[PATCH v9 00/12] drm/i915: DP branch devices

[PATCH v9 00/12] drm/i915: DP branch devices

[Mika Kahola]

Prep work for DP branch device handling

This series of patches reads DPCD register 0x80h for receiver
capabilities for DP branch devices. The branch device types are
converters for the following standards

 - DP to VGA
 - DP to DVI
 - DP to HDMI
 - DP++ dual mode
 - Wireless WiGig
 
DPCD register defines max pixel rate for VGA dongles. This
check is carried out during mode validation. 

[1] git://github.com/mkahola/drm-intel-mika.git dp_branch_device

v2: DPCD register read outs moved to drm (Ville, Daniel)
v3: Max pixel rate computation moved to drm (Daniel)
v4: Use of drm_dp_helper routines to collect data (Ville)
v5: Remove duplicate code and unnecessary functions from drm_dp_helper (Ville)
v6: Rebase and i915_debugfs cleanup
v7: Structure cleanups and initial step to move DP debugging info to drm_dp_helpers
v8: Cleanups and TMDS clock frequency check for HDMI adapter
v9: Indentation fixes (Jim Bride)

Mika Kahola (12):
  drm: Add missing DP downstream port types
  drm: Drop VGA from bpc definitions
  drm: Helper to read max clock rate
  drm: Helper to read max bits per component
  drm: Read DP branch device id
  drm/i915: Cleanup DisplayPort AUX channel initialization
  drm/i915: Read DP branch device HW revision
  drm/i915: Read DP branch device SW revision
  drm/i915: Check pixel rate for DP to VGA dongle
  drm/i915: Update bits per component for display info
  drm: Add DP branch device info on debugfs
  drm/i915: Check TMDS clock DP to HDMI dongle

 drivers/gpu/drm/drm_dp_helper.c     | 172 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_debugfs.c |   3 +
 drivers/gpu/drm/i915/intel_dp.c     |  88 +++++++++++++++++-
 drivers/gpu/drm/i915/intel_drv.h    |   3 +
 drivers/gpu/drm/i915/intel_hdmi.c   |  27 ++++++
 include/drm/drm_dp_helper.h         |  22 +++--
 6 files changed, 306 insertions(+), 9 deletions(-)

-- 
2.7.4

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[PATCH v9 01/12] drm: Add missing DP downstream port types

[Mika Kahola]

Add missing DisplayPort downstream port types. The introduced
new port types are DP++ and Wireless.

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 include/drm/drm_dp_helper.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 63b8bd5..ba9731e 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -211,6 +211,8 @@
 # define DP_DS_PORT_TYPE_DVI		    2
 # define DP_DS_PORT_TYPE_HDMI		    3
 # define DP_DS_PORT_TYPE_NON_EDID	    4
+# define DP_DS_PORT_TYPE_DP_DUALMODE        5
+# define DP_DS_PORT_TYPE_WIRELESS           6
 # define DP_DS_PORT_HPD			    (1 << 3)
 /* offset 1 for VGA is maximum megapixels per second / 8 */
 /* offset 2 */
-- 
2.7.4

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[PATCH v9 02/12] drm: Drop VGA from bpc definitions

[Mika Kahola]

Drop "VGA" from bits per component definitions as these
are also used by other standards such as DVI, HDMI,
DP++.

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 include/drm/drm_dp_helper.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index ba9731e..0d84046 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -216,11 +216,11 @@
 # define DP_DS_PORT_HPD			    (1 << 3)
 /* offset 1 for VGA is maximum megapixels per second / 8 */
 /* offset 2 */
-# define DP_DS_VGA_MAX_BPC_MASK		    (3 << 0)
-# define DP_DS_VGA_8BPC			    0
-# define DP_DS_VGA_10BPC		    1
-# define DP_DS_VGA_12BPC		    2
-# define DP_DS_VGA_16BPC		    3
+# define DP_DS_MAX_BPC_MASK	            (3 << 0)
+# define DP_DS_8BPC		            0
+# define DP_DS_10BPC		            1
+# define DP_DS_12BPC		            2
+# define DP_DS_16BPC		            3
 
 /* link configuration */
 #define	DP_LINK_BW_SET		            0x100
-- 
2.7.4

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[PATCH v9 03/12] drm: Helper to read max clock rate

[Mika Kahola]

Helper routine to read out maximum supported pixel rate
for DisplayPort legay VGA converter or TMDS clock rate
for other digital legacy converters. The helper returns
clock rate in kHz.

v2: Return early if detailed port cap info is not available.
    Replace if-else ladder with switch-case (Ville)

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 33 +++++++++++++++++++++++++++++++++
 include/drm/drm_dp_helper.h     |  2 ++
 2 files changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 031c4d3..7497490 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -439,6 +439,39 @@ int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link)
 }
 EXPORT_SYMBOL(drm_dp_link_configure);
 
