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

[Eugeni Dodonov]

On Wed, Oct 5, 2011 at 16:56, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:

> On Wed,  5 Oct 2011 10:25:17 -0700
> Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
>
> > This set of patches lays the groundwork for supporting 3 pipes on IVB
> > hardware.  We've only tested it so far with 2 HDMI plus 1 VGA (a
> > configuration that doesn't work), and are awaiting 3 DP port hardware
> > (the officially supported config) to complete our testing.
> >
> > So this patchset is necessary but may not be sufficient (once we have 3
> > DP hardware we can debug and see).  Review and comments appreciated.
>
> Gordon, I think this set (with the updated 4/4 patch) is ready for
> testing.  You'll need a configuration that uses the same monitor on two
> identical ports to get all the pipes running.  I'm also interested in
> the failure cases though.  There are some limitations:
>  1) two heads need to use the same timings and ports
>  2) FDI B and C share lanes, so are limited to a max of two lanes each
>
> For (1), I'm currently using a VGA attached monitor, an HDMI attached
> monitor, and another HDMI monitor attached to a DP->HDMI dongle on my
> SDV (that allows me to drive the port with the HDMI encoder rather than
> the DP encoder).
>
> 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...
>

It works - with a small change to the FDI_COMPOSITE_SYNC which we discussed
on irc with Jesse - I'll send it on the corresponding patch.

With that change, for the series:

Reviewed-by: Eugeni Dodonov <eugeni.dodonov at intel.com>
Tested-By: Eugeni Dodonov <eugeni.dodonov at intel.com>

-- 
Eugeni Dodonov
<http://eugeni.dodonov.net/>
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