[BUG] mtk serial broken on mt7622 with 5.18.0

[Frank Wunderlich]

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 at collabora.com>
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 at collabora.com>
     Cc: stable <stable at vger.kernel.org>
     Link:
https://lore.kernel.org/r/20220427132328.228297-3-angelogioacchino.delregno@collabora.com
     Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>

  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@mail.gmail.com/#t