rc_range_params_dword[1]);
+			I915_WRITE(DSCC_RC_RANGE_PARAMETERS_1,
+				   rc_range_params_dword[2]);
+			I915_WRITE(DSCC_RC_RANGE_PARAMETERS_1_UDW,
+				   rc_range_params_dword[3]);
+			I915_WRITE(DSCC_RC_RANGE_PARAMETERS_2,
+				   rc_range_params_dword[4]);
+			I915_WRITE(DSCC_RC_RANGE_PARAMETERS_2_UDW,
+				   rc_range_params_dword[5]);
+			I915_WRITE(DSCC_RC_RANGE_PARAMETERS_3,
+				   rc_range_params_dword[6]);
+			I915_WRITE(DSCC_RC_RANGE_PARAMETERS_3_UDW,
+				   rc_range_params_dword[7]);
+		}
+	} else {
+		I915_WRITE(ICL_DSC0_RC_RANGE_PARAMETERS_0(pipe),
+			   rc_range_params_dword[0]);
+		I915_WRITE(ICL_DSC0_RC_RANGE_PARAMETERS_0_UDW(pipe),
+			   rc_range_params_dword[1]);
+		I915_WRITE(ICL_DSC0_RC_RANGE_PARAMETERS_1(pipe),
+			   rc_range_params_dword[2]);
+		I915_WRITE(ICL_DSC0_RC_RANGE_PARAMETERS_1_UDW(pipe),
+			   rc_range_params_dword[3]);
+		I915_WRITE(ICL_DSC0_RC_RANGE_PARAMETERS_2(pipe),
+			   rc_range_params_dword[4]);
+		I915_WRITE(ICL_DSC0_RC_RANGE_PARAMETERS_2_UDW(pipe),
+			   rc_range_params_dword[5]);
+		I915_WRITE(ICL_DSC0_RC_RANGE_PARAMETERS_3(pipe),
+			   rc_range_params_dword[6]);
+		I915_WRITE(ICL_DSC0_RC_RANGE_PARAMETERS_3_UDW(pipe),
+			   rc_range_params_dword[7]);
+		if (crtc_state->dsc_params.dsc_split) {
+			I915_WRITE(ICL_DSC1_RC_RANGE_PARAMETERS_0(pipe),
+				   rc_range_params_dword[0]);
+			I915_WRITE(ICL_DSC1_RC_RANGE_PARAMETERS_0_UDW(pipe),
+				   rc_range_params_dword[1]);
+			I915_WRITE(ICL_DSC1_RC_RANGE_PARAMETERS_1(pipe),
+				   rc_range_params_dword[2]);
+			I915_WRITE(ICL_DSC1_RC_RANGE_PARAMETERS_1_UDW(pipe),
+				   rc_range_params_dword[3]);
+			I915_WRITE(ICL_DSC1_RC_RANGE_PARAMETERS_2(pipe),
+				   rc_range_params_dword[4]);
+			I915_WRITE(ICL_DSC1_RC_RANGE_PARAMETERS_2_UDW(pipe),
+				   rc_range_params_dword[5]);
+			I915_WRITE(ICL_DSC1_RC_RANGE_PARAMETERS_3(pipe),
+				   rc_range_params_dword[6]);
+			I915_WRITE(ICL_DSC1_RC_RANGE_PARAMETERS_3_UDW(pipe),
+				   rc_range_params_dword[7]);
+		}
+	}
+}
+
+void intel_dsc_enable(struct intel_encoder *encoder,
+		      struct intel_crtc_state *crtc_state)
+{
+
+	if (!crtc_state->dsc_params.compression_enable)
+		return;
+
+	intel_configure_pps_for_dsc_encoder(encoder, crtc_state);
+
+	return;
+}
-- 
2.18.0

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[PATCH v6 21/28] drm/i915/dp: Use the existing write_infoframe() for DSC PPS SDPs

[Manasi Navare]

Infoframes are used to send secondary data packets. This patch
adds support for DSC Picture parameter set secondary data packets
in the existing write_infoframe helpers.

v2:
* Rebase on drm-tip (Manasi)

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h   |  1 +
 drivers/gpu/drm/i915/intel_hdmi.c | 23 +++++++++++++++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 64cca0a83cf7..0ecdc95f56d8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4545,6 +4545,7 @@ enum {
  * of the infoframe structure specified by CEA-861. */
 #define   VIDEO_DIP_DATA_SIZE	32
 #define   VIDEO_DIP_VSC_DATA_SIZE	36
+#define   VIDEO_DIP_PPS_DATA_SIZE	132
 #define VIDEO_DIP_CTL		_MMIO(0x61170)
 /* Pre HSW: */
 #define   VIDEO_DIP_ENABLE		(1 << 31)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index d3e653640ce7..02fb54737d92 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -115,6 +115,8 @@ static u32 hsw_infoframe_enable(unsigned int type)
 	switch (type) {
 	case DP_SDP_VSC:
 		return VIDEO_DIP_ENABLE_VSC_HSW;
+	case DP_SDP_PPS:
+		return VDIP_ENABLE_PPS;
 	case HDMI_INFOFRAME_TYPE_AVI:
 		return VIDEO_DIP_ENABLE_AVI_HSW;
 	case HDMI_INFOFRAME_TYPE_SPD:
@@ -136,6 +138,8 @@ hsw_dip_data_reg(struct drm_i915_private *dev_priv,
 	switch (type) {
 	case DP_SDP_VSC:
 		return HSW_TVIDEO_DIP_VSC_DATA(cpu_transcoder, i);
+	case DP_SDP_PPS:
+		return ICL_VIDEO_DIP_PPS_DATA(cpu_transcoder, i);
 	case HDMI_INFOFRAME_TYPE_AVI:
 		return HSW_TVIDEO_DIP_AVI_DATA(cpu_transcoder, i);
 	case HDMI_INFOFRAME_TYPE_SPD:
@@ -148,6 +152,18 @@ hsw_dip_data_reg(struct drm_i915_private *dev_priv,
 	}
 }
 
+static int hsw_dip_data_size(unsigned int type)
+{
+	switch (type) {
+	case DP_SDP_VSC:
+		return VIDEO_DIP_VSC_DATA_SIZE;
+	case DP_SDP_PPS:
+		return VIDEO_DIP_PPS_DATA_SIZE;
+	default:
+		return VIDEO_DIP_DATA_SIZE;
+	}
+}
+
 static void g4x_write_infoframe(struct intel_encoder *encoder,
 				const struct intel_crtc_state *crtc_state,
 				unsigned int type,
@@ -382,11 +398,14 @@ static void hsw_write_infoframe(struct intel_encoder *encoder,
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 	i915_reg_t ctl_reg = HSW_TVIDEO_DIP_CTL(cpu_transcoder);
-	int data_size = type == DP_SDP_VSC ?
-		VIDEO_DIP_VSC_DATA_SIZE : VIDEO_DIP_DATA_SIZE;
+	i915_reg_t data_reg;
+	int data_size = 0;
 	int i;
 	u32 val = I915_READ(ctl_reg);
 
+	data_size = hsw_dip_data_size(type);
+	data_reg = hsw_dip_data_reg(dev_priv, cpu_transcoder, type, 0);
+
 	val &= ~hsw_infoframe_enable(type);
 	I915_WRITE(ctl_reg, val);
 
-- 
2.18.0

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Re: [PATCH v6 21/28] drm/i915/dp: Use the existing write_infoframe() for DSC PPS SDPs

[Ville Syrjälä]

On Wed, Oct 24, 2018 at 03:28:33PM -0700, Manasi Navare wrote:
> Infoframes are used to send secondary data packets. This patch
> adds support for DSC Picture parameter set secondary data packets
> in the existing write_infoframe helpers.
> 
> v2:
> * Rebase on drm-tip (Manasi)
> 
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h   |  1 +
>  drivers/gpu/drm/i915/intel_hdmi.c | 23 +++++++++++++++++++++--
>  2 files changed, 22 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 64cca0a83cf7..0ecdc95f56d8 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4545,6 +4545,7 @@ enum {
>   * of the infoframe structure specified by CEA-861. */
>  #define   VIDEO_DIP_DATA_SIZE	32
>  #define   VIDEO_DIP_VSC_DATA_SIZE	36
> +#define   VIDEO_DIP_PPS_DATA_SIZE	132
>  #define VIDEO_DIP_CTL		_MMIO(0x61170)
>  /* Pre HSW: */
>  #define   VIDEO_DIP_ENABLE		(1 << 31)
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index d3e653640ce7..02fb54737d92 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -115,6 +115,8 @@ static u32 hsw_infoframe_enable(unsigned int type)
>  	switch (type) {
>  	case DP_SDP_VSC:
>  		return VIDEO_DIP_ENABLE_VSC_HSW;
> +	case DP_SDP_PPS:
> +		return VDIP_ENABLE_PPS;

Hmm. Why is that bit named so differently to the rest?

>  	case HDMI_INFOFRAME_TYPE_AVI:
>  		return VIDEO_DIP_ENABLE_AVI_HSW;
>  	case HDMI_INFOFRAME_TYPE_SPD:
> @@ -136,6 +138,8 @@ hsw_dip_data_reg(struct drm_i915_private *dev_priv,
>  	switch (type) {
>  	case DP_SDP_VSC:
>  		return HSW_TVIDEO_DIP_VSC_DATA(cpu_transcoder, i);
> +	case DP_SDP_PPS:
> +		return ICL_VIDEO_DIP_PPS_DATA(cpu_transcoder, i);
>  	case HDMI_INFOFRAME_TYPE_AVI:
>  		return HSW_TVIDEO_DIP_AVI_DATA(cpu_transcoder, i);
>  	case HDMI_INFOFRAME_TYPE_SPD:
> @@ -148,6 +152,18 @@ hsw_dip_data_reg(struct drm_i915_private *dev_priv,
>  	}
>  }
>  
> +static int hsw_dip_data_size(unsigned int type)
> +{
> +	switch (type) {
> +	case DP_SDP_VSC:
> +		return VIDEO_DIP_VSC_DATA_SIZE;
> +	case DP_SDP_PPS:
> +		return VIDEO_DIP_PPS_DATA_SIZE;
> +	default:
> +		return VIDEO_DIP_DATA_SIZE;
> +	}
> +}
> +
>  static void g4x_write_infoframe(struct intel_encoder *encoder,
>  				const struct intel_crtc_state *crtc_state,
>  				unsigned int type,
> @@ -382,11 +398,14 @@ static void hsw_write_infoframe(struct intel_encoder *encoder,
>  	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>  	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
>  	i915_reg_t ctl_reg = HSW_TVIDEO_DIP_CTL(cpu_transcoder);
> -	int data_size = type == DP_SDP_VSC ?
> -		VIDEO_DIP_VSC_DATA_SIZE : VIDEO_DIP_DATA_SIZE;
> +	i915_reg_t data_reg;
> +	int data_size = 0;

=0 is unnecessary.

>  	int i;
>  	u32 val = I915_READ(ctl_reg);
>  
> +	data_size = hsw_dip_data_size(type);
> +	data_reg = hsw_dip_data_reg(dev_priv, cpu_transcoder, type, 0);

data_reg is unused.

> +
>  	val &= ~hsw_infoframe_enable(type);
>  	I915_WRITE(ctl_reg, val);
>  
> -- 
> 2.18.0

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 21/28] drm/i915/dp: Use the existing write_infoframe() for DSC PPS SDPs

[Manasi Navare]

On Thu, Oct 25, 2018 at 05:08:39PM +0300, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:33PM -0700, Manasi Navare wrote:
> > Infoframes are used to send secondary data packets. This patch
> > adds support for DSC Picture parameter set secondary data packets
> > in the existing write_infoframe helpers.
> > 
> > v2:
> > * Rebase on drm-tip (Manasi)
> > 
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_reg.h   |  1 +
> >  drivers/gpu/drm/i915/intel_hdmi.c | 23 +++++++++++++++++++++--
> >  2 files changed, 22 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index 64cca0a83cf7..0ecdc95f56d8 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -4545,6 +4545,7 @@ enum {
> >   * of the infoframe structure specified by CEA-861. */
> >  #define   VIDEO_DIP_DATA_SIZE	32
> >  #define   VIDEO_DIP_VSC_DATA_SIZE	36
> > +#define   VIDEO_DIP_PPS_DATA_SIZE	132
> >  #define VIDEO_DIP_CTL		_MMIO(0x61170)
> >  /* Pre HSW: */
> >  #define   VIDEO_DIP_ENABLE		(1 << 31)
> > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> > index d3e653640ce7..02fb54737d92 100644
> > --- a/drivers/gpu/drm/i915/intel_hdmi.c
> > +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> > @@ -115,6 +115,8 @@ static u32 hsw_infoframe_enable(unsigned int type)
> >  	switch (type) {
> >  	case DP_SDP_VSC:
> >  		return VIDEO_DIP_ENABLE_VSC_HSW;
> > +	case DP_SDP_PPS:
> > +		return VDIP_ENABLE_PPS;
> 
> Hmm. Why is that bit named so differently to the rest?

Will have to address the mess around VDIP_CVTL reg earlier defs in a separate patch set

> 
> >  	case HDMI_INFOFRAME_TYPE_AVI:
> >  		return VIDEO_DIP_ENABLE_AVI_HSW;
> >  	case HDMI_INFOFRAME_TYPE_SPD:
> > @@ -136,6 +138,8 @@ hsw_dip_data_reg(struct drm_i915_private *dev_priv,
> >  	switch (type) {
> >  	case DP_SDP_VSC:
> >  		return HSW_TVIDEO_DIP_VSC_DATA(cpu_transcoder, i);
> > +	case DP_SDP_PPS:
> > +		return ICL_VIDEO_DIP_PPS_DATA(cpu_transcoder, i);
> >  	case HDMI_INFOFRAME_TYPE_AVI:
> >  		return HSW_TVIDEO_DIP_AVI_DATA(cpu_transcoder, i);
> >  	case HDMI_INFOFRAME_TYPE_SPD:
> > @@ -148,6 +152,18 @@ hsw_dip_data_reg(struct drm_i915_private *dev_priv,
> >  	}
> >  }
> >  
> > +static int hsw_dip_data_size(unsigned int type)
> > +{
> > +	switch (type) {
> > +	case DP_SDP_VSC:
> > +		return VIDEO_DIP_VSC_DATA_SIZE;
> > +	case DP_SDP_PPS:
> > +		return VIDEO_DIP_PPS_DATA_SIZE;
> > +	default:
> > +		return VIDEO_DIP_DATA_SIZE;
> > +	}
> > +}
> > +
> >  static void g4x_write_infoframe(struct intel_encoder *encoder,
> >  				const struct intel_crtc_state *crtc_state,
> >  				unsigned int type,
> > @@ -382,11 +398,14 @@ static void hsw_write_infoframe(struct intel_encoder *encoder,
> >  	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> >  	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
> >  	i915_reg_t ctl_reg = HSW_TVIDEO_DIP_CTL(cpu_transcoder);
> > -	int data_size = type == DP_SDP_VSC ?
> > -		VIDEO_DIP_VSC_DATA_SIZE : VIDEO_DIP_DATA_SIZE;
> > +	i915_reg_t data_reg;
> > +	int data_size = 0;
> 
> =0 is unnecessary.

This was added to adderss a warning that data_size is uninitialized.
But will double check again if its really needed.

> 
> >  	int i;
> >  	u32 val = I915_READ(ctl_reg);
> >  
> > +	data_size = hsw_dip_data_size(type);
> > +	data_reg = hsw_dip_data_reg(dev_priv, cpu_transcoder, type, 0);
> 
> data_reg is unused.

Yes I think the cleanup patch series that was sent sometime recently now
uses hsw_dip_data_reg directly in I915_WRITE call.
I will remove the data_reg.

