From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932348Ab1CUX2p (ORCPT ); Mon, 21 Mar 2011 19:28:45 -0400 Received: from kroah.org ([198.145.64.141]:52619 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932265Ab1CUXR5 (ORCPT ); Mon, 21 Mar 2011 19:17:57 -0400 X-Mailbox-Line: From gregkh@clark.kroah.org Mon Mar 21 16:03:25 2011 Message-Id: <20110321230325.078694429@clark.kroah.org> User-Agent: quilt/0.48-16.4 Date: Mon, 21 Mar 2011 16:01:49 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Matthew Garrett Subject: [33/78] ehci: Check individual port status registers on resume In-Reply-To: <20110321230346.GA14681@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.38-stable review patch. If anyone has any objections, please let us know. ------------------ From: Matthew Garrett commit 294d95f2cbc2aef5346258f216cd9df570e271a5 upstream. If a device plug/unplug is detected on an ATI SB700 USB controller in D3, it appears to set the port status register but not the controller status register. As a result we'll fail to detect the plug event. Check the port status register on resume as well in order to catch this case. Signed-off-by: Matthew Garrett Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ehci-hub.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -106,6 +106,27 @@ static void ehci_handover_companion_port ehci->owned_ports = 0; } +static int ehci_port_change(struct ehci_hcd *ehci) +{ + int i = HCS_N_PORTS(ehci->hcs_params); + + /* First check if the controller indicates a change event */ + + if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD) + return 1; + + /* + * Not all controllers appear to update this while going from D3 to D0, + * so check the individual port status registers as well + */ + + while (i--) + if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC) + return 1; + + return 0; +} + static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci, bool suspending, bool do_wakeup) { @@ -173,7 +194,7 @@ static void ehci_adjust_port_wakeup_flag } /* Does the root hub have a port wakeup pending? */ - if (!suspending && (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)) + if (!suspending && ehci_port_change(ehci)) usb_hcd_resume_root_hub(ehci_to_hcd(ehci)); spin_unlock_irqrestore(&ehci->lock, flags);