linux-kernel - Re: [PATCH v2] spi: spi-mtk-nor: Optimize timeout for dma read

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Date:   Mon, 14 Nov 2022 12:32:31 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Bayi Cheng <bayi.cheng@...iatek.com>,
        Mark Brown <broonie@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Ikjoon Jang <ikjn@...omium.org>
Cc:     linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2] spi: spi-mtk-nor: Optimize timeout for dma read

Il 14/11/22 09:13, Bayi Cheng ha scritto:
> From: bayi cheng <bayi.cheng@...iatek.com>
> 
> The timeout value of the current dma read is unreasonable. For example,
> If the spi flash clock is 26Mhz, It will takes about 1.3ms to read a
> 4KB data in spi mode. But the actual measurement exceeds 50s when a
> dma read timeout is encountered.
> 
> In order to be more accurately, It is necessary to use usecs_to_jiffies,
> After modification, the measured timeout value is about 130ms.
> 
> Signed-off-by: bayi cheng <bayi.cheng@...iatek.com>

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