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 D7B19CA1005 for ; Tue, 2 Sep 2025 13:39:30 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E2C1B10E703; Tue, 2 Sep 2025 13:39:27 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="NYIMpBUx"; 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 8BB7A10E700; Tue, 2 Sep 2025 13:39:26 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id A2B5860212; Tue, 2 Sep 2025 13:39:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0EDEC4CEF4; Tue, 2 Sep 2025 13:39:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756820365; bh=MfXlxgU/pB7sWuRfIrTK6XK/eqbcQRhIjEeDlX+Uz08=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NYIMpBUxQWUGesa9jLG7n7lw3JnV5ERWhLhYhj8l4TkJ7gG9HUqgUC/fyPktiaXvF qVhwAlSLl44IZwuF/OwAw51ZPpH1txas8Rc/aQx3QR6gFTUprbvNQrdxzhzSLQSdL5 mlEC5J85nuRzn262TeTdIB5KmtVN9JW5zR/43dzQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Sasha Levin , Imre Deak Subject: [PATCH 6.6 74/75] Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS" Date: Tue, 2 Sep 2025 15:21:26 +0200 Message-ID: <20250902131938.008357049@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250902131935.107897242@linuxfoundation.org> References: <20250902131935.107897242@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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" 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Imre Deak This reverts commit 65e46aeaf84aa88539bcff6b8077e05fbd0700da 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 @@ -663,7 +663,7 @@ 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; }