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

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Message-ID: <YqBK+GXrIx3XX+Km@pendragon.ideasonboard.com>
Date:   Wed, 8 Jun 2022 10:08:40 +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-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: shmobile: Use backlight helper

Hi Stephen,

On Tue, Jun 07, 2022 at 11:05:37PM +0200, Stephen Kitt wrote:
> On Tue,  7 Jun 2022 20:31:32 +0200, Stephen Kitt <steve@....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.

No worries. Would you like to submit a v2 with a better commit message ?
The patch otherwise looks good to me.

> > 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
> > ---
> >  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