From 886ee36e7205a7b850e2e5c2298a479f581f9b3b Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Thu, 14 Dec 2017 09:50:39 +0200 Subject: usb: core: add support for USB_REQ_SET_ISOCH_DELAY USB SS and SSP hubs provide wHubDelay values on their hub descriptor which we should inform the USB Device about. The USB Specification 3.0 explains, on section 9.4.11, how to calculate the value and how to issue the request. Note that a USB_REQ_SET_ISOCH_DELAY is valid on all device states (Default, Address, Configured), we just *chose* to issue it from Address state right after successfully fetching the USB Device Descriptor. Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/usb.h | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/usb/core/usb.h') diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h index 2bee08d084ae..149cc7480971 100644 --- a/drivers/usb/core/usb.h +++ b/drivers/usb/core/usb.h @@ -40,6 +40,7 @@ extern int usb_remove_device(struct usb_device *udev); extern int usb_get_device_descriptor(struct usb_device *dev, unsigned int size); +extern int usb_set_isoch_delay(struct usb_device *dev); extern int usb_get_bos_descriptor(struct usb_device *dev); extern void usb_release_bos_descriptor(struct usb_device *dev); extern char *usb_cache_string(struct usb_device *udev, int index); -- cgit