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Tue, 1 Oct 2019 17:04:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1569949454; bh=UEkX/cHMbQ0sDePOFVv3FYadMtUY51cOeHadyFKhHvY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Amc4WfDqR/Ia2oe2RA7vGkjDeZHnbdBIgta2AynRkAwnAg0DKlyrue7DBbGM2Zhb5 vGwuYZkfCUQAHLfmEkZ4PpW4V1SYojQvaVT//h5rwM4kfQ3lgT6iOMSdCCmBo8q1bl uGQDcZFuvPCNecg3TlEHS0/XCvOgiPl9Mv/+wDig= MIME-Version: 1.0 Date: Tue, 01 Oct 2019 10:04:14 -0700 From: Sai Prakash Ranjan To: Jeffrey Hugo Subject: Re: [PATCHv9 2/3] arm64: dts: qcom: msm8998: Add Coresight support In-Reply-To: References: <90114e06825e537c3aafd3de5c78743a9de6fadc.1564550873.git.saiprakash.ranjan@codeaurora.org> Message-ID: <16212a577339204e901cf4eefa5e82f1@codeaurora.org> X-Sender: saiprakash.ranjan@codeaurora.org User-Agent: Roundcube Webmail/1.2.5 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191001_100421_760249_0C6DB830 X-CRM114-Status: GOOD ( 10.47 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Rajendra Nayak , Mathieu Poirier , Suzuki K Poulose , Alexander Shishkin , MSM , Marc Gonzalez , lkml , Bjorn Andersson , David Brown , Andy Gross , Sibi Sankar , Vivek Gautam , Leo Yan , 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 On 2019-10-01 09:13, Jeffrey Hugo wrote: > Sai, > > This patch breaks boot on the 835 laptops. However, I haven't seen > the same issue on the MTP. I wonder, is coresight expected to work > with production fused devices? I wonder if thats the difference > between the laptop and MTP that is causing the issue. > > Let me know what I can do to help debug. > I did test on MSM8998 MTP and didn't face any issue. I am guessing this is the same issue which you reported regarding cpuidle? Coresight ETM and cpuidle do not work well together since ETMs share the same power domain as CPU and they might get turned off when CPU enters idle states. Can you try with cpuidle.off=1 cmdline or just remove idle states from DT to confirm? If this is the issue, then we can try the below patch from Andrew Murray for ETM save and restore: https://patchwork.kernel.org/patch/11097893/ It is not merged yet. They would appreciate your tested by ;) Thanks, Sai _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel