RE: [PATCH] drm/bridge: ite-it6263: Support VESA input format

[Biju Das]

Hi Dmitry Baryshkov,

> -----Original Message-----
> From: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> Sent: 05 December 2024 11:43
> Subject: Re: [PATCH] drm/bridge: ite-it6263: Support VESA input format
> 
> On Thu, 5 Dec 2024 at 11:01, Liu Ying <victor.liu@xxxxxxx> wrote:
> >
> > On 12/04/2024, Biju Das wrote:
> > > Hi Liu Ying,
> >
> > Hi Biju,
> >
> > >
> > >> -----Original Message-----
> > >> From: Liu Ying <victor.liu@xxxxxxx>
> > >> Sent: 04 December 2024 03:43
> > >> Subject: Re: [PATCH] drm/bridge: ite-it6263: Support VESA input
> > >> format
> > >>
> > >> On 12/04/2024, Dmitry Baryshkov wrote:
> > >>> On Tue, Dec 03, 2024 at 06:21:29PM +0100, tomm.merciai@xxxxxxxxx wrote:
> > >>>> From: Tommaso Merciai <tommaso.merciai.xr@xxxxxxxxxxxxxx>
> > >>>>
> > >>>> Introduce it6263_is_input_bus_fmt_valid() and refactor the
> > >>>> it6263_bridge_atomic_get_input_bus_fmts() function to support
> > >>>> VESA format by selecting the LVDS input format based on the LVDS
> > >>>> data mapping and thereby support both JEIDA and VESA input formats.
> > >>>
> > >>> For the patch itself,
> > >>>
> > >>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> > >>>
> > >>> A more generic question: is the bridge limited to 4 lanes or does
> > >>> it support 3-lane or 5-lane configurations?
> > >>
> > >> According to ite,it6263.yaml, the bridge supports all the data
> > >> mappings(jeida-{18,24,30} and vesa-
> > >> {24,30}) listed in lvds-data-mapping.yaml.  lvds-data-mapping.yaml
> > >> specifies the data lanes(3/4/5) used by each of the data mappings.  So, the bridge supports 3, 4
> or 5 data lanes.
> > >
> > > In Renesas SMARC RZ/G3E LVDS add on board, only 4 LVDS Rx lanes connected. The 5th one is
> unconnected.
> > > What is the situation in your board Liu Ying?
> >
> > The adapter cards I'm using to connect with i.MX8MP EVK have only 4
> > LVDS data lanes routed out.
> 
> What about the bridge SoC. I don't understand why the driver gets limited by a particular add-on card.

Bridge SoC supports up to 5 Rx Lanes. But vendors do the wiring to bridge SoC and 
currently as far as we know there are 2 boards with ITE 6263 bridge SoC and both of
them has 4 LVDS rx lanes connected and both vesa-24 and Jeida-24 formats are tested.

Cheers,
Biju