[U-Boot] [PATCH 0/8] Stop AXP from crashing when enabeling LDO3

Olliver Schinagl o.schinagl at ultimaker.com
Wed Mar 1 13:45:14 UTC 2017


Hey Maxime,

On 01-03-17 14:00, Maxime Ripard wrote:
> Hi Oliver,
>
> On Wed, Mar 01, 2017 at 01:52:16PM +0100, Olliver Schinagl wrote:
>> Hi list,
>>
>> 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 shutsdown (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 to 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, which allows the voltage
>> ramp up to be even slower.
>>
>> This patch series implements the above with a few tiny, cleanups I ran into
>> underway.
>>
>> The initial discussion with some scope screenshots can be found in the
>> linux-sunxi mailing list [0].
>
> If you don't CC the proper maintainers, no one is going to pick the patches.

who did I miss? I did use the get_maintainers script, and added you 
explicitly.

There is no sunxi custodian anymore, it is orphaned.

>
> Maxime
>


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