[PATCH 5/5] drm/vc4: dpi: Support DPI interface in mode3 for RGB565

[Dave Stevenson]

Hi Chris

Thanks for the patch.

On Mon, 3 Jan 2022 at 17:41, Chris Morgan <macroalpha82 at gmail.com> wrote:
>
> From: Chris Morgan <macromorgan at hotmail.com>
>
> Add support for the VC4 DPI driver to utilize DPI mode 3. This is
> defined here as xxxRRRRRxxGGGGGGxxxBBBBB:
>
> https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#parallel-display-interface-dpi
>
> This mode is required to use the Geekworm MZP280 DPI display.
>
> Signed-off-by: Chris Morgan <macromorgan at hotmail.com>

Reviewed-by: Dave Stevenson <dave.stevenson at raspberrypi.com>

The other patches all look valid to me, but I'll leave those for the
more experienced maintainers.

  Dave

> ---
>  drivers/gpu/drm/vc4/vc4_dpi.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
> index c180eb60bee8..3c58ade2549e 100644
> --- a/drivers/gpu/drm/vc4/vc4_dpi.c
> +++ b/drivers/gpu/drm/vc4/vc4_dpi.c
> @@ -173,6 +173,10 @@ static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
>                         dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_3,
>                                                DPI_FORMAT);
>                         break;
> +               case MEDIA_BUS_FMT_RGB565_1X24_CPADHI:
> +                       dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_2,
> +                                              DPI_FORMAT);
> +                       break;
>                 default:
>                         DRM_ERROR("Unknown media bus format %d\n", bus_format);
>                         break;
> --
> 2.25.1
>