+/**
+ * drm_dp_downstream_max_clock() - extract branch device max
+ *                                 pixel rate for legacy VGA
+ *                                 converter or max TMDS clock
+ *                                 rate for others
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ *
+ * Returns max clock in kHz on success or 0 if max clock not defined
+ */
+int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+				const u8 port_cap[4])
+{
+	int type = port_cap[0] & DP_DS_PORT_TYPE_MASK;
+	bool detailed_cap_info = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+		DP_DETAILED_CAP_INFO_AVAILABLE;
+
+	if (!detailed_cap_info)
+		return 0;
+
+	switch (type) {
+	case DP_DS_PORT_TYPE_VGA:
+		return port_cap[1] * 8 * 1000;
+	case DP_DS_PORT_TYPE_DVI:
+	case DP_DS_PORT_TYPE_HDMI:
+	case DP_DS_PORT_TYPE_DP_DUALMODE:
+		return port_cap[1] * 2500;
+	default:
+		return 0;
+	}
+}
+EXPORT_SYMBOL(drm_dp_downstream_max_clock);
+
 /*
  * I2C-over-AUX implementation
  */
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 0d84046..60dd9dc 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -815,6 +815,8 @@ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link);
 int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link);
 int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link);
 int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link);
+int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+				const u8 port_cap[4]);
 
 void drm_dp_aux_init(struct drm_dp_aux *aux);
 int drm_dp_aux_register(struct drm_dp_aux *aux);
-- 
2.7.4

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[PATCH v9 04/12] drm: Helper to read max bits per component

[Mika Kahola]

Helper routine to read out maximum supported bits per
component for DisplayPort legay converters.

v2: Return early if detailed port cap info is not available.
    Replace if-else ladder with switch-case (Ville)

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 42 +++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_dp_helper.h     |  2 ++
 2 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 7497490..14e8ea0 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -472,6 +472,48 @@ int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
 }
 EXPORT_SYMBOL(drm_dp_downstream_max_clock);
 
+/**
+ * drm_dp_downstream_max_bpc() - extract branch device max
+ *                               bits per component
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ *
+ * Returns max bpc on success or 0 if max bpc not defined
+ */
+int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+			      const u8 port_cap[4])
+{
+	int type = port_cap[0] & DP_DS_PORT_TYPE_MASK;
+	bool detailed_cap_info = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+		DP_DETAILED_CAP_INFO_AVAILABLE;
+	int bpc;
+
+	if (!detailed_cap_info)
+		return 0;
+
+	switch (type) {
+	case DP_DS_PORT_TYPE_VGA:
+	case DP_DS_PORT_TYPE_DVI:
+	case DP_DS_PORT_TYPE_HDMI:
+	case DP_DS_PORT_TYPE_DP_DUALMODE:
+		bpc = port_cap[2] & DP_DS_MAX_BPC_MASK;
+
+		switch (bpc) {
+		case DP_DS_8BPC:
+			return 8;
+		case DP_DS_10BPC:
+			return 10;
+		case DP_DS_12BPC:
+			return 12;
+		case DP_DS_16BPC:
+			return 16;
+		}
+	default:
+		return 0;
+	}
+}
+EXPORT_SYMBOL(drm_dp_downstream_max_bpc);
+
 /*
  * I2C-over-AUX implementation
  */
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 60dd9dc..f3d1424 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -817,6 +817,8 @@ int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link);
 int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link);
 int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
 				const u8 port_cap[4]);
+int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+			      const u8 port_cap[4]);
 
 void drm_dp_aux_init(struct drm_dp_aux *aux);
 int drm_dp_aux_register(struct drm_dp_aux *aux);
-- 
2.7.4

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[PATCH v9 05/12] drm: Read DP branch device id

[Mika Kahola]

Read DisplayPort branch device id string.

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 12 ++++++++++++
 include/drm/drm_dp_helper.h     |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 14e8ea0..01ee7af 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -514,6 +514,18 @@ int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
 }
 EXPORT_SYMBOL(drm_dp_downstream_max_bpc);
 
+/**
+ * drm_dp_downstream_id() - identify branch device
+ * @aux: DisplayPort AUX channel
+ *
+ * Returns branch device id on success or NULL on failure
+ */
+int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6])
+{
+	return drm_dp_dpcd_read(aux, DP_BRANCH_ID, id, 6);
+}
+EXPORT_SYMBOL(drm_dp_downstream_id);
+
 /*
  * I2C-over-AUX implementation
  */
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index f3d1424..faea76b 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -445,6 +445,7 @@
 #define DP_SOURCE_OUI			    0x300
 #define DP_SINK_OUI			    0x400
 #define DP_BRANCH_OUI			    0x500
+#define DP_BRANCH_ID                        0x503
 
 #define DP_SET_POWER                        0x600
 # define DP_SET_POWER_D0                    0x1
@@ -819,6 +820,7 @@ int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
 				const u8 port_cap[4]);
 int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
 			      const u8 port_cap[4]);
+int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]);
 
 void drm_dp_aux_init(struct drm_dp_aux *aux);
 int drm_dp_aux_register(struct drm_dp_aux *aux);
-- 
2.7.4

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[PATCH v9 06/12] drm/i915: Cleanup DisplayPort AUX channel initialization

[Mika Kahola]

Let's remove reference to "struct intel_connector *connector"
in intel_dp_aux_init() function as it is no longer required.

