[Intel-gfx] [RFC] Three pipe support for IVB

[Dave Airlie]

On Wed, Oct 5, 2011 at 9:18 PM, Keith Packard <keithp at keithp.com> wrote:
> On Wed, 5 Oct 2011 12:56:47 -0700, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
>
>> Unfortunately, (2) complicates our mode list output.  If you query for
>> available modes, you'll definitely see some that you can't drive with 3
>> pipes enabled.  I'm not sure if the best way to handle that...
>
> All we can do is say 'no' when someone tries to select that
> configuration. We've never figured out a better way to list valid
> settings.
>
> The proposed RandR 1.4 protocol has a 'set everything all at once' API
> which allows you to say 'no' before even starting the mode setting
> process, which is kinda nice. We just need to make sure sure this can be
> mirrored through KMS to the hardware.

Fine for dynamic stuff, how do you pick a correct initial mode?

You can't say no there, you need to make a decision from the
information provided.

Dave.