Subject: Re: [PATCH v1 11/16] drm/panel: move drm_panel functions to .c file

From: Laurent Pinchart <[email-masked]>
Date: Mon, 5 Aug 2019 13:45:15 +0300

Hi Sam,

Thank you for the patch.

On Sun, Aug 04, 2019 at 10:16:32PM +0200, Sam Ravnborg wrote:
> Move inline functions from include/drm/drm_panel.h to drm_panel.c.
> This is in preparation for follow-up patches that will add extra
> logic to the functions.
> As they are no longer static inline, EXPORT them.
> 
> Signed-off-by: Sam Ravnborg <[email-masked]>
> Cc: Thierry Reding <[email-masked]>
> Cc: Sam Ravnborg <[email-masked]>
> Cc: Maarten Lankhorst <[email-masked]>
> Cc: Maxime Ripard <[email-masked]>
> Cc: Sean Paul <[email-masked]>
> Cc: David Airlie <[email-masked]>
> Cc: Daniel Vetter <[email-masked]>
> ---
>  drivers/gpu/drm/drm_panel.c | 96 +++++++++++++++++++++++++++++++++++
>  include/drm/drm_panel.h     | 99 +++----------------------------------
>  2 files changed, 104 insertions(+), 91 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> index dbd5b873e8f2..9946b8d9bacc 100644
> --- a/drivers/gpu/drm/drm_panel.c
> +++ b/drivers/gpu/drm/drm_panel.c
> @@ -54,6 +54,102 @@ void drm_panel_init(struct drm_panel *panel)
>  }
>  EXPORT_SYMBOL(drm_panel_init);
>  
> +/**
> + * drm_panel_prepare - power on a panel
> + * @panel: DRM panel
> + *
> + * Calling this function will enable power and deassert any reset signals to
> + * the panel. After this has completed it is possible to communicate with any
> + * integrated circuitry via a command bus.
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int drm_panel_prepare(struct drm_panel *panel)
> +{
> +	if (panel && panel->funcs && panel->funcs->prepare)
> +		return panel->funcs->prepare(panel);
> +
> +	return panel ? -ENOSYS : -EINVAL;
> +}
> +EXPORT_SYMBOL(drm_panel_prepare);
> +
> +/**
> + * drm_panel_enable - enable a panel
> + * @panel: DRM panel
> + *
> + * Calling this function will cause the panel display drivers to be turned on
> + * and the backlight to be enabled. Content will be visible on screen after
> + * this call completes.
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int drm_panel_enable(struct drm_panel *panel)
> +{
> +	if (panel && panel->funcs && panel->funcs->enable)
> +		return panel->funcs->enable(panel);
> +
> +	return panel ? -ENOSYS : -EINVAL;
> +}
> +EXPORT_SYMBOL(drm_panel_enable);
> +
> +/**
> + * drm_panel_disable - disable a panel
> + * @panel: DRM panel
> + *
> + * This will typically turn off the panel's backlight or disable the display
> + * drivers. For smart panels it should still be possible to communicate with
> + * the integrated circuitry via any command bus after this call.
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int drm_panel_disable(struct drm_panel *panel)
> +{
> +	if (panel && panel->funcs && panel->funcs->disable)
> +		return panel->funcs->disable(panel);
> +
> +	return panel ? -ENOSYS : -EINVAL;
> +}
> +EXPORT_SYMBOL(drm_panel_disable);
> +
> +/**
> + * drm_panel_unprepare - power off a panel
> + * @panel: DRM panel
> + *
> + * Calling this function will completely power off a panel (assert the panel's
> + * reset, turn off power supplies, ...). After this function has completed, it
> + * is usually no longer possible to communicate with the panel until another
> + * call to drm_panel_prepare().
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int drm_panel_unprepare(struct drm_panel *panel)
> +{
> +	if (panel && panel->funcs && panel->funcs->unprepare)
> +		return panel->funcs->unprepare(panel);
> +
> +	return panel ? -ENOSYS : -EINVAL;
> +}
> +EXPORT_SYMBOL(drm_panel_unprepare);
> +
> +/**
> + * drm_panel_get_modes - probe the available display modes of a panel
> + * @panel: DRM panel
> + *
> + * The modes probed from the panel are automatically added to the connector
> + * that the panel is attached to.
> + *
> + * Return: The number of modes available from the panel on success or a
> + * negative error code on failure.
> + */
> +int drm_panel_get_modes(struct drm_panel *panel)
> +{
> +	if (panel && panel->funcs && panel->funcs->get_modes)
> +		return panel->funcs->get_modes(panel);
> +
> +	return panel ? -ENOSYS : -EINVAL;
> +}
> +EXPORT_SYMBOL(drm_panel_get_modes);
> +
>  /**
>   * drm_panel_add - add a panel to the global registry
