linux-kernel - Re: [PATCH v1 3/6] ASoC: codecs: msm8916-wcd-analog: move codec reset to probe

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Message-ID: <20170728134013.vsneppa35kra77ot@sirena.org.uk>
Date:   Fri, 28 Jul 2017 14:40:13 +0100
From:   Mark Brown <broonie@...nel.org>
To:     srinivas.kandagatla@...aro.org
Cc:     Banajit Goswami <bgoswami@...eaurora.org>,
        alsa-devel@...a-project.org, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Patrick Lai <plai@...eaurora.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/6] ASoC: codecs: msm8916-wcd-analog: move codec
 reset to probe

On Wed, Jul 26, 2017 at 02:35:09AM +0200, srinivas.kandagatla@...aro.org wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> 
> This patch move the codec reset code from dai ops to codec probe, so
> that the codec is not held in reset when headset detection block is
> still active.

This means that the CODEC will no longer be held in reset (which
presumably has a power benefit or something) even if jack detection
isn't in use.  What most devices do is have things like this be
controlled via the bias level or other power management functions and
then have jack detection hold the CODEC out of the lowest power states
when it's active.

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