Subject: Re: [PATCH v1 13/26] drm/panel: lvds: use drm_panel backlight support

From: Laurent Pinchart <[email-masked]>
Date: Tue, 3 Dec 2019 09:16:06 +0200

Hi Sam,

Thank you for the patch.

On Mon, Dec 02, 2019 at 08:32:17PM +0100, Sam Ravnborg wrote:
> Use the backlight support in drm_panel to simplify the driver
> 
> Signed-off-by: Sam Ravnborg <[email-masked]>
> Cc: Thierry Reding <[email-masked]>
> Cc: Sam Ravnborg <[email-masked]>

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

> ---
>  drivers/gpu/drm/panel/panel-lvds.c | 40 ++++--------------------------
>  1 file changed, 5 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c
> index 5e40b674bb15..5ce3f4a2b7a1 100644
> --- a/drivers/gpu/drm/panel/panel-lvds.c
> +++ b/drivers/gpu/drm/panel/panel-lvds.c
> @@ -8,7 +8,6 @@
>   * Contact: Laurent Pinchart ([email-masked])
>   */
>  
> -#include <linux/backlight.h>
>  #include <linux/gpio/consumer.h>
>  #include <linux/module.h>
>  #include <linux/of_platform.h>
> @@ -34,7 +33,6 @@ struct panel_lvds {
>  	unsigned int bus_format;
>  	bool data_mirror;
>  
> -	struct backlight_device *backlight;
>  	struct regulator *supply;
>  
>  	struct gpio_desc *enable_gpio;
> @@ -46,19 +44,6 @@ static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel)
>  	return container_of(panel, struct panel_lvds, panel);
>  }
>  
> -static int panel_lvds_disable(struct drm_panel *panel)
> -{
> -	struct panel_lvds *lvds = to_panel_lvds(panel);
> -
> -	if (lvds->backlight) {
> -		lvds->backlight->props.power = FB_BLANK_POWERDOWN;
> -		lvds->backlight->props.state |= BL_CORE_FBBLANK;
> -		backlight_update_status(lvds->backlight);
> -	}
> -
> -	return 0;
> -}
> -
>  static int panel_lvds_unprepare(struct drm_panel *panel)
>  {
>  	struct panel_lvds *lvds = to_panel_lvds(panel);
> @@ -93,19 +78,6 @@ static int panel_lvds_prepare(struct drm_panel *panel)
>  	return 0;
>  }
>  
> -static int panel_lvds_enable(struct drm_panel *panel)
> -{
> -	struct panel_lvds *lvds = to_panel_lvds(panel);
> -
> -	if (lvds->backlight) {
> -		lvds->backlight->props.state &= ~BL_CORE_FBBLANK;
> -		lvds->backlight->props.power = FB_BLANK_UNBLANK;
> -		backlight_update_status(lvds->backlight);
> -	}
> -
> -	return 0;
> -}
> -
>  static int panel_lvds_get_modes(struct drm_panel *panel,
>  				struct drm_connector *connector)
>  {
> @@ -132,10 +104,8 @@ static int panel_lvds_get_modes(struct drm_panel *panel,
>  }
>  
>  static const struct drm_panel_funcs panel_lvds_funcs = {
> -	.disable = panel_lvds_disable,
>  	.unprepare = panel_lvds_unprepare,
>  	.prepare = panel_lvds_prepare,
> -	.enable = panel_lvds_enable,
>  	.get_modes = panel_lvds_get_modes,
>  };
>  
> @@ -242,10 +212,6 @@ static int panel_lvds_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	lvds->backlight = devm_of_find_backlight(lvds->dev);
> -	if (IS_ERR(lvds->backlight))
> -		return PTR_ERR(lvds->backlight);
> -
>  	/*
>  	 * TODO: Handle all power supplies specified in the DT node in a generic
>  	 * way for panels that don't care about power supply ordering. LVDS
> @@ -257,6 +223,10 @@ static int panel_lvds_probe(struct platform_device *pdev)
>  	drm_panel_init(&lvds->panel, lvds->dev, &panel_lvds_funcs,
>  		       DRM_MODE_CONNECTOR_LVDS);
>  
> +	ret = drm_panel_of_backlight(&lvds->panel);
> +	if (ret)
> +		return ret;
> +
>  	ret = drm_panel_add(&lvds->panel);
>  	if (ret < 0)
>  		return ret;
> @@ -271,7 +241,7 @@ static int panel_lvds_remove(struct platform_device *pdev)
>  
>  	drm_panel_remove(&lvds->panel);
>  
> -	panel_lvds_disable(&lvds->panel);
> +	drm_panel_disable(&lvds->panel);
>  
>  	return 0;
>  }

-- 
Regards,

Laurent Pinchart

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