Re: [PATCH] media: rcar-vin: Add support for RAW10

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Hi Geert,

On Wed, Apr 17, 2024 at 03:34:36PM +0200, Geert Uytterhoeven wrote:
> On Wed, Apr 17, 2024 at 2:06 PM Niklas Söderlund wrote:
> > Some R-Car SoCs are capable of capturing RAW10. Add support for it
> > using the V4L2_PIX_FMT_Y10 pixel format, which I think is the correct
> > format to express RAW10 unpacked to users.
> >
> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
> 
> Thanks for your patch!
> 
> I am no VIN or V4L2 expert, but the register bits LGTM, so
> Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> 
> > --- a/drivers/media/platform/renesas/rcar-vin/rcar-dma.c
> > +++ b/drivers/media/platform/renesas/rcar-vin/rcar-dma.c
> > @@ -780,6 +782,9 @@ static int rvin_setup(struct rvin_dev *vin)
> >         case MEDIA_BUS_FMT_Y8_1X8:
> >                 vnmc |= VNMC_INF_RAW8;
> >                 break;
> > +       case MEDIA_BUS_FMT_Y10_1X10:
> > +               vnmc |= VNMC_INF_RGB666;
> 
> The actual meaning of this bit is not uniform across all SoCs.
> On R-Car V3U it means (partial) 16 bpp, on R-Car Gen3 it means 18 bpp.

The INF bits have different meanings depending on the VIN input. What
you refer to above for V3U is for the CSI-2 input, while for the rest of
Gen3 you quote the values for the parallel input. Value 111 is
documented as "prohibit" for the CSI-2 input on the rest of Gen3.

> > +               break;
> >         default:
> >                 break;
> >         }

-- 
Regards,

Laurent Pinchart




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