linux-kernel - Re: [PATCH V1 2/6] soc: qcom: dcc: Add driver support for Data Capture and Compare unit(DCC)

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Message-ID: <YEpGf7kQS53pByqC@builder.lan>
Date:   Thu, 11 Mar 2021 10:34:07 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     schowdhu@...eaurora.org
Cc:     Rob Herring <robh+dt@...nel.org>, Andy Gross <agross@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        sibis@...eaurora.org, saiprakash.ranjan@...eaurora.org,
        Rajendra Nayak <rnayak@...eaurora.org>, vkoul@...nel.org
Subject: Re: [PATCH V1 2/6] soc: qcom: dcc: Add driver support for Data
 Capture and Compare unit(DCC)

On Thu 11 Mar 04:06 CST 2021, schowdhu@...eaurora.org wrote:

> On 2021-03-11 04:49, Bjorn Andersson wrote:
> > On Wed 10 Mar 10:46 CST 2021, Souradeep Chowdhury wrote:
> > 
> > > The DCC is a DMA Engine designed to capture and store data
> > > during system crash or software triggers. The DCC operates
> > > based on link list entries which provides it with data and
> > > addresses and the function it needs to perform. These
> > > functions are read, write and loop. Added the basic driver
> > > in this patch which contains a probe method which instantiates
> > > the resources needed by the driver. DCC has it's own SRAM which
> > > needs to be instantiated at probe time as well.
> > > 
> > 
> > So to summarize, the DCC will upon a crash copy the configured region
> > into the dcc-ram, where it can be retrieved either by dumping the memory
> > over USB or from sysfs on the next boot?
> 
> Replied by Sai
> 

Thanks Souradeep and Sai, I'm definitely interested in learning more
about what the hardware block can do and how we can use it.

Regards,
Bjorn