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Commit e198a314 authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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EHCI: add delay to bus_resume before accessing ports 



This patch (as870) adds a delay to ehci-hcd's bus_resume routine.
Apparently there are controllers and/or BIOSes out there which need
such a delay to get the ports back into their correct state.  This
fixes Bugzilla #8190.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent eaafbc3a

drivers/usb/host/ehci-hub.c

+4 −0
Original line number Diff line number Diff line
@@ -136,6 +136,10 @@ static int ehci_bus_resume (struct usb_hcd *hcd) 
	/* restore CMD_RUN, framelist size, and irq threshold */

	ehci_writel(ehci, ehci->command, &ehci->regs->command);



	/* Some controller/firmware combinations need a delay during which

	 * they set up the port statuses.  See Bugzilla #8190. */

	mdelay(8);



	/* manually resume the ports we suspended during bus_suspend() */

	i = HCS_N_PORTS (ehci->hcs_params);

	while (i--) {