linux-kernel - [PATCH v5 5/8] usb: dwc3: don't issue no-op trb for stream capable endpoints

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Message-ID: <1537021801-23896-6-git-send-email-anurag.kumar.vulisha@xilinx.com>
Date:   Sat, 15 Sep 2018 19:59:58 +0530
From:   Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>
To:     <balbi@...nel.org>, <gregkh@...uxfoundation.org>
CC:     <v.anuragkumar@...il.com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <Thinh.Nguyen@...opsys.com>,
        <apandey@...inx.com>,
        Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>
Subject: [PATCH v5 5/8] usb: dwc3: don't issue no-op trb for stream capable endpoints

The stream capable endpoints require stream id to be given
when issuing START TRANSFER. While issuing no-op trb the
stream id is not yet known, so don't issue no-op trb's on
stream capable endpoints.

Signed-off-by: Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>
Reviewed-by: Thinh Nguyen <thinhn@...opsys.com>
---
 changes in v5:
	1. None

 Changes in v4:
	1. None

 Changes in v3:
	1. None

 Changes in v2:
	1. None
---
 drivers/usb/dwc3/gadget.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index e18f9b9..b2d68f1 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -677,7 +677,7 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action)
 	 * Issue StartTransfer here with no-op TRB so we can always rely on No
 	 * Response Update Transfer command.
 	 */
-	if (usb_endpoint_xfer_bulk(desc) ||
+	if ((usb_endpoint_xfer_bulk(desc) && !dep->stream_capable) ||
 			usb_endpoint_xfer_int(desc)) {
 		struct dwc3_gadget_ep_cmd_params params;
 		struct dwc3_trb	*trb;
-- 
2.1.1