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=-15.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=unavailable 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 629ABC11F65 for ; Wed, 30 Jun 2021 04:30:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 43BFD610A6 for ; Wed, 30 Jun 2021 04:30:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233279AbhF3Ebp convert rfc822-to-8bit (ORCPT ); Wed, 30 Jun 2021 00:31:45 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:54250 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230200AbhF3Ebo (ORCPT ); Wed, 30 Jun 2021 00:31:44 -0400 Received: from [222.129.34.206] (helo=[192.168.1.18]) by youngberry.canonical.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1lyRqb-0003QF-SV; Wed, 30 Jun 2021 04:29:14 +0000 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, Greg KH , stable@vger.kernel.org References: <20210519095305.47133-1-aaron.ma@canonical.com> <57b373372cb64e8a48d12e033a23e7711332b0ec.camel@redhat.com> From: Aaron Ma Subject: Re: [PATCH] drm/i915: Force DPCD backlight mode for Samsung 16727 panel Message-ID: <33f42229-780f-9b4e-69db-db3fad32bf3a@canonical.com> Date: Wed, 30 Jun 2021 12:29:05 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <57b373372cb64e8a48d12e033a23e7711332b0ec.camel@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8BIT Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Greg: Could this patch get a chance to be applied on stable kernel? It only for 5.11- kernel, not for Linus' tree. Thanks, Aaron On 5/20/21 12:27 AM, Lyude Paul wrote: > Seems reasonable to me: > > Reviewed-by: Lyude Paul > > On Wed, 2021-05-19 at 17:53 +0800, Aaron Ma wrote: >> 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