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From: Archimedes Gaviola <archimedes.gaviola@gmail.com>
Date: Sun, 13 Mar 2022 23:25:39 +0800
Message-ID: <CAJFbk7GZF4ahORzCUKaLZS4b=fCJQbEADPJmMYZjyaJwRR+hbw@mail.gmail.com>
Subject: Re: Raspberry Pi 3B USB Printing Issue
To: Hans Petter Selasky <hps@selasky.org>
Cc: freebsd-arm@freebsd.org
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On Sun, Mar 13, 2022 at 2:27 PM Archimedes Gaviola <
archimedes.gaviola@gmail.com> wrote:
>
>
> On Sun, Mar 13, 2022 at 12:38 AM Hans Petter Selasky <hps@selasky.org>
> wrote:
>
>> On 3/12/22 16:31, Archimedes Gaviola wrote:
>> >>
>> >> IOERROR usually means an electrical error. The RPI3B will use a
>> >> transaction translator for the FULL speed traffic, which is driven by
>> >> software.
>> >
>>
>> Hi Archimedes,
>>
>> > Hi Hans,
>> >
>> > I'm curious about the transaction translator you've mentioned, any idea
>> why
>> > there's a need for translation and what is being translated?
>>
>> When the High Speed USB HUB was invented, there was a need to support
>> FULL and LOW speed USB transactions. Because FULL and LOW speed
>> transactions are slow and take up much bandwidth, a transactions
>> translator was invented which translates between High Speed USB and
>> FULL/LOW speed USB. That means the RPi 3B consists of a single USB HIGH
>> speed port, followed by a USB HUB. These transactions are not visible in
>> usbdump .
>>
>> >Does this only
>> > happen when RPi 3B (acting as host controller) is transmitting data to
>> the
>> > Epson printer? Are translation events visible in the usbdump? In this
>> case
>> > there's a way to possibly track what's going on and how to identify any
>> > info that is being translated?
>>
>> By turning on the HC debugging, you can possibly track via debug
>> messages what is going on. Maybe it is a timing issue, that the SW is
>> too slow serving the micro transactions.
>>
>> Any idea also if translation is being
>> > performed in RPi 4B?
>>
>> The later RPi's do the transaction translator bits in HW or via the XHCI
>> block.
>>
>> As I have conducted several printing cases with my
>> > Epson printer without any issues with either of the 4 ports.
>> >
>> > Sorry for these questions as I am catching-up to the USB technology
>> > internal workings under the hood.
>>
>> You are welcome!
>>
>
>
> Thank you so much Hans for answering my questions, really appreciate it! I
> have a much better understanding now.
>
> I came from testing with 13.0-RELEASE having the same RPi 3B hardware and
> setup and it's very stable. I haven't encountered any IOERROR and
> incomplete printed outputs that were encountered with 14.0-CURRENT
> (February 24, 2022). By the way, I found in the repository here
> https://download.freebsd.org/snapshots/arm64/aarch64/ISO-IMAGES/14.0/
> that there were two latest snapshots released dated March 3 and March 10,
> respectively. I need to take printing tests first, especially the latest to
> check if it also manifests before I go back to the Feb. 24 snapshot and do
> a thorough test with debugging. I'll provide updates for any observations.
>
> Thanks,
> Archimedes
>
Hi Hans,
Initial testing conducted with the latest 14.0-CURRENT (March 10, 2022
snapshot) seems to be stable. Another test will be performed tomorrow.
Thanks,
Archimedes
--000000000000f0590405da1b2dbb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Sun, Mar 13, 2022 at 2:27 PM Archi=
medes Gaviola <<a href=3D"mailto:archimedes.gaviola@gmail.com">archimede=
s.gaviola@gmail.com</a>> wrote:<br></div><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div cla=
ss=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Mar 13, 20=
22 at 12:38 AM Hans Petter Selasky <<a href=3D"mailto:hps@selasky.org" t=
arget=3D"_blank">hps@selasky.org</a>> wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">On 3/12/22 16:31, Archimedes Gaviola wrote=
:<br>
>><br>
>> IOERROR usually means an electrical error. The RPI3B will use a<br=
>
>> transaction translator for the FULL speed traffic, which is driven=
by<br>
>> software.<br>
> <br>
<br>
Hi Archimedes,<br>
<br>
> Hi Hans,<br>
> <br>
> I'm curious about the transaction translator you've mentioned,=
any idea why<br>
> there's a need for translation and what is being translated? <br>
<br>
When the High Speed USB HUB was invented, there was a need to support <br>
FULL and LOW speed USB transactions. Because FULL and LOW speed <br>
transactions are slow and take up much bandwidth, a transactions <br>
translator was invented which translates between High Speed USB and <br>
FULL/LOW speed USB. That means the RPi 3B consists of a single USB HIGH <br=
>
speed port, followed by a USB HUB. These transactions are not visible in <b=
r>
usbdump .<br>
<br>
=C2=A0>Does this only<br>
> happen when RPi 3B (acting as host controller) is transmitting data to=
the<br>
> Epson printer? Are translation events visible in the usbdump? In this =
case<br>
> there's a way to possibly track what's going on and how to ide=
ntify any<br>
> info that is being translated? <br>
<br>
By turning on the HC debugging, you can possibly track via debug <br>
messages what is going on. Maybe it is a timing issue, that the SW is <br>
too slow serving the micro transactions.<br>
<br>
Any idea also if translation is being<br>
> performed in RPi 4B? <br>
<br>
The later RPi's do the transaction translator bits in HW or via the XHC=
I <br>
block.<br>
<br>
As I have conducted several printing cases with my<br>
> Epson printer without any issues with either of the 4 ports.<br>
> <br>
> Sorry for these questions as I am catching-up to the USB technology<br=
>
> internal workings under the hood.<br>
<br>
You are welcome!<br></blockquote><div><br></div><br></div><div class=3D"gma=
il_quote">Thank you so much Hans for answering my questions, really appreci=
ate it! I have a much better understanding now.<br></div><div class=3D"gmai=
l_quote"><br></div><div class=3D"gmail_quote">I came from testing with 13.0=
-RELEASE having the same RPi 3B hardware and setup and it's very stable=
. I haven't encountered any IOERROR and incomplete printed outputs that=
were encountered with 14.0-CURRENT (February 24, 2022). By the way, I foun=
d in the repository here <a href=3D"https://download.freebsd.org/snapshots/=
arm64/aarch64/ISO-IMAGES/14.0/" target=3D"_blank">https://download.freebsd.=
org/snapshots/arm64/aarch64/ISO-IMAGES/14.0/</a> that there were two latest=
snapshots released dated March 3 and March 10, respectively. I need to tak=
e printing tests first, especially the latest to check if it also manifests=
before I go back to the Feb. 24 snapshot and do a thorough test with debug=
ging. I'll provide updates for any observations.<br></div><div class=3D=
"gmail_quote"><br></div><div class=3D"gmail_quote"></div><div class=3D"gmai=
l_quote">Thanks,</div><div class=3D"gmail_quote">Archimedes<br></div></div>=
</blockquote><div><br></div><div><br></div><div>Hi Hans,</div><div><br></di=
v><div>Initial testing conducted with the latest 14.0-CURRENT (March 10, 20=
22 snapshot) seems to be stable. Another test will be performed tomorrow.<b=
r></div><div><br></div><div></div><div>Thanks,</div><div>Archimedes <br></d=
iv></div></div>
--000000000000f0590405da1b2dbb--