From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5809EC433E6 for ; Tue, 23 Feb 2021 19:16:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 300C564EC9 for ; Tue, 23 Feb 2021 19:16:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233627AbhBWTP4 (ORCPT ); Tue, 23 Feb 2021 14:15:56 -0500 Received: from bee.birch.relay.mailchannels.net ([23.83.209.14]:54334 "EHLO bee.birch.relay.mailchannels.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233602AbhBWTPz (ORCPT ); Tue, 23 Feb 2021 14:15:55 -0500 X-Sender-Id: dreamhost|x-authsender|smtp@contentfirst.com Received: from relay.mailchannels.net (localhost [127.0.0.1]) by relay.mailchannels.net (Postfix) with ESMTP id DAE4722569; Tue, 23 Feb 2021 19:15:12 +0000 (UTC) Received: from pdx1-sub0-mail-a45.g.dreamhost.com (100-96-133-21.trex.outbound.svc.cluster.local [100.96.133.21]) (Authenticated sender: dreamhost) by relay.mailchannels.net (Postfix) with ESMTPA id 4F0BE205ED; Tue, 23 Feb 2021 19:15:12 +0000 (UTC) X-Sender-Id: dreamhost|x-authsender|smtp@contentfirst.com Received: from pdx1-sub0-mail-a45.g.dreamhost.com (pop.dreamhost.com [64.90.62.162]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384) by 100.96.133.21 (trex/6.0.2); Tue, 23 Feb 2021 19:15:12 +0000 X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|smtp@contentfirst.com X-MailChannels-Auth-Id: dreamhost X-Stop-Eight: 3256f254205c773f_1614107712625_1346096189 X-MC-Loop-Signature: 1614107712622:1926028336 X-MC-Ingress-Time: 1614107712622 Received: from pdx1-sub0-mail-a45.g.dreamhost.com (localhost [127.0.0.1]) by pdx1-sub0-mail-a45.g.dreamhost.com (Postfix) with ESMTP id B35B37F04B; Tue, 23 Feb 2021 11:15:11 -0800 (PST) Received: from industrynumbers.com (pool-100-15-209-187.washdc.fios.verizon.net [100.15.209.187]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: smtp@contentfirst.com) by pdx1-sub0-mail-a45.g.dreamhost.com (Postfix) with ESMTPSA id 103907F03D; Tue, 23 Feb 2021 11:15:08 -0800 (PST) Received: from industrynumbers.com (localhost [127.0.0.1]) by industrynumbers.com (Postfix) with ESMTP id BE266282D7A; Tue, 23 Feb 2021 14:15:06 -0500 (EST) Subject: Re: non-standard baud rates with Prolific 2303 USB-serial To: Johan Hovold Cc: charles-yeh@prolific.com.tw, linux-serial@vger.kernel.org, linux-usb@vger.kernel.org, Charles Yeh , Joe Abbott References: <0f9caf26-af58-13a9-9947-47bb646f505e@IEEE.org> <780b9aa6-890d-47fd-d6b2-cd9a39f7634a@IEEE.org> <93584ae4-665e-1e67-01e0-cc53f987bee4@IEEE.org> X-DH-BACKEND: pdx1-sub0-mail-a45 From: "Michael G. Katzmann" Message-ID: <4edfb35f-ed81-bade-daee-38a1d7a60a7d@IEEE.org> Date: Tue, 23 Feb 2021 14:15:06 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On 2/23/21 11:52 AM, Johan Hovold wrote: > On Tue, Feb 23, 2021 at 11:30:41AM -0500, Michael G. Katzmann wrote: >> On 2/23/21 11:14 AM, Johan Hovold wrote: >>> I only have an HXD (and a GC) here. >>> >>> The HXD has bcdUSB as 1.10 unlike your TA with 2.00, but not sure that >>> helps. >> Sound promising .. why do you think this is this not reliable? > Perhaps it is. Perhaps even bcdDevice of 3.00 is enough (includes some > older variants that the TA replaced supposedly). Not sure anyone ever > tried the current scheme on those older models. > > Charles, could you post the output of "lsusb -v" for your PL2303TA? And > did you verify that you actually got 110 Bd with the current Linux > driver? > > Johan Here is the USB packet capture from Wireshark oon Windows 10 when: 1) plugging in pl2303 (packets 18-393) 2) setting the device wia cmd line to 110/even/7 bits/2 stop (packets 393-690) (device is on port 1.7) https://drive.google.com/file/d/17TkV9JB2iFNdr4LvRftBnV3_DgITGvUH/view?usp=sharing There are orders of magnitude more traffic than in Linux! -- |\ _,,,---,,_ Michael Katzmann /,`.-'`' -. ;-;;,_ NV3Z / VK2BEA / G4NYV |,4- ) )-,_. ,\ ( `'-' '---''(_/--' `-'\_) MichaelK@IEEE.org