linux-kernel - Re: [PATCH v3 2/2] ASoC: Intel: Add period size constraint on strago board

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Message-ID: <63bca214-3434-16c6-1b60-adf323aec554@linux.intel.com>
Date:   Mon, 3 Aug 2020 10:13:39 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     "Lu, Brent" <brent.lu@...el.com>, Takashi Iwai <tiwai@...e.de>
Cc:     Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        "Rojewski, Cezary" <cezary.rojewski@...el.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Sam McNally <sammc@...omium.org>,
        Mark Brown <broonie@...nel.org>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Daniel Stuart <daniel.stuart14@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Yu-Hsuan Hsu <yuhsuan@...omium.org>,
        Damian van Soelen <dj.vsoelen@...il.com>
Subject: Re: [PATCH v3 2/2] ASoC: Intel: Add period size constraint on strago
 board



On 8/3/20 8:00 AM, Lu, Brent wrote:
>>>>
>>>> Again, is this fixed 240 is a must?  Or is this also an alignment issue?
>>> Hi Takashi,
>>>
>>> I think it's a must for Chromebooks. Google found this value works
>>> best with their CRAS server running on their BSW products. They
>>> offered this patch for their own Chromebooks.
>>
>> Hrm, but it's likely a worse choice on other sound backends.
>>
>> Please double-check whether this fixed small period is a must, or it's an
>> alignment issue.
> Hi Takashi,
> 
> I've double checked with google. It's a must for Chromebooks due to low
> latency use case.

I wonder if there's a misunderstanding here?

I believe Takashi's question was "is this a must to ONLY accept 240 
samples for the period size", there was no pushback on the value itself. 
Are those boards broken with e.g. 960 samples?