From mboxrd@z Thu Jan 1 00:00:00 1970 From: emilio@elopez.com.ar (=?UTF-8?B?RW1pbGlvIEzDs3Bleg==?=) Date: Tue, 03 Feb 2015 19:47:15 -0300 Subject: [linux-sunxi] Re: [PATCH v4] dma: sun4i: Add support for the DMA engine on sun[457]i SoCs In-Reply-To: <54D12D25.5000408@elopez.com.ar> References: <1422745124-22103-1-git-send-email-emilio@elopez.com.ar> <1422745124-22103-2-git-send-email-emilio@elopez.com.ar> <1422785038.28275.34.camel@plaes.org> <54D116D4.3030004@elopez.com.ar> <54D12D25.5000408@elopez.com.ar> Message-ID: <54D14FF3.2030005@elopez.com.ar> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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