linux-kernel - Re: [PATCH v2] ARM: dts: rockchip: Use interpolated brightness tables for veyron

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Date:   Thu, 10 Oct 2019 23:23:48 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Douglas Anderson <dianders@...omium.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] ARM: dts: rockchip: Use interpolated brightness tables for veyron

Am Donnerstag, 3. Oktober 2019, 18:41:52 CEST schrieb Matthias Kaehlcke:
> Use interpolated brightness tables (added by commit 573fe6d1c25
> ("backlight: pwm_bl: Linear interpolation between
> brightness-levels") for veyron, instead of specifying every single
> step. Some devices/panels have intervals that are smaller than
> the specified 'num-interpolated-steps', the driver interprets
> these intervals as a single step.
> 
> Another option would be to switch to a perceptual brightness curve
> (CIE 1931), with the caveat that it would change the behavior of
> the backlight. Also the concept of a minimum brightness level is
> currently not supported for CIE 1931 curves.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>

applied for 5.5

Thanks
Heiko