From 95d2b0370d3ce21796b98b41d166f6524e3610c6 Mon Sep 17 00:00:00 2001 From: Vahram Aharonyan Date: Mon, 14 Nov 2016 19:16:46 -0800 Subject: [PATCH] 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 Signed-off-by: John Youn Signed-off-by: Felipe Balbi --- drivers/usb/dwc2/gadget.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index 9f2875661bbd..d2442f421485 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/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); } -- 2.20.1