drm/radeon/kms: fix possible mis-detection of sideport on rs690/rs740
Check ulBootUpMemoryClock on AMD IGPs. Fix regression noticed by Torsten Kaiser <just.for.lkml@googlemail.com> Signed-off-by: NAlex Deucher <alexdeucher@gmail.com> Cc: stable@kernel.org Signed-off-by: NDave Airlie <airlied@redhat.com>
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