Re: [PATCH v1 0/2] serial: 8250_pci: Split Pericom driver

[Jay Dolan]

On 11/19/21 6:33 AM, Jay Dolan wrote:
> On 11/19/21 12:23 AM, Andy Shevchenko wrote:
> > On Thu, Nov 18, 2021 at 10:32:51PM -0800, Jay Dolan wrote:
> > > On 11/17/21 6:57 AM, Andy Shevchenko wrote:
> > > > Split Pericom driver to a separate module.
> > > > While at it, re-enable high baud rates.
> > > >
> > > > Jay, can you, please, test this on as many hardware as you have?
> > > >
> > > > The series depends on the fix-series: 
> > > > https://lore.kernel.org/linux-serial/20211117145502.43645-1-andriy.shevchenko@xxxxxxxxxxxxxxx/T/#u 
> >
> > > I have my current state here: 
> > > https://github.com/accesio/linux/blob/split-pericom-driver/drivers/tty/serial/8250/8250_pericom.c 
> > >
> > >
> > > * Change port type to UPIO_PORT
> > > * Add in pericom_do_startup() because the UPF_MAGIC_MULTIPLIER doesn't
> > > stick.
> >
> > Thanks, I have updated my local tree with these changes.
> >
> > > When I'm testing baud rates greater than baud_base I'm seeing strange 
> > > things
> > > on the scope.
> >
> > Can you confirm that there are no issues with the first (fixes) series?
> Yes. The fixes series has no issues, and was tested up to baud_base for 
> both 14 and 24 MHz crystals.
> > I have slightly changed your set_divisor() refactoring, it may be that 
> > issue
> > is there.
> >
> > > Maybe I'm just tired, and it's human error. I should be able
> > > to get back to it and get it done on Saturday.
> >
> > Thank you.

Latest code is still here 
https://github.com/accesio/linux/blob/split-pericom-driver/drivers/tty/serial/8250/8250_pericom.c

Changes from last update:
* Avoid divide by zero when initializing delta

I retested and verified on the scope that speeds are now being set 
correctly.

I have also confirmed that all of the ACCES four port cards in the 
driver do have the offset fourth port. The item I raised about PCI was a 
misunderstanding that was all on my end.

Are there any other action items I should be handling?

Thank you for your work so far.