From 285b15261833cccb0fd2396f3404b7a7d59a014e Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Mon, 2 Nov 2009 16:01:27 -0500 Subject: [PATCH] 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 --- drivers/gpu/drm/radeon/r100.c | 12 ++++++------ drivers/gpu/drm/radeon/r600.c | 8 +++----- 2 files changed, 9 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c index b438b52..5e821a3 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 e87475c..60fbb23 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); -- 1.5.6.3