GPU[gk20a] Power Management in Jetson tk1

Hi,

Seen that GPU[gk20a] is under run time power management. Code is located: drivers/gpu/nvgpu/gk20a/gk20a.c

Could you please let me know about
what cases / events GPU[gk20a] will be powered on in Jetson tk1,
what is the condition & status GPU[gk20a] will be powered down in Jetson tk1.

Using the following command to know status of GPU[gk20a] power on / off status:
cat /sys/kernel/debug/powergate

Thank you very much

Do you have HDMI attached? You might find these wiki pages useful:

http://elinux.org/Jetson/Jetson_TK1_Power#Controlling_the_performance_and_power_draw
http://elinux.org/Jetson/Performance#Controlling_GPU_performance

Hi,

Thanks for information, which I have already gone through it.

My request in the question is

Could you please let me know about

what cases / events GPU[gk20a] will be powered on in Jetson tk1,
what is the condition & status GPU[gk20a] will be powered down in Jetson tk1.

You could refer to TRM description about GPU PLL and GPU power gating. In general, the software you develop should not worry about power on/off GPU. What you would concern is generally system power of the device under certain use case.