Device Freeze and reset right after resuming from suspend

[tkwon]

Hello,
I am working with Android Nougat build.

The kernel version is 4.9.17. and the CPU is Freescale i.MX6D rev1.6 at 792MHz.

The device freezes  right after resume, once out of 500 suspend/resume operation,

The last messages are as follow;

PM: suspend of devices complete after 85.648 msecs
PM: suspend devices took 0.090 seconds
PM: late suspend of devices complete after 1.387 msecs
PM: noirq suspend of devices complete after 1.397 msecs
Disabling non-boot CPUs ...
CPU1: shutdown
Resume caused by IRQ 51
Enabling non-boot CPUs ...
CPU1 is up
PM: noirq resume of devices complete after 0.930 msecs
PM: early resume of devices complete after 0.722 msecs
CPU1: update max cpu_capacity 1024

 ---  after this, the device reset with WDOG time out ---

Have you guys seen any issue like this before ? And having  any fix to try ?

Thanks and Regards,

Taehyuk Kwon

[igorpadykov]

Hi Taehyuk

in this case may be recommended to recheck ddr settings: try latest RPA tool

https://community.nxp.com/docs/DOC-236354 

run ddr test and then rebuild image with new calibration settings found from ddr test

i.MX6/7 DDR Stress Test Tool V3.00 

DRAM Customization on i.MX6x 

Best regards
igor
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[tkwon]

Hello Igor,

Thanks for your comments. I am running the calibration and trying to figure out how to apply the values.

I am modifying the bootable/bootloader/uboot-imx/board/freescale/mx6_horizon/mx6q_4x_mt41j128.cfg file. Is the right and the only place to be updated ?

Thanks and Regards,

Taehyuk Kwon

[igorpadykov]

HI Taehyuk

right, also may be useful to check that were used low power drivers as on below link

mach-imx\arm\arch - linux-imx - i.MX Linux kernel

Best regards
igor

[tkwon]

Hello Igor,

I have tried the memory calibration. Unfortunately, it does not make any difference.

I narrowed down where the crash happens.

in the file gckVGHARDWARE_SetPowerManagementState, function gckVGHARDWARE_SetPowerManagementState does not return, when it is called with state = gcvPOWER_ON. 

It is not always happens. It happens when the resume and suspend are done for about 300 times.

have you seen any similar known issue?

Thanks and Regards,

Taehyuk Kwon

[tkwon]

Correction, It is actually, kernel_imx/drivers/mxc/gpu-viv/hal/kernel/arch/gc_hal_kernel_hardware.c, gckHARDWARE_SetPowerManagementState.

Thanks and Regards,

Taehyuk Kwon