linux-kernel - Re: [PATCH 2/2] ASoC: fsl_aud2htx: Add aud2htx module driver

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Date:   Tue, 27 Oct 2020 21:17:17 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, alsa-devel@...a-project.org,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, Takashi Iwai <tiwai@...e.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ASoC: fsl_aud2htx: Add aud2htx module driver

On Mon, Oct 26, 2020 at 9:31 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Mon, Oct 26, 2020 at 06:40:55PM +0800, Shengjiu Wang wrote:
>
> > +static int fsl_aud2htx_hw_params(struct snd_pcm_substream *substream,
> > +                              struct snd_pcm_hw_params *params,
> > +                              struct snd_soc_dai *cpu_dai)
> > +{
> > +     struct fsl_aud2htx *aud2htx = snd_soc_dai_get_drvdata(cpu_dai);
> > +
> > +     /* DMA request when number of entries < WTMK_LOW */
> > +     regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
> > +                        AUD2HTX_CTRE_DT_MASK, 0);
> > +
> > +     /* Disable interrupts*/
> > +     regmap_update_bits(aud2htx->regmap, AUD2HTX_IRQ_MASK,
> > +                        AUD2HTX_WM_HIGH_IRQ_MASK |
> > +                        AUD2HTX_WM_LOW_IRQ_MASK |
> > +                        AUD2HTX_OVF_MASK,
> > +                        AUD2HTX_WM_HIGH_IRQ_MASK |
> > +                        AUD2HTX_WM_LOW_IRQ_MASK |
> > +                        AUD2HTX_OVF_MASK);
> > +
> > +     /* Configur watermark */
> > +     regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
> > +                        AUD2HTX_CTRE_WL_MASK,
> > +                        AUD2HTX_WTMK_LOW << AUD2HTX_CTRE_WL_SHIFT);
> > +     regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
> > +                        AUD2HTX_CTRE_WH_MASK,
> > +                        AUD2HTX_WTMK_HIGH << AUD2HTX_CTRE_WH_SHIFT);
> > +     return 0;
> > +}
>
> This doesn't look like a hw_params operation - it doesn't appear to
> reference the params at all, or even containt any conditional
> statements.  Shouldn't this be configured just once at driver load?

Ok, I will update it.

best regards
wang shengjiu