[PATCH v2 RESEND] drm: mxsfb: Implement .format_mod_supported

[Stefan Agner]

On 2020-11-08 22:00, Daniel Abrecht wrote:
> This will make sure applications which use the IN_FORMATS blob
> to figure out which modifiers they can use will pick up the
> linear modifier which is needed by mxsfb. Such applications
> will not work otherwise if an incompatible implicit modifier
> ends up being selected.
> 
> Before commit ae1ed0093281 ("drm: mxsfb: Stop using DRM simple
> display pipeline helper"), the DRM simple display pipeline
> helper took care of this.
> 
> Signed-off-by: Daniel Abrecht <public at danielabrecht.ch>
> Fixes: ae1ed0093281 ("drm: mxsfb: Stop using DRM simple display
> pipeline helper")

Reviewed-by: Stefan Agner <stefan at agner.ch>

I allowed myself to update the author email to the one used in the
Signed-off-by line as checkpatch.pl printed a warning.

Applied to drm-misc-fixes. Thanks!

--
Stefan

> ---
>  drivers/gpu/drm/mxsfb/mxsfb_kms.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> index 956f631997f2..fc4b1626261b 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> @@ -484,6 +484,13 @@ static void
> mxsfb_plane_overlay_atomic_update(struct drm_plane *plane,
>  	writel(ctrl, mxsfb->base + LCDC_AS_CTRL);
>  }
> 
> +static bool mxsfb_format_mod_supported(struct drm_plane *plane,
> +				       uint32_t format,
> +				       uint64_t modifier)
> +{
> +	return modifier == DRM_FORMAT_MOD_LINEAR;
> +}
> +
>  static const struct drm_plane_helper_funcs mxsfb_plane_primary_helper_funcs = {
>  	.atomic_check = mxsfb_plane_atomic_check,
>  	.atomic_update = mxsfb_plane_primary_atomic_update,
> @@ -495,6 +502,7 @@ static const struct drm_plane_helper_funcs
> mxsfb_plane_overlay_helper_funcs = {
>  };
> 
>  static const struct drm_plane_funcs mxsfb_plane_funcs = {
> +	.format_mod_supported	= mxsfb_format_mod_supported,
>  	.update_plane		= drm_atomic_helper_update_plane,
>  	.disable_plane		= drm_atomic_helper_disable_plane,
>  	.destroy		= drm_plane_cleanup,