From patchwork Thu Mar 11 11:53:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathias Nyman X-Patchwork-Id: 12131057 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 A47EFC4332B for ; Thu, 11 Mar 2021 11:53:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6F47764FD0 for ; Thu, 11 Mar 2021 11:53:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232766AbhCKLwl (ORCPT ); Thu, 11 Mar 2021 06:52:41 -0500 Received: from mga07.intel.com ([134.134.136.100]:40662 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232785AbhCKLwe (ORCPT ); Thu, 11 Mar 2021 06:52:34 -0500 IronPort-SDR: IwRHDjTs/w55ttQAst6aLD+RmjbRHcQoY8a3oWdToCGE3kwCMYDYuWfBDgFp/drA5gNc/pJVFG kvdpTlxPOjKg== X-IronPort-AV: E=McAfee;i="6000,8403,9919"; a="252671308" X-IronPort-AV: E=Sophos;i="5.81,240,1610438400"; d="scan'208";a="252671308" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Mar 2021 03:52:33 -0800 IronPort-SDR: j8l4qiryyenj/QQUQoLd+AXl6f4PVdT1Fvf8Pu1AQo8ZZhoMy79Hkf50YE4aoaCnLypaJ1NTzt bFl+Q0cUvVUg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,240,1610438400"; d="scan'208";a="409463991" Received: from mattu-haswell.fi.intel.com ([10.237.72.170]) by orsmga007.jf.intel.com with ESMTP; 11 Mar 2021 03:52:32 -0800 From: Mathias Nyman To: Cc: , Mathias Nyman , stable@vger.kernel.org, Mika Westerberg Subject: [PATCH 4/4] xhci: Fix repeated xhci wake after suspend due to uncleared internal wake state Date: Thu, 11 Mar 2021 13:53:53 +0200 Message-Id: <20210311115353.2137560-5-mathias.nyman@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210311115353.2137560-1-mathias.nyman@linux.intel.com> References: <20210311115353.2137560-1-mathias.nyman@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org If port terminations are detected in suspend, but link never reaches U0 then xHCI may have an internal uncleared wake state that will cause an immediate wake after suspend. This wake state is normally cleared when driver clears the PORT_CSC bit, which is set after a device is enabled and in U0. Write 1 to clear PORT_CSC for ports that don't have anything connected when suspending. This makes sure any pending internal wake states in xHCI are cleared. Cc: stable@vger.kernel.org Tested-by: Mika Westerberg Signed-off-by: Mathias Nyman --- drivers/usb/host/xhci.c | 62 ++++++++++++++++++++--------------------- 1 file changed, 30 insertions(+), 32 deletions(-) diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 48a68fcf2b36..1975016f46bf 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -883,44 +883,42 @@ static void xhci_clear_command_ring(struct xhci_hcd *xhci) xhci_set_cmd_ring_deq(xhci); } -static void xhci_disable_port_wake_on_bits(struct xhci_hcd *xhci) +/* + * Disable port wake bits if do_wakeup is not set. + * + * Also clear a possible internal port wake state left hanging for ports that + * detected termination but never successfully enumerated (trained to 0U). + * Internal wake causes immediate xHCI wake after suspend. PORT_CSC write done + * at enumeration clears this wake, force one here as well for unconnected ports + */ + +static void xhci_disable_hub_port_wake(struct xhci_hcd *xhci, + struct xhci_hub *rhub, + bool do_wakeup) { - struct xhci_port **ports; - int port_index; unsigned long flags; u32 t1, t2, portsc; + int i; spin_lock_irqsave(&xhci->lock, flags); - /* disable usb3 ports Wake bits */ - port_index = xhci->usb3_rhub.num_ports; - ports = xhci->usb3_rhub.ports; - while (port_index--) { - t1 = readl(ports[port_index]->addr); - portsc = t1; - t1 = xhci_port_state_to_neutral(t1); - t2 = t1 & ~PORT_WAKE_BITS; - if (t1 != t2) { - writel(t2, ports[port_index]->addr); - xhci_dbg(xhci, "disable wake bits port %d-%d, portsc: 0x%x, write: 0x%x\n", - xhci->usb3_rhub.hcd->self.busnum, - port_index + 1, portsc, t2); - } - } + for (i = 0; i < rhub->num_ports; i++) { + portsc = readl(rhub->ports[i]->addr); + t1 = xhci_port_state_to_neutral(portsc); + t2 = t1; + + /* clear wake bits if do_wake is not set */ + if (!do_wakeup) + t2 &= ~PORT_WAKE_BITS; + + /* Don't touch csc bit if connected or connect change is set */ + if (!(portsc & (PORT_CSC | PORT_CONNECT))) + t2 |= PORT_CSC; - /* disable usb2 ports Wake bits */ - port_index = xhci->usb2_rhub.num_ports; - ports = xhci->usb2_rhub.ports; - while (port_index--) { - t1 = readl(ports[port_index]->addr); - portsc = t1; - t1 = xhci_port_state_to_neutral(t1); - t2 = t1 & ~PORT_WAKE_BITS; if (t1 != t2) { - writel(t2, ports[port_index]->addr); - xhci_dbg(xhci, "disable wake bits port %d-%d, portsc: 0x%x, write: 0x%x\n", - xhci->usb2_rhub.hcd->self.busnum, - port_index + 1, portsc, t2); + writel(t2, rhub->ports[i]->addr); + xhci_dbg(xhci, "config port %d-%d wake bits, portsc: 0x%x, write: 0x%x\n", + rhub->hcd->self.busnum, i + 1, portsc, t2); } } spin_unlock_irqrestore(&xhci->lock, flags); @@ -983,8 +981,8 @@ int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup) return -EINVAL; /* Clear root port wake on bits if wakeup not allowed. */ - if (!do_wakeup) - xhci_disable_port_wake_on_bits(xhci); + xhci_disable_hub_port_wake(xhci, &xhci->usb3_rhub, do_wakeup); + xhci_disable_hub_port_wake(xhci, &xhci->usb2_rhub, do_wakeup); if (!HCD_HW_ACCESSIBLE(hcd)) return 0;