linux-kernel - Re: [PATCH RESEND 1/4] backlight: aat2870: Use backlight helper

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Date:   Mon, 9 Jan 2023 10:27:13 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Stephen Kitt <steve@....org>, Lee Jones <lee@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>, linux-fbdev@...r.kernel.org,
        Helge Deller <deller@....de>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH RESEND 1/4] backlight: aat2870: Use backlight helper

On Fri, Jan 06, 2023 at 06:43:36PM +0100, Daniel Vetter wrote:
> On Fri, Jan 06, 2023 at 05:48:52PM +0100, Stephen Kitt wrote:
> > 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>
>
> Lee/Daniel, will you pick these up, or should I smash them all into
> drm-misc-next for 6.3?

Outside of holiday, Lee usually hoovers up the backlight patches (and
negotiates about who merges what).


Daniel.


> > ---
> >  drivers/video/backlight/aat2870_bl.c | 7 +------
> >  1 file changed, 1 insertion(+), 6 deletions(-)
> >
> > diff --git a/drivers/video/backlight/aat2870_bl.c b/drivers/video/backlight/aat2870_bl.c
> > index a7af9adafad6..1cbb303e9c88 100644
> > --- a/drivers/video/backlight/aat2870_bl.c
> > +++ b/drivers/video/backlight/aat2870_bl.c
> > @@ -59,7 +59,7 @@ static int aat2870_bl_update_status(struct backlight_device *bd)
> >  	struct aat2870_bl_driver_data *aat2870_bl = bl_get_data(bd);
> >  	struct aat2870_data *aat2870 =
> >  			dev_get_drvdata(aat2870_bl->pdev->dev.parent);
> > -	int brightness = bd->props.brightness;
> > +	int brightness = backlight_get_brightness(bd);
> >  	int ret;
> >
> >  	if ((brightness < 0) || (bd->props.max_brightness < brightness)) {
> > @@ -70,11 +70,6 @@ static int aat2870_bl_update_status(struct backlight_device *bd)
> >  	dev_dbg(&bd->dev, "brightness=%d, power=%d, state=%d\n",
> >  		 bd->props.brightness, bd->props.power, bd->props.state);
> >
> > -	if ((bd->props.power != FB_BLANK_UNBLANK) ||
> > -			(bd->props.state & BL_CORE_FBBLANK) ||
> > -			(bd->props.state & BL_CORE_SUSPENDED))
> > -		brightness = 0;
> > -
> >  	ret = aat2870->write(aat2870, AAT2870_BLM,
> >  			     (u8)aat2870_brightness(aat2870_bl, brightness));
> >  	if (ret < 0)
> > --
> > 2.30.2
> >
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch