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authorAlex Deucher <alexdeucher@gmail.com>2009-09-21 14:48:45 +1000
committerDave Airlie <airlied@redhat.com>2009-09-21 14:48:45 +1000
commitaadd4e17452d3d5c2269cd2b000b7de7cfb6c79e (patch)
tree7db901a331809805874891319e0624c055a08662 /drivers
parent5a6e9f9658c853fea8ebbf64cd36287f00a011a2 (diff)
downloadlinaro-lsk-aadd4e17452d3d5c2269cd2b000b7de7cfb6c79e.tar.gz
drm/radeon: some r420s have a CP race with the DMA engine.
This patch makes sure the CP doesn't DMA do VRAM while 2D is active by inserting a CP resync token. todo: port to kms. Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/radeon/radeon_cp.c23
-rw-r--r--drivers/gpu/drm/radeon/radeon_drv.h3
2 files changed, 26 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_cp.c b/drivers/gpu/drm/radeon/radeon_cp.c
index fa063d0cfb6..4f7afc79dd8 100644
--- a/drivers/gpu/drm/radeon/radeon_cp.c
+++ b/drivers/gpu/drm/radeon/radeon_cp.c
@@ -616,6 +616,18 @@ static void radeon_do_cp_start(drm_radeon_private_t * dev_priv)
dev_priv->cp_running = 1;
+ /* on r420, any DMA from CP to system memory while 2D is active
+ * can cause a hang. workaround is to queue a CP RESYNC token
+ */
+ if ((dev_priv->flags & RADEON_FAMILY_MASK) == CHIP_R420) {
+ BEGIN_RING(3);
+ OUT_RING(CP_PACKET0(R300_CP_RESYNC_ADDR, 1));
+ OUT_RING(5); /* scratch reg 5 */
+ OUT_RING(0xdeadbeef);
+ ADVANCE_RING();
+ COMMIT_RING();
+ }
+
BEGIN_RING(8);
/* isync can only be written through cp on r5xx write it here */
OUT_RING(CP_PACKET0(RADEON_ISYNC_CNTL, 0));
@@ -653,8 +665,19 @@ static void radeon_do_cp_reset(drm_radeon_private_t * dev_priv)
*/
static void radeon_do_cp_stop(drm_radeon_private_t * dev_priv)
{
+ RING_LOCALS;
DRM_DEBUG("\n");
+ /* finish the pending CP_RESYNC token */
+ if ((dev_priv->flags & RADEON_FAMILY_MASK) == CHIP_R420) {
+ BEGIN_RING(2);
+ OUT_RING(CP_PACKET0(R300_RB3D_DSTCACHE_CTLSTAT, 0));
+ OUT_RING(R300_RB3D_DC_FINISH);
+ ADVANCE_RING();
+ COMMIT_RING();
+ radeon_do_wait_for_idle(dev_priv);
+ }
+
RADEON_WRITE(RADEON_CP_CSQ_CNTL, RADEON_CSQ_PRIDIS_INDDIS);
dev_priv->cp_running = 0;
diff --git a/drivers/gpu/drm/radeon/radeon_drv.h b/drivers/gpu/drm/radeon/radeon_drv.h
index bc79ad6199b..cb0cfe4b308 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.h
+++ b/drivers/gpu/drm/radeon/radeon_drv.h
@@ -1099,6 +1099,9 @@ extern u32 radeon_get_scratch(drm_radeon_private_t *dev_priv, int index);
# define RADEON_CSQ_PRIBM_INDBM (4 << 28)
# define RADEON_CSQ_PRIPIO_INDPIO (15 << 28)
+#define R300_CP_RESYNC_ADDR 0x0778
+#define R300_CP_RESYNC_DATA 0x077c
+
#define RADEON_AIC_CNTL 0x01d0
# define RADEON_PCIGART_TRANSLATE_EN (1 << 0)
# define RS400_MSI_REARM (1 << 3)