linux-kernel - Re: [PATCH] ASoC: fsl_asrc: Add an option to select internal ratio mode

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Message-ID: <CAA+D8AO5iGZjJ8MHhG=zfyu+N5JO0PnvcHYY+3BEY0Lz5xyxKg@mail.gmail.com>
Date:   Tue, 30 Jun 2020 21:30:55 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Mark Brown <broonie@...nel.org>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] ASoC: fsl_asrc: Add an option to select internal ratio mode

On Tue, Jun 30, 2020 at 8:38 PM Fabio Estevam <festevam@...il.com> wrote:
>
> Hi Shengjiu,
>
> On Mon, Jun 29, 2020 at 11:10 AM Shengjiu Wang <shengjiu.wang@....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.

ok, will update the patch

best regards
wang shengjiu