Re: [PATCH v2] drm: shmobile: Use backlight helper

[Kieran Bingham]

Quoting Stephen Kitt (2022-06-16 18:08:21)
> 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@xxxxxxx>
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Cc: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>


Hi Stephen,

This looks reasonable to me too.

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>

> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> ---
> 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
> -- 
> 2.30.2
>