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Message-ID: <56313B9C.8030502@imgtec.com> Date: Wed, 28 Oct 2015 21:18:20 +0000 From: Damien Horsley <Damien.Horsley@...tec.com> To: Mark Brown <broonie@...nel.org> CC: <alsa-devel@...a-project.org>, James Hartley <James.Hartley@...tec.com>, Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>, Mark Rutland <mark.rutland@....com>, Ian Campbell <ijc+devicetree@...lion.org.uk>, Kumar Gala <galak@...eaurora.org>, Liam Girdwood <lgirdwood@...il.com>, Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: Re: [alsa-devel] [PATCH V2 02/10] ASoC: img: Add driver for I2S input controller On 28/10/15 01:04, Mark Brown wrote: > On Tue, Oct 27, 2015 at 01:55:27PM +0000, Damien Horsley wrote: >> On 23/10/15 23:57, Mark Brown wrote: > >>> Shouldn't we be doing that flush on stream close instead? If nothing >>> else the flush is going to discard a bit of data if the stream is just >>> paused. > >> The FIFOs are only 8 frames in size, so I am not sure there is an >> issue with these frames being lost. > >> I think it also makes sense to keep the blocks consistent with each >> other. The spdif (out and in), and parallel out, all flush automatically >> when stopped, and the fifo for the i2s out block is cleared when the >> reset is asserted. > > This seems like an issue that got missed in the other drivers then. I'd > expect the trigger operation to be a minimal operation which starts and > stops the data transfer, not doing anything else. > The spdif out, spdif in, and parallel out blocks auto-flush whenever they are stopped. It is not possible for software to prevent this behavior. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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