Hi, i get a serial console hang on booting my mt7622 bananapi r64 with 5.18.0 [ 0.591802] Serial: 8250/16550 driver, 3 ports, IRQ sharing disabled [ 0.599915] printk: console [ttyS0] disabled [ 0.624563] 11002000.serial: ttyS0 at MMIO 0x11002000 (irq = 126, base_baud = 1562500) is a 16550A git bisect points to this commit (cannot revert it alone) 6f81fdded0d024c7d4084d434764f30bca1cd6b1 is the first bad commit commit 6f81fdded0d024c7d4084d434764f30bca1cd6b1 Author: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> Date: Wed Apr 27 15:23:27 2022 +0200 serial: 8250_mtk: Make sure to select the right FEATURE_SEL Set the FEATURE_SEL at probe time to make sure that BIT(0) is enabled: this guarantees that when the port is configured as AP UART, the right register layout is interpreted by the UART IP. Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> Cc: stable <stable@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20220427132328.228297-3-angelogioacchino.delregno@xxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> drivers/tty/serial/8250/8250_mtk.c | 7 +++++++ 1 file changed, 7 insertions(+) merged by 6811a466d27b "Merge tag 'tty-5.18-rc7'" reverted these 2 commits works for me e1bfdbc7daca 2022-04-27 serial: 8250_mtk: Fix register address for XON/XOFF character 6f81fdded0d0 2022-04-27 serial: 8250_mtk: Make sure to select the right FEATURE_SEL have see this discussion [1], but can't manage to import mbox file to thunderbird yet regards Frank [1] https://lore.kernel.org/linux-arm-kernel/CAGXv+5Hx7cRwNzLWrExcFGy=MMOc3-0EbqCanv2E0G_DKXLCgg@xxxxxxxxxxxxxx/#t