linux-kernel - Re: AW: [PATCH] ASoC: sgtl5000: fix powerup/down of micbias-voltage

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Message-ID: <20180111161947.GD7834@sirena.org.uk>
Date:   Thu, 11 Jan 2018 16:19:47 +0000
From:   Mark Brown <broonie@...nel.org>
To:     "Fischer, Christian" <fischerc@...ssphone.de>
Cc:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "richard.leitner@...data.com" <richard.leitner@...data.com>,
        "fabio.estevam@....com" <fabio.estevam@....com>,
        "bhumirks@...il.com" <bhumirks@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: AW: [PATCH] ASoC: sgtl5000: fix powerup/down of micbias-voltage

On Thu, Jan 11, 2018 at 04:14:31PM +0000, Fischer, Christian wrote:
> Hi Mark,

Please don't top post, reply in line with needed context.  This allows
readers to readily follow the flow of conversation and understand what
you are talking about and also helps ensure that everything in the
discussion is being addressed.

> Testing:
> arecord -D "hw:0,1" -c 2 -f S16_LE -t wav test_recording.wav
> Recording WAVE 'test_recording.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Stereo
> ==> no event was fired

Has your board connected the bias to the microphone widget it defines?
Unless your board says that the bias is in use on a given board it won't
be enabled.

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