linux-kernel - Re: [PATCH v2] drm: shmobile: Use backlight helper

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Date:   Tue, 21 Jun 2022 09:20:21 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Stephen Kitt <steve@....org>
Cc:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm: shmobile: Use backlight helper

Hi Stephen,

Thank you for the patch.

On Thu, Jun 16, 2022 at 07:08:21PM +0200, Stephen Kitt wrote:
> This started with work on the removal of backlight_properties'
> deprecated fb_blank field, much of which can be taken care of by using
> helper functions provided by backlight.h instead of directly accessing
> fields in backlight_properties. This patch series doesn't involve
> fb_blank, but it still seems useful to use helper functions where
> appropriate.
> 
> Instead of retrieving the backlight brightness in struct
> backlight_properties manually, and then checking whether the backlight
> should be on at all, use backlight_get_brightness() which does all
> this and insulates this from future changes.
> 
> Signed-off-by: Stephen Kitt <steve@....org>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> Cc: David Airlie <airlied@...ux.ie>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: dri-devel@...ts.freedesktop.org

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
> Changes since v1: clarified commit message, this doesn't touch fb_blank
> ---
>  drivers/gpu/drm/shmobile/shmob_drm_backlight.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/shmobile/shmob_drm_backlight.c b/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
> index f6628a5ee95f..794573badfe8 100644
> --- a/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
> +++ b/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
> @@ -18,11 +18,7 @@ static int shmob_drm_backlight_update(struct backlight_device *bdev)
>  	struct shmob_drm_connector *scon = bl_get_data(bdev);
>  	struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
>  	const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
> -	int brightness = bdev->props.brightness;
> -
> -	if (bdev->props.power != FB_BLANK_UNBLANK ||
> -	    bdev->props.state & BL_CORE_SUSPENDED)
> -		brightness = 0;
> +	int brightness = backlight_get_brightness(bdev);
>  
>  	return bdata->set_brightness(brightness);
>  }
> 
> base-commit: f2906aa863381afb0015a9eb7fefad885d4e5a56

-- 
Regards,

Laurent Pinchart