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 395D1CA1009 for ; Tue, 2 Sep 2025 12:35:07 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7D5BC10E6B5; Tue, 2 Sep 2025 12:35:06 +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="OojGcCfG"; 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 B22A910E6B2; Tue, 2 Sep 2025 12:35:05 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id B7E146020D; Tue, 2 Sep 2025 12:35:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF3C3C4CEED; Tue, 2 Sep 2025 12:35:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756816504; bh=m9d/Q5uOT2VS5QNyb+GyKhdNjIgRLA4iyzPmJPCtyO4=; h=Subject:To:Cc:From:Date:From; b=OojGcCfGsMvOPwnSghaKTef7Oyzk3Apqg2XFGAxSmRz50DugktAkIiztasIGIVNk7 9OrZZXmZvJMUHPMM5xORLk096x2URDcy4LxuTKPTJn2iIqX9QWjRm2biBD3e/2tDzf 87wfE6PGre7fss9dc11fBcUoQtXS+K1/eKTFR9Rw= Subject: Patch "Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS"" has been added to the 6.12-stable tree To: dri-devel@lists.freedesktop.org, gregkh@linuxfoundation.org, imre.deak@intel.com, intel-gfx@lists.freedesktop.org, sashal@kernel.org Cc: From: Date: Tue, 02 Sep 2025 14:34:50 +0200 Message-ID: <2025090250-unhelpful-line-9166@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 6.12-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-6.12 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 13:50:59 2025 From: Imre Deak Date: Thu, 28 Aug 2025 20:49:29 +0300 Subject: Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS" To: Cc: , , Sasha Levin From: Imre Deak This reverts commit 3c778a98bee16b4c7ba364a0101ee3c399a95b85 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 Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/display/drm_dp_helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -664,7 +664,7 @@ ssize_t drm_dp_dpcd_read(struct drm_dp_a * monitor doesn't power down exactly after the throw away read. */ if (!aux->is_remote) { - ret = drm_dp_dpcd_probe(aux, DP_LANE0_1_STATUS); + ret = drm_dp_dpcd_probe(aux, DP_DPCD_REV); if (ret < 0) return ret; } Patches currently in stable-queue which might be from imre.deak@intel.com are queue-6.12/revert-drm-dp-change-aux-dpcd-probe-address-from-dpcd_rev-to-lane0_1_status.patch