usb: mtu3: enable SETUPENDISR interrupt

If the controller receives a new SETUP during SETUP data stage,
and will generate SETUPENDISR interrupt, the driver should abort
the current SETUP command and process the new one.
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/mtu3/mtu3_core.c

@@ -484,7 +484,7 @@ void mtu3_ep0_setup(struct mtu3 *mtu)
 	mtu3_writel(mtu->mac_base, U3D_EP0CSR, csr);
 
 	/* Enable EP0 interrupt */
-	mtu3_writel(mtu->mac_base, U3D_EPIESR, EP0ISR);
+	mtu3_writel(mtu->mac_base, U3D_EPIESR, EP0ISR | SETUPENDISR);
 }
 
 static int mtu3_mem_alloc(struct mtu3 *mtu)

drivers/usb/mtu3/mtu3_gadget_ep0.c

@@ -692,9 +692,13 @@ irqreturn_t mtu3_ep0_isr(struct mtu3 *mtu)
 	mtu3_writel(mbase, U3D_EPISR, int_status); /* W1C */
 
 	/* only handle ep0's */
-	if (!(int_status & EP0ISR))
+	if (!(int_status & (EP0ISR | SETUPENDISR)))
 		return IRQ_NONE;
 
+	/* abort current SETUP, and process new one */
+	if (int_status & SETUPENDISR)
+		mtu->ep0_state = MU3D_EP0_STATE_SETUP;
+
 	csr = mtu3_readl(mbase, U3D_EP0CSR);
 
 	dev_dbg(mtu->dev, "%s csr=0x%x\n", __func__, csr);

drivers/usb/mtu3/mtu3_hw_regs.h

@@ -104,6 +104,7 @@
 
 /* U3D_EPISR */
 #define EPRISR(x)		(BIT(16) << (x))
+#define SETUPENDISR		BIT(16)
 #define EPTISR(x)		(BIT(0) << (x))
 #define EP0ISR			BIT(0)