From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heiko Stuebner Subject: Re: [PATCH v2] ARM: dts: rockchip: Use interpolated brightness tables for veyron Date: Thu, 10 Oct 2019 23:23:48 +0200 Message-ID: <3947291.Wl2KGcTfji@phil> References: <20191003094137.v2.1.Ic9fd698810ea569c465350154da40b85d24f805b@changeid> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: <20191003094137.v2.1.Ic9fd698810ea569c465350154da40b85d24f805b@changeid> Sender: linux-kernel-owner@vger.kernel.org To: Matthias Kaehlcke Cc: Rob Herring , Mark Rutland , Douglas Anderson , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org 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 applied for 5.5 Thanks Heiko