[PATCH 0/2] usb: tegra: power down UTMI pad

[PATCH 0/2] usb: tegra: power down UTMI pad

[Jim Lin]

1. Make functions to be generic and public for tegra host/gadget driver 
 to power on/down UTMI pad
2. For tegra gadget driver to power down pad after disconnected

Jim Lin (2):
  phy: tegra: xusb: add utmi pad power on/down ops
  usb: gadget: tegra: Reduce pad power

 drivers/phy/tegra/xusb-tegra186.c   | 19 ++++++++++++-------
 drivers/phy/tegra/xusb.c            | 22 +++++++++++++++++++++-
 drivers/phy/tegra/xusb.h            |  4 +++-
 drivers/usb/gadget/udc/tegra-xudc.c |  4 ++++
 include/linux/phy/tegra/xusb.h      |  2 ++
 5 files changed, 42 insertions(+), 9 deletions(-)

-- 
2.17.1

[PATCH 1/2] phy: tegra: xusb: add utmi pad power on/down ops

[Jim Lin]

Add utmi_pad_power_on/down ops for each SOC instead of exporting
tegra_phy_xusb_utmi_pad_power_on/down directly for Tegra186 chip.

Signed-off-by: BH Hsieh <bhsieh@nvidia.com>
Signed-off-by: Jim Lin <jilin@nvidia.com>
---
 drivers/phy/tegra/xusb-tegra186.c | 19 ++++++++++++-------
 drivers/phy/tegra/xusb.c          | 22 +++++++++++++++++++++-
 drivers/phy/tegra/xusb.h          |  4 +++-
 include/linux/phy/tegra/xusb.h    |  2 ++
 4 files changed, 38 insertions(+), 9 deletions(-)

diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
index ae3915ed9fef..5abdf81aa143 100644
--- a/drivers/phy/tegra/xusb-tegra186.c
+++ b/drivers/phy/tegra/xusb-tegra186.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (c) 2016-2020, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2016-2022, NVIDIA CORPORATION.  All rights reserved.
  */
 
 #include <linux/delay.h>
@@ -638,7 +638,7 @@ static void tegra186_utmi_bias_pad_power_off(struct tegra_xusb_padctl *padctl)
 	mutex_unlock(&padctl->lock);
 }
 
-static void tegra_phy_xusb_utmi_pad_power_on(struct phy *phy)
+static void tegra186_utmi_pad_power_on(struct phy *phy)
 {
 	struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
 	struct tegra_xusb_padctl *padctl = lane->pad->padctl;
@@ -656,6 +656,8 @@ static void tegra_phy_xusb_utmi_pad_power_on(struct phy *phy)
 		return;
 	}
 
+	dev_dbg(dev, "power on UTMI pad %u\n", index);
+
 	tegra186_utmi_bias_pad_power_on(padctl);
 
 	udelay(2);
@@ -669,7 +671,7 @@ static void tegra_phy_xusb_utmi_pad_power_on(struct phy *phy)
 	padctl_writel(padctl, value, XUSB_PADCTL_USB2_OTG_PADX_CTL1(index));
 }
 
-static void tegra_phy_xusb_utmi_pad_power_down(struct phy *phy)
+static void tegra186_utmi_pad_power_down(struct phy *phy)
 {
 	struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
 	struct tegra_xusb_padctl *padctl = lane->pad->padctl;
@@ -679,6 +681,8 @@ static void tegra_phy_xusb_utmi_pad_power_down(struct phy *phy)
 	if (!phy)
 		return;
 
+	dev_dbg(padctl->dev, "power down UTMI pad %u\n", index);
+
 	value = padctl_readl(padctl, XUSB_PADCTL_USB2_OTG_PADX_CTL0(index));
 	value |= USB2_OTG_PD;
 	padctl_writel(padctl, value, XUSB_PADCTL_USB2_OTG_PADX_CTL0(index));
@@ -849,15 +853,14 @@ static int tegra186_utmi_phy_power_on(struct phy *phy)
 	value |= RPD_CTRL(priv->calib.rpd_ctrl);
 	padctl_writel(padctl, value, XUSB_PADCTL_USB2_OTG_PADX_CTL1(index));
 
-	/* TODO: pad power saving */
-	tegra_phy_xusb_utmi_pad_power_on(phy);
+	tegra186_utmi_pad_power_on(phy);
+
 	return 0;
 }
 
 static int tegra186_utmi_phy_power_off(struct phy *phy)
 {
-	/* TODO: pad power saving */
-	tegra_phy_xusb_utmi_pad_power_down(phy);
+	tegra186_utmi_pad_power_down(phy);
 
 	return 0;
 }
@@ -1486,6 +1489,8 @@ static const struct tegra_xusb_padctl_ops tegra186_xusb_padctl_ops = {
 	.suspend_noirq = tegra186_xusb_padctl_suspend_noirq,
 	.resume_noirq = tegra186_xusb_padctl_resume_noirq,
 	.vbus_override = tegra186_xusb_padctl_vbus_override,
+	.utmi_pad_power_on = tegra186_utmi_pad_power_on,
+	.utmi_pad_power_down = tegra186_utmi_pad_power_down,
 };
 
