Re: [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.