Re: Power Management issues in MPC8313 processor
Hello Scott, I am using 2.6.27 - I am trying to add Power Management support to an older product. Thanks, Srivatsan On Fri, Oct 26, 2012 at 8:27 PM, Scott Wood wrote: > On 10/25/2012 05:07:01 PM, Srivatsan Canchivaram wrote: > >> Hi, >> >> >> I have a modem with a Freescale MPC8313E processor. I am trying to enable >> power savings in the processor by placing it in Standby mode and resume >> normal operation with a Wake-On-LAN magic packet. >> >> >> Following the directions in the Freescale Power Management app note, I >> enabled Power Management Support in the Linux kernel and device tree >> configurations. >> >> >> I ran the following command on the board: >> >> echo standby > /sys/power/state >> >> >> This caused the console to hang and there was no further response to >> keyboard inputs. I enabled ‘no_console_suspend’ in the kernel and when I >> loaded the new build and enabled standby mode, I observed an Oops trace: >> >> >> >> RASCOM_QCU.7.0.0013 $ echo standby > /sys/power/state >> >> <6>PM: Syncing fFreezing user space processes ... ilesystems ... <7>PM: >> Entering standby sleep >> >> Unable to handle kernel paging request for instruction fetch >> >> Faulting instruction address: 0x616d6570 >> >> Oops: Kernel access of bad area, sig: 11 [#1] >> >> MPC831x RDB >> >> Modules linked in: dsp rcspi modem i2c_mpc thermal_sys lm92 hwmon [last >> unloaded: modem] >> >> NIP: 616d6570 LR: c0165224 CTR: 616d6573 >> >> REGS: cd087d30 TRAP: 0400 Not tainted (2.6.27) >> >> MSR: 20001032 CR: 28002024 XER: 2000 >> >> TASK = cc312400[1196] 'echo' THREAD: cd086000 >> >> GPR00: 0002 cd087de0 cc312400 cf821800 cd087de8 0002 c06e >> c06da4a0 >> >> GPR08: c06da948 616d6573 3fff c06c6308 28002022 10091248 0fffc000 >> 100050b8 >> >> GPR16: 1008a270 10068810 100687c8 10068814 1008c284 1008c294 >> c0246180 >> >> GPR24: c02ab9e4 c02ab9dc c06cc4f4 0006 cd087e08 0002 c06c595c >> cf821808 >> >> NIP [616d6570] 0x616d6570 >> >> LR [c0165224] platform_pm_suspend_noirq+**0x84/0x88 >> > > What kernel are you using? platform_pm_suspend_noirq was removed by this > commit: > > commit 9b39e73d0c2b265a7f8748b0e9a9f0**9be84079a8 > Author: Rafael J. Wysocki > Date: Sun Dec 18 00:34:24 2011 +0100 > > PM / Sleep: Remove forward-only callbacks from platform bus type > > The forward-only PM callbacks provided by the platform bus type are > not necessary any more, because the PM core executes driver callbacks > when the corresponding subsystem callbacks are not present, so drop > them. > > Signed-off-by: Rafael J. Wysocki > > It seems that a driver's pm ops are getting corrupted -- maybe used after > freeing? Have you tried enabling slab/slub debug? > > Can you instrument the code to see if there are any fields in the device > struct that aren't corrupt, that could point out which device this is? > > > I found another thread that dealt with Power Management issues on the >> Freescale MPC8313 processor: >> >> https://lists.ozlabs.org/**pipermail/linuxppc-dev/2012-** >> January/095240.html<https://lists.ozlabs.org/pipermail/linuxppc-dev/2012-January/095240.html> >> >> The resolution of this issue seems to be related to the JTAG TRST pin >> being >> disabled. This is not relevant in my case as the TRST on my board is >> already inactive. >> > > If you were seeing that, you'd see a hang rather than an oops. > > -Scott > ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Power Management issues in MPC8313 processor
Hi,
I have a modem with a Freescale MPC8313E processor. I am trying to enable
power savings in the processor by placing it in Standby mode and resume
normal operation with a Wake-On-LAN magic packet.
Following the directions in the Freescale Power Management app note, I
enabled Power Management Support in the Linux kernel and device tree
configurations.
