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authorDave Airlie <airlied@starflyer.(none)>2005-09-30 17:09:07 +1000
committerDave Airlie <airlied@linux.ie>2005-09-30 17:09:07 +1000
commit689b9d74b1c00e1316fbb7d1e912fe1227fdb1ab (patch)
tree46d53c2d2ecb31d3db08f034052106030a9d8046 /drivers/char/drm/radeon_cp.c
parentb6ce156c415544f900e031890c78eba8bc92f9b3 (diff)
drm: add option to force writeback off.
In order to get some better debugging from people about certain hangs/crashes we need to be able to turn AGP writeback off permanently... Signed-off-by: Dave Airlie <airlied@linux.ie>
Diffstat (limited to 'drivers/char/drm/radeon_cp.c')
-rw-r--r--drivers/char/drm/radeon_cp.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/char/drm/radeon_cp.c b/drivers/char/drm/radeon_cp.c
index 447bfbe0da8..e64d680899f 100644
--- a/drivers/char/drm/radeon_cp.c
+++ b/drivers/char/drm/radeon_cp.c
@@ -1205,6 +1205,10 @@ static void radeon_cp_init_ring_buffer(drm_device_t * dev,
dev_priv->writeback_works = 0;
DRM_DEBUG("writeback test failed\n");
}
+ if (radeon_no_wb == 1) {
+ dev_priv->writeback_works = 0;
+ DRM_DEBUG("writeback forced off\n");
+ }
dev_priv->sarea_priv->last_frame = dev_priv->scratch[0] = 0;
RADEON_WRITE(RADEON_LAST_FRAME_REG, dev_priv->sarea_priv->last_frame);