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=-0.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 EB6C0C004C9 for ; Tue, 7 May 2019 09:37:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 833E7204FD for ; Tue, 7 May 2019 09:37:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726792AbfEGJhP (ORCPT ); Tue, 7 May 2019 05:37:15 -0400 Received: from mail1.bemta26.messagelabs.com ([85.158.142.3]:59407 "EHLO mail1.bemta26.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726286AbfEGJhO (ORCPT ); Tue, 7 May 2019 05:37:14 -0400 Received: from [85.158.142.103] (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256 bits)) by server-3.bemta.az-a.eu-central-1.aws.symcld.net id 68/81-19557-7C151DC5; Tue, 07 May 2019 09:37:11 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrEIsWRWlGSWpSXmKPExsUyo1hfUvd44MU Ygw33NSw6D5xhtzjW9oTdonnxejaLy7vmsFksWtbK7MDqsWlVJ5vH/rlr2D0+b5Lz2Pv5N0sA SxRrZl5SfkUCa8aBFT8ZCz6wVdy5e5ipgfEZaxcjF4eQwBpGid+/frB3MXJy8AqYSMx+8okFx BYWsJPoXraCrYuRg4NNQFei644pSFhEQF5i1tuLjCA2s8AGRolFG8tAbBYBFYmnuyaDxTkFnC Q61k9lBWkVEnCUOHdFA6JcU6J1+2+wTRICGhIbbh5jgtgqKHFy5hMWiBp5ieats5khWmUljl6 KhShXkDi7ZSIjhJ0kca7vCtsERoFZSKbOQjJpFpJJCxiZVzFaJhVlpmeU5CZm5ugaGhjoGhoa 6xrpGpqb6SVW6SbqpZbqJqfmlRQlAmX1EsuL9Yorc5NzUvTyUks2MQLDP6WQacMOxmcL0w8xS nIwKYnyithfjBHiS8pPqcxILM6ILyrNSS0+xCjDwaEkwbszACgnWJSanlqRlpkDjESYtAQHj5 II73KQNG9xQWJucWY6ROoUoy5H38Znc5mFWPLy81KlxHnFQIoEQIoySvPgRsCSwiVGWSlhXkY GBgYhnoLUotzMElT5V4ziHIxKwrxnQKbwZOaVwG16BXQEE9AR8zrOgRxRkoiQkmpgtPd9o2us OXlX4lOnownJZv9rnhScLjlaZpM9odbz2ru4Y/KedkI/FvZcfe/71PV4a9Xx7R0X7nx/+WE9m 9BiPa41/Lobk6fnFr06strAJ0g4nl037Py78OnPf7kr6rIpNd+PYfYJ2npavFQtk2OGxJS6zU tnmTE7CyrtbBF58dLEIedWUZm9EktxRqKhFnNRcSIA5H11sAUDAAA= X-Env-Sender: cst@phaseone.com X-Msg-Ref: server-24.tower-228.messagelabs.com!1557221831!6022338!1 X-Originating-IP: [152.115.47.25] X-SYMC-ESS-Client-Auth: outbound-route-from=pass X-StarScan-Received: X-StarScan-Version: 9.31.5; banners=-,-,- X-VirusChecked: Checked Received: (qmail 23581 invoked from network); 7 May 2019 09:37:11 -0000 Received: from unknown (HELO Exchange2.phaseone.com) (152.115.47.25) by server-24.tower-228.messagelabs.com with AES256-SHA encrypted SMTP; 7 May 2019 09:37:11 -0000 Received: from cstu16.phaseone.com (172.16.2.207) by Exchange2.phaseone.com (172.16.1.180) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Tue, 7 May 2019 11:37:10 +0200 Message-ID: <1557221830.114189.8.camel@phaseone.com> Subject: Re: [PATCH] usb: gadget: configfs: Add lpm_Ux_disable From: "Claus H. Stovgaard" To: CC: Felipe Balbi , Greg Kroah-Hartman , , "Anurag Kumar Vulisha" Date: Tue, 7 May 2019 11:37:10 +0200 In-Reply-To: <1557220655-123090-1-git-send-email-cst@phaseone.com> References: <1557220655-123090-1-git-send-email-cst@phaseone.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Originating-IP: [172.16.2.207] X-ClientProxiedBy: Exchange3.phaseone.com (172.16.1.184) To Exchange2.phaseone.com (172.16.1.180) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2019-05-07 at 11:09 +0200, Claus H. Stovgaard wrote: > When combining dwc3 with an redriver for a USB Type-C device > solution, it > sometimes have problems with leaving U1/U2 for certain hosts, > resulting in > link training errors and reconnects. This create an interface via > configfs for disabling U1/U2, enabling a workaround for devices based > on > dwc3. > Sorry messed up a bit with a missing cover letter. This feature relates to Anurag patch [1] and a thread [2] from earlier  Where Anurags patch focus on setting U1/U2 latency in the BOS descriptor from the devicetree, this patch focuses on having a configfs interface for forcing the UDC (here the dwc3) to not enable U1/U2 and reject the SET_SEL(U1/U2). Looking forward to input. [1] https://www.spinics.net/lists/linux-usb/msg179732.html [2] https://www.spinics.net/lists/linux-usb/msg179393.html