linux-kernel - RE: [PATCH v2 0/2] Add period size constraint for Atom Chromebook

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Date:   Thu, 30 Jul 2020 15:25:47 +0000
From:   "Lu, Brent" <brent.lu@...el.com>
To:     Takashi Iwai <tiwai@...e.de>
CC:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "Guennadi Liakhovetski" <guennadi.liakhovetski@...ux.intel.com>,
        "Rojewski, Cezary" <cezary.rojewski@...el.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.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>,
        Yu-Hsuan Hsu <yuhsuan@...omium.org>,
        Daniel Stuart <daniel.stuart14@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Damian van Soelen <dj.vsoelen@...il.com>
Subject: RE: [PATCH v2 0/2] Add period size constraint for Atom Chromebook

> >
> > Two different constraints are implemented: one is in platform's CPU
> > DAI to enforce period sizes which are already used in Android BSP. The
> > other is in Atom Chromebook's machine driver to use 240 as period size.
> >
> > Changes since v1:
> > -Add comma at the end of media_period_size array declaration.
> 
> Is it a hardware restriction?  Unless it's a must for some hardware issues,
> enforcing such a small period size is nothing but a drawback for a system
> without CRAS.

Hi Takashi,

This patch is cherry-picked from Chrome's branch which is originally implemented
by google. They found this value works best with CRAS and these two machine
drivers are for Chromebooks. Other BSW machine drivers are untouched.


Regards,
Brent

> 
> 
> thanks,
> 
> Takashi
> 
> >
> > Brent Lu (1):
> >   ASoC: intel: atom: Add period size constraint
> >
> > Yu-Hsuan Hsu (1):
> >   ASoC: Intel: Add period size constraint on strago board
> >
> >  sound/soc/intel/atom/sst-mfld-platform-pcm.c | 15 +++++++++++++++
> > sound/soc/intel/boards/cht_bsw_max98090_ti.c | 14 +++++++++++++-
> >  sound/soc/intel/boards/cht_bsw_rt5645.c      | 14 +++++++++++++-
> >  3 files changed, 41 insertions(+), 2 deletions(-)
> >
> > --
> > 2.7.4
> >