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ehci: Check individual port status registers on resume 

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 <mjg@redhat.com>
Cc: stable <stable@kernel.org> [after .39-rc1 is out]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Matthew Garrett 2011-01-11 12:26:48 -05:00 committed by Greg Kroah-Hartman
parent 0fd857ae09
commit 294d95f2cb
1 changed files with 22 additions and 1 deletions
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23
drivers/usb/host/ehci-hub.c
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@ -106,6 +106,27 @@ static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
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_flags(struct ehci_hcd *ehci,
}
/* 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);