linux-kernel - Re: [PATCH 3/4] backlight: pwm_bl: compute brightness of LED linearly to human eye.

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Date:   Fri, 12 Jan 2018 11:50:52 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Enric Balletbo Serra <eballetbo@...il.com>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Doug Anderson <dianders@...gle.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Brian Norris <briannorris@...gle.com>,
        Guenter Roeck <groeck@...gle.com>,
        Lee Jones <lee.jones@...aro.org>,
        Alexandru Stan <amstan@...gle.com>, linux-leds@...r.kernel.org,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] backlight: pwm_bl: compute brightness of LED
 linearly to human eye.

On Fri, Jan 12, 2018 at 11:14:54AM +0100, Enric Balletbo Serra wrote:
> > @@ -441,6 +544,26 @@ static int pwm_backlight_probe(struct platform_device *pdev)
> >
> >         dev_dbg(&pdev->dev, "got pwm for backlight\n");
> >
> > +       if (!data->levels) {
> > +               /* Get the PWM period (in nanoseconds) */
> > +               pwm_get_state(pb->pwm, &state);
> > +
> > +               ret = pwm_backlight_brightness_default(&pdev->dev, data,
> > +                                                      state.period);
> > +               if (ret < 0) {
> > +                       dev_err(&pdev->dev,
> > +                               "failed to setup default brightness table\n");
> > +                       goto err_alloc;
> > +               }
> > +       }
> > +
> > +       for (i = 0; i <= data->max_brightness; i++)
> 
> Oops, horrible and unjustifiable mistake, missing { here :/

Well, at least you found it rather than us :-)


Daniel.