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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 66F7BC43327 for ; Mon, 29 Jun 2026 14:29:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=wBpbsi5FzX0qyeI5y08KpDoYRn3UiM6EZGXZ0C5P48Q=; b=BcaWEs9Gv7HpXM9SJChvzfGcIg B+WDqxMw1DP0G0Qvr6gAt5IwT6QYxtwc/czeZS+mGmrdGierZ5EMvJlTCNUoeGNuhCL7mkqeeynup 8uWy4fqo09GGgLhixFzworAxKFAdkkxNAGr0qqPxeKKPcGq6VkamdIrCRiZfNI/05SitUC3GizHOo Hd3/FjlTEjGJlFhrbmzQXgd7geFlO7dV89JpHoynjQL24EmRw7ZtY1DZ5jzW8ZWGeIV2q60DRl6J/ kChf2D9pW9MLVRmLNlvfFB9/g5KxBtKg0NNGvrJrAWu27NIwYo2IuGWrrhuvRKn+H2Bx6mheRsZxB nv61mo5Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1weCym-0000000EscM-19CU; Mon, 29 Jun 2026 14:28:56 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1weCyk-0000000Esbk-2B47 for linux-arm-kernel@lists.infradead.org; Mon, 29 Jun 2026 14:28:55 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id CA28416A3; Mon, 29 Jun 2026 07:28:46 -0700 (PDT) Received: from localhost (unknown [10.2.196.114]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C80543F905; Mon, 29 Jun 2026 07:28:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1782743331; bh=rVIpgPhieX/hjC3o46WFkzWX0pZQG5WKKAO87ImTv3w=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=eQzriMHvEelb+GRgBs6E+iOc+LzatJGj0P3ERA+k3ICsHUL0BLFmbopMkhXEEEjFM GI6HS3b+ecuLQ2wXtZxrj3DKrOouxsynsOan44cbs9/dmaqesyIJTMT9ptNsqnY4ao bNr/i7lLu4m6jI0q4LwManSJOY/hukQweyviJSdg= Date: Mon, 29 Jun 2026 15:28:48 +0100 From: Leo Yan To: Jie Gan Cc: Suzuki K Poulose , Mike Leach , James Clark , Konrad Dybcio , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Tingwei Zhang , Jingyi Wang , Abel Vesa , Yuanfang Zhang , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: kaanapali: fix traceNoC probe issue Message-ID: <20260629142848.GB1812158@e132581.arm.com> References: <471d7a92-3629-4274-a303-8906d3626037@arm.com> <25d7d3a1-58e0-4f25-a73a-59a978130c47@oss.qualcomm.com> <20260624151610.GC575984@e132581.arm.com> <20260625085643.GD575984@e132581.arm.com> <065853f5-b11b-4316-814e-202f07acb6ea@oss.qualcomm.com> <20260626103015.GE575984@e132581.arm.com> <20260626154949.GA1812158@e132581.arm.com> <9432df20-08bf-4134-b4b9-e6b5d618af81@oss.qualcomm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9432df20-08bf-4134-b4b9-e6b5d618af81@oss.qualcomm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260629_072854_595666_6404CE70 X-CRM114-Status: GOOD ( 15.43 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Jun 29, 2026 at 10:08:17AM +0800, Jie Gan wrote: [...] > Can I fix the issue by adding "arm,primecell-periphid" property. That's > would be the best temp solution as it avoids breaking the original design of > both the TraceNoC AMBA driver and interconnect TraceNoC platform driver. Before proceeding with the "arm,primecell-periphid" property, could you clarify a bit: - For an interconnect TraceNoC, what would be the consequence of enabling ATID? Would it simply be a no-op, or are there any side effects? Or is the concern that the trace IDs could be exhausted? - How can you guarantee that a interconnect TraceNoC will never require ATID in the future? > The TraceNoC device here must be treated as an AMBA device and I am > continuing to investigate the issue with our hardware team. > We aim to fix it from hardware perspetive for existing platforms if possible > and ensure it is fixed in future platforms. I'm concerned that all of use end up repeatedly fixing similar issues whenever hardware configurations change or modules are reused in different topologies. For example, if future platforms may require ATID support for an interconnect TraceNoC, then the issue will pop up again. Thanks, Leo