linux-kernel - Re: [PATCH V1 0/1] soc: qcom: dcc: Add QAD, Cti-trigger and Bootconfig support for Data Capture and Compare(DCC)

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Date:   Tue, 10 Jan 2023 16:29:37 +0530
From:   Souradeep Chowdhury <quic_schowdhu@...cinc.com>
To:     Bjorn Andersson <andersson@...nel.org>
CC:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Alex Elder <elder@...e.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        Sai Prakash Ranjan <quic_saipraka@...cinc.com>,
        Sibi Sankar <quic_sibis@...cinc.com>,
        "Rajendra Nayak" <quic_rjendra@...cinc.com>, <vkoul@...nel.org>
Subject: Re: [PATCH V1 0/1] soc: qcom: dcc: Add QAD, Cti-trigger and
 Bootconfig support for Data Capture and Compare(DCC)



On 1/9/2023 8:48 PM, Bjorn Andersson wrote:
> On Mon, Jan 09, 2023 at 07:32:25PM +0530, Souradeep Chowdhury wrote:
>> This patch adds the Bootconfig, QAD and CTI-Trigger support for DCC.
>>
> 
> As with the other patch, please move your motivation into the commit
> message of the patch.
> 
> That said, this seems to be 3 different topics, and hence should be
> three different patches.

Ack

> 
>> 1.Bootconfig
>>
>> Bootconfig parser has been added to DCC driver so that the register addresses
>> can be configured during boot-time. This is used to debug crashes that can happen
>> during boot-time. The expected format of a bootconfig is as follows:-
>>
>> dcc_config {
>> 	link_list_0 {
>> 		qcom-curr-link-list = <The list number to configure>
>> 		qcom-link-list =  <Address as same format as dcc separated by '_'>,
>> 	}
>> }
>>
>> Example:
>>
>> dcc_config {
>> 	link_list_0 {
> 
> The name of the node does not seem to have any significance; this could
> be nice to mention. I also think it would set a good precedence if you
> used the number of the qcom-curr-link-list in the node name, rather than
> just an iterator...

Ack

> 
>> 		qcom-curr-link-list = 6
>> 		qcom-link-list = R_0x1781005c_1_apb,
>> 				 R_0x1782005c_1_apb
>> 	}
>> 	link_list_1 {
>> 		qcom-curr-link-list = 5
>> 		qcom-link-list = R_0x1784005c_1_apb
>> 	}
>> }
>>
>> 2.QAD
>>
>> QAD can be enabled as a part of debugfs file under each individual list folder.
>> QAD is used to specify the access control for DCC configurations, on enabling
>> it the access control to dcc configuration space is restricted.
>>
> 
> Who is locked out from this restricted access? Please mention why this
> is a good thing.

Ack

> 
>> 3.CTI-trigger
>>
>> CTI trigger is used to enable the Cross trigger interface for DCC. On enabling
>> CTI trigger the dcc software trigger can be done by writing to CTI trig-out.
>> Also the hwtrigger debugfs file is created which needs to be disabled for enabling
>> CTI-trigger.
>>
> 
> Please mention why hwtrigger needs to be disabled, and why does it need
> to be disabled?

Ack

> 
>> Changes in V1
>>
>> *Fixed the W=1 warnings in V0 of the patch
> 
> Please follow the standard practice of giving your first version of a
> patch version 1.

Ack

> 
> Thanks,
> Bjorn
> 
>>
>> Souradeep Chowdhury (1):
>>    soc: qcom: dcc: Add QAD, Ctitrigger and Bootconfig support for DCC
>>
>>   Documentation/ABI/testing/debugfs-driver-dcc |  24 +++
>>   drivers/soc/qcom/dcc.c                       | 284 ++++++++++++++++++++++++++-
>>   2 files changed, 304 insertions(+), 4 deletions(-)
>>
>> --
>> 2.7.4
>>