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Merge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6

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* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm/i915: Fix gen6 (SNB) missed BLT ring interrupts.
This commit is contained in:
Linus Torvalds 2011-06-17 21:15:11 -07:00
commit a6c0a39262
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/i915/i915_irq.c
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@ -1740,6 +1740,16 @@ void ironlake_irq_preinstall(struct drm_device *dev)
INIT_WORK(&dev_priv->rps_work, gen6_pm_rps_work);
I915_WRITE(HWSTAM, 0xeffe);
if (IS_GEN6(dev)) {
/* Workaround stalls observed on Sandy Bridge GPUs by
* making the blitter command streamer generate a
* write to the Hardware Status Page for
* MI_USER_INTERRUPT. This appears to serialize the
* previous seqno write out before the interrupt
* happens.
*/
I915_WRITE(GEN6_BLITTER_HWSTAM, ~GEN6_BLITTER_USER_INTERRUPT);
}
/* XXX hotplug from PCH */