Commit d6f28938 authored by Alex Deucher's avatar Alex Deucher Committed by Dave Airlie
Browse files

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: default avatarAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent df67bed9
......@@ -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);
......
......@@ -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);
......
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