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 75ac62f..c69ad13 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1243,7 +1243,7 @@ intel_dp_aux_fini(struct intel_dp *intel_dp)
 }
 
 static void
-intel_dp_aux_init(struct intel_dp *intel_dp, struct intel_connector *connector)
+intel_dp_aux_init(struct intel_dp *intel_dp)
 {
 	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 	enum port port = intel_dig_port->port;
@@ -5624,7 +5624,7 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
 	connector->interlace_allowed = true;
 	connector->doublescan_allowed = 0;
 
-	intel_dp_aux_init(intel_dp, intel_connector);
+	intel_dp_aux_init(intel_dp);
 
 	INIT_DELAYED_WORK(&intel_dp->panel_vdd_work,
 			  edp_panel_vdd_work);
-- 
2.7.4

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[PATCH v9 07/12] drm/i915: Read DP branch device HW revision

[Mika Kahola]

HW revision is mandatory field for DisplayPort branch
devices. This is defined in DPCD register field 0x509.

v2: move drm_dp_ds_revision structure to be part of
    drm_dp_link structure (Daniel)
v3: remove dependency to drm_dp_helper but instead parse
    DPCD and print HW revision info to dmesg (Ville)

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 21 +++++++++++++++++++++
 include/drm/drm_dp_helper.h     |  1 +
 2 files changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index c69ad13..bb0417c 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1419,6 +1419,25 @@ static void intel_dp_print_rates(struct intel_dp *intel_dp)
 	DRM_DEBUG_KMS("common rates: %s\n", str);
 }
 
+static void intel_dp_print_hw_revision(struct intel_dp *intel_dp)
+{
+	uint8_t rev;
+	int len;
+
+	if ((drm_debug & DRM_UT_KMS) == 0)
+		return;
+
+	if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+	      DP_DWN_STRM_PORT_PRESENT))
+		return;
+
+	len = drm_dp_dpcd_read(&intel_dp->aux, DP_BRANCH_HW_REV, &rev, 1);
+	if (len < 0)
+		return;
+
+	DRM_DEBUG_KMS("sink hw revision: %d.%d\n", (rev & 0xf0) >> 4, rev & 0xf);
+}
+
 static int rate_to_index(int find, const int *rates)
 {
 	int i = 0;
@@ -4312,6 +4331,8 @@ intel_dp_long_pulse(struct intel_connector *intel_connector)
 
 	intel_dp_probe_oui(intel_dp);
 
+	intel_dp_print_hw_revision(intel_dp);
+
 	intel_dp_configure_mst(intel_dp);
 
 	if (intel_dp->is_mst) {
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index faea76b..19ac599 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -446,6 +446,7 @@
 #define DP_SINK_OUI			    0x400
 #define DP_BRANCH_OUI			    0x500
 #define DP_BRANCH_ID                        0x503
+#define DP_BRANCH_HW_REV                    0x509
 
 #define DP_SET_POWER                        0x600
 # define DP_SET_POWER_D0                    0x1
-- 
2.7.4

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[PATCH v9 08/12] drm/i915: Read DP branch device SW revision

[Mika Kahola]

SW revision is mandatory field for DisplayPort branch
devices. This is defined in DPCD register fields 0x50A
and 0x50B.

v2: move drm_dp_ds_revision structure to be part of
    drm_dp_link structure (Daniel)
v3: remove dependency to drm_dp_helper but instead parse
    DPCD and print SW revision info to dmesg (Ville)
v4: commit message fix (Jim Bride)

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 20 ++++++++++++++++++++
 include/drm/drm_dp_helper.h     |  1 +
 2 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index bb0417c..7428c72 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1438,6 +1438,25 @@ static void intel_dp_print_hw_revision(struct intel_dp *intel_dp)
 	DRM_DEBUG_KMS("sink hw revision: %d.%d\n", (rev & 0xf0) >> 4, rev & 0xf);
 }
 
+static void intel_dp_print_sw_revision(struct intel_dp *intel_dp)
+{
+	uint8_t rev[2];
+	int len;
+
+	if ((drm_debug & DRM_UT_KMS) == 0)
+		return;
+
+	if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+	      DP_DWN_STRM_PORT_PRESENT))
+		return;
+
+	len = drm_dp_dpcd_read(&intel_dp->aux, DP_BRANCH_SW_REV, &rev, 2);
+	if (len < 0)
+		return;
+
+	DRM_DEBUG_KMS("sink sw revision: %d.%d\n", rev[0], rev[1]);
+}
+
 static int rate_to_index(int find, const int *rates)
 {
 	int i = 0;
@@ -4332,6 +4351,7 @@ intel_dp_long_pulse(struct intel_connector *intel_connector)
 	intel_dp_probe_oui(intel_dp);
 
 	intel_dp_print_hw_revision(intel_dp);
+	intel_dp_print_sw_revision(intel_dp);
 
 	intel_dp_configure_mst(intel_dp);
 
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 19ac599..215202f 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -447,6 +447,7 @@
 #define DP_BRANCH_OUI			    0x500
 #define DP_BRANCH_ID                        0x503
 #define DP_BRANCH_HW_REV                    0x509
+#define DP_BRANCH_SW_REV                    0x50A
 
 #define DP_SET_POWER                        0x600
 # define DP_SET_POWER_D0                    0x1
-- 
2.7.4

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[PATCH v9 09/12] drm/i915: Check pixel rate for DP to VGA dongle

[Mika Kahola]

Filter out a mode that exceeds the max pixel rate setting
for DP to VGA dongle. This is defined in DPCD register 0x81
if detailed cap info i.e. info field is 4 bytes long and
it is available for DP downstream port.

