drm/i915/bdw: Implement edp PSR workarounds

This implements a workaround for PSR dealing with some vblank issue.

WaPsrDPAMaskVBlankInSRD && WaPsrDPRSUnmaskVBlankInSRD

v2: forgot to git add bogus whitespace fix

v3: Update with workaround names.
Use for_each_pipe() and CHICKEN_PIPESL_1(pipe) macro (Ville)

Cc: Art Runyan <arthur.j.runyan@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Jesse Barnes <jbarnes@virtuosugeek.org>
[danvet: Kill redundant IS_BDW check and remove the copious amount of
uneeded lines added.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 18 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ffe88745898c..f5701ff8847d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4113,8 +4113,14 @@
 # define CHICKEN3_DGMG_DONE_FIX_DISABLE         (1 << 2)
 
 #define CHICKEN_PAR1_1          0x42080
+#define  DPA_MASK_VBLANK_SRD    (1 << 15)
 #define  FORCE_ARB_IDLE_PLANES  (1 << 14)
 
+#define _CHICKEN_PIPESL_1_A     0x420b0
+#define _CHICKEN_PIPESL_1_B     0x420b4
+#define  DPRS_MASK_VBLANK_SRD   (1 << 0)
+#define CHICKEN_PIPESL_1(pipe) _PIPE(pipe, _CHICKEN_PIPESL_1_A, _CHICKEN_PIPESL_1_B)
+
 #define DISP_ARB_CTL    0x45000
 #define  DISP_TILE_SURFACE_SWIZZLING    (1<<13)
 #define  DISP_FBC_WM_DIS                (1<<15)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a35ebcf04fa6..6d186757dc33 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5277,6 +5277,7 @@ static void lpt_suspend_hw(struct drm_device *dev)
 static void gen8_init_clock_gating(struct drm_device *dev)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
+        enum pipe i;
 
         I915_WRITE(WM3_LP_ILK, 0);
         I915_WRITE(WM2_LP_ILK, 0);
@@ -5287,6 +5288,17 @@ static void gen8_init_clock_gating(struct drm_device *dev)
 
         /* WaSwitchSolVfFArbitrationPriority */
         I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);
+
+        /* WaPsrDPAMaskVBlankInSRD */
+        I915_WRITE(CHICKEN_PAR1_1,
+                   I915_READ(CHICKEN_PAR1_1) | DPA_MASK_VBLANK_SRD);
+
+        /* WaPsrDPRSUnmaskVBlankInSRD */
+        for_each_pipe(i) {
+                I915_WRITE(CHICKEN_PIPESL_1(i),
+                           I915_READ(CHICKEN_PIPESL_1(i) |
+                                     DPRS_MASK_VBLANK_SRD));
+        }
 }
 
 static void haswell_init_clock_gating(struct drm_device *dev)