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[68.147.8.254]) by smtp.gmail.com with ESMTPSA id k186sm958664pge.13.2019.01.14.07.35.11 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 14 Jan 2019 07:35:12 -0800 (PST) Date: Mon, 14 Jan 2019 08:35:09 -0700 From: Mathieu Poirier To: saiprakash.ranjan@codeaurora.org Subject: Re: [PATCH 1/3] arm64: dts: qcom: sdm845: Add Coresight support Message-ID: <20190114153509.GA29374@xps15> References: <20190111184643.GA22691@xps15> <81172d85ed7782e0db561fcf96a82d46@codeaurora.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <81172d85ed7782e0db561fcf96a82d46@codeaurora.org> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190114_073514_440583_06B84482 X-CRM114-Status: GOOD ( 15.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Rajendra Nayak , Suzuki K Poulose , Alexander Shishkin , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, David Brown , Rob Herring , Sibi Sankar , Vivek Gautam , Leo Yan , Andy Gross , linux-arm-msm-owner@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel