[PATCH 2/8] usb: dwc3: add dis_u2_freeclk_exists_quirk

[Frank Wang]

Add a quirk to clear the GUSB2PHYCFG.U2_FREECLK_EXISTS bit,
which specifies whether the USB2.0 PHY provides a free-running
PHY clock, which is active when the clock control input is active.

Refer to commit 27f83eeb6b42("usb: dwc3: add dis_u2_freeclk_exists_quirk")
in Linux Rockchip Kernel.

Signed-off-by: Frank Wang <frank.wang at rock-chips.com>
---
 drivers/usb/dwc3/core.c | 6 ++++++
 drivers/usb/dwc3/core.h | 2 ++
 include/dwc3-uboot.h    | 1 +
 3 files changed, 9 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index a80e7d54aa..3c81a07dad 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -398,6 +398,9 @@ static void dwc3_phy_setup(struct dwc3 *dwc)
 	if (dwc->dis_enblslpm_quirk)
 		reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
 
+	if (dwc->dis_u2_freeclk_exists_quirk)
+		reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;
+
 	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 
 	mdelay(100);
@@ -719,6 +722,7 @@ int dwc3_uboot_init(struct dwc3_device *dwc3_dev)
 	dwc->dis_u3_susphy_quirk = dwc3_dev->dis_u3_susphy_quirk;
 	dwc->dis_u2_susphy_quirk = dwc3_dev->dis_u2_susphy_quirk;
 	dwc->dis_enblslpm_quirk = dwc3_dev->dis_enblslpm_quirk;
+	dwc->dis_u2_freeclk_exists_quirk = dwc3_dev->dis_u2_freeclk_exists_quirk;
 
 	dwc->tx_de_emphasis_quirk = dwc3_dev->tx_de_emphasis_quirk;
 	if (dwc3_dev->tx_de_emphasis)
@@ -981,6 +985,8 @@ void dwc3_of_parse(struct dwc3 *dwc)
 				"snps,dis_u2_susphy_quirk");
 	dwc->dis_enblslpm_quirk = dev_read_bool(dev,
 				"snps,dis_enblslpm_quirk");
+	dwc->dis_u2_freeclk_exists_quirk = dev_read_bool(dev,
+				"snps,dis-u2-freeclk-exists-quirk");
 	dwc->tx_de_emphasis_quirk = dev_read_bool(dev,
 				"snps,tx_de_emphasis_quirk");
 	tmp = dev_read_u8_array_ptr(dev, "snps,tx_de_emphasis", 1);
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index eabbc30f25..86a697d1bd 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -161,6 +161,7 @@
 
 /* Global USB2 PHY Configuration Register */
 #define DWC3_GUSB2PHYCFG_PHYSOFTRST	(1 << 31)
+#define DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS	(1 << 30)
 #define DWC3_GUSB2PHYCFG_SUSPHY		(1 << 6)
 #define DWC3_GUSB2PHYCFG_PHYIF(n)	((n) << 3)
 #define DWC3_GUSB2PHYCFG_PHYIF_MASK	DWC3_GUSB2PHYCFG_PHYIF(1)
@@ -822,6 +823,7 @@ struct dwc3 {
 	unsigned		dis_u3_susphy_quirk:1;
 	unsigned		dis_u2_susphy_quirk:1;
 	unsigned		dis_enblslpm_quirk:1;
+	unsigned		dis_u2_freeclk_exists_quirk:1;
 
 	unsigned		tx_de_emphasis_quirk:1;
 	unsigned		tx_de_emphasis:2;
diff --git a/include/dwc3-uboot.h b/include/dwc3-uboot.h
index fd3f173c37..952ad64c35 100644
--- a/include/dwc3-uboot.h
+++ b/include/dwc3-uboot.h
@@ -33,6 +33,7 @@ struct dwc3_device {
 	unsigned dis_u3_susphy_quirk;
 	unsigned dis_u2_susphy_quirk;
 	unsigned dis_enblslpm_quirk;
+	unsigned dis_u2_freeclk_exists_quirk;
 	unsigned tx_de_emphasis_quirk;
 	unsigned tx_de_emphasis;
 	int index;
-- 
2.17.1