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-rw-r--r--include/linux/usb.h18
1 files changed, 13 insertions, 5 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 8c9f053111bb..ce1323c4e47c 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -1055,7 +1055,8 @@ typedef void (*usb_complete_t)(struct urb *);
1055 * @number_of_packets: Lists the number of ISO transfer buffers. 1055 * @number_of_packets: Lists the number of ISO transfer buffers.
1056 * @interval: Specifies the polling interval for interrupt or isochronous 1056 * @interval: Specifies the polling interval for interrupt or isochronous
1057 * transfers. The units are frames (milliseconds) for full and low 1057 * transfers. The units are frames (milliseconds) for full and low
1058 * speed devices, and microframes (1/8 millisecond) for highspeed ones. 1058 * speed devices, and microframes (1/8 millisecond) for highspeed
1059 * and SuperSpeed devices.
1059 * @error_count: Returns the number of ISO transfers that reported errors. 1060 * @error_count: Returns the number of ISO transfers that reported errors.
1060 * @context: For use in completion functions. This normally points to 1061 * @context: For use in completion functions. This normally points to
1061 * request-specific driver context. 1062 * request-specific driver context.
@@ -1286,9 +1287,16 @@ static inline void usb_fill_bulk_urb(struct urb *urb,
1286 * 1287 *
1287 * Initializes a interrupt urb with the proper information needed to submit 1288 * Initializes a interrupt urb with the proper information needed to submit
1288 * it to a device. 1289 * it to a device.
1289 * Note that high speed interrupt endpoints use a logarithmic encoding of 1290 *
1290 * the endpoint interval, and express polling intervals in microframes 1291 * Note that High Speed and SuperSpeed interrupt endpoints use a logarithmic
1291 * (eight per millisecond) rather than in frames (one per millisecond). 1292 * encoding of the endpoint interval, and express polling intervals in
1293 * microframes (eight per millisecond) rather than in frames (one per
1294 * millisecond).
1295 *
1296 * Wireless USB also uses the logarithmic encoding, but specifies it in units of
1297 * 128us instead of 125us. For Wireless USB devices, the interval is passed
1298 * through to the host controller, rather than being translated into microframe
1299 * units.
1292 */ 1300 */
1293static inline void usb_fill_int_urb(struct urb *urb, 1301static inline void usb_fill_int_urb(struct urb *urb,
1294 struct usb_device *dev, 1302 struct usb_device *dev,
@@ -1305,7 +1313,7 @@ static inline void usb_fill_int_urb(struct urb *urb,
1305 urb->transfer_buffer_length = buffer_length; 1313 urb->transfer_buffer_length = buffer_length;
1306 urb->complete = complete_fn; 1314 urb->complete = complete_fn;
1307 urb->context = context; 1315 urb->context = context;
1308 if (dev->speed == USB_SPEED_HIGH) 1316 if (dev->speed == USB_SPEED_HIGH || dev->speed == USB_SPEED_SUPER)
1309 urb->interval = 1 << (interval - 1); 1317 urb->interval = 1 << (interval - 1);
1310 else 1318 else
1311 urb->interval = interval; 1319 urb->interval = interval;