diff --git a/src/amd/common/ac_cmdbuf_cp.c b/src/amd/common/ac_cmdbuf_cp.c
index 2046149daf6..8b5f6e14230 100644
--- a/src/amd/common/ac_cmdbuf_cp.c
+++ b/src/amd/common/ac_cmdbuf_cp.c
@@ -447,7 +447,10 @@ ac_emit_cp_release_mem(struct ac_cmdbuf *cs, enum amd_gfx_level gfx_level,
 {
    const bool is_mec = gfx_level >= GFX7 && ip_type == AMD_IP_COMPUTE;
 
-   /* EOS events may be buggy on GFX7, prefer not to use them. */
+   /* GFX7 CP DMA: 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.
+    * Maybe related to waCpDmaHangMcTcAckDrop in PAL.
+    */
    if (gfx_level == GFX7 && (event == V_028A90_CS_DONE || event == V_028A90_PS_DONE))
       event = V_028A90_BOTTOM_OF_PIPE_TS;
 
diff --git a/src/amd/common/ac_gpu_info.c b/src/amd/common/ac_gpu_info.c
index 98efe103b5a..d965e5255db 100644
--- a/src/amd/common/ac_gpu_info.c
+++ b/src/amd/common/ac_gpu_info.c
@@ -958,6 +958,7 @@ ac_query_gpu_info(int fd, void *dev_p, struct radeon_info *info,
 
    /* GFX6 hw bug when the IBO addr is 0 which causes invalid clamping (underflow).
     * Setting the IB addr to 2 or higher solves this issue.
+    * See waMiscNullIb in PAL.
     */
    info->has_null_index_buffer_clamping_bug = info->gfx_level == GFX6;
 
diff --git a/src/amd/common/sid.h b/src/amd/common/sid.h
index 9c19d225d29..8b25ad7cb84 100644
--- a/src/amd/common/sid.h
+++ b/src/amd/common/sid.h
@@ -202,10 +202,6 @@
 #define     EOS_DATA_SEL_APPEND_COUNT                 0
 #define     EOS_DATA_SEL_GDS                          1
 #define     EOS_DATA_SEL_VALUE_32BIT                  2
-/* 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 GFX7 chips are affected.
- */
 #define PKT3_EVENT_WRITE_EOS                       0x48 /* GFX6-8, breaks CP DMA */
 #define PKT3_RELEASE_MEM                           0x49 /* GFX9+ [any ring] or GFX8 [compute ring only] */
 /* 1. header