From: Sinclair Yeh Date: Wed, 19 Feb 2014 21:09:31 +0000 (-0800) Subject: drm/i915: Revert workaround for disabling L3 cache aging on BYT X-Git-Tag: firefly_0821_release~176^2~3773^2~63^2~314 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=47e74f0fd12dca6981cbcbdd710899867115c692;p=firefly-linux-kernel-4.4.55.git drm/i915: Revert workaround for disabling L3 cache aging on BYT V2: edit the commit message to contain more info The W/A spreadsheet says this is still required, but the b-spec says it's not for BYT-T. So the documentation is not clear. However, our experience with the other SKUs of BYT-I/M on Android and Linux suggests that setting this bit actually causes GPU hang for certain OGL benchmark applications. Removing this bit completely resolves the GPU hangs. Signed-off-by: Sinclair Yeh Acked-by: Jesse Barnes Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 3e754fec58b5..d668866ba2eb 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -5043,9 +5043,6 @@ static void valleyview_init_clock_gating(struct drm_device *dev) _MASKED_BIT_ENABLE(GEN7_MAX_PS_THREAD_DEP | GEN7_PSD_SINGLE_PORT_DISPATCH_ENABLE)); - /* WaDisableL3CacheAging:vlv */ - I915_WRITE(GEN7_L3CNTLREG1, I915_READ(GEN7_L3CNTLREG1) | GEN7_L3AGDIS); - /* WaForceL3Serialization:vlv */ I915_WRITE(GEN7_L3SQCREG4, I915_READ(GEN7_L3SQCREG4) & ~L3SQ_URB_READ_CAM_MATCH_DISABLE);