From: emilio@elopez•com.ar (Emilio López)
To: linux-arm-kernel@lists•infradead.org
Subject: [linux-sunxi] Re: [PATCH v4] dma: sun4i: Add support for the DMA engine on sun[457]i SoCs
Date: Tue, 03 Feb 2015 19:47:15 -0300 [thread overview]
Message-ID: <54D14FF3.2030005@elopez.com.ar> (raw)
In-Reply-To: <54D12D25.5000408@elopez.com.ar>
El 03/02/15 a las 17:18, Emilio L?pez escibi?:
> Hi,
>
> El 03/02/15 a las 16:39, jonsmirl at gmail.com escibi?:
>> Did you fix multiple simultaneous DMA transfers in this? And easy test
>> is to start jack audio. Jack will start simultaneous cyclic transfers
>> on both the ALSA input and output. Since cyclic transfers never end,
>> multiple simultaneous transfers has to work. Last time I tried it I
>> got an immediate GPF when the second cyclic transfer was started.
>
> I didn't get a chance to test with jack yet, but I don't see any reason
> why two cyclic transfers wouldn't work, assuming they're on different
> vchans.
>
> Were you by any chance booting off of NAND by the way? That caused a GPF
> because the bootloader left the hardware in a dirty state, but it should
> be fixed now.
A quick followup on this; I tried jack and found a bug on the way
channels are terminated, it turns out sometimes IRQs can still trigger
after the termination. Once I fixed that, I was able to get jack to
produce a deafening tone with the following:
# jackd -dalsa --playback &
# jackdmp 1.9.10
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2014 Grame.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
creating alsa driver ... hw:0|-|1024|2|48000|0|0|nomon|swmeter|-|32bit
configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
ALSA: final selected sample format for playback: 32bit integer little-endian
ALSA: use 2 periods for playback
# jack_simple_client
next prev parent reply other threads:[~2015-02-03 22:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-31 22:58 [PATCH v4] DMAEngine support for sun4i, sun5i & sun7i Emilio López
2015-01-31 22:58 ` [PATCH v4] dma: sun4i: Add support for the DMA engine on sun[457]i SoCs Emilio López
2015-02-01 10:03 ` [linux-sunxi] " Priit Laes
2015-02-03 18:43 ` Emilio López
2015-02-03 19:39 ` [linux-sunxi] " jonsmirl at gmail.com
2015-02-03 20:18 ` Emilio López
2015-02-03 22:47 ` Emilio López [this message]
2015-02-04 3:12 ` Vinod Koul
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