Manasi

> 
> > +
> >  	val &= ~hsw_infoframe_enable(type);
> >  	I915_WRITE(ctl_reg, val);
> >  
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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[PATCH v6 22/28] drm/i915/dp: Populate DSC PPS SDP and send PPS infoframes

[Manasi Navare]

DSC PPS secondary data packet infoframes are filled with
DSC picure parameter set metadata according to the DSC standard.
These infoframes are sent to the sink device and used during DSC
decoding.

v2:
* Rebase ond drm-tip

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/intel_vdsc.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
index b0fc716bbbfd..4b4b812d68f3 100644
--- a/drivers/gpu/drm/i915/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/intel_vdsc.c
@@ -988,6 +988,25 @@ static void intel_configure_pps_for_dsc_encoder(struct intel_encoder *encoder,
 	}
 }
 
+static void intel_dp_send_dsc_pps_sdp(struct intel_encoder *encoder,
+				      struct intel_crtc_state *crtc_state)
+{
+	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+	struct drm_dsc_config *vdsc_cfg = &crtc_state->dp_dsc_cfg;
+	struct drm_dsc_pps_infoframe dp_dsc_pps_sdp;
+
+	/* Prepare DP SDP PPS header as per DP 1.4 spec, Table 2-123 */
+	drm_dsc_dp_pps_header_init(&dp_dsc_pps_sdp);
+
+	/* Fill the PPS payload bytes as per DSC spec 1.2 Table 4-1 */
+	drm_dsc_pps_infoframe_pack(&dp_dsc_pps_sdp, vdsc_cfg);
+
+	intel_dig_port->write_infoframe(encoder, crtc_state,
+					DP_SDP_PPS, &dp_dsc_pps_sdp,
+					sizeof(dp_dsc_pps_sdp));
+}
+
 void intel_dsc_enable(struct intel_encoder *encoder,
 		      struct intel_crtc_state *crtc_state)
 {
@@ -997,5 +1016,7 @@ void intel_dsc_enable(struct intel_encoder *encoder,
 
 	intel_configure_pps_for_dsc_encoder(encoder, crtc_state);
 
+	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
+
 	return;
 }
-- 
2.18.0

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Re: [PATCH v6 22/28] drm/i915/dp: Populate DSC PPS SDP and send PPS infoframes

[Ville Syrjälä]

On Wed, Oct 24, 2018 at 03:28:34PM -0700, Manasi Navare wrote:
> DSC PPS secondary data packet infoframes are filled with
> DSC picure parameter set metadata according to the DSC standard.
> These infoframes are sent to the sink device and used during DSC
> decoding.
> 
> v2:
> * Rebase ond drm-tip
> 
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_vdsc.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> index b0fc716bbbfd..4b4b812d68f3 100644
> --- a/drivers/gpu/drm/i915/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> @@ -988,6 +988,25 @@ static void intel_configure_pps_for_dsc_encoder(struct intel_encoder *encoder,
>  	}
>  }
>  
> +static void intel_dp_send_dsc_pps_sdp(struct intel_encoder *encoder,
> +				      struct intel_crtc_state *crtc_state)

const crtc_state

s/send/write/ ?

> +{
> +	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> +	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
> +	struct drm_dsc_config *vdsc_cfg = &crtc_state->dp_dsc_cfg;
> +	struct drm_dsc_pps_infoframe dp_dsc_pps_sdp;
> +
> +	/* Prepare DP SDP PPS header as per DP 1.4 spec, Table 2-123 */
> +	drm_dsc_dp_pps_header_init(&dp_dsc_pps_sdp);
> +
> +	/* Fill the PPS payload bytes as per DSC spec 1.2 Table 4-1 */
> +	drm_dsc_pps_infoframe_pack(&dp_dsc_pps_sdp, vdsc_cfg);
> +
> +	intel_dig_port->write_infoframe(encoder, crtc_state,
> +					DP_SDP_PPS, &dp_dsc_pps_sdp,
> +					sizeof(dp_dsc_pps_sdp));
> +}
> +
>  void intel_dsc_enable(struct intel_encoder *encoder,
>  		      struct intel_crtc_state *crtc_state)
>  {
> @@ -997,5 +1016,7 @@ void intel_dsc_enable(struct intel_encoder *encoder,
>  
>  	intel_configure_pps_for_dsc_encoder(encoder, crtc_state);
>  
> +	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
> +
>  	return;
>  }
> -- 
> 2.18.0

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 22/28] drm/i915/dp: Populate DSC PPS SDP and send PPS infoframes

[Manasi Navare]

On Thu, Oct 25, 2018 at 05:09:42PM +0300, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:34PM -0700, Manasi Navare wrote:
> > DSC PPS secondary data packet infoframes are filled with
> > DSC picure parameter set metadata according to the DSC standard.
> > These infoframes are sent to the sink device and used during DSC
> > decoding.
> > 
> > v2:
> > * Rebase ond drm-tip
> > 
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_vdsc.c | 21 +++++++++++++++++++++
> >  1 file changed, 21 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> > index b0fc716bbbfd..4b4b812d68f3 100644
> > --- a/drivers/gpu/drm/i915/intel_vdsc.c
> > +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> > @@ -988,6 +988,25 @@ static void intel_configure_pps_for_dsc_encoder(struct intel_encoder *encoder,
> >  	}
> >  }
> >  
> > +static void intel_dp_send_dsc_pps_sdp(struct intel_encoder *encoder,
> > +				      struct intel_crtc_state *crtc_state)
> 
> const crtc_state

Yes wil make this a const
> 
> s/send/write/ ?

Hmm in terms of VDSC, the SDP packet is the one that gets sent to the sink from source
after we write the infoframe.
So I named it as _send_dsc_pps_sdp, but I am okay changing that to write_dsc_pps_sdp
since all we are doing is writing an infoframe that gets sent out.

Manasi

> 
> > +{
> > +	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> > +	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
> > +	struct drm_dsc_config *vdsc_cfg = &crtc_state->dp_dsc_cfg;
> > +	struct drm_dsc_pps_infoframe dp_dsc_pps_sdp;
> > +
> > +	/* Prepare DP SDP PPS header as per DP 1.4 spec, Table 2-123 */
> > +	drm_dsc_dp_pps_header_init(&dp_dsc_pps_sdp);
> > +
> > +	/* Fill the PPS payload bytes as per DSC spec 1.2 Table 4-1 */
> > +	drm_dsc_pps_infoframe_pack(&dp_dsc_pps_sdp, vdsc_cfg);
> > +
> > +	intel_dig_port->write_infoframe(encoder, crtc_state,
> > +					DP_SDP_PPS, &dp_dsc_pps_sdp,
> > +					sizeof(dp_dsc_pps_sdp));
> > +}
> > +
> >  void intel_dsc_enable(struct intel_encoder *encoder,
> >  		      struct intel_crtc_state *crtc_state)
> >  {
> > @@ -997,5 +1016,7 @@ void intel_dsc_enable(struct intel_encoder *encoder,
> >  
> >  	intel_configure_pps_for_dsc_encoder(encoder, crtc_state);
> >  
> > +	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
> > +
> >  	return;
> >  }
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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Re: [PATCH v6 22/28] drm/i915/dp: Populate DSC PPS SDP and send PPS infoframes

[Manasi Navare]

On Thu, Oct 25, 2018 at 05:09:42PM +0300, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:34PM -0700, Manasi Navare wrote:
> > DSC PPS secondary data packet infoframes are filled with
> > DSC picure parameter set metadata according to the DSC standard.
> > These infoframes are sent to the sink device and used during DSC
> > decoding.
> > 
> > v2:
> > * Rebase ond drm-tip
> > 
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_vdsc.c | 21 +++++++++++++++++++++
> >  1 file changed, 21 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> > index b0fc716bbbfd..4b4b812d68f3 100644
> > --- a/drivers/gpu/drm/i915/intel_vdsc.c
> > +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> > @@ -988,6 +988,25 @@ static void intel_configure_pps_for_dsc_encoder(struct intel_encoder *encoder,
> >  	}
> >  }
> >  
> > +static void intel_dp_send_dsc_pps_sdp(struct intel_encoder *encoder,
> > +				      struct intel_crtc_state *crtc_state)
> 
> const crtc_state

Changing this to const crtc_state started giving me an error when I get the
struct drm_dsc_config *vdsc_cfg = &crtc_state->dp_dsc_cfg;

So this is making me think that since dp_dsc_cfg is written during compute_config,
and there on we just read it, we dont need to pass *vdsc_cfg , we can
just pass the struct directly right?

Manasi

> 
> s/send/write/ ?
> 
> > +{
> > +	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> > +	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
> > +	struct drm_dsc_config *vdsc_cfg = &crtc_state->dp_dsc_cfg;
> > +	struct drm_dsc_pps_infoframe dp_dsc_pps_sdp;
> > +
> > +	/* Prepare DP SDP PPS header as per DP 1.4 spec, Table 2-123 */
> > +	drm_dsc_dp_pps_header_init(&dp_dsc_pps_sdp);
> > +
> > +	/* Fill the PPS payload bytes as per DSC spec 1.2 Table 4-1 */
> > +	drm_dsc_pps_infoframe_pack(&dp_dsc_pps_sdp, vdsc_cfg);
> > +
> > +	intel_dig_port->write_infoframe(encoder, crtc_state,
> > +					DP_SDP_PPS, &dp_dsc_pps_sdp,
> > +					sizeof(dp_dsc_pps_sdp));
> > +}
> > +
> >  void intel_dsc_enable(struct intel_encoder *encoder,
> >  		      struct intel_crtc_state *crtc_state)
> >  {
> > @@ -997,5 +1016,7 @@ void intel_dsc_enable(struct intel_encoder *encoder,
> >  
> >  	intel_configure_pps_for_dsc_encoder(encoder, crtc_state);
> >  
> > +	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
> > +
> >  	return;
> >  }
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
> _______________________________________________
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Re: [PATCH v6 22/28] drm/i915/dp: Populate DSC PPS SDP and send PPS infoframes

[Ville Syrjälä]

On Tue, Oct 30, 2018 at 04:45:35PM -0700, Manasi Navare wrote:
> On Thu, Oct 25, 2018 at 05:09:42PM +0300, Ville Syrjälä wrote:
> > On Wed, Oct 24, 2018 at 03:28:34PM -0700, Manasi Navare wrote:
> > > DSC PPS secondary data packet infoframes are filled with
> > > DSC picure parameter set metadata according to the DSC standard.
> > > These infoframes are sent to the sink device and used during DSC
> > > decoding.
> > > 
> > > v2:
> > > * Rebase ond drm-tip
> > > 
> > > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/intel_vdsc.c | 21 +++++++++++++++++++++
> > >  1 file changed, 21 insertions(+)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> > > index b0fc716bbbfd..4b4b812d68f3 100644
> > > --- a/drivers/gpu/drm/i915/intel_vdsc.c
> > > +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> > > @@ -988,6 +988,25 @@ static void intel_configure_pps_for_dsc_encoder(struct intel_encoder *encoder,
> > >  	}
> > >  }
> > >  
> > > +static void intel_dp_send_dsc_pps_sdp(struct intel_encoder *encoder,
> > > +				      struct intel_crtc_state *crtc_state)
> > 
> > const crtc_state
> 
> Changing this to const crtc_state started giving me an error when I get the
> struct drm_dsc_config *vdsc_cfg = &crtc_state->dp_dsc_cfg;

const struct drm_dsc_config ...

> 
> So this is making me think that since dp_dsc_cfg is written during compute_config,
> and there on we just read it, we dont need to pass *vdsc_cfg , we can
> just pass the struct directly right?

Not sure what you're asking here.

> 
> Manasi
> 
> > 
> > s/send/write/ ?
> > 
> > > +{
> > > +	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> > > +	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
> > > +	struct drm_dsc_config *vdsc_cfg = &crtc_state->dp_dsc_cfg;
> > > +	struct drm_dsc_pps_infoframe dp_dsc_pps_sdp;
> > > +
> > > +	/* Prepare DP SDP PPS header as per DP 1.4 spec, Table 2-123 */
> > > +	drm_dsc_dp_pps_header_init(&dp_dsc_pps_sdp);
> > > +
> > > +	/* Fill the PPS payload bytes as per DSC spec 1.2 Table 4-1 */
> > > +	drm_dsc_pps_infoframe_pack(&dp_dsc_pps_sdp, vdsc_cfg);
> > > +
> > > +	intel_dig_port->write_infoframe(encoder, crtc_state,
> > > +					DP_SDP_PPS, &dp_dsc_pps_sdp,
> > > +					sizeof(dp_dsc_pps_sdp));
> > > +}
> > > +
> > >  void intel_dsc_enable(struct intel_encoder *encoder,
> > >  		      struct intel_crtc_state *crtc_state)
> > >  {
> > > @@ -997,5 +1016,7 @@ void intel_dsc_enable(struct intel_encoder *encoder,
> > >  
> > >  	intel_configure_pps_for_dsc_encoder(encoder, crtc_state);
> > >  
> > > +	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
> > > +
> > >  	return;
> > >  }
> > > -- 
> > > 2.18.0
> > 
> > -- 
> > Ville Syrjälä
> > Intel
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Ville Syrjälä
Intel
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[PATCH v6 23/28] drm/i915/icl: Add Display Stream Splitter control registers

[Manasi Navare]

From: "Srivatsa, Anusha" <anusha.srivatsa@intel.com>

Add defines for DSS_CTL registers.
These registers specify the big joiner, splitter,
overlap pixels and info regarding display stream
compression enabled on left or right branch.

v3 (From Manasi):
- Change the hex values to lower case (Madhav)
- Use BIT macro (Manasi)
v2:
- Add define to conditionally check the buffer target depth (James Ausmus)

Suggested-by: Madhav Chauhan <madhav.chauhan@intel.com>
Cc: Madhav Chauhan <madhav.chauhan@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Madhav Chauhan <madhav.chauhan@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0ecdc95f56d8..e85f53cb9cdd 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7721,6 +7721,39 @@ enum {
 #define RC_MAX_QP_SHIFT				5
 #define RC_MIN_QP_SHIFT				0
 
+/* Display Stream Splitter Control */
+#define DSS_CTL1				_MMIO(0x67400)
+#define  SPLITTER_ENABLE			(1 << 31)
+#define  JOINER_ENABLE				(1 << 30)
+#define  DUAL_LINK_MODE_INTERLEAVE		(1 << 24)
+#define  DUAL_LINK_MODE_FRONTBACK		(0 << 24)
+#define  OVERLAP_PIXELS_MASK			(0xf << 16)
+#define  OVERLAP_PIXELS(pixels)			((pixels) << 16)
+#define  LEFT_DL_BUF_TARGET_DEPTH_MASK		(0xfff << 0)
+#define  LEFT_DL_BUF_TARGET_DEPTH(pixels)	((pixels) << 0)
+#define  MAX_DL_BUFFER_TARGET_DEPTH		0x5a0
+
+#define DSS_CTL2				_MMIO(0x67404)
+#define  LEFT_BRANCH_VDSC_ENABLE		(1 << 31)
+#define  RIGHT_BRANCH_VDSC_ENABLE		(1 << 15)
+#define  RIGHT_DL_BUF_TARGET_DEPTH_MASK		(0xfff << 0)
+#define  RIGHT_DL_BUF_TARGET_DEPTH(pixels)	((pixels) << 0)
+
+#define _ICL_PIPE_DSS_CTL1_PB			0x78200
+#define _ICL_PIPE_DSS_CTL1_PC			0x78400
+#define ICL_PIPE_DSS_CTL1(pipe)			_MMIO_PIPE((pipe) - PIPE_B, \
+							   _ICL_PIPE_DSS_CTL1_PB, \
+							   _ICL_PIPE_DSS_CTL1_PC)
+#define  BIG_JOINER_ENABLE			(1 << 29)
+#define  MASTER_BIG_JOINER_ENABLE		(1 << 28)
+#define  VGA_CENTERING_ENABLE			(1 << 27)
+
+#define _ICL_PIPE_DSS_CTL2_PB			0x78204
+#define _ICL_PIPE_DSS_CTL2_PC			0x78404
+#define ICL_PIPE_DSS_CTL2(pipe)			_MMIO_PIPE((pipe) - PIPE_B, \
+							   _ICL_PIPE_DSS_CTL2_PB, \
+							   _ICL_PIPE_DSS_CTL2_PC)
+
 #define DSCA_RC_RANGE_PARAMETERS_1		_MMIO(0x6B248)
 #define DSCA_RC_RANGE_PARAMETERS_1_UDW		_MMIO(0x6B248 + 4)
 #define DSCC_RC_RANGE_PARAMETERS_1		_MMIO(0x6BA48)
-- 
2.18.0

