drm/amdgpu/powerplay: program display gap for tonga.

Implement displaygap programming for tonga.  This is
required for properly mclk switching.

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rex Zhu 2015-10-16 15:02:04 +08:00 • committed by Alex Deucher
commit bbb207f3da