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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 C9C92C38A2F for ; Sat, 18 Apr 2020 14:53:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9E26920753 for ; Sat, 18 Apr 2020 14:53:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587221605; bh=hVGd1XVXIQixtTCRrA9xVPLTqm8xr2yA0JSWE2QJe5Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=1FCkUdeEDkXM4An5jIAL91ZmRB8u997v4DAru6r9fHJ/N590LleMEBPUsblcqYQJ1 GqlxHhQLOXZtNb8OnUq5dqXreT8v9nrTR9flF+JrnxrOFLrUyCXafA7nC3UNa4HkLD uCY+g8zX8DgsIwaPYWw9lTa4IaqVGmbaFisWvS3M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728080AbgDROxK (ORCPT ); Sat, 18 Apr 2020 10:53:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:51814 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728232AbgDROmD (ORCPT ); Sat, 18 Apr 2020 10:42:03 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C124E221F4; Sat, 18 Apr 2020 14:42:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587220923; bh=hVGd1XVXIQixtTCRrA9xVPLTqm8xr2yA0JSWE2QJe5Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ka8qhuJRcsw5tRjNrkJfQvFfZsNRlz83wGzAbDa5PaUABf+eFo+MNFtjLF1+rqZhR c3vaRZGBCz/uctguncXZdpwVJmpS7wUMQN8P56QdAfJzIo40bCIWO2gCr2IAKsCmoG kUo0qnP0t683v28s6k94HXT5uozdRJY3GmsDjWbs= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kai-Heng Feng , Mathias Nyman , Greg Kroah-Hartman , Sasha Levin , linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 61/78] xhci: Ensure link state is U3 after setting USB_SS_PORT_LS_U3 Date: Sat, 18 Apr 2020 10:40:30 -0400 Message-Id: <20200418144047.9013-61-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200418144047.9013-1-sashal@kernel.org> References: <20200418144047.9013-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Kai-Heng Feng [ Upstream commit eb002726fac7cefb98ff39ddb89e150a1c24fe85 ] The xHCI spec doesn't specify the upper bound of U3 transition time. For some devices 20ms is not enough, so we need to make sure the link state is in U3 before further actions. I've tried to use U3 Entry Capability by setting U3 Entry Enable in config register, however the port change event for U3 transition interrupts the system suspend process. For now let's use the less ideal method by polling PLS. [use usleep_range(), and shorten the delay time while polling -Mathias] Signed-off-by: Kai-Heng Feng Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/20200312144517.1593-7-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/host/xhci-hub.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index af92b2576fe91..712cd44f05ace 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -1322,7 +1322,16 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, xhci_set_link_state(xhci, ports[wIndex], link_state); spin_unlock_irqrestore(&xhci->lock, flags); - msleep(20); /* wait device to enter */ + if (link_state == USB_SS_PORT_LS_U3) { + int retries = 16; + + while (retries--) { + usleep_range(4000, 8000); + temp = readl(ports[wIndex]->addr); + if ((temp & PORT_PLS_MASK) == XDEV_U3) + break; + } + } spin_lock_irqsave(&xhci->lock, flags); temp = readl(ports[wIndex]->addr); -- 2.20.1