linux-kernel - Re: [PATCH v4 1/3] ASoC: rockchip: i2s: switch BCLK to GPIO

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Date:   Wed, 22 Jun 2022 11:52:22 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Chen-Yu Tsai <wens@...nel.org>
Cc:     Judy Hsiao <judyhsiao@...omium.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Brian Norris <briannorris@...omium.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/3] ASoC: rockchip: i2s: switch BCLK to GPIO

On Wed, Jun 22, 2022 at 02:02:41AM +0800, Chen-Yu Tsai wrote:
> Hi,
> 
> On Sun, Jun 19, 2022 at 5:54 PM Judy Hsiao <judyhsiao@...omium.org> wrote:
> >
> > We discoverd that the state of BCLK on, LRCLK off and SD_MODE on
> > may cause the speaker melting issue. Removing LRCLK while BCLK
> > is present can cause unexpected output behavior including a large
> > DC output voltage as described in the Max98357a datasheet.
> >
> > In order to:
> >   1. prevent BCLK from turning on by other component.
> >   2. keep BCLK and LRCLK being present at the same time
> >
> > This patch switches BCLK to GPIO func before LRCLK output, and

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