diff mbox series

[7/8] usb: chipidea: usbmisc: add power lost check for imx7d

Message ID 20221009160813.776829-8-xu.yang_2@nxp.com
State Superseded
Headers show
Series [1/8] usb: chipidea: core: add controller resume support when controller is powered off | expand

Commit Message

Xu Yang Oct. 9, 2022, 4:08 p.m. UTC 
From: Li Jun <jun.li@nxp.com>

imx7d can shutdown domain power supply if none of peripheral in this
domain is registered as wakeup source, this patch add related codes to
check if power is lost.

Signed-off-by: Li Jun <jun.li@nxp.com>
---
 drivers/usb/chipidea/usbmisc_imx.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
diff mbox series

Patch

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 7bfbfc83cfe3..cc17dcd97856 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -939,6 +939,25 @@  static int usbmisc_imx7ulp_init(struct imx_usbmisc_data *data)
 	return 0;
 }
 
+static int usbmisc_imx7d_power_lost_check(struct imx_usbmisc_data *data)
+{
+	struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
+	unsigned long flags;
+	u32 val;
+
+	spin_lock_irqsave(&usbmisc->lock, flags);
+	val = readl(usbmisc->base);
+	spin_unlock_irqrestore(&usbmisc->lock, flags);
+	/*
+	 * Here use a power on reset value to judge
+	 * if the controller experienced a power lost
+	 */
+	if (val == 0x30001000)
+		return 1;
+	else
+		return 0;
+}
+
 static int usbmisc_imx6sx_power_lost_check(struct imx_usbmisc_data *data)
 {
 	struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
@@ -998,6 +1017,7 @@  static const struct usbmisc_ops imx7d_usbmisc_ops = {
 	.init = usbmisc_imx7d_init,
 	.set_wakeup = usbmisc_imx7d_set_wakeup,
 	.charger_detection = imx7d_charger_detection,
+	.power_lost_check = usbmisc_imx7d_power_lost_check,
 };
 
 static const struct usbmisc_ops imx7ulp_usbmisc_ops = {