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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>
This commit is contained in:
Vahram Aharonyan 2016-11-14 19:16:46 -08:00 committed by Felipe Balbi
parent ec01f0b231
commit 95d2b0370d
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/dwc2/gadget.c
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@ -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);
}