[PATCH 06/20] drm/amd/display: Fix crash on setting VRR with no display connected

[Pavle Kotarac]

From: Harry VanZyllDeJong <hvanzyll at amd.com>

[HOW&WHY]
VRR was getting set at the same time
the timing generator would be null when there was no display
connected. Added null check to the timing generator variable
so it does not get referenced if it is null.

Reviewed-by: Harry Vanzylldejong <harry.vanzylldejong at amd.com>
Reviewed-by: Evgenii Krasnikov <Evgenii.Krasnikov at amd.com>
Reviewed-by: Nicholas Choi <Nicholas.Choi at amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac at amd.com>
Signed-off-by: Harry VanZyllDeJong <hvanzyll at amd.com>
---
 .../amd/display/dc/dcn10/dcn10_hw_sequencer.c    | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index 2d3d870f0bea..328569ad2bd6 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -3049,12 +3049,16 @@ void dcn10_set_drr(struct pipe_ctx **pipe_ctx,
 	 * as well.
 	 */
 	for (i = 0; i < num_pipes; i++) {
-		pipe_ctx[i]->stream_res.tg->funcs->set_drr(
-			pipe_ctx[i]->stream_res.tg, &params);
-		if (adjust.v_total_max != 0 && adjust.v_total_min != 0)
-			pipe_ctx[i]->stream_res.tg->funcs->set_static_screen_control(
-					pipe_ctx[i]->stream_res.tg,
-					event_triggers, num_frames);
+		if ((pipe_ctx[i]->stream_res.tg != NULL) && pipe_ctx[i]->stream_res.tg->funcs) {
+			if (pipe_ctx[i]->stream_res.tg->funcs->set_drr)
+				pipe_ctx[i]->stream_res.tg->funcs->set_drr(
+					pipe_ctx[i]->stream_res.tg, &params);
+			if (adjust.v_total_max != 0 && adjust.v_total_min != 0)
+				if (pipe_ctx[i]->stream_res.tg->funcs->set_static_screen_control)
+					pipe_ctx[i]->stream_res.tg->funcs->set_static_screen_control(
+						pipe_ctx[i]->stream_res.tg,
+						event_triggers, num_frames);
+		}
 	}
 }
 
-- 
2.32.0