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=-6.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 A786CC5517A for ; Thu, 22 Oct 2020 07:28:26 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3321220848 for ; Thu, 22 Oct 2020 07:28:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="f48hBtEY" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3321220848 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0E1AE6F524; Thu, 22 Oct 2020 07:28:20 +0000 (UTC) Received: from mail-pj1-x1041.google.com (mail-pj1-x1041.google.com [IPv6:2607:f8b0:4864:20::1041]) by gabe.freedesktop.org (Postfix) with ESMTPS id EA66F6E34B for ; Thu, 22 Oct 2020 05:05:13 +0000 (UTC) Received: by mail-pj1-x1041.google.com with SMTP id a17so365909pju.1 for ; Wed, 21 Oct 2020 22:05:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=br1VG/AftR5rvhAmwlJkFmu6wT77im0wqYMY63lXCPc=; b=f48hBtEYiQ9cumyN91pZln9WRYzYGIagC8IaqGZt02+O2MHl6eQhg0BtJ9+cg1Lz5h o78FtZXmTE3jBKH3YGJw6UO0d0jZFwtKCoYPkexfnY1SZ/dfXt7VslCJZM/bN6IMdzvi 1GjVCtofogBD1D5SMd8g0By60jOJ/X9Pviva4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=br1VG/AftR5rvhAmwlJkFmu6wT77im0wqYMY63lXCPc=; b=RwXrqEd/XgObl99FqzZR2HlqZSktzC57hGIDLDRlEhiYEJr57IvitBEFNLNNAalxny dUy137K/bRS9T/sYNN10p9aYxxkA5+MF2kguU2GQqnQX1N3wq8hPCydEfdganfVGckqO vx79u5a2hfOn5pfngirkDm5juboGXVBwbW8etrdR1+986ZOPrraQOxa4LJo96YQuKhYs w6EtKtrJ8aN8mDPE0VI0V19ErFPX68YQJIUTkZjEkBnvS7WvajvyGGPrx9dxpZ60SKlg BIjAtlvLOdVsb6ZP3NgdFP4z8oFtdK9HAijtlYX90636J0SUa0ZSJ/IXrLL5fPbYahXj T7Og== X-Gm-Message-State: AOAM532We8Np1wyImXsk2dB9FE23ikZ/sgTnj1gEXK/jhKBCW6LQMQIO JnfTFlNtok46jz3Jop7wKDSogw== X-Google-Smtp-Source: ABdhPJymcPyyQm+Vwkk6bRyWkhQZdrrKBm+8kHDpsoJwQTQghvs0I0e+UpqN3Vxv1JCNbjDoQlFwsw== X-Received: by 2002:a17:902:ab89:b029:d5:b297:2cc1 with SMTP id f9-20020a170902ab89b02900d5b2972cc1mr765458plr.7.1603343113453; Wed, 21 Oct 2020 22:05:13 -0700 (PDT) Received: from alex-desktop.lan (c-73-63-253-164.hsd1.ca.comcast.net. [73.63.253.164]) by smtp.gmail.com with ESMTPSA id q16sm394954pfu.206.2020.10.21.22.05.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 22:05:12 -0700 (PDT) From: Alexandru Stan To: Heiko Stuebner , Rob Herring , Andy Gross , Bjorn Andersson , Thierry Reding , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Lee Jones , Daniel Thompson , Jingoo Han , Bartlomiej Zolnierkiewicz Subject: [PATCH v3 0/3] PWM backlight interpolation adjustments Date: Wed, 21 Oct 2020 22:04:42 -0700 Message-Id: <20201022050445.930403-1-amstan@chromium.org> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 X-Mailman-Approved-At: Thu, 22 Oct 2020 07:27:48 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-fbdev@vger.kernel.org, Alexandru Stan , linux-pwm@vger.kernel.org, linux-arm-msm@vger.kernel.org, Douglas Anderson , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, Matthias Kaehlcke , Enric Balletbo i Serra , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" I was trying to adjust the brightness-levels for the trogdor boards: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2291209 Like on a lot of panels, trogdor's low end needs to be cropped, and now that we have the interpolation stuff I wanted to make use of it and bake in even the curve that's customary to have on chromebooks. I found the current behavior of the pwm_bl driver a little unintuitive and non-linear. See patch 1 for a suggested fix for this. A few veyron dts files were relying on this (perhaps weird) behavior. Those devices also want a minimum brightness like trogdor, so changed them to use the new way. Finally, given that trogdor's dts is part of linux-next now, add the brightness-levels to it, since that's the original reason I was looking at this. Changes in v3: - Reordered patches, since both dts changes will work just fine even before the driver change. - Rewrote a bit of the commit message to describe the new policy, as Daniel suggested. - Removed redundant s64 for something that's always positive Changes in v2: - Fixed type promotion in the driver - Removed "backlight: pwm_bl: Artificially add 0% during interpolation", userspace works just fine without it because it already knows how to use bl_power for turning off the display. - Added brightness-levels to trogdor as well, now the dts is upstream. Alexandru Stan (3): ARM: dts: rockchip: veyron: Remove 0 point from brightness-levels arm64: dts: qcom: trogdor: Add brightness-levels backlight: pwm_bl: Fix interpolation arch/arm/boot/dts/rk3288-veyron-jaq.dts | 2 +- arch/arm/boot/dts/rk3288-veyron-minnie.dts | 2 +- arch/arm/boot/dts/rk3288-veyron-tiger.dts | 2 +- arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 9 +++ drivers/video/backlight/pwm_bl.c | 70 +++++++++----------- 5 files changed, 43 insertions(+), 42 deletions(-) -- 2.28.0 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel