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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 85F0AC433E0 for ; Tue, 26 May 2020 07:04:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5DA8320870 for ; Tue, 26 May 2020 07:04:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731580AbgEZHEV (ORCPT ); Tue, 26 May 2020 03:04:21 -0400 Received: from comms.puri.sm ([159.203.221.185]:55422 "EHLO comms.puri.sm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731372AbgEZHEU (ORCPT ); Tue, 26 May 2020 03:04:20 -0400 Received: from localhost (localhost [127.0.0.1]) by comms.puri.sm (Postfix) with ESMTP id 66ECFDF80A; Tue, 26 May 2020 00:04:19 -0700 (PDT) Received: from comms.puri.sm ([127.0.0.1]) by localhost (comms.puri.sm [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id otJgZgiSin7j; Tue, 26 May 2020 00:04:17 -0700 (PDT) To: "mathias.nyman@intel.com" , "gregkh@linuxfoundation.org" , Felipe Balbi , "p.zabel@pengutronix.de" , nicolas.ferre@microchip.com, ludovic.desroches@microchip.com, cristian.birsan@microchip.com, iain.galloway@nxp.com Cc: "linux-usb@vger.kernel.org" , "kernel@puri.sm" , "linux-arm-kernel@lists.infradead.org" From: Martin Kepplinger Autocrypt: addr=martin.kepplinger@puri.sm; keydata= mQINBFULfZABEADRxJqDOYAHfrp1w8Egcv88qoru37k1x0Ugy8S6qYtKLAAt7boZW+q5gPv3 Sj2KjfkWA7gotXpASN21OIfE/puKGwhDLAySY1DGNMQ0gIVakUO0ji5GJPjeB9JlmN5hbA87 Si9k3yKQQfv7Cf9Lr1iZaV4A4yjLP/JQMImaCVdC5KyqJ98Luwci1GbsLIGX3EEjfg1+MceO 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FmxNAJx7iiXaUY9KQ3snoEz3r37RxEDcvTY9KKahwxEzk2Mf58OPVaV4PEsRianrmErSUfmp l93agbtZK1r5LaxeItFOj+O2hWFLNDenJRlBYwXwlJCiHxM/O273hZZPoP8L5p54uXhaS5EJ uV2Xzgbi3VEbw3GZr+EnDC7XNE2wUrnlD/w2W6RzVYjVT6IX4SamNlV+MWX0/1fYCutfqZl8 6BSKmJjlWpfkPKzyzjhGQVZrTZYnKAu471hRv8/6Dx5JuZJgDCnYanNx3DDreRMu/nq6TfaO ekMtxgNYb/8oDry09UFHbGHLsWn6oBo= Subject: Microchip USB2642 Hub not resuming from USB autosuspend Message-ID: <8738e4d3-62b1-0144-107d-ff42000ed6c6@puri.sm> Date: Tue, 26 May 2020 09:04:12 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org hi all, our Librem 5 includes the microchip USB2642 hub with integrated/connected SD cardcreader (and we connect the baseband modem to it): https://www.microchip.com/wwwproducts/en/USB2642 When we remove the (integrated) SD cardreader entirely (in sysfs), the Hub suspends as long as the modem doesn't need a connection. But then the modem fails to *resume* the Hub. Linux xhci host times out and dies during resuming, which leaves a system without the Hub entirely. You can see some logs and tests here https://source.puri.sm/Librem5/linux-next/issues/170#note_89808 (when scrolling down). Microchip says the their product has the following bug which results in our problem: https://microchipsupport.force.com/s/article/Device-attached-to-Hub-Downstream-Facing-Port-does-not-Resume-from-Suspend (that may or may not be the real and only reason for our problem) That issue suggests working around it in the HC by somehow sending "HS SOF as soon as possible after the HS RESUME EOP". We use imx8mq and the dwc3 driver for the designware USB hardware that NXP documents in chapter 11.1.3 of the reference manual: https://www.nxp.com/products/processors-and-microcontrollers/arm-processors/i-mx-applications-processors/i-mx-8-processors/i-mx-8m-family-armcortex-a53-cortex-m4-audio-voice-video:i.MX8M?tab=Documentation_Tab What can we try to change in dwc3 or xhci drivers in order to achieve sending SOF earlier after resume? What else that I don't currently think of could lead to the USB suspend/resume problem here? I'm happy for any hint, question or thought about this and hope that this is useful for others too. thanks, martin p.s.: A follow-up for Microchip: The Hub doesn't suspend when the SD cardreader is connected *without* and SD card inserted (as described above, we remove the cardreader for testing here). What could cause this?