I ran the following command on the board:
echo standby > /sys/power/state
This caused the console to hang and there was no further response to
keyboard inputs. I enabled ‘no_console_suspend’ in the kernel and when I
loaded the new build and enabled standby mode, I observed an Oops trace:
RASCOM_QCU.7.0.0013 $ echo standby > /sys/power/state
<6>PM: Syncing fFreezing user space processes ... ilesystems ... <7>PM:
Entering standby sleep
Unable to handle kernel paging request for instruction fetch
Faulting instruction address: 0x616d6570
Oops: Kernel access of bad area, sig: 11 [#1]
MPC831x RDB
Modules linked in: dsp rcspi modem i2c_mpc thermal_sys lm92 hwmon [last
unloaded: modem]
NIP: 616d6570 LR: c0165224 CTR: 616d6573
REGS: cd087d30 TRAP: 0400 Not tainted (2.6.27)
MSR: 20001032 CR: 28002024 XER: 2000
TASK = cc312400[1196] 'echo' THREAD: cd086000
GPR00: 0002 cd087de0 cc312400 cf821800 cd087de8 0002 c06e
c06da4a0
GPR08: c06da948 616d6573 3fff c06c6308 28002022 10091248 0fffc000
100050b8
GPR16: 1008a270 10068810 100687c8 10068814 1008c284 1008c294
c0246180
GPR24: c02ab9e4 c02ab9dc c06cc4f4 0006 cd087e08 0002 c06c595c
cf821808
NIP [616d6570] 0x616d6570
LR [c0165224] platform_pm_suspend_noirq+0x84/0x88
Call Trace:
[cd087de0] [c0167e6c] pm_dev_dbg+0x70/0x18c (unreliable)
[cd087df0] [c0167cb4] pm_noirq_op+0x58/0xc8
[cd087e00] [c0168e08] device_power_down+0x78/0x1c4
[cd087e40] [c00471bc] suspend_devices_and_enter+0x1ec/0x258
[cd087e70] [c00473ac] enter_state+0x13c/0x198
[cd087e90] [c00474bc] state_store+0xb4/0xf8
[cd087eb0] [c013af68] kobj_attr_store+0x24/0x3c
[cd087ec0] [c00bf734] sysfs_write_file+0xe8/0x1e8
[cd087ef0] [c0078bbc] vfs_write+0xb4/0x16c
[cd087f10] [c0078d7c] sys_write+0x4c/0xa4
[cd087f40] [c000fa88] ret_from_syscall+0x0/0x38
--- Exception: c01 at 0x4802679c
LR = 0x4803f0e8
Instruction dump:
---[ end trace b6a2457eea68b760 ]---
done.
<7>PM: Preparing system for standby sleep
<1>Freezing user space processes ... <7>PM: Entering standby sleep
<7>platform mpc83xx_wdt.0: preparing suspend
<7>fsl-gianfar fsl-gianfar.0: preparing suspend
<7>fsl-gianfar fsl-gianfar.1: preparing suspend
<7>fsl-gianfar_mdio fsl-gianfar_mdio.14: preparing suspend
<7>serial8250 serial8250.0: preparing suspend
<7>serial8250 serial8250: preparing suspend
<7>platform Fixed MDIO bus.0: preparing suspend
<7>lm92 0-0049: legacy suspend
<7>lm92 0-0048: legacy suspend
<7>platform Fixed MDIO bus.0: suspend
<7>mdio_bus 24520:1f: legacy suspend
<7>Generic PHY 24520:01: legacy suspend
<7>Generic PHY 24520:00: legacy suspend
<7>serial8250 serial8250: suspend
<7>of_platform ee000600.timer: legacy suspend
<7>of_platform ee000500.timer: legacy suspend
<7>mpc83xx-pmc ee000b00.power: legacy suspend
<7>of_platform ee000700.pic: legacy suspend
<7>of_platform ee03.crypto: legacy suspend
<7>of_platform ee004600.serial: legacy suspend
<7>of_platform ee004500.serial: legacy suspend
<7>of_platform ee025000.ethernet: legacy suspend
<7>of_platform ee024000.ethernet: legacy suspend
<7>of_platform ee024520.mdio: legacy suspend
<7>of_platform ee024e00.ptimer: legacy suspend
<7>of_platform ee0082a8.dma: legacy suspend
<7>mpc-i2c ee003100.i2c: legacy suspend
<7>mpc-i2c ee003000.i2c: legacy suspend
<7>of_platform ee000200.wdt: legacy suspend
<7>of_platform ee00.soc8313: legacy suspend
<7>of-flash fc00.flash: legacy suspend
<7>of_platform ee005000.localbus: legacy suspend
<7>serial8250 serial8250.0: suspend
<7>fsl-gianfar_mdio fsl-gianfar_mdio.14: suspend
<7>fsl-gianfar fsl-gianfar.1: suspend
<7>fsl-gianfar fsl-gianfar.0: suspend
<7>platform mpc83xx_wdt.0: suspend
<6>PM: suspend devices took 0.000 seconds
<7>platform Fixed MDIO bus.0: LATE suspend
<7>serial8250 serial8250: LATE suspend
<7>serial8250 serial8250.0: LATE suspend
<7>fsl-gianfar_mdio fsl-gianfar_mdio.14: LATE suspend
<1>Unable to handle kernel paging request for instruction fetch
<1>Faulting instruction address: 0x616d6570
<1>Oops: Kernel access of bad area, sig: 11 [#1]
<1>MPC831x RDB
<1>Modules linked in: dsp rcspi modem i2c_mpc thermal_sys lm92 hwmon [last
unloaded: modem]
<1>NIP: 616d6570 LR: c0165224 CTR: 616d6573
<1>REGS: cd087d30 TRAP: 0400 Not tainted (2.6.27)
<1>MSR: 20001032 CR: 28002024 XER: 2000
<1>TASK = cc312400[1196] 'echo' THREAD: cd086000
<6>GPR00: 0002 cd087de0 cc312400 cf821800 cd087de8 0002 c06e
c06da4a0
<6>GP
