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=-19.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 BD54EC4320A for ; Tue, 10 Aug 2021 17:50:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A40DD61075 for ; Tue, 10 Aug 2021 17:50:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235439AbhHJRvB (ORCPT ); Tue, 10 Aug 2021 13:51:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:34572 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236521AbhHJRt0 (ORCPT ); Tue, 10 Aug 2021 13:49:26 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1CF1A61248; Tue, 10 Aug 2021 17:41:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1628617301; bh=Q8D+xTf6pW+QKu0pELwnvTzgnHYLZci1mq3j4oWaUKs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fLvTMHeyM3Jye6SDdHDbQELAc3TME3wdBllv7Oy2W/SlEeQUalZq/Vv+iujqpPQJF mltdbmWIJn2NESiv25kWLgMvyCETHJMHKV+HMaCUb/kNEDa10k+HEXvW+fTYvWkI9V m/4A0P+w+VevZr7nCnetXPzrpnPxEbTbBWlKL4iw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Roman Li , Alex Deucher , Sasha Levin Subject: [PATCH 5.10 134/135] drm/amdgpu/display: only enable aux backlight control for OLED panels Date: Tue, 10 Aug 2021 19:31:08 +0200 Message-Id: <20210810173000.362881367@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210810172955.660225700@linuxfoundation.org> References: <20210810172955.660225700@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Alex Deucher [ Upstream commit f2ad3accefc63e72e9932e141c21875cc04beec8 ] We've gotten a number of reports about backlight control not working on panels which indicate that they use aux backlight control. A recent patch: commit 2d73eabe2984a435737498ab39bb1500a9ffe9a9 Author: Camille Cho Date: Thu Jul 8 18:28:37 2021 +0800 drm/amd/display: Only set default brightness for OLED [Why] We used to unconditionally set backlight path as AUX for panels capable of backlight adjustment via DPCD in set default brightness. [How] This should be limited to OLED panel only since we control backlight via PWM path for SDR mode in LCD HDR panel. Reviewed-by: Krunoslav Kovac Acked-by: Rodrigo Siqueira Signed-off-by: Camille Cho Signed-off-by: Alex Deucher Changes some other code to only use aux for backlight control on OLED panels. The commit message seems to indicate that PWM should be used for SDR mode on HDR panels. Do something similar for backlight control in general. This may need to be revisited if and when HDR started to get used. Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1438 Bug: https://bugzilla.kernel.org/show_bug.cgi?id=213715 Reviewed-by: Roman Li Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2162,9 +2162,9 @@ static void update_connector_ext_caps(st max_cll = conn_base->hdr_sink_metadata.hdmi_type1.max_cll; min_cll = conn_base->hdr_sink_metadata.hdmi_type1.min_cll; - if (caps->ext_caps->bits.oled == 1 || + if (caps->ext_caps->bits.oled == 1 /*|| caps->ext_caps->bits.sdr_aux_backlight_control == 1 || - caps->ext_caps->bits.hdr_aux_backlight_control == 1) + caps->ext_caps->bits.hdr_aux_backlight_control == 1*/) caps->aux_support = true; if (amdgpu_backlight == 0)