linux-kernel - Re: [PATCH 1/1] ASoC: codecs: max98090: Allow dsp

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Date:   Wed, 21 Jun 2023 16:02:34 +0300
From:   Maxim Kochetkov <fido_max@...ox.ru>
To:     Mark Brown <broonie@...nel.org>
Cc:     alsa-devel@...a-project.org, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Benjamin Mugnier <benjamin.mugnier@...s.st.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ASoC: codecs: max98090: Allow dsp_a mode



On 21.06.2023 15:26, Mark Brown wrote:
> On Wed, Jun 21, 2023 at 02:53:27PM +0300, Maxim Kochetkov wrote:
> 
>> TDM mode for max98090 is dsp_a compatible. So allow it.
> 
>>   		case SND_SOC_DAIFMT_DSP_A:
>> -			/* Not supported mode */
>> +			break;
> 
> This is configuring DSP A identically to left justified mode, it looks
> like the format configuration needs at least some interlock with the TDM
> configuration.

According to datasheet MAX98090 supports only DSP_A (L data MSB after 
FRM LRC) TDM mode. Allowing this mode will let us proper configure CPU 
audio node via DT. Actual TDM mode activation is performed in 
max98090_set_tdm_slot() via M98090_REG_TDM_FORMAT/M98090_REG_TDM_CONTROL 
registers.