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 B01D02036E6; Thu, 10 Apr 2025 07:11:37 +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=1744269097; cv=none; b=JZCm+q4H+Nrkv5QSLAkoFnap6ZwMLRSLF/4bZ9nKHV22gNhIHY7Zn8llmvXuzawLwXS6HrWqdJKwqCJ3lzfWZGwhM0cjRKgPAuLEqR+bZpKQqgd92zrFgn1TI9MhOvK6c7PemB9WowCXTUA8084EK8ZX39q/M1CsrKuV/8oXNXY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744269097; c=relaxed/simple; bh=bPzeZgrP7PD3Md2w9w9dvWl898tFcB9NhFWNXwu0U2c=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=tFGiba6PWbRmyntCeQSs333BfDNE0Ij3KtTXv7wK5j811C68C4jTs0KXlDqNx45M14WsA8jW7rRlFZ6+hBxkK30ar38xKj5Epc2xHXjl1j80Zw+amo7+vLs8FaQ9M6SEJfbbRa5jwTUh5CrFQuBndoVvuTsQoyTgXapLPYR/R2Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=NUBxNMQE; 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="NUBxNMQE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C8EAAC4CEDD; Thu, 10 Apr 2025 07:11:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744269097; bh=bPzeZgrP7PD3Md2w9w9dvWl898tFcB9NhFWNXwu0U2c=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=NUBxNMQEaQS5a/bjuTtaryrBfraPSR8ULIOyeiTlDT6ymfmBkHo56NS+KeAD2k1fq bWbW/LhSa3QvBfS4dDQ4CN1yh8vvA89BIUoFYfKuNoxHJzU9UT2ZivgBiK21iJ0rBz xHnePbCD7Hf44XD717vA1ApB8xsiGaoFrGLSfBzw= Date: Thu, 10 Apr 2025 09:10:02 +0200 From: Greg KH To: Heikki Krogerus Cc: joswang , Benson Leung , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Jos Wang Subject: Re: [PATCH 1/1] usb: typec: displayport: Receive DP Status Update NAK request exit dp altmode Message-ID: <2025041054-landside-filtrate-17b0@gregkh> References: <20250209071926.69625-1-joswang1221@gmail.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Thu, Feb 13, 2025 at 03:52:04PM +0200, Heikki Krogerus wrote: > On Sun, Feb 09, 2025 at 03:19:26PM +0800, joswang wrote: > > From: Jos Wang > > > > Although some Type-C DRD devices that do not support the DP Sink > > function (such as Huawei Mate 40Pro), the Source Port initiates > > Enter Mode CMD, but the device responds to Enter Mode ACK, the > > Source port then initiates DP Status Update CMD, and the device > > responds to DP Status Update NAK. > > > > As PD2.0 spec ("6.4.4.3.4 Enter Mode Command")，A DR_Swap Message > > Shall Not be sent during Modal Operation between the Port Partners. > > At this time, the source port initiates DR_Swap message through the > > "echo device > /sys/class/typec/port0/data_role" command to switch > > the data role from host to device. The device will initiate a Hard > > Reset for recovery, resulting in the failure of data role swap. > > > > Therefore, when DP Status Update NAK is received, Exit Mode CMD is > > initiated to exit the currently entered DP altmode. > > > > Signed-off-by: Jos Wang > > This looks okay to me, but Benson, can you take a look at this? What ever happened to this patch?