drm/radeon/dpm: add helper to calculate vblank time
authorAlex Deucher <alexander.deucher@amd.com>
Mon, 8 Jul 2013 15:26:42 +0000 (11:26 -0400)
committerAlex Deucher <alexander.deucher@amd.com>
Mon, 8 Jul 2013 21:40:09 +0000 (17:40 -0400)
Required for checking vblank time for mclk changes.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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