[Intel-gfx] [PATCH 08/13] drm/i915/psr: Implement WaPsrDPAMaskVBlankInSRD:hsw

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Implement WaPsrDPAMaskVBlankInSRD:hsw, which makes the hardware
generate the extra vblank between link training and first frame
being transmitted. This is the same thing that's controlled by
TRANS_CHICKEN[21] on skl+ (but due to the funky double buffering
it's effectively always at the rest value after DC5 exit). So
for consistent behaviour we want every platform to generate said
vblank. BDW is already setting this up correctly.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_clock_gating.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_clock_gating.c b/drivers/gpu/drm/i915/intel_clock_gating.c
index a27600bc5976..9682323510cd 100644
--- a/drivers/gpu/drm/i915/intel_clock_gating.c
+++ b/drivers/gpu/drm/i915/intel_clock_gating.c
@@ -562,6 +562,9 @@ static void hsw_init_clock_gating(struct drm_i915_private *i915)
 	/* WaFbcAsynchFlipDisableFbcQueue:hsw,bdw */
 	intel_uncore_rmw(&i915->uncore, CHICKEN_PIPESL_1(PIPE_A), 0, HSW_FBCQ_DIS);
 
+	/* WaPsrDPAMaskVBlankInSRD:hsw */
+	intel_uncore_rmw(&i915->uncore, CHICKEN_PAR1_1, 0, HSW_MASK_VBL_TO_PIPE_IN_SRD);
+
 	/* This is required by WaCatErrorRejectionIssue:hsw */
 	intel_uncore_rmw(&i915->uncore, GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
 			 0, GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
-- 
2.39.2