The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From d6eef886903c4bb5af41b9a31d4ba11dc7a6f8e8 Mon Sep 17 00:00:00 2001

From: Sanket Parmar sparmar@cadence.com Date: Mon, 17 May 2021 17:05:12 +0200 Subject: [PATCH] usb: cdns3: Enable TDL_CHK only for OUT ep

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.... Signed-off-by: Peter Chen peter.chen@kernel.org

diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c index a8b7b50abf64..5281f8d3fb3d 100644 --- a/drivers/usb/cdns3/cdns3-gadget.c +++ b/drivers/usb/cdns3/cdns3-gadget.c @@ -2007,7 +2007,7 @@ static 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); @@ -2046,15 +2046,13 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable) 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: