linux-kernel - [PATCH 1/1] usb: cdns3: skip set TRB_IOC when usb_request: no

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Date:   Fri, 27 Oct 2023 14:39:19 -0400
From:   Frank Li <Frank.Li@....com>
To:     imx@...ts.linux.dev, Peter Chen <peter.chen@...nel.org>,
        Pawel Laszczak <pawell@...ence.com>,
        Roger Quadros <rogerq@...nel.org>,
        Aswath Govindraju <a-govindraju@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org (open list:CADENCE USB3 DRD IP DRIVER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/1] usb: cdns3: skip set TRB_IOC when usb_request: no_interrupt is true

No completion irq is needed if no_interrupt is true. Needn't set TRB_IOC
at this case.

Check usb_request: no_interrupt and set/skip TRB_IOC in
cdns3_ep_run_transfer().

Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/usb/cdns3/cdns3-gadget.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
index 69a44bd7e5d02..cd08897f8da8b 100644
--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -1124,6 +1124,7 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 	u16 total_tdl = 0;
 	struct scatterlist *s = NULL;
 	bool sg_supported = !!(request->num_mapped_sgs);
+	u32 ioc = request->no_interrupt ? 0 : TRB_IOC;
 
 	if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
 		num_trb = priv_ep->interval;
@@ -1233,11 +1234,11 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 			control |= pcs;
 
 		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC  && !priv_ep->dir) {
-			control |= TRB_IOC | TRB_ISP;
+			control |= ioc | TRB_ISP;
 		} else {
 			/* for last element in TD or in SG list */
 			if (sg_iter == (num_trb - 1) && sg_iter != 0)
-				control |= pcs | TRB_IOC | TRB_ISP;
+				control |= pcs | ioc | TRB_ISP;
 		}
 
 		if (sg_iter)
@@ -1268,7 +1269,7 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 	priv_req->num_of_trb = num_trb;
 
 	if (sg_iter == 1)
-		trb->control |= cpu_to_le32(TRB_IOC | TRB_ISP);
+		trb->control |= cpu_to_le32(ioc | TRB_ISP);
 
 	if (priv_dev->dev_ver < DEV_VER_V2 &&
 	    (priv_ep->flags & EP_TDLCHK_EN)) {
-- 
2.34.1