Commit 04ff4d31 authored by Li Jun's avatar Li Jun Committed by Greg Kroah-Hartman
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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: default avatarLi Jun <jun.li@nxp.com>
Link: https://lore.kernel.org/r/20221013151442.3262951-7-xu.yang_2@nxp.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b332d6d5

drivers/usb/chipidea/usbmisc_imx.c

+20 −0
Original line number Diff line number Diff line
@@ -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 = {