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drm/i915: rip out the HWSTAM missed irq workaround 

With the new ducttape of much finer quality, this seems to be no
longer necessary.

Tested on my ivb and snb machine with the usual suspects of testcases.

(v2 by keithp -- limited change to IVB only for now)

Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Daniel Vetter 2012-01-05 01:05:26 +01:00 committed by Keith Packard
parent 4cd53c0c8b
commit bdfcdb6379
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/i915_irq.c
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@ -1751,7 +1751,8 @@ static 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) || IS_GEN7(dev)) {
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