[Bug 222021] Not charging via USB C after Kernel update "underpowered" Dell XPS + workaround

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=222021

--- Comment #7 from SpliNter (splint.em85@gmail.com) ---
Tested 7.3.0-rc6 with the patch.
Kernel: Arch linux-mainline 7.3rc6-2 with the patch added, default config
(uname: 7.3.0-rc6-2-mainline-dirty).

Summary: charging works on plug-in with and without the patch (as it already
did on 7.2.9). The remaining symptoms (UCSI error, status flapping) are not
changed by the patch.

- AC plugged in while running (~352 s uptime): "ucsi_acpi USBC000:00: unknown
error 0" + "UCSI_GET_PDOS failed (-5)" appears twice (352.38 s and 352.87 s).
Unpatched 7.3.0-rc6 had it once at the same event (396.2 s).
- No UCSI error at boot this time (unpatched: one at 9.2 s). This is a single
boot, so I would not read much into it.
- udevadm monitor --subsystem-match=power_supply: identical to the unpatched
run: 4 changes of ucsi-source-psy-USBC000:003 within ~6 s, 1x AC, 2x BAT0.
- The desktop battery status flaps on plug-in: "plugged in but discharging" ->
"not charging" -> "charging" (3 states).
BAT0 ends up as "Charging", so the battery does charge, which fixes my issue.

Unpatched 7.3.0-rc6 and 7.2.9 behave the same.

Thank you for the effort.

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