[Intel-gfx] [PATCH] drm/i915/display/psr: Configure and Program IO buffer Wake and Fast Wake

[Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>]

As per b.spec 49274, the IO buffer Wake lines and Fast Wake lines can be
calculated based on the following formula.

 IO buffer wake lines = ROUNDUP(PSR2 IO wake time / total line time in microseconds)
 Fast wake lines = ROUNDUP(PSR2 aux transaction time / total line time in microseconds)
 For both fields limit the minimum to 7 lines and maximum to 12 lines
 PSR2 IO wake time = 50us, PSR2 aux transaction time = 32us.

It calculates IO buffer Wake and Fast Wake based on b.spec 49274 and
programs it.

v2: Address Jose's review comment.
 - Do not overwrite the values.
 - Move calulating and validating of io_buffer_wake/fast_wake to
    intel_psr2_config_valid() from intel_psr_compute_config()
 - Add macros for hardcoded values.
 - Simplify and reuse the validating the io_buffer_wake/fast_wake.

v3: Rebased

Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Lee Shawn C <shawn.c.lee@intel.com>
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
---
 .../drm/i915/display/intel_display_types.h    |  2 +
 drivers/gpu/drm/i915/display/intel_psr.c      | 65 +++++++++++++++----
 drivers/gpu/drm/i915/i915_reg.h               |  8 +++
 3 files changed, 63 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index e2e707c4dff5..79df8da9b89e 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1496,6 +1496,8 @@ struct intel_psr {
 	u16 su_x_granularity;
 	bool dc3co_enabled;
 	u32 dc3co_exit_delay;
+	u32 io_buffer_wake;
+	u32 fast_wake;
 	struct delayed_work dc3co_work;
 	struct drm_dp_vsc_sdp vsc;
 };
diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 54ad5c378355..a1fff724fb67 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -531,19 +531,15 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
 	val |= intel_psr2_get_tp_time(intel_dp);
 
 	if (DISPLAY_VER(dev_priv) >= 12) {
-		/*
-		 * TODO: 7 lines of IO_BUFFER_WAKE and FAST_WAKE are default
-		 * values from BSpec. In order to setting an optimal power
-		 * consumption, lower than 4k resoluition mode needs to decrese
-		 * IO_BUFFER_WAKE and FAST_WAKE. And higher than 4K resolution
-		 * mode needs to increase IO_BUFFER_WAKE and FAST_WAKE.
-		 */
-		val |= TGL_EDP_PSR2_BLOCK_COUNT_NUM_2;
-		val |= TGL_EDP_PSR2_IO_BUFFER_WAKE(7);
-		val |= TGL_EDP_PSR2_FAST_WAKE(7);
+		if (intel_dp->psr.io_buffer_wake < 9 || intel_dp->psr.fast_wake < 9)
+			val |= TGL_EDP_PSR2_BLOCK_COUNT_NUM_2;
+		else
+			val |= TGL_EDP_PSR2_BLOCK_COUNT_NUM_3;
+		val |= TGL_EDP_PSR2_IO_BUFFER_WAKE(intel_dp->psr.io_buffer_wake);
+		val |= TGL_EDP_PSR2_FAST_WAKE(intel_dp->psr.fast_wake);
 	} else if (DISPLAY_VER(dev_priv) >= 9) {
-		val |= EDP_PSR2_IO_BUFFER_WAKE(7);
-		val |= EDP_PSR2_FAST_WAKE(7);
+		val |= EDP_PSR2_IO_BUFFER_WAKE(intel_dp->psr.io_buffer_wake);
+		val |= EDP_PSR2_FAST_WAKE(intel_dp->psr.fast_wake);
 	}
 
 	if (intel_dp->psr.psr2_sel_fetch_enabled) {
@@ -724,7 +720,9 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 	int crtc_hdisplay = crtc_state->hw.adjusted_mode.crtc_hdisplay;
 	int crtc_vdisplay = crtc_state->hw.adjusted_mode.crtc_vdisplay;
+	u32 io_buffer_wake, io_buffer_wake_max, io_buffer_wake_min;
 	int psr_max_h = 0, psr_max_v = 0, max_bpp = 0;
+	u32 fast_wake, fast_wake_max, fast_wake_min;
 
 	if (!intel_dp->psr.sink_psr2_support)
 		return false;
@@ -768,14 +766,26 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 		psr_max_h = 5120;
 		psr_max_v = 3200;
 		max_bpp = 30;
+		io_buffer_wake_max = TGL_EDP_PSR2_IO_BUFFER_WAKE_MAX_LINES;
+		io_buffer_wake_min = TGL_EDP_PSR2_IO_BUFFER_WAKE_MIN_LINES;
+		fast_wake_max = TGL_EDP_PSR2_FAST_WAKE_MAX_LINES;
+		fast_wake_min = TGL_EDP_PSR2_FAST_WAKE_MIN_LINES;
 	} else if (DISPLAY_VER(dev_priv) >= 10) {
 		psr_max_h = 4096;
 		psr_max_v = 2304;
 		max_bpp = 24;
+		io_buffer_wake_max = EDP_PSR2_IO_BUFFER_WAKE_MAX_LINES;
+		io_buffer_wake_min = EDP_PSR2_IO_BUFFER_WAKE_MIN_LINES;
+		fast_wake_max = EDP_PSR2_FAST_WAKE_MAX_LINES;
+		fast_wake_min = EDP_PSR2_FAST_WAKE_MIN_LINES;
 	} else if (IS_DISPLAY_VER(dev_priv, 9)) {
 		psr_max_h = 3640;
 		psr_max_v = 2304;
 		max_bpp = 24;
+		io_buffer_wake_max = EDP_PSR2_IO_BUFFER_WAKE_MAX_LINES;
+		io_buffer_wake_min = EDP_PSR2_IO_BUFFER_WAKE_MIN_LINES;
+		fast_wake_max = EDP_PSR2_FAST_WAKE_MAX_LINES;
+		fast_wake_min = EDP_PSR2_FAST_WAKE_MIN_LINES;
 	}
 
