[Intel-gfx] [PATCH 1/3] Revert "drm/i915: W/A for underruns with WM1+ disabled on icl"

[Ville Syrjala]

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

This reverts commit bf002c100740f4ae01d0d86b44f65a712ee14031.

The hw team has come up with a better workaround. So
let's get rid of this one.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h      | 1 -
 drivers/gpu/drm/i915/intel_display.c | 6 ------
 2 files changed, 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0df8c6e76da7..f3f0b53c9e0e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7653,7 +7653,6 @@ enum {
 #define _PIPEB_CHICKEN			0x71038
 #define _PIPEC_CHICKEN			0x72038
 #define  PER_PIXEL_ALPHA_BYPASS_EN	(1 << 7)
-#define  PM_FILL_MAINTAIN_DBUF_FULLNESS	(1 << 0)
 #define PIPE_CHICKEN(pipe)		_MMIO_PIPE(pipe, _PIPEA_CHICKEN,\
 						   _PIPEB_CHICKEN)
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0a8913b2059e..73a107b6eb9a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3971,12 +3971,6 @@ static void icl_set_pipe_chicken(struct intel_crtc *crtc)
 	 */
 	tmp |= PER_PIXEL_ALPHA_BYPASS_EN;
 
-	/*
-	 * W/A for underruns with linear/X-tiled with
-	 * WM1+ disabled.
-	 */
-	tmp |= PM_FILL_MAINTAIN_DBUF_FULLNESS;
-
 	I915_WRITE(PIPE_CHICKEN(pipe), tmp);
 }
 
-- 
2.19.2