linux-kernel - Re: [PATCH v3 1/4] ASoC: es8316: judge PCM rate at later timing

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Date:   Thu, 5 Sep 2019 00:55:21 +0900
From:   Katsuhiro Suzuki <katsuhiro@...suster.net>
To:     Mark Brown <broonie@...nel.org>
Cc:     David Yang <yangxiaohua@...rest-semi.com>,
        Daniel Drake <drake@...lessm.com>,
        Hans de Goede <hdegoede@...hat.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/4] ASoC: es8316: judge PCM rate at later timing

On 2019/09/05 0:30, Mark Brown wrote:
> On Thu, Sep 05, 2019 at 12:06:23AM +0900, Katsuhiro Suzuki wrote:
> 
>> Would you tell me one more thing. I don't understand who sets MCLK to 0.
>> Is it needed original machine driver instead of audio-graph-card?
> 
>> On my test environment (audio-graph-card + Rockchip I2S + ES8316), it
>> seems audio-graph-card has never called set_sysclk() with freq = 0 after
>> stop play/capture sound. So my env will go to bad scenario as I described in
>> this patch.
> 
> You shouldn't need a custom machine driver - you'll just be the first
> person who ran into this with audio-graph-card.  I'd just add this
> support to the audio-graph-card, either with custom startup and shutdown
> callbacks or using a set_bias_level() callback (both get used, I'd guess
> the set_bias_level() is easier since you don't need to reference count
> anything).
> 

Oh, I understand current situation. I'll try it.
Thanks for your support!

Best Regards,
Katsuhiro Suzuki