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drm/radeon: some r420s have a CP race with the DMA engine.

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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>
This commit is contained in:
Alex Deucher 2009-09-21 14:48:45 +10:00 committed by Dave Airlie
parent 5a6e9f9658
commit aadd4e1745
2 changed files with 26 additions and 0 deletions
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23
drivers/gpu/drm/radeon/radeon_cp.c
View file

@ -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;

3
drivers/gpu/drm/radeon/radeon_drv.h
View file

@ -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)