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[PATCH v6 24/28] drm/i915/dp: Configure Display stream splitter registers during DSC enable

[Manasi Navare]

Display Stream Splitter registers need to be programmed to enable
the joiner if two DSC engines are used and also to enable
the left and the right DSC engines. This happens as part of
the DSC enabling routine in the source in atomic commit.

v3:
* Use cpu_transcoder instead of encoder->type (Ville)
v2:
* Rebase (Manasi)

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intelcom>
---
 drivers/gpu/drm/i915/intel_vdsc.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
index 4b4b812d68f3..8b46619aae15 100644
--- a/drivers/gpu/drm/i915/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/intel_vdsc.c
@@ -1010,6 +1010,12 @@ static void intel_dp_send_dsc_pps_sdp(struct intel_encoder *encoder,
 void intel_dsc_enable(struct intel_encoder *encoder,
 		      struct intel_crtc_state *crtc_state)
 {
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	enum pipe pipe = crtc->pipe;
+	i915_reg_t dss_ctl1_reg, dss_ctl2_reg;
+	u32 dss_ctl1_val = 0;
+	u32 dss_ctl2_val = 0;
 
 	if (!crtc_state->dsc_params.compression_enable)
 		return;
@@ -1018,5 +1024,21 @@ void intel_dsc_enable(struct intel_encoder *encoder,
 
 	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
 
+	/* Configure DSS_CTL registers for DSC */
+	if (crtc_state->cpu_transcoder == TRANSCODER_EDP) {
+		dss_ctl1_reg = DSS_CTL1;
+		dss_ctl2_reg = DSS_CTL2;
+	} else {
+		dss_ctl1_reg = ICL_PIPE_DSS_CTL1(pipe);
+		dss_ctl2_reg = ICL_PIPE_DSS_CTL2(pipe);
+	}
+	dss_ctl2_val |= LEFT_BRANCH_VDSC_ENABLE;
+	if (crtc_state->dsc_params.dsc_split) {
+		dss_ctl2_val |= RIGHT_BRANCH_VDSC_ENABLE;
+		dss_ctl1_val |= JOINER_ENABLE;
+	}
+	I915_WRITE(dss_ctl1_reg, dss_ctl1_val);
+	I915_WRITE(dss_ctl2_reg, dss_ctl2_val);
+
 	return;
 }
-- 
2.18.0

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Re: [PATCH v6 24/28] drm/i915/dp: Configure Display stream splitter registers during DSC enable

[Ville Syrjälä]

On Wed, Oct 24, 2018 at 03:28:36PM -0700, Manasi Navare wrote:
> Display Stream Splitter registers need to be programmed to enable
> the joiner if two DSC engines are used and also to enable
> the left and the right DSC engines. This happens as part of
> the DSC enabling routine in the source in atomic commit.
> 
> v3:
> * Use cpu_transcoder instead of encoder->type (Ville)
> v2:
> * Rebase (Manasi)
> 
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intelcom>
> ---
>  drivers/gpu/drm/i915/intel_vdsc.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> index 4b4b812d68f3..8b46619aae15 100644
> --- a/drivers/gpu/drm/i915/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> @@ -1010,6 +1010,12 @@ static void intel_dp_send_dsc_pps_sdp(struct intel_encoder *encoder,
>  void intel_dsc_enable(struct intel_encoder *encoder,
>  		      struct intel_crtc_state *crtc_state)
>  {
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +	enum pipe pipe = crtc->pipe;
> +	i915_reg_t dss_ctl1_reg, dss_ctl2_reg;
> +	u32 dss_ctl1_val = 0;
> +	u32 dss_ctl2_val = 0;
>  
>  	if (!crtc_state->dsc_params.compression_enable)
>  		return;
> @@ -1018,5 +1024,21 @@ void intel_dsc_enable(struct intel_encoder *encoder,
>  
>  	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
>  
> +	/* Configure DSS_CTL registers for DSC */

This comment seems redundant.

> +	if (crtc_state->cpu_transcoder == TRANSCODER_EDP) {
> +		dss_ctl1_reg = DSS_CTL1;
> +		dss_ctl2_reg = DSS_CTL2;
> +	} else {
> +		dss_ctl1_reg = ICL_PIPE_DSS_CTL1(pipe);
> +		dss_ctl2_reg = ICL_PIPE_DSS_CTL2(pipe);

Shouldn't these be cpu_transcoder too? Yeah, it's the same thing
essentially, but I think it's better to use the thing that
actually matches the hardware.

I wonder if it would even make sense to do the trans==EDP check
in the macro as well. Would avoid cluttering the code with 
details like this. The macro wouldn't be the prettiest thing
ever, but that more or less holds for all reg macros.

> +	}
> +	dss_ctl2_val |= LEFT_BRANCH_VDSC_ENABLE;
> +	if (crtc_state->dsc_params.dsc_split) {
> +		dss_ctl2_val |= RIGHT_BRANCH_VDSC_ENABLE;
> +		dss_ctl1_val |= JOINER_ENABLE;
> +	}
> +	I915_WRITE(dss_ctl1_reg, dss_ctl1_val);
> +	I915_WRITE(dss_ctl2_reg, dss_ctl2_val);
> +
>  	return;
>  }
> -- 
> 2.18.0

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 24/28] drm/i915/dp: Configure Display stream splitter registers during DSC enable

[Manasi Navare]

On Thu, Oct 25, 2018 at 05:15:34PM +0300, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:36PM -0700, Manasi Navare wrote:
> > Display Stream Splitter registers need to be programmed to enable
> > the joiner if two DSC engines are used and also to enable
> > the left and the right DSC engines. This happens as part of
> > the DSC enabling routine in the source in atomic commit.
> > 
> > v3:
> > * Use cpu_transcoder instead of encoder->type (Ville)
> > v2:
> > * Rebase (Manasi)
> > 
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intelcom>
> > ---
> >  drivers/gpu/drm/i915/intel_vdsc.c | 22 ++++++++++++++++++++++
> >  1 file changed, 22 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> > index 4b4b812d68f3..8b46619aae15 100644
> > --- a/drivers/gpu/drm/i915/intel_vdsc.c
> > +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> > @@ -1010,6 +1010,12 @@ static void intel_dp_send_dsc_pps_sdp(struct intel_encoder *encoder,
> >  void intel_dsc_enable(struct intel_encoder *encoder,
> >  		      struct intel_crtc_state *crtc_state)
> >  {
> > +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
> > +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> > +	enum pipe pipe = crtc->pipe;
> > +	i915_reg_t dss_ctl1_reg, dss_ctl2_reg;
> > +	u32 dss_ctl1_val = 0;
> > +	u32 dss_ctl2_val = 0;
> >  
> >  	if (!crtc_state->dsc_params.compression_enable)
> >  		return;
> > @@ -1018,5 +1024,21 @@ void intel_dsc_enable(struct intel_encoder *encoder,
> >  
> >  	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
> >  
> > +	/* Configure DSS_CTL registers for DSC */
> 
> This comment seems redundant.

Yes, might have added this during the early development cycles. Will remove it now
that it follows the functions that actually do it.
Thanks for pointing it out.

> 
> > +	if (crtc_state->cpu_transcoder == TRANSCODER_EDP) {
> > +		dss_ctl1_reg = DSS_CTL1;
> > +		dss_ctl2_reg = DSS_CTL2;
> > +	} else {
> > +		dss_ctl1_reg = ICL_PIPE_DSS_CTL1(pipe);
> > +		dss_ctl2_reg = ICL_PIPE_DSS_CTL2(pipe);
> 
> Shouldn't these be cpu_transcoder too? Yeah, it's the same thing
> essentially, but I think it's better to use the thing that
> actually matches the hardware.

But if you look at the spec def of PIPE_DSS_CTL1 and 2, it actually
has a set of registers for Pipe B and different for Pipe C.
So in case of external DP VDSC engines are tied to per pipe
on ICL as well.

Only for eDP, it is tied to transcoder EDP and hence I look at the
transcoder eDP and use DSS_CTL1 or 2 else use PIPE_DSS_CTL1/2.

> 
> I wonder if it would even make sense to do the trans==EDP check
> in the macro as well. Would avoid cluttering the code with 
> details like this. The macro wouldn't be the prettiest thing
> ever, but that more or less holds for all reg macros.
>

So add a macro something like this:
#define IS_TRANSCODER_EDP(crtc-state)       crtc_state->cpu_transcoder == TRANSCODER_EDP;

Is this what you are suggesting?

MAnasi

> > +	}
> > +	dss_ctl2_val |= LEFT_BRANCH_VDSC_ENABLE;
> > +	if (crtc_state->dsc_params.dsc_split) {
> > +		dss_ctl2_val |= RIGHT_BRANCH_VDSC_ENABLE;
> > +		dss_ctl1_val |= JOINER_ENABLE;
> > +	}
> > +	I915_WRITE(dss_ctl1_reg, dss_ctl1_val);
> > +	I915_WRITE(dss_ctl2_reg, dss_ctl2_val);
> > +
> >  	return;
> >  }
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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[PATCH v6 25/28] drm/i915/dp: Disable DSC in source by disabling DSS CTL bits

[Manasi Navare]

1. Disable Left/right VDSC branch in DSS Ctrl reg
    depending on the number of VDSC engines being used
2. Disable joiner in DSS Ctrl reg

v3 (From Manasi):
* Add Disable PG2 for VDSC on eDP
v2 (From Manasi):
* Use old_crtc_state to find dsc params
* Add a condition to disable only if
dsc state compression is enabled
* Use correct DSS CTL regs

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h      |  2 ++
 drivers/gpu/drm/i915/intel_display.c | 13 +++++++++++
 drivers/gpu/drm/i915/intel_vdsc.c    | 33 ++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 16e6bb98eb1b..e31f19a688bc 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3489,6 +3489,8 @@ extern bool intel_set_memory_cxsr(struct drm_i915_private *dev_priv,
 				  bool enable);
 extern void intel_dsc_enable(struct intel_encoder *encoder,
 			     struct intel_crtc_state *crtc_state);
+extern void intel_dsc_disable(struct intel_encoder *encoder,
+			      struct intel_crtc_state *crtc_state);
 
 int i915_reg_read_ioctl(struct drm_device *dev, void *data,
 			struct drm_file *file);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 023a9baef101..3d9d70d3314e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5853,6 +5853,9 @@ static void haswell_crtc_disable(struct intel_crtc_state *old_crtc_state,
 	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
+	struct drm_connector_state *conn_state;
+	struct drm_connector *conn;
+	int i;
 
 	intel_encoders_disable(crtc, old_crtc_state, old_state);
 
@@ -5869,6 +5872,16 @@ static void haswell_crtc_disable(struct intel_crtc_state *old_crtc_state,
 	if (!transcoder_is_dsi(cpu_transcoder))
 		intel_ddi_disable_transcoder_func(old_crtc_state);
 
+	for_each_new_connector_in_state(old_state, conn, conn_state, i) {
+		struct intel_encoder *encoder =
+			to_intel_encoder(conn_state->best_encoder);
+
+		if (conn_state->crtc != crtc)
+			continue;
+
+		intel_dsc_disable(encoder, old_crtc_state);
+	}
+
 	if (INTEL_GEN(dev_priv) >= 9)
 		skylake_scaler_disable(intel_crtc);
 	else
diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
index 8b46619aae15..5e76b4a44d90 100644
--- a/drivers/gpu/drm/i915/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/intel_vdsc.c
@@ -1042,3 +1042,36 @@ void intel_dsc_enable(struct intel_encoder *encoder,
 
 	return;
 }
+
+void intel_dsc_disable(struct intel_encoder *encoder,
+		       struct intel_crtc_state *old_crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	enum pipe pipe = crtc->pipe;
+	i915_reg_t dss_ctl1_reg, dss_ctl2_reg;
+	u32 dss_ctl1_val = 0, dss_ctl2_val = 0;
+
+	if (!old_crtc_state->dsc_params.compression_enable)
+		return;
+
+	if (encoder->type == INTEL_OUTPUT_EDP) {
+		dss_ctl1_reg = DSS_CTL1;
+		dss_ctl2_reg = DSS_CTL2;
+	} else {
+		dss_ctl1_reg = ICL_PIPE_DSS_CTL1(pipe);
+		dss_ctl2_reg = ICL_PIPE_DSS_CTL2(pipe);
+	}
+	dss_ctl1_val = I915_READ(dss_ctl1_reg);
+	if (dss_ctl1_val & JOINER_ENABLE)
+		dss_ctl1_val &= ~JOINER_ENABLE;
+	I915_WRITE(dss_ctl1_reg, dss_ctl1_val);
+
+	dss_ctl2_val = I915_READ(dss_ctl2_reg);
+	if (dss_ctl2_val & LEFT_BRANCH_VDSC_ENABLE ||
+	    dss_ctl2_val & RIGHT_BRANCH_VDSC_ENABLE)
+		dss_ctl2_val &= ~(LEFT_BRANCH_VDSC_ENABLE |
+				  RIGHT_BRANCH_VDSC_ENABLE);
+	I915_WRITE(dss_ctl2_reg, dss_ctl2_val);
+
+}
-- 
2.18.0

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Re: [PATCH v6 25/28] drm/i915/dp: Disable DSC in source by disabling DSS CTL bits

[Ville Syrjälä]

On Wed, Oct 24, 2018 at 03:28:37PM -0700, Manasi Navare wrote:
> 1. Disable Left/right VDSC branch in DSS Ctrl reg
>     depending on the number of VDSC engines being used
> 2. Disable joiner in DSS Ctrl reg
> 
> v3 (From Manasi):
> * Add Disable PG2 for VDSC on eDP
> v2 (From Manasi):
> * Use old_crtc_state to find dsc params
> * Add a condition to disable only if
> dsc state compression is enabled
> * Use correct DSS CTL regs
> 
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
> Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.h      |  2 ++
>  drivers/gpu/drm/i915/intel_display.c | 13 +++++++++++
>  drivers/gpu/drm/i915/intel_vdsc.c    | 33 ++++++++++++++++++++++++++++
>  3 files changed, 48 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 16e6bb98eb1b..e31f19a688bc 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -3489,6 +3489,8 @@ extern bool intel_set_memory_cxsr(struct drm_i915_private *dev_priv,
>  				  bool enable);
>  extern void intel_dsc_enable(struct intel_encoder *encoder,
>  			     struct intel_crtc_state *crtc_state);
> +extern void intel_dsc_disable(struct intel_encoder *encoder,
> +			      struct intel_crtc_state *crtc_state);
>  
>  int i915_reg_read_ioctl(struct drm_device *dev, void *data,
>  			struct drm_file *file);
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 023a9baef101..3d9d70d3314e 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5853,6 +5853,9 @@ static void haswell_crtc_disable(struct intel_crtc_state *old_crtc_state,
>  	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
>  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
>  	enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
> +	struct drm_connector_state *conn_state;
> +	struct drm_connector *conn;
> +	int i;
>  
>  	intel_encoders_disable(crtc, old_crtc_state, old_state);
>  
> @@ -5869,6 +5872,16 @@ static void haswell_crtc_disable(struct intel_crtc_state *old_crtc_state,
>  	if (!transcoder_is_dsi(cpu_transcoder))
>  		intel_ddi_disable_transcoder_func(old_crtc_state);
>  
> +	for_each_new_connector_in_state(old_state, conn, conn_state, i) {
> +		struct intel_encoder *encoder =
> +			to_intel_encoder(conn_state->best_encoder);
> +
> +		if (conn_state->crtc != crtc)
> +			continue;
> +
> +		intel_dsc_disable(encoder, old_crtc_state);
> +	}

Can't we do this from the encodr hooks? /me didn't check the modeset
sequence docs...

