drm/radeon: use drm_mode_vrefresh() rather than mode->vrefresh
Just in case it hasn't been calculated for the mode.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
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Just in case it hasn't been calculated for the mode.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org