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radeon: fix fence race condition hopefully

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For some reason reading the SCRATCH reg from RAM causes some race to occur.
Hopefully fix this.
This commit is contained in:
Dave Airlie 2008-11-10 15:37:36 +10:00
parent 195cc0d817
commit 213a71f31b
1 changed files with 7 additions and 6 deletions
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13
linux-core/radeon_fence.c
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@ -57,14 +57,15 @@ static void radeon_fence_poll(struct drm_device *dev, uint32_t fence_class,
{
struct drm_radeon_private *dev_priv = (struct drm_radeon_private *) dev->dev_private;
uint32_t sequence;
if (waiting_types & DRM_FENCE_TYPE_EXE) {
sequence = READ_BREADCRUMB(dev_priv);
sequence = RADEON_READ(RADEON_SCRATCH_REG3);
/* this used to be READ_BREADCRUMB(dev_priv); but it caused
* a race somewhere in the fencing irq
*/
DRM_DEBUG("polling %d\n", sequence);
drm_fence_handler(dev, 0, sequence,
DRM_FENCE_TYPE_EXE, 0);
}
DRM_DEBUG("polling %d\n", sequence);
drm_fence_handler(dev, 0, sequence,
DRM_FENCE_TYPE_EXE, 0);
}
void radeon_fence_handler(struct drm_device * dev)