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

Thu Nov 29 00:45:03 UTC 2018

Hi :
Priit Laes <plaes at plaes.org> 于2018年11月28日周三 下午10:23写道：

> On Wed, Nov 28, 2018 at 08:23:37PM +0800, Andy Yan wrote:
> > 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 .
>
> This is a hw issue in rev.K. Please contact Olimex.
>


Got it, thanks a lot

> >
> >
> > >  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
> > >> _______________________________________________
> > >> U-Boot mailing list
> > >> U-Boot at lists.denx.de
> > >> https://lists.denx.de/listinfo/u-boot
> > >>
> > >
>