linux-kernel - Re: [PATCH v5 2/2] ASoC: qcom: add apq8016 sound card support

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Date:	Tue, 09 Jun 2015 18:51:59 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Mark Brown <broonie@...nel.org>
CC:	alsa-devel@...a-project.org, Rob Herring <robh+dt@...nel.org>,
	Patrick Lai <plai@...eaurora.org>,
	Banajit Goswami <bgoswami@...eaurora.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	kwestfie@...eaurora.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v5 2/2] ASoC: qcom: add apq8016 sound card support



On 09/06/15 18:07, Mark Brown wrote:
> On Tue, Jun 09, 2015 at 01:59:36PM +0100, Srinivas Kandagatla wrote:
>
>> +	if (cpu_dai->id == MI2S_QUATERNARY) {
>> +		/* Configure the Quat MI2S to TLMM */
>> +		writel(readl(pdata->mic_iomux) |
>> +			MIC_CTRL_QUA_WS_SLAVE_SEL_10 |
>> +			MIC_CTRL_TLMM_SCLK_EN,
>> +			pdata->mic_iomux);
>> +
>> +		return 0;
>> +	} else if (cpu_dai->id == MI2S_PRIMARY) {
>> +		writel(readl(pdata->spkr_iomux) |
>> +			SPKR_CTL_PRI_WS_SLAVE_SEL_11,
>> +			pdata->spkr_iomux);
>> +
>> +		return 0;
>> +	}
>
> Why not just do these one time at probe, we don't undo them when we shut
> the DAI down?
If I do that Am afraid that the driver would loose the flexibility of 
selecting different MI2S from DT level. Hardcoding which MI2S can got to 
external or internal codec is something that I wanted to avoid from the 
start.

I will add the shutdown code to reset the configuration.

>
>> +
>> +	dev_err(card->dev, "unsupported cpu dai configuration\n");
>> +
>> +	return -EINVAL;
>
> It'd be clearer if this were part of the above code (which should still
> be written as a switch statement) - I was just asking myself what
> happens if we fall off the end of the if/else chain.

I will change this to switch case.

>
>> +		/**
>> +		 * External codec is ADV7533
>> +		 * and internal codec digital part is inside apq8016
>> +		 * and analog part is in PMIC PM8916
>> +		 **/
>> +		if (of_property_read_bool(np, "external"))
>> +			name = "ADV7533";
>> +		else
>> +			name = "WCD";
>
> If this is all the property is doing why not just put a link name
> property in the DT rather than this?  That makes the driver a bit more
> general and is more idiomatic.
Yes, it makes it more clear with link-name property. I will fix this in 
next version.
>
>> +		dai_link->name = dai_link->stream_name = name;
>
> Write two assignment statements, it's clearer and more idiomatic.
I will fix this too.
>
--srini
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