drm/radeon/kms: disable writeback on pre-R300 asics
authorAlex Deucher <alexander.deucher@amd.com>
Tue, 3 Jan 2012 14:48:38 +0000 (09:48 -0500)
committerDave Airlie <airlied@redhat.com>
Thu, 5 Jan 2012 10:07:10 +0000 (10:07 +0000)
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>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
drivers/gpu/drm/radeon/radeon_device.c

index 846eeb852e5990e2616eb3d86c7239260c4d9472..79b08b487298c9fe131caa4c048be79b24814339 100644 (file)
@@ -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;