Cannot wake up from freeze with GPIO

[geraldheinig]

Hello,

I have an i.MX6 custom board that is very similar to the Sabre SD running Yocto Linux 4.1.15.

Determining the available power settings for my board gives the following:

# cat /sys/power/state

freeze standby mem

#

I have created a device tree entry for the gpio-keys driver to wake my board up from a GPIO pin:

Pinctrl entry:

pinctrl_gpio_keys: gpio_keysgrp {

                fsl,pins = <

                                MX6QDL_PAD_GPIO_2__GPIO1_IO02                  0x1b0b0 // Alert Button

                >;

};

// Enable wakeup from sleep via emergency button

gpio-keys {

                compatible = "gpio-keys";

                pinctrl-names = "default";

                pinctrl-0 = <&pinctrl_gpio_keys>;

                power {

                                label = "Alert-Button";

                                gpios = <&gpio1 2 IRQ_TYPE_EDGE_RISING>;

                                interrupts = <66 IRQ_TYPE_LEVEL_HIGH 7>;

                                linux,code = <118>; /* KEY_CTRL_LEFT */

                                gpio-key,wakeup;

                };

};

This works fine for the sleep modes entered using 'mem' and 'standby', ie.

# echo mem > /sys/power/state

and

# echo standby > /sys/power/state

I can wake the system up successfully with my GPIO button from these 2 states.

However, this does not work with the 'freeze' mode:

# echo freeze > /sys/power/state

// cannot wake up, need to reset board

Can anyone explain why the freeze mode doesn't work, but the others do?

[vinothkumars]

Hi Gerald Heinig,

Will you please give your configuration. I am also struggling in wake up.

Thanks & Regards,

VinothS,

[geraldheinig]

Hello Vinothkumar,

I'm afraid I no longer have access to the code; the project was completed three years ago. I'm sorry I can't help.

Regards,

Gerald

[vinothkumars]

Thank you Gerald Heinig for the reply.

Currently, I am working on IMX8QM with Android Automotive  - Power Management.

Just I need some info. Actually, I am trying with most of the functionality.

Regards,

VinothS,

[Carlos_Musich]

Hi Gerald,

neither in the Linux Reference Manual or the PMIC Reference Manual is documented a freeze mode. So I dont think it is implemented.

Where did you find a reference to freeze mode?

Regards,
Carlos

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