linux-kernel - Re: [PATCH 0/4] dmaengine: qcom: bam_dma: fixes for remotely controlled bam

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Date:   Wed, 17 Jan 2018 21:29:31 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Andy Gross <andy.gross@...aro.org>, dmaengine@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Brown <david.brown@...aro.org>,
        Dan Williams <dan.j.williams@...el.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        yanhe@...cinc.com, ramkri@....qualcomm.com, sdharia@...cinc.com
Subject: Re: [PATCH 0/4] dmaengine: qcom: bam_dma: fixes for remotely
 controlled bam

On Wed, Jan 17, 2018 at 10:55:34AM +0000, Srinivas Kandagatla wrote:
> 
> 
> On 17/01/18 10:18, Vinod Koul wrote:
> >On Tue, Jan 16, 2018 at 07:02:32PM +0000, srinivas.kandagatla@...aro.org wrote:
> >>From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> >>
> >>Hi Andy,
> >>
> >>I did hit few issues while trying out SLIMBus BAM on DB820c, this BAM instance
> >>is remotely controlled and powered up after ADSP is booted using QMI commands.
> >
> >What do you mean by "remotely controlled" in this series?
> 
> DMA controller is controlled by the remote processor, which is a DSP in this
> case.
> Linux side is in remote mode in this setup, this can setup transfer
> descriptors and start/stop a transfer. But all the initialization/powerup
> part will be done in the remote processor.

Yeah that was my guess too. So in this case does linux see these
controllers/channels, i would presume no...

-- 
~Vinod