On Thu, Mar 26, 2026 at 06:41:12AM +0100, Jerome Tollet wrote: > From: Jerome Tollet <[email protected]> > > Hi Ankit, Ville, > > Following up on this patch. > > As previously reported, the SCDC polling approach fixes the 4K@60Hz HDMI > issue on my Alder Lake-N (N100) + Cisco Desk Pro setup, and I have not > seen regressions in testing. > > Ville, do you see any remaining concern with this approach, or is there > anything else you would like me to test to help move this forward?
My main concern is having the synchronous polling appear to fix something now, and if we later make it asynchronous the original problem may re-appear. That said, after perusing the spec a bit, it looks to me that sinks should be able sync up after at most two video fields. I suppose having effectively two extra vblank waits in a full modeset sequence isn't the end of world. The extra complexity of asynchronous polling might not even be worth the hassle. But the commit message should still highlight that (AFAICS) synchronous polling is not required by the spec, and thus the fact that this fixes some monitors is sort of an accidental byproduct. -- Ville Syrjälä Intel
