Commit c545a905 authored by JC Kuo's avatar JC Kuo Committed by Thierry Reding
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phy: tegra: xusb: Add sleepwalk and suspend/resume 



This commit adds sleepwalk/wake and suspend/resume interfaces
to Tegra XUSB PHY driver.

Tegra XUSB host controller driver makes use of sleepwalk functions
to enable/disable sleepwalk circuit which is in always-on partition
and can respond to USB resume signals when controller is not powered.
Sleepwalk can be enabled/disabled for any USB UPHY individually.

  - tegra_xusb_padctl_enable_phy_sleepwalk()
  - tegra_xusb_padctl_disable_phy_sleepwalk()

Tegra XUSB host controller driver makes use of wake functions to
enable/disable/query wake circuit which is in always-on partition
can wake system up when USB resume happens.
Wake circuit can be enabled/disabled for any USB PHY individually.

  - tegra_xusb_padctl_enable_phy_wake()
  - tegra_xusb_padctl_disable_phy_wake()
  - tegra_xusb_padctl_remote_wake_detected()

This commit also adds two system suspend stubs that can be used to
save and restore XUSB PADCTL context during system suspend and
resume.
  - tegra_xusb_padctl_suspend_noirq()
  - tegra_xusb_padctl_resume_noirq()

Signed-off-by: default avatarJC Kuo <jckuo@nvidia.com>
Acked-By: default avatarVinod Koul <vkoul@kernel.org>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent c339605c

drivers/phy/tegra/xusb.c

+82 −0
Original line number Diff line number Diff line
@@ -1273,10 +1273,36 @@ static int tegra_xusb_padctl_remove(struct platform_device *pdev) 
	return err;

}



static int tegra_xusb_padctl_suspend_noirq(struct device *dev)

{

	struct tegra_xusb_padctl *padctl = dev_get_drvdata(dev);



	if (padctl->soc && padctl->soc->ops && padctl->soc->ops->suspend_noirq)

		return padctl->soc->ops->suspend_noirq(padctl);



	return 0;

}



static int tegra_xusb_padctl_resume_noirq(struct device *dev)

{

	struct tegra_xusb_padctl *padctl = dev_get_drvdata(dev);



	if (padctl->soc && padctl->soc->ops && padctl->soc->ops->resume_noirq)

		return padctl->soc->ops->resume_noirq(padctl);



	return 0;

}



static const struct dev_pm_ops tegra_xusb_padctl_pm_ops = {

	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_xusb_padctl_suspend_noirq,

				      tegra_xusb_padctl_resume_noirq)

};



static struct platform_driver tegra_xusb_padctl_driver = {

	.driver = {

		.name = "tegra-xusb-padctl",

		.of_match_table = tegra_xusb_padctl_of_match,

		.pm = &tegra_xusb_padctl_pm_ops,

	},

	.probe = tegra_xusb_padctl_probe,

	.remove = tegra_xusb_padctl_remove,
@@ -1343,6 +1369,62 @@ int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl, 
}

EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle);



int tegra_xusb_padctl_enable_phy_sleepwalk(struct tegra_xusb_padctl *padctl, struct phy *phy,

					   enum usb_device_speed speed)

{

	struct tegra_xusb_lane *lane = phy_get_drvdata(phy);



	if (lane->pad->ops->enable_phy_sleepwalk)

		return lane->pad->ops->enable_phy_sleepwalk(lane, speed);



	return -EOPNOTSUPP;

}

EXPORT_SYMBOL_GPL(tegra_xusb_padctl_enable_phy_sleepwalk);



int tegra_xusb_padctl_disable_phy_sleepwalk(struct tegra_xusb_padctl *padctl, struct phy *phy)

{

	struct tegra_xusb_lane *lane = phy_get_drvdata(phy);



	if (lane->pad->ops->disable_phy_sleepwalk)

		return lane->pad->ops->disable_phy_sleepwalk(lane);



	return -EOPNOTSUPP;

}

EXPORT_SYMBOL_GPL(tegra_xusb_padctl_disable_phy_sleepwalk);



int tegra_xusb_padctl_enable_phy_wake(struct tegra_xusb_padctl *padctl, struct phy *phy)

