[U-Boot] [PATCH v3 0/9] Stop AXP from crashing when enabling LDO3

[Andy Yan]

Hi :
Andy Yan <andyshrk at gmail.com> 于2018年11月28日周三 下午7:10写道：

> Hi:
> Priit Laes <plaes at plaes.org> 于2018年11月22日周四 上午2:06写道：
>
>> This is a resend/v2 of a "Stop AXP from crashing when enabling LDO3"
>> series,
>> posted by Olliver Schinagl in March 2017. Unfortunately it never got past
>> initial discussion [1], but most Olimex Lime2 boards are still running
>> into this bug.
>>
>> When powering up an AXP209, the default value for LDO3 output is enabled.
>> This
>> works fine. However if for whatever reason, LDO3 is disabled, for example
>> by OS
>> during reboot and u-boot enables LDO3 again, the PMIC shuts down (without
>> setting an interrupt) causing the board to hang. This behavior has been
>> seen
>> from Linux as well, u-boot disables LDO3 as a default value, the kernel
>> enables
>> it per its DTS, the kernel hangs as the PMIC gets shut down.
>>
>> The root cause is that some boards have too high capacitance on the LDO3
>> output
>> port causing inrush currents exceeding the maximum of the AXP209.
>>
>> The fix is to turn on the LDO3 at the lowest possible voltage and then
>> set the
>> final voltage.
>>
>> If the capacitance is really big (due to a connected device for example)
>> the
>> AXP209 also features VRC, or Voltage Rate Control, allowing voltage to
>> ramp up
>> even slower.
>>
>> Similar changes need to be also implemented in the operating system driver
>> side when driver needs to toggle power for the ALDO3 regulator.
>>
>> This patch series implements the above with a few tiny cleanups.
>>
>> The initial discussion with some scope screenshots can be found in the
>> linux-sunxi mailing list [0].
>>
>> And the initial series were posted to u-boot mailing list [1].
>>
>> Signed-off-by: Olliver Schinagl <oliver at schinagl.nl>
>> Signed-off-by: Priit Laes <plaes at plaes.org>
>>
>> [0] https://groups.google.com/forum/m/#!topic/linux-sunxi/EDvEsbHHqQI
>> [1] https://lists.denx.de/pipermail/u-boot/2017-March/282789.html
>>
>> --
>> Changes since v2:
>> - Collected Acked-by tags, patches 1,3-5 are now ripe for picking.
>> - Olliver fixed wrong code in patch 2, thanks for Maxime for spotting
>> - Fixed checkpatch error in patch 5
>> - Expanded commit message for patch 6
>>
>> Changes from initial submission:
>> - Rebased on top of latest master and fixed conflicts
>> - Added comments about datasheet errors for patch 6
>> - Fixed some typos and checkpatch errors
>> - Added patch to Olimex Lime2 eMMC board
>>
>> Olliver Schinagl (8):
>>   sunxi: board: Print error after power initialization fails
>>   sunxi: pmic_bus: Decrease boot time by not writing duplicate data
>>   power: axp209: Use BIT() macro
>>   power: axp209: Define the chip version mask
>>   power: axp209: Reduce magic values by adding defines for LDO[234]
>>   power: axp209: Add support for voltage rate control on LDO3
>>   power: axp209: Limit inrush current for broken boards
>>   arm: sunxi: Reduce inrush current on Olimex OLinuXino-A20-Lime2
>>
>> Priit Laes (1):
>>   arm: sunxi: Reduce inrush current on Olimex OLinuXino-A20-Lime2-eMMC
>>
>>  arch/arm/mach-sunxi/pmic_bus.c             |  6 ++-
>>  board/sunxi/board.c                        | 18 +++---
>>  configs/A20-OLinuXino-Lime2-eMMC_defconfig |  2 +-
>>  configs/A20-OLinuXino-Lime2_defconfig      |  2 +-
>>  drivers/power/Kconfig                      | 43 ++++++++++++++-
>>  drivers/power/axp209.c                     | 66 ++++++++++++++++++----
>>  include/axp209.h                           | 70 +++++++++++++++++------
>>  7 files changed, 172 insertions(+), 35 deletions(-)
>>
>> base-commit: a3e1653ddeb02f39481eba572275016171e9670c
>>
>
>
> I also play with a Lime2-eMMC board(rev K) these days,  but I found this
> board could do reboot whatevery in u-boot or kernel when it boot from
> emmc.  But it reboot well when it boot from sdcard.
>
>
Sorry I mean this board couldn't do reboot from kernel or u-boot here .


>  root at lime2:~#
> root at lime2:~#
> root at lime2:~#
> root at lime2:~# reboot
> [ 2089.632091] reboot: Restarting system
>
> Can't see any further reboot log. unless i replug the power jack.
>
>
>
>
>
> When I do reset from u-boot , it failed too:
>
> Boot SPL 2018.05-armbian (Nov 28 2018 - 14:39:04 +0800)
> DRAM: 3/2/2
> Trying to boot from MMC2
>
>
> U-ready
> DRAM:  1 GiB
> MMC:   SUNXI MMC: 1
> Loading Environment from EXT4... MMC: no card present
> ** Bad device mmc 0 **
> In:    serial
> Out:   serial
> Err:   serial
> Allwinner mUSB OTG (Peripheral)
> SCSI:  SATA link 0 timeout.
> A: ethernet at 01c50000
> Warning: usb_ether using MAC address from ROM
> , eth1: usb_ether
> MMC: no card present
> ** Bad device mmc 0 **
> us 0 for devices... 1 USB Device(s) found
> scan1 USB Device(s) found
>        scaswitch to partitions #0, OK
> mmc1(part MMC: no card present
> => <INTERRUPT>
> =>
> => reset
> resetting ...
>
> I post these here hope to know if anyone meet the same situtation.
>
>
> --
>> git-series 0.9.1
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>