linux-kernel - Re: [PATCH v1] dmaengine: tegra-apb: Ensure that clock is enabled during of DMA synchronization

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Date:   Mon, 27 Apr 2020 21:35:43 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Laxman Dewangan <ldewangan@...dia.com>,
        Dan Williams <dan.j.williams@...el.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-apb: Ensure that clock is enabled
 during of DMA synchronization

On 26-04-20, 22:08, Dmitry Osipenko wrote:
> DMA synchronization hook checks whether interrupt is raised by testing
> corresponding bit in a hardware status register, and thus, clock should
> be enabled in this case, otherwise CPU may hang if synchronization is
> invoked while Runtime PM is in suspended state. This patch resumes the RPM
> during of the DMA synchronization process in order to avoid potential
> problems. It is a minor clean up of a previous commit, no real problem is
> fixed by this patch because currently RPM is always in a resumed state
> while DMA is synchronized, although this may change in the future.

Applied, thanks

-- 
~Vinod