linux-kernel - Re: [PATCH 4/4] spi: s3c64xx: Fix large transfers with DMA

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Message-ID: <Yyh+5ZWXel9SHuWi@sirena.org.uk>
Date:   Mon, 19 Sep 2022 15:38:29 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     krzysztof.kozlowski@...aro.org, andi@...zian.org, kernel@...s.com,
        alim.akhtar@...sung.com, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/4] spi: s3c64xx: Fix large transfers with DMA

On Fri, Sep 16, 2022 at 01:39:51PM +0200, Vincent Whitchurch wrote:
> The COUNT_VALUE in the PACKET_CNT register is 16-bit so the maximum
> value is 65535.  Asking the driver to transfer a larger size currently
> leads to the DMA transfer timing out.  Fix this by splitting the
> transfer as needed.

The driver should just set max_transfer_size and let the core
handle this.

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