linux-kernel - Re: [PATCH v3 02/10] ASoC: tegra: add support for CIF programming

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Message-ID: <f930e81b-3635-3b4d-8613-6e8b43e2efaf@nvidia.com>
Date:   Thu, 20 Feb 2020 14:30:55 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Sameer Pujar <spujar@...dia.com>, <perex@...ex.cz>,
        <tiwai@...e.com>, <robh+dt@...nel.org>
CC:     <broonie@...nel.org>, <lgirdwood@...il.com>,
        <thierry.reding@...il.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 02/10] ASoC: tegra: add support for CIF programming


On 20/02/2020 06:34, Sameer Pujar wrote:
> Audio Client Interface (CIF) is a proprietary interface employed to route
> audio samples through Audio Hub (AHUB) components by inter connecting the
> various modules.
> 
> This patch exports an inline function tegra_set_cif() which can be used,
> for now, to program CIF on Tegra210 and later Tegra generations. Later it
> can be extended to include helpers for legacy chips as well.
> 
> Signed-off-by: Sameer Pujar <spujar@...dia.com>
> ---
>  sound/soc/tegra/tegra_cif.h | 63 +++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 63 insertions(+)
>  create mode 100644 sound/soc/tegra/tegra_cif.h
> 
> diff --git a/sound/soc/tegra/tegra_cif.h b/sound/soc/tegra/tegra_cif.h
> new file mode 100644
> index 0000000..ecc0850
> --- /dev/null
> +++ b/sound/soc/tegra/tegra_cif.h
> @@ -0,0 +1,63 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * tegra_cif.h - TEGRA Audio CIF Programming
> + *
> + * Copyright (c) 2020 NVIDIA CORPORATION.  All rights reserved.
> + *
> + */
> +
> +#ifndef __TEGRA_CIF_H__
> +#define __TEGRA_CIF_H__
> +
> +#define TEGRA_ACIF_CTRL_FIFO_TH_SHIFT		24
> +#define TEGRA_ACIF_CTRL_AUDIO_CH_SHIFT		20
> +#define TEGRA_ACIF_CTRL_CLIENT_CH_SHIFT		16
> +#define TEGRA_ACIF_CTRL_AUDIO_BITS_SHIFT	12
> +#define TEGRA_ACIF_CTRL_CLIENT_BITS_SHIFT	8
> +#define TEGRA_ACIF_CTRL_EXPAND_SHIFT		6
> +#define TEGRA_ACIF_CTRL_STEREO_CONV_SHIFT	4
> +#define TEGRA_ACIF_CTRL_REPLICATE_SHIFT		3
> +#define TEGRA_ACIF_CTRL_TRUNCATE_SHIFT		1
> +#define TEGRA_ACIF_CTRL_MONO_CONV_SHIFT		0
> +
> +/* AUDIO/CLIENT_BITS values */
> +#define TEGRA_ACIF_BITS_8			1
> +#define TEGRA_ACIF_BITS_16			3
> +#define TEGRA_ACIF_BITS_24			5
> +#define TEGRA_ACIF_BITS_32			7
> +
> +#define TEGRA_ACIF_UPDATE_MASK			0x3ffffffb
> +
> +struct tegra_cif_conf {
> +	unsigned int threshold;
> +	unsigned int audio_ch;
> +	unsigned int client_ch;
> +	unsigned int audio_bits;
> +	unsigned int client_bits;
> +	unsigned int expand;
> +	unsigned int stereo_conv;
> +	unsigned int replicate;
> +	unsigned int truncate;
> +	unsigned int mono_conv;
> +};
> +
> +static inline void tegra_set_cif(struct regmap *regmap, unsigned int reg,
> +				 struct tegra_cif_conf *conf)
> +{
> +	unsigned int value;
> +
> +	value = (conf->threshold << TEGRA_ACIF_CTRL_FIFO_TH_SHIFT) |
> +		((conf->audio_ch - 1) << TEGRA_ACIF_CTRL_AUDIO_CH_SHIFT) |
> +		((conf->client_ch - 1) << TEGRA_ACIF_CTRL_CLIENT_CH_SHIFT) |
> +		(conf->audio_bits << TEGRA_ACIF_CTRL_AUDIO_BITS_SHIFT) |
> +		(conf->client_bits << TEGRA_ACIF_CTRL_CLIENT_BITS_SHIFT) |
> +		(conf->expand << TEGRA_ACIF_CTRL_EXPAND_SHIFT) |
> +		(conf->stereo_conv << TEGRA_ACIF_CTRL_STEREO_CONV_SHIFT) |
> +		(conf->replicate << TEGRA_ACIF_CTRL_REPLICATE_SHIFT) |
> +		(conf->truncate << TEGRA_ACIF_CTRL_TRUNCATE_SHIFT) |
> +		(conf->mono_conv << TEGRA_ACIF_CTRL_MONO_CONV_SHIFT);
> +
> +	regmap_update_bits(regmap, reg, TEGRA_ACIF_UPDATE_MASK, value);
> +}
> +
> +#endif

Reviewed-by: Jon Hunter <jonathanh@...dia.com>

Cheers!
Jon

-- 
nvpublic