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usb: chipidea: usbmisc: add power lost check for imx6sx 

imx6sx mega off 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/20221013151442.3262951-7-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Li Jun 2022-10-13 23:14:40 +08:00 committed by Greg Kroah-Hartman
parent b332d6d5c8
commit 04ff4d31af
1 changed files with 20 additions and 0 deletions
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20
drivers/usb/chipidea/usbmisc_imx.c
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@ -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 = {