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Date:   Mon, 1 Feb 2021 19:02:51 -0500
From:   Eric Tremblay <etremblay@...tech-controls.com>
To:     Giulio Benetti <giulio.benetti@...ronovasrl.com>
Cc:     gregkh@...uxfoundation.org, jslaby@...e.com,
        andriy.shevchenko@...ux.intel.com, matwey.kornilov@...il.com,
        lukas@...ner.de, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        christoph.muellner@...obroma-systems.com, heiko@...ech.de,
        heiko.stuebner@...obroma-systems.com
Subject: Re: [PATCH 0/3] Handle UART without interrupt on TEMT using em485

On 2021-01-28 7:12 p.m., Giulio Benetti wrote:
> Hi Eric,
>
>> Il giorno 29 gen 2021, alle ore 00:37, Eric Tremblay <etremblay@...tech-controls.com> ha scritto:
>>
>> The series is mainly about the support of 8250 UART without TEMT
>> interrupt. I saw that there was some development in the past but
>> it was never merged. Since the last discussion were quite some
>> time ago, I was not sure if I should post a v4 over the
>> last v3 or start from scratch so I decided to post a new patch. Please
>> advice if I should have done the reverse.
> Please keep my and Heiko’s SoB and add your SoB too describing between [ ] what Heiko has done and what you’ve done. 
> For example:
> SoB: Giulio
> SoB: Heiko
> [Heiko: ...]
> SoB Eric
> [Eric: improved timeout etc.]

I will add them in the next version, thanks for mentioning it.

>
>> The approach is a little different from the last proposed patch which was
>> doing using a polling at 100us. I tought that it could be really long on 
>> some fast baudrate and really not that long on slow baudrate. The current
>> approach is to calculate the time of a bytes when the settings are changed.
>> When we get the interrupt for the empty FIFO, it's the longer it can take
>> to empty the shift register.
> Good idea.
>
>> The other two patches are to use that features with the PORT_16550A_FSL64
>> found on some chip like the LS1043A.
> Do you mind to add my 8250_dw patch that was originally part of this patchset? I had to send it
> soon, you’ve preceded me :-)

I think there was still a comment pending on that patch. I think you should resubmit
since I think it's a bit out-of-scope for me.

>
> Thank you
> Best regards
> Giulio
>
>> Thanks
>>
>> Eric Tremblay (3):
>> serial: 8250: Handle UART without interrupt on TEMT using em485
>> serial: 8250: add compatible for fsl,16550-FIFO64
>> serial: 8250: remove UART_CAP_TEMT on PORT_16550A_FSL64
>>
>> drivers/tty/serial/8250/8250.h            |  1 +
>> drivers/tty/serial/8250/8250_bcm2835aux.c |  2 +-
>> drivers/tty/serial/8250/8250_of.c         |  5 ++
>> drivers/tty/serial/8250/8250_omap.c       |  2 +-
>> drivers/tty/serial/8250/8250_port.c       | 89 ++++++++++++++++++++++-
>> include/linux/serial_8250.h               |  2 +
>> 6 files changed, 98 insertions(+), 3 deletions(-)
>>
>> -- 
>> 2.17.1


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