linux-kernel - Re: [RFC PATCH v2 1/7] ASoC: fsl_asrc: define functions for memory to memory usage

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Date:   Tue, 1 Aug 2023 16:58:24 +0300
From:   Daniel Baluta <daniel.baluta@...il.com>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     hverkuil@...all.nl, sakari.ailus@....fi, tfiga@...omium.org,
        m.szyprowski@...sung.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        shengjiu.wang@...il.com, Xiubo.Lee@...il.com, festevam@...il.com,
        nicoleotsuka@...il.com, lgirdwood@...il.com, broonie@...nel.org,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH v2 1/7] ASoC: fsl_asrc: define functions for memory to
 memory usage

> +static int fsl_asrc_m2m_check_format(u8 dir, u32 rate, u32 channels, u32 format)
> +{
> +       u64 support_format = FSL_ASRC_FORMATS;
> +
> +       if (channels < 1 || channels > 10)
> +               return -EINVAL;
> +
> +       if (rate < 5512 || rate > 192000)
> +               return -EINVAL;
> +

I think we can avoid using magic numbers. Instead we could do:

#define FSL_ASRC_MIN_CHANNELS 1
/...
#define FSL_ASRC_MAX_RATE 192000


> +       if (dir == IN)
> +               support_format |= SNDRV_PCM_FMTBIT_S8;
> +
> +       if (!(1 << format & support_format))
> +               return -EINVAL;
> +
> +       return 0;
> +}
> +
> +/* calculate capture data length according to output data length and sample rate */
> +static int fsl_asrc_m2m_calc_out_len(struct fsl_asrc_pair *pair, int input_buffer_length)
> +{
> +       unsigned int in_width, out_width;
> +       unsigned int channels = pair->channels;
> +       unsigned int in_samples, out_samples;
> +       unsigned int out_length;
> +
> +       in_width = snd_pcm_format_physical_width(pair->sample_format[IN]) / 8;
> +       out_width = snd_pcm_format_physical_width(pair->sample_format[OUT]) / 8;
> +
> +       in_samples = input_buffer_length / in_width / channels;
> +       out_samples = pair->rate[OUT] * in_samples / pair->rate[IN];
> +       out_length = (out_samples - ASRC_OUTPUT_LAST_SAMPLE) * out_width * channels;
> +
> +       return out_length;
> +}
> +
> +static int fsl_asrc_m2m_get_maxburst(u8 dir, struct fsl_asrc_pair *pair)
> +{
> +       struct fsl_asrc *asrc = pair->asrc;
> +       struct fsl_asrc_priv *asrc_priv = asrc->private;
> +       int wml = (dir == IN) ? ASRC_M2M_INPUTFIFO_WML : ASRC_M2M_OUTPUTFIFO_WML;
> +
> +       if (!asrc_priv->soc->use_edma)
> +               return wml * pair->channels;
> +       else
> +               return 1;
> +}
> +
> +static int fsl_asrc_m2m_pair_resume(struct fsl_asrc_pair *pair)
> +{
> +       struct fsl_asrc *asrc = pair->asrc;
> +       int i;
> +
> +       for (i = 0; i < pair->channels * 4; i++)
> +               regmap_write(asrc->regmap, REG_ASRDI(pair->index), 0);
> +
> +       return 0;
> +}
> +
>  static int fsl_asrc_runtime_resume(struct device *dev);
>  static int fsl_asrc_runtime_suspend(struct device *dev);

<snip>

There is no implementation for _suspend although you mention it
in the commit message.

> + * @complete: dma task complete
> + * @sample_format: format of m2m
> + * @rate: rate of m2m
> + * @buf_len: buffer length of m2m
> + * @req_pair: flag for request pair


For example @complete field is not used in this patch. Maybe add it in the patch
that uses it?

I think is the same for other fields.