The register defines the pixel rate divided by 8 in MP/s.

v2: DPCD read outs and computation moved to drm (Ville, Daniel)
v3: Sink pixel rate computation moved to drm_dp_max_sink_dotclock()
    function (Daniel)
v4: Use of drm_dp_helper.c routines to compute max pixel clock (Ville)
v5: Use of intel_dp->downstream_ports to read out port capabilities.
    Code restructuring (Ville)
v6: Move DP branch device check to drm_dp_helper.c (Daniel)
v7: Cleanup as suggested by Ville

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 7428c72..8f17c88 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -190,6 +190,29 @@ intel_dp_max_data_rate(int max_link_clock, int max_lanes)
 	return (max_link_clock * max_lanes * 8) / 10;
 }
 
+static int
+intel_dp_downstream_max_dotclock(struct intel_dp *intel_dp)
+{
+	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+	struct intel_encoder *encoder = &intel_dig_port->base;
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	int max_dotclk = dev_priv->max_dotclk_freq;
+	int ds_max_dotclk;
+
+	int type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK;
+
+	if (type != DP_DS_PORT_TYPE_VGA)
+		return max_dotclk;
+
+	ds_max_dotclk = drm_dp_downstream_max_clock(intel_dp->dpcd,
+						    intel_dp->downstream_ports);
+
+	if (ds_max_dotclk != 0)
+		max_dotclk = min(max_dotclk, ds_max_dotclk);
+
+	return max_dotclk;
+}
+
 static enum drm_mode_status
 intel_dp_mode_valid(struct drm_connector *connector,
 		    struct drm_display_mode *mode)
@@ -199,7 +222,9 @@ intel_dp_mode_valid(struct drm_connector *connector,
 	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 	int target_clock = mode->clock;
 	int max_rate, mode_rate, max_lanes, max_link_clock;
-	int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
+	int max_dotclk;
+
+	max_dotclk = intel_dp_downstream_max_dotclock(intel_dp);
 
 	if (is_edp(intel_dp) && fixed_mode) {
 		if (mode->hdisplay > fixed_mode->hdisplay)
-- 
2.7.4

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[PATCH v9 10/12] drm/i915: Update bits per component for display info

[Mika Kahola]

DisplayPort branch device may define max supported bits per
component. Update display info based on this value if bpc
is defined.

v2: cleanup to match the drm_dp_helper.c patches introduced
    earlier in this series
v3: Fill bpc for connector's display info in separate
    drm_dp_helper function (Daniel)
v4: remove updating bpc for display info as it may be overridden
    when parsing EDID. Instead, check bpc for DP branch device
    during compute_config
v5: Indentation fixes (Jim Bride)

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 8f17c88..69cee9b 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1524,6 +1524,20 @@ void intel_dp_compute_rate(struct intel_dp *intel_dp, int port_clock,
 	}
 }
 
+int intel_dp_compute_bpp(struct intel_dp *intel_dp,
+			 struct intel_crtc_state *pipe_config)
+{
+	int bpp, bpc;
+
+	bpp = pipe_config->pipe_bpp;
+	bpc = drm_dp_downstream_max_bpc(intel_dp->dpcd, intel_dp->downstream_ports);
+
+	if (bpc > 0)
+		bpp = min(bpp, 3*bpc);
+
+	return bpp;
+}
+
 bool
 intel_dp_compute_config(struct intel_encoder *encoder,
 			struct intel_crtc_state *pipe_config,
@@ -1590,7 +1604,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 
 	/* Walk through all bpp values. Luckily they're all nicely spaced with 2
 	 * bpc in between. */
-	bpp = pipe_config->pipe_bpp;
+	bpp = intel_dp_compute_bpp(intel_dp, pipe_config);
 	if (is_edp(intel_dp)) {
 
 		/* Get bpp from vbt only for panels that dont have bpp in edid */
-- 
2.7.4

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[PATCH v9 11/12] drm: Add DP branch device info on debugfs

[Mika Kahola]

Read DisplayPort branch device info from through debugfs
interface.

v2: use drm_dp_helper routines to collect data
v3: cleanup to match the drm_dp_helper.c patches introduced
    earlier in this series
v4: move DP branch device info to function 'intel_dp_branch_device_info()'
v5: initial step to move debugging info from intel_dp. to drm_dp_helper.c (Daniel)
v6: read hw and sw revision without using specific drm_dp_helper routines
v7: indentation fixes (Jim Bride)

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 drivers/gpu/drm/drm_dp_helper.c     | 85 +++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_debugfs.c |  3 ++
 include/drm/drm_dp_helper.h         |  2 +
 3 files changed, 90 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 01ee7af..a536514 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -526,6 +526,91 @@ int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6])
 }
 EXPORT_SYMBOL(drm_dp_downstream_id);
 
