linux-kernel - Re: [PATCH] ASoC: mediatek: mt8195: update audio tuner settings

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Message-ID: <ea20ff46-11fe-12c4-3e2a-5058f9065c60@collabora.com>
Date:   Wed, 28 Sep 2022 10:11:37 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Trevor Wu <trevor.wu@...iatek.com>, broonie@...nel.org,
        tiwai@...e.com, matthias.bgg@...il.com
Cc:     alsa-devel@...a-project.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: mediatek: mt8195: update audio tuner settings

Il 27/09/22 17:11, Trevor Wu ha scritto:
> Audio tuner is used to handle clock drift between 26M and APLL domain.
> 
> It's expected when abs(chg_cnt) equals to upper bound, tuner updates pcw
> setting automatically, and then abs(chg_cnt) decreases.
> In the stress test, we found abs(chg_cnt) possibly equals to 2 at the
> unexpected timing. This results in wrong pcw updating.
> Finally, abs(chg_cnt) will always be larger than upper bound,
> 
> As a result, we update the upper bound to 3 to handle the corner case.
> 
> Signed-off-by: Trevor Wu <trevor.wu@...iatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>