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=-6.3 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 ED184C4363D for ; Wed, 23 Sep 2020 22:13:56 +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 91D6E235FD for ; Wed, 23 Sep 2020 22:13:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="fap5Ksbc" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 91D6E235FD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 143086EA08; Wed, 23 Sep 2020 22:13:56 +0000 (UTC) Received: from mail-qk1-x741.google.com (mail-qk1-x741.google.com [IPv6:2607:f8b0:4864:20::741]) by gabe.freedesktop.org (Postfix) with ESMTPS id 22FCF6EA08 for ; Wed, 23 Sep 2020 22:13:54 +0000 (UTC) Received: by mail-qk1-x741.google.com with SMTP id c2so1326869qkf.10 for ; Wed, 23 Sep 2020 15:13:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=9WNptpv06UneB7aZbM0n/Fv0ZV97+q6TI709ywtcb8w=; b=fap5KsbcIGA+HiEA8ar86MK/968DlLJpDSb+0ybjnlvgX68AgZUWu5tHYqyHBCC//+ t1hVlz6ZbdMrBkAfZ3jVIcEXDfiuaq9phlWIw4bdUNpRAHorVEc+7r1AgvgpIwyQ4UYq VyzVUZtHaNCczzVVE3jh7S8tv5HEij5UXXsOR1bXtSWAhVCXt6F5Xyn90iNZ6fROz6tn rmztesTRWvGA+lFqTOV07/H2uIi4Efshs5J5E5CsfdAGT5jn8vDv7OumgQB0hqvpaM5h 1zhnGREfeBbXa5/1HK6Ttx1LWL72nNY8tuOVMK8w6s+YG3rDT93z9nOOntrilpqK6+uT r0Cw== 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=9WNptpv06UneB7aZbM0n/Fv0ZV97+q6TI709ywtcb8w=; b=CBhf/7H4iAb7zcU5n5z/TItv3DQzDLBCm3ajz61XPlDifiSdynaE0wB8wMscH1Vsec u5tLy2zliWGLD9eUX1C2UETBjaFQiGgp6LG9OQuYJvnFS7tTrbxlVSsNeQ7LSYYprgvh 8K3+u64FlvrK9nEQ3JzHnOevAwVlezBACCQFVInt5hx84obPxYWPaHD/7ORdgTeWbELK uq8PrgVJ+w2I91WOiNoyNV8J/gv8zv2lkR9bEoEMIxQ0Ul8cJ3bBbyI2zFydi+PeI/yI 7O7sWDMXrmph5D9BSpxgAZV5NV2EqamhCFHBb2fLyuRXBI5on2dUZCedAO3/+H9LKiko 96JA== X-Gm-Message-State: AOAM533l5zEorwK4rwdHiLEbJGUDfllHd6HdLbYmo/b6fDTYvuiCsQC4 Y0Du9GUjbV5Z7U1tUG+wVv3A8E6UAdnAyg== X-Google-Smtp-Source: ABdhPJy7IOGIVqm383pdXqOoM4hXgxSJWW+pfRLRPfFmzdMkO/1lZbT8fykexbv465e/9QY6BJe07w== X-Received: by 2002:a37:a1cb:: with SMTP id k194mr2073867qke.354.1600899232902; Wed, 23 Sep 2020 15:13:52 -0700 (PDT) Received: from cheekon.pramanik.com ([2604:2000:2f80:1100:5a2:1440:32f3:3d13]) by smtp.gmail.com with ESMTPSA id n203sm843281qke.66.2020.09.23.15.13.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Sep 2020 15:13:52 -0700 (PDT) From: Satadru Pramanik To: intel-gfx@lists.freedesktop.org Date: Wed, 23 Sep 2020 18:13:11 -0400 Message-Id: <20200923221312.2418628-1-satadru@gmail.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Subject: [Intel-gfx] [RFC PATCH 0/1] Remove DPCD Aux Backlight Control PWM_PIN check X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" The Google Pixel Slate/Nocturne device uses a DPCD backlight which requires Aux Backlight Control to be enabled. This is enabled in the ChromeOS kernel trees via disabling the PWM_PIN check and also an extended heuristic, which was upstreamed in 2017, but reverted shortly thereafter due to a regression on a Thinkpad X1 Carbon 4th Gen as per https://bugs.freedesktop.org/show_bug.cgi?id=101619 I'm hoping that there is a way to remove that check and not cause problems for other machines, as otherwise the backlight is nonfunctional for nocturne, (and possibly for other related machines such as the eve Pixelbook as well.) Satadru Pramanik (1): Remove DPCD Aux Backlight Control PWM_PIN check drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) -- 2.27.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx