Alex Deucher 6c0ae2ab85 drm/radeon: properly handle crtc powergating
Need to make sure the crtc is gated on before modesetting.
Explicitly gate the crtc on in prepare() and set a flag
so that the dpms functions don't gate it off during
mode set.

Noticed by sylware on IRC.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-13 10:50:50 -04:00
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