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

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Message-ID: <20190426124748.GF28103@vkoul-mobl>
Date:   Fri, 26 Apr 2019 18:17:48 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
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

On 26-04-19, 15:19, Dmitry Osipenko wrote:
> 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
> > 
> 
> Looks like you answered to a wrong email.

Yes looks like I did, apologies for that :(

-- 
~Vinod