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 524E4C38A29 for ; Sat, 18 Apr 2020 14:43:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2389222251 for ; Sat, 18 Apr 2020 14:43:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587221007; bh=ZdEoXfQqdR/KlSv3Rzr/9XNVcrwfzEXLQiDZD6AHx04=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hcie/qf4gP11aHK4BuGoA75WMvx4GqgPHrpDNDGjSz3jAouOYJl5CynttU878tqKm btYdQkw5TqEzCjeAApnAuVNS8d1rHyCO7O0dNNCmgD6+n7s8UaMG4Fkz3tw6/6x3Sb e431ZigdddK4HO8HSE5d5+ksIDH0xCb/ohkpuYE8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728579AbgDROn0 (ORCPT ); Sat, 18 Apr 2020 10:43:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:54204 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728531AbgDROnR (ORCPT ); Sat, 18 Apr 2020 10:43:17 -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 EF3012224F; Sat, 18 Apr 2020 14:43:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587220996; bh=ZdEoXfQqdR/KlSv3Rzr/9XNVcrwfzEXLQiDZD6AHx04=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oH/81PI29x1NiOyxrF56O9/5+Xy2WTjoy5d+EzK4QIxZoiGRPW+3if+bzLfsFq+bi PiVagJniOPo8dCmx83eq1JOQphCOISqrrXmZAwcXbPsCGC8OpjXX+dAgdZydsWZMsa JQKXTAnn72gvbzZxAuE0EAvHvRwrUh3O6nTvdqoM= 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 4.19 39/47] xhci: Ensure link state is U3 after setting USB_SS_PORT_LS_U3 Date: Sat, 18 Apr 2020 10:42:19 -0400 Message-Id: <20200418144227.9802-39-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200418144227.9802-1-sashal@kernel.org> References: <20200418144227.9802-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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