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path: root/drivers/gpu/drm/radeon/r420.c
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Diffstat (limited to 'drivers/gpu/drm/radeon/r420.c')
-rw-r--r--drivers/gpu/drm/radeon/r420.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/r420.c b/drivers/gpu/drm/radeon/r420.c
index c05a7270cf0c..f46502a253ec 100644
--- a/drivers/gpu/drm/radeon/r420.c
+++ b/drivers/gpu/drm/radeon/r420.c
@@ -30,6 +30,7 @@
#include "radeon_reg.h"
#include "radeon.h"
#include "atom.h"
+#include "r100d.h"
#include "r420d.h"
int r420_mc_init(struct radeon_device *rdev)
@@ -165,6 +166,34 @@ static void r420_clock_resume(struct radeon_device *rdev)
WREG32_PLL(R_00000D_SCLK_CNTL, sclk_cntl);
}
+static void r420_cp_errata_init(struct radeon_device *rdev)
+{
+ /* RV410 and R420 can lock up if CP DMA to host memory happens
+ * while the 2D engine is busy.
+ *
+ * The proper workaround is to queue a RESYNC at the beginning
+ * of the CP init, apparently.
+ */
+ radeon_scratch_get(rdev, &rdev->config.r300.resync_scratch);
+ radeon_ring_lock(rdev, 8);
+ radeon_ring_write(rdev, PACKET0(R300_CP_RESYNC_ADDR, 1));
+ radeon_ring_write(rdev, rdev->config.r300.resync_scratch);
+ radeon_ring_write(rdev, 0xDEADBEEF);
+ radeon_ring_unlock_commit(rdev);
+}
+
+static void r420_cp_errata_fini(struct radeon_device *rdev)
+{
+ /* Catch the RESYNC we dispatched all the way back,
+ * at the very beginning of the CP init.
+ */
+ radeon_ring_lock(rdev, 8);
+ radeon_ring_write(rdev, PACKET0(R300_RB3D_DSTCACHE_CTLSTAT, 0));
+ radeon_ring_write(rdev, R300_RB3D_DC_FINISH);
+ radeon_ring_unlock_commit(rdev);
+ radeon_scratch_free(rdev, rdev->config.r300.resync_scratch);
+}
+
static int r420_startup(struct radeon_device *rdev)
{
int r;
@@ -196,6 +225,7 @@ static int r420_startup(struct radeon_device *rdev)
dev_err(rdev->dev, "failled initializing CP (%d).\n", r);
return r;
}
+ r420_cp_errata_init(rdev);
r = r100_wb_init(rdev);
if (r) {
dev_err(rdev->dev, "failled initializing WB (%d).\n", r);
@@ -238,6 +268,7 @@ int r420_resume(struct radeon_device *rdev)
int r420_suspend(struct radeon_device *rdev)
{
+ r420_cp_errata_fini(rdev);
r100_cp_disable(rdev);
r100_wb_disable(rdev);
r100_irq_disable(rdev);