[PATCH 08/16] drm/amd/display: Retry Replay residency

[Zaeem Mohamed]

From: ChunTao Tso <ChunTao.Tso at amd.com>

[Why]
Because sometime DMUB GPINT will time out,
 it will cause we return 0 as residency number.

[How]
Retry to avoid this happened.

Reviewed-by: Robin Chen <robin.chen at amd.com>
Signed-off-by: ChunTao Tso <ChunTao.Tso at amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed at amd.com>
---
 .../gpu/drm/amd/display/dc/dce/dmub_replay.c   | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dmub_replay.c b/drivers/gpu/drm/amd/display/dc/dce/dmub_replay.c
index 14f935961672..c31e4f26a305 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dmub_replay.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_replay.c
@@ -12,6 +12,8 @@
 
 #define MAX_PIPES 6
 
+#define GPINT_RETRY_NUM 20
+
 static const uint8_t DP_SINK_DEVICE_STR_ID_1[] = {7, 1, 8, 7, 3};
 static const uint8_t DP_SINK_DEVICE_STR_ID_2[] = {7, 1, 8, 7, 5};
 
@@ -222,6 +224,7 @@ static void dmub_replay_residency(struct dmub_replay *dmub, uint8_t panel_inst,
 	uint32_t *residency, const bool is_start, enum pr_residency_mode mode)
 {
 	uint16_t param = (uint16_t)(panel_inst << 8);
+	uint32_t i = 0;
 
 	switch (mode) {
 	case PR_RESIDENCY_MODE_PHY:
@@ -249,10 +252,17 @@ static void dmub_replay_residency(struct dmub_replay *dmub, uint8_t panel_inst,
 	if (is_start)
 		param |= REPLAY_RESIDENCY_ENABLE;
 
-	// Send gpint command and wait for ack
-	if (!dc_wake_and_execute_gpint(dmub->ctx, DMUB_GPINT__REPLAY_RESIDENCY, param,
-				       residency, DM_DMUB_WAIT_TYPE_WAIT_WITH_REPLY))
-		*residency = 0;
+	for (i = 0; i < GPINT_RETRY_NUM; i++) {
+		// Send gpint command and wait for ack
+		if (dc_wake_and_execute_gpint(dmub->ctx, DMUB_GPINT__REPLAY_RESIDENCY, param,
+			residency, DM_DMUB_WAIT_TYPE_WAIT_WITH_REPLY))
+			return;
+
+		udelay(100);
+	}
+
+	// it means gpint retry many times
+	*residency = 0;
 }
 
 /*
-- 
2.34.1