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drm/radeon/kms: r600 handle irq vector ring overflow

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In some rare case i faced an irq overflow quickly followed by
a GPU lockup (hard hang) this patch try to deal with irq vector
ring overflow, so far haven't been able to reproduce it with
the patch.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
This commit is contained in:
Jerome Glisse 2010-01-15 14:44:39 +01:00 committed by Dave Airlie
parent 79c2bbc505
commit 7924e5eb8f
1 changed files with 7 additions and 3 deletions
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10
drivers/gpu/drm/radeon/r600.c
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@ -2648,9 +2648,13 @@ static inline u32 r600_get_ih_wptr(struct radeon_device *rdev)
wptr = RREG32(IH_RB_WPTR);
if (wptr & RB_OVERFLOW) {
WARN_ON(1);
/* XXX deal with overflow */
DRM_ERROR("IH RB overflow\n");
/* When a ring buffer overflow happen start parsing interrupt
* from the last not overwritten vector (wptr + 16). Hopefully
* this should allow us to catchup.
*/
dev_warn(rdev->dev, "IH ring buffer overflow (0x%08X, %d, %d)\n",
wptr, rdev->ih.rptr, (wptr + 16) + rdev->ih.ptr_mask);
rdev->ih.rptr = (wptr + 16) & rdev->ih.ptr_mask;
tmp = RREG32(IH_RB_CNTL);
tmp |= IH_WPTR_OVERFLOW_CLEAR;
WREG32(IH_RB_CNTL, tmp);