drm/i915/ringbuffer: set FORCE_WAKE bit before reading ring register

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Before reading ring register, set FORCE_WAKE bit to prevent GT core
power down to low power state, otherwise we may read stale values.

Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
[ickle: added a udelay which seemed to do the trick on my SNB]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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Zou Nan hai 2010-11-09 17:17:32 +08:00 • committed by Chris Wilson

parent 527f9e907c

commit cae5852dca

4 changed files with 106 additions and 86 deletions

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176

drivers/gpu/drm/i915/i915_drv.h

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1

drivers/gpu/drm/i915/i915_reg.h

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2

drivers/gpu/drm/i915/intel_ringbuffer.c

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13

drivers/gpu/drm/i915/intel_ringbuffer.h

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