On Wed, Nov 21, 2018 at 08:05:24PM +0200, Priit Laes wrote: > 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.
Anything else that should be done by me, now that all the patches have Acked-by? Päikest, Priit _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
