Re: [PATCH] usb: xhci: Disable runtime PM suspend for quirky controllers.

[Julius Werner]

The policy we want to achieve is to disable runtime PM iff there is a
device connected that doesn't have persist_enabled or a reset_resume()
handler and whose parent/root hub resets on resume, right? So couldn't
we remove the HCD-specific XHCI_RESET_ON_RESUME and set the (existing)
generic USB_QUIRK_RESET_RESUME on the root hub instead? Then we could
handle all of this in the USB core (during device initialization and
when changing persist_enabled through sysfs) by just checking for
udev->reset_resume on all parent hubs of the device in question (and
use pm_runtime_get/put() on said device to prevent its parents from
suspending as appropriate).
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