Linux BSP can suspend only one time.

takayuki_ishii — Mon, 20 Jan 2020 13:15:56 GMT

Hello community,

I'm trying to suspend/resume function with i.MX6Q SABRE-AI + base board.

Using Linux BSP is a L4.19.35-1.1.0

In first time, it is success to suspend by following command and success to resume by button on base board.

> echo mem > /sys/power/state

root@imx6qsabreauto:~# echo mem > /sys/power/state
PM: suspend entry (deep)
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.001 seconds) done.
OOM killer disabled.
Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
PM: suspend devices took 0.050 seconds
Disabling non-boot CPUs ...
CPU1 killed.
CPU2 killed.
IRQ 17: no longer affine to CPU3
CPU3 killed.
Enabling non-boot CPUs ...
CPU1 is up
CPU2 is up
CPU3 is up
PM: resume devices took 0.060 seconds
OOM killer enabled.
Restarting tasks ... done.
PM: suspend exit
root@imx6qsabreauto:~# ata1: SATA link down (SStatus 0 SControl 300)

But try to suspend after resume, it will be failed.

root@imx6qsabreauto:~# ata1: SATA link down (SStatus 0 SControl 300)
echo mem > /sys/power/state
PM: suspend entry (deep)
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.001 seconds) done.
OOM killer disabled.
Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
dpm_run_callback(): egalax_ts_suspend+0x0/0x3c returns -6
PM: Device 1-0004 failed to suspend: error -6
PM: Some devices failed to suspend, or early wake event detected
PM: resume devices took 0.020 seconds
OOM killer enabled.
Restarting tasks ... done.
PM: suspend exit
-sh: echo: write error: No such device or address
root@imx6qsabreauto:~# ata1: SATA link down (SStatus 0 SControl 300)
random: crng init done
random: 7 urandom warning(s) missed due to ratelimiting

In third time, it will dump some trace log.

