linux-kernel - Re: [PATCH 3/4] backlight: pwm_bl: Set scale type for CIE 1931 curves

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Message-ID: <20190627092453.GB2000@dell>
Date:   Thu, 27 Jun 2019 10:24:53 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-pwm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Douglas Anderson <dianders@...omium.org>,
        Brian Norris <briannorris@...omium.org>,
        Pavel Machek <pavel@....cz>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>
Subject: Re: [PATCH 3/4] backlight: pwm_bl: Set scale type for CIE 1931 curves

On Fri, 21 Jun 2019, Daniel Thompson wrote:

> On 13/06/2019 20:43, Matthias Kaehlcke wrote:
> > For backlight curves calculated with the CIE 1931 algorithm set
> > the brightness scale type property accordingly. This makes the
> > scale type available to userspace via the 'scale' sysfs attribute.
> > 
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> 
> I'd like to keep discussion on patch 2 open a bit longer (it's not part of
> the thread below patch 2 but Pavel had concerns about the sysfs interface)
> so this ack won't really push things forward but FWIW:
> 
> Acked-by: Daniel Thompson <daniel.thompson@...aro.org>

Does this depend on patch 2, or is it orthogonal?

> > ---
> >   drivers/video/backlight/pwm_bl.c | 5 ++++-
> >   1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> > index fb45f866b923..f067fe7aa35d 100644
> > --- a/drivers/video/backlight/pwm_bl.c
> > +++ b/drivers/video/backlight/pwm_bl.c
> > @@ -553,6 +553,8 @@ static int pwm_backlight_probe(struct platform_device *pdev)
> >   		goto err_alloc;
> >   	}
> > +	memset(&props, 0, sizeof(struct backlight_properties));
> > +
> >   	if (data->levels) {
> >   		/*
> >   		 * For the DT case, only when brightness levels is defined
> > @@ -591,6 +593,8 @@ static int pwm_backlight_probe(struct platform_device *pdev)
> >   			pb->levels = data->levels;
> >   		}
> > +
> > +		props.scale = BACKLIGHT_SCALE_CIE1931;
> >   	} else {
> >   		/*
> >   		 * That only happens for the non-DT case, where platform data
> > @@ -601,7 +605,6 @@ static int pwm_backlight_probe(struct platform_device *pdev)
> >   	pb->lth_brightness = data->lth_brightness * (state.period / pb->scale);
> > -	memset(&props, 0, sizeof(struct backlight_properties));
> >   	props.type = BACKLIGHT_RAW;
> >   	props.max_brightness = data->max_brightness;
> >   	bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb,
> > 
> 

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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