On the dce_v6_0 and dce_v8_0 hpd tear down callback, the tmp variable
should be written into the control register instead of 0.
Reviewed-by: NAndré Almeida <andrealmeid@igalia.com>
Signed-off-by: NMaíra Canal <mairacanal@riseup.net>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>