This tutorial explains procedure to measure transition times and respected power values when either PS or PL suspends or wake up. By following below procedure, suspend and wake up time of APU, These procedures are for 2017.1 and later releases.  There are some differences for later releases which are indicated when appropriate.

Table of Contents

Different power states and measure transition time of APU and PL

Prebuilt binaries for reference

For 2017.1-4

For 2018.2 and above

To generate binaries on your own please refer below steps for generating required images/binaries.

Generating required images/binaries

Steps to build Linux images

Create petalinux project

Apply Linux kernel patch to signal wakeup

Minimum kernel configuration (v2017.x - v2018.2)

Default kernel configuration (v2018.3 - later)

Build petalinux

Steps to build RPU_0 baremetal

Steps to run the images

Boot Linux with RPU

Measure the power and transition times

Use Power Advantage tool for measuring power values.

All on (PS + PL)

PS all ON

3 APUs on/off

Frequency scaling (min frequency)

Suspend to RAM and FPD off

  1. Power off all 3 secondary APUs and set frequency of primary APU0 to minimum using above commands for minimum latency measurement.

  2. Run following command from Linux terminal to release unnecessary nodes and signal the RPU_0:

  3. Now, Linux will be suspended and it will be resumed by RPU after suspend. RPU has requested NODE_SATA from FPD, so Linux will be suspended with FPD on.

  4. After 10 second of Linux suspend, RPU application will release NODE_SATA. Once NODE_SATA is released, FPD will be off. Use Power Advantage Tool in these 10 seconds to get power value for Suspend to RAM.
    Following are print messages to identify these 10 second window.

    RPU0: ******************** RPU ON, APU suspend with FPD ON ******************
    RPU0: (10 seconds delay)
    RPU0: Release NODE_SATA, FPD will be off after releasing NODE_SATA
  5. Once FPD is off, RPU will resume APU after 10 second of FPD off. To measure power with FPD off, Use Power Advantage Tool in these 10 seconds.
    Following are two print messages to identify these 10 second window.

    RPU0: ******************** RPU ON, APU suspend with FPD OFF ******************
    RPU0: Suspended.
    RPU0: (10 seconds delay)
    RPU0: Resuming APU.
  6. Above loop will run for 3 times and print minimum, maximum and average values for latency. On console, you should able to see suspend/wakeup latency of APU from RPU print message as shown below.

    RPU0: Request Suspend Latency in useconds of Node NODE_APU_0:  Min: 42701, Max: 45728, Avg: 45058
    RPU0: FPD off Latency in useconds of Node NODE_APU_0:  Min: 5902, Max: 5902, Avg: 5902
    RPU0: FPD on Latency in useconds of Node NODE_APU_0:  Min: 121025, Max: 121251, Avg: 121116
    RPU0: APU0 Wakeup Latency in useconds of Node NODE_APU_0:  Min: 8061, Max: 8067, Avg: 8063
    RPU0: Wakeup Latency in useconds of Node NODE_APU_0:  Min: 14062, Max: 14088, Avg: 14080
  7. R5 Sleep and Deep-Sleep mode

  8. Once above measurements are done, RPU puts FPD in off state and goes to idle mode (wfi state) for 10 seconds.

  9. To measure power with R5 sleep mode, Use Power Advantage Tool in these 10 seconds.
    Following are two print messages to identify these 10 second window.

    RPU0: ******************** RPU idle, APU suspend with FPD OFF ******************
    RPU0: Go to RPU Sleep mode
    RPU0: (10 seconds timer)
  10. After 10 seconds RPU gets timer interrupt after that it suspend itself and goes to deep sleep mode for 10 seconds.

  11. After RPU goes to deep sleep, Use Power Advantage tool for measuring power values within these 10 seconds.
    Following are print messages to identify these 10 second window.

    RPU0: *************************** Deep Sleep Mode *********************
  12. After 10 seconds timer will generate interrupt and Resumes RPU. Then RPU resumes APU. This state is same as 3 APU off with minimum frequency.

    RPU0: Resume APU
    RPU0: **************** Demo executed successfully ********************
    RPU0: ******** Executing Typical power state demo again **************
  13. Now to measure latency/power from left to right of dimmer mode table, use below commands:

    1. Set max APU0 frequency using frequency scaling.

    2. Power on all 3 secondary APUs.

    3. Power on PL.

  14. To re-run demo execute from step 1 (This will work in 2019.2 and higher versions only).

Measure transition time of RPU

Prebuilt binaries for reference

To generate images on your own please refer below steps for generating required images/binaries.

Generating required images/binaries

Steps to build RPU_0 baremetal

Steps to build APU baremetal

Steps to run the images

Related Links