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 22EDC30BF79; Tue, 2 Sep 2025 13:34:58 +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=1756820098; cv=none; b=ZTsshETTb3iAcn//dZUc4ZA/Agfe8N8c0ibKsjlQXZ5+SepFHoKmBjdDRsFjyoI4jWSKwJg5yvmgasPy23eBE74B+rY0Uu03U7iJfuV/ukAhDiZVhP1gqQpTOXcWRngjpG603SHQ/RxxshX7NZSIiHUAbDhUREu0BL7kReK2H84= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756820098; c=relaxed/simple; bh=jFCjxaDFyg3REYO0z0eTlaaGYHlxBa1hXMGTHWWTsBY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HNiiG7ANlEa23SP4sy5LlGnXYVPJcCro2qkElD720GU04lc/+tH0QLVCBL3URWB7g2knpc6NQSEefxOtsYG3DG9syTN5z2dYpAb0G/9d4o+VpMtCHK8mOx+v48ItYZNrkxKJjhp+/030FRxPOgiNXDpr0Z6rY0VllWRw2y7zhus= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=z86vJx9n; 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="z86vJx9n" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 979BDC4CEED; Tue, 2 Sep 2025 13:34:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756820098; bh=jFCjxaDFyg3REYO0z0eTlaaGYHlxBa1hXMGTHWWTsBY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z86vJx9n23PlohzNBPP3/rfsMeUx1b8lUi63k8XNoOUx8xdTOfx60SXsw7IBncvl7 nkyfzxdVJPS59bfpAml0Z7ktDXdyWUcGF8lS3c59bZp/FZzBCtoN4vTzREeFANLR3Y XYZX7XQ4BIadH0F11F9cuXBiXOPCKjg3mqQ21It8= 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 6.12 92/95] Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS" Date: Tue, 2 Sep 2025 15:21:08 +0200 Message-ID: <20250902131943.130857399@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250902131939.601201881@linuxfoundation.org> References: <20250902131939.601201881@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ 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; }