linux-kernel - Re: [alsa-devel] [PATCH V2 02/10] ASoC: img: Add driver for I2S input controller

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Message-ID: <20151028010443.GX28319@sirena.org.uk>
Date:	Wed, 28 Oct 2015 10:04:43 +0900
From:	Mark Brown <broonie@...nel.org>
To:	Damien Horsley <Damien.Horsley@...tec.com>
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 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.

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