diff options
| -rw-r--r-- | drivers/gpu/drm/radeon/r600.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index 1741af86943c..f56e65579835 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -3302,6 +3302,10 @@ int r600_irq_process(struct radeon_device *rdev) if (!rdev->ih.enabled || rdev->shutdown) return IRQ_NONE; + /* No MSIs, need a dummy read to flush PCI DMAs */ + if (!rdev->msi_enabled) + RREG32(IH_RB_WPTR); + wptr = r600_get_ih_wptr(rdev); rptr = rdev->ih.rptr; DRM_DEBUG("r600_irq_process start: rptr %d, wptr %d\n", rptr, wptr); |