usb: dwc2: gadget: Adjust ISOC OUT request's actual len for DDMA

In DDMA mode if programmed ISOC OUT transfer length is not DWORD
aligned, after closing descriptor HW leaves value of 4 - (ureq->length %
4) in the RX bytes. This is caused because DMA works using 4B chunks.
Example: if length = 9 and all 9 bytes were received from the bus, after
xfercomplete rx_bytes value is 3. Hence add this value to the amount of
transferred bytes.

Signed-off-by: Vahram Aharonyan <vahrama@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc2/gadget.c

@@ -2001,6 +2001,10 @@ static void dwc2_gadget_complete_isoc_request_ddma(struct dwc2_hsotg_ep *hs_ep)
 	ureq->actual = ureq->length -
 		       ((desc_sts & mask) >> DEV_DMA_ISOC_NBYTES_SHIFT);
 
+	/* Adjust actual length for ISOC Out if length is not align of 4 */
+	if (!hs_ep->dir_in && ureq->length & 0x3)
+		ureq->actual += 4 - (ureq->length & 0x3);
+
 	dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);
 }