+/**
+ * drm_dp_downstream_debug() - debug DP branch devices
+ * @m: pointer for debugfs file
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ * @aux: DisplayPort AUX channel
+ *
+ */
+void drm_dp_downstream_debug(struct seq_file *m,
+			     const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+			     const u8 port_cap[4], struct drm_dp_aux *aux)
+{
+	bool detailed_cap_info = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+				 DP_DETAILED_CAP_INFO_AVAILABLE;
+	int clk;
+	int bpc;
+	char id[6];
+	int len;
+	uint8_t rev[2];
+	int type = port_cap[0] & DP_DS_PORT_TYPE_MASK;
+	bool branch_device = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+			     DP_DWN_STRM_PORT_PRESENT;
+
+	seq_printf(m, "\tDP branch device present: %s\n",
+		   branch_device ? "yes" : "no");
+
+	if (!branch_device)
+		return;
+
+	switch (type) {
+	case DP_DS_PORT_TYPE_DP:
+		seq_puts(m, "\t\tType: DisplayPort\n");
+		break;
+	case DP_DS_PORT_TYPE_VGA:
+		seq_puts(m, "\t\tType: VGA\n");
+		break;
+	case DP_DS_PORT_TYPE_DVI:
+		seq_puts(m, "\t\tType: DVI\n");
+		break;
+	case DP_DS_PORT_TYPE_HDMI:
+		seq_puts(m, "\t\tType: HDMI\n");
+		break;
+	case DP_DS_PORT_TYPE_NON_EDID:
+		seq_puts(m, "\t\tType: others without EDID support\n");
+		break;
+	case DP_DS_PORT_TYPE_DP_DUALMODE:
+		seq_puts(m, "\t\tType: DP++\n");
+		break;
+	case DP_DS_PORT_TYPE_WIRELESS:
+		seq_puts(m, "\t\tType: Wireless\n");
+		break;
+	default:
+		seq_puts(m, "\t\tType: N/A\n");
+	}
+
+	drm_dp_downstream_id(aux, id);
+	seq_printf(m, "\t\tID: %s\n", id);
+
+	len = drm_dp_dpcd_read(aux, DP_BRANCH_HW_REV, &rev[0], 1);
+	if (len > 0)
+		seq_printf(m, "\t\tHW: %d.%d\n",
+			   (rev[0] & 0xf0) >> 4, rev[0] & 0xf);
+
+	len = drm_dp_dpcd_read(aux, DP_BRANCH_SW_REV, &rev, 2);
+	if (len > 0)
+		seq_printf(m, "\t\tSW: %d.%d\n", rev[0], rev[1]);
+
+	if (detailed_cap_info) {
+		clk = drm_dp_downstream_max_clock(dpcd, port_cap);
+
+		if (clk > 0) {
+			if (type == DP_DS_PORT_TYPE_VGA)
+				seq_printf(m, "\t\tMax dot clock: %d kHz\n", clk);
+			else
+				seq_printf(m, "\t\tMax TMDS clock: %d kHz\n", clk);
+		}
+
+		bpc = drm_dp_downstream_max_bpc(dpcd, port_cap);
+
+		if (bpc > 0)
+			seq_printf(m, "\t\tMax bpc: %d\n", bpc);
+	}
+}
+EXPORT_SYMBOL(drm_dp_downstream_debug);
+
 /*
  * I2C-over-AUX implementation
  */
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 02b627e..44fab14 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2851,6 +2851,9 @@ static void intel_dp_info(struct seq_file *m,
 	seq_printf(m, "\taudio support: %s\n", yesno(intel_dp->has_audio));
 	if (intel_connector->base.connector_type == DRM_MODE_CONNECTOR_eDP)
 		intel_panel_info(m, &intel_connector->panel);
+
+	drm_dp_downstream_debug(m, intel_dp->dpcd, intel_dp->downstream_ports,
+				&intel_dp->aux);
 }
 
 static void intel_hdmi_info(struct seq_file *m,
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 215202f..2a79882 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -823,6 +823,8 @@ int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
 int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
 			      const u8 port_cap[4]);
 int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]);
+void drm_dp_downstream_debug(struct seq_file *m, const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+			     const u8 port_cap[4], struct drm_dp_aux *aux);
 
 void drm_dp_aux_init(struct drm_dp_aux *aux);
 int drm_dp_aux_register(struct drm_dp_aux *aux);
-- 
2.7.4

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[PATCH v9 12/12] drm/i915: Check TMDS clock DP to HDMI dongle

[Mika Kahola]

Respect max TMDS clock frequency from DPCD for active
DP to HDMI adapters.

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h  |  3 +++
 drivers/gpu/drm/i915/intel_hdmi.c | 27 +++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 7868d5c..16374a1 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -823,6 +823,9 @@ struct intel_hdmi {
 	i915_reg_t hdmi_reg;
 	int ddc_bus;
 	struct {
+		int max_tmds_clock;
+	} dp_to_hdmi;
+	struct {
 		enum drm_dp_dual_mode_type type;
 		int max_tmds_clock;
 	} dp_dual_mode;
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index c51073f..1066114 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1220,6 +1220,9 @@ static int hdmi_port_clock_limit(struct intel_hdmi *hdmi,
 	int max_tmds_clock = intel_hdmi_source_max_tmds_clock(to_i915(dev));
 
 	if (respect_downstream_limits) {
+		if (hdmi->dp_to_hdmi.max_tmds_clock)
+			max_tmds_clock = min(max_tmds_clock,
+					     hdmi->dp_to_hdmi.max_tmds_clock);
 		if (hdmi->dp_dual_mode.max_tmds_clock)
 			max_tmds_clock = min(max_tmds_clock,
 					     hdmi->dp_dual_mode.max_tmds_clock);
@@ -1390,11 +1393,33 @@ intel_hdmi_unset_edid(struct drm_connector *connector)
 	intel_hdmi->dp_dual_mode.type = DRM_DP_DUAL_MODE_NONE;
 	intel_hdmi->dp_dual_mode.max_tmds_clock = 0;
 