 #if IS_ENABLED(CONFIG_ARCH_TEGRA_186_SOC)
diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 963de5913e50..49873718d54a 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2014-2020, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2014-2022, NVIDIA CORPORATION.  All rights reserved.
  */
 
 #include <linux/delay.h>
@@ -1458,6 +1458,26 @@ int tegra_phy_xusb_utmi_port_reset(struct phy *phy)
 }
 EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_port_reset);
 
+void tegra_phy_xusb_utmi_pad_power_on(struct phy *phy)
+{
+	struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
+	struct tegra_xusb_padctl *padctl = lane->pad->padctl;
+
+	if (padctl->soc->ops->utmi_pad_power_on)
+		padctl->soc->ops->utmi_pad_power_on(phy);
+}
+EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_pad_power_on);
+
+void tegra_phy_xusb_utmi_pad_power_down(struct phy *phy)
+{
+	struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
+	struct tegra_xusb_padctl *padctl = lane->pad->padctl;
+
+	if (padctl->soc->ops->utmi_pad_power_down)
+		padctl->soc->ops->utmi_pad_power_down(phy);
+}
+EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_pad_power_down);
+
 int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl,
 				    unsigned int port)
 {
diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
index 034f7a2c28d6..8cfbbdbd6e0c 100644
--- a/drivers/phy/tegra/xusb.h
+++ b/drivers/phy/tegra/xusb.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (c) 2014-2020, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2014-2022, NVIDIA CORPORATION.  All rights reserved.
  * Copyright (c) 2015, Google Inc.
  */
 
@@ -412,6 +412,8 @@ struct tegra_xusb_padctl_ops {
 				    unsigned int index, bool enable);
 	int (*vbus_override)(struct tegra_xusb_padctl *padctl, bool set);
 	int (*utmi_port_reset)(struct phy *phy);
+	void (*utmi_pad_power_on)(struct phy *phy);
+	void (*utmi_pad_power_down)(struct phy *phy);
 };
 
 struct tegra_xusb_padctl_soc {
diff --git a/include/linux/phy/tegra/xusb.h b/include/linux/phy/tegra/xusb.h
index 3a35e74cdc61..beced277f40a 100644
--- a/include/linux/phy/tegra/xusb.h
+++ b/include/linux/phy/tegra/xusb.h
@@ -21,6 +21,8 @@ int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
 					   unsigned int port, bool enable);
 int tegra_xusb_padctl_set_vbus_override(struct tegra_xusb_padctl *padctl,
 					bool val);
+void tegra_phy_xusb_utmi_pad_power_on(struct phy *phy);
+void tegra_phy_xusb_utmi_pad_power_down(struct phy *phy);
 int tegra_phy_xusb_utmi_port_reset(struct phy *phy);
 int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl,
 					 unsigned int port);
-- 
2.17.1

[PATCH 2/2] usb: gadget: tegra: Reduce pad power

[Jim Lin]

Program USB2 UTMI pad PD controls during port connect/disconnect.
Power down pad after disconnected to save power.

Signed-off-by: Jim Lin <jilin@nvidia.com>
---
 drivers/usb/gadget/udc/tegra-xudc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
index 43f1b0d461c1..f03bed263922 100644
--- a/drivers/usb/gadget/udc/tegra-xudc.c
+++ b/drivers/usb/gadget/udc/tegra-xudc.c
@@ -703,6 +703,8 @@ static void tegra_xudc_device_mode_on(struct tegra_xudc *xudc)
 
 	pm_runtime_get_sync(xudc->dev);
 
+	tegra_phy_xusb_utmi_pad_power_on(xudc->curr_utmi_phy);
+
 	err = phy_power_on(xudc->curr_utmi_phy);
 	if (err < 0)
 		dev_err(xudc->dev, "UTMI power on failed: %d\n", err);
@@ -757,6 +759,8 @@ static void tegra_xudc_device_mode_off(struct tegra_xudc *xudc)
 	/* Make sure interrupt handler has completed before powergating. */
 	synchronize_irq(xudc->irq);
 
+	tegra_phy_xusb_utmi_pad_power_down(xudc->curr_utmi_phy);
+
 	err = phy_power_off(xudc->curr_utmi_phy);
 	if (err < 0)
 		dev_err(xudc->dev, "UTMI PHY power off failed: %d\n", err);
-- 
2.17.1