How to enable system clock from MCU M4

[vinothkumars]

Hi All,

I am working on IMX8QM-MEK with Android 9 Automotive. These are the observation I found with default Power Management behavior.

These are the observation

1, No interrupt triggered for Wake-up

mek_8q:/ $ cat /sys/power/pm_wakeup_irq
cat: /sys/power/pm_wakeup_irq: No data available 

2, Only timer expires concept is integrate

system/core/libsuspend/autosuspend.c

int autosuspend_force_suspend(int timeout_ms) {
    int ret;

    ret = autosuspend_init();
    if (ret) {
        return ret;
    }

    return autosuspend_ops->force_suspend(timeout_ms);
}

3, Deep sleep due to disable the following

source/vendor/nxp-opensource/kernel_imx/kernel/power

disable_nonboot_cpus

oom_killer_disable

arch_suspend_disable_irqs

4, Wake up is done due to enable the system clock and peripherals

source/vendor/nxp-opensource/kernel_imx/kernel/power

enable_nonboot_cpus

oom_killer_enable

arch_suspend_enable_irqs

I needs to implement enable clocks from m4 MCU.

Is there any per-defined API for enable clocks from M4 MCU ?

Thanks & Regards,

Vinoth S,

[vinothkumars]

Solution here,

IMX8QM-MEK Power Management difference between Linux and Android 

Regards,

VinothS.

[igorpadykov]

Hi Vinoth

opposite to previous i.MX products, for i.MX8(X) there is no CCM Chapter in

Reference Manual and no direct access to CCM registers (and PLLs) are allowed.

All access is performed using Linux SCFW APIs :

SCFW Porting Kit

Best regards
igor
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[vinothkumars]

Thank you Igor for the quick reply,

Thanks & Regards,

VinothS,