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drm/i915: add timeout to FBC disable waits

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FBC disable on 965 can take long enough to trigger latency checks in the
kernel so be sure to timeout after a reasonable period.

Fixes https://bugzilla.kernel.org/show_bug.cgi?id=15015.

Tested-by: James Ettle <theholyettlz@googlemail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Jesse Barnes 2010-05-21 09:40:45 -07:00 committed by Eric Anholt
parent d1b851fc0d
commit 9517a92f48
1 changed files with 11 additions and 2 deletions
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13
drivers/gpu/drm/i915/intel_display.c
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@ -1029,19 +1029,28 @@ static void i8xx_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
void i8xx_disable_fbc(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
unsigned long timeout = jiffies + msecs_to_jiffies(1);
u32 fbc_ctl;
if (!I915_HAS_FBC(dev))
return;
if (!(I915_READ(FBC_CONTROL) & FBC_CTL_EN))
return; /* Already off, just return */
/* Disable compression */
fbc_ctl = I915_READ(FBC_CONTROL);
fbc_ctl &= ~FBC_CTL_EN;
I915_WRITE(FBC_CONTROL, fbc_ctl);
/* Wait for compressing bit to clear */
while (I915_READ(FBC_STATUS) & FBC_STAT_COMPRESSING)
; /* nothing */
while (I915_READ(FBC_STATUS) & FBC_STAT_COMPRESSING) {
if (time_after(jiffies, timeout)) {
DRM_DEBUG_DRIVER("FBC idle timed out\n");
break;
}
; /* do nothing */
}
intel_wait_for_vblank(dev);