The dedicated dmac can transfer a zero-length-packet (zlp) if some bits
of the USB_COM_CON register. However, the commit 2d4aa21a73ba ("usb:
gadget: udc: renesas_usb3: add support for dedicated DMAC") didn't set
the bits to 1. So, this patch fixes it.
Fixes: 2d4aa21a73b ("usb: gadget: udc: renesas_usb3: add support for dedicated DMAC)
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
drivers/usb/gadget/udc/renesas_usb3.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
index 923ad5a..1cc5f0d 100644
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -89,6 +89,9 @@
/* USB_COM_CON */
#define USB_COM_CON_CONF BIT(24)
+#define USB_COM_CON_PN_WDATAIF_NL BIT(23)
+#define USB_COM_CON_PN_RDATAIF_NL BIT(22)
+#define USB_COM_CON_PN_LSTTR_PP BIT(21)
#define USB_COM_CON_SPD_MODE BIT(17)
#define USB_COM_CON_EP0_EN BIT(16)
#define USB_COM_CON_DEV_ADDR_SHIFT 8
@@ -686,6 +689,9 @@ static void renesas_usb3_init_controller(struct renesas_usb3 *usb3)
{
usb3_init_axi_bridge(usb3);
usb3_init_epc_registers(usb3);
+ usb3_set_bit(usb3, USB_COM_CON_PN_WDATAIF_NL |
+ USB_COM_CON_PN_RDATAIF_NL | USB_COM_CON_PN_LSTTR_PP,
+ USB3_USB_COM_CON);
usb3_write(usb3, USB_OTG_IDMON, USB3_USB_OTG_INT_STA);
usb3_write(usb3, USB_OTG_IDMON, USB3_USB_OTG_INT_ENA);
--
1.9.1