>   * @panel: panel to add
> diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
> index 26377836141c..053d611656b9 100644
> --- a/include/drm/drm_panel.h
> +++ b/include/drm/drm_panel.h
> @@ -97,97 +97,6 @@ struct drm_panel {
>  	struct list_head list;
>  };
>  
> -/**
> - * drm_disable_unprepare - power off a panel
> - * @panel: DRM panel
> - *
> - * Calling this function will completely power off a panel (assert the panel's
> - * reset, turn off power supplies, ...). After this function has completed, it
> - * is usually no longer possible to communicate with the panel until another
> - * call to drm_panel_prepare().
> - *
> - * Return: 0 on success or a negative error code on failure.
> - */
> -static inline int drm_panel_unprepare(struct drm_panel *panel)
> -{
> -	if (panel && panel->funcs && panel->funcs->unprepare)
> -		return panel->funcs->unprepare(panel);
> -
> -	return panel ? -ENOSYS : -EINVAL;
> -}
> -
> -/**
> - * drm_panel_disable - disable a panel
> - * @panel: DRM panel
> - *
> - * This will typically turn off the panel's backlight or disable the display
> - * drivers. For smart panels it should still be possible to communicate with
> - * the integrated circuitry via any command bus after this call.
> - *
> - * Return: 0 on success or a negative error code on failure.
> - */
> -static inline int drm_panel_disable(struct drm_panel *panel)
> -{
> -	if (panel && panel->funcs && panel->funcs->disable)
> -		return panel->funcs->disable(panel);
> -
> -	return panel ? -ENOSYS : -EINVAL;
> -}
> -
> -/**
> - * drm_panel_prepare - power on a panel
> - * @panel: DRM panel
> - *
> - * Calling this function will enable power and deassert any reset signals to
> - * the panel. After this has completed it is possible to communicate with any
> - * integrated circuitry via a command bus.
> - *
> - * Return: 0 on success or a negative error code on failure.
> - */
> -static inline int drm_panel_prepare(struct drm_panel *panel)
> -{
> -	if (panel && panel->funcs && panel->funcs->prepare)
> -		return panel->funcs->prepare(panel);
> -
> -	return panel ? -ENOSYS : -EINVAL;
> -}
> -
> -/**
> - * drm_panel_enable - enable a panel
> - * @panel: DRM panel
> - *
> - * Calling this function will cause the panel display drivers to be turned on
> - * and the backlight to be enabled. Content will be visible on screen after
> - * this call completes.
> - *
> - * Return: 0 on success or a negative error code on failure.
> - */
> -static inline int drm_panel_enable(struct drm_panel *panel)
> -{
> -	if (panel && panel->funcs && panel->funcs->enable)
> -		return panel->funcs->enable(panel);
> -
> -	return panel ? -ENOSYS : -EINVAL;
> -}
> -
> -/**
> - * drm_panel_get_modes - probe the available display modes of a panel
> - * @panel: DRM panel
> - *
> - * The modes probed from the panel are automatically added to the connector
> - * that the panel is attached to.
> - *
> - * Return: The number of modes available from the panel on success or a
> - * negative error code on failure.
> - */
> -static inline int drm_panel_get_modes(struct drm_panel *panel)
> -{
> -	if (panel && panel->funcs && panel->funcs->get_modes)
> -		return panel->funcs->get_modes(panel);
> -
> -	return panel ? -ENOSYS : -EINVAL;
> -}
> -
>  void drm_panel_init(struct drm_panel *panel);
>  
>  int drm_panel_add(struct drm_panel *panel);
> @@ -196,6 +105,14 @@ void drm_panel_remove(struct drm_panel *panel);
>  int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector);
>  int drm_panel_detach(struct drm_panel *panel);
>  
> +int drm_panel_prepare(struct drm_panel *panel);
> +int drm_panel_unprepare(struct drm_panel *panel);
> +
> +int drm_panel_enable(struct drm_panel *panel);
> +int drm_panel_disable(struct drm_panel *panel);

Nitpicking, I would keep the order of the declarations aligned with the
definitions. prepare - enable - disable - unprepare and prepare -
unprepare - enable - disable are both fine with me, as long as they're
consistent.

Apart from that,

Reviewed-by: Laurent Pinchart <[email-masked]>

> +
> +int drm_panel_get_modes(struct drm_panel *panel);
> +
>  #if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
>  struct drm_panel *of_drm_find_panel(const struct device_node *np);
>  #else

-- 
Regards,

Laurent Pinchart

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