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drm/i915:gen9: restrict WaC6DisallowByGfxPause
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@intel.com> Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1469008825-19442-1-git-send-email-tim.gore@intel.com
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@ -349,7 +349,9 @@ static int guc_ucode_xfer(struct drm_i915_private *dev_priv)
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}
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/* WaC6DisallowByGfxPause*/
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I915_WRITE(GEN6_GFXPAUSE, 0x30FFF);
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if (IS_SKL_REVID(dev, 0, SKL_REVID_C0) ||
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IS_BXT_REVID(dev, 0, BXT_REVID_B0))
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I915_WRITE(GEN6_GFXPAUSE, 0x30FFF);
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if (IS_BROXTON(dev))
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I915_WRITE(GEN9LP_GT_PM_CONFIG, GT_DOORBELL_ENABLE);
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