Commit 294d95f2 authored by Matthew Garrett's avatar Matthew Garrett Committed by Greg Kroah-Hartman
Browse files

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: default avatarMatthew Garrett <mjg@redhat.com>
Cc: stable <stable@kernel.org> [after .39-rc1 is out]
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 0fd857ae

drivers/usb/host/ehci-hub.c

+22 −1
Original line number Diff line number Diff line
@@ -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);

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