echo mem > /sys/power/state
PM: suspend entry (deep)
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.001 seconds) done.
OOM killer disabled.
Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
------------[ cut here ]------------
WARNING: CPU: 2 PID: 585 at kernel/irq/devres.c:146 devm_free_irq+0x78/0x80
Modules linked in: mxc_v4l2_capture ipu_bg_overlay_sdc ipu_still ipu_prp_enc ipu_csi_enc ipu_fg_overlay_sdc adv7180_tvin v4l2_int_device mxc_dcic galcore(O)
CPU: 2 PID: 585 Comm: sh Tainted: G O 4.19.35-1.1.0+g0f9917c #1
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[<8010f7a0>] (unwind_backtrace) from [<8010b798>] (show_stack+0x10/0x14)
[<8010b798>] (show_stack) from [<80a109a8>] (dump_stack+0x78/0x8c)
[<80a109a8>] (dump_stack) from [<8012f24c>] (__warn+0xd4/0xf0)
[<8012f24c>] (__warn) from [<8012f2a8>] (warn_slowpath_null+0x40/0x48)
[<8012f2a8>] (warn_slowpath_null) from [<8017856c>] (devm_free_irq+0x78/0x80)
[<8017856c>] (devm_free_irq) from [<806a253c>] (egalax_ts_suspend+0x1c/0x3c)
[<806a253c>] (egalax_ts_suspend) from [<80541520>] (dpm_run_callback.constprop.5+0x48/0xd0)
[<80541520>] (dpm_run_callback.constprop.5) from [<80542124>] (__device_suspend+0xf0/0x390)
[<80542124>] (__device_suspend) from [<805433d0>] (dpm_suspend+0x114/0x20c)
[<805433d0>] (dpm_suspend) from [<8016e368>] (suspend_devices_and_enter+0xec/0x60c)
[<8016e368>] (suspend_devices_and_enter) from [<8016ebdc>] (pm_suspend+0x354/0x3ac)
[<8016ebdc>] (pm_suspend) from [<8016d56c>] (state_store+0x6c/0xcc)
[<8016d56c>] (state_store) from [<8028b154>] (kernfs_fop_write+0xe8/0x1c8)
[<8028b154>] (kernfs_fop_write) from [<80217a44>] (__vfs_write+0x2c/0x160)
[<80217a44>] (__vfs_write) from [<80217d00>] (vfs_write+0xa4/0x17c)
[<80217d00>] (vfs_write) from [<80217f18>] (ksys_write+0x4c/0xac)
[<80217f18>] (ksys_write) from [<80101000>] (ret_fast_syscall+0x0/0x54)
Exception stack(0xd8a1ffa8 to 0xd8a1fff0)
ffa0: 00000004 00e5cee0 00000001 00e5cee0 00000004 00000000
ffc0: 00000004 00e5cee0 76eaebe0 00000004 00e5cee0 00000004 00000000 00000000
ffe0: 00000070 7ea2c938 76ddad44 76e3446c
---[ end trace 20e3247c9a996374 ]---
------------[ cut here ]------------
WARNING: CPU: 2 PID: 585 at kernel/irq/manage.c:1600 __free_irq+0xb4/0x310
Trying to free already-free IRQ 146
Modules linked in: mxc_v4l2_capture ipu_bg_overlay_sdc ipu_still ipu_prp_enc ipu_csi_enc ipu_fg_overlay_sdc adv7180_tvin v4l2_int_device mxc_dcic galcore(O)
CPU: 2 PID: 585 Comm: sh Tainted: G W O 4.19.35-1.1.0+g0f9917c #1
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[<8010f7a0>] (unwind_backtrace) from [<8010b798>] (show_stack+0x10/0x14)
[<8010b798>] (show_stack) from [<80a109a8>] (dump_stack+0x78/0x8c)
[<80a109a8>] (dump_stack) from [<8012f24c>] (__warn+0xd4/0xf0)
[<8012f24c>] (__warn) from [<8012eeb0>] (warn_slowpath_fmt+0x48/0x6c)
[<8012eeb0>] (warn_slowpath_fmt) from [<8017443c>] (__free_irq+0xb4/0x310)
[<8017443c>] (__free_irq) from [<80174710>] (free_irq+0x38/0x8c)
[<80174710>] (free_irq) from [<80178544>] (devm_free_irq+0x50/0x80)
[<80178544>] (devm_free_irq) from [<806a253c>] (egalax_ts_suspend+0x1c/0x3c)
[<806a253c>] (egalax_ts_suspend) from [<80541520>] (dpm_run_callback.constprop.5+0x48/0xd0)
[<80541520>] (dpm_run_callback.constprop.5) from [<80542124>] (__device_suspend+0xf0/0x390)
[<80542124>] (__device_suspend) from [<805433d0>] (dpm_suspend+0x114/0x20c)
[<805433d0>] (dpm_suspend) from [<8016e368>] (suspend_devices_and_enter+0xec/0x60c)
[<8016e368>] (suspend_devices_and_enter) from [<8016ebdc>] (pm_suspend+0x354/0x3ac)
[<8016ebdc>] (pm_suspend) from [<8016d56c>] (state_store+0x6c/0xcc)
[<8016d56c>] (state_store) from [<8028b154>] (kernfs_fop_write+0xe8/0x1c8)
[<8028b154>] (kernfs_fop_write) from [<80217a44>] (__vfs_write+0x2c/0x160)
[<80217a44>] (__vfs_write) from [<80217d00>] (vfs_write+0xa4/0x17c)
[<80217d00>] (vfs_write) from [<80217f18>] (ksys_write+0x4c/0xac)
[<80217f18>] (ksys_write) from [<80101000>] (ret_fast_syscall+0x0/0x54)
Exception stack(0xd8a1ffa8 to 0xd8a1fff0)
ffa0: 00000004 00e5cee0 00000001 00e5cee0 00000004 00000000
ffc0: 00000004 00e5cee0 76eaebe0 00000004 00e5cee0 00000004 00000000 00000000
ffe0: 00000070 7ea2c938 76ddad44 76e3446c
---[ end trace 20e3247c9a996375 ]---
dpm_run_callback(): egalax_ts_suspend+0x0/0x3c returns -6
PM: Device 1-0004 failed to suspend: error -6
PM: Some devices failed to suspend, or early wake event detected
PM: resume devices took 0.020 seconds
ata1: SATA link down (SStatus 0 SControl 300)
OOM killer enabled.
Restarting tasks ... done.
PM: suspend exit
-sh: echo: write error: No such device or address
root@imx6qsabreauto:~#

On android BSP N7.1.2-2.0.0, it success to suspend/resume by sw5 on base board.

Why can't Linux BSP suspend properly?

Best regards,

Ishii.

Re: Linux BSP can suspend only one time.

igorpadykov — Thu, 23 Jan 2020 11:01:30 GMT

Hi Ishii

from log issue is caused by touchscreen:

"dpm_run_callback(): egalax_ts_suspend+0x0/0x3c returns -6
PM: Device 1-0004 failed to suspend: error -6
PM: Some devices failed to suspend, or early wake event detected"

It is known issue with latest AI boards (early revisions like SPF-27142_B1 do not have

such issue) and caused by U1514 on p.15 SPF-27142_d_x4 from

Design files for i.MX 6Quad and i.MX 6DualLite CPU1 Cards

Explanations are given on p.15 that schematic:

"The MCIMX-LVDS1 display with touch can be placed in Sleep
through the I2C port. However, INT_B must be driven
with a falling edge to wake up the display, which is not
allowed due to U1514."

I sent additional details via mail.

Best regards
igor
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Re: Linux BSP can suspend only one time.

takayuki_ishii — Fri, 24 Jan 2020 06:45:18 GMT

Hello Igor,

Thank you for your reply.

It was fixed this problem by your suggestion by mail.

Best regards,

Ishii.

topic Linux BSP can suspend only one time. in i.MX Processors

Linux BSP can suspend only one time.

Re: Linux BSP can suspend only one time.

Re: Linux BSP can suspend only one time.