Re: [PATCH v3 08/10] drm/rockchip: analogix_dp: correct the connector display color format and bpc

[Sean Paul <seanpaul@chromium.org>]

On Tue, Jun 14, 2016 at 7:46 AM, Yakir Yang <ykk@rock-chips.com> wrote:
> Rockchip VOP couldn't output YUV video format for eDP controller, so
> when driver detect connector support YUV video format, we need to hack
> it down to RGB888.
>
> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
> Acked-by: Mark Yao <mark.yao@rock-chips.com>
> ---
> Changes in v3:
> - Hook the connector's color_formats in .get_modes directly. (Tomasz, reviewed at Google Gerrit)
>     [https://chromium-review.googlesource.com/#/c/346317/15]
> - Add the acked flag from Mark.
>
> Changes in v2: None
>
>  drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index da2e844..95a6f60 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -102,6 +102,22 @@ static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
>         return 0;
>  }
>
> +static int rockchip_dp_get_modes(struct analogix_dp_plat_data *plat_data,
> +                                struct drm_connector *connector)
> +{
> +       struct drm_display_info *di = &connector->display_info;
> +
> +       if (di->color_formats & DRM_COLOR_FORMAT_YCRCB444 ||
> +           di->color_formats & DRM_COLOR_FORMAT_YCRCB422) {
> +               di->color_formats &= ~(DRM_COLOR_FORMAT_YCRCB422 |
> +                                      DRM_COLOR_FORMAT_YCRCB444);
> +               di->color_formats |= DRM_COLOR_FORMAT_RGB444;
> +               di->bpc = 8;

Probably a stupid question, but are you guaranteed that the panel will
support this color format?

> +       }
> +

I think this can be simplified as follows:

/* A comment here about why we're doing this */
u32 mask = DRM_COLOR_FORMAT_YCRCB444 | DRM_COLOR_FORMAT_YCRCB422;
if ((di->color_formats & mask)) {
    DRM_DEBUG_KMS("Swapping display color format from YUV to RGB\n");
    di->color_formats &= ~mask;
    di->color_formats |= DRM_COLOR_FORMAT_RGB444;
    di->bpc = 8;
}

> +       return 0;
> +}
> +
>  static bool
>  rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
>                                    const struct drm_display_mode *mode,
> @@ -313,6 +329,7 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
>         dp->plat_data.subdev_type = dp_data->chip_type;
>         dp->plat_data.power_on = rockchip_dp_poweron;
>         dp->plat_data.power_off = rockchip_dp_powerdown;
> +       dp->plat_data.get_modes = rockchip_dp_get_modes;
>
>         return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
>  }
> --
> 1.9.1
>
>
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