From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1741131A062; Tue, 2 Sep 2025 13:29:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756819785; cv=none; b=YJ01lNPmSsPYPf+lZFrOyKdAbO/Qj9Eaqn7t4exH0U1B3VN7oBlC5v63pHrbG0S0EkqptNY0t9+vofwXnSw72RLfE0MkI+WMMvEQZaUM14b1GSKTNE2DhyUPFVei8Lg7ZHfymTsWZKUfuAuChONYXoB+f2RBjMLzSNKJkAIVQzc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756819785; c=relaxed/simple; bh=lw+2f1hzugIWKiSdRUqh3aCTm8vSpr9XFbb2GjRXs1Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=urhwzX8+kxuZpJ46e7nJekQOrr+gOFD8wlwsytGNW0p1+DjRGHc3y11rPLWEpyPzsTnFZHTlOiRRnJXGNeNsPnMSJvqJJn0W2bdblTsrwNgXW7wV6cplpWWNvF/7XJnzGF+7Nji+lu8b+wJYA+MIY3CFl1I/WPOw0iDivHQiwkc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=TJP6ul3d; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="TJP6ul3d" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4137EC4CEED; Tue, 2 Sep 2025 13:29:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756819784; bh=lw+2f1hzugIWKiSdRUqh3aCTm8vSpr9XFbb2GjRXs1Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TJP6ul3d4sFJmGvDImEGVjRG2Qp21m8rev7ib7WhCxGbXAzMJR9CiEDSGlxWBX2HE ORkDzvo6JwwN54bMuhEvCGXYe8T6feHwzFVR/M5IUydXrl6sXvinSftsqjUHNJ1AH9 kkzaQz1rHY/q2DLpXSFIr2fKF1QA+0a+TZRXdNe0= 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 6.16 139/142] Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS" Date: Tue, 2 Sep 2025 15:20:41 +0200 Message-ID: <20250902131953.603872091@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250902131948.154194162@linuxfoundation.org> References: <20250902131948.154194162@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Imre Deak This reverts commit 944e732be9c3a33e64e9fb0f5451a37fc252ddfc 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 @@ -725,7 +725,7 @@ 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; }