drm/radeon: update line buffer allocation for dce6
commit 290d24576ccf1aa0373d2185cedfe262d0d4952a upstream.
We need to allocate line buffer to each display when
setting up the watermarks. Failure to do so can lead
to a blank screen. This fixes blank screen problems
on dce6 asics.
Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=64850
Based on an initial fix from:
Jay Cornwall <jay.cornwall@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/gpu/drm/radeon/sid.h b/drivers/gpu/drm/radeon/sid.h
index 45e240d..1767ae7 100644
--- a/drivers/gpu/drm/radeon/sid.h
+++ b/drivers/gpu/drm/radeon/sid.h
@@ -57,6 +57,10 @@
#define DMIF_ADDR_CALC 0xC00
+#define PIPE0_DMIF_BUFFER_CONTROL 0x0ca0
+# define DMIF_BUFFERS_ALLOCATED(x) ((x) << 0)
+# define DMIF_BUFFERS_ALLOCATED_COMPLETED (1 << 4)
+
#define SRBM_STATUS 0xE50
#define CC_SYS_RB_BACKEND_DISABLE 0xe80