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drm/i915: Clear out old GT FIFO errors in intel_uncore_early_sanitize()

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The BIOS or someone else might have done something bad and there
might be old GT FIFO erros reported in GTFIFODBG. Clear those out
in intel_uncore_early_sanitize() to make sure we don't mistake them
for our problems.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2013-12-03 11:30:09 +02:00 committed by Daniel Vetter
parent 168c3f2151
commit 97058870e6
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/i915/intel_uncore.c
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@ -332,6 +332,11 @@ void intel_uncore_early_sanitize(struct drm_device *dev)
DRM_INFO("Found %zuMB of eLLC\n", dev_priv->ellc_size); DRM_INFO("Found %zuMB of eLLC\n", dev_priv->ellc_size);
} }
/* clear out old GT FIFO errors */
if (IS_GEN6(dev) || IS_GEN7(dev))
__raw_i915_write32(dev_priv, GTFIFODBG,
__raw_i915_read32(dev_priv, GTFIFODBG));
intel_uncore_forcewake_reset(dev); intel_uncore_forcewake_reset(dev);
} }