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SubjectRE: [PATCH 1/3] ASoC: max98927: Added support for DSP_A and DSP_B format
>-----Original Message-----
>From: Mark Brown []
>Sent: Thursday, September 14, 2017 11:50 AM
>To: Ryan Lee <>
>;; linux-
>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 <>
>> ---
>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 =
>> switch (event) {
>> + max98927->tdm_mode = 0;
>> + break;
>> 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.

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