diff options
| -rw-r--r-- | shared-core/radeon_cp.c | 6 | ||||
| -rw-r--r-- | shared-core/radeon_drv.h | 1 |
2 files changed, 7 insertions, 0 deletions
diff --git a/shared-core/radeon_cp.c b/shared-core/radeon_cp.c index ccb0023f..54763fc5 100644 --- a/shared-core/radeon_cp.c +++ b/shared-core/radeon_cp.c @@ -1258,6 +1258,12 @@ static void radeon_test_writeback(drm_radeon_private_t * dev_priv) dev_priv->writeback_works = 0; DRM_INFO("writeback forced off\n"); } + + if (!dev_priv->writeback_works) { + /* Disable writeback to avoid unnecessary bus master transfers */ + RADEON_WRITE(RADEON_CP_RB_CNTL, RADEON_READ(RADEON_CP_RB_CNTL) | RADEON_RB_NO_UPDATE); + RADEON_WRITE(RADEON_SCRATCH_UMSK, 0); + } } /* Enable or disable PCI-E GART on the chip */ diff --git a/shared-core/radeon_drv.h b/shared-core/radeon_drv.h index 441c2976..25ce40c3 100644 --- a/shared-core/radeon_drv.h +++ b/shared-core/radeon_drv.h @@ -679,6 +679,7 @@ extern int r300_do_cp_cmdbuf(drm_device_t *dev, DRMFILE filp, #define RADEON_CP_RB_BASE 0x0700 #define RADEON_CP_RB_CNTL 0x0704 # define RADEON_BUF_SWAP_32BIT (2 << 16) +# define RADEON_RB_NO_UPDATE (1 << 27) #define RADEON_CP_RB_RPTR_ADDR 0x070c #define RADEON_CP_RB_RPTR 0x0710 #define RADEON_CP_RB_WPTR 0x0714 |