linux-kernel - RE: [PATCH 0/3] add channel constraint for BDW machine drivers

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Message-ID: <BN6PR1101MB2132DEC140145F90645BF2B997AF0@BN6PR1101MB2132.namprd11.prod.outlook.com>
Date:   Mon, 27 Apr 2020 15:10:32 +0000
From:   "Lu, Brent" <brent.lu@...el.com>
To:     "Rojewski, Cezary" <cezary.rojewski@...el.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
CC:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        "Mark Brown" <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Ben Zhang <benzh@...omium.org>,
        "Chiang, Mac" <mac.chiang@...el.com>,
        Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/3] add channel constraint for BDW machine drivers

> >
> > Apart from review given for each and every patch (although most issues
> > are shared so there is not as much to address) my question is:
> > - are these hw limitations or software (machine board) limitations?

The limitation comes from board. Bdw-rt5677 and Broadwell are using I2S with
2 microphones while Bdw-rt5650 is using PCM TDM with 4 microphones. Our
DSP supports stereo playback and 2 or 4-channel capture (haswell/sst-haswell-pcm.c).


> >
> > Czarek
> >
> >> Brent Lu (3):
> >>    ASoC: bdw-rt5677: channel constraint support
> >>    ASoC: bdw-rt5650: channel constraint support
> >>    ASoC: broadwell: channel constraint support
> >>
> >>   sound/soc/intel/boards/bdw-rt5650.c | 34
> >> ++++++++++++++++++++++++++++++++++
> >>   sound/soc/intel/boards/bdw-rt5677.c | 33
> >> +++++++++++++++++++++++++++++++++
> >>   sound/soc/intel/boards/broadwell.c  | 33
> >> +++++++++++++++++++++++++++++++++
> >>   3 files changed, 100 insertions(+)
> >>