usb: cdns3: ep0: Invalidate cache before reading Setup Packet

Invalidate dcache line before accessing Setup Packet contents. Otherwise
driver will see stale content on non coherent architecture.
Signed-off-by: NVignesh Raghavendra <vigneshr@ti.com>

drivers/usb/cdns3/ep0.c

@@ -562,6 +562,10 @@ static void cdns3_ep0_setup_phase(struct cdns3_device *priv_dev)
 	struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
 	int result;
 
+	/* Invalidate Setup Packet received */
+	invalidate_dcache_range(priv_dev->setup_dma,
+				priv_dev->setup_dma + ARCH_DMA_MINALIGN);
+
 	priv_dev->ep0_data_dir = ctrl->bRequestType & USB_DIR_IN;
 
 	trace_cdns3_ctrl_req(ctrl);