+	intel_hdmi->dp_to_hdmi.max_tmds_clock = 0;
+
 	kfree(to_intel_connector(connector)->detect_edid);
 	to_intel_connector(connector)->detect_edid = NULL;
 }
 
 static void
+intel_hdmi_dp_adapter_detect(struct drm_connector *connector)
+{
+	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
+	struct intel_digital_port *intel_dig_port =
+		hdmi_to_dig_port(intel_hdmi);
+	struct intel_dp *intel_dp = &intel_dig_port->dp;
+	int type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK;
+
+	if (type != DP_DS_PORT_TYPE_HDMI)
+		return;
+
+	intel_hdmi->dp_to_hdmi.max_tmds_clock =
+		drm_dp_downstream_max_clock(intel_dp->dpcd,
+					    intel_dp->downstream_ports);
+
+	DRM_DEBUG_KMS("DP HDMI adaptor detected (max TMDS clock : %d kHz\n",
+		      intel_hdmi->dp_to_hdmi.max_tmds_clock);
+}
+
+static void
 intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector, bool has_edid)
 {
 	struct drm_i915_private *dev_priv = to_i915(connector->dev);
@@ -1454,6 +1479,8 @@ intel_hdmi_set_edid(struct drm_connector *connector)
 
 	intel_hdmi_dp_dual_mode_detect(connector, edid != NULL);
 
+	intel_hdmi_dp_adapter_detect(connector);
+
 	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
 
 	to_intel_connector(connector)->detect_edid = edid;
-- 
2.7.4

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✓ Fi.CI.BAT: success for drm/i915: DP branch devices (rev10)

[Patchwork]

== Series Details ==

Series: drm/i915: DP branch devices (rev10)
URL   : https://patchwork.freedesktop.org/series/6658/
State : success

== Summary ==

Series 6658v10 drm/i915: DP branch devices
http://patchwork.freedesktop.org/api/1.0/series/6658/revisions/10/mbox/

Test drv_module_reload_basic:
                skip       -> PASS       (fi-skl-6260u)

fi-bdw-5557u     total:254  pass:238  dwarn:0   dfail:0   fail:1   skip:15 
fi-bsw-n3050     total:254  pass:207  dwarn:0   dfail:0   fail:1   skip:46 
fi-byt-n2820     total:254  pass:211  dwarn:0   dfail:0   fail:2   skip:41 
fi-hsw-4770k     total:254  pass:231  dwarn:0   dfail:0   fail:1   skip:22 
fi-hsw-4770r     total:254  pass:227  dwarn:0   dfail:0   fail:1   skip:26 
fi-ilk-650       total:254  pass:183  dwarn:0   dfail:0   fail:3   skip:68 
fi-ivb-3520m     total:254  pass:222  dwarn:0   dfail:0   fail:1   skip:31 
fi-ivb-3770      total:254  pass:222  dwarn:0   dfail:0   fail:1   skip:31 
fi-skl-6260u     total:254  pass:239  dwarn:0   dfail:0   fail:1   skip:14 
fi-skl-6700hq    total:254  pass:226  dwarn:0   dfail:0   fail:2   skip:26 
fi-skl-6700k     total:254  pass:224  dwarn:1   dfail:0   fail:1   skip:28 
fi-snb-2520m     total:254  pass:208  dwarn:0   dfail:0   fail:1   skip:45 
fi-snb-2600      total:254  pass:208  dwarn:0   dfail:0   fail:1   skip:45 

Results at /archive/results/CI_IGT_test/Patchwork_2500/

5986f290e25f42d3d5df390411cc43683deb1301 drm-intel-nightly: 2016y-09m-08d-09h-11m-50s UTC integration manifest
80c523f drm/i915: Check TMDS clock DP to HDMI dongle
e3882c5 drm: Add DP branch device info on debugfs
63d1119 drm/i915: Update bits per component for display info
611f82d drm/i915: Check pixel rate for DP to VGA dongle
8f0a006 drm/i915: Read DP branch device SW revision
7d16992 drm/i915: Read DP branch device HW revision
de61c62 drm/i915: Cleanup DisplayPort AUX channel initialization
79e778d drm: Read DP branch device id
16ba6e9 drm: Helper to read max bits per component
c0d1c8a drm: Helper to read max clock rate
88545b2 drm: Drop VGA from bpc definitions
875fc5e drm: Add missing DP downstream port types

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Re: [PATCH v9 08/12] drm/i915: Read DP branch device SW revision

[Jim Bride]

On Fri, Sep 09, 2016 at 02:10:54PM +0300, Mika Kahola wrote:
> SW revision is mandatory field for DisplayPort branch
> devices. This is defined in DPCD register fields 0x50A
> and 0x50B.
> 
> v2: move drm_dp_ds_revision structure to be part of
>     drm_dp_link structure (Daniel)
> v3: remove dependency to drm_dp_helper but instead parse
>     DPCD and print SW revision info to dmesg (Ville)
> v4: commit message fix (Jim Bride)
> 
> Signed-off-by: Mika Kahola <mika.kahola@intel.com>

