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authorMarek Olšák <[email protected]>2016-11-30 01:38:23 +0100
committerMarek Olšák <[email protected]>2016-12-01 02:16:51 +0100
commit77014a0ad36acf11b704ab20456259831a102308 (patch)
treec186ccf61cb5ddaf65a7d522e621f309a19fce1a /src/amd
parentbacf9b4e735cc9d96acd2d507dfb2fc8831966a3 (diff)
radeonsi: document a CP DMA bug that doesn't need a workaround yet
This one is easy to miss, because it's not documented in any internal doc. Reviewed-by: Nicolai Hähnle <[email protected]>
Diffstat (limited to 'src/amd')
-rw-r--r--src/amd/common/sid.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/amd/common/sid.h b/src/amd/common/sid.h
index 7f598cad9a0..3b3983fe277 100644
--- a/src/amd/common/sid.h
+++ b/src/amd/common/sid.h
@@ -151,7 +151,11 @@
#define PKT3_COND_WRITE 0x45
#define PKT3_EVENT_WRITE 0x46
#define PKT3_EVENT_WRITE_EOP 0x47
-#define PKT3_EVENT_WRITE_EOS 0x48
+/* CP DMA bug: Any use of CP_DMA.DST_SEL=TC must be avoided when EOS packets
+ * are used. Use DST_SEL=MC instead. For prefetch, use SRC_SEL=TC and
+ * DST_SEL=MC. Only CIK chips are affected.
+ */
+/*#define PKT3_EVENT_WRITE_EOS 0x48*/ /* fix CP DMA before uncommenting */
#define PKT3_ONE_REG_WRITE 0x57 /* not on CIK */
#define PKT3_ACQUIRE_MEM 0x58 /* new for CIK */
#define PKT3_SET_CONFIG_REG 0x68