Re: [PATCH 0/3] serial: 8250_pci patches to address issues with pericom_do_set_divisor()

On Sun, Nov 14, 2021 at 8:40 PM Jay Dolan [off-list ref] wrote:

A series patches to address three issues one customer managed to hit all at once.

1) Rewrite pericom_do_set_divisor() to always calc divisor and to use the
uartclk instead of a hard coded value. Always calculate divisor without passing
control to serial8250_do_set_divisor()
Tested with 14.7456 and 24 MHz crystals

2) Re-enable higher baud rates on Pericom chips.
serial8250_get_baud_rate() added range checking, but Pericom chips have a wider
range than what is being enforced. Make use of UPF_MAGIC_MULTIPLIER.
Tested with 14.7456 and 24 MHz crystals

3) Fourth port not being setup correctly on some Pericom chips.
Fix entries in pci_serial_quirks array

Can we start from splitting Pericom to its own file, please?

See my initial work here [1]. And I believe you may do a better job
than me since you have access to many variants of the hardware.

[1]: https://gitlab.com/andy-shev/next/-/commit/71fdb8b5d857691031f566daebb1e850b106f46a

(As a side note:
https://gitlab.com/andy-shev/next/-/commit/ac0dc993fa35b5e2fe67e967b6a687b2e47d0edd)

-- 
With Best Regards,
Andy Shevchenko