[Intel-gfx] [PATCH 6/6] drm/i915: Add support for CCS modifiers

[Ben Widawsky]

On 17-08-02 12:14:15, Daniel Vetter wrote:
>On Tue, Aug 01, 2017 at 09:14:50AM -0700, Ben Widawsky wrote:
>> On 17-07-31 10:29:55, Daniel Vetter wrote:
>> > On Sat, Jul 29, 2017 at 09:25:50AM -0700, Ben Widawsky wrote:
>> > > On 17-07-29 13:53:10, Daniel Stone wrote:
>> > > > Hi Ben,
>> > > >
>> > > > On 26 July 2017 at 19:08, Ben Widawsky <ben at bwidawsk.net> wrote:
>> > > > > +       } else if (INTEL_GEN(dev_priv) >= 9) {
>> > > > >                 intel_primary_formats = skl_primary_formats;
>> > > > >                 num_formats = ARRAY_SIZE(skl_primary_formats);
>> > > > > -               modifiers = skl_format_modifiers;
>> > > > > +               if (pipe >= PIPE_C)
>> > > > > +                       modifiers = skl_format_modifiers_ccs;
>> > > > > +               else
>> > > > > +                       modifiers = skl_format_modifiers_noccs;
>> > > >
>> > > > Shouldn't that be (pipe < PIPE_C)?
>> > > >
>> > > > Cheers,
>> > > > Daniel
>> > >
>> > > Yep. It was wrong in v7 too :/. I have it fixed locally.
>> >
>> > Shouldn't the igt catch this, or does it not try to exercise all the
>> > plane/crtc combos there are?
>> > -Daniel
>>
>> I don't know whether or not IGT should have caught this, but it wouldn't have
>> because I had been sending these without Ville's patches, so my patches alone
>> don't even build (since his patches defined the modifiers).
>
>You can run igt testcases locally. I expect you to do that, at least for
>the stuff you're touching.
>
>Does this mean there's no igts for this at all?
>-Daniel

I haven't been running IGT locally, so I don't know if they touch this path.
We've done all testing so far with kmscube, X, and weston; then measure the
overall bandwidth. In this case, I'd stop testing these since Jason/Daniel took
over my other patches. I don't even know how to locally make sure I get a
display on pipe C.

You could easily make an IGT make sure that you get back the right list of
modifiers for a given pipe on a given GEN. Probably should do one.

>-- 
>Daniel Vetter
>Software Engineer, Intel Corporation
>http://blog.ffwll.ch