[PATCH 22/66] drm/amd/display: drain dmub inbox if queue is full

[Qingqing Zhuo]

From: Josip Pavic <josip.pa...@amd.com>

[Why & How]
If dmub command queuing fails due to the inbox being full, flush the
inbox and resubmit the comamnd. This was previously the default behavior
but was lost in a refactor.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>
Acked-by: Qingqing Zhuo <qingqing.z...@amd.com>
Signed-off-by: Josip Pavic <josip.pa...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c 
b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
index 954cbfdbc3b6..eef43577508c 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
@@ -139,6 +139,15 @@ bool dc_dmub_srv_cmd_run_list(struct dc_dmub_srv 
*dc_dmub_srv, unsigned int coun
                // Queue command
                status = dmub_srv_cmd_queue(dmub, &cmd_list[i]);
 
+               if (status == DMUB_STATUS_QUEUE_FULL) {
+                       /* Execute and wait for queue to become empty again. */
+                       dmub_srv_cmd_execute(dmub);
+                       dmub_srv_wait_for_idle(dmub, 100000);
+
+                       /* Requeue the command. */
+                       status = dmub_srv_cmd_queue(dmub, &cmd_list[i]);
+               }
+
                if (status != DMUB_STATUS_OK) {
                        DC_ERROR("Error queueing DMUB command: status=%d\n", 
status);
                        dc_dmub_srv_log_diagnostic_data(dc_dmub_srv);
-- 
2.34.1