Re: Supporting fused display configurations

Ben Widawsky
2013-12-05T18:19:23Z

On Thu, Dec 05, 2013 at 02:21:08PM +0000, Damien Lespiau wrote:
> On Thu, Dec 05, 2013 at 02:09:33PM +0000, Chris Wilson wrote:
> > Patches look fine. Just relying on fuse registers being correct is like
> > relying on vbt being correct, fraught with anxiety.
>
> Well, I believe those bits are directly reflecting the fuses/straps
> programmed (the sames that will actually disable hw), so it should be
> better than VBT. On the other hand, that's the reason why I only check
> from IVB on and not from ILK to not take unecessary risks on platforms
> with no known fused config.

I'm surprised by this. We had a semi-lengthy mail on the matter
internally, and ISTR there was no way to actually make this work for all
cases. I guess I need to go re-read that.

>
> In any case, if someone with such a device could test the series :)

IMHO the patches can't be merged until it can be verified. If you want
to call that a nak-until-then on patch 6, do. I'd much rather have a
dynamic solution like this though.

>
> --
> Damien

--
Ben Widawsky, Intel Open Source Technology Center