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SubjectRe: [PATCH] ASoC: fsl_asrc: Add an option to select internal ratio mode
Hi Shengjiu,

On Mon, Jun 29, 2020 at 11:10 AM Shengjiu Wang <shengjiu.wang@nxp.com> wrote:

> +/**

"/**" notation may confuse 'make htmldocs". Since this is a single
line comment you could do:

/* Select proper clock source for internal ratio mode */


> + * Select proper clock source for internal ratio mode
> + */
> +static int fsl_asrc_select_clk(struct fsl_asrc_priv *asrc_priv,
> + struct fsl_asrc_pair *pair,
> + int in_rate,
> + int out_rate)
> +{
> + struct fsl_asrc_pair_priv *pair_priv = pair->private;
> + struct asrc_config *config = pair_priv->config;
> + int rate[2], select_clk[2]; /* Array size 2 means IN and OUT */
> + int clk_rate, clk_index;
> + int i = 0, j = 0;
> + bool clk_sel[2];
> +
> + rate[0] = in_rate;
> + rate[1] = out_rate;
> +
> + /* Select proper clock source for internal ratio mode */
> + for (j = 0; j < 2; j++) {
> + for (i = 0; i < ASRC_CLK_MAP_LEN; i++) {
> + clk_index = asrc_priv->clk_map[j][i];
> + clk_rate = clk_get_rate(asrc_priv->asrck_clk[clk_index]);
> + if (clk_rate != 0 && (clk_rate / rate[j]) <= 1024 &&
> + (clk_rate % rate[j]) == 0)
> + break;
> + }
> +
> + if (i == ASRC_CLK_MAP_LEN) {
> + select_clk[j] = OUTCLK_ASRCK1_CLK;
> + clk_sel[j] = false;
> + } else {
> + select_clk[j] = i;
> + clk_sel[j] = true;
> + }
> + }
> +
> + /* Switch to ideal ratio mode if there is no proper clock source */
> + if (!clk_sel[IN] || !clk_sel[OUT])
> + select_clk[IN] = INCLK_NONE;
> +
> + config->inclk = select_clk[IN];
> + config->outclk = select_clk[OUT];
> +
> + return 0;

This new function always returns 0. Should it be converted to 'void'
type instead?

> + ret = fsl_asrc_select_clk(asrc_priv, pair,
> + config.input_sample_rate,
> + config.output_sample_rate);
> + if (ret) {
> + dev_err(dai->dev, "fail to select clock\n");

fsl_asrc_select_clk() does not return error, so you could skip the
error checking.

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