[Letux-kernel] Pyra charging

[David Shah]

Looks like the latest pyra u-boot implements this correctly:

https://dev.pyra-handheld.com/kernel/pyra-uboot/-/blob/pyra/board/dragonbox/omap5_pyra/board.c#L234-235

Either the images need to be updated; or for some reason the watchdog gets
enabled again after U-boot runs.

Best

David

On Mon, 2020-12-21 at 21:57 +0100, Michael Mrozek wrote:
> On Mo, 2020-12-21 at 20:22 +0000, David Shah wrote:
> 
> 
> Yes, and the result is 9c, so this is indeed what's resetting the
> value!
> 
> So it seems it's not disabled in the U-Boot version we're using.
> 
> Could someone update that?
> Thanks :D
> 
> 
> > Do you have this path instead, which should be the same thing?
> > 
> > /sys/class/power_supply/bq24297/device/registers
> > 
> > (my Pyra is on a 5.10 kernel atm so it might not be identical, but
> > iirc this
> > path existed on 5.6 too)
> > 
> > On Mon, 2020-12-21 at 21:03 +0100, Michael Mrozek wrote:
> > > On Mo, 2020-12-21 at 09:33 +0100, H. Nikolaus Schaller wrote:
> > > 
> > > That directory doesn't exist on my system:
> > > 
> > > root at evild-pyra:/sys/kernel/debug/regmap# ls -l
> > > total 0
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 0-0008
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 0-0048
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 0-0049
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 0-004a
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 0-004b
> > > drwxr-xr-x 2 root root 0 Dec 21 20:59 1-004f
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 2-0029
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 2-0076
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 3-0064
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 4-0022
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 4-0064
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 
> > > dummy-omap5_padconf_global at 5a0
> > > drwxr-xr-x 2 root root 0 Jan  1  1970 dummy-scm_conf at 0
> > > 
> > > Could it be that it has a different name / ID
> > > 
> > > > > Am 20.12.2020 um 21:54 schrieb Michael Mrozek
> > > > > <EvilDragon at openpandora.org>:
> > > > > 
> > > > > So if I want to limit the 3A input to 1A, it works - but 30 -
> > > > > 60
> > > > > seconds later, there's a KERNEL UDEV event reported - and it's
> > > > > back
> > > > > to
> > > > > 3A.
> > > > > 
> > > > > It's the same for the USB FTDI port as well. I can increase the
> > > > > limit -
> > > > > but it's being reset.
> > > > 
> > > > > So we need to find out what causes that reset. Is it the
> > > > > driver?
> > > > > What else could it be?
> > > > 
> > > > It could be the watchdog inside the bq24297. If that one expires
> > > > it
> > > > resets the chip and starts redetection of the power supply.
> > > > 
> > > > But I think we disable it in u-boot and the kernel driver.
> > > > 
> > > > Please check with
> > > > 
> > > > root at letux:~# fgrep 5: /sys/kernel/debug/regmap/1-006b/registers
> > > > 5: 8a
> > > > root at letux:~# 
> > > > 
> > > > If you see 9x, ax, bx the watchdog timer is enabled for 40, 80,
> > > > 120
> > > > seconds.
> > > > 
> > > > BR,
> > > > Nikolaus
> > > > 
> > > 
> > 
> > 
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