Received: by 2002:a05:6520:4211:b029:f4:110d:56bc with SMTP id o17csp1547479lkv; Wed, 19 May 2021 12:29:12 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyqnlmryR5gw1EPgNvvIdxT+NcSs2rsIFP71O47KXCAIK4E8uJI2CVaASs8qepEpsI7Ax+v X-Received: by 2002:a05:6402:100c:: with SMTP id c12mr652441edu.165.1621452552673; Wed, 19 May 2021 12:29:12 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1621452552; cv=none; d=google.com; s=arc-20160816; b=NdGHPVKZF26s2G+vUCBKYK7uJDV2gTnOC9SMR6BidM12nbcGYal9NXP2hDAVcigJzE pQ/tXvaLe+ABkl9PWN0PoZBaRfhC/cP/ODnlNa4WuQLesN8qgM8wKqvqQXguaYh0dPXe 0/1pHVlrRZXMehXCSIllw1Pyclr/Qfe3o9VBFpqlDF5YRgkZkVGSXxOSdZ+wjm6a+KnB sXXd7PK+WgTkosZYpSYKw+4g8AGHFkggCBWWqVaqtVoAw5+Y+kbwV0JV223ldvt1TMxH 4TN4wNRv2KIKUbV2dVTx5w7+jhL8b7N+7xHEMehwmF2sgkIEa2jIq4IiNdk6lPmRni4E sCuw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :message-id:date:subject:to:from; bh=IPAYpB6WV+Xj1nHF6H+9m6XhqOBKs7oho/XNfRGY9kk=; b=Eyoqr971GkQJoWKSjNtXGB2VerJL92TroVvrgKNpj6NZExie3D+vcteELXZHZkQKeg UFjpp1tVU61JBy2Xz/2OwSIEMi/aVZkkpc3+mTMl+RULO3EzM4nwCHzU2doqyqkq0xAm snrDWNpJYavff8PJM3/Kcl7/K71tXAPNxugM2IR5gMVCm5Cf4b+Fl05eGFgVkCqrLR8T PtH3Yat1ijiGc61Hfz4t34hlCx42nBNY/npLjKn58MHla4HHon9DdACt5AMdsrkZbsI+ lFhNrLddpYGxPcM4fNbdIzipt/27yylxKIVY/43j7FGG0Rr4UoF+dGWEUgungtWdjZsQ B4ew== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=canonical.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id q17si386023ejj.672.2021.05.19.12.28.48; Wed, 19 May 2021 12:29:12 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=canonical.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347234AbhESJy4 (ORCPT + 99 others); Wed, 19 May 2021 05:54:56 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:52994 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347969AbhESJyt (ORCPT ); Wed, 19 May 2021 05:54:49 -0400 Received: from [222.129.39.165] (helo=localhost.localdomain) by youngberry.canonical.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1ljItC-0005Op-D3; Wed, 19 May 2021 09:53:19 +0000 From: Aaron Ma To: lyude@redhat.com, jani.nikula@intel.com, airlied@linux.ie, maarten.lankhorst@linux.intel.com, mripard@kernel.org, daniel@ffwll.ch, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, aaron.ma@canonical.com Subject: [PATCH] drm/i915: Force DPCD backlight mode for Samsung 16727 panel Date: Wed, 19 May 2021 17:53:05 +0800 Message-Id: <20210519095305.47133-1-aaron.ma@canonical.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Another Samsung OLED panel needs DPCD to get control of backlight. Kernel 5.12+ support the backlight via: commit: <4a8d79901d5b> ("drm/i915/dp: Enable Intel's HDR backlight interface (only SDR for now)") Only make backlight work on lower versions of kernel. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/3474 Cc: stable@vger.kernel.org # 5.11- Signed-off-by: Aaron Ma --- drivers/gpu/drm/drm_dp_helper.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 5bd0934004e3..7b91d8a76cd6 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -1960,6 +1960,7 @@ static const struct edid_quirk edid_quirk_list[] = { { MFG(0x4d, 0x10), PROD_ID(0xe6, 0x14), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) }, { MFG(0x4c, 0x83), PROD_ID(0x47, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) }, { MFG(0x09, 0xe5), PROD_ID(0xde, 0x08), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) }, + { MFG(0x4c, 0x83), PROD_ID(0x57, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) }, }; #undef MFG -- 2.25.1