From 84364a00b264885a97f83c328df8e63d3ec7aefa Mon Sep 17 00:00:00 2001 From: Aswath Govindraju Date: Thu, 16 Mar 2023 15:12:24 +0200 Subject: [PATCH] usb: dwc3-am62: Add support for system wakeup based on USB events The USB2SS IP in TI's AM62 SoC is capable of supporting wakeup from deep sleep based on the following events, 1) VBUS state change 2) Overcurrent detection 3) Line state change Wakeup from these events can enabled by setting their corresponding bits in the WAKEUP_CONFIG register. The events to be enabled are decided based on the current role of the controller. When the role of the controller is host, the comparators for detecting VBUS state change are disabled while entering low power mode. This is done as VBUS state is not used in host mode and disabling the comparators helps in reducing the power consumption. So, wakeup from VBUS state change should be disabled in host mode. While operating in peripheral mode all the wakeup events can be enabled. Therefore, add support for the same in the suspend/resume hooks. Signed-off-by: Aswath Govindraju Signed-off-by: Roger Quadros Acked-by: Thinh Nguyen Link: https://lore.kernel.org/r/20230316131226.89540-2-rogerq@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc3/dwc3-am62.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c index 173cf35..867bfa1 100644 --- a/drivers/usb/dwc3/dwc3-am62.c +++ b/drivers/usb/dwc3/dwc3-am62.c @@ -17,6 +17,8 @@ #include #include +#include "core.h" + /* USB WRAPPER register offsets */ #define USBSS_PID 0x0 #define USBSS_OVERCURRENT_CTRL 0x4 @@ -45,6 +47,10 @@ #define USBSS_PHY_VBUS_SEL_SHIFT 1 #define USBSS_PHY_LANE_REVERSE BIT(0) +/* CORE STAT register bits */ +#define USBSS_CORE_OPERATIONAL_MODE_MASK GENMASK(13, 12) +#define USBSS_CORE_OPERATIONAL_MODE_SHIFT 12 + /* MODE CONTROL register bits */ #define USBSS_MODE_VALID BIT(0) @@ -233,6 +239,9 @@ static int dwc3_ti_probe(struct platform_device *pdev) reg |= USBSS_MODE_VALID; dwc3_ti_writel(data, USBSS_MODE_CONTROL, reg); + /* Device has capability to wakeup system from sleep */ + device_set_wakeup_capable(dev, true); + /* Setting up autosuspend */ pm_runtime_set_autosuspend_delay(dev, DWC3_AM62_AUTOSUSPEND_DELAY); pm_runtime_use_autosuspend(dev); @@ -281,6 +290,22 @@ static int dwc3_ti_remove(struct platform_device *pdev) static int dwc3_ti_suspend_common(struct device *dev) { struct dwc3_data *data = dev_get_drvdata(dev); + u32 reg, current_prtcap_dir; + + if (device_may_wakeup(dev)) { + reg = dwc3_ti_readl(data, USBSS_CORE_STAT); + current_prtcap_dir = (reg & USBSS_CORE_OPERATIONAL_MODE_MASK) + >> USBSS_CORE_OPERATIONAL_MODE_SHIFT; + /* Set wakeup config enable bits */ + reg = dwc3_ti_readl(data, USBSS_WAKEUP_CONFIG); + if (current_prtcap_dir == DWC3_GCTL_PRTCAP_HOST) { + reg |= USBSS_WAKEUP_CFG_LINESTATE_EN | USBSS_WAKEUP_CFG_OVERCURRENT_EN; + } else { + reg |= USBSS_WAKEUP_CFG_OVERCURRENT_EN | USBSS_WAKEUP_CFG_LINESTATE_EN | + USBSS_WAKEUP_CFG_VBUSVALID_EN; + } + dwc3_ti_writel(data, USBSS_WAKEUP_CONFIG, reg); + } clk_disable_unprepare(data->usb2_refclk); @@ -290,9 +315,23 @@ static int dwc3_ti_suspend_common(struct device *dev) static int dwc3_ti_resume_common(struct device *dev) { struct dwc3_data *data = dev_get_drvdata(dev); + u32 reg; clk_prepare_enable(data->usb2_refclk); + if (device_may_wakeup(dev)) { + /* Clear wakeup config enable bits */ + reg = dwc3_ti_readl(data, USBSS_WAKEUP_CONFIG); + reg &= ~(USBSS_WAKEUP_CFG_OVERCURRENT_EN | USBSS_WAKEUP_CFG_LINESTATE_EN | + USBSS_WAKEUP_CFG_VBUSVALID_EN); + dwc3_ti_writel(data, USBSS_WAKEUP_CONFIG, reg); + } + + reg = dwc3_ti_readl(data, USBSS_WAKEUP_STAT); + /* Clear the wakeup status with wakeup clear bit */ + reg |= USBSS_WAKEUP_STAT_CLR; + dwc3_ti_writel(data, USBSS_WAKEUP_STAT, reg); + return 0; } -- 2.7.4