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

From Caleb Crome <caleb@crome.org>
Newsgroups linux.kernel
Subject Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst settings device tree options
Date 2016-01-15 06:00 +0100
Message-ID <qR4Eq-Xf-5@gated-at.bofh.it> (permalink)
References <qQSWE-197-63@gated-at.bofh.it> <qQWxc-3FW-17@gated-at.bofh.it> <qQXCX-4lN-15@gated-at.bofh.it> <qR2CB-81R-1@gated-at.bofh.it>
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On Thu, Jan 14, 2016 at 6:45 PM, Nicolin Chen <nicoleotsuka@gmail.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

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[PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst settings device tree options Caleb Crome <caleb@crome.org> - 2016-01-14 17:30 +0100
  Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Nicolin Chen <nicoleotsuka@gmail.com> - 2016-01-14 21:20 +0100
    Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Caleb Crome <caleb@crome.org> - 2016-01-14 22:30 +0100
      Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Nicolin Chen <nicoleotsuka@gmail.com> - 2016-01-15 03:50 +0100
        Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Caleb Crome <caleb@crome.org> - 2016-01-15 06:00 +0100
          Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Nicolin Chen <nicoleotsuka@gmail.com> - 2016-01-15 19:20 +0100
    Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Timur Tabi <timur@tabi.org> - 2016-01-15 02:40 +0100
      Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Nicolin Chen <nicoleotsuka@gmail.com> - 2016-01-15 03:40 +0100
      Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Rob Herring <robh@kernel.org> - 2016-01-15 04:30 +0100
      Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Mark Brown <broonie@kernel.org> - 2016-01-15 14:20 +0100
        Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Timur Tabi <timur@tabi.org> - 2016-01-15 14:50 +0100
          Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Caleb Crome <caleb@crome.org> - 2016-01-15 18:10 +0100
            Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Nicolin Chen <nicoleotsuka@gmail.com> - 2016-01-15 19:40 +0100
              Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Caleb Crome <caleb@crome.org> - 2016-01-15 19:50 +0100
                Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Nicolin Chen <nicoleotsuka@gmail.com> - 2016-01-15 20:00 +0100
                Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Caleb Crome <caleb@crome.org> - 2016-01-15 20:20 +0100
                Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Nicolin Chen <nicoleotsuka@gmail.com> - 2016-01-15 20:30 +0100
                Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Timur Tabi <timur@tabi.org> - 2016-01-15 20:50 +0100
                Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Timur Tabi <timur@tabi.org> - 2016-01-16 15:20 +0100
                Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Caleb Crome <caleb@crome.org> - 2016-01-18 00:40 +0100
              Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst  settings device tree options Timur Tabi <timur@tabi.org> - 2016-01-15 21:00 +0100

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