Enabling AMDGPU by default for SI & CIK

[Alex Deucher]

On Tue, Aug 4, 2020 at 10:48 PM Bridgman, John <John.Bridgman at amd.com> wrote:
>
> [AMD Official Use Only - Internal Distribution Only]
>
>
> At the risk of asking a dumb question, does amdgpu default to using DC on SI and CI ?
>

DC is disabled by default on SI and CI due to the lack of analog
encoder support.

> I'm asking because a lot of people seem to be using amdgpu successfully with analog outputs today on SI/CI... suggests that they are not using DC ?

Yes.

>
> If so then would enabling HDMI/DP audio support without DC be sufficient to flip the switch assuming we felt that other risks were manageable ?

Possibly.  VCE support for SI is also missing in amdgpu.

I think the biggest challenge will be making sure things like suspend
and resume work.

Alex

>
> Thanks,
> John
>
> ________________________________
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Alex Deucher <alexdeucher at gmail.com>
> Sent: August 4, 2020 1:35 PM
> To: Michel Dänzer <michel at daenzer.net>
> Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>; amd-gfx mailing list <amd-gfx at lists.freedesktop.org>; Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
> Subject: Re: Enabling AMDGPU by default for SI & CIK
>
> On Tue, Aug 4, 2020 at 4:38 AM Michel Dänzer <michel at daenzer.net> wrote:
> >
> > On 2020-08-03 1:45 a.m., Bas Nieuwenhuizen wrote:
> > > Hi all,
> > >
> > > Now that we have recently made some progress on getting feature parity
> > > with the Radeon driver for SI, I'm wondering what it would take to
> > > make AMDGPU the default driver for these generations.
> > >
> > > As far as I understand AMDGPU has had these features for CIK for a
> > > while already but it is still not the default driver. What would it
> > > take to make it the default? What is missing and/or broken?
> >
> > The main blockers I'm aware of for CIK are:
> >
> > 1) Lack of analogue connector support with DC
> > 2) Lack of HDMI/DP audio support without DC
> >
> >
> > 1) may apply to SI as well.
>
> Also, IIRC, there are suspend and resume problems with some CIK parts
> using amdgpu.
>
> Alex
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