From: Jerome Glisse Date: Fri, 15 Jan 2010 13:44:39 +0000 (+0100) Subject: drm/radeon/kms: r600 handle irq vector ring overflow X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7924e5eb8fe422d6b1ce3b3e2be749a480dfcdd9;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git drm/radeon/kms: r600 handle irq vector ring overflow 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 Reviewed-by: Alex Deucher Signed-off-by: Dave Airlie --- diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index 0f9a8c6788a3..bb9115bdc3a2 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -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);