linux-kernel - Re: [PATCH v2 2/2] i2c: tegra: Synchronize DMA before termination

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Message-ID: <20200415163123.GD2830@ninjato>
Date:   Wed, 15 Apr 2020 18:31:24 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] i2c: tegra: Synchronize DMA before termination

On Tue, Mar 24, 2020 at 10:12:17PM +0300, Dmitry Osipenko wrote:
> DMA transfer could be completed, but CPU (which handles DMA interrupt)
> may get too busy and can't handle the interrupt in a timely manner,
> despite of DMA IRQ being raised. In this case the DMA state needs to
> synchronized before terminating DMA transfer in order not to miss the
> DMA transfer completion.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>

Applied to for-current, thanks!


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