resume from suspend issue on imx53qsb mainline kernel

[alexeym]

Hello all,

I'm trying to use on imx53qsb with mc34708 pmic. And stuck with resume from suspend. It stops to resume after 5-15 cycles.(maybe more)

WEC7 BSP works fine on the same board.

It doesn't matter what IRQ line I'am using to wake up, I tried buttons with

gpio-key,wakeup; in dts, and waking up from ttymxc0 ( debug console)

cd /sys/class/tty/ttymxc0/

echo enabled > power/wakeup

after some I see

[ 1394.555344] PM: Syncing filesystems ... done.

[ 1394.746289] PM: Preparing system for mem sleep

[ 1394.753918] Freezing user space processes ... (elapsed 0.001 seconds) done.

[ 1394.762553] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.

[ 1394.771342] PM: Entering mem sleep

[ 1394.843168] PM: suspend of devices complete after 67.680 msecs

[ 1394.850220] PM: late suspend of devices complete after 1.061 msecs

[ 1394.857804] PM: noirq suspend of devices complete after 1.340 msecs

[ 1394.864107] Disabling non-boot CPUs ...

And thats it.

Looks like About iMX53 suspend/resume issue  is totally related to my issue. But still nobody solved it?

[igorpadykov]

Hi alexeym

mc34708 pmic is not used on SMD board, so link

About iMX53 suspend/resume issue

is not applicable to your case. One can to try Freescale BSP:

L2.6.35_11_09_ER_SOURCE  : Linux 2.6.35 Source Code Files

and documentation 11.09. Supports MCIMX53-START and MCIMX53-START-R.

IMX53_LINUX_1109_BSP_PATCH  : Patch based on L2.6.35_11_09_ER_SOURCE,

to provide: GPU driver update, Uboot update for plugin mode support on Ripley QSB,

VPU firmware update and other fixes.

Also please check

i.mx53 qsb resume from suspend issue

Sleep/Suspend/Power Off on i.MX53 Kernel 3.0.15

For i.MX53 mainline kernel issues suggest to post on

meta-fsl-arm mailing list, so that someone familiar with mainline could try to assist you.

https://lists.yoctoproject.org/listinfo/meta-freescale

Best regards

igor

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[alexeym]

Thank you for answer, anyway later investigation makes me think that problem is not in mc34708 pmic, but in SOC somewhere.

I've put some messages in:

static int mx5_suspend_enter(suspend_state_t state) from pm-imx5.c

and I see printk message right before

cpu_do_idle() function which is macro really calls cpu_v7_do_idle from proc-v7.S

And I don't see that CPU pulls STANDBY pad in any way, pmic don't know anything about cpu low power mode.

So problem is somewhere in those 3 ARM instructions:

dsb @ WFI may enter a low-power mode

wfi

ret lr

Have no idea where to move next.

[alexeym · Accepted solution]

Here is fix:

[RFC PATCH] staging: imx-drm: add suspend / resume