> +
>  	if (INTEL_GEN(dev_priv) >= 9)
>  		skylake_scaler_disable(intel_crtc);
>  	else
> diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> index 8b46619aae15..5e76b4a44d90 100644
> --- a/drivers/gpu/drm/i915/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> @@ -1042,3 +1042,36 @@ void intel_dsc_enable(struct intel_encoder *encoder,
>  
>  	return;
>  }
> +
> +void intel_dsc_disable(struct intel_encoder *encoder,
> +		       struct intel_crtc_state *old_crtc_state)
> +{
> +	struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +	enum pipe pipe = crtc->pipe;
> +	i915_reg_t dss_ctl1_reg, dss_ctl2_reg;
> +	u32 dss_ctl1_val = 0, dss_ctl2_val = 0;
> +
> +	if (!old_crtc_state->dsc_params.compression_enable)
> +		return;
> +
> +	if (encoder->type == INTEL_OUTPUT_EDP) {
> +		dss_ctl1_reg = DSS_CTL1;
> +		dss_ctl2_reg = DSS_CTL2;
> +	} else {
> +		dss_ctl1_reg = ICL_PIPE_DSS_CTL1(pipe);
> +		dss_ctl2_reg = ICL_PIPE_DSS_CTL2(pipe);
> +	}
> +	dss_ctl1_val = I915_READ(dss_ctl1_reg);
> +	if (dss_ctl1_val & JOINER_ENABLE)
> +		dss_ctl1_val &= ~JOINER_ENABLE;
> +	I915_WRITE(dss_ctl1_reg, dss_ctl1_val);
> +
> +	dss_ctl2_val = I915_READ(dss_ctl2_reg);
> +	if (dss_ctl2_val & LEFT_BRANCH_VDSC_ENABLE ||
> +	    dss_ctl2_val & RIGHT_BRANCH_VDSC_ENABLE)
> +		dss_ctl2_val &= ~(LEFT_BRANCH_VDSC_ENABLE |
> +				  RIGHT_BRANCH_VDSC_ENABLE);
> +	I915_WRITE(dss_ctl2_reg, dss_ctl2_val);
> +
> +}
> -- 
> 2.18.0

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 25/28] drm/i915/dp: Disable DSC in source by disabling DSS CTL bits

[Manasi Navare]

On Thu, Oct 25, 2018 at 05:16:58PM +0300, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:37PM -0700, Manasi Navare wrote:
> > 1. Disable Left/right VDSC branch in DSS Ctrl reg
> >     depending on the number of VDSC engines being used
> > 2. Disable joiner in DSS Ctrl reg
> > 
> > v3 (From Manasi):
> > * Add Disable PG2 for VDSC on eDP
> > v2 (From Manasi):
> > * Use old_crtc_state to find dsc params
> > * Add a condition to disable only if
> > dsc state compression is enabled
> > * Use correct DSS CTL regs
> > 
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_drv.h      |  2 ++
> >  drivers/gpu/drm/i915/intel_display.c | 13 +++++++++++
> >  drivers/gpu/drm/i915/intel_vdsc.c    | 33 ++++++++++++++++++++++++++++
> >  3 files changed, 48 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index 16e6bb98eb1b..e31f19a688bc 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -3489,6 +3489,8 @@ extern bool intel_set_memory_cxsr(struct drm_i915_private *dev_priv,
> >  				  bool enable);
> >  extern void intel_dsc_enable(struct intel_encoder *encoder,
> >  			     struct intel_crtc_state *crtc_state);
> > +extern void intel_dsc_disable(struct intel_encoder *encoder,
> > +			      struct intel_crtc_state *crtc_state);
> >  
> >  int i915_reg_read_ioctl(struct drm_device *dev, void *data,
> >  			struct drm_file *file);
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 023a9baef101..3d9d70d3314e 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -5853,6 +5853,9 @@ static void haswell_crtc_disable(struct intel_crtc_state *old_crtc_state,
> >  	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
> >  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> >  	enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
> > +	struct drm_connector_state *conn_state;
> > +	struct drm_connector *conn;
> > +	int i;
> >  
> >  	intel_encoders_disable(crtc, old_crtc_state, old_state);
> >  
> > @@ -5869,6 +5872,16 @@ static void haswell_crtc_disable(struct intel_crtc_state *old_crtc_state,
> >  	if (!transcoder_is_dsi(cpu_transcoder))
> >  		intel_ddi_disable_transcoder_func(old_crtc_state);
> >  
> > +	for_each_new_connector_in_state(old_state, conn, conn_state, i) {
> > +		struct intel_encoder *encoder =
> > +			to_intel_encoder(conn_state->best_encoder);
> > +
> > +		if (conn_state->crtc != crtc)
> > +			continue;
> > +
> > +		intel_dsc_disable(encoder, old_crtc_state);
> > +	}
> 
> Can't we do this from the encodr hooks? /me didn't check the modeset
> sequence docs...

Hmm yes it could be made part of intel_encoders_post_disable(). The spec is not
clear in terms of where in the sequence shd this be disabled.

Do you think intel_encoders_post_disable() is the right place?

Manasi

> 
> > +
> >  	if (INTEL_GEN(dev_priv) >= 9)
> >  		skylake_scaler_disable(intel_crtc);
> >  	else
> > diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> > index 8b46619aae15..5e76b4a44d90 100644
> > --- a/drivers/gpu/drm/i915/intel_vdsc.c
> > +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> > @@ -1042,3 +1042,36 @@ void intel_dsc_enable(struct intel_encoder *encoder,
> >  
> >  	return;
> >  }
> > +
> > +void intel_dsc_disable(struct intel_encoder *encoder,
> > +		       struct intel_crtc_state *old_crtc_state)
> > +{
> > +	struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
> > +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> > +	enum pipe pipe = crtc->pipe;
> > +	i915_reg_t dss_ctl1_reg, dss_ctl2_reg;
> > +	u32 dss_ctl1_val = 0, dss_ctl2_val = 0;
> > +
> > +	if (!old_crtc_state->dsc_params.compression_enable)
> > +		return;
> > +
> > +	if (encoder->type == INTEL_OUTPUT_EDP) {
> > +		dss_ctl1_reg = DSS_CTL1;
> > +		dss_ctl2_reg = DSS_CTL2;
> > +	} else {
> > +		dss_ctl1_reg = ICL_PIPE_DSS_CTL1(pipe);
> > +		dss_ctl2_reg = ICL_PIPE_DSS_CTL2(pipe);
> > +	}
> > +	dss_ctl1_val = I915_READ(dss_ctl1_reg);
> > +	if (dss_ctl1_val & JOINER_ENABLE)
> > +		dss_ctl1_val &= ~JOINER_ENABLE;
> > +	I915_WRITE(dss_ctl1_reg, dss_ctl1_val);
> > +
> > +	dss_ctl2_val = I915_READ(dss_ctl2_reg);
> > +	if (dss_ctl2_val & LEFT_BRANCH_VDSC_ENABLE ||
> > +	    dss_ctl2_val & RIGHT_BRANCH_VDSC_ENABLE)
> > +		dss_ctl2_val &= ~(LEFT_BRANCH_VDSC_ENABLE |
> > +				  RIGHT_BRANCH_VDSC_ENABLE);
> > +	I915_WRITE(dss_ctl2_reg, dss_ctl2_val);
> > +
> > +}
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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[PATCH v6 26/28] drm/i915/dsc: Enable and disable appropriate power wells for VDSC

[Manasi Navare]

A separate power well 2 (PG2) is required for VDSC on eDP transcoder
whereas all other transcoders use the power wells associated with the
transcoders for VDSC.
This patch adds a helper to obtain correct power domain depending on
transcoder being used and enables/disables the power wells during
VDSC enabling/disabling.

v2:
* Fix tabs, const crtc_state, fix comments (Ville)

Suggested-by: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_vdsc.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
index 5e76b4a44d90..0fed36e2491a 100644
--- a/drivers/gpu/drm/i915/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/intel_vdsc.c
@@ -581,6 +581,24 @@ int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
 	return 0;
 }
 
+static enum intel_display_power_domain
+intel_dsc_get_power_domains(const struct intel_crtc_state *crtc_state)
+{
+	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+
+	/*
+	 * On ICL VDSC/joining for eDP transcoder uses a separate power well PW2
+	 * This requires POWER_DOMAIN_TRANSCODER_EDP_VDSC power domain.
+	 * For any other transcoder, VDSC/joining uses the power well associated
+	 * with the pipe/transcoder in use. Hence another reference on the
+	 * transcoder power domain will suffice.
+	 */
+	if (cpu_transcoder == TRANSCODER_EDP)
+		return POWER_DOMAIN_TRANSCODER_EDP_VDSC;
+	else
+		return POWER_DOMAIN_TRANSCODER(cpu_transcoder);
+}
+
 static void intel_configure_pps_for_dsc_encoder(struct intel_encoder *encoder,
 						struct intel_crtc_state *crtc_state)
 {
@@ -1020,6 +1038,10 @@ void intel_dsc_enable(struct intel_encoder *encoder,
 	if (!crtc_state->dsc_params.compression_enable)
 		return;
 
+	/* Enable Power wells for VDSC/joining */
+	intel_display_power_get(dev_priv,
+				intel_dsc_get_power_domains(crtc_state));
+
 	intel_configure_pps_for_dsc_encoder(encoder, crtc_state);
 
 	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
@@ -1074,4 +1096,8 @@ void intel_dsc_disable(struct intel_encoder *encoder,
 				  RIGHT_BRANCH_VDSC_ENABLE);
 	I915_WRITE(dss_ctl2_reg, dss_ctl2_val);
 
+	/* Disable Power wells for VDSC/joining */
+	intel_display_power_put(dev_priv,
+				intel_dsc_get_power_domains(old_crtc_state));
+
 }
-- 
2.18.0

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Re: [PATCH v6 26/28] drm/i915/dsc: Enable and disable appropriate power wells for VDSC

[Ville Syrjälä]

On Wed, Oct 24, 2018 at 03:28:38PM -0700, Manasi Navare wrote:
> A separate power well 2 (PG2) is required for VDSC on eDP transcoder
> whereas all other transcoders use the power wells associated with the
> transcoders for VDSC.
> This patch adds a helper to obtain correct power domain depending on
> transcoder being used and enables/disables the power wells during
> VDSC enabling/disabling.
> 
> v2:
> * Fix tabs, const crtc_state, fix comments (Ville)
> 
> Suggested-by: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Imre Deak <imre.deak@intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_vdsc.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> index 5e76b4a44d90..0fed36e2491a 100644
> --- a/drivers/gpu/drm/i915/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> @@ -581,6 +581,24 @@ int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
>  	return 0;
>  }
>  
> +static enum intel_display_power_domain
> +intel_dsc_get_power_domains(const struct intel_crtc_state *crtc_state)

intel_dsc_power_domain() or something like that to match
the naming convention introduced by intel_ddi_main_link_aux_domain()?

Oh, and we'll need to update intel_ddi_get_power_domains() as well.

> +{
> +	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
> +
> +	/*
> +	 * On ICL VDSC/joining for eDP transcoder uses a separate power well PW2
> +	 * This requires POWER_DOMAIN_TRANSCODER_EDP_VDSC power domain.
> +	 * For any other transcoder, VDSC/joining uses the power well associated
> +	 * with the pipe/transcoder in use. Hence another reference on the
> +	 * transcoder power domain will suffice.
> +	 */
> +	if (cpu_transcoder == TRANSCODER_EDP)
> +		return POWER_DOMAIN_TRANSCODER_EDP_VDSC;
> +	else
> +		return POWER_DOMAIN_TRANSCODER(cpu_transcoder);
> +}
> +
>  static void intel_configure_pps_for_dsc_encoder(struct intel_encoder *encoder,
>  						struct intel_crtc_state *crtc_state)
>  {
> @@ -1020,6 +1038,10 @@ void intel_dsc_enable(struct intel_encoder *encoder,
>  	if (!crtc_state->dsc_params.compression_enable)
>  		return;
>  
> +	/* Enable Power wells for VDSC/joining */
> +	intel_display_power_get(dev_priv,
> +				intel_dsc_get_power_domains(crtc_state));
> +
>  	intel_configure_pps_for_dsc_encoder(encoder, crtc_state);
>  
>  	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
> @@ -1074,4 +1096,8 @@ void intel_dsc_disable(struct intel_encoder *encoder,
>  				  RIGHT_BRANCH_VDSC_ENABLE);
>  	I915_WRITE(dss_ctl2_reg, dss_ctl2_val);
>  
> +	/* Disable Power wells for VDSC/joining */
> +	intel_display_power_put(dev_priv,
> +				intel_dsc_get_power_domains(old_crtc_state));
> +

Bogus newline here.

>  }
> -- 
> 2.18.0

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 26/28] drm/i915/dsc: Enable and disable appropriate power wells for VDSC

[Manasi Navare]

On Thu, Oct 25, 2018 at 05:22:18PM +0300, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:38PM -0700, Manasi Navare wrote:
> > A separate power well 2 (PG2) is required for VDSC on eDP transcoder
> > whereas all other transcoders use the power wells associated with the
> > transcoders for VDSC.
> > This patch adds a helper to obtain correct power domain depending on
> > transcoder being used and enables/disables the power wells during
> > VDSC enabling/disabling.
> > 
> > v2:
> > * Fix tabs, const crtc_state, fix comments (Ville)
> > 
> > Suggested-by: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Imre Deak <imre.deak@intel.com>
> > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_vdsc.c | 26 ++++++++++++++++++++++++++
> >  1 file changed, 26 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> > index 5e76b4a44d90..0fed36e2491a 100644
> > --- a/drivers/gpu/drm/i915/intel_vdsc.c
> > +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> > @@ -581,6 +581,24 @@ int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
> >  	return 0;
> >  }
> >  
> > +static enum intel_display_power_domain
> > +intel_dsc_get_power_domains(const struct intel_crtc_state *crtc_state)
> 
> intel_dsc_power_domain() or something like that to match
> the naming convention introduced by intel_ddi_main_link_aux_domain()?

Ok i can rename to use intel_dsc_power_domain() but it should still live
in intel_vdsc.c right?

> 
> Oh, and we'll need to update intel_ddi_get_power_domains() as well.

We would need to add this power domain here so that its obtained during
the intel_modeset_setup_hw_state()..?

