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@xxxxxxx>
---
drivers/usb/cdns3/gadget.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
index f1626df65255..1df4ee2857e9 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;
--
2.17.1
