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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: Alan Stern <stern@rowland.harvard.edu> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -136,6 +136,10 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
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/* restore CMD_RUN, framelist size, and irq threshold */
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ehci_writel(ehci, ehci->command, &ehci->regs->command);
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/* Some controller/firmware combinations need a delay during which
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* they set up the port statuses. See Bugzilla #8190. */
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mdelay(8);
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/* manually resume the ports we suspended during bus_suspend() */
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i = HCS_N_PORTS (ehci->hcs_params);
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while (i--) {
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