drm/radeon: disable mclk switching with 120hz+ monitors
These tend to be problematic even if the vblank period is long enough. This needs more investigation across a wider range of displays. Disable for now. bugs: https://bugs.freedesktop.org/show_bug.cgi?id=87796 https://bugs.freedesktop.org/show_bug.cgi?id=89198Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
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