From patchwork Sat Apr 10 00:47:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thinh Nguyen X-Patchwork-Id: 12195261 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 EF2F9C433B4 for ; Sat, 10 Apr 2021 00:47:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B2DBD6115A for ; Sat, 10 Apr 2021 00:47:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235323AbhDJArf (ORCPT ); Fri, 9 Apr 2021 20:47:35 -0400 Received: from smtprelay-out1.synopsys.com ([149.117.73.133]:39340 "EHLO smtprelay-out1.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235312AbhDJArf (ORCPT ); Fri, 9 Apr 2021 20:47:35 -0400 Received: from mailhost.synopsys.com (sv1-mailhost2.synopsys.com [10.205.2.132]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id C813940344; Sat, 10 Apr 2021 00:47:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1618015641; bh=Ity4RAQpCC9LKIRutd5Q6SyJNY07n8Go4Fm1XgNf0jo=; h=Date:In-Reply-To:References:From:Subject:To:Cc:From; b=iJpYeiBjg6WXOFW6p131CN0KXAqJSC7Z+PpDwqjz5R8XxVzX9wZ2tOVDITz01SPkG qMTYal+m05+AktQPM4FbjQLtlOongW/Bwbawgr42IEuSnrN+kavApaBvSf+zSOmpKG oSQvHVjdxUWYc9C/MCHw6bzAmQW7/7AE/p0FAWy72wdSb810kf33NMnCBMqFp1rNJj HXwYH46S6aERVx6mumVoAqxAL7KNeZEIqiSdzvKdBB2OqBMoRlRP5tvQUcKjCJGQ90 WNjTbpi8xhQ2Uuri99xl8dJwmF2+xdOTdGPHd5AOYI356nuTjgcWY7xoJ7XDct9LBe v29pntzG9KFvg== Received: from lab-vbox (unknown [10.205.130.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mailhost.synopsys.com (Postfix) with ESMTPSA id 7F81AA007C; Sat, 10 Apr 2021 00:47:20 +0000 (UTC) Received: by lab-vbox (sSMTP sendmail emulation); Fri, 09 Apr 2021 17:47:20 -0700 Date: Fri, 09 Apr 2021 17:47:20 -0700 Message-Id: In-Reply-To: References: X-SNPS-Relay: synopsys.com From: Thinh Nguyen Subject: [PATCH v2 6/7] usb: xhci: Workaround lost disconnect port status To: Felipe Balbi , Greg Kroah-Hartman , Thinh.Nguyen@synopsys.com, linux-usb@vger.kernel.org, Mathias Nyman Cc: John Youn Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org If an eSS device with active periodic transfers is disconnected from the DWC_usb31 (v1.90a and prior) host controller at root port, the host controller may not detect a disconnection. By active transfers, it means that the endpoint is not in flow control, and there are active Transfer Descriptors available for the host to initiate transfers to the endpoint. This issue can occur if the endpoint periodic interval is in 2ms, 4ms, or 8ms. In addition, the host controller will not be able to detect a new device connection while the disconnection is not processed. The controller will set the link state of the affected port to eSS_INACTIVE. To workaround this, have the xHCI driver polls for the eSS root port status every 2 seconds. If eSS_INACTIVE state is detected, initiate a fake connection change to stop all the active endpoints and start polling for new connection change. Since XHCI_COMP_MODE_QUIRK is basically doing the same thing except for polling for a different link state, we will use the same timer and polling rate for this new workaround. Introduce a new quirk XHCI_LOST_DISCONNECT_QUIRK to poll for eSS_INACTIVE port link state and fake a connection change. Signed-off-by: Thinh Nguyen --- Changes in v2: - None drivers/usb/host/xhci-hub.c | 10 +++++++- drivers/usb/host/xhci.c | 44 ++++++++++++++++++++++++--------- include/linux/usb/xhci-quirks.h | 1 + 3 files changed, 42 insertions(+), 13 deletions(-) diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index 8bfafbd680ab..32fbf95f021b 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -868,6 +868,11 @@ static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci, if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && (pls == USB_SS_PORT_LS_COMP_MOD)) pls |= USB_PORT_STAT_CONNECTION; + + /* Fake a connection change */ + if ((xhci->quirks & XHCI_LOST_DISCONNECT_QUIRK) && + pls == XDEV_INACTIVE) + pls |= USB_PORT_STAT_CONNECTION; } /* update status field */ @@ -887,7 +892,8 @@ static void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status, u32 all_ports_seen_u0 = ((1 << xhci->usb3_rhub.num_ports) - 1); bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0); - if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK)) + if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK) || + (xhci->quirks & XHCI_LOST_DISCONNECT_QUIRK)) return; if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) { @@ -1654,6 +1660,8 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf) trace_xhci_hub_status_data(i, temp); if ((temp & mask) != 0 || + ((xhci->quirks & XHCI_LOST_DISCONNECT_QUIRK) && + (temp & PORT_PLS_MASK) == XDEV_INACTIVE) || (bus_state->port_c_suspend & 1 << i) || (bus_state->resume_done[i] && time_after_eq( jiffies, bus_state->resume_done[i]))) { diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index e1b3d1063f6b..62275ee88849 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -485,10 +485,14 @@ static void port_check(struct timer_list *t) xhci = from_timer(xhci, t, port_check_timer); rhub = &xhci->usb3_rhub; + hcd = xhci->shared_hcd; for (i = 0; i < rhub->num_ports; i++) { + bool poll_rhub = false; + temp = readl(rhub->ports[i]->addr); - if ((temp & PORT_PLS_MASK) == USB_SS_PORT_LS_COMP_MOD) { + if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && + ((temp & PORT_PLS_MASK) == USB_SS_PORT_LS_COMP_MOD)) { /* * Compliance Mode Detected. Letting USB Core * handle the Warm Reset @@ -498,8 +502,15 @@ static void port_check(struct timer_list *t) i + 1); xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, "Attempting compliance mode recovery"); - hcd = xhci->shared_hcd; + poll_rhub = true; + } + + if ((xhci->quirks & XHCI_LOST_DISCONNECT_QUIRK) && + ((temp & PORT_PLS_MASK) == XDEV_INACTIVE)) + poll_rhub = true; + + if (poll_rhub) { if (hcd->state == HC_STATE_SUSPENDED) usb_hcd_resume_root_hub(hcd); @@ -507,7 +518,9 @@ static void port_check(struct timer_list *t) } } - if (xhci->port_status_u0 != ((1 << rhub->num_ports) - 1)) + if ((xhci->quirks & XHCI_LOST_DISCONNECT_QUIRK) || + ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && + xhci->port_status_u0 != ((1 << rhub->num_ports) - 1))) mod_timer(&xhci->port_check_timer, jiffies + msecs_to_jiffies(PORT_CHECK_MSECS)); } @@ -593,10 +606,12 @@ static int xhci_init(struct usb_hcd *hcd) xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Finished xhci_init"); /* Initializing Compliance Mode Recovery Data If Needed */ - if (xhci_compliance_mode_recovery_timer_quirk_check()) { + if (xhci_compliance_mode_recovery_timer_quirk_check()) xhci->quirks |= XHCI_COMP_MODE_QUIRK; + + if (xhci->quirks & XHCI_LOST_DISCONNECT_QUIRK || + xhci->quirks & XHCI_COMP_MODE_QUIRK) port_check_timer_init(xhci); - } return retval; } @@ -736,8 +751,9 @@ static void xhci_stop(struct usb_hcd *hcd) xhci_cleanup_msix(xhci); /* Deleting Compliance Mode Recovery Timer */ - if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && - (!(xhci_all_ports_seen_u0(xhci)))) { + if ((xhci->quirks & XHCI_LOST_DISCONNECT_QUIRK) || + ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && + !(xhci_all_ports_seen_u0(xhci)))) { del_timer_sync(&xhci->port_check_timer); xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, "%s: port check timer deleted", __func__); @@ -1058,8 +1074,9 @@ int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup) * Deleting Port Check Timer because the xHCI Host * is about to be suspended. */ - if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && - (!(xhci_all_ports_seen_u0(xhci)))) { + if ((xhci->quirks & XHCI_LOST_DISCONNECT_QUIRK) || + ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && + !(xhci_all_ports_seen_u0(xhci)))) { del_timer_sync(&xhci->port_check_timer); xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, "%s: port check timer deleted", __func__); @@ -1145,8 +1162,9 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) /* If restore operation fails, re-initialize the HC during resume */ if ((temp & STS_SRE) || hibernated) { - if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && - !(xhci_all_ports_seen_u0(xhci))) { + if ((xhci->quirks & XHCI_LOST_DISCONNECT_QUIRK) || + ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && + !(xhci_all_ports_seen_u0(xhci)))) { del_timer_sync(&xhci->port_check_timer); xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, "Port Check Timer deleted!"); @@ -1247,7 +1265,9 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) * to suffer the Compliance Mode issue again. It doesn't matter if * ports have entered previously to U0 before system's suspension. */ - if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && !comp_timer_running) + if (!comp_timer_running && + ((xhci->quirks & XHCI_LOST_DISCONNECT_QUIRK) || + (xhci->quirks & XHCI_COMP_MODE_QUIRK))) port_check_timer_init(xhci); if (xhci->quirks & XHCI_ASMEDIA_MODIFY_FLOWCONTROL) diff --git a/include/linux/usb/xhci-quirks.h b/include/linux/usb/xhci-quirks.h index 5bedf5a25f7a..df92e78b8083 100644 --- a/include/linux/usb/xhci-quirks.h +++ b/include/linux/usb/xhci-quirks.h @@ -60,5 +60,6 @@ #define XHCI_NO_SOFT_RETRY BIT_ULL(40) #define XHCI_ISOC_BLOCKED_DISCONNECT BIT_ULL(41) #define XHCI_LIMIT_FS_BI_INTR_EP BIT_ULL(42) +#define XHCI_LOST_DISCONNECT_QUIRK BIT_ULL(43) #endif /* __LINUX_USB_XHCI_QUIRKS_H */