From mboxrd@z Thu Jan 1 00:00:00 1970 From: emilio@elopez.com.ar (=?UTF-8?B?RW1pbGlvIEzDs3Bleg==?=) Date: Tue, 03 Feb 2015 17:18:45 -0300 Subject: [linux-sunxi] Re: [PATCH v4] dma: sun4i: Add support for the DMA engine on sun[457]i SoCs In-Reply-To: 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> Message-ID: <54D12D25.5000408@elopez.com.ar> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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. Cheers, Emilio