Manasi

> 
> > +{
> > +	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
> > +
> > +	/*
> > +	 * On ICL VDSC/joining for eDP transcoder uses a separate power well PW2
> > +	 * This requires POWER_DOMAIN_TRANSCODER_EDP_VDSC power domain.
> > +	 * For any other transcoder, VDSC/joining uses the power well associated
> > +	 * with the pipe/transcoder in use. Hence another reference on the
> > +	 * transcoder power domain will suffice.
> > +	 */
> > +	if (cpu_transcoder == TRANSCODER_EDP)
> > +		return POWER_DOMAIN_TRANSCODER_EDP_VDSC;
> > +	else
> > +		return POWER_DOMAIN_TRANSCODER(cpu_transcoder);
> > +}
> > +
> >  static void intel_configure_pps_for_dsc_encoder(struct intel_encoder *encoder,
> >  						struct intel_crtc_state *crtc_state)
> >  {
> > @@ -1020,6 +1038,10 @@ void intel_dsc_enable(struct intel_encoder *encoder,
> >  	if (!crtc_state->dsc_params.compression_enable)
> >  		return;
> >  
> > +	/* Enable Power wells for VDSC/joining */
> > +	intel_display_power_get(dev_priv,
> > +				intel_dsc_get_power_domains(crtc_state));
> > +
> >  	intel_configure_pps_for_dsc_encoder(encoder, crtc_state);
> >  
> >  	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
> > @@ -1074,4 +1096,8 @@ void intel_dsc_disable(struct intel_encoder *encoder,
> >  				  RIGHT_BRANCH_VDSC_ENABLE);
> >  	I915_WRITE(dss_ctl2_reg, dss_ctl2_val);
> >  
> > +	/* Disable Power wells for VDSC/joining */
> > +	intel_display_power_put(dev_priv,
> > +				intel_dsc_get_power_domains(old_crtc_state));
> > +
> 
> Bogus newline here.
> 
> >  }
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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[PATCH v6 27/28] drm/i915/dsc: Add Per connector debugfs node for DSC support/enable

[Manasi Navare]

DSC can be supported per DP connector. This patch adds a per connector
debugfs node to expose DSC support capability by the kernel.
The same node can be used from userspace to force DSC enable.

v2:
* Use kstrtobool_from_user to avoid explicit error checking (Lyude)
* Rebase on drm-tip (Manasi)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Lyude Paul <lyude@redhat.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 71 ++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/intel_dp.c     |  1 +
 drivers/gpu/drm/i915/intel_drv.h    |  3 ++
 3 files changed, 74 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 5cadfcd03ea9..6e631f08dd4b 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4999,6 +4999,72 @@ static int i915_hdcp_sink_capability_show(struct seq_file *m, void *data)
 }
 DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
 
+static int i915_dsc_support_show(struct seq_file *m, void *data)
+{
+	struct drm_connector *connector = m->private;
+	struct intel_encoder *encoder = intel_attached_encoder(connector);
+	struct intel_dp *intel_dp =
+		enc_to_intel_dp(&encoder->base);
+	struct intel_crtc *crtc;
+	struct intel_crtc_state *crtc_state;
+
+	crtc = to_intel_crtc(encoder->base.crtc);
+	crtc_state = to_intel_crtc_state(crtc->base.state);
+	drm_modeset_lock(&crtc->base.mutex, NULL);
+	seq_printf(m, "Enabled: %s\n",
+		   yesno(crtc_state->dsc_params.compression_enable));
+	seq_printf(m, "Supported: %s\n",
+		   yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
+	drm_modeset_unlock(&crtc->base.mutex);
+
+	return 0;
+}
+
+static ssize_t i915_dsc_support_write(struct file *file,
+				      const char __user *ubuf,
+				      size_t len, loff_t *offp)
+{
+	bool dsc_enable = false;
+	int ret;
+	struct drm_connector *connector =
+		((struct seq_file *)file->private_data)->private;
+	struct intel_encoder *encoder = intel_attached_encoder(connector);
+	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+
+	if (len == 0)
+		return 0;
+
+	DRM_DEBUG_DRIVER("Copied %d bytes from user to force DSC\n",
+			 (unsigned int)len);
+
+	ret = kstrtobool_from_user(ubuf, len, &dsc_enable);
+	if (ret < 0)
+		return ret;
+
+	DRM_DEBUG_DRIVER("Got %s for DSC Enable\n",
+			 (dsc_enable) ? "true" : "false");
+	intel_dp->force_dsc_en = dsc_enable;
+
+	*offp += len;
+	return len;
+}
+
+static int i915_dsc_support_open(struct inode *inode,
+				 struct file *file)
+{
+	return single_open(file, i915_dsc_support_show,
+			   inode->i_private);
+}
+
+static const struct file_operations i915_dsc_support_fops = {
+	.owner = THIS_MODULE,
+	.open = i915_dsc_support_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.write = i915_dsc_support_write
+};
+
 /**
  * i915_debugfs_connector_add - add i915 specific connector debugfs files
  * @connector: pointer to a registered drm_connector
@@ -5017,9 +5083,12 @@ int i915_debugfs_connector_add(struct drm_connector *connector)
 		return -ENODEV;
 
 	if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
-	    connector->connector_type == DRM_MODE_CONNECTOR_eDP)
+	    connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 		debugfs_create_file("i915_dpcd", S_IRUGO, root,
 				    connector, &i915_dpcd_fops);
+		debugfs_create_file("i915_dsc_support", S_IRUGO, root,
+				    connector, &i915_dsc_support_fops);
+	}
 
 	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 		debugfs_create_file("i915_panel_timings", S_IRUGO, root,
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 72e6605f0ed7..0b5939992c2b 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2287,6 +2287,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
 		return false;
 
+	DRM_DEBUG_KMS("Force DSC en = %d\n", intel_dp->force_dsc_en);
 	if (!intel_dp_compute_link_config(encoder, pipe_config))
 		return false;
 
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 4f5d17bcd54e..16bbc3768e02 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1196,6 +1196,9 @@ struct intel_dp {
 
 	/* Displayport compliance testing */
 	struct intel_dp_compliance compliance;
+
+	/* Display stream compression testing */
+	bool force_dsc_en;
 };
 
 enum lspcon_vendor {
-- 
2.18.0

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Re: [PATCH v6 27/28] drm/i915/dsc: Add Per connector debugfs node for DSC support/enable

[Lyude Paul]

On Wed, 2018-10-24 at 15:28 -0700, Manasi Navare wrote:
> DSC can be supported per DP connector. This patch adds a per connector
> debugfs node to expose DSC support capability by the kernel.
> The same node can be used from userspace to force DSC enable.
> 
> v2:
> * Use kstrtobool_from_user to avoid explicit error checking (Lyude)
> * Rebase on drm-tip (Manasi)
> 
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Cc: Lyude Paul <lyude@redhat.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Lyude Paul <lyude@redhat.com>

(just making a note to anyone passing by this: my R-B here is still valid!)
(also thanks for the patch :)
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 71 ++++++++++++++++++++++++++++-
>  drivers/gpu/drm/i915/intel_dp.c     |  1 +
>  drivers/gpu/drm/i915/intel_drv.h    |  3 ++
>  3 files changed, 74 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> b/drivers/gpu/drm/i915/i915_debugfs.c
> index 5cadfcd03ea9..6e631f08dd4b 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -4999,6 +4999,72 @@ static int i915_hdcp_sink_capability_show(struct
> seq_file *m, void *data)
>  }
>  DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
>  
> +static int i915_dsc_support_show(struct seq_file *m, void *data)
> +{
> +	struct drm_connector *connector = m->private;
> +	struct intel_encoder *encoder = intel_attached_encoder(connector);
> +	struct intel_dp *intel_dp =
> +		enc_to_intel_dp(&encoder->base);
> +	struct intel_crtc *crtc;
> +	struct intel_crtc_state *crtc_state;
> +
> +	crtc = to_intel_crtc(encoder->base.crtc);
> +	crtc_state = to_intel_crtc_state(crtc->base.state);
> +	drm_modeset_lock(&crtc->base.mutex, NULL);
> +	seq_printf(m, "Enabled: %s\n",
> +		   yesno(crtc_state->dsc_params.compression_enable));
> +	seq_printf(m, "Supported: %s\n",
> +		   yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
> +	drm_modeset_unlock(&crtc->base.mutex);
> +
> +	return 0;
> +}
> +
> +static ssize_t i915_dsc_support_write(struct file *file,
> +				      const char __user *ubuf,
> +				      size_t len, loff_t *offp)
> +{
> +	bool dsc_enable = false;
> +	int ret;
> +	struct drm_connector *connector =
> +		((struct seq_file *)file->private_data)->private;
> +	struct intel_encoder *encoder = intel_attached_encoder(connector);
> +	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> +
> +	if (len == 0)
> +		return 0;
> +
> +	DRM_DEBUG_DRIVER("Copied %d bytes from user to force DSC\n",
> +			 (unsigned int)len);
> +
> +	ret = kstrtobool_from_user(ubuf, len, &dsc_enable);
> +	if (ret < 0)
> +		return ret;
> +
> +	DRM_DEBUG_DRIVER("Got %s for DSC Enable\n",
> +			 (dsc_enable) ? "true" : "false");
> +	intel_dp->force_dsc_en = dsc_enable;
> +
> +	*offp += len;
> +	return len;
> +}
> +
> +static int i915_dsc_support_open(struct inode *inode,
> +				 struct file *file)
> +{
> +	return single_open(file, i915_dsc_support_show,
> +			   inode->i_private);
> +}
> +
> +static const struct file_operations i915_dsc_support_fops = {
> +	.owner = THIS_MODULE,
> +	.open = i915_dsc_support_open,
> +	.read = seq_read,
> +	.llseek = seq_lseek,
> +	.release = single_release,
> +	.write = i915_dsc_support_write
> +};
> +
>  /**
>   * i915_debugfs_connector_add - add i915 specific connector debugfs files
>   * @connector: pointer to a registered drm_connector
> @@ -5017,9 +5083,12 @@ int i915_debugfs_connector_add(struct drm_connector
> *connector)
>  		return -ENODEV;
>  
>  	if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
> -	    connector->connector_type == DRM_MODE_CONNECTOR_eDP)
> +	    connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
>  		debugfs_create_file("i915_dpcd", S_IRUGO, root,
>  				    connector, &i915_dpcd_fops);
> +		debugfs_create_file("i915_dsc_support", S_IRUGO, root,
> +				    connector, &i915_dsc_support_fops);
> +	}
>  
>  	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
>  		debugfs_create_file("i915_panel_timings", S_IRUGO, root,
> diff --git a/drivers/gpu/drm/i915/intel_dp.c
> b/drivers/gpu/drm/i915/intel_dp.c
> index 72e6605f0ed7..0b5939992c2b 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -2287,6 +2287,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>  	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
>  		return false;
>  
> +	DRM_DEBUG_KMS("Force DSC en = %d\n", intel_dp->force_dsc_en);
>  	if (!intel_dp_compute_link_config(encoder, pipe_config))
>  		return false;
>  
> diff --git a/drivers/gpu/drm/i915/intel_drv.h
> b/drivers/gpu/drm/i915/intel_drv.h
> index 4f5d17bcd54e..16bbc3768e02 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1196,6 +1196,9 @@ struct intel_dp {
>  
>  	/* Displayport compliance testing */
>  	struct intel_dp_compliance compliance;
> +
> +	/* Display stream compression testing */
> +	bool force_dsc_en;
>  };
>  
>  enum lspcon_vendor {
-- 
Cheers,
	Lyude Paul

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Re: [PATCH v6 27/28] drm/i915/dsc: Add Per connector debugfs node for DSC support/enable

[Manasi Navare]

On Wed, Oct 24, 2018 at 06:28:02PM -0400, Lyude Paul wrote:
> On Wed, 2018-10-24 at 15:28 -0700, Manasi Navare wrote:
> > DSC can be supported per DP connector. This patch adds a per connector
> > debugfs node to expose DSC support capability by the kernel.
> > The same node can be used from userspace to force DSC enable.
> > 
> > v2:
> > * Use kstrtobool_from_user to avoid explicit error checking (Lyude)
> > * Rebase on drm-tip (Manasi)
> > 
> > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Cc: Lyude Paul <lyude@redhat.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Lyude Paul <lyude@redhat.com>
> 
> (just making a note to anyone passing by this: my R-B here is still valid!)
> (also thanks for the patch :)

Thanks Lyude for thsi note and the initial review feedback! Appreciate your time and inputs.

Manasi

> > ---
> >  drivers/gpu/drm/i915/i915_debugfs.c | 71 ++++++++++++++++++++++++++++-
> >  drivers/gpu/drm/i915/intel_dp.c     |  1 +
> >  drivers/gpu/drm/i915/intel_drv.h    |  3 ++
> >  3 files changed, 74 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> > b/drivers/gpu/drm/i915/i915_debugfs.c
> > index 5cadfcd03ea9..6e631f08dd4b 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -4999,6 +4999,72 @@ static int i915_hdcp_sink_capability_show(struct
> > seq_file *m, void *data)
> >  }
> >  DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
> >  
> > +static int i915_dsc_support_show(struct seq_file *m, void *data)
> > +{
> > +	struct drm_connector *connector = m->private;
> > +	struct intel_encoder *encoder = intel_attached_encoder(connector);
> > +	struct intel_dp *intel_dp =
> > +		enc_to_intel_dp(&encoder->base);
> > +	struct intel_crtc *crtc;
> > +	struct intel_crtc_state *crtc_state;
> > +
> > +	crtc = to_intel_crtc(encoder->base.crtc);
> > +	crtc_state = to_intel_crtc_state(crtc->base.state);
> > +	drm_modeset_lock(&crtc->base.mutex, NULL);
> > +	seq_printf(m, "Enabled: %s\n",
> > +		   yesno(crtc_state->dsc_params.compression_enable));
> > +	seq_printf(m, "Supported: %s\n",
> > +		   yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
> > +	drm_modeset_unlock(&crtc->base.mutex);
> > +
> > +	return 0;
> > +}
> > +
> > +static ssize_t i915_dsc_support_write(struct file *file,
> > +				      const char __user *ubuf,
> > +				      size_t len, loff_t *offp)
> > +{
> > +	bool dsc_enable = false;
> > +	int ret;
> > +	struct drm_connector *connector =
> > +		((struct seq_file *)file->private_data)->private;
> > +	struct intel_encoder *encoder = intel_attached_encoder(connector);
> > +	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> > +
> > +	if (len == 0)
> > +		return 0;
> > +
> > +	DRM_DEBUG_DRIVER("Copied %d bytes from user to force DSC\n",
> > +			 (unsigned int)len);
> > +
> > +	ret = kstrtobool_from_user(ubuf, len, &dsc_enable);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	DRM_DEBUG_DRIVER("Got %s for DSC Enable\n",
> > +			 (dsc_enable) ? "true" : "false");
> > +	intel_dp->force_dsc_en = dsc_enable;
> > +
> > +	*offp += len;
> > +	return len;
> > +}
> > +
> > +static int i915_dsc_support_open(struct inode *inode,
> > +				 struct file *file)
> > +{
> > +	return single_open(file, i915_dsc_support_show,
> > +			   inode->i_private);
> > +}
> > +
> > +static const struct file_operations i915_dsc_support_fops = {
> > +	.owner = THIS_MODULE,
> > +	.open = i915_dsc_support_open,
> > +	.read = seq_read,
> > +	.llseek = seq_lseek,
> > +	.release = single_release,
> > +	.write = i915_dsc_support_write
> > +};
> > +
> >  /**
> >   * i915_debugfs_connector_add - add i915 specific connector debugfs files
> >   * @connector: pointer to a registered drm_connector
> > @@ -5017,9 +5083,12 @@ int i915_debugfs_connector_add(struct drm_connector
> > *connector)
> >  		return -ENODEV;
> >  
> >  	if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
> > -	    connector->connector_type == DRM_MODE_CONNECTOR_eDP)
> > +	    connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
> >  		debugfs_create_file("i915_dpcd", S_IRUGO, root,
> >  				    connector, &i915_dpcd_fops);
> > +		debugfs_create_file("i915_dsc_support", S_IRUGO, root,
> > +				    connector, &i915_dsc_support_fops);
> > +	}
> >  
> >  	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
> >  		debugfs_create_file("i915_panel_timings", S_IRUGO, root,
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c
> > b/drivers/gpu/drm/i915/intel_dp.c
> > index 72e6605f0ed7..0b5939992c2b 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -2287,6 +2287,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> >  	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
> >  		return false;
> >  
> > +	DRM_DEBUG_KMS("Force DSC en = %d\n", intel_dp->force_dsc_en);
> >  	if (!intel_dp_compute_link_config(encoder, pipe_config))
> >  		return false;
> >  
> > diff --git a/drivers/gpu/drm/i915/intel_drv.h
> > b/drivers/gpu/drm/i915/intel_drv.h
> > index 4f5d17bcd54e..16bbc3768e02 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -1196,6 +1196,9 @@ struct intel_dp {
> >  
> >  	/* Displayport compliance testing */
> >  	struct intel_dp_compliance compliance;
> > +
> > +	/* Display stream compression testing */
> > +	bool force_dsc_en;
> >  };
> >  
> >  enum lspcon_vendor {
> -- 
> Cheers,
> 	Lyude Paul
> 
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Re: [PATCH v6 27/28] drm/i915/dsc: Add Per connector debugfs node for DSC support/enable

[Ville Syrjälä]

On Wed, Oct 24, 2018 at 03:28:39PM -0700, Manasi Navare wrote:
> DSC can be supported per DP connector. This patch adds a per connector
> debugfs node to expose DSC support capability by the kernel.
> The same node can be used from userspace to force DSC enable.

Why is the force_dsc thing split between two patches so strangely?

