linux-kernel - Re: [PATCH v1 0/2] serial: 8250

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Date:   Sat, 20 Nov 2021 13:05:51 -0800
From:   Jay Dolan <jay.dolan@...esio.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        Jiri Slaby <jirislaby@...nel.org>
Subject: Re: [PATCH v1 0/2] serial: 8250_pci: Split Pericom driver



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@linux.intel.com/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.