[PATCH 1/1] usb: cdns3: add power lost support for system resume
From: Frank Li <Frank.Li@nxp.com>
Date: 2021-02-02 17:03:17
If the controller lost its power during the system suspend, we need to do all initialiation operations. Signed-off-by: Peter Chen <redacted> Signed-off-by: Frank Li <Frank.Li@nxp.com> --- drivers/usb/cdns3/cdns3-gadget.c | 2 ++ drivers/usb/cdns3/cdns3-imx.c | 34 ++++++++++++++++++++++++++++++++ drivers/usb/cdns3/cdns3-plat.c | 22 ++++++++++++++++++++- drivers/usb/cdns3/core.c | 29 ++++++++++++++++++++++++++- drivers/usb/cdns3/drd.c | 16 +++++++++++++++ drivers/usb/cdns3/drd.h | 2 +- 6 files changed, 102 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
index 582bfeceedb4..44b7301b1888 100644
--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c@@ -3304,6 +3304,8 @@ static int cdns3_gadget_resume(struct cdns *cdns, bool hibernated) return 0; cdns3_gadget_config(priv_dev); + if (hibernated) + writel(USB_CONF_DEVEN, &priv_dev->regs->usb_conf); return 0; }
diff --git a/drivers/usb/cdns3/cdns3-imx.c b/drivers/usb/cdns3/cdns3-imx.c
index 8f88eec0b0ea..708b51cc5844 100644
--- a/drivers/usb/cdns3/cdns3-imx.c
+++ b/drivers/usb/cdns3/cdns3-imx.c@@ -361,6 +361,39 @@ static int cdns_imx_suspend(struct device *dev) return 0; } + + +/* Indicate if the controller was power lost before */ +static inline bool cdns_imx_is_power_lost(struct cdns_imx *data) +{ + u32 value; + + value = cdns_imx_readl(data, USB3_CORE_CTRL1); + if ((value & SW_RESET_MASK) == ALL_SW_RESET) + return true; + else + return false; +} + +static int cdns_imx_system_resume(struct device *dev) +{ + struct cdns_imx *data = dev_get_drvdata(dev); + int ret; + + ret = cdns_imx_resume(dev); + if (ret) + return ret; + + if (cdns_imx_is_power_lost(data)) { + dev_dbg(dev, "resume from power lost\n"); + ret = cdns_imx_noncore_init(data); + if (ret) + cdns_imx_suspend(dev); + } + + return ret; +} + #else static int cdns_imx_platform_suspend(struct device *dev, bool suspend, bool wakeup)
@@ -372,6 +405,7 @@ static int cdns_imx_platform_suspend(struct device *dev, static const struct dev_pm_ops cdns_imx_pm_ops = { SET_RUNTIME_PM_OPS(cdns_imx_suspend, cdns_imx_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(cdns_imx_suspend, cdns_imx_system_resume) }; static const struct of_device_id cdns_imx_of_match[] = {
diff --git a/drivers/usb/cdns3/cdns3-plat.c b/drivers/usb/cdns3/cdns3-plat.c
index 4b18e1c6a4bb..e61da57fe31a 100644
--- a/drivers/usb/cdns3/cdns3-plat.c
+++ b/drivers/usb/cdns3/cdns3-plat.c@@ -19,6 +19,7 @@ #include "core.h" #include "gadget-export.h" +#include "drd.h" static int set_phy_power_on(struct cdns *cdns) {
@@ -236,6 +237,17 @@ static int cdns3_controller_resume(struct device *dev, pm_message_t msg) if (!cdns->in_lpm) return 0; + if (cdns_power_is_lost(cdns)) { + phy_exit(cdns->usb2_phy); + ret = phy_init(cdns->usb2_phy); + if (ret) + return ret; + phy_exit(cdns->usb3_phy); + ret = phy_init(cdns->usb3_phy); + if (ret) + return ret; + } + ret = set_phy_power_on(cdns); if (ret) return ret;
@@ -270,10 +282,18 @@ static int cdns3_plat_runtime_resume(struct device *dev) static int cdns3_plat_suspend(struct device *dev) { struct cdns *cdns = dev_get_drvdata(dev); + int ret; cdns_suspend(cdns); - return cdns3_controller_suspend(dev, PMSG_SUSPEND); + ret = cdns3_controller_suspend(dev, PMSG_SUSPEND); + if (ret) + return ret; + + if (device_may_wakeup(dev) && cdns->wakeup_irq) + enable_irq_wake(cdns->wakeup_irq); + + return ret; } static int cdns3_plat_resume(struct device *dev)
diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
index 199713769289..5d486c8a9d99 100644
--- a/drivers/usb/cdns3/core.c
+++ b/drivers/usb/cdns3/core.c@@ -525,9 +525,36 @@ EXPORT_SYMBOL_GPL(cdns_suspend); int cdns_resume(struct cdns *cdns, u8 set_active) { struct device *dev = cdns->dev; + enum usb_role real_role; + bool role_changed = false; + int ret; + + if (cdns_power_is_lost(cdns)) { + if (cdns->role_sw) { + cdns->role = cdns_role_get(cdns->role_sw); + } else { + real_role = cdns_hw_role_state_machine(cdns); + if (real_role != cdns->role) { + ret = cdns_hw_role_switch(cdns); + if (ret) + return ret; + role_changed = true; + } + } + + if (!role_changed) { + if (cdns->role == USB_ROLE_HOST) + ret = cdns_drd_host_on(cdns); + else if (cdns->role == USB_ROLE_DEVICE) + ret = cdns_drd_gadget_on(cdns); + + if (ret) + return ret; + } + } if (cdns->roles[cdns->role]->resume) - cdns->roles[cdns->role]->resume(cdns, false); + cdns->roles[cdns->role]->resume(cdns, cdns_power_is_lost(cdns)); if (set_active) { pm_runtime_disable(dev);
diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c
index 605a413db727..8b04e030df4d 100644
--- a/drivers/usb/cdns3/drd.c
+++ b/drivers/usb/cdns3/drd.c@@ -478,3 +478,19 @@ int cdns_drd_exit(struct cdns *cdns) return 0; } + + +/* Indicate the cdns3 core was power lost before */ +bool cdns_power_is_lost(struct cdns *cdns) +{ + int ret = false; + + if (cdns->version == CDNS3_CONTROLLER_V1) { + if (!(readl(&cdns->otg_v1_regs->simulate) & BIT(0))) + ret = true; + } else { + if (!(readl(&cdns->otg_v0_regs->simulate) & BIT(0))) + ret = true; + } + return ret; +}
diff --git a/drivers/usb/cdns3/drd.h b/drivers/usb/cdns3/drd.h
index 9724acdecbbb..cbdf94f73ed9 100644
--- a/drivers/usb/cdns3/drd.h
+++ b/drivers/usb/cdns3/drd.h@@ -215,5 +215,5 @@ int cdns_drd_gadget_on(struct cdns *cdns); void cdns_drd_gadget_off(struct cdns *cdns); int cdns_drd_host_on(struct cdns *cdns); void cdns_drd_host_off(struct cdns *cdns); - +bool cdns_power_is_lost(struct cdns *cdns); #endif /* __LINUX_CDNS3_DRD */
--
2.24.0.rc1
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