This is a note to let you know that I've just added the patch titled
Subject: EHCI: turn off remote wakeup during shutdown
to my gregkh-2.6 tree. Its filename is
ehci-turn-off-remote-wakeup-during-shutdown.patch
This tree can be found at
http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/
>From [EMAIL PROTECTED] Tue Feb 13 11:55:35 2007
From: Alan Stern <[EMAIL PROTECTED]>
Date: Tue, 13 Feb 2007 14:55:27 -0500 (EST)
Subject: EHCI: turn off remote wakeup during shutdown
To: Greg KH <[EMAIL PROTECTED]>
Cc: USB development list <linux-usb-devel@lists.sourceforge.net>, David
Brownell <[EMAIL PROTECTED]>
Message-ID: <[EMAIL PROTECTED]>
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 <[EMAIL PROTECTED]>
Cc: David Brownell <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
drivers/usb/host/ehci-hcd.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
--- gregkh-2.6.orig/drivers/usb/host/ehci-hcd.c
+++ gregkh-2.6/drivers/usb/host/ehci-hcd.c
@@ -302,6 +302,19 @@ static void ehci_watchdog (unsigned long
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.
@@ -313,9 +326,13 @@ 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)
Patches currently in gregkh-2.6 which might be from [EMAIL PROTECTED] are
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