On Wed, Nov 28, 2018 at 08:23:37PM +0800, Andy Yan wrote: > Hi : > Andy Yan <andys...@gmail.com> 于2018年11月28日周三 下午7:10写道： > > > Hi: > > Priit Laes <pl...@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 <oli...@schinagl.nl> > >> Signed-off-by: Priit Laes <pl...@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. > > > > root@lime2:~# > > root@lime2:~# > > root@lime2:~# > > root@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@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@lists.denx.de > >> https://lists.denx.de/listinfo/u-boot > >> > > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
