drm/radeon/kms: enable hpd support
This enabled interrupt driven hpd support for all radeon chips. Assuming the hpd pin is wired up correctly, the driver will generate uevents on digital monitor connect and disconnect and retrain DP monitors automatically. Signed-off-by: NAlex Deucher <alexdeucher@gmail.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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