USB: EHCI: Do not rely on PORT_SUSPEND to stop USB resuming in ehci_bus_resume().

USB: EHCI: Do not rely on PORT_SUSPEND to stop USB resuming in ehci_bus_resume().

commit d0f2fb2500b1c5fe4967eb45d8c9bc758d7aef80 upstream.

From EHCI Spec p.28 HC should clear PORT_SUSPEND when SW clears
PORT_RESUME. In Intel Oaktrail platform, MPH (Multi-Port Host
Controller) core clears PORT_SUSPEND directly when SW sets PORT_RESUME
bit. If we rely on PORT_SUSPEND bit to stop USB resume, we will miss
the action of clearing PORT_RESUME. This will cause unexpected long
resume signal on USB bus.

Signed-off-by: Wang Zhi <zhi.wang@windriver.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>