Commit 28eebb70 authored Jan 03, 2012 by Alex Deucher Committed by Dave Airlie Jan 05, 2012

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: 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>

parent c1341e52

drivers/gpu/drm/radeon/radeon_device.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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;