[Bug] Keychron Q4 doesn't boot since ChibiOS update

[juliekoubova]

Describe the Bug

I bisected between 0.24.11 and current master, and nothing after #23405 boots up on my Keychron Q4. It doesn't seem to talk to the host, there's nothing in dmesg after STM32 BOOTLOADER disconnects. Please let me know if I can help debugging this in any way.

Keyboard Used

keychron/q4/ansi/v2

Link to product page (if applicable)

No response

Operating System

Alpine Linux edge

qmk doctor Output

No response

Is AutoHotKey / Karabiner installed

• AutoHotKey (Windows)
• Karabiner (macOS)

Other keyboard-related software installed

No response

Additional Context

No response

[sigprof]

The likely culprit is qmk/ChibiOS@392367e (ChibiOS/ChibiOS@ebc3635 in the official mirror) — that change does not look correct, and probably results in testing of the LSERDY bit instead of the intended LSIRDY, therefore the wait loop becomes infinite. The affected stm32_lsi.inc file is used by the code for the G0xx, G4xx, L4xx, L4xx+, L5xx, MP1xx, WLxx families.