tree bcfa18ced0e36b5a44356096480a750b693a2409
parent 7ac33e47d5769632010e537964c7e45498f8dc26
author Alex Deucher <alexander.deucher@amd.com> 1480371820 -0500
committer Alex Deucher <alexander.deucher@amd.com> 1480429453 -0500

drm/radeon: fix check for port PM availability

The ATPX method does not always exist on the dGPU, it may be located at
the iGPU. The parent device of the iGPU is the root port for which
bridge_d3 is false. This accidentally enables the legacy PM method which
conflicts with port PM and prevented the dGPU from powering on.

Ported from amdgpu commit:
drm/amdgpu: fix check for port PM availability
from Peter Wu.

Fixes: d3ac31f3b4bf9fad (drm/radeon: fix power state when port pm is unavailable (v2))
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Peter Wu <peter@lekensteyn.nl>
Cc: <stable@vger.kernel.org> # 4.8+