linux-kernel - Re: [very-RFC 0/8] TSN driver for the kernel

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Message-ID: <20160615075002.GA5070@sisyphus.home.austad.us>
Date:	Wed, 15 Jun 2016 09:50:02 +0200
From:	Henrik Austad <henrik@...tad.us>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	alsa-devel@...r.kernel.org, netdev@...r.kernel.org,
	Arnd Bergmann <arnd@...aro.org>
Subject: Re: [very-RFC 0/8] TSN driver for the kernel

On Wed, Jun 15, 2016 at 09:04:41AM +0200, Richard Cochran wrote:
> On Tue, Jun 14, 2016 at 10:38:10PM +0200, Henrik Austad wrote:
> > Whereas I want to do 
> > 
> > aplay some_song.wav
> 
> Can you please explain how your patches accomplish this?

In short:

modprobe tsn
modprobe avb_alsa
mkdir /sys/kernel/config/eth0/link
cd /sys/kernel/config/eth0/link
<set approriate values vor the attributes>
echo alsa > enabled
aplay -Ddefault:CARD=avb some_song.wav

Likewise on the receiver side, except add 'Listener' to end_station 
attribute

arecord -c2 -r48000 -f S16_LE -Ddefault:CARD=avb > some_recording.wav

I've not had time to fully fix the hw-aprams for alsa, so some manual 
tweaking of arecord is required.


Again, this is a very early attempt to get something useful done with TSN, 
I know there are rough edges, I know buffer handling and timestamping is 
not finished


Note: if you don't have an intel-card, load tsn in debug-mode and it will 
let you use all NICs present.

modprobe tsn in_debug=1


-- 
Henrik Austad

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