diff options
| -rw-r--r-- | drivers/usb/chipidea/usbmisc_imx.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c index aa815f6d3fe9..7bfbfc83cfe3 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_imx6sx_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 + data->index * 4); + 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 const struct usbmisc_ops imx25_usbmisc_ops = { .init = usbmisc_imx25_init, .post = usbmisc_imx25_post, @@ -972,6 +991,7 @@ static const struct usbmisc_ops imx6sx_usbmisc_ops = { .init = usbmisc_imx6sx_init, .hsic_set_connect = usbmisc_imx6_hsic_set_connect, .hsic_set_clk = usbmisc_imx6_hsic_set_clk, + .power_lost_check = usbmisc_imx6sx_power_lost_check, }; static const struct usbmisc_ops imx7d_usbmisc_ops = { |