linux-kernel - Re: [PATCH v3 4/8] ASoC: sun8i-codec-analog: Add amplifier event to fix first delay

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Message-ID: <20170131103519.5g5tmnwwyjz47zds@lukather>
Date:   Tue, 31 Jan 2017 11:35:19 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Mylène Josserand 
        <mylene.josserand@...e-electrons.com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, wens@...e.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        thomas.petazzoni@...e-electrons.com,
        alexandre.belloni@...e-electrons.com
Subject: Re: [PATCH v3 4/8] ASoC: sun8i-codec-analog: Add amplifier event to
 fix first delay

On Tue, Jan 31, 2017 at 11:05:48AM +0100, Mylène Josserand wrote:
> When playing a sound for the first time, a short delay, where the audio
> file is not played, can be noticed.
> On a second play (right after), the sound is played correctly.
> If we wait a short time (~5 sec which corresponds to the aplay
> timeout), the delay is back.
> 
> This patch fixes it by using an event on headphone amplifier.
> It allows to keep the amplifier enable while playing a sound.
> A delay of 700ms allows to wait that the amplifier is powered-up
> before playing the sound.
> 
> Signed-off-by: Mylène Josserand <mylene.josserand@...e-electrons.com>

Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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