From: Paul Hsieh <paul.hsieh@xxxxxxx> [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@xxxxxxx> Acked-by: Qingqing Zhuo <qingqing.zhuo@xxxxxxx> Signed-off-by: Paul Hsieh <paul.hsieh@xxxxxxx> --- drivers/gpu/drm/amd/display/dc/dce/dce_aux.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) 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 29e20d92b0bb..9e39cd7b203e 100644 --- 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 -- 2.25.1
