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

[Damien Horsley]

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.