 	if (crtc_state->pipe_bpp > max_bpp) {
@@ -785,6 +795,37 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 		return false;
 	}
 
+	/*
+	 * B.Spec 49274
+	 * IO buffer wake lines = ROUNDUP(PSR2 IO wake time / total line time in microseconds)
+	 * Fast wake lines = ROUNDUP(PSR2 aux transaction time / total line time in microseconds)
+	 * For both fields limit the minimum to 7 lines and maximum to 12 lines
+	 * PSR2 IO wake time = 50us, PSR2 aux transaction time = 32us.
+	 */
+	io_buffer_wake = intel_usecs_to_scanlines(&crtc_state->uapi.adjusted_mode,
+						  EDP_PSR2_IO_WAKE_TIME);
+	fast_wake = intel_usecs_to_scanlines(&crtc_state->uapi.adjusted_mode,
+					     EDP_PSR2_AUX_TRANSACTION_TIME);
+
+	if (io_buffer_wake < io_buffer_wake_min || io_buffer_wake > io_buffer_wake_max) {
+		drm_dbg_kms(&dev_priv->drm,
+			    "PSR condition failed: Invalid PSR2 IO Buffer Wake lines (%d)\n",
+			    io_buffer_wake);
+		return false;
+	}
+
+	if (fast_wake < fast_wake_min || fast_wake > fast_wake_max) {
+		drm_dbg_kms(&dev_priv->drm,
+			    "PSR condition failed: Invalid PSR2 FAST Wake lines (%d)\n",
+			    fast_wake);
+		return false;
+	}
+
+	intel_dp->psr.io_buffer_wake =
+		io_buffer_wake < EDP_PSR2_IO_BUFFER_WAKE_DEFAULT ? EDP_PSR2_IO_BUFFER_WAKE_DEFAULT : io_buffer_wake;
+	intel_dp->psr.fast_wake =
+		fast_wake < EDP_PSR2_FAST_WAKE_DEFAULT ? EDP_PSR2_FAST_WAKE_DEFAULT : fast_wake;
+
 	/*
 	 * HW sends SU blocks of size four scan lines, which means the starting
 	 * X coordinate and Y granularity requirements will always be met. We
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index cbf7a60afe54..0fc121720364 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4568,14 +4568,22 @@ enum {
 #define   EDP_MAX_SU_DISABLE_TIME(t)		((t) << 20)
 #define   EDP_MAX_SU_DISABLE_TIME_MASK		(0x1f << 20)
 #define   EDP_PSR2_IO_BUFFER_WAKE_MAX_LINES	8
+#define   EDP_PSR2_IO_BUFFER_WAKE_MIN_LINES	5
+#define   EDP_PSR2_IO_BUFFER_WAKE_DEFAULT	7
 #define   EDP_PSR2_IO_BUFFER_WAKE(lines)	((EDP_PSR2_IO_BUFFER_WAKE_MAX_LINES - (lines)) << 13)
 #define   EDP_PSR2_IO_BUFFER_WAKE_MASK		(3 << 13)
+#define   EDP_PSR2_IO_WAKE_TIME			50
+#define   TGL_EDP_PSR2_IO_BUFFER_WAKE_MAX_LINES	12
 #define   TGL_EDP_PSR2_IO_BUFFER_WAKE_MIN_LINES	5
 #define   TGL_EDP_PSR2_IO_BUFFER_WAKE(lines)	(((lines) - TGL_EDP_PSR2_IO_BUFFER_WAKE_MIN_LINES) << 13)
 #define   TGL_EDP_PSR2_IO_BUFFER_WAKE_MASK	(7 << 13)
 #define   EDP_PSR2_FAST_WAKE_MAX_LINES		8
+#define   EDP_PSR2_FAST_WAKE_MIN_LINES		5
+#define   EDP_PSR2_FAST_WAKE_DEFAULT		7
 #define   EDP_PSR2_FAST_WAKE(lines)		((EDP_PSR2_FAST_WAKE_MAX_LINES - (lines)) << 11)
 #define   EDP_PSR2_FAST_WAKE_MASK		(3 << 11)
+#define   EDP_PSR2_AUX_TRANSACTION_TIME		32
+#define   TGL_EDP_PSR2_FAST_WAKE_MAX_LINES	12
 #define   TGL_EDP_PSR2_FAST_WAKE_MIN_LINES	5
 #define   TGL_EDP_PSR2_FAST_WAKE(lines)		(((lines) - TGL_EDP_PSR2_FAST_WAKE_MIN_LINES) << 10)
 #define   TGL_EDP_PSR2_FAST_WAKE_MASK		(7 << 10)
-- 
2.30.1

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