usb: cdns3: Enable TDL_CHK only for OUT ep

BugLink: https://bugs.launchpad.net/bugs/1939442
commit d6eef886903c4bb5af41b9a31d4ba11dc7a6f8e8 upstream.

ZLP gets stuck if TDL_CHK bit is set and TDL_FROM_TRB is used
as TDL source for IN endpoints. To fix it, TDL_CHK is only
enabled for OUT endpoints.

Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
Reported-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Sanket Parmar <sparmar@cadence.com>
Link: https://lore.kernel.org/r/1621263912-13175-1-git-send-email-sparmar@cadence.com
Signed-off-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
index f32f00c495713c29c8d2492771e1f3f499a994f1..c3bf54cc530f99a82b534ce7cf9f4639320c94be 100644 (file)
--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -1531,7 +1531,7 @@ void cdns3_configure_dmult(struct cdns3_device *priv_dev,
                else
                        mask = BIT(priv_ep->num);
 
-               if (priv_ep->type != USB_ENDPOINT_XFER_ISOC) {
+               if (priv_ep->type != USB_ENDPOINT_XFER_ISOC  && !priv_ep->dir) {
                        cdns3_set_register_bit(&regs->tdl_from_trb, mask);
                        cdns3_set_register_bit(&regs->tdl_beh, mask);
                        cdns3_set_register_bit(&regs->tdl_beh2, mask);
@@ -1569,15 +1569,13 @@ void cdns3_ep_config(struct cdns3_endpoint *priv_ep)
        case USB_ENDPOINT_XFER_INT:
                ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_INT);
 
-               if ((priv_dev->dev_ver == DEV_VER_V2 && !priv_ep->dir) ||
-                   priv_dev->dev_ver > DEV_VER_V2)
+               if (priv_dev->dev_ver >= DEV_VER_V2 && !priv_ep->dir)
                        ep_cfg |= EP_CFG_TDL_CHK;
                break;
        case USB_ENDPOINT_XFER_BULK:
                ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_BULK);
 
-               if ((priv_dev->dev_ver == DEV_VER_V2  && !priv_ep->dir) ||
-                   priv_dev->dev_ver > DEV_VER_V2)
+               if (priv_dev->dev_ver >= DEV_VER_V2 && !priv_ep->dir)
                        ep_cfg |= EP_CFG_TDL_CHK;
                break;
        default: