Re: [PATCH v2] drm/i915:gen9: restrict WaC6DisallowByGfxPause

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Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@xxxxxxxxx>

On 7/20/2016 3:30 PM, tim.gore@xxxxxxxxx wrote:
From: Tim Gore <tim.gore@xxxxxxxxx>

WaC6DisallowByGfxPause is currently applied unconditionally
but is not required in all revisions.

v2: extend application of workaround to agree with w/a
database, which differs from the HSD.

References: HSD#2133391
Signed-off-by: Tim Gore <tim.gore@xxxxxxxxx>
---
  drivers/gpu/drm/i915/intel_guc_loader.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 605c696..96b0259 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -349,7 +349,9 @@ static int guc_ucode_xfer(struct drm_i915_private *dev_priv)
  	}
/* WaC6DisallowByGfxPause*/
-	I915_WRITE(GEN6_GFXPAUSE, 0x30FFF);
+	if (IS_SKL_REVID(dev, 0, SKL_REVID_C0) ||
+	    IS_BXT_REVID(dev, 0, BXT_REVID_B0))
+		I915_WRITE(GEN6_GFXPAUSE, 0x30FFF);
if (IS_BROXTON(dev))
  		I915_WRITE(GEN9LP_GT_PM_CONFIG, GT_DOORBELL_ENABLE);

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