drm: renesas: rcar-du: Add drm_panic support for non-vsp

[Sui Jingfeng]

Hi,


On 5/27/24 21:35, Geert Uytterhoeven wrote:
> Add support for the drm_panic module for DU variants not using the
> VSP-compositor, to display a message on the screen when a kernel panic
> occurs.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas at glider.be>
> Reviewed-by: Jocelyn Falempe <jfalempe at redhat.com>

After all concerns resolved:


Acked-by: Sui Jingfeng <sui.jingfeng at linux.dev>

> ---
> Tested on Koelsch (R-Car M2-W).
> 
> Support for DU variants using the VSP-compositor is more convoluted,
> and left to the DU experts.
> ---
>   drivers/gpu/drm/renesas/rcar-du/rcar_du_plane.c | 14 ++++++++++++--
>   1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_plane.c b/drivers/gpu/drm/renesas/rcar-du/rcar_du_plane.c
> index e445fac8e0b46c21..c546ab0805d656f6 100644
> --- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_plane.c
> +++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_plane.c
> @@ -680,6 +680,12 @@ static const struct drm_plane_helper_funcs rcar_du_plane_helper_funcs = {
>   	.atomic_update = rcar_du_plane_atomic_update,
>   };
>   
> +static const struct drm_plane_helper_funcs rcar_du_primary_plane_helper_funcs = {
> +	.atomic_check = rcar_du_plane_atomic_check,
> +	.atomic_update = rcar_du_plane_atomic_update,
> +	.get_scanout_buffer = drm_fb_dma_get_scanout_buffer,
> +};
> +
>   static struct drm_plane_state *
>   rcar_du_plane_atomic_duplicate_state(struct drm_plane *plane)
>   {
> @@ -812,8 +818,12 @@ int rcar_du_planes_init(struct rcar_du_group *rgrp)
>   		if (ret < 0)
>   			return ret;
>   
> -		drm_plane_helper_add(&plane->plane,
> -				     &rcar_du_plane_helper_funcs);
> +		if (type == DRM_PLANE_TYPE_PRIMARY)
> +			drm_plane_helper_add(&plane->plane,
> +					     &rcar_du_primary_plane_helper_funcs);
> +		else
> +			drm_plane_helper_add(&plane->plane,
> +					     &rcar_du_plane_helper_funcs);


Maybe we could do some untangle, but this is not a strong requirement.
Thanks.

Best regards
Sui

>   		drm_plane_create_alpha_property(&plane->plane);
>