usb: cdns3: gadget: add CHAIN and ISP bit for sg list use case
For sg buffer list use case, we need to add ISP for each TRB, and
add CHAIN bit for each TRB except for the last TRB.
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
index d33947d2..50aa993 100644
--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -1220,8 +1220,14 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
else
priv_req->trb->control = cpu_to_le32(control);
- if (sg_supported)
+ if (sg_supported) {
+ trb->control |= TRB_ISP;
+ /* Don't set chain bit for last TRB */
+ if (sg_iter < num_trb - 1)
+ trb->control |= TRB_CHAIN;
+
s = sg_next(s);
+ }
control = 0;
++sg_iter;