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drm/i915: Terminate the FORCE WAKE after we have finished reading

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Once we have read the value out of the GT power well, we need to remove
the FORCE WAKE bit to allow the system to auto-power down.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
2010-12-08 17:32:24 +00:00
parent a8e93126a6
commit eb43f4af7e
3 changed files with 35 additions and 9 deletions
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drivers/gpu/drm/i915/i915_drv.c
+22
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@@ -244,6 +244,28 @@ void intel_detect_pch (struct drm_device *dev)
}
}
void __gen6_force_wake_get(struct drm_i915_private *dev_priv)
{
int count;
count = 0;
while (count++ < 50 && (I915_READ_NOTRACE(FORCEWAKE_ACK) & 1))
udelay(10);
I915_WRITE_NOTRACE(FORCEWAKE, 1);
POSTING_READ(FORCEWAKE);
count = 0;
while (count++ < 50 && (I915_READ_NOTRACE(FORCEWAKE_ACK) & 1) == 0)
udelay(10);
}
void __gen6_force_wake_put(struct drm_i915_private *dev_priv)
{
I915_WRITE_NOTRACE(FORCEWAKE, 0);
POSTING_READ(FORCEWAKE);
}
static int i915_drm_freeze(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;