[PATCH v3 01/10] usb: chipidea: udc: zero-length packet is only needed for TX
From: Peter Chen <hidden>
Date: 2015-08-07 07:15:38
Also in:
linux-arm-kernel
Subsystem:
chipidea usb high speed dual role controller, the rest, usb subsystem · Maintainers:
Peter Chen, Linus Torvalds, Greg Kroah-Hartman
The zero-length packet is the sendor tells the receiver that there is no more data, so it is only needed at the TX side. Signed-off-by: Peter Chen <redacted> --- drivers/usb/chipidea/udc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 2a47720..15f55da 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c@@ -445,7 +445,7 @@ static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq) rest -= count; } - if (hwreq->req.zero && hwreq->req.length + if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX && (hwreq->req.length % hwep->ep.maxpacket == 0)) add_td_to_list(hwep, hwreq, 0);
--
1.9.1
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