From: lyz <lyz@rock-chips.com>
Date: Tue, 2 Sep 2014 12:34:28 +0000 (+0800)
Subject: rk312x: usb power optimize by turning off differential receiver in suspend mode
X-Git-Tag: firefly_0821_release~4769^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4bcced19103e4c9941b5c284f731712503aaceea;p=firefly-linux-kernel-4.4.55.git

rk312x: usb power optimize by turning off differential receiver in suspend mode
---

diff --git a/drivers/usb/dwc_otg_310/usbdev_rk3126.c b/drivers/usb/dwc_otg_310/usbdev_rk3126.c
index b14679996572..4f7326ff6eb9 100755
--- a/drivers/usb/dwc_otg_310/usbdev_rk3126.c
+++ b/drivers/usb/dwc_otg_310/usbdev_rk3126.c
@@ -6,6 +6,9 @@ static struct dwc_otg_control_usb *control_usb;
 #ifdef CONFIG_USB20_OTG
 static void usb20otg_hw_init(void)
 {
+	/* Turn off differential receiver in suspend mode */
+	writel(UOC_HIWORD_UPDATE(0, 1, 2),
+		   RK_GRF_VIRT + RK312X_GRF_USBPHY1_CON6);
 	/* other haredware init,include:
 	 * DRV_VBUS GPIO init */
 	if (gpio_is_valid(control_usb->otg_gpios->gpio)) {
@@ -210,8 +213,12 @@ struct dwc_otg_platform_data usb20otg_pdata_rk3126 = {
 #ifdef CONFIG_USB20_HOST
 static void usb20host_hw_init(void)
 {
+	/* Switch to DWC HOST */
 	writel(UOC_HIWORD_UPDATE(1, 1, 3),
 		   RK_GRF_VIRT + RK312X_GRF_SOC_CON2);
+	/* Turn off differential receiver in suspend mode */
+	writel(UOC_HIWORD_UPDATE(0, 1, 2),
+		   RK_GRF_VIRT + RK312X_GRF_USBPHY0_CON6);
 	/* other haredware init,include:
 	 * DRV_VBUS GPIO init */
 	if (gpio_is_valid(control_usb->host_gpios->gpio)) {