LKML Archive on lore.kernel.org
 help / color / Atom feed
From: saiprakash.ranjan@codeaurora.org
To: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Leo Yan <leo.yan@linaro.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Andy Gross <andy.gross@linaro.org>,
	David Brown <david.brown@linaro.org>,
	devicetree@vger.kernel.org, Mark Rutland <mark.rutland@arm.com>,
	Rajendra Nayak <rnayak@codeaurora.org>,
	Vivek Gautam <vivek.gautam@codeaurora.org>,
	Sibi Sankar <sibis@codeaurora.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-arm-msm-owner@vger.kernel.org
Subject: Re: [PATCH 1/3] arm64: dts: qcom: sdm845: Add Coresight support
Date: Sat, 12 Jan 2019 18:21:00 +0530
Message-ID: <81172d85ed7782e0db561fcf96a82d46@codeaurora.org> (raw)
In-Reply-To: <20190111184643.GA22691@xps15>

Hi Mathieu,

>> +
>> +	etm@7040000 {
>> +		compatible = "arm,coresight-etm4x", "arm,primecell";
>> +		arm,primecell-periphid = <0x000bb95d>;
> 
> I'm a little curious as to why you need to bypass the normal AMBA bus 
> discovery
> method by forcing the peripheral ID.  Tracers don't show up the way 
> other
> coresight devices do at boot time?
> 

Yes on some Qcom SoC's like SDM845 and also on some previous ones, for 
ETM(only) amba bus discovery method fails because of wrong pid read from 
the registers. So we have to force this primecell peripheral ids to 
probe etm.

- Sai

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

  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-09 17:46 [PATCH 0/3] Add coresight support for SDM845 Sai Prakash Ranjan
2019-01-09 17:46 ` [PATCH 1/3] arm64: dts: qcom: sdm845: Add Coresight support Sai Prakash Ranjan
2019-01-11 18:46   ` Mathieu Poirier
2019-01-12 12:51     ` saiprakash.ranjan [this message]
2019-01-14 15:35       ` Mathieu Poirier
2019-01-15 16:29         ` Sai Prakash Ranjan
2019-01-13  7:23   ` Bjorn Andersson
2019-01-15 16:27     ` Sai Prakash Ranjan
2019-01-17 19:50       ` Bjorn Andersson
2019-01-18  3:00         ` Sai Prakash Ranjan
2019-01-09 17:46 ` [PATCH 2/3] coresight: etm4x: Add support to enable ETMv4.2 Sai Prakash Ranjan
2019-01-11 18:52   ` Mathieu Poirier
2019-01-12 12:33     ` saiprakash.ranjan
2019-01-09 17:46 ` [PATCH 3/3] arm64: dts: qcom: sdm845: Remove the duplicate header inclusion Sai Prakash Ranjan
2019-01-09 22:57   ` Doug Anderson
2019-01-10  4:42     ` Sai Prakash Ranjan

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=81172d85ed7782e0db561fcf96a82d46@codeaurora.org \
    --to=saiprakash.ranjan@codeaurora.org \
    --cc=alexander.shishkin@linux.intel.com \
    --cc=andy.gross@linaro.org \
    --cc=david.brown@linaro.org \
    --cc=devicetree@vger.kernel.org \
    --cc=leo.yan@linaro.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-arm-msm-owner@vger.kernel.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=mathieu.poirier@linaro.org \
    --cc=rnayak@codeaurora.org \
    --cc=robh+dt@kernel.org \
    --cc=sibis@codeaurora.org \
    --cc=suzuki.poulose@arm.com \
    --cc=vivek.gautam@codeaurora.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org linux-kernel@archiver.kernel.org
	public-inbox-index lkml


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/ public-inbox