Re: [PATCH] coresight: etm4x: Add support to disable trace unit power up

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Hi Mathieu,

On 2020-05-15 20:22, Mathieu Poirier wrote:
On Thu, 14 May 2020 at 12:39, Sai Prakash Ranjan
<saiprakash.ranjan@xxxxxxxxxxxxxx> wrote:

Hi Mathieu,

On 2020-05-14 23:30, Mathieu Poirier wrote:
> Good morning Sai,
>
> On Thu, May 14, 2020 at 04:29:15PM +0530, Sai Prakash Ranjan wrote:
>> From: Tingwei Zhang <tingwei@xxxxxxxxxxxxxx>
>>
>> On some Qualcomm Technologies Inc. SoCs like SC7180, there
>> exists a hardware errata where the APSS (Application Processor
>> SubSystem)/CPU watchdog counter is stopped when ETM register
>> TRCPDCR.PU=1.
>
> Fun stuff...
>

Yes :)

>> Since the ETMs share the same power domain as
>> that of respective CPU cores, they are powered on when the
>> CPU core is powered on. So we can disable powering up of the
>> trace unit after checking for this errata via new property
>> called "qcom,tupwr-disable".
>>
>> Signed-off-by: Tingwei Zhang <tingwei@xxxxxxxxxxxxxx>
>> Co-developed-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx>
>> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx>
>
> Co-developed-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx>
> Signed-off-by: Tingwei Zhang <tingwei@xxxxxxxxxxxxxx>
>

Tingwei is the author, so if I understand correctly, his signed-off-by
should appear first, am I wrong?

It's a gray area and depends on who's code is more prevalent in the
patch.  If Tingwei wrote the most of the code then his name is in the
"from:" section, yours as co-developer and he signs off on it (as I
suggested).  If you did most of the work then it is the opposite.
Adding a Co-developed and a signed-off with the same name doesn't make
sense.


I did check the documentation for submitting patches:
Documentation/process/submitting-patches.rst. And it clearly states
that "Co-developed-by must be followed by Signed-off by the co-author
and the last Signed-off-by: must always be that of the developer
submitting the patch".

Quoting below from the doc:

Co-developed-by: <snip> ...Since
Co-developed-by: denotes authorship, every Co-developed-by: must be immediately followed by a Signed-off-by: of the associated co-author. Standard sign-off procedure applies, i.e. the ordering of Signed-off-by: tags should reflect the chronological history of the patch insofar as possible, regardless of whether the author is attributed via From: or Co-developed-by:. Notably, the last Signed-off-by: must always be that of the developer submitting the patch.


>> ---
>>  .../devicetree/bindings/arm/coresight.txt     |  6 ++++
>>  drivers/hwtracing/coresight/coresight-etm4x.c | 29
>> ++++++++++++-------
>
> Please split in two patches.
>

Sure, I will split the dt-binding into separate patch, checkpatch did
warn.

And you still sent me the patch...  I usually run checkpatch before
all the submissions I review and flatly ignore patches that return
errors.  You got lucky...


I did not mean to ignore it or else I wouldn't have run checkpatch itself. I checked other cases like "arm,scatter-gather" where the binding and the driver change was in a single patch, hence I thought it's not a very strict rule.

Thanks,
Sai
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation



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