{

	struct tegra_xusb_lane *lane = phy_get_drvdata(phy);



	if (lane->pad->ops->enable_phy_wake)

		return lane->pad->ops->enable_phy_wake(lane);



	return -EOPNOTSUPP;

}

EXPORT_SYMBOL_GPL(tegra_xusb_padctl_enable_phy_wake);



int tegra_xusb_padctl_disable_phy_wake(struct tegra_xusb_padctl *padctl, struct phy *phy)

{

	struct tegra_xusb_lane *lane = phy_get_drvdata(phy);



	if (lane->pad->ops->disable_phy_wake)

		return lane->pad->ops->disable_phy_wake(lane);



	return -EOPNOTSUPP;

}

EXPORT_SYMBOL_GPL(tegra_xusb_padctl_disable_phy_wake);



bool tegra_xusb_padctl_remote_wake_detected(struct tegra_xusb_padctl *padctl, struct phy *phy)

{

	struct tegra_xusb_lane *lane = phy_get_drvdata(phy);



	if (lane->pad->ops->remote_wake_detected)

		return lane->pad->ops->remote_wake_detected(lane);



	return false;

}

EXPORT_SYMBOL_GPL(tegra_xusb_padctl_remote_wake_detected);



int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,

					   unsigned int port, bool enable)

{

drivers/phy/tegra/xusb.h

+8 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <linux/mutex.h>

#include <linux/workqueue.h>



#include <linux/usb/ch9.h>

#include <linux/usb/otg.h>

#include <linux/usb/role.h>
@@ -132,6 +133,11 @@ struct tegra_xusb_lane_ops { 
	void (*remove)(struct tegra_xusb_lane *lane);

	void (*iddq_enable)(struct tegra_xusb_lane *lane);

	void (*iddq_disable)(struct tegra_xusb_lane *lane);

	int (*enable_phy_sleepwalk)(struct tegra_xusb_lane *lane, enum usb_device_speed speed);

	int (*disable_phy_sleepwalk)(struct tegra_xusb_lane *lane);

	int (*enable_phy_wake)(struct tegra_xusb_lane *lane);

	int (*disable_phy_wake)(struct tegra_xusb_lane *lane);

	bool (*remote_wake_detected)(struct tegra_xusb_lane *lane);

};



bool tegra_xusb_lane_check(struct tegra_xusb_lane *lane, const char *function);
@@ -396,6 +402,8 @@ struct tegra_xusb_padctl_ops { 
			 const struct tegra_xusb_padctl_soc *soc);

	void (*remove)(struct tegra_xusb_padctl *padctl);



	int (*suspend_noirq)(struct tegra_xusb_padctl *padctl);

	int (*resume_noirq)(struct tegra_xusb_padctl *padctl);

	int (*usb3_save_context)(struct tegra_xusb_padctl *padctl,

				 unsigned int index);

	int (*hsic_set_idle)(struct tegra_xusb_padctl *padctl,

include/linux/phy/tegra/xusb.h

+9 −1
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-only */

/*

 * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.

 * Copyright (c) 2016-2020, NVIDIA CORPORATION.  All rights reserved.

 */



#ifndef PHY_TEGRA_XUSB_H
@@ -8,6 +8,7 @@ 


struct tegra_xusb_padctl;

struct device;

enum usb_device_speed;



struct tegra_xusb_padctl *tegra_xusb_padctl_get(struct device *dev);

void tegra_xusb_padctl_put(struct tegra_xusb_padctl *padctl);
@@ -23,4 +24,11 @@ int tegra_xusb_padctl_set_vbus_override(struct tegra_xusb_padctl *padctl, 
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);

int tegra_xusb_padctl_enable_phy_sleepwalk(struct tegra_xusb_padctl *padctl, struct phy *phy,

					   enum usb_device_speed speed);

int tegra_xusb_padctl_disable_phy_sleepwalk(struct tegra_xusb_padctl *padctl, struct phy *phy);

int tegra_xusb_padctl_enable_phy_wake(struct tegra_xusb_padctl *padctl, struct phy *phy);

int tegra_xusb_padctl_disable_phy_wake(struct tegra_xusb_padctl *padctl, struct phy *phy);

bool tegra_xusb_padctl_remote_wake_detected(struct tegra_xusb_padctl *padctl, struct phy *phy);



#endif /* PHY_TEGRA_XUSB_H */