usb: dwc3: gadget: Disable CSP for stream OUT ep

In stream mode, when fast-forwarding TRBs, the stream number
is not cleared causing the new stream to not get assigned. So
we don't want controller to carry on transfers when short packet
is received. So disable the CSP for stream capable endpoint.

This is based on the 3.30a Programming guide, where table 3-1
device descriptor structure field definitions says for CSP bit
If this bit is 0, the controller generates an XferComplete event
and remove the stream. So if we keep CSP as 1 then switching between
streams would not happen as in stream mode, when fast-forwarding
TRBs, the stream number is not cleared causing the new stream to not get
assigned.

Signed-off-by: Tejas Joglekar <joglekar@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index e2caf9eec30a5708bcf52da6da5b9d2e05d70490..2ecde30ad0b70f4b70f4562453941f31b85ee2fd 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -986,9 +986,13 @@ static void __dwc3_prepare_one_trb(struct dwc3_ep *dep, struct dwc3_trb *trb,
                                usb_endpoint_type(dep->endpoint.desc));
        }
 
-       /* always enable Continue on Short Packet */
+       /*
+        * Enable Continue on Short Packet
+        * when endpoint is not a stream capable
+        */
        if (usb_endpoint_dir_out(dep->endpoint.desc)) {
-               trb->ctrl |= DWC3_TRB_CTRL_CSP;
+               if (!dep->stream_capable)
+                       trb->ctrl |= DWC3_TRB_CTRL_CSP;
 
                if (short_not_ok)
                        trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;