From: Fudong Wang <Fudong.Wang@xxxxxxx>
[Why]
After ODM clock off, optc underflow bit will be kept there always and clear not work.
We need to clear that before clock off.
[How]
Clear that if have when clock off.
Reviewed-by: Alvin Lee <alvin.lee2@xxxxxxx>
Acked-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Signed-off-by: Fudong Wang <Fudong.Wang@xxxxxxx>
---
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
index bcca4847590d..cdb6e2f220f4 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
@@ -479,6 +479,11 @@ void optc1_enable_optc_clock(struct timing_generator *optc, bool enable)
OTG_CLOCK_ON, 1,
1, 1000);
} else {
+
+ //last chance to clear underflow, otherwise, it will always there due to clock is off.
+ if (optc->funcs->is_optc_underflow_occurred(optc) == true)
+ optc->funcs->clear_optc_underflow(optc);
+
REG_UPDATE_2(OTG_CLOCK_CONTROL,
OTG_CLOCK_GATE_DIS, 0,
OTG_CLOCK_EN, 0);
--
2.25.1
