linux-kernel - Re: [PATCH v3 05/12] ASoC: mediatek: mt8188: support etdm in platform driver

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Date:   Tue, 13 Dec 2022 14:30:51 +0000
From:   Trevor Wu (吳文良) <Trevor.Wu@...iatek.com>
To:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 05/12] ASoC: mediatek: mt8188: support etdm in platform
 driver

On Tue, 2022-12-13 at 11:45 +0100, AngeloGioacchino Del Regno wrote:
> Il 08/12/22 04:31, Trevor Wu ha scritto:
> > Add mt8188 etdm dai driver support.
> > 
> > Signed-off-by: Trevor Wu <trevor.wu@...iatek.com>
> > ---
> > I don't add Reviewed-by tag because one new header file is included
> > in the patch to resolve compiling issue found by kernel test robot.
> > Additionally, I re-layout the code for better understanding of the
> > follow-up patch.
> > ---
> >   sound/soc/mediatek/mt8188/mt8188-dai-etdm.c | 2591
> > +++++++++++++++++++
> >   1 file changed, 2591 insertions(+)
> >   create mode 100644 sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
> > 
> > diff --git a/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
> > b/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
> > new file mode 100644
> > index 000000000000..c653fa5e3f85
> > --- /dev/null
> > +++ b/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
> 
> ..snip..
> 
> > +
> > +static void mt8188_dai_etdm_parse_of(struct mtk_base_afe *afe)
> > +{
> > +	const struct device_node *of_node = afe->dev->of_node;
> > +	struct mt8188_afe_private *afe_priv = afe->platform_priv;
> > +	struct mtk_dai_etdm_priv *etdm_data;
> > +	int i, j;
> > +	char prop[48];
> > +	u8 disable_chn[MT8188_ETDM_MAX_CHANNELS];
> > +	int max_chn = MT8188_ETDM_MAX_CHANNELS;
> > +	u32 sel;
> > +	int ret;
> > +	int dai_id;
> > +	unsigned int sync_id;
> > +	struct {
> > +		const char *name;
> > +		const unsigned int sync_id;
> > +	} of_afe_etdms[MT8188_AFE_IO_ETDM_NUM] = {
> > +		{"etdm-in1", ETDM_SYNC_FROM_IN1},
> > +		{"etdm-in2", ETDM_SYNC_FROM_IN2},
> > +		{"etdm-out1", ETDM_SYNC_FROM_OUT1},
> > +		{"etdm-out2", ETDM_SYNC_FROM_OUT2},
> > +		{"etdm-out3", ETDM_SYNC_FROM_OUT3},
> > +	};
> > +
> > +	for (i = 0; i < MT8188_AFE_IO_ETDM_NUM; i++) {
> > +		dai_id = ETDM_TO_DAI_ID(i);
> > +		etdm_data = afe_priv->dai_priv[dai_id];
> > +
> > +		ret = snprintf(prop, sizeof(prop),
> > +			       "mediatek,%s-mclk-always-on-rate",
> > +			       of_afe_etdms[i].name);
> > +		if (ret < 0) {
> > +			dev_info(afe->dev, "%s snprintf err=%d\n",
> 
> Is this property optional? If yes, this dev_info() must be a
> dev_dbg(),
> otherwise, this must be a dev_err().
> 
> Please fix all prints to use the right message level.

Hi Angelo,

Yes, this property is optional, so I don't use dev_err here.
dev_dbg is hard to find the problem.
I will make use of dev_err instead of dev_info in V4.

> 
> > +				 __func__, ret);
> > +			return;
> 
> Also, is it possible to specify this property only on selected eTDMs?
> 
> As it is right now, if anyone wants to specify this only on, for
> example,
> etdm-out1 and out2, that won't work.
> In that case, you should replace that return with a `continue`.
> 
> P.S.: I'm raising this question because you're not forcing "all or
> nothing"
>        in commit [10/12] where you introduce the bindings for this
> driver,
>        so I suppose that returning (hence stopping to parse) is a
> mistake.
> 

It is OK to specify only etdm-out1 and out2 on.
This is just an simple error handling for snprintf to silence coverity.
Because it shouldn't happen, I don't return an error value to make
probe failed.

Thanks,
Trevor

> > +		}
> > +		ret = of_property_read_u32(of_node, prop, &sel);
> > +		if (ret == 0) {
> > +			etdm_data->mclk_dir = SND_SOC_CLOCK_OUT;
> > +			if (mtk_dai_etdm_cal_mclk(afe, sel, dai_id))
> > +				dev_info(afe->dev, "%s unsupported mclk
> > %uHz\n",
> > +					 __func__, sel);
> > +		}
> > +
> 
> 
> Regards,
> Angelo
>