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phy: tegra: xusb: Add sleepwalk and suspend/resume
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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: JC Kuo <jckuo@nvidia.com>
Acked-By: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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JC Kuo authored and Thierry Reding committed Jun 3, 2021
1 parent c339605 commit c545a90
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Showing 3 changed files with 99 additions and 1 deletion.
82 changes: 82 additions & 0 deletions drivers/phy/tegra/xusb.c
Original file line number Diff line number Diff line change
Expand Up @@ -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,
Expand Down Expand Up @@ -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)
{
Expand Down
8 changes: 8 additions & 0 deletions drivers/phy/tegra/xusb.h
Original file line number Diff line number Diff line change
Expand Up @@ -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>

Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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,
Expand Down
10 changes: 9 additions & 1 deletion include/linux/phy/tegra/xusb.h
Original file line number Diff line number Diff line change
@@ -1,13 +1,14 @@
/* 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
#define PHY_TEGRA_XUSB_H

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);
Expand All @@ -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 */

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