On Sat, Dec 07, 2019 at 03:03:29PM +0100, Sam Ravnborg wrote:
> The callbacks in drm_panel_funcs are optional, so do not
> return an error just because no callback is assigned.
[...]
> diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> index ed7985c0535a..4ab7229fb22b 100644
> --- a/drivers/gpu/drm/drm_panel.c
> +++ b/drivers/gpu/drm/drm_panel.c
[...]
> @@ -228,10 +240,13 @@ EXPORT_SYMBOL(drm_panel_disable);
> */
> int drm_panel_get_modes(struct drm_panel *panel)
> {
> - if (panel && panel->funcs && panel->funcs->get_modes)
> + if (!panel)
> + return -EINVAL;
> +
> + if (panel->funcs && panel->funcs->get_modes)
> return panel->funcs->get_modes(panel);
>
> - return panel ? -ENOSYS : -EINVAL;
> + return -EOPNOTSUPP;
> }
> EXPORT_SYMBOL(drm_panel_get_modes);
>
> diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
> index ce8da64022b4..d71655b2634c 100644
> --- a/include/drm/drm_panel.h
> +++ b/include/drm/drm_panel.ha
[...]
> /**
> * @get_modes:
> *
> - * Add modes to the connector that the panel is attached to and
> - * return the number of modes added.
> + * Add modes to the connector that the panel is attached to.
> + *
> + * This function is mandatory.
> + *
> + * Returns the number of modes added, -EOPNOTSUPP if callback
> + * is missing, -EINVAL if panel is NULL.
> */
> int (*get_modes)(struct drm_panel *panel);
>
Hi!
If .get_modes is mandatory, then panel->func != NULL checks can be removed
if panel->func and .get_modes presence gets checked at panel probe time.
Best Regards,
Michał Mirosław
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