drm/i915: Idle unused rings on gen2/3 during init/resume

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gen2/3 platforms have a boatload of rings we're not using. On my 830
the BIOS/hw can leave some of those "active" after resume which will
prevent c3 entry. The ring is apparently considered active whenever
head != tail even if the ring is disabled.

Disable and clear all such unused ringbuffers on init/resume.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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Ville Syrjälä 2014-08-15 01:21:55 +03:00 • committed by Daniel Vetter

parent 1038392b4d

commit 81e7f2002b

2 changed files with 42 additions and 0 deletions

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35

drivers/gpu/drm/i915/i915_gem.c

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7

drivers/gpu/drm/i915/i915_reg.h

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