linux-kernel - Re: [PATCH v6 7/7] ASoC: fsl_easrc: Add EASRC ASoC CPU DAI drivers

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Date:   Mon, 6 Apr 2020 17:29:18 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     timur@...nel.org, Xiubo.Lee@...il.com, festevam@...il.com,
        broonie@...nel.org, alsa-devel@...a-project.org,
        lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 7/7] ASoC: fsl_easrc: Add EASRC ASoC CPU DAI drivers

On Wed, Apr 01, 2020 at 04:45:40PM +0800, Shengjiu Wang wrote:
> EASRC (Enhanced Asynchronous Sample Rate Converter) is a new IP module
> found on i.MX8MN. It is different with old ASRC module.
> 
> The primary features for the EASRC are as follows:
> - 4 Contexts - groups of channels with an independent time base
> - Fully independent and concurrent context control
> - Simultaneous processing of up to 32 audio channels
> - Programmable filter charachteristics for each context
> - 32, 24, 20, and 16-bit fixed point audio sample support
> - 32-bit floating point audio sample support
> - 8kHz to 384kHz sample rate
> - 1/16 to 8x sample rate conversion ratio
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> Signed-off-by: Cosmin-Gabriel Samoila <cosmin.samoila@....com>

Overall, looks good to me.

Please add:
Acked-by: Nicolin Chen <nicoleotsuka@...il.com>

> diff --git a/sound/soc/fsl/fsl_easrc.c b/sound/soc/fsl/fsl_easrc.c
> +static int fsl_easrc_normalize_filter(struct fsl_asrc *easrc,

> +	 * If exponent is zero (value == 0), or 7ff (value == NaNs)
[...]
> +	if (exp == 0 || exp == 0x7ff) {
[...]
> +	if ((shift > 0 && exp >= 2047) ||
> +	    (shift < 0 && exp <= 0)) {

Could fit into one line, and would be probably nicer to re-use
"0x7ff" matching previous places, instead of "2047".