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Tue, 15 Jan 2019 16:29:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1547569763; bh=UvXAVr5rAfYcmmPYgTtQFy9MuZWOaQi5am+NVzDZMm4=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=Mqov6+qjpmZKrAZcajDHX1ZW1s6UIdGD+XFxYXOQ7iPk3f6PGCMBGiVyewCv5WIzk 10HJsWb56XciJCE+OyXx41wGZwm5yHC0ZiVSp5Kj3jAwe67gRPJjbFoLkXs7C8m2p1 tr3qN2UekdJ0gtEo77WTDRgBy3RgzkJw5/SMyIwI= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org AFE6A605A0 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=saiprakash.ranjan@codeaurora.org Subject: Re: [PATCH 1/3] arm64: dts: qcom: sdm845: Add Coresight support To: Mathieu Poirier References: <20190111184643.GA22691@xps15> <81172d85ed7782e0db561fcf96a82d46@codeaurora.org> <20190114153509.GA29374@xps15> From: Sai Prakash Ranjan Message-ID: Date: Tue, 15 Jan 2019 21:59:11 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190114153509.GA29374@xps15> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190115_082925_437893_D578B4DE X-CRM114-Status: GOOD ( 15.81 ) 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-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Mathieu, On 1/14/2019 9:05 PM, Mathieu Poirier wrote: > 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. > Sure, will add it in the next version. Thanks, 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