> 
> v2:
> * Use kstrtobool_from_user to avoid explicit error checking (Lyude)
> * Rebase on drm-tip (Manasi)
> 
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Cc: Lyude Paul <lyude@redhat.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Lyude Paul <lyude@redhat.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 71 ++++++++++++++++++++++++++++-
>  drivers/gpu/drm/i915/intel_dp.c     |  1 +
>  drivers/gpu/drm/i915/intel_drv.h    |  3 ++
>  3 files changed, 74 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 5cadfcd03ea9..6e631f08dd4b 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -4999,6 +4999,72 @@ static int i915_hdcp_sink_capability_show(struct seq_file *m, void *data)
>  }
>  DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
>  
> +static int i915_dsc_support_show(struct seq_file *m, void *data)
> +{
> +	struct drm_connector *connector = m->private;
> +	struct intel_encoder *encoder = intel_attached_encoder(connector);
> +	struct intel_dp *intel_dp =
> +		enc_to_intel_dp(&encoder->base);
> +	struct intel_crtc *crtc;
> +	struct intel_crtc_state *crtc_state;
> +
> +	crtc = to_intel_crtc(encoder->base.crtc);
> +	crtc_state = to_intel_crtc_state(crtc->base.state);
> +	drm_modeset_lock(&crtc->base.mutex, NULL);
> +	seq_printf(m, "Enabled: %s\n",
> +		   yesno(crtc_state->dsc_params.compression_enable));
> +	seq_printf(m, "Supported: %s\n",
> +		   yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
> +	drm_modeset_unlock(&crtc->base.mutex);
> +
> +	return 0;
> +}
> +
> +static ssize_t i915_dsc_support_write(struct file *file,
> +				      const char __user *ubuf,
> +				      size_t len, loff_t *offp)
> +{
> +	bool dsc_enable = false;
> +	int ret;
> +	struct drm_connector *connector =
> +		((struct seq_file *)file->private_data)->private;
> +	struct intel_encoder *encoder = intel_attached_encoder(connector);
> +	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> +
> +	if (len == 0)
> +		return 0;
> +
> +	DRM_DEBUG_DRIVER("Copied %d bytes from user to force DSC\n",
> +			 (unsigned int)len);
> +
> +	ret = kstrtobool_from_user(ubuf, len, &dsc_enable);
> +	if (ret < 0)
> +		return ret;
> +
> +	DRM_DEBUG_DRIVER("Got %s for DSC Enable\n",
> +			 (dsc_enable) ? "true" : "false");
> +	intel_dp->force_dsc_en = dsc_enable;
> +
> +	*offp += len;
> +	return len;
> +}
> +
> +static int i915_dsc_support_open(struct inode *inode,
> +				 struct file *file)
> +{
> +	return single_open(file, i915_dsc_support_show,
> +			   inode->i_private);
> +}
> +
> +static const struct file_operations i915_dsc_support_fops = {
> +	.owner = THIS_MODULE,
> +	.open = i915_dsc_support_open,
> +	.read = seq_read,
> +	.llseek = seq_lseek,
> +	.release = single_release,
> +	.write = i915_dsc_support_write
> +};
> +
>  /**
>   * i915_debugfs_connector_add - add i915 specific connector debugfs files
>   * @connector: pointer to a registered drm_connector
> @@ -5017,9 +5083,12 @@ int i915_debugfs_connector_add(struct drm_connector *connector)
>  		return -ENODEV;
>  
>  	if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
> -	    connector->connector_type == DRM_MODE_CONNECTOR_eDP)
> +	    connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
>  		debugfs_create_file("i915_dpcd", S_IRUGO, root,
>  				    connector, &i915_dpcd_fops);
> +		debugfs_create_file("i915_dsc_support", S_IRUGO, root,
> +				    connector, &i915_dsc_support_fops);
> +	}
>  
>  	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
>  		debugfs_create_file("i915_panel_timings", S_IRUGO, root,
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 72e6605f0ed7..0b5939992c2b 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -2287,6 +2287,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>  	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
>  		return false;
>  
> +	DRM_DEBUG_KMS("Force DSC en = %d\n", intel_dp->force_dsc_en);
>  	if (!intel_dp_compute_link_config(encoder, pipe_config))
>  		return false;
>  
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 4f5d17bcd54e..16bbc3768e02 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1196,6 +1196,9 @@ struct intel_dp {
>  
>  	/* Displayport compliance testing */
>  	struct intel_dp_compliance compliance;
> +
> +	/* Display stream compression testing */
> +	bool force_dsc_en;
>  };
>  
>  enum lspcon_vendor {
> -- 
> 2.18.0

-- 
Ville Syrjälä
Intel
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Re: [PATCH v6 27/28] drm/i915/dsc: Add Per connector debugfs node for DSC support/enable

[Manasi Navare]

On Mon, Oct 29, 2018 at 10:39:21PM +0200, Ville Syrjälä wrote:
> On Wed, Oct 24, 2018 at 03:28:39PM -0700, Manasi Navare wrote:
> > DSC can be supported per DP connector. This patch adds a per connector
> > debugfs node to expose DSC support capability by the kernel.
> > The same node can be used from userspace to force DSC enable.
> 
> Why is the force_dsc thing split between two patches so strangely?

This patch just defines the force_dsc and sets it through the debugfs
node. But how it configures DSC during atomic check is moved to a
separate patch. 
Would you prefer having that integrated with this patch itself?

Manasi

> 
> > 
> > v2:
> > * Use kstrtobool_from_user to avoid explicit error checking (Lyude)
> > * Rebase on drm-tip (Manasi)
> > 
> > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Cc: Lyude Paul <lyude@redhat.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Lyude Paul <lyude@redhat.com>
> > ---
> >  drivers/gpu/drm/i915/i915_debugfs.c | 71 ++++++++++++++++++++++++++++-
> >  drivers/gpu/drm/i915/intel_dp.c     |  1 +
> >  drivers/gpu/drm/i915/intel_drv.h    |  3 ++
> >  3 files changed, 74 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> > index 5cadfcd03ea9..6e631f08dd4b 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -4999,6 +4999,72 @@ static int i915_hdcp_sink_capability_show(struct seq_file *m, void *data)
> >  }
> >  DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
> >  
> > +static int i915_dsc_support_show(struct seq_file *m, void *data)
> > +{
> > +	struct drm_connector *connector = m->private;
> > +	struct intel_encoder *encoder = intel_attached_encoder(connector);
> > +	struct intel_dp *intel_dp =
> > +		enc_to_intel_dp(&encoder->base);
> > +	struct intel_crtc *crtc;
> > +	struct intel_crtc_state *crtc_state;
> > +
> > +	crtc = to_intel_crtc(encoder->base.crtc);
> > +	crtc_state = to_intel_crtc_state(crtc->base.state);
> > +	drm_modeset_lock(&crtc->base.mutex, NULL);
> > +	seq_printf(m, "Enabled: %s\n",
> > +		   yesno(crtc_state->dsc_params.compression_enable));
> > +	seq_printf(m, "Supported: %s\n",
> > +		   yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
> > +	drm_modeset_unlock(&crtc->base.mutex);
> > +
> > +	return 0;
> > +}
> > +
> > +static ssize_t i915_dsc_support_write(struct file *file,
> > +				      const char __user *ubuf,
> > +				      size_t len, loff_t *offp)
> > +{
> > +	bool dsc_enable = false;
> > +	int ret;
> > +	struct drm_connector *connector =
> > +		((struct seq_file *)file->private_data)->private;
> > +	struct intel_encoder *encoder = intel_attached_encoder(connector);
> > +	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> > +
> > +	if (len == 0)
> > +		return 0;
> > +
> > +	DRM_DEBUG_DRIVER("Copied %d bytes from user to force DSC\n",
> > +			 (unsigned int)len);
> > +
> > +	ret = kstrtobool_from_user(ubuf, len, &dsc_enable);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	DRM_DEBUG_DRIVER("Got %s for DSC Enable\n",
> > +			 (dsc_enable) ? "true" : "false");
> > +	intel_dp->force_dsc_en = dsc_enable;
> > +
> > +	*offp += len;
> > +	return len;
> > +}
> > +
> > +static int i915_dsc_support_open(struct inode *inode,
> > +				 struct file *file)
> > +{
> > +	return single_open(file, i915_dsc_support_show,
> > +			   inode->i_private);
> > +}
> > +
> > +static const struct file_operations i915_dsc_support_fops = {
> > +	.owner = THIS_MODULE,
> > +	.open = i915_dsc_support_open,
> > +	.read = seq_read,
> > +	.llseek = seq_lseek,
> > +	.release = single_release,
> > +	.write = i915_dsc_support_write
> > +};
> > +
> >  /**
> >   * i915_debugfs_connector_add - add i915 specific connector debugfs files
> >   * @connector: pointer to a registered drm_connector
> > @@ -5017,9 +5083,12 @@ int i915_debugfs_connector_add(struct drm_connector *connector)
> >  		return -ENODEV;
> >  
> >  	if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
> > -	    connector->connector_type == DRM_MODE_CONNECTOR_eDP)
> > +	    connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
> >  		debugfs_create_file("i915_dpcd", S_IRUGO, root,
> >  				    connector, &i915_dpcd_fops);
> > +		debugfs_create_file("i915_dsc_support", S_IRUGO, root,
> > +				    connector, &i915_dsc_support_fops);
> > +	}
> >  
> >  	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
> >  		debugfs_create_file("i915_panel_timings", S_IRUGO, root,
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > index 72e6605f0ed7..0b5939992c2b 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -2287,6 +2287,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> >  	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
> >  		return false;
> >  
> > +	DRM_DEBUG_KMS("Force DSC en = %d\n", intel_dp->force_dsc_en);
> >  	if (!intel_dp_compute_link_config(encoder, pipe_config))
> >  		return false;
> >  
> > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > index 4f5d17bcd54e..16bbc3768e02 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -1196,6 +1196,9 @@ struct intel_dp {
> >  
> >  	/* Displayport compliance testing */
> >  	struct intel_dp_compliance compliance;
> > +
> > +	/* Display stream compression testing */
> > +	bool force_dsc_en;
> >  };
> >  
> >  enum lspcon_vendor {
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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Re: [PATCH v6 27/28] drm/i915/dsc: Add Per connector debugfs node for DSC support/enable

[Ville Syrjälä]

On Mon, Oct 29, 2018 at 02:35:36PM -0700, Manasi Navare wrote:
> On Mon, Oct 29, 2018 at 10:39:21PM +0200, Ville Syrjälä wrote:
> > On Wed, Oct 24, 2018 at 03:28:39PM -0700, Manasi Navare wrote:
> > > DSC can be supported per DP connector. This patch adds a per connector
> > > debugfs node to expose DSC support capability by the kernel.
> > > The same node can be used from userspace to force DSC enable.
> > 
> > Why is the force_dsc thing split between two patches so strangely?
> 
> This patch just defines the force_dsc and sets it through the debugfs
> node. But how it configures DSC during atomic check is moved to a
> separate patch. 
> Would you prefer having that integrated with this patch itself?

Either that or split it in into "read only debugfs status" +
"add dsc_force" patches.

> 
> Manasi
> 
> > 
> > > 
> > > v2:
> > > * Use kstrtobool_from_user to avoid explicit error checking (Lyude)
> > > * Rebase on drm-tip (Manasi)
> > > 
> > > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > > Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > > Cc: Lyude Paul <lyude@redhat.com>
> > > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > > Reviewed-by: Lyude Paul <lyude@redhat.com>
> > > ---
> > >  drivers/gpu/drm/i915/i915_debugfs.c | 71 ++++++++++++++++++++++++++++-
> > >  drivers/gpu/drm/i915/intel_dp.c     |  1 +
> > >  drivers/gpu/drm/i915/intel_drv.h    |  3 ++
> > >  3 files changed, 74 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> > > index 5cadfcd03ea9..6e631f08dd4b 100644
> > > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > > @@ -4999,6 +4999,72 @@ static int i915_hdcp_sink_capability_show(struct seq_file *m, void *data)
> > >  }
> > >  DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
> > >  
> > > +static int i915_dsc_support_show(struct seq_file *m, void *data)
> > > +{
> > > +	struct drm_connector *connector = m->private;
> > > +	struct intel_encoder *encoder = intel_attached_encoder(connector);
> > > +	struct intel_dp *intel_dp =
> > > +		enc_to_intel_dp(&encoder->base);
> > > +	struct intel_crtc *crtc;
> > > +	struct intel_crtc_state *crtc_state;
> > > +
> > > +	crtc = to_intel_crtc(encoder->base.crtc);
> > > +	crtc_state = to_intel_crtc_state(crtc->base.state);
> > > +	drm_modeset_lock(&crtc->base.mutex, NULL);
> > > +	seq_printf(m, "Enabled: %s\n",
> > > +		   yesno(crtc_state->dsc_params.compression_enable));
> > > +	seq_printf(m, "Supported: %s\n",
> > > +		   yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
> > > +	drm_modeset_unlock(&crtc->base.mutex);
> > > +
> > > +	return 0;
> > > +}
> > > +
> > > +static ssize_t i915_dsc_support_write(struct file *file,
> > > +				      const char __user *ubuf,
> > > +				      size_t len, loff_t *offp)
> > > +{
> > > +	bool dsc_enable = false;
> > > +	int ret;
> > > +	struct drm_connector *connector =
> > > +		((struct seq_file *)file->private_data)->private;
> > > +	struct intel_encoder *encoder = intel_attached_encoder(connector);
> > > +	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> > > +
> > > +	if (len == 0)
> > > +		return 0;
> > > +
> > > +	DRM_DEBUG_DRIVER("Copied %d bytes from user to force DSC\n",
> > > +			 (unsigned int)len);
> > > +
> > > +	ret = kstrtobool_from_user(ubuf, len, &dsc_enable);
> > > +	if (ret < 0)
> > > +		return ret;
> > > +
> > > +	DRM_DEBUG_DRIVER("Got %s for DSC Enable\n",
> > > +			 (dsc_enable) ? "true" : "false");
> > > +	intel_dp->force_dsc_en = dsc_enable;
> > > +
> > > +	*offp += len;
> > > +	return len;
> > > +}
> > > +
> > > +static int i915_dsc_support_open(struct inode *inode,
> > > +				 struct file *file)
> > > +{
> > > +	return single_open(file, i915_dsc_support_show,
> > > +			   inode->i_private);
> > > +}
> > > +
> > > +static const struct file_operations i915_dsc_support_fops = {
> > > +	.owner = THIS_MODULE,
> > > +	.open = i915_dsc_support_open,
> > > +	.read = seq_read,
> > > +	.llseek = seq_lseek,
> > > +	.release = single_release,
> > > +	.write = i915_dsc_support_write
> > > +};
> > > +
> > >  /**
> > >   * i915_debugfs_connector_add - add i915 specific connector debugfs files
> > >   * @connector: pointer to a registered drm_connector
> > > @@ -5017,9 +5083,12 @@ int i915_debugfs_connector_add(struct drm_connector *connector)
> > >  		return -ENODEV;
> > >  
> > >  	if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
> > > -	    connector->connector_type == DRM_MODE_CONNECTOR_eDP)
> > > +	    connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
> > >  		debugfs_create_file("i915_dpcd", S_IRUGO, root,
> > >  				    connector, &i915_dpcd_fops);
> > > +		debugfs_create_file("i915_dsc_support", S_IRUGO, root,
> > > +				    connector, &i915_dsc_support_fops);
> > > +	}
> > >  
> > >  	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
> > >  		debugfs_create_file("i915_panel_timings", S_IRUGO, root,
> > > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > > index 72e6605f0ed7..0b5939992c2b 100644
> > > --- a/drivers/gpu/drm/i915/intel_dp.c
> > > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > > @@ -2287,6 +2287,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> > >  	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
> > >  		return false;
> > >  
> > > +	DRM_DEBUG_KMS("Force DSC en = %d\n", intel_dp->force_dsc_en);
> > >  	if (!intel_dp_compute_link_config(encoder, pipe_config))
> > >  		return false;
> > >  
> > > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > > index 4f5d17bcd54e..16bbc3768e02 100644
> > > --- a/drivers/gpu/drm/i915/intel_drv.h
> > > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > > @@ -1196,6 +1196,9 @@ struct intel_dp {
> > >  
> > >  	/* Displayport compliance testing */
> > >  	struct intel_dp_compliance compliance;
> > > +
> > > +	/* Display stream compression testing */
> > > +	bool force_dsc_en;
> > >  };
> > >  
> > >  enum lspcon_vendor {
> > > -- 
> > > 2.18.0
> > 
> > -- 
> > Ville Syrjälä
> > Intel

