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

[Stephen Kitt <steve@sk2.org>]

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On Tue,  7 Jun 2022 20:31:32 +0200, Stephen Kitt <steve@sk2.org> wrote:
> backlight_properties.fb_blank is deprecated. The states it represents
> are handled by other properties; but instead of accessing those
> properties directly, drivers should use the helpers provided by
> backlight.h.

Apologies for the misleading boilerplate, this patch came about as a result
of cleaning up fb_blank usage but doesn't involve fb_blank itself.

> 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@sk2.org>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: dri-devel@lists.freedesktop.org
> ---
>  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
> 

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