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USB: EHCI: add delay during suspend to prevent erroneous wakeups

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High-speed USB connections revert back to full-speed signalling when
the device goes into suspend.  This takes several milliseconds, and
during that time it's not possible to tell reliably whether the device
has been disconnected.

On some platforms, the Wake-On-Disconnect circuitry gets confused
during this intermediate state.  It generates a false wakeup signal,
which can prevent the controller from going to sleep.

To avoid this problem, this patch adds a 5-ms delay to the
ehci_bus_suspend() routine if any ports have to switch over to
full-speed signalling.  (Actually, the delay was already present for
devices using a particular kind of PHY power management; the patch
merely causes the delay to be used more widely.)

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reviewed-by: Peter Chen <Peter.Chen@freescale.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2014-02-13 15:49:17 -05:00 committed by Greg Kroah-Hartman
parent 6d0abeca32
commit 3e8d6d85ad
1 changed files with 22 additions and 4 deletions
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26
drivers/usb/host/ehci-hub.c
View file

@ -238,6 +238,7 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
int port;
int mask;
int changed;
bool fs_idle_delay;
ehci_dbg(ehci, "suspend root hub\n");
@ -272,6 +273,7 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
ehci->bus_suspended = 0;
ehci->owned_ports = 0;
changed = 0;
fs_idle_delay = false;
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *reg = &ehci->regs->port_status [port];
@ -300,16 +302,32 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
}
if (t1 != t2) {
/*
* On some controllers, Wake-On-Disconnect will
* generate false wakeup signals until the bus
* switches over to full-speed idle. For their
* sake, add a delay if we need one.
*/
if ((t2 & PORT_WKDISC_E) &&
ehci_port_speed(ehci, t2) ==
USB_PORT_STAT_HIGH_SPEED)
fs_idle_delay = true;
ehci_writel(ehci, t2, reg);
changed = 1;
}
}
spin_unlock_irq(&ehci->lock);
if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
/*
* Wait for HCD to enter low-power mode or for the bus
* to switch to full-speed idle.
*/
usleep_range(5000, 5500);
}
if (changed && ehci->has_tdi_phy_lpm) {
spin_unlock_irq(&ehci->lock);
msleep(5); /* 5 ms for HCD to enter low-power mode */
spin_lock_irq(&ehci->lock);
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
@ -322,8 +340,8 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
port, (t3 & HOSTPC_PHCD) ?
"succeeded" : "failed");
}
spin_unlock_irq(&ehci->lock);
}
spin_unlock_irq(&ehci->lock);
/* Apparently some devices need a >= 1-uframe delay here */
if (ehci->bus_suspended)