usb: dwc3: ep0: implement support for Set Isoch Delay request

This is basically a noop for DWC3. We don't have
to do anything. Basically we test if the request
parameters are correct, cache the Isochronous
Delay and return success.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 39fbd15..ef28bd5 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -575,6 +575,7 @@
  * @setup_packet_pending: true when there's a Setup Packet in FIFO. Workaround
  * @needs_fifo_resize: not all users might want fifo resizing, flag it
  * @resize_fifos: tells us it's ok to reconfigure our TxFIFO sizes.
+ * @isoch_delay: wValue from Set Isochronous Delay request;
  * @u2sel: parameter from Set SEL request.
  * @u2pel: parameter from Set SEL request.
  * @u1sel: parameter from Set SEL request.
@@ -645,6 +646,7 @@
 	enum dwc3_link_state	link_state;
 	enum dwc3_device_state	dev_state;
 
+	u16			isoch_delay;
 	u16			u2sel;
 	u16			u2pel;
 	u8			u1sel;