drm/i915: Clear scanline waits after disabling the pipe.

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If we disable the pipe and the GPU is currently waiting on a scanline
WAIT_FOR_EVENT, the GPU will hang. Fortunately, there is a magic bit
which we can write on i915+ to break this wait after disabling the
pipe.

References:

  Bug 29252 - [Arrandale] Hung WAIT_FOR_EVENT when running rss-glx-skyrocket
  https://bugs.freedesktop.org/show_bug.cgi?id=29252

  Bug 28964 - [i965gm] GPU infinite MI_WAIT_FOR_EVENT while watching video in Totem
  https://bugs.freedesktop.org/show_bug.cgi?id=28964

and many others.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>

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This commit is contained in:

Chris Wilson 2010-08-08 11:53:53 +01:00

parent 37811fcc91

commit 4b60e5cb70

2 changed files with 31 additions and 2 deletions

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2

drivers/gpu/drm/i915/i915_reg.h

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31

drivers/gpu/drm/i915/intel_display.c

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