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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 EC301C76186 for ; Wed, 24 Jul 2019 19:42:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BF28E229F4 for ; Wed, 24 Jul 2019 19:42:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563997342; bh=k7HusJDUgJunaBFNuyzKP/8EUR1t/9moYa77Naaiwrs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ijhp/oDYJGxP2azUh/EFWhE+MT5CpjuAXmQ5dcagwM1mPIXdFy0uQnaS2rd4Mm4EF /I4nQnCWa7JDf4So7OboWXy/fq+CBEaFeUFxhROohbCIFmXUSfHF99N7pMe1vRHLRL GE1c79hHvrhyUhgo39aSi9wVhwp4R3thkfPOGdRM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390350AbfGXTmV (ORCPT ); Wed, 24 Jul 2019 15:42:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:43960 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390344AbfGXTmT (ORCPT ); Wed, 24 Jul 2019 15:42:19 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BF14B217D4; Wed, 24 Jul 2019 19:42:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563997339; bh=k7HusJDUgJunaBFNuyzKP/8EUR1t/9moYa77Naaiwrs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LvEl3mxsIA2ow4EKXtSLXr2TKxX4HoqqSkjGF2qKQMzrXIAZoTfQAvn0yH7/13f3p J+LLeyMohRecP/flB3DqFqI2CAMt4pGHOVukuGm70doOkjrfIP8mIhEvHocj659Uvr hnoPiCkKm9uvZSgs/iKygyNUxvYYdDAFe1gbDlCI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Lee, Chiasheng" , Mathias Nyman , Lee@vger.kernel.org Subject: [PATCH 5.2 403/413] usb: Handle USB3 remote wakeup for LPM enabled devices correctly Date: Wed, 24 Jul 2019 21:21:34 +0200 Message-Id: <20190724191803.571898108@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190724191735.096702571@linuxfoundation.org> References: <20190724191735.096702571@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lee, Chiasheng commit e244c4699f859cf7149b0781b1894c7996a8a1df upstream. With Link Power Management (LPM) enabled USB3 links transition to low power U1/U2 link states from U0 state automatically. Current hub code detects USB3 remote wakeups by checking if the software state still shows suspended, but the link has transitioned from suspended U3 to enabled U0 state. As it takes some time before the hub thread reads the port link state after a USB3 wake notification, the link may have transitioned from U0 to U1/U2, and wake is not detected by hub code. Fix this by handling U1/U2 states in the same way as U0 in USB3 wakeup handling This patch should be added to stable kernels since 4.13 where LPM was kept enabled during suspend/resume Cc: # v4.13+ Signed-off-by: Lee, Chiasheng Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hub.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -3617,6 +3617,7 @@ static int hub_handle_remote_wakeup(stru struct usb_device *hdev; struct usb_device *udev; int connect_change = 0; + u16 link_state; int ret; hdev = hub->hdev; @@ -3626,9 +3627,11 @@ static int hub_handle_remote_wakeup(stru return 0; usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); } else { + link_state = portstatus & USB_PORT_STAT_LINK_STATE; if (!udev || udev->state != USB_STATE_SUSPENDED || - (portstatus & USB_PORT_STAT_LINK_STATE) != - USB_SS_PORT_LS_U0) + (link_state != USB_SS_PORT_LS_U0 && + link_state != USB_SS_PORT_LS_U1 && + link_state != USB_SS_PORT_LS_U2)) return 0; }