drm/amd/display: clear request when release aux engine

[Why]
when driver and dmub request aux engine at the same time,
dmub grant the aux engine but driver fail. Then driver
release aux engine but doesn't clear the request bit.
Then aux engine will be occupied by driver forever.

[How]
When driver release aux engine, clear request bit as well.

Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Paul Hsieh <paul.hsieh@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
index 29e20d92b0bb0783dd71aea16143dceda491ba59..9e39cd7b203edd96c8ff5813275ed3f4826983e2 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
@@ -87,7 +87,8 @@ static void release_engine(
 
        engine->ddc = NULL;
 
-       REG_UPDATE(AUX_ARB_CONTROL, AUX_SW_DONE_USING_AUX_REG, 1);
+       REG_UPDATE_2(AUX_ARB_CONTROL, AUX_SW_DONE_USING_AUX_REG, 1,
+               AUX_SW_USE_AUX_REG_REQ, 0);
 }
 
 #define SW_CAN_ACCESS_AUX 1