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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,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 E0E8AC83000 for ; Tue, 28 Apr 2020 18:30:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B5F9321707 for ; Tue, 28 Apr 2020 18:30:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588098638; bh=ZdEoXfQqdR/KlSv3Rzr/9XNVcrwfzEXLQiDZD6AHx04=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jAHVLPr3UcP9Qy7Z+JHvL4kiAYgHCT4XSbJvjWJsNgS/7157eymMdLzjqvPpWGO0N AJU3eAuZL1OWRSuw+kXY6CaFqC5pdcXSMelxsd6M0mqPamqG/737ruF1ZYjMx3TjX0 2YI1oCx2lkYytedxmylABx2G1t0z4mPqeNvK+Nrs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729528AbgD1Sai (ORCPT ); Tue, 28 Apr 2020 14:30:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:45382 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729512AbgD1Sac (ORCPT ); Tue, 28 Apr 2020 14:30:32 -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 541E121744; Tue, 28 Apr 2020 18:30:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588098631; bh=ZdEoXfQqdR/KlSv3Rzr/9XNVcrwfzEXLQiDZD6AHx04=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A0FVS+p7isoWa+WhWdFox5mGhkbxAVFvZwvpPOJ4sATo+EZHgiUCvsSziGSPA27Nz GgFZf6hsNSB7E8WI8zt3mcKjzYjvxbUPeLDw1Rw3Hps+3NA0aFcJzc3kscY30NoA9u 209pmZWSbSCTxSXLhlGTsSjYIIXD1p5Vhm7U38Qw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kai-Heng Feng , Mathias Nyman , Sasha Levin Subject: [PATCH 4.19 031/131] xhci: Ensure link state is U3 after setting USB_SS_PORT_LS_U3 Date: Tue, 28 Apr 2020 20:24:03 +0200 Message-Id: <20200428182229.056078126@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200428182224.822179290@linuxfoundation.org> References: <20200428182224.822179290@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: 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 a024230f00e2d..eb4284696f25c 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -1266,7 +1266,16 @@ 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