From b0efb9ece88d5c5f32fe52260251b24ae6ab7692 Mon Sep 17 00:00:00 2001
From: Thinh Nguyen <thinh.nguyen@synopsys.com>
Date: Wed, 7 Nov 2018 18:10:30 -0800
Subject: [PATCH] UPSTREAM: usb: dwc3: Set GUSB2PHYCFG.ENBLSLPM

GUSB2PHYCFG.ENBLSLPM enables the controller to assert low power signals
to the PHY. Unless disabled via device property, explicitly set
GUSB2PHYCFG.ENBLSLPM as it may not be set by default.

Change-Id: Id31448c50898a8924e3630ca57d710d886ea000b
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: William Wu <william.wu@rock-chips.com>
(cherry picked from commit eafeacf1196447dac0b8c40e77e96a81b74b8f7f)
---
 drivers/usb/dwc3/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index fa6df9fbf005..1fc6ce73e407 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -661,6 +661,8 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
 
 	if (dwc->dis_enblslpm_quirk)
 		reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
+	else
+		reg |= DWC3_GUSB2PHYCFG_ENBLSLPM;
 
 	if (dwc->dis_u2_freeclk_exists_quirk)
 		reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;