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authorAlex Deucher <alexdeucher@gmail.com>2009-11-02 16:01:27 -0500
committerDave Airlie <airlied@redhat.com>2009-11-04 09:53:25 +1000
commitd6f28938d9426d12eea1578949f1d73d24ad37ec (patch)
tree5450e0a9c108ec9d5875679ece20faa770c44310 /drivers/gpu
parentdf67bed92fa86ef926da8b62a6da68722388ff72 (diff)
downloadlinux-d6f28938d9426d12eea1578949f1d73d24ad37ec.tar.bz2
drm/radeon/kms: Don't RMW CP_RB_CNTL
Immediate readback seems faulty on some chips. I suspect it takes a while to get through the fifo to the actual register backbone. There's no need to read it back, so, just write the driver's copy of the register's value directly. Should fix bug 24535 and possibly 24218 Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/radeon/r100.c12
-rw-r--r--drivers/gpu/drm/radeon/r600.c8
2 files changed, 9 insertions, 11 deletions
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index b438b520ee7f..5e821a313a8c 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -578,19 +578,19 @@ int r100_cp_init(struct radeon_device *rdev, unsigned ring_size)
indirect1_start = 16;
/* cp setup */
WREG32(0x718, pre_write_timer | (pre_write_limit << 28));
- WREG32(RADEON_CP_RB_CNTL,
-#ifdef __BIG_ENDIAN
- RADEON_BUF_SWAP_32BIT |
-#endif
- REG_SET(RADEON_RB_BUFSZ, rb_bufsz) |
+ tmp = (REG_SET(RADEON_RB_BUFSZ, rb_bufsz) |
REG_SET(RADEON_RB_BLKSZ, rb_blksz) |
REG_SET(RADEON_MAX_FETCH, max_fetch) |
RADEON_RB_NO_UPDATE);
+#ifdef __BIG_ENDIAN
+ tmp |= RADEON_BUF_SWAP_32BIT;
+#endif
+ WREG32(RADEON_CP_RB_CNTL, tmp);
+
/* Set ring address */
DRM_INFO("radeon: ring at 0x%016lX\n", (unsigned long)rdev->cp.gpu_addr);
WREG32(RADEON_CP_RB_BASE, rdev->cp.gpu_addr);
/* Force read & write ptr to 0 */
- tmp = RREG32(RADEON_CP_RB_CNTL);
WREG32(RADEON_CP_RB_CNTL, tmp | RADEON_RB_RPTR_WR_ENA);
WREG32(RADEON_CP_RB_RPTR_WR, 0);
WREG32(RADEON_CP_RB_WPTR, 0);
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index e87475c87d52..60fbb236edfd 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -1272,19 +1272,17 @@ int r600_cp_resume(struct radeon_device *rdev)
/* Set ring buffer size */
rb_bufsz = drm_order(rdev->cp.ring_size / 8);
+ tmp = RB_NO_UPDATE | (drm_order(RADEON_GPU_PAGE_SIZE/8) << 8) | rb_bufsz;
#ifdef __BIG_ENDIAN
- WREG32(CP_RB_CNTL, BUF_SWAP_32BIT | RB_NO_UPDATE |
- (drm_order(RADEON_GPU_PAGE_SIZE/8) << 8) | rb_bufsz);
-#else
- WREG32(CP_RB_CNTL, RB_NO_UPDATE | (drm_order(RADEON_GPU_PAGE_SIZE/8) << 8) | rb_bufsz);
+ tmp |= BUF_SWAP_32BIT;
#endif
+ WREG32(CP_RB_CNTL, tmp);
WREG32(CP_SEM_WAIT_TIMER, 0x4);
/* Set the write pointer delay */
WREG32(CP_RB_WPTR_DELAY, 0);
/* Initialize the ring buffer's read and write pointers */
- tmp = RREG32(CP_RB_CNTL);
WREG32(CP_RB_CNTL, tmp | RB_RPTR_WR_ENA);
WREG32(CP_RB_RPTR_WR, 0);
WREG32(CP_RB_WPTR, 0);