DM816x SmartReflex: how to verify smartreflex works

Guang Yang40

Hey,

I configured my DM8168 by following http://processors.wiki.ti.com/index.php?title=TI81XX_PSP_PM_AVS_Driver_User_Guide&redirect=no.

Upon startup I can see "smartreflex: Driver initialized", "registered ti816x_gpio_vr device" and "registered ti816x_sr device", so I'm assuming the smartreflex config takes effect. Also from the wiki page, it says the debug info. will be written to the /sys/kernel/debug/smartreflex/.

What I'm expecting is to see the currect_voltage changes when I launch/stop applications to change the system work load. While nothing changed actually, and actually by listing details of current_voltage, it's not modified at all! Do I misunderstand that the current_voltage value will keep writing to the file?

Could anyone show me the right way to verify whether the smartreflex works or not?

Many thanks.

Guang

over 11 years ago

0 Eason Wang over 11 years ago

TI__Genius 13460 points

Hi ,

You can add print into the set_voltage() function.When it is called it means smartreflex acts.

However, please be noted that smartreflex doesnt always react to the loading changes because the strategy is not only depending on that.

You can let hardware guys check the AVS voltage and check if it changes during the bootup procedure.

BR,

Eason

0 Guang Yang40 over 11 years ago in reply to Eason Wang

Prodigy 60 points

Hi Eason,

Thanks for your answer. I did add print info in the voltage setter, but can not see it's ever called. What other factors will be if the reaction doesn't only depend on DM8161's work load.?

Also is there a way to check the AVS voltage during bootup? Many people in this forum mentioned the bootup voltage changes, I just don't know how to capture that.

Thank you.

Guang

0 Pavel Botev over 11 years ago in reply to Guang Yang40

TI__Guru**** 170625 points

Guang,

See if the below wiki will be in help:

processors.wiki.ti.com/.../TI81XX_PSP_AVS_FAQ

Regards,
Pavel

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DM816x SmartReflex: how to verify smartreflex works