[PATCH v6 12/15] phy: tegra: xusb: Tegra210 host mode VBUS control

[JC Kuo]

To support XUSB host controller ELPG, this commit moves VBUS control
.phy_power_on()/.phy_power_off() to .phy_init()/.phy_exit().
When XUSB host controller enters ELPG, host driver invokes
.phy_power_off(), VBUS should remain ON so that USB devices will not
disconnect. VBUS can be turned OFF when host driver invokes
.phy_exit() which indicates disabling a USB port.

Signed-off-by: JC Kuo <jc...@nvidia.com>
Acked-by: Thierry Reding <tred...@nvidia.com>
---
v6:
   no change
v5:
   no change
v4:
   no change
v3:
   new, was a part of "phy: tegra: xusb: Add wake/sleepwalk for Tegra210"

 drivers/phy/tegra/xusb-tegra210.c | 52 ++++++++++++++++++++++++-------
 1 file changed, 40 insertions(+), 12 deletions(-)

diff --git a/drivers/phy/tegra/xusb-tegra210.c 
b/drivers/phy/tegra/xusb-tegra210.c
index 8af73ba78ad7..9d39f812fb43 100644
--- a/drivers/phy/tegra/xusb-tegra210.c
+++ b/drivers/phy/tegra/xusb-tegra210.c
@@ -1819,8 +1819,25 @@ static int tegra210_usb2_phy_init(struct phy *phy)
 {
        struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
        struct tegra_xusb_padctl *padctl = lane->pad->padctl;
+       unsigned int index = lane->index;
+       struct tegra_xusb_usb2_port *port;
+       int err;
        u32 value;
 
+       port = tegra_xusb_find_usb2_port(padctl, index);
+       if (!port) {
+               dev_err(&phy->dev, "no port found for USB2 lane %u\n", index);
+               return -ENODEV;
+       }
+
+       if (port->supply && port->mode == USB_DR_MODE_HOST) {
+               err = regulator_enable(port->supply);
+               if (err)
+                       return err;
+       }
+
+       mutex_lock(&padctl->lock);
+
        value = padctl_readl(padctl, XUSB_PADCTL_USB2_PAD_MUX);
        value &= ~(XUSB_PADCTL_USB2_PAD_MUX_USB2_BIAS_PAD_MASK <<
                   XUSB_PADCTL_USB2_PAD_MUX_USB2_BIAS_PAD_SHIFT);
@@ -1828,11 +1845,30 @@ static int tegra210_usb2_phy_init(struct phy *phy)
                 XUSB_PADCTL_USB2_PAD_MUX_USB2_BIAS_PAD_SHIFT;
        padctl_writel(padctl, value, XUSB_PADCTL_USB2_PAD_MUX);
 
+       mutex_unlock(&padctl->lock);
+
        return 0;
 }
 
 static int tegra210_usb2_phy_exit(struct phy *phy)
 {
+       struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
+       struct tegra_xusb_padctl *padctl = lane->pad->padctl;
+       struct tegra_xusb_usb2_port *port;
+       int err;
+
+       port = tegra_xusb_find_usb2_port(padctl, lane->index);
+       if (!port) {
+               dev_err(&phy->dev, "no port found for USB2 lane %u\n", 
lane->index);
+               return -ENODEV;
+       }
+
+       if (port->supply && port->mode == USB_DR_MODE_HOST) {
+               err = regulator_disable(port->supply);
+               if (err)
+                       return err;
+       }
+
        return 0;
 }
 
@@ -1953,6 +1989,8 @@ static int tegra210_usb2_phy_power_on(struct phy *phy)
 
        priv = to_tegra210_xusb_padctl(padctl);
 
+       mutex_lock(&padctl->lock);
+
        if (port->usb3_port_fake != -1) {
                value = padctl_readl(padctl, XUSB_PADCTL_SS_PORT_MAP);
                value &= ~XUSB_PADCTL_SS_PORT_MAP_PORTX_MAP_MASK(
@@ -2046,14 +2084,6 @@ static int tegra210_usb2_phy_power_on(struct phy *phy)
        padctl_writel(padctl, value,
                      XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPADX_CTL1(index));
 
-       if (port->supply && port->mode == USB_DR_MODE_HOST) {
-               err = regulator_enable(port->supply);
-               if (err)
-                       return err;
-       }
-
-       mutex_lock(&padctl->lock);
-
        if (pad->enable > 0) {
                pad->enable++;
                mutex_unlock(&padctl->lock);
@@ -2062,7 +2092,7 @@ static int tegra210_usb2_phy_power_on(struct phy *phy)
 
        err = clk_prepare_enable(pad->clk);
        if (err)
-               goto disable_regulator;
+               goto out;
 
        value = padctl_readl(padctl, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
        value &= ~((XUSB_PADCTL_USB2_BIAS_PAD_CTL1_TRK_START_TIMER_MASK <<
@@ -2094,8 +2124,7 @@ static int tegra210_usb2_phy_power_on(struct phy *phy)
 
        return 0;
 
-disable_regulator:
-       regulator_disable(port->supply);
+out:
        mutex_unlock(&padctl->lock);
        return err;
 }
@@ -2154,7 +2183,6 @@ static int tegra210_usb2_phy_power_off(struct phy *phy)
        padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL0);
 
 out:
-       regulator_disable(port->supply);
        mutex_unlock(&padctl->lock);
        return 0;
 }
-- 
2.25.1