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Tue, 30 Jun 2026 05:53:56 -0700 (PDT) X-Received: by 2002:a05:622a:120f:b0:50b:3489:5495 with SMTP id d75a77b69052e-51c10894a12mr32760741cf.8.1782824035970; Tue, 30 Jun 2026 05:53:55 -0700 (PDT) Received: from [192.168.120.170] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c1288d1ea70sm121297366b.3.2026.06.30.05.53.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Jun 2026 05:53:55 -0700 (PDT) Message-ID: Date: Tue, 30 Jun 2026 14:53:53 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 3/5] arm64: dts: qcom: kaanapali: fix traceNoC probe issue To: Jie Gan , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Tingwei Zhang , Jingyi Wang , Abel Vesa , Suzuki K Poulose , Mike Leach , James Clark , Leo Yan , Yuanfang Zhang , Abel Vesa , Alexander Shishkin Cc: 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 References: <20260630-fix-tracenoc-probe-issue-v3-0-7201e1841e94@oss.qualcomm.com> <20260630-fix-tracenoc-probe-issue-v3-3-7201e1841e94@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260630-fix-tracenoc-probe-issue-v3-3-7201e1841e94@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: jHRvzt1cI3SlDG8U9GxFZiIsqpziL4yf X-Authority-Analysis: v=2.4 cv=KqJ9H2WN c=1 sm=1 tr=0 ts=6a43bc65 cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=keZN38YVYYl-MFWHEpsA:9 a=QEXdDO2ut3YA:10 a=kacYvNCVWA4VmyqE58fU:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjMwMDEyMCBTYWx0ZWRfX6L0ea1cuPj6R NKCUDA3yKhNn5zfNxyx2Bmn/4z9KTtyo5rqOJqgMPIBOridPEKHSG9gMmbhymYVtNK3Mao9wMUI 02pHIHdg4dHfa0awIRTxFqGKrFBNT3HVBPPKIiRq9iv9Q9/crurRGfgxUaRpx84Sun5SByzHG1n yf/gABaVBDxnUHa1bKA/GPWzSkbfxMagDaDhpmuPZ/UbAb0pO1xQIrpv+j5+8mDScqCrvQPGWLG uHQ3AtZD27FfTWrMFpzkQKG0oQxRILKXwwYPtzWMi+cpT99Z4eqfYJk7X+y9phqytBUtkLfuFsz lzl4up+4/ZQXrV/q262rdC03XPM+6b+dU7ZkqkM/DVeGhy7iV0i9kdQyS32yf3ElVdxcZ7W1AL9 0lN8PctbpbUcquvZuL8YzUR+rQml9NNLtKSR4aTtRGdcmCAwazdJHBWVVqEVc0hqKNrJpVILUQ9 K6BLA4BcEVg92329rvQ== X-Proofpoint-ORIG-GUID: jHRvzt1cI3SlDG8U9GxFZiIsqpziL4yf X-Proofpoint-Spam-Info: AW1haW4tMjYwNjMwMDEyMCBTYWx0ZWRfXxkO5VZdO1kbn SIy81ijuFcqFwEjHK+s3wujlwiszfyHLeEXkAKA8HBbAp3TGRibJ4VEIy53FL6qCPdHOrS8MQAR 62Xijh1dmEhks+mg2lo6wsW+LQZsi7M= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-30_03,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 clxscore=1015 suspectscore=0 spamscore=0 phishscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606300120 On 6/30/26 12:36 PM, Jie Gan wrote: > The traceNoC node used the "qcom,coresight-tnoc", "arm,primecell" > compatible, which places the device on the AMBA bus. The AMBA peripheral > ID probing fails on this platform, so the device never probes. An interested reader would immediately expect an answer to why that's the case > Switch the node to the standalone "qcom,coresight-agtnoc" compatible. > Dropping "arm,primecell" makes the device probe through the platform > driver instead of the AMBA bus, which resolves the probe failure while > keeping it an Aggregator TNOC that retains ATID functionality. This describes OS behavior. Move your message towards the other compatible not depending on reading that ID register. Konrad