From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: saiprakash.ranjan@codeaurora.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: Mon, 14 Jan 2019 08:35:09 -0700 [thread overview]
Message-ID: <20190114153509.GA29374@xps15> (raw)
In-Reply-To: <81172d85ed7782e0db561fcf96a82d46@codeaurora.org>
On Sat, Jan 12, 2019 at 06:21:00PM +0530, saiprakash.ranjan@codeaurora.org wrote:
> 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.
Ok, if that is the case please add a comment to explain the situation.
Otherwise someone will assuredly ask again in the future.
Mathieu
>
> - Sai
>
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of
> Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2019-01-14 15:35 UTC|newest]
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
2019-01-14 15:35 ` Mathieu Poirier [this message]
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
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