From: Alex Deucher <alexander.deucher@xxxxxxx>
We often end up missing fences on older asics with
writeback enabled which leads to delays in the userspace
accel code, so just disable it by default on those asics.
Reported-by: Helge Deller <deller@xxxxxx>
Reported-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/gpu/drm/radeon/radeon_device.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 5fcf135..420db65 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -228,8 +228,11 @@ int radeon_wb_init(struct radeon_device *rdev)
if (radeon_no_wb == 1)
rdev->wb.enabled = false;
else {
- /* often unreliable on AGP */
if (rdev->flags & RADEON_IS_AGP) {
+ /* often unreliable on AGP */
+ rdev->wb.enabled = false;
+ } else if (rdev->family < CHIP_R300) {
+ /* often unreliable on pre-r300 */
rdev->wb.enabled = false;
} else {
rdev->wb.enabled = true;
--
1.7.3.4
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