linux-kernel - Re: [PATCH v4 4/8] ASoC: sun8i-codec-analog: Add amplifier event to fix first delay

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Message-ID: <20170210120132.4w6rv6fagnebfben@sirena.org.uk>
Date:   Fri, 10 Feb 2017 12:01:32 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Mylène Josserand 
        <mylene.josserand@...e-electrons.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: Re: [PATCH v4 4/8] ASoC: sun8i-codec-analog: Add amplifier event to
 fix first delay

On Fri, Feb 10, 2017 at 02:08:54PM +0800, Chen-Yu Tsai wrote:

> One solution that might work is to mute the headphone output
> while the amp is being charged, by setting SUN8I_ADDA_HP_VOLC_HP_VOL
> to 0, and then restoring the value once it is charged. In other
> words, overriding the value for the duration of sun8i_headphone_amp_event.

This sounds like you want to make it an _AUTODISABLE control.

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