samsung-m0: max170x driver eating CPU

Describe your issue

What's the expected behaviour?

The IRQ handler use little CPU

What's the current behaviour?

The irq/109-max170xx_battery kernel thread uses 45% of a CPU core

How to reproduce your issue?

Just installed latest edge build for Samsung Galaxy SIII

Note: I had to do the /lib/firmware/brcm/brcmfmac4334-sdio.samsung,i9305.txt workaround to have wifi. See here for details.

What device are you using?

samsung-m0

On what postmarketOS version did you encounter the issue?

• edge (master branch)

• v22.06

• I confirm that the issue still is present after running sudo apk upgrade -a

On what environment did you encounter the issue?

Environments

• Phosh
• Plasma Mobile
• Sxmo (Wayland/Sway) Please post the output of sxmo_version.sh
• Other: Please fill out

How did you get postmarketOS image?

• from https://images.postmarketos.org
• I built it using pmbootstrap
• It was preinstalled on my device

What's the build date of the image? (in yyyy-mm-dd format)

20221109-1302

Additional information

vmstat 1

procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 2  0      0  36888   2560 107128    0    0     0     0 3683 1459  3 31 66  0  0
 1  0      0  36888   2560 107128    0    0     0     0 3551 1304  2 29 69  0  0
 2  0      0  37096   2560 107140    0    0     4     0 3544 1487  1 32 66  0  0
 2  0      0  37068   2560 107140    0    0     0     0 3553 1383  2 31 67  0  0
 1  0      0  37068   2560 107140    0    0     0     0 3633 1449  1 29 70  0  0
^C

ps faux

Load average: 2.86 2.35 2.11 2/392 9825
  PID  PPID USER     STAT   VSZ %VSZ CPU %CPU COMMAND
   71     2 root     SW       0   0%   1  12% [irq/109-max170x]
 1814   992 root     S     4628   0%   2   7% /sbin/udevd
  992     1 root     S     4632   0%   0   5% /sbin/udevd
 2163     1 root     S     7092   1%   3   2% /usr/libexec/upowerd

top -d 1

Tasks: 205 total,   3 running, 202 sleeping,   0 stopped,   0 zombie
%Cpu(s):  2.7 us, 30.3 sy,  0.0 ni, 67.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
MiB Mem :    995.6 total,     25.7 free,    853.5 used,    116.4 buff/cache
MiB Swap:      0.0 total,      0.0 free,      0.0 used.     44.0 avail Mem 

   71 root     -51   0       0      0      0 S  45.1   0.0  49:18.02 irq/109-max170xx_battery                                                                                                                                                   
 1814 root      20   0    4628    760    268 S  30.4   0.1  28:30.06 udevd                                                                                                                                                                      
  992 root      20   0    4632    824    340 S  18.6   0.1  17:56.80 udevd                                                                                                                                                                      
 2163 root      20   0    7160   2772   1216 S   9.8   0.3   9:03.02 upowerd