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

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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.
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