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: <d7af44c2f9be4b50136b61ca39a814eb@codeaurora.org>
Date:   Mon, 15 Mar 2021 00:49:03 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     schowdhu@...eaurora.org, 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, 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 2021-03-11 22:04, Bjorn Andersson wrote:
> 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.
> 

Thanks Bjorn, hopefully example in the other thread provides some good
view of the capability of DCC. Please let us know if you need any more
details.

Thanks,
Sai
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