drm/amd/powerplay: implement functions of amd_powerplay_func

This is the common interface for interacting with the powerplay
module.

v2: squash in fixes

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Acked-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rex Zhu 2015-08-28 12:56:43 +08:00 • committed by Alex Deucher
commit 577bbe0183