On Thu, 8 Jun 2017, Yueyao Zhu wrote: > From: Yueyao Zhu <yue...@google.com> > > Currently, if a USB driver would like to enable autosuspend on the USB > device, usb_enable_autosuspend() seems to be the only option. However, > this acts on the device level, and other interfaces might not desire > to autosuspend the USB device. > > For example, for the usb digital audio driver to enable autosuspend on > a device, calling usb_enable_autosuspend() from the interface driver > might not be a good idea as the USB device might have a keyboard HID > interface which generally doesn't handle autosupend very well. > > This patch series introduces an API for interface driver to vote > for autosuspend on the interface, and when all interfaces agree to > it, autosuspend can then be enabled on the usb device.
The whole idea of this seems questionable. USB interface drivers are generally not supposed to enable or disable autosuspend -- that is a policy decision left up to userspace. There are a few exceptions for things like hubs, but this is generally true. Why should the USB digital audio driver want to enable autosuspend? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
