From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75147C4360C for ; Thu, 10 Oct 2019 21:23:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4A42320B7C for ; Thu, 10 Oct 2019 21:23:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727315AbfJJVX4 (ORCPT ); Thu, 10 Oct 2019 17:23:56 -0400 Received: from gloria.sntech.de ([185.11.138.130]:33688 "EHLO gloria.sntech.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725867AbfJJVXz (ORCPT ); Thu, 10 Oct 2019 17:23:55 -0400 Received: from ip5f5a6266.dynamic.kabel-deutschland.de ([95.90.98.102] helo=phil.localnet) by gloria.sntech.de with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1iIfuX-000786-Im; Thu, 10 Oct 2019 23:23:49 +0200 From: Heiko Stuebner 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 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> In-Reply-To: <20191003094137.v2.1.Ic9fd698810ea569c465350154da40b85d24f805b@changeid> References: <20191003094137.v2.1.Ic9fd698810ea569c465350154da40b85d24f805b@changeid> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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