linux-kernel - Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst settings device tree options

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Message-ID: <CAG5mAdyH1FOYCxYM14fknnRmaSBERMLx_k_D+RCUMiSjWMRvBA@mail.gmail.com>
Date:	Thu, 14 Jan 2016 20:56:31 -0800
From:	Caleb Crome <caleb@...me.org>
To:	Nicolin Chen <nicoleotsuka@...il.com>
Cc:	Timur Tabi <timur@...i.org>, Xiubo Li <Xiubo.Lee@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
Subject: Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst
 settings device tree options

On Thu, Jan 14, 2016 at 6:45 PM, Nicolin Chen <nicoleotsuka@...il.com> wrote:
> On Thu, Jan 14, 2016 at 01:26:24PM -0800, Caleb Crome wrote:
>
>> As for optimal settings, I finally came to a setting of 4 for depth &
>> maxburst, which will result in more DMA requests, but it's the only
>> way that works at 48kHz for me.  The default settings is 13 (15 - 2)
>> for the ones of the 15 item fifo, which is a pretty dramatic
>> difference.  I just don't know if other chips will behave badly in
>> that case.
>
> What's your final configuration for TFWM0 bits, 4?

Yes, a value of 4 for my use case:  i.MX6 @ 768000 words/second (48khz
* 16 channels).

Also, works at 8kHz, 16kHz 32 kHz.

A setting of 8 does not work reliably at 48kHz but does work at 8, 16 and 32.

-caleb