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>

> ---
>  drivers/gpu/drm/i915/intel_dp.c | 20 ++++++++++++++++++++
>  include/drm/drm_dp_helper.h     |  1 +
>  2 files changed, 21 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index bb0417c..7428c72 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1438,6 +1438,25 @@ static void intel_dp_print_hw_revision(struct intel_dp *intel_dp)
>  	DRM_DEBUG_KMS("sink hw revision: %d.%d\n", (rev & 0xf0) >> 4, rev & 0xf);
>  }
>  
> +static void intel_dp_print_sw_revision(struct intel_dp *intel_dp)
> +{
> +	uint8_t rev[2];
> +	int len;
> +
> +	if ((drm_debug & DRM_UT_KMS) == 0)
> +		return;
> +
> +	if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
> +	      DP_DWN_STRM_PORT_PRESENT))
> +		return;
> +
> +	len = drm_dp_dpcd_read(&intel_dp->aux, DP_BRANCH_SW_REV, &rev, 2);
> +	if (len < 0)
> +		return;
> +
> +	DRM_DEBUG_KMS("sink sw revision: %d.%d\n", rev[0], rev[1]);
> +}
> +
>  static int rate_to_index(int find, const int *rates)
>  {
>  	int i = 0;
> @@ -4332,6 +4351,7 @@ intel_dp_long_pulse(struct intel_connector *intel_connector)
>  	intel_dp_probe_oui(intel_dp);
>  
>  	intel_dp_print_hw_revision(intel_dp);
> +	intel_dp_print_sw_revision(intel_dp);
>  
>  	intel_dp_configure_mst(intel_dp);
>  
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 19ac599..215202f 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -447,6 +447,7 @@
>  #define DP_BRANCH_OUI			    0x500
>  #define DP_BRANCH_ID                        0x503
>  #define DP_BRANCH_HW_REV                    0x509
> +#define DP_BRANCH_SW_REV                    0x50A
>  
>  #define DP_SET_POWER                        0x600
>  # define DP_SET_POWER_D0                    0x1
> -- 
> 2.7.4
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Re: [PATCH v9 10/12] drm/i915: Update bits per component for display info

[Jim Bride]

On Fri, Sep 09, 2016 at 02:10:56PM +0300, Mika Kahola wrote:
> DisplayPort branch device may define max supported bits per
> component. Update display info based on this value if bpc
> is defined.
> 
> v2: cleanup to match the drm_dp_helper.c patches introduced
>     earlier in this series
> v3: Fill bpc for connector's display info in separate
>     drm_dp_helper function (Daniel)
> v4: remove updating bpc for display info as it may be overridden
>     when parsing EDID. Instead, check bpc for DP branch device
>     during compute_config
> v5: Indentation fixes (Jim Bride)
> 
> Signed-off-by: Mika Kahola <mika.kahola@intel.com>

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>

> ---
>  drivers/gpu/drm/i915/intel_dp.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 8f17c88..69cee9b 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1524,6 +1524,20 @@ void intel_dp_compute_rate(struct intel_dp *intel_dp, int port_clock,
>  	}
>  }
>  
> +int intel_dp_compute_bpp(struct intel_dp *intel_dp,
> +			 struct intel_crtc_state *pipe_config)
> +{
> +	int bpp, bpc;
> +
> +	bpp = pipe_config->pipe_bpp;
> +	bpc = drm_dp_downstream_max_bpc(intel_dp->dpcd, intel_dp->downstream_ports);
> +
> +	if (bpc > 0)
> +		bpp = min(bpp, 3*bpc);
> +
> +	return bpp;
> +}
> +
>  bool
>  intel_dp_compute_config(struct intel_encoder *encoder,
>  			struct intel_crtc_state *pipe_config,
> @@ -1590,7 +1604,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>  
>  	/* Walk through all bpp values. Luckily they're all nicely spaced with 2
>  	 * bpc in between. */
> -	bpp = pipe_config->pipe_bpp;
> +	bpp = intel_dp_compute_bpp(intel_dp, pipe_config);
>  	if (is_edp(intel_dp)) {
>  
>  		/* Get bpp from vbt only for panels that dont have bpp in edid */
> -- 
> 2.7.4
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Re: [PATCH v9 11/12] drm: Add DP branch device info on debugfs

[Jim Bride]

On Fri, Sep 09, 2016 at 02:10:57PM +0300, Mika Kahola wrote:
> Read DisplayPort branch device info from through debugfs
> interface.
> 
> v2: use drm_dp_helper routines to collect data
> v3: cleanup to match the drm_dp_helper.c patches introduced
>     earlier in this series
> v4: move DP branch device info to function 'intel_dp_branch_device_info()'
> v5: initial step to move debugging info from intel_dp. to drm_dp_helper.c (Daniel)
> v6: read hw and sw revision without using specific drm_dp_helper routines
> v7: indentation fixes (Jim Bride)
> 
> Signed-off-by: Mika Kahola <mika.kahola@intel.com>

