linux-kernel - Re: [PATCH v3] ASoC: Intel: kbl_rt5663_rt5514_max98927: Split be_hw_params

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Date:   Wed, 1 Jul 2020 11:48:16 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     "N, Harshapriya" <harshapriya.n@...el.com>,
        Łukasz Majczak <lma@...ihalf.com>
Cc:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Radoslaw Biernacki <rad@...ihalf.com>,
        Ross Zwisler <zwisler@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        "M R, Sathya Prakash" <sathya.prakash.m.r@...el.com>,
        Bob Brandt <brndt@...gle.com>, Marcin Wojtas <mw@...ihalf.com>,
        Alex Levin <levinale@...omium.org>
Subject: Re: [PATCH v3] ASoC: Intel: kbl_rt5663_rt5514_max98927: Split
 be_hw_params_fixup function



On 7/1/20 11:37 AM, N, Harshapriya wrote:
>>
>>>> For speakers and headsets its 48Khz, 2 ch and 24 bit and this
>>>> setting is done based on the front-end dai For speakers, however
>>>> support only
>>>> 16 bit, so we set it back to 16 bit If the front end dai is dmic,
>>>> then the channel
>>> is set to either 2 or 4 dmic_constraints. No other formats need to be set.
>>>>
>>>> All the SSP1 usages do not have the same parameters (as dmic is on
>>>> SSP1 and its different as given above) Most parameters are same for
>>> speakers and headset which are on different SSP. This is the reason we
>>> had a single fixup function.
>> On SSP1, for dmic we need to fix the channels which is derived from dmic_num
>> of the snd_soc_acpi_mach structure based on the number of dmic on the
>> board.
>> The channel is something that might be different from speakers.
>> We might not want to constraint the dmic capture to always be 48Khz as well.
>> Given this, there seems to me, 2 ways to set it:
>> 1. Derive if the fixup is being called for dmic or speaker 2. Having a new dailink
>>
>> If #2 is not preferred (going by Pierre's comments), can we use rtd-
>>> cpu_dai/codec_dai->name to figure out if its for dmic or speaker?
>> I can test this and get back to you.
> Tested and the following is something we can use without creating a new dailink.
>         	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
> 	if (!strcmp(codec_dai->name, KBL_REALTEK_DMIC_CODEC_DAI)) {
> 		if (params_channels(params) == 2 ||  DMIC_CH(dmic_constraints) == 2)
> 			channels->min = channels->max = 2;
> 		else
> 			channels->min = channels->max = 4;
> 	} else {
> 		rate->min = rate->max = 48000;
> 		channels->min = channels->max = 2;
> 		snd_mask_none(fmt);
> 		snd_mask_set_format(fmt, pcm_fmt);
> 	}
> 
> Pierre, thoughts?

thanks Harsha, that looks like what I had in mind, but my earlier 
question was why we deal with the rates and formats only in the last case?