drm/amd/display: Fix dmub trace event not update issue

[Why & How]
Reference to read pointer which is incorrect.
Change to reference to write pointer.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Eryk Brol <eryk.brol@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
index 55ee27d..2522492 100644 (file)
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
@@ -722,7 +722,7 @@ enum dmub_status dmub_srv_cmd_with_reply_data(struct dmub_srv *dmub,
 static inline void dmub_rb_out_trace_buffer_front(struct dmub_rb *rb,
                                 void *entry)
 {
-       const uint64_t *src = (const uint64_t *)(rb->base_address) + rb->rptr / sizeof(uint64_t);
+       const uint64_t *src = (const uint64_t *)(rb->base_address) + rb->wrpt / sizeof(uint64_t);
        uint64_t *dst = (uint64_t *)entry;
        uint8_t i;