From patchwork Wed Aug 25 10:51:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kishon Vijay Abraham I X-Patchwork-Id: 502674 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=-14.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT 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 01E35C4338F for ; Wed, 25 Aug 2021 10:51:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D798B610E5 for ; Wed, 25 Aug 2021 10:51:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238500AbhHYKw3 (ORCPT ); Wed, 25 Aug 2021 06:52:29 -0400 Received: from fllv0016.ext.ti.com ([198.47.19.142]:45278 "EHLO fllv0016.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231697AbhHYKw2 (ORCPT ); Wed, 25 Aug 2021 06:52:28 -0400 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id 17PApb3L003133; Wed, 25 Aug 2021 05:51:37 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1629888697; bh=ohwW3unW5jCvC6uKqinVsEJ5ctT/OYLeiTK7Sp7kdy0=; h=From:To:CC:Subject:Date; b=GWmhQqVYMOAU6Iml4yM86rwfdtPVaStREPzPK7Ez7DANMvk8ydXW3ZcEqEc8RmzPx 5/NfRVTHKGMGk1NjrTilX4HUFJDYql2zL3ooiNWUh0CRvD95yYmh9HmEEXUrms8hQI fxwk9xDfwT3G5o/1aC4luFh4YG52b9x82lhjoRTo= Received: from DFLE103.ent.ti.com (dfle103.ent.ti.com [10.64.6.24]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 17PApbpC070866 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 25 Aug 2021 05:51:37 -0500 Received: from DFLE107.ent.ti.com (10.64.6.28) by DFLE103.ent.ti.com (10.64.6.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Wed, 25 Aug 2021 05:51:36 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE107.ent.ti.com (10.64.6.28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2 via Frontend Transport; Wed, 25 Aug 2021 05:51:36 -0500 Received: from a0393678-lt.ent.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 17PApW85129194; Wed, 25 Aug 2021 05:51:33 -0500 From: Kishon Vijay Abraham I To: Greg Kroah-Hartman , Mathias Nyman , Alan Stern CC: , , , Kishon Vijay Abraham I , Subject: [PATCH 0/3] Fix cold plugged USB device on certain PCIe USB cards Date: Wed, 25 Aug 2021 16:21:29 +0530 Message-ID: <20210825105132.10420-1-kishon@ti.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Cold plugged USB device was not detected on certain PCIe USB cards (like Inateck card connected to AM64 EVM or connected to J7200 EVM). Re-plugging the USB device always gets it enumerated. This issue was discussed in https://lore.kernel.org/r/772e4001-178e-4918-032c-6e625bdded24@ti.com and https://bugzilla.kernel.org/show_bug.cgi?id=214021 So the suggested solution is to register both root hubs along with the second hcd for xhci. RFC Patch series can be found at [1] Changes from RFC: 1) Mathias identified potential issues with the RFC patch [2] and suggested the solution to use HCD flags. This series implements it. [1] -> https://lore.kernel.org/linux-usb/20210824105302.25382-1-kishon@ti.com/ [2] -> https://lore.kernel.org/linux-usb/06693934-28f2-d59e-b004-62cabd3f9e8e@linux.intel.com Kishon Vijay Abraham I (3): usb: core: hcd: Modularize HCD stop configuration in usb_stop_hcd() usb: core: hcd: Add support for deferring roothub registration xhci: Set HCD flag to defer primary roothub registration drivers/usb/core/hcd.c | 67 +++++++++++++++++++++++++++-------------- drivers/usb/host/xhci.c | 2 +- include/linux/usb/hcd.h | 2 ++ 3 files changed, 48 insertions(+), 23 deletions(-) Acked-by: Alan Stern