linux-kernel - Re: [PATCH] ASoC: fsl: sai: Reduce underrun when stream starts

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Message-ID: <CAOMZO5CLjZ7W0Z4ZHbx1YXMxjH5RzjEQPxPtP4Sd+ANF_eyG+g@mail.gmail.com>
Date:   Fri, 8 Mar 2019 13:16:04 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Daniel Baluta <daniel.baluta@....com>
Cc:     "broonie@...nel.org" <broonie@...nel.org>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Xiubo.Lee@...il.com" <Xiubo.Lee@...il.com>,
        "nicoleotsuka@...il.com" <nicoleotsuka@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "S.j. Wang" <shengjiu.wang@....com>
Subject: Re: [PATCH] ASoC: fsl: sai: Reduce underrun when stream starts

Hi Daniel,

On Fri, Mar 8, 2019 at 1:09 PM Daniel Baluta <daniel.baluta@....com> wrote:
>
> From: Shengjiu Wang <shengjiu.wang@....com>
>
> Write initial words into SAI FIFO to reduce the underrun
> error.

Please provide a better explanation.

Why does performing these writes help?

Also, the commit message says "reduce", so it seems this is a
workaround instead of a proper fix?