From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0070C43387 for ; Fri, 18 Jan 2019 11:48:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9B76820823 for ; Fri, 18 Jan 2019 11:48:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="LFgvatob"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="Ec33FAKf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727396AbfARLsL (ORCPT ); Fri, 18 Jan 2019 06:48:11 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:48996 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727115AbfARLsL (ORCPT ); Fri, 18 Jan 2019 06:48:11 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 466886053B; Fri, 18 Jan 2019 11:48:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1547812090; bh=MShgtf1g2WW51ztF9muOxPJZV5eRh6Y1ynlNDp9Rvm0=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=LFgvatobMk6GpbFSI/8oXHx//+0LIUpCLeGjp4dFs4cegoIcZ50FqOY8OtBb58z6Z kpBNxXe5yc1oTCRUBTcYFOFt5Neog9X3DMpDjqdFzugWLzsfp/RMQyP32cjF7Xba8R CzjdCcMhId4lVAXItkKttDx+l7seygdLDJ0zRKfc= Received: from [10.79.129.0] (blr-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.18.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: saiprakash.ranjan@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id AB07660388; Fri, 18 Jan 2019 11:48:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1547812089; bh=MShgtf1g2WW51ztF9muOxPJZV5eRh6Y1ynlNDp9Rvm0=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=Ec33FAKffme3+o2l24D5MR08kw2B1FanTvhXwaKCrU6KVt34UVHTWSPXIIk+V7w54 ARr8zyJ7a+pEAf9jd0p491iwcRbChfje5Qn0O+vlytEhEX8t+rsqbuQLjr4x8v6T6V /rEyAUfcg3nK9brr98ka/JXI2qALJ2mUXNYhvFY0= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org AB07660388 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: [PATCHv2 2/4] arm64: dts: qcom: msm8996: Add Coresight support To: Suzuki K Poulose , robh+dt@kernel.org, mathieu.poirier@linaro.org, leo.yan@linaro.org, alexander.shishkin@linux.intel.com, andy.gross@linaro.org, david.brown@linaro.org, vivek.gautam@codeaurora.org, dianders@chromium.org, sboyd@kernel.org, bjorn.andersson@linaro.org, devicetree@vger.kernel.org, mark.rutland@arm.com Cc: rnayak@codeaurora.org, sibis@codeaurora.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org References: <552e408950525b1bac39d05b8b4f2ae1975397e0.1547798966.git.saiprakash.ranjan@codeaurora.org> <1311e78a-21f6-6470-7861-39b3499974ce@arm.com> From: Sai Prakash Ranjan Message-ID: <6543ad5c-bbcf-b3ec-332c-115e8e3d0825@codeaurora.org> Date: Fri, 18 Jan 2019 17:18:01 +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: <1311e78a-21f6-6470-7861-39b3499974ce@arm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Suzuki, On 1/18/2019 4:27 PM, Suzuki K Poulose wrote: > > If you want to use the scatter-gather mode, you must add > "arm,scatter-gather" > property to the node here. > > Have you tested the scatter-gather mode on the chip ? Does that work at > all ? > Note: You could try this by setting a buffer_size > 1M for the ETR and use > it as a sink from the sysfs mode. > Yes the chip supports scatter-gather mode[1]. But is it required in dt node since it's an optional property? [1] https://source.codeaurora.org/quic/la/kernel/msm-3.18/tree/arch/arm/boot/dts/qcom/msm8996-coresight-v3.dtsi?h=LA.BR.5.6#n24 Thanks, Sai -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation