From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_uncore.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 0db5472..ab6173d 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -325,6 +325,11 @@ void intel_uncore_early_sanitize(struct drm_device *dev)
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);
}
--
1.8.3.2
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