linux-kernel - Re: [PATCH v1] dmaengine: tegra: Use relaxed versions of readl/writel

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Message-ID: <68c342e2-5662-5632-82aa-659da0381f54@gmail.com>
Date:   Fri, 26 Apr 2019 15:19:22 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Laxman Dewangan <ldewangan@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        dmaengine@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] dmaengine: tegra: Use relaxed versions of readl/writel

26.04.2019 15:01, Vinod Koul пишет:
> On 25-04-19, 02:17, Dmitry Osipenko wrote:
>> The readl/writel functions are inserting memory barrier in order to
>> ensure that memory stores are completed. On Tegra20 and Tegra30 this
>> results in L2 cache syncing which isn't a cheapest operation. The
>> tegra20-apb-dma driver doesn't need to synchronize generic memory
>> accesses, hence use the relaxed versions of the functions.
> 
> Subsystem name is **dmaengine** not dma! Please fix that
> 

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