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    Subject[PATCH v3 07/15] phy: tegra: xusb: Add sleepwalk and suspend/resume
    Date
    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>
    ---
    v3:
    commit message improvement, no change in code

    drivers/phy/tegra/xusb.c | 73 ++++++++++++++++++++++++++++++++++
    drivers/phy/tegra/xusb.h | 9 +++++
    include/linux/phy/tegra/xusb.h | 8 ++++
    3 files changed, 90 insertions(+)

    diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
    index b92478a350df..bc700e6a5519 100644
    --- a/drivers/phy/tegra/xusb.c
    +++ b/drivers/phy/tegra/xusb.c
    @@ -1274,10 +1274,36 @@ 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,
    @@ -1344,6 +1370,53 @@ 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)
    +{
    + if (padctl->soc->ops->enable_phy_sleepwalk)
    + return padctl->soc->ops->enable_phy_sleepwalk(padctl, phy,
    + speed);
    +
    + return -ENOTSUPP;
    +}
    +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_enable_phy_sleepwalk);
    +
    +int tegra_xusb_padctl_disable_phy_sleepwalk(struct tegra_xusb_padctl *padctl, struct phy *phy)
    +{
    + if (padctl->soc->ops->disable_phy_sleepwalk)
    + return padctl->soc->ops->disable_phy_sleepwalk(padctl, phy);
    +
    + return -ENOTSUPP;
    +}
    +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_disable_phy_sleepwalk);
    +
    +int tegra_xusb_padctl_enable_phy_wake(struct tegra_xusb_padctl *padctl, struct phy *phy)
    +{
    + if (padctl->soc->ops->enable_phy_wake)
    + return padctl->soc->ops->enable_phy_wake(padctl, phy);
    +
    + return -ENOTSUPP;
    +}
    +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_enable_phy_wake);
    +
    +int tegra_xusb_padctl_disable_phy_wake(struct tegra_xusb_padctl *padctl, struct phy *phy)
    +{
    + if (padctl->soc->ops->disable_phy_wake)
    + return padctl->soc->ops->disable_phy_wake(padctl, phy);
    +
    + return -ENOTSUPP;
    +}
    +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_disable_phy_wake);
    +
    +bool tegra_xusb_padctl_remote_wake_detected(struct tegra_xusb_padctl *padctl, struct phy *phy)
    +{
    + if (padctl->soc->ops->remote_wake_detected)
    + return padctl->soc->ops->remote_wake_detected(phy);
    +
    + 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)
    {
    diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
    index 9463bc74729e..c796344e3062 100644
    --- a/drivers/phy/tegra/xusb.h
    +++ b/drivers/phy/tegra/xusb.h
    @@ -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>

    @@ -396,6 +397,8 @@ 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,
    @@ -404,6 +407,12 @@ 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);
    + int (*enable_phy_sleepwalk)(struct tegra_xusb_padctl *padctl, struct phy *phy,
    + enum usb_device_speed speed);
    + int (*disable_phy_sleepwalk)(struct tegra_xusb_padctl *padctl, struct phy *phy);
    + int (*enable_phy_wake)(struct tegra_xusb_padctl *padctl, struct phy *phy);
    + int (*disable_phy_wake)(struct tegra_xusb_padctl *padctl, struct phy *phy);
    + bool (*remote_wake_detected)(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 71d956935405..f24d4744db17 100644
    --- a/include/linux/phy/tegra/xusb.h
    +++ b/include/linux/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 */
    --
    2.25.1
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