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 E24E71426E; Fri, 15 Mar 2024 08:01:32 +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=1710489693; cv=none; b=fQgRtM5UmxWovovs9zwsLVH1JDX5xeKDa0urhSg3uEX381BNeO1iSFMOA/8eszQEe8uPvJ9Y50gmYRwp2slmQRgQ9iV2efni+sGwtH3dBrtrT10sV6yNzVLDrMT7yuvChSVblqud4iEeE7leHE+NwkeqcezoyoI65Lfaw2PPhGQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710489693; c=relaxed/simple; bh=PbfTZHsdENp14D3ovvidJYfMH17kDutf9n4cQyx8ox0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=jrzZ5Hf3LScACMXBGaOUoKC/hbtLbGy39PCGlb71zZ+0xt+oWgBfd7SXG1X/1Lvn1wLvOeOmvNOUV8L3pG0EpVVQ0Tmx06QHq0nvF9XLU3Iwl/B7Lh+G3/I/YeluH13Ms1/TCyTziWIXSvpST0xMISh2d6JQ4JBsttxQ4uiGZbU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=G7coXQ5b; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="G7coXQ5b" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68149C433F1; Fri, 15 Mar 2024 08:01:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1710489692; bh=PbfTZHsdENp14D3ovvidJYfMH17kDutf9n4cQyx8ox0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=G7coXQ5b54VgdvnYDcpTmho63RMgSvh+gH59wZrrzZ9+h4CZl36BS63F8qZc/s/lg NAhNDnIKCI8xPyXd6Xo6zku/rT8xaQSC911N22l78wLy5ErP1kFSq4kmujJzRwSguJ RMaV7PCBdqwsfD7C84m08pZD2kZfMCfMnzWkhBbDqRuK+Qv4TAlP7VsMXCZ+SWEFn8 KiJ/c19OkKwNvBB9gmNh+J+jikwPr8RtfWgT5vscVNmpfcMhBJxlZj9qwy1EzfBPEL mMqm/wb28HHMKR1zl9PDjy4rRRrVpTvGKUWKbFRaVQKCc70d9tPJhQ0yxRqrMmba3N 5LTPjSjVqQzWA== Received: from johan by xi.lan with local (Exim 4.97.1) (envelope-from ) id 1rl2VZ-000000006XA-0BOB; Fri, 15 Mar 2024 09:01:41 +0100 Date: Fri, 15 Mar 2024 09:01:41 +0100 From: Johan Hovold To: Cameron Williams Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: CH341 RTS/CTS flow control disabled in driver? Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Mar 14, 2024 at 10:13:03PM +0000, Cameron Williams wrote: > I am wondering if anyone knows anything regarding the RTS/CTS lines on > the CH341 (maybe CH340 though I have no chip example). > From my tests, neither of them seem to have RTS/CTS respected, and I > don't believe they are fake? > Is this intended behaviour? Looking through the source I can see > RTS/DTR should be supported, but it just doesn't seem to work. The driver does not implement hardware flow control (CRTSCTS) so this is expected behaviour. Johan