Commit 28eebb70 authored by Alex Deucher's avatar Alex Deucher Committed by Dave Airlie
Browse files

drm/radeon/kms: disable writeback on pre-R300 asics

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: default avatarHelge Deller <>
Reported-by: default avatarDave Airlie <>
Signed-off-by: default avatarAlex Deucher <>
Signed-off-by: default avatarDave Airlie <>
parent c1341e52
......@@ -224,8 +224,11 @@ 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;
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