Re: [PATCH v7 07/10] drm: bridge: samsung-dsim: Add atomic_get_input_bus_fmts

[Jagan Teki <jagan@amarulasolutions.com>]

On Sun, Oct 16, 2022 at 3:31 AM Marek Vasut <marex@denx.de> wrote:
>
> On 10/5/22 17:13, Jagan Teki wrote:
>
> [...]
>
> > @@ -1321,6 +1322,32 @@ static void samsung_dsim_atomic_post_disable(struct drm_bridge *bridge,
> >       pm_runtime_put_sync(dsi->dev);
> >   }
> >
> > +#define MAX_INPUT_SEL_FORMATS        1
> > +
> > +static u32 *
> > +samsung_dsim_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
> > +                                    struct drm_bridge_state *bridge_state,
> > +                                    struct drm_crtc_state *crtc_state,
> > +                                    struct drm_connector_state *conn_state,
> > +                                    u32 output_fmt,
> > +                                    unsigned int *num_input_fmts)
> > +{
> > +     u32 *input_fmts;
> > +
> > +     *num_input_fmts = 0;
> > +
> > +     input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
> > +                          GFP_KERNEL);
> > +     if (!input_fmts)
> > +             return NULL;
> > +
> > +     /* This is the DSI-end bus format */
> > +     input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
> > +     *num_input_fmts = 1;
>
> Is this the only supported format ? NXP AN13573 lists the following:
>
> i.MX 8/RT MIPI DSI/CSI-2, Rev. 0, 21 March 2022
> 3.7.4 Pixel formats
> Table 14. DSI pixel packing formats
>
> Loosely Packed Pixel Stream, 20-bit YCbCr, 4:2:2
> Packed Pixel Stream, 24-bit YCbCr, 4:2:2
> Packed Pixel Stream, 16-bit YCbCr, 4:2:2

Look like these are unsupported in media-bus-format.h list.

> Packed Pixel Stream, 30-bit RGB, 10-10-10
> Packed Pixel Stream, 36-bit RGB, 12-12-12
> Packed Pixel Stream, 12-bit YCbCr, 4:2:0

Same issue, unsupported.

> Packed Pixel Stream, 16-bit RGB, 5-6-5

MEDIA_BUS_FMT_RGB565_1X16

> Packed Pixel Stream, 18-bit RGB, 6-6-6

Same issue, unsupported.

> Loosely Packed Pixel Stream, 18-bit RGB, 6-6-6
> Packed Pixel Stream, 24-bit RGB, 8-8-8 Format

MEDIA_BUS_FMT_RGB666_1X18
MEDIA_BUS_FMT_RGB888_1X24

>
> The MX8MM/MN LCDIF can generate all of those RGB formats , the MX8MP
> LCDIFv3 can also generate the 16bit YCbCr .

Is YCbCr denoted as UYVY in media-bus-format.h ?

Thanks,
Jagan.