[Intel-gfx] [PATCH v5 2/3] drm/i915: Fix the inconsistent RMW in WA 827

[Radhakrishna Sripada]

RMW is used only in the disable path. Using it in enable path
for consistency.

Suggested-by: Ville Syrjala <ville.syrjala at linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 30aa1e5324f7..f54183761a40 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -471,6 +471,7 @@ skl_wa_827(struct drm_i915_private *dev_priv, int pipe, bool enable)
 {
 	if (enable)
 		I915_WRITE(CLKGATE_DIS_PSL(pipe),
+			   I915_READ(CLKGATE_DIS_PSL(pipe)) |
 			   DUPS1_GATING_DIS | DUPS2_GATING_DIS);
 	else
 		I915_WRITE(CLKGATE_DIS_PSL(pipe),
-- 
2.20.0.rc2.7.g965798d1f299