From 56afee9a0c0065d0359aa801f5bd33389bfbb2ee Mon Sep 17 00:00:00 2001
From: Rajesh Bhagat <rajesh.bhagat@freescale.com>
Date: Fri, 20 Nov 2015 12:45:31 +0530
Subject: drivers: dwc3 : Add support for USB snooping

Add support for USB3 snooping by asserting bits
in register DWC3_GSBUSCFG0 for data and descriptor

Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat@freescale.com>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 1f81243..736f79a 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -500,6 +500,10 @@ static int dwc3_probe(struct platform_device *pdev)
 	dwc3_writel(dwc->regs, DWC3_GSBUSCFG1,
 		dwc3_readl(dwc->regs, DWC3_GSBUSCFG1) | 0xf00);
 
+	/* Enable Snooping */
+	dwc3_writel(dwc->regs, DWC3_GSBUSCFG0,
+			dwc3_readl(dwc->regs, DWC3_GSBUSCFG0) | 0x22220000);
+
 	if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
 		dwc->dr_mode = USB_DR_MODE_HOST;
 	else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
-- 
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