Hi,
Thanks for your patch.
FYI: kernel test robot notices the stable kernel rule is not satisfied.
Rule: 'Cc: stable@vger.kernel.org' or 'commit <sha1> upstream.' Subject: [PATCH v4] serial: 8250_dw: Preserve original value of DLF register Link: https://lore.kernel.org/stable/20230713004235.35904-1-colorsu1922%40gmail.co...
The check is based on https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html