Re: [PATCH v4 5/7] drm: rcar-du: lvds: Fix mode for companion encoder

[Laurent Pinchart]

Hi Fabrizio,

Thank you for the patch.

On Fri, Dec 06, 2019 at 04:32:52PM +0000, Fabrizio Castro wrote:
> Primary and companion encoders need to set the same mode for
> things to work properly.
> 
> rcar_lvds_mode_set gets called into for the primary encoder only,
> therefore initialize the companion encoder mode while sorting
> the primary encoder mode out.
> 
> Fixes: fa440d870358 ("drm: rcar-du: lvds: Add support for dual-link mode")
> Signed-off-by: Fabrizio Castro <fabrizio.castro@xxxxxxxxxxxxxx>

Would you mind rebasing this on top of "drm: rcar-du: lvds: Get mode
from state" ?

> ---
> v3->v4:
> * New patch extracted from patch:
>   "drm: rcar-du: lvds: Add dual-LVDS panels support"
> ---
>  drivers/gpu/drm/rcar-du/rcar_lvds.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
> index cb2147c..eed5611 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
> @@ -614,6 +614,18 @@ static void rcar_lvds_mode_set(struct drm_bridge *bridge,
>  	lvds->display_mode = *adjusted_mode;
>  
>  	rcar_lvds_get_lvds_mode(lvds);
> +	if (lvds->companion) {
> +		struct rcar_lvds *companion_lvds = bridge_to_rcar_lvds(
> +							lvds->companion);
> +
> +		/*
> +		 * FIXME: We should not be messing with the companion encoder
> +		 * private data from the primary encoder, but since
> +		 * rcar_lvds_mode_set gets called into for the primary encoder
> +		 * only, we don't have much of a choice for now.
> +		 */
> +		companion_lvds->mode = lvds->mode;
> +	}
>  }
>  
>  static int rcar_lvds_attach(struct drm_bridge *bridge)

-- 
Regards,

Laurent Pinchart