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EHCI: turn off remote wakeup during shutdown

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This patch (as850b) disables remote wakeup (and everything else!) on
all EHCI ports when the shutdown() method is called.  If remote wakeup
is left active then some systems will reboot instead of powering off.
This fixes Bugzilla #7828.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2007-02-13 14:55:27 -05:00 committed by Greg Kroah-Hartman
parent 8a03d9a498
commit 8903795a52
1 changed files with 17 additions and 0 deletions
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17
drivers/usb/host/ehci-hcd.c
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@ -299,6 +299,19 @@ static void ehci_watchdog (unsigned long param)
spin_unlock_irqrestore (&ehci->lock, flags);
}
/* On some systems, leaving remote wakeup enabled prevents system shutdown.
* The firmware seems to think that powering off is a wakeup event!
* This routine turns off remote wakeup and everything else, on all ports.
*/
static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
{
int port = HCS_N_PORTS(ehci->hcs_params);
while (port--)
ehci_writel(ehci, PORT_RWC_BITS,
&ehci->regs->port_status[port]);
}
/* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
* This forcibly disables dma and IRQs, helping kexec and other cases
* where the next system software may expect clean state.
@ -310,9 +323,13 @@ ehci_shutdown (struct usb_hcd *hcd)
ehci = hcd_to_ehci (hcd);
(void) ehci_halt (ehci);
ehci_turn_off_all_ports(ehci);
/* make BIOS/etc use companion controller during reboot */
ehci_writel(ehci, 0, &ehci->regs->configured_flag);
/* unblock posted writes */
ehci_readl(ehci, &ehci->regs->configured_flag);
}
static void ehci_port_power (struct ehci_hcd *ehci, int is_on)