Re: [PATCH v3 0/4] drm/tidss: Add OLDI bridge support

Max Krummenacher
2024-09-09T09:43:04Z

On Mon, Sep 09, 2024 at 11:15:28AM +0300, Tomi Valkeinen wrote:
> Hi,
>
> On 06/09/2024 14:43, Francesco Dolcini wrote:
> > +Max
> >
> > Hello Aradhya,
> >
> > On Tue, Jul 16, 2024 at 02:12:44PM +0530, Aradhya Bhatia wrote:
> > > The addition of the 2nd OLDI TX (and a 2nd DSS in AM62Px) creates a need
> > > for some major changes for a full feature experience.
> > >
> > > 1. The OF graph needs to be updated to accurately show the data flow.
> > > 2. The tidss and OLDI drivers now need to support the dual-link and the
> > > cloned single-link OLDI video signals.
> > > 3. The drivers also need to support the case where 2 OLDI TXes are
> > > connected to 2 different VPs - thereby creating 2 independent streams
> > > of single-link OLDI outputs.
> >
> > Have you considered/tested the use case in which only single link is used?
> > You do not mention it here and to me this is a relevant use case.
> >
> > There is a workaround for this (use option 2, cloned, even if nothing is
> > connected to the second link), but this seems not correct.
> >
> > We (Max in Cc here) noticed that this specific use case is broken on
> > your downstream v6.6 TI branch.
>
> What if you set "fw_devlink=off" kernel boot parameter?

Hi Tomi

My overlay specifing a single link which did not work by default
results in a working panel with "fw_devlink=off" on the cmdline.

Max
>
> Tomi
>