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

Tomi Valkeinen
2024-09-09T08:15:35Z

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?

Tomi