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Problem with reducing power consumption at i.MX6q

Question asked by Ivan Nikolaenko on Jul 26, 2016
Latest reply on Jul 27, 2016 by Yuri Muhin

Hi all!

 

I am trying to implement steps (5.1.4 of https://cache.freescale.com/files/32bit/doc/app_note/AN4509.pdf ) for reduce CPU clock but meet with problems.

 

1. I do not have /sys/devices/platform/imx_busfreq.0 entry (CONFIG_ARM_IMX6Q_CPUFREQ enabled). It means that BUSFREQ driver not loading and I don't understand why.

2. There are only two available frequencies in the /sys/devices/system/cpu/cpu0/cpufreq :

/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_available_frequencies

792000 996000

3. How to automatically re-mount SD rootfs after exit from "echo mem > /sys/power/state" state?

 

Please help me resolve this issues.

 

My linux kernel is 3.14.52 from Yocto (Jethro branch). Processor is i.MX6Q, SabreSD-based custom board.

Thank you.

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