On 07/12, Aurabindo Pillai wrote: > > > On 7/12/2023 12:24 PM, Melissa Wen wrote: > > On 07/12, Pillai, Aurabindo wrote: > > > [Public] > > > > > > Hi Guilherme, > > > > > > Sorry there was one more patch which I missed to attach. Please add this > > > 3rd patch and retry. > > > > > > Reverting that patch would cause high power consumption on Navi2x GPU > > > also cause hangs on certain multi monitor configurations. With these 3 > > > patches, you're getting the same effect as reverting the aforementioned > > > patches, but it makes the reverted sequence available only for Steam deck > > > hardware. > > > > > > > Hi Jay, > > > > Thanks for looking at this issue. > > > > You mention power consumption and multi-monitor configuration issues > > that can affect a driver if we revert this OTG change, and both sounds > > quite relevant to me. Can they not affect DCN301 too? Is there something > > that needs further work so the DCN301 can benefit from this improvement > > as well? > > > > Also, let us know if we can contribute in any way. > > > > Hi Melissa, > > Unfortunately, DCN301 does not support Firmware Assisted Memory Clock > Switching, which is the feature that gets blocked on Navi2x if we revert the > patch in question. This is the feature that enables lower power consumption > on some multi monitor configurations and high refresh rate single monitor > configurations. > > Navi2x is configured to use FAMS in the driver, but without this change, > firmware wont be able to actually enable the feature in DMCUB, which puts > the driver in a unexpected state. On DCN301, this unexpected state will not > occur, because there is no FAMS support in driver nor firmware.
Oh, got it. Sounds fine. Many thanks for explaning the context of this change. Best Regards, Melissa > > -- > Jay > > >
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