-- 
Ville Syrjälä
Intel
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[PATCH v6 28/28] drm/i915/dsc: Force DSC enable if requested by IGT/userspace

[Manasi Navare]

Currently the driver will only enable DSC if a certain mode
does not fit the available link BW. However IGT/userspace
can force DSC enable through dsc support debugfs node to
test the DSC functionality if supported by the panel.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 0b5939992c2b..3df73f18212e 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2188,12 +2188,13 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
 							&limits);
 
 	/* enable compression if the mode doesn't fit available BW */
-	if (!ret) {
-		DRM_DEBUG_KMS("DP required Link rate %i does not fit available %i\n",
-			      intel_dp_link_required(adjusted_mode->crtc_clock,
-						     pipe_config->pipe_bpp),
-			      intel_dp_max_data_rate(pipe_config->port_clock,
-						     pipe_config->lane_count));
+	if (!ret || intel_dp->force_dsc_en) {
+		if (!ret)
+			DRM_DEBUG_KMS("DP required Link rate %i does not fit available %i\n",
+				      intel_dp_link_required(adjusted_mode->crtc_clock,
+							     pipe_config->pipe_bpp),
+				      intel_dp_max_data_rate(pipe_config->port_clock,
+							     pipe_config->lane_count));
 
 		if (!intel_dp_dsc_compute_config(intel_dp, pipe_config,
 						 &limits))
-- 
2.18.0

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✗ Fi.CI.CHECKPATCH: warning for Display Stream Compression enabling on eDP/DP (rev6)

[Patchwork]

== Series Details ==

Series: Display Stream Compression enabling on eDP/DP (rev6)
URL   : https://patchwork.freedesktop.org/series/47514/
State : warning

== Summary ==

$ dim checkpatch origin/drm-tip
505058122024 drm/i915/dsc: Add slice_row_per_frame in DSC PPS programming
65c4be454ee2 drm/dp: Add DP DSC DPCD receiver capability size define and missing SHIFT
3297b44e5b4a drm/i915/dp: Cache the DP/eDP DSC DPCD register set on Hotplug/eDP Init
b2e562b367de drm/dp: DRM DP helper/macros to get DP sink DSC parameters
e2aa0523be2a drm/i915/dp: Add helpers for Compressed BPP and Slice Count for DSC
-:27: WARNING:COMMIT_LOG_LONG_LINE: Possible unwrapped commit description (prefer a maximum 75 chars per line)
#27: 
* rename it as SMALL_JOINER since we are not enabling big joiner yet (Anusha)

total: 0 errors, 1 warnings, 0 checks, 132 lines checked
46330d716de4 drm/i915/dp: Validate modes using max Output BPP and slice count when DSC supported
1a54cc15e603 drm/dp: Define payload size for DP SDP PPS packet
bd10384561a7 drm/dsc: Define Display Stream Compression PPS infoframe
-:27: WARNING:FILE_PATH_CHANGES: added, moved or deleted file(s), does MAINTAINERS need updating?
#27: 
new file mode 100644

total: 0 errors, 1 warnings, 0 checks, 347 lines checked
09e060ef0218 drm/dsc: Define VESA Display Stream Compression Capabilities
-:34: WARNING:BAD_SIGN_OFF: Non-standard signature: Co-developed-by:
#34: 
Co-developed-by: Manasi Navare <manasi.d.navare@intel.com>

-:73: CHECK:BOOL_MEMBER: Avoid using bool structure members because of possible alignment issues - see: https://lkml.org/lkml/2017/11/21/384
#73: FILE: include/drm/drm_dsc.h:40:
+	bool convert_rgb;

-:83: CHECK:BOOL_MEMBER: Avoid using bool structure members because of possible alignment issues - see: https://lkml.org/lkml/2017/11/21/384
#83: FILE: include/drm/drm_dsc.h:50:
+	bool enable422;

-:108: CHECK:BOOL_MEMBER: Avoid using bool structure members because of possible alignment issues - see: https://lkml.org/lkml/2017/11/21/384
#108: FILE: include/drm/drm_dsc.h:75:
+	bool block_pred_enable;

-:136: CHECK:BOOL_MEMBER: Avoid using bool structure members because of possible alignment issues - see: https://lkml.org/lkml/2017/11/21/384
#136: FILE: include/drm/drm_dsc.h:103:
+	bool vbr_enable;

-:151: CHECK:BOOL_MEMBER: Avoid using bool structure members because of possible alignment issues - see: https://lkml.org/lkml/2017/11/21/384
#151: FILE: include/drm/drm_dsc.h:118:
+	bool native_422;

-:153: CHECK:BOOL_MEMBER: Avoid using bool structure members because of possible alignment issues - see: https://lkml.org/lkml/2017/11/21/384
#153: FILE: include/drm/drm_dsc.h:120:
+	bool native_420;

total: 0 errors, 1 warnings, 6 checks, 121 lines checked
00284849c0ea drm/dsc: Define Rate Control values that do not change over configurations
-:42: WARNING:NO_AUTHOR_SIGN_OFF: Missing Signed-off-by: line by nominal patch author 'Srivatsa, Anusha <anusha.srivatsa@intel.com>'

total: 0 errors, 1 warnings, 0 checks, 12 lines checked
7a5170588817 drm/dsc: Add helpers for DSC picture parameter set infoframes
-:23: WARNING:COMMIT_LOG_LONG_LINE: Possible unwrapped commit description (prefer a maximum 75 chars per line)
#23: 
* Add reference to added kernel-docs in Documentation/gpu/drm-kms-helpers.rst

-:74: WARNING:FILE_PATH_CHANGES: added, moved or deleted file(s), does MAINTAINERS need updating?
#74: 
new file mode 100644

total: 0 errors, 2 warnings, 0 checks, 287 lines checked
582b014a0f5e drm/i915/dp: Add DSC params and DSC config to intel_crtc_state
-:49: CHECK:BOOL_MEMBER: Avoid using bool structure members because of possible alignment issues - see: https://lkml.org/lkml/2017/11/21/384
#49: FILE: drivers/gpu/drm/i915/intel_drv.h:937:
+		bool compression_enable;

-:50: CHECK:BOOL_MEMBER: Avoid using bool structure members because of possible alignment issues - see: https://lkml.org/lkml/2017/11/21/384
#50: FILE: drivers/gpu/drm/i915/intel_drv.h:938:
+		bool dsc_split;

total: 0 errors, 0 warnings, 2 checks, 22 lines checked
20570f6b293a drm/i915/dp: Compute DSC pipe config in atomic check
440712b2da5b drm/i915/dp: Do not enable PSR2 if DSC is enabled
195fcfce9a89 drm/dsc: Define the DSC 1.1 and 1.2 Line Buffer depth constants
9f0f36374af7 drm/i915/dsc: Define & Compute VESA DSC params
-:65: WARNING:BAD_SIGN_OFF: Non-standard signature: Co-developed-by:
#65: 
Co-developed-by: Manasi Navare <manasi.d.navare@intel.com>

-:92: WARNING:MISSING_SPACE: break quoted strings at a space character
#92: FILE: drivers/gpu/drm/i915/intel_dp.c:2108:
+		DRM_ERROR("Cannot compute valid DSC parameters for Input Bpp = %d"
+			  "Compressed BPP = %d\n",

-:116: WARNING:FILE_PATH_CHANGES: added, moved or deleted file(s), does MAINTAINERS need updating?
#116: 
new file mode 100644

-:402: CHECK:LINE_SPACING: Please use a blank line after function/struct/union/enum declarations
#402: FILE: drivers/gpu/drm/i915/intel_vdsc.c:282:
+}
+};

total: 0 errors, 3 warnings, 1 checks, 496 lines checked
d6b6d6978a59 drm/i915/dsc: Compute Rate Control parameters for DSC
-:138: CHECK:SPACING: space preferred before that '*' (ctx:VxE)
#138: FILE: drivers/gpu/drm/i915/intel_vdsc.c:411:
+				vdsc_cfg->slice_bpg_offset)*
 				                           ^

-:170: CHECK:LINE_SPACING: Please don't use multiple blank lines
#170: FILE: drivers/gpu/drm/i915/intel_vdsc.c:443:
+
+

total: 0 errors, 0 warnings, 2 checks, 138 lines checked
56c7d38bb119 drm/i915/dp: Enable/Disable DSC in DP Sink
a865b5379b76 drm/i915/dsc: Add a power domain for VDSC on eDP/MIPI DSI
3c721d22e6b7 drm/i915/dp: Configure i915 Picture parameter Set registers during DSC enabling
-:41: CHECK:AVOID_EXTERNS: extern prototypes should be avoided in .h files
#41: FILE: drivers/gpu/drm/i915/i915_drv.h:3490:
+extern void intel_dsc_enable(struct intel_encoder *encoder,

-:109: WARNING:TABSTOP: Statements should start on a tabstop
#109: FILE: drivers/gpu/drm/i915/intel_vdsc.c:621:
+	 if (cpu_transcoder == TRANSCODER_EDP) {

-:353: CHECK:SPACING: spaces preferred around that '/' (ctx:VxV)
#353: FILE: drivers/gpu/drm/i915/intel_vdsc.c:865:
+		rc_buf_thresh_dword[i/4] |= (u32)(vdsc_cfg->rc_buf_thresh[i] <<
 		                     ^

-:356: CHECK:SPACING: spaces preferred around that '/' (ctx:VxV)
#356: FILE: drivers/gpu/drm/i915/intel_vdsc.c:868:
+			 rc_buf_thresh_dword[i/4]);
 			                      ^

-:397: WARNING:LONG_LINE: line over 100 characters
#397: FILE: drivers/gpu/drm/i915/intel_vdsc.c:909:
+		rc_range_params_dword[i/2] |= (u32)(((vdsc_cfg->rc_range_params[i].range_bpg_offset <<

-:397: CHECK:SPACING: spaces preferred around that '/' (ctx:VxV)
#397: FILE: drivers/gpu/drm/i915/intel_vdsc.c:909:
+		rc_range_params_dword[i/2] |= (u32)(((vdsc_cfg->rc_range_params[i].range_bpg_offset <<
 		                       ^

-:404: CHECK:SPACING: spaces preferred around that '/' (ctx:VxV)
#404: FILE: drivers/gpu/drm/i915/intel_vdsc.c:916:
+			 rc_range_params_dword[i/2]);
 			                        ^

-:482: CHECK:BRACES: Blank lines aren't necessary after an open brace '{'
#482: FILE: drivers/gpu/drm/i915/intel_vdsc.c:994:
+{
+

-:489: WARNING:RETURN_VOID: void function return statements are not generally useful
#489: FILE: drivers/gpu/drm/i915/intel_vdsc.c:1001:
+	return;
+}

total: 0 errors, 3 warnings, 6 checks, 442 lines checked
fb717c355546 drm/i915/dp: Use the existing write_infoframe() for DSC PPS SDPs
da844dee6b19 drm/i915/dp: Populate DSC PPS SDP and send PPS infoframes
230dbd9930ac drm/i915/icl: Add Display Stream Splitter control registers
-:68: WARNING:NO_AUTHOR_SIGN_OFF: Missing Signed-off-by: line by nominal patch author 'Srivatsa, Anusha <anusha.srivatsa@intel.com>'

total: 0 errors, 1 warnings, 0 checks, 39 lines checked
b62bb4e85604 drm/i915/dp: Configure Display stream splitter registers during DSC enable
9200945a117c drm/i915/dp: Disable DSC in source by disabling DSS CTL bits
-:33: CHECK:AVOID_EXTERNS: extern prototypes should be avoided in .h files
#33: FILE: drivers/gpu/drm/i915/i915_drv.h:3492:
+extern void intel_dsc_disable(struct intel_encoder *encoder,

-:109: CHECK:BRACES: Blank lines aren't necessary before a close brace '}'
#109: FILE: drivers/gpu/drm/i915/intel_vdsc.c:1077:
+
+}

total: 0 errors, 0 warnings, 2 checks, 69 lines checked
53854c11c5b4 drm/i915/dsc: Enable and disable appropriate power wells for VDSC
71c628fb823d drm/i915/dsc: Add Per connector debugfs node for DSC support/enable
-:107: WARNING:SYMBOLIC_PERMS: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
#107: FILE: drivers/gpu/drm/i915/i915_debugfs.c:5089:
+		debugfs_create_file("i915_dsc_support", S_IRUGO, root,

-:135: CHECK:BOOL_MEMBER: Avoid using bool structure members because of possible alignment issues - see: https://lkml.org/lkml/2017/11/21/384
#135: FILE: drivers/gpu/drm/i915/intel_drv.h:1201:
+	bool force_dsc_en;

total: 0 errors, 1 warnings, 1 checks, 101 lines checked
0bdf5927b4a1 drm/i915/dsc: Force DSC enable if requested by IGT/userspace

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✗ Fi.CI.SPARSE: warning for Display Stream Compression enabling on eDP/DP (rev6)

[Patchwork]

== Series Details ==

Series: Display Stream Compression enabling on eDP/DP (rev6)
URL   : https://patchwork.freedesktop.org/series/47514/
State : warning

== Summary ==

$ dim sparse origin/drm-tip
Sparse version: v0.5.2
Commit: drm/i915/dsc: Add slice_row_per_frame in DSC PPS programming
Okay!

Commit: drm/dp: Add DP DSC DPCD receiver capability size define and missing SHIFT
Okay!

Commit: drm/i915/dp: Cache the DP/eDP DSC DPCD register set on Hotplug/eDP Init
Okay!

Commit: drm/dp: DRM DP helper/macros to get DP sink DSC parameters
Okay!

Commit: drm/i915/dp: Add helpers for Compressed BPP and Slice Count for DSC
+drivers/gpu/drm/i915/intel_dp.c:4208:26: warning: expression using sizeof(void)
+drivers/gpu/drm/i915/intel_dp.c:4208:26: warning: expression using sizeof(void)
+drivers/gpu/drm/i915/intel_dp.c:4251:27: warning: expression using sizeof(void)
+drivers/gpu/drm/i915/intel_dp.c:4251:27: warning: expression using sizeof(void)

Commit: drm/i915/dp: Validate modes using max Output BPP and slice count when DSC supported
Okay!

Commit: drm/dp: Define payload size for DP SDP PPS packet
Okay!

Commit: drm/dsc: Define Display Stream Compression PPS infoframe
Okay!

Commit: drm/dsc: Define VESA Display Stream Compression Capabilities
Okay!

Commit: drm/dsc: Define Rate Control values that do not change over configurations
Okay!

Commit: drm/dsc: Add helpers for DSC picture parameter set infoframes
-
+drivers/gpu/drm/drm_dsc.c:195:61:    expected restricted __be16 <noident>
+drivers/gpu/drm/drm_dsc.c:195:61:    got unsigned short [unsigned] [usertype] <noident>
+drivers/gpu/drm/drm_dsc.c:195:61: warning: incorrect type in assignment (different base types)
+drivers/gpu/drm/drm_dsc.c:202:25:    expected unsigned short [unsigned] [usertype] val
+drivers/gpu/drm/drm_dsc.c:202:25:    got restricted __be16 <noident>
+drivers/gpu/drm/drm_dsc.c:202:25: warning: cast from restricted __be16
+drivers/gpu/drm/drm_dsc.c:202:25: warning: cast from restricted __be16
+drivers/gpu/drm/drm_dsc.c:202:25: warning: cast from restricted __be16
+drivers/gpu/drm/drm_dsc.c:202:25: warning: incorrect type in argument 1 (different base types)

Commit: drm/i915/dp: Add DSC params and DSC config to intel_crtc_state
-drivers/gpu/drm/i915/selftests/../i915_drv.h:3707:16: warning: expression using sizeof(void)
+drivers/gpu/drm/i915/selftests/../i915_drv.h:3708:16: warning: expression using sizeof(void)

Commit: drm/i915/dp: Compute DSC pipe config in atomic check
+drivers/gpu/drm/i915/intel_dp.c:1932:23: warning: expression using sizeof(void)

Commit: drm/i915/dp: Do not enable PSR2 if DSC is enabled
Okay!

