linux-kernel - Re: [PATCH v3 0/9] leds: lm3692x: Allow to set ovp and brigthness mode

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Date:   Tue, 25 Feb 2020 11:19:35 +0100
From:   Pavel Machek <pavel@....cz>
To:     Guido Günther <agx@...xcpu.org>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/9] leds: lm3692x: Allow to set ovp and brigthness
 mode

Hi!

> > > Patches are against next-20191220.
> > 
> > I applied everything but the "exponential" changes and the last
> > one. I'll apply the last one if I get version that applies on top of
> > leds tree.
> 
> Thanks! Can I do anything to get the exponential part in? Is it because
> you want the exponential mode to move to the backlight binding?

You'd have to do some serious convincing, explaining why we absolutely
need the exponential stuff.

Most devices today use linear brightness, and userspace needs to know
the relation, especially for RGB stuff.

You can set bigger max-brightness, and then do in-driver conversion to
use full dynamic brightness range...?

Best regards,

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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