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authorLi Jun <jun.li@nxp.com>2022-10-13 23:14:41 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-10-23 14:34:53 +0200
commit604ceaa9e9fc223c2cc8d6cf0fc02022a3d14a68 (patch)
treed8f5088be9cc2d2f4ea1810e7bfec9b9ed3bb288 /drivers/usb/chipidea
parent04ff4d31af40e268c6cde78814be465a6412212d (diff)
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usb: chipidea: usbmisc: add power lost check for imx7d
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> Link: https://lore.kernel.org/r/20221013151442.3262951-8-xu.yang_2@nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/chipidea')
-rw-r--r--drivers/usb/chipidea/usbmisc_imx.c20
1 files changed, 20 insertions, 0 deletions
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 = {