[alsa-devel] [PATCH 1/3] ASoC: max98927: Added support for DSP_A and DSP_B format

[Ryan Lee]

>-----Original Message-----
>From: Mark Brown [mailto:broonie at kernel.org]
>Sent: Thursday, September 14, 2017 11:50 AM
>To: Ryan Lee <RyanS.Lee at maximintegrated.com>
>Cc: lgirdwood at gmail.com; perex at perex.cz; tiwai at suse.com;
>kuninori.morimoto.gx at renesas.com; alsa-devel at alsa-project.org; linux-
>kernel at vger.kernel.org; ryan.lee.maxim at gmail.com
>Subject: Re: [PATCH 1/3] ASoC: max98927: Added support for DSP_A and
>DSP_B format
>
>On Mon, Sep 11, 2017 at 09:12:18AM -0700, Ryan Lee wrote:
>> Signed-off-by: Ryan Lee <ryans.lee at maximintegrated.com>
>> ---
>
>Please make an effort to write changelogs that clearly describe the change
>you're making.  This is doing way more than just implementing DSP mode, it's
>also adding a fairly complicated set_tdm_slot() implementation which isn't
>mentioned at all.  It probably needs splitting into multiple patches as well.

I split this patch as two separated patches and sent again.
One is about adding DSP_A, DSP_B support.
Another is about TDM slot configuration.
I added more changelog inside.

>
>> @@ -414,6 +504,9 @@ static int max98927_dac_event(struct
>snd_soc_dapm_widget *w,
>>  	struct max98927_priv *max98927 =
>snd_soc_codec_get_drvdata(codec);
>>
>>  	switch (event) {
>> +	case SND_SOC_DAPM_PRE_PMU:
>> +		max98927->tdm_mode = 0;
>> +		break;
>>  	case SND_SOC_DAPM_POST_PMU:
>>  		regmap_update_bits(max98927->regmap,
>>  			MAX98927_R003A_AMP_EN,
>
>Why is an event associated with the DAC changing something related to the DAI
>format?  These things should be unrelated.

In TDM mode, BCLK is being configured inside 'max98927_dai_tdm_slot' because TDM slot information(number of slots, slot width) is available in there.
In normal case, BCLK is being configured when 'hw_params' is called and TDM slot information is not available in this function.
So I added 'tdm_mode' variable to avoid overwrite BCLK configuration when 'hw_params' function is called after TDM slot configuration is done.
I wanted to clear this variable once playback is over so I added clear function when DAPM event is received.
I referred some codec driver change TDM related things when DAC event is received after TDM slot configuration is done.