[PATCH 6.1.y 10/10] drm/amd/display: trigger timing sync only if TG is running

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From: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>

[Why&How]
If the timing generator isnt running, it does not make sense to trigger
a sync on the corresponding OTG. Check this condition before starting.
Otherwise, this will cause error like:

*ERROR* GSL: Timeout on reset trigger!

Fixes: dc55b106ad47 ("drm/amd/display: Disable phantom OTG after enable for plane disable")
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
(cherry picked from commit 6066aaf74f510fc171dbe9375153aee2d60d37aa)
NOTE: This is also 5f9f97c02dd2 ("drm/amd/display: trigger timing sync
only if TG is running")
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 6 ++++++
 1 file changed, 6 insertions(+)

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 a6fde27d1347..394027118963 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
@@ -2284,6 +2284,12 @@ void dcn10_enable_timing_synchronization(
 		opp = grouped_pipes[i]->stream_res.opp;
 		tg = grouped_pipes[i]->stream_res.tg;
 		tg->funcs->get_otg_active_size(tg, &width, &height);
+
+		if (!tg->funcs->is_tg_enabled(tg)) {
+			DC_SYNC_INFO("Skipping timing sync on disabled OTG\n");
+			return;
+		}
+
 		if (opp->funcs->opp_program_dpg_dimensions)
 			opp->funcs->opp_program_dpg_dimensions(opp, width, 2*(height) + 1);
 	}
-- 
2.34.1




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