USB: EHCI: add no_io_watchdog platform_data parameter to ehci-platform

Enhance the ehci-platform driver to also accept no_io_watchdog as a platform
data parameter. When no_io_watchdog is set to 1, the ehci controller will set
ehci->need_io_watchdog to 0. Since most EHCI controllers do need the I/O
watchdog to be on, only let those which need it to turn the watchdog off.

Make sure that we change need_io_watchdog after the call to ehci_setup()
because ehci_setup() will unconditionnaly set need_io_watchdog to 1.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-platform.c

@@ -38,6 +38,8 @@ static int ehci_platform_reset(struct usb_hcd *hcd)
 	if (retval)
 		return retval;
 
+	if (pdata->no_io_watchdog)
+		ehci->need_io_watchdog = 0;
 	if (pdata->port_power_on)
 		ehci_port_power(ehci, 1);
 	if (pdata->port_power_off)

include/linux/usb/ehci_pdriver.h

@@ -29,6 +29,8 @@
  *			initialization.
  * @port_power_off:	set to 1 if the controller needs to be powered down
  *			after initialization.
+ * @no_io_watchdog:	set to 1 if the controller does not need the I/O
+ *			watchdog to run.
  *
  * These are general configuration options for the EHCI controller. All of
  * these options are activating more or less workarounds for some hardware.
@@ -41,6 +43,7 @@ struct usb_ehci_pdata {
 	unsigned	big_endian_mmio:1;
 	unsigned	port_power_on:1;
 	unsigned	port_power_off:1;
+	unsigned	no_io_watchdog:1;
 
 	/* Turn on all power and clocks */
 	int (*power_on)(struct platform_device *pdev);