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>

> ---
>  drivers/gpu/drm/drm_dp_helper.c     | 85 +++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/i915_debugfs.c |  3 ++
>  include/drm/drm_dp_helper.h         |  2 +
>  3 files changed, 90 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index 01ee7af..a536514 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -526,6 +526,91 @@ int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6])
>  }
>  EXPORT_SYMBOL(drm_dp_downstream_id);
>  
> +/**
> + * drm_dp_downstream_debug() - debug DP branch devices
> + * @m: pointer for debugfs file
> + * @dpcd: DisplayPort configuration data
> + * @port_cap: port capabilities
> + * @aux: DisplayPort AUX channel
> + *
> + */
> +void drm_dp_downstream_debug(struct seq_file *m,
> +			     const u8 dpcd[DP_RECEIVER_CAP_SIZE],
> +			     const u8 port_cap[4], struct drm_dp_aux *aux)
> +{
> +	bool detailed_cap_info = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
> +				 DP_DETAILED_CAP_INFO_AVAILABLE;
> +	int clk;
> +	int bpc;
> +	char id[6];
> +	int len;
> +	uint8_t rev[2];
> +	int type = port_cap[0] & DP_DS_PORT_TYPE_MASK;
> +	bool branch_device = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
> +			     DP_DWN_STRM_PORT_PRESENT;
> +
> +	seq_printf(m, "\tDP branch device present: %s\n",
> +		   branch_device ? "yes" : "no");
> +
> +	if (!branch_device)
> +		return;
> +
> +	switch (type) {
> +	case DP_DS_PORT_TYPE_DP:
> +		seq_puts(m, "\t\tType: DisplayPort\n");
> +		break;
> +	case DP_DS_PORT_TYPE_VGA:
> +		seq_puts(m, "\t\tType: VGA\n");
> +		break;
> +	case DP_DS_PORT_TYPE_DVI:
> +		seq_puts(m, "\t\tType: DVI\n");
> +		break;
> +	case DP_DS_PORT_TYPE_HDMI:
> +		seq_puts(m, "\t\tType: HDMI\n");
> +		break;
> +	case DP_DS_PORT_TYPE_NON_EDID:
> +		seq_puts(m, "\t\tType: others without EDID support\n");
> +		break;
> +	case DP_DS_PORT_TYPE_DP_DUALMODE:
> +		seq_puts(m, "\t\tType: DP++\n");
> +		break;
> +	case DP_DS_PORT_TYPE_WIRELESS:
> +		seq_puts(m, "\t\tType: Wireless\n");
> +		break;
> +	default:
> +		seq_puts(m, "\t\tType: N/A\n");
> +	}
> +
> +	drm_dp_downstream_id(aux, id);
> +	seq_printf(m, "\t\tID: %s\n", id);
> +
> +	len = drm_dp_dpcd_read(aux, DP_BRANCH_HW_REV, &rev[0], 1);
> +	if (len > 0)
> +		seq_printf(m, "\t\tHW: %d.%d\n",
> +			   (rev[0] & 0xf0) >> 4, rev[0] & 0xf);
> +
> +	len = drm_dp_dpcd_read(aux, DP_BRANCH_SW_REV, &rev, 2);
> +	if (len > 0)
> +		seq_printf(m, "\t\tSW: %d.%d\n", rev[0], rev[1]);
> +
> +	if (detailed_cap_info) {
> +		clk = drm_dp_downstream_max_clock(dpcd, port_cap);
> +
> +		if (clk > 0) {
> +			if (type == DP_DS_PORT_TYPE_VGA)
> +				seq_printf(m, "\t\tMax dot clock: %d kHz\n", clk);
> +			else
> +				seq_printf(m, "\t\tMax TMDS clock: %d kHz\n", clk);
> +		}
> +
> +		bpc = drm_dp_downstream_max_bpc(dpcd, port_cap);
> +
> +		if (bpc > 0)
> +			seq_printf(m, "\t\tMax bpc: %d\n", bpc);
> +	}
> +}
> +EXPORT_SYMBOL(drm_dp_downstream_debug);
> +
>  /*
>   * I2C-over-AUX implementation
>   */
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 02b627e..44fab14 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2851,6 +2851,9 @@ static void intel_dp_info(struct seq_file *m,
>  	seq_printf(m, "\taudio support: %s\n", yesno(intel_dp->has_audio));
>  	if (intel_connector->base.connector_type == DRM_MODE_CONNECTOR_eDP)
>  		intel_panel_info(m, &intel_connector->panel);
> +
> +	drm_dp_downstream_debug(m, intel_dp->dpcd, intel_dp->downstream_ports,
> +				&intel_dp->aux);
>  }
>  
>  static void intel_hdmi_info(struct seq_file *m,
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 215202f..2a79882 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -823,6 +823,8 @@ int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
>  int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
>  			      const u8 port_cap[4]);
>  int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]);
> +void drm_dp_downstream_debug(struct seq_file *m, const u8 dpcd[DP_RECEIVER_CAP_SIZE],
> +			     const u8 port_cap[4], struct drm_dp_aux *aux);
>  
>  void drm_dp_aux_init(struct drm_dp_aux *aux);
>  int drm_dp_aux_register(struct drm_dp_aux *aux);
> -- 
> 2.7.4
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Re: [Intel-gfx] [PATCH v9 00/12] drm/i915: DP branch devices

[Jani Nikula]

On Fri, 09 Sep 2016, Mika Kahola <mika.kahola@intel.com> wrote:
> Prep work for DP branch device handling
>
> This series of patches reads DPCD register 0x80h for receiver
> capabilities for DP branch devices. The branch device types are
> converters for the following standards
>
>  - DP to VGA
>  - DP to DVI
>  - DP to HDMI
>  - DP++ dual mode
>  - Wireless WiGig
>  
> DPCD register defines max pixel rate for VGA dongles. This
> check is carried out during mode validation. 

Pushed all except the last patch to drm-intel-next-queued, with Dave's
IRC ack on queuing the drm patches through the Intel tree.

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Technology Center
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