Commit: drm/dsc: Define the DSC 1.1 and 1.2 Line Buffer depth constants
Okay!

Commit: drm/i915/dsc: Define & Compute VESA DSC params
+drivers/gpu/drm/i915/intel_vdsc.c:351:17: warning: expression using sizeof(void)
+./include/uapi/linux/perf_event.h:147:56: warning: cast truncates bits from constant value (8000000000000000 becomes 0)

Commit: drm/i915/dsc: Compute Rate Control parameters for DSC
Okay!

Commit: drm/i915/dp: Enable/Disable DSC in DP Sink
Okay!

Commit: drm/i915/dsc: Add a power domain for VDSC on eDP/MIPI DSI
Okay!

Commit: drm/i915/dp: Configure i915 Picture parameter Set registers during DSC enabling
-drivers/gpu/drm/i915/selftests/../i915_drv.h:3708:16: warning: expression using sizeof(void)
+drivers/gpu/drm/i915/selftests/../i915_drv.h:3710:16: warning: expression using sizeof(void)

Commit: drm/i915/dp: Use the existing write_infoframe() for DSC PPS SDPs
Okay!

Commit: drm/i915/dp: Populate DSC PPS SDP and send PPS infoframes
Okay!

Commit: drm/i915/icl: Add Display Stream Splitter control registers
Okay!

Commit: drm/i915/dp: Configure Display stream splitter registers during DSC enable
Okay!

Commit: drm/i915/dp: Disable DSC in source by disabling DSS CTL bits
-drivers/gpu/drm/i915/selftests/../i915_drv.h:3710:16: warning: expression using sizeof(void)
+drivers/gpu/drm/i915/selftests/../i915_drv.h:3712:16: warning: expression using sizeof(void)

Commit: drm/i915/dsc: Enable and disable appropriate power wells for VDSC
Okay!

Commit: drm/i915/dsc: Add Per connector debugfs node for DSC support/enable
Okay!

Commit: drm/i915/dsc: Force DSC enable if requested by IGT/userspace
Okay!

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✗ Fi.CI.BAT: failure for Display Stream Compression enabling on eDP/DP (rev6)

[Patchwork]

== Series Details ==

Series: Display Stream Compression enabling on eDP/DP (rev6)
URL   : https://patchwork.freedesktop.org/series/47514/
State : failure

== Summary ==

= CI Bug Log - changes from CI_DRM_5033 -> Patchwork_10569 =

== Summary - FAILURE ==

  Serious unknown changes coming with Patchwork_10569 absolutely need to be
  verified manually.
  
  If you think the reported changes have nothing to do with the changes
  introduced in Patchwork_10569, please notify your bug team to allow them
  to document this new failure mode, which will reduce false positives in CI.

  External URL: https://patchwork.freedesktop.org/api/1.0/series/47514/revisions/6/mbox/

== Possible new issues ==

  Here are the unknown changes that may have been introduced in Patchwork_10569:

  === IGT changes ===

    ==== Possible regressions ====

    igt@debugfs_test@read_all_entries:
      fi-skl-iommu:       PASS -> INCOMPLETE +1
      fi-cfl-s3:          PASS -> INCOMPLETE +1
      fi-icl-u:           PASS -> INCOMPLETE +2
      fi-skl-6700hq:      PASS -> INCOMPLETE +1
      fi-skl-6770hq:      PASS -> INCOMPLETE +1
      fi-skl-6260u:       PASS -> INCOMPLETE +1
      fi-skl-6600u:       PASS -> INCOMPLETE
      fi-kbl-soraka:      PASS -> INCOMPLETE

    igt@drv_module_reload@basic-reload:
      fi-cnl-u:           PASS -> INCOMPLETE +1
      fi-kbl-x1275:       PASS -> INCOMPLETE +1
      fi-kbl-r:           PASS -> INCOMPLETE +1
      fi-cfl-8700k:       PASS -> INCOMPLETE +1
      fi-ivb-3520m:       PASS -> INCOMPLETE +1
      fi-hsw-4770:        PASS -> INCOMPLETE +1
      fi-bsw-n3050:       PASS -> INCOMPLETE +1
      fi-bsw-kefka:       PASS -> INCOMPLETE +1
      fi-kbl-7567u:       PASS -> INCOMPLETE +1
      fi-whl-u:           PASS -> INCOMPLETE +1
      fi-skl-6700k2:      PASS -> INCOMPLETE +1

    
    ==== Warnings ====

    igt@pm_rpm@module-reload:
      fi-hsw-4770r:       SKIP -> PASS

    
== Known issues ==

  Here are the changes found in Patchwork_10569 that come from known issues:

  === IGT changes ===

    ==== Issues hit ====

    igt@debugfs_test@read_all_entries:
      fi-glk-dsi:         PASS -> INCOMPLETE (fdo#103359, k.org#198133) +1
      fi-bxt-j4205:       PASS -> INCOMPLETE (fdo#103927) +1
      fi-byt-n2820:       PASS -> INCOMPLETE (fdo#102657) +1
      fi-elk-e7500:       PASS -> INCOMPLETE (fdo#103989) +1
      fi-skl-gvtdvm:      PASS -> INCOMPLETE (fdo#105600) +1

    igt@drv_module_reload@basic-reload:
      fi-skl-guc:         PASS -> INCOMPLETE (fdo#106693) +1
      fi-bdw-gvtdvm:      PASS -> INCOMPLETE (fdo#105600) +1
      fi-bxt-dsi:         PASS -> INCOMPLETE (fdo#103927) +1
      fi-cfl-guc:         PASS -> INCOMPLETE (fdo#106693) +1
      fi-kbl-guc:         PASS -> INCOMPLETE (fdo#106693) +1
      fi-byt-clapper:     PASS -> INCOMPLETE (fdo#102657) +1
      fi-byt-j1900:       PASS -> INCOMPLETE (fdo#102657) +1
      fi-apl-guc:         PASS -> INCOMPLETE (fdo#106693) +1
      fi-glk-j4005:       PASS -> DMESG-WARN (fdo#106248, fdo#106725)
      fi-skl-6600u:       PASS -> INCOMPLETE (fdo#104108)
      fi-kbl-7560u:       PASS -> INCOMPLETE (fdo#103665) +1

    igt@kms_flip@basic-flip-vs-wf_vblank:
      fi-glk-j4005:       PASS -> FAIL (fdo#100368)

    
    ==== Possible fixes ====

    igt@drv_module_reload@basic-reload-inject:
      fi-hsw-4770r:       DMESG-WARN (fdo#107425, fdo#107924) -> PASS

    
  fdo#100368 https://bugs.freedesktop.org/show_bug.cgi?id=100368
  fdo#102657 https://bugs.freedesktop.org/show_bug.cgi?id=102657
  fdo#103359 https://bugs.freedesktop.org/show_bug.cgi?id=103359
  fdo#103665 https://bugs.freedesktop.org/show_bug.cgi?id=103665
  fdo#103927 https://bugs.freedesktop.org/show_bug.cgi?id=103927
  fdo#103989 https://bugs.freedesktop.org/show_bug.cgi?id=103989
  fdo#104108 https://bugs.freedesktop.org/show_bug.cgi?id=104108
  fdo#105600 https://bugs.freedesktop.org/show_bug.cgi?id=105600
  fdo#106248 https://bugs.freedesktop.org/show_bug.cgi?id=106248
  fdo#106693 https://bugs.freedesktop.org/show_bug.cgi?id=106693
  fdo#106725 https://bugs.freedesktop.org/show_bug.cgi?id=106725
  fdo#107425 https://bugs.freedesktop.org/show_bug.cgi?id=107425
  fdo#107924 https://bugs.freedesktop.org/show_bug.cgi?id=107924
  k.org#198133 https://bugzilla.kernel.org/show_bug.cgi?id=198133


== Participating hosts (47 -> 43) ==

  Missing    (4): fi-ctg-p8600 fi-ilk-m540 fi-byt-squawks fi-bsw-cyan 


== Build changes ==

    * Linux: CI_DRM_5033 -> Patchwork_10569

  CI_DRM_5033: f935e4c7634781e6ffef10bb8a1c93225ac42d90 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_4691: d445be01f5edc7e7a324444c73e221c9ed75602e @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_10569: 0bdf5927b4a19a910a074c3816b42f63a3395f19 @ git://anongit.freedesktop.org/gfx-ci/linux


== Linux commits ==

0bdf5927b4a1 drm/i915/dsc: Force DSC enable if requested by IGT/userspace
71c628fb823d drm/i915/dsc: Add Per connector debugfs node for DSC support/enable
53854c11c5b4 drm/i915/dsc: Enable and disable appropriate power wells for VDSC
9200945a117c drm/i915/dp: Disable DSC in source by disabling DSS CTL bits
b62bb4e85604 drm/i915/dp: Configure Display stream splitter registers during DSC enable
230dbd9930ac drm/i915/icl: Add Display Stream Splitter control registers
da844dee6b19 drm/i915/dp: Populate DSC PPS SDP and send PPS infoframes
fb717c355546 drm/i915/dp: Use the existing write_infoframe() for DSC PPS SDPs
3c721d22e6b7 drm/i915/dp: Configure i915 Picture parameter Set registers during DSC enabling
a865b5379b76 drm/i915/dsc: Add a power domain for VDSC on eDP/MIPI DSI
56c7d38bb119 drm/i915/dp: Enable/Disable DSC in DP Sink
d6b6d6978a59 drm/i915/dsc: Compute Rate Control parameters for DSC
9f0f36374af7 drm/i915/dsc: Define & Compute VESA DSC params
195fcfce9a89 drm/dsc: Define the DSC 1.1 and 1.2 Line Buffer depth constants
440712b2da5b drm/i915/dp: Do not enable PSR2 if DSC is enabled
20570f6b293a drm/i915/dp: Compute DSC pipe config in atomic check
582b014a0f5e drm/i915/dp: Add DSC params and DSC config to intel_crtc_state
7a5170588817 drm/dsc: Add helpers for DSC picture parameter set infoframes
00284849c0ea drm/dsc: Define Rate Control values that do not change over configurations
09e060ef0218 drm/dsc: Define VESA Display Stream Compression Capabilities
bd10384561a7 drm/dsc: Define Display Stream Compression PPS infoframe
1a54cc15e603 drm/dp: Define payload size for DP SDP PPS packet
46330d716de4 drm/i915/dp: Validate modes using max Output BPP and slice count when DSC supported
e2aa0523be2a drm/i915/dp: Add helpers for Compressed BPP and Slice Count for DSC
b2e562b367de drm/dp: DRM DP helper/macros to get DP sink DSC parameters
3297b44e5b4a drm/i915/dp: Cache the DP/eDP DSC DPCD register set on Hotplug/eDP Init
65c4be454ee2 drm/dp: Add DP DSC DPCD receiver capability size define and missing SHIFT
505058122024 drm/i915/dsc: Add slice_row_per_frame in DSC PPS programming

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_10569/issues.html
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Re: [PATCH v6 00/28] Display Stream Compression enabling on eDP/DP

[Manasi Navare]

Pushed first 7 patches of this series, thanks for the reviews.

Manasi

On Wed, Oct 24, 2018 at 03:28:12PM -0700, Manasi Navare wrote:
> VESA has developed an industry standard Display Stream Compression(DSC)
> for interoperable, visually lossless compression over display links to
> address the needs for higher resolution displays.
> 
> This patch series enables DSC on Gen 10 eDP and Gen 11 eDP/DP panels.
> This implementation is based on VESA DP 1.4 and DSC specifications.
> 
> These patches have been validated on 1080p eDP 1.4 panel with DSC support
> and FPGA based DP 1.4 sink device for following configurations:
> 
> - DSC with both VDSC engines enabled
> - DSC with only Left VDSC engine enabled
> - DSC for Input = 24bpp, Output = 8bpp
> - DSC for Input = 24bpp, Output = 10bpp
> - DSC for Input = 24bpp, output = 12bpp
> 
> This revision addresses the review feedback on previous version of the patch set:
> https://patchwork.freedesktop.org/series/47514/
> 
> Anusha Srivatsa (1):
>   drm/i915/dsc: Add slice_row_per_frame in DSC PPS programming
> 
> Gaurav K Singh (4):
>   drm/dsc: Define VESA Display Stream Compression Capabilities
>   drm/i915/dsc: Define & Compute VESA DSC params
>   drm/i915/dsc: Compute Rate Control parameters for DSC
>   drm/i915/dp: Enable/Disable DSC in DP Sink
> 
> Manasi Navare (21):
>   drm/dp: Add DP DSC DPCD receiver capability size define and missing
>     SHIFT
>   drm/i915/dp: Cache the DP/eDP DSC DPCD register set on Hotplug/eDP
>     Init
>   drm/dp: DRM DP helper/macros to get DP sink DSC parameters
>   drm/i915/dp: Add helpers for Compressed BPP and Slice Count for DSC
>   drm/i915/dp: Validate modes using max Output BPP and slice count when
>     DSC supported
>   drm/dp: Define payload size for DP SDP PPS packet
>   drm/dsc: Define Display Stream Compression PPS infoframe
>   drm/dsc: Add helpers for DSC picture parameter set infoframes
>   drm/i915/dp: Add DSC params and DSC config to intel_crtc_state
>   drm/i915/dp: Compute DSC pipe config in atomic check
>   drm/i915/dp: Do not enable PSR2 if DSC is enabled
>   drm/dsc: Define the DSC 1.1 and 1.2 Line Buffer depth constants
>   drm/i915/dsc: Add a power domain for VDSC on eDP/MIPI DSI
>   drm/i915/dp: Configure i915 Picture parameter Set registers during DSC
>     enabling
>   drm/i915/dp: Use the existing write_infoframe() for DSC PPS SDPs
>   drm/i915/dp: Populate DSC PPS SDP and send PPS infoframes
>   drm/i915/dp: Configure Display stream splitter registers during DSC
>     enable
>   drm/i915/dp: Disable DSC in source by disabling DSS CTL bits
>   drm/i915/dsc: Enable and disable appropriate power wells for VDSC
>   drm/i915/dsc: Add Per connector debugfs node for DSC support/enable
>   drm/i915/dsc: Force DSC enable if requested by IGT/userspace
> 
> Srivatsa, Anusha (2):
>   drm/dsc: Define Rate Control values that do not change over
>     configurations
>   drm/i915/icl: Add Display Stream Splitter control registers
> 
>  Documentation/gpu/drm-kms-helpers.rst   |   12 +
>  drivers/gpu/drm/Makefile                |    2 +-
>  drivers/gpu/drm/drm_dp_helper.c         |   90 ++
>  drivers/gpu/drm/drm_dsc.c               |  223 +++++
>  drivers/gpu/drm/i915/Makefile           |    3 +-
>  drivers/gpu/drm/i915/i915_debugfs.c     |   71 +-
>  drivers/gpu/drm/i915/i915_drv.h         |    5 +
>  drivers/gpu/drm/i915/i915_reg.h         |   35 +
>  drivers/gpu/drm/i915/intel_ddi.c        |    5 +
>  drivers/gpu/drm/i915/intel_display.c    |   39 +-
>  drivers/gpu/drm/i915/intel_display.h    |    4 +-
>  drivers/gpu/drm/i915/intel_dp.c         |  361 +++++++-
>  drivers/gpu/drm/i915/intel_dp_mst.c     |    2 +-
>  drivers/gpu/drm/i915/intel_drv.h        |   24 +
>  drivers/gpu/drm/i915/intel_hdmi.c       |   23 +-
>  drivers/gpu/drm/i915/intel_psr.c        |   16 +-
>  drivers/gpu/drm/i915/intel_runtime_pm.c |    4 +-
>  drivers/gpu/drm/i915/intel_vdsc.c       | 1103 +++++++++++++++++++++++
>  include/drm/drm_dp_helper.h             |   40 +
>  include/drm/drm_dsc.h                   |  491 ++++++++++
>  20 files changed, 2503 insertions(+), 50 deletions(-)
>  create mode 100644 drivers/gpu/drm/drm_dsc.c
>  create mode 100644 drivers/gpu/drm/i915/intel_vdsc.c
>  create mode 100644 include/drm/drm_dsc.h
> 
> -- 
> 2.18.0
> 
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