Hey Jagan,
FYI,
I used the wrong e-mail address, I think it is still listed in some of
the u-boot sources.
Olliver
On 01-03-17 15:06, Olliver Schinagl wrote:
Hey Maxime, Jagan,
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.
Appologies, I did check the u-boot page, where sunxi is still listed as
orphaned and the AXP stuff does not show up with the sunxi maintainers.
@Jagan, do you wish for me to resend the series, or can you see them via
the linux-sunxi list?
Olliver
Maxime
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