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

commit 28eebb703e28bc455ba704adb1026f76649b768c upstream.

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@gmx.de>
Reported-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index b51e15725c6e45321b088664749a48101e79be28..50d105a1c7479d23372bd0b0f4d04960bfffcd06 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -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;