linux-kernel - Re: [PATCH v3 03/10] ASoC: tegra: add Tegra210 based DMIC driver

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Message-ID: <20200221130005.GD5546@sirena.org.uk>
Date:   Fri, 21 Feb 2020 13:00:05 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Sameer Pujar <spujar@...dia.com>
Cc:     perex@...ex.cz, tiwai@...e.com, robh+dt@...nel.org,
        lgirdwood@...il.com, thierry.reding@...il.com,
        jonathanh@...dia.com, digetx@...il.com,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        sharadg@...dia.com, mkumard@...dia.com, viswanathl@...dia.com,
        rlokhande@...dia.com, dramesh@...dia.com, atalambedu@...dia.com
Subject: Re: [PATCH v3 03/10] ASoC: tegra: add Tegra210 based DMIC driver

On Thu, Feb 20, 2020 at 12:04:45PM +0530, Sameer Pujar wrote:

> +++ b/sound/soc/tegra/tegra210_dmic.c
> @@ -0,0 +1,515 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * tegra210_dmic.c - Tegra210 DMIC driver
> + *
> + * Copyright (c) 2020 NVIDIA CORPORATION.  All rights reserved.

Please make the entire comment a C++ one so things look more
intentional.

> +	/* Below enables all filters - DCR, LP and SC */
> +	{ TEGRA210_DMIC_DBG_CTRL, 0xe },

So this isn't the hardware default?

> +	srate = params_rate(params);
> +	if (dmic->srate_override)
> +		srate = dmic->srate_override;

How does this work for userspace?  If we just ignore the sample rate we
were asked for I'd expect that the application would get upset.

> +	if (strstr(kcontrol->id.name, "Boost Gain"))
> +		dmic->boost_gain = value;

Volume controls should end in "Volume".

> +	else if (strstr(kcontrol->id.name, "Audio Channels"))
> +		dmic->audio_ch_override = value;

This is something that would usually come from hw_params?

> +	else if (strstr(kcontrol->id.name, "LR Polarity Select"))
> +		dmic->lrsel = value;

This and some of the others look like they're describing details of how
the board is wired up so I'd not expect them to be runtime selectable?

> +	SND_SOC_DAPM_MIC("Dummy Input", NULL),

This is just the microphone that happens to be attached, isn't it?  If
so that's a weird name.

> +static const char * const tegra210_dmic_mono_conv_text[] = {
> +	"ZERO", "COPY",
> +};

It'd be more idiomatic for ALSA to write these as Zero and Copy.

> +	SOC_ENUM_EXT("Channel Select", tegra210_dmic_ch_enum,
> +		     tegra210_dmic_get_control, tegra210_dmic_put_control),
> +	SOC_ENUM_EXT("Mono To Stereo",
> +		     tegra210_dmic_mono_conv_enum, tegra210_dmic_get_control,
> +		     tegra210_dmic_put_control),
> +	SOC_ENUM_EXT("Stereo To Mono",
> +		     tegra210_dmic_stereo_conv_enum, tegra210_dmic_get_control,
> +		     tegra210_dmic_put_control),

I'd expect these to be in DAPM.

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