From aadd4e17452d3d5c2269cd2b000b7de7cfb6c79e Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Mon, 21 Sep 2009 14:48:45 +1000 Subject: [PATCH] drm/radeon: some r420s have a CP race with the DMA engine. 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 --- drivers/gpu/drm/radeon/radeon_cp.c | 23 +++++++++++++++++++++++ drivers/gpu/drm/radeon/radeon_drv.h | 3 +++ 2 files changed, 26 insertions(+) diff --git a/drivers/gpu/drm/radeon/radeon_cp.c b/drivers/gpu/drm/radeon/radeon_cp.c index fa063d0cfb6..4f7afc79dd8 100644 --- a/drivers/gpu/drm/radeon/radeon_cp.c +++ b/drivers/gpu/drm/radeon/radeon_cp.c @@ -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; diff --git a/drivers/gpu/drm/radeon/radeon_drv.h b/drivers/gpu/drm/radeon/radeon_drv.h index bc79ad6199b..cb0cfe4b308 100644 --- a/drivers/gpu/drm/radeon/radeon_drv.h +++ b/drivers/gpu/drm/radeon/radeon_drv.h @@ -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) -- 2.20.1