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 02635326D53; Tue, 2 Sep 2025 13:41:38 +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=1756820498; cv=none; b=ZTeIhqkHhvGF96SlH9wUfxgoSDTuzndKgR+fuqCRs8LP+7a+6qGwKPaKt50EK82Spqa9cOTMK47IK0oALPTa8eVaIms7rpeVnAbBYtZ/TN7PkMZ03JpgF/LMgPxQ4pGUsT8e6vdfsxTmsegN8wJkDF2LGn91MospS0jCSXdVYx0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756820498; c=relaxed/simple; bh=6ihEJn/wqId2Lscq1vHIBqzkiWtZADhWKiJDnGZn5tw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RhSGSe2BEXII6VgIvP/FL6s7yHS5LmWTMfEwwB8meD6CFXqiBL0NGtcppBRJZ6Rlr/cuWawZb8FJ94NnaGaRudFRnYm/gbfydEmmFLH88UXkSBh0mrpycHHz8AVyWjOy6mwQ9Dq11umA6oRucyBzZRyE/weP/c46N85cNZaCpP8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=b8Xqakuh; 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="b8Xqakuh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 81229C4CEED; Tue, 2 Sep 2025 13:41:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756820497; bh=6ihEJn/wqId2Lscq1vHIBqzkiWtZADhWKiJDnGZn5tw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=b8XqakuhgQNgA0zJpDBKx+VfsSL5m3BE78sQbGq5mk4DtPK//CV5Kb+Swo83H1QXP 7g+8OBBm2bu1GSca//H9rekhOEhoH/gGmW9vfq3DAUHaGXhycki/Mj6r3yc4F97Em/ g8XQ35p3UUeuVUwJPfQckrlfFRqPMlxmSCHR+CSs= 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 6.1 49/50] Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS" Date: Tue, 2 Sep 2025 15:21:40 +0200 Message-ID: <20250902131932.457260541@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250902131930.509077918@linuxfoundation.org> References: <20250902131930.509077918@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Imre Deak This reverts commit 4f546a77671076a0a49c08b4c6a7d0888d72f7d2 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; }