[RESEND PATCH v11 11/18] drm: exynos: dsi: Add atomic_get_input_bus_fmts

[Jagan Teki]

On Wed, Jan 25, 2023 at 2:15 AM Marek Vasut <marex at denx.de> wrote:
>
> On 1/23/23 16:12, Jagan Teki wrote:
>
> [...]
>
> > +static bool exynos_dsi_pixel_output_fmt_supported(u32 fmt)
> > +{
> > +     int i;
>
> if (fmt == MEDIA_BUS_FMT_FIXED)
>   return false;
>
> > +     for (i = 0; i < ARRAY_SIZE(exynos_dsi_pixel_output_fmts); i++) {
> > +             if (exynos_dsi_pixel_output_fmts[i] == fmt)
> > +                     return true;
> > +     }
> > +
> > +     return false;
> > +}
> > +
> > +static u32 *
> > +exynos_dsi_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;
> > +
> > +     if (!exynos_dsi_pixel_output_fmt_supported(output_fmt))
> > +             /*
> > +              * Some bridge/display drivers are still not able to pass the
> > +              * correct format, so handle those pipelines by falling back
> > +              * to the default format till the supported formats finalized.
> > +              */
> > +             output_fmt = MEDIA_BUS_FMT_RGB888_1X24;
>
> You can move this ^ past the kmalloc() call, so in unlikely case the
> kmalloc() fails, it would fail first.

I didn't get this point, what do we need to do if
exynos_dsi_pixel_output_fmt_supported returns false?

Jagan.