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USB: ohci-at91: fix power management hanging

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A hanging has been detected in ohci-at91 while going in suspend to ram. This is
due to asynchronous operations between ohci reset and ohci clocks shutdown.
This patch adds the reading of the control register between the reset of the
ohci and clocks stop. This "flush the writes" idea was taken from ohci-hcd.c
file (ohci_shutdown() function).

Signed-off-by: Patrice Vilchez <patrice.vilchez@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Patrice Vilchez 2010-04-28 13:45:40 +02:00 committed by Greg Kroah-Hartman
parent 073900a28d
commit 869aa98c1d
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/host/ohci-at91.c
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@ -331,6 +331,8 @@ ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
*/
if (at91_suspend_entering_slow_clock()) {
ohci_usb_reset (ohci);
/* flush the writes */
(void) ohci_readl (ohci, &ohci->regs->control);
at91_stop_clock();
}