From: Li Jun Date: Thu, 13 Oct 2022 15:14:41 +0000 (+0800) Subject: usb: chipidea: usbmisc: add power lost check for imx7d X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=604ceaa9e9fc223c2cc8d6cf0fc02022a3d14a68;p=linux.git 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 Link: https://lore.kernel.org/r/20221013151442.3262951-8-xu.yang_2@nxp.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c index 7bfbfc83cfe3c..cc17dcd97856c 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 = {