Re: [PATCH v1 05/16] drm/fsl-dcu: fix opencoded use of drm_panel_*

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On 2019-08-04 22:16, Sam Ravnborg wrote:
> Use drm_panel_get_modes() to access modes.
> This has a nice side effect to simplify the code.
> 
> Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Cc: Stefan Agner <stefan@xxxxxxxx>
> Cc: Alison Wang <alison.wang@xxxxxxx>
> ---
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> index 279d83eaffc0..a92fd6c70b09 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> @@ -65,17 +65,9 @@ static const struct drm_connector_funcs
> fsl_dcu_drm_connector_funcs = {
>  static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
>  {
>  	struct fsl_dcu_drm_connector *fsl_connector;
> -	int (*get_modes)(struct drm_panel *panel);
> -	int num_modes = 0;
>  
>  	fsl_connector = to_fsl_dcu_connector(connector);
> -	if (fsl_connector->panel && fsl_connector->panel->funcs &&
> -	    fsl_connector->panel->funcs->get_modes) {
> -		get_modes = fsl_connector->panel->funcs->get_modes;
> -		num_modes = get_modes(fsl_connector->panel);
> -	}
> -
> -	return num_modes;
> +	return drm_panel_get_modes(fsl_connector->panel);

Oh, that old code looks rather messy. Thanks for the simplification!

This behaves slightly different since it now returns -EINVAL or -ENOSYS,
but that is what we want.

Acked-by: Stefan Agner <stefan@xxxxxxxx>

--
Stefan

>  }
>  
>  static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
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