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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 5131BCA1005 for ; Tue, 2 Sep 2025 11:44:08 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id DC90E10E67B; Tue, 2 Sep 2025 11:44:07 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="sRQkbhhY"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id 057AD10E67B; Tue, 2 Sep 2025 11:44:06 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id ADD4060206; Tue, 2 Sep 2025 11:44:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E614AC4CEF5; Tue, 2 Sep 2025 11:44:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756813445; bh=DaJ6EJatQGC+ytu6Zrl/0Pk26QWT1XYEoFcww77ugFI=; h=Subject:To:Cc:From:Date:In-Reply-To:From; b=sRQkbhhY2dpH3gTZiqeCInER2iVnTwFZtIfqvaq2phUEXi+y6PrF7dLHETzR7ihxl u5k3ZXOc75ac9MgoI3Lmpog/W7jY+8tFd2HlV6LqUlG27yL9ZbR7ubs+3i+s/M5hWd aPU/72zgQAPLyB00V8y3pKW1JBt3SnhH4EcNY7DU= Subject: Patch "Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS"" has been added to the 5.4-stable tree To: dri-devel@lists.freedesktop.org, imre.deak@intel.com, intel-gfx@lists.freedesktop.org, sashal@kernel.org Cc: From: Date: Tue, 02 Sep 2025 13:44:01 +0200 In-Reply-To: <20250828174932.414566-1-imre.deak@intel.com> Message-ID: <2025090201-unsafe-energize-b9cd@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit X-stable: commit X-Patchwork-Hint: ignore 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: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" This is a note to let you know that I've just added the patch titled Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS" to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: revert-drm-dp-change-aux-dpcd-probe-address-from-dpcd_rev-to-lane0_1_status.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From imre.deak@intel.com Tue Sep 2 13:42:52 2025 From: Imre Deak Date: Thu, 28 Aug 2025 20:49:26 +0300 Subject: Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS" To: Cc: , , Sasha Levin Message-ID: <20250828174932.414566-1-imre.deak@intel.com> From: Imre Deak This reverts commit 2402adce8da4e7396b63b5ffa71e1fa16e5fe5c4 which is commit a40c5d727b8111b5db424a1e43e14a1dcce1e77f upstream. The upstream commit a40c5d727b8111b5db424a1e43e14a1dcce1e77f ("drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS") the reverted commit backported causes a regression, on one eDP panel at least resulting in display flickering, described in detail at the Link: below. The issue fixed by the upstream commit will need a different solution, revert the backport for now. Cc: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org Cc: Sasha Levin Link: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14558 Signed-off-by: Imre Deak --- drivers/gpu/drm/drm_dp_helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -280,7 +280,7 @@ ssize_t drm_dp_dpcd_read(struct drm_dp_a * We just have to do it before any DPCD access and hope that the * monitor doesn't power down exactly after the throw away read. */ - ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, DP_LANE0_1_STATUS, buffer, + ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, DP_DPCD_REV, buffer, 1); if (ret != 1) goto out; Patches currently in stable-queue which might be from imre.deak@intel.com are queue-5.4/revert-drm-dp-change-aux-dpcd-probe-address-from-dpcd_rev-to-lane0_1_status.patch