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Fri, 10 Jul 2026 02:50:04 -0700 (PDT) X-Received: by 2002:ac8:7dd2:0:b0:51c:f3e:781e with SMTP id d75a77b69052e-51c967ad1c5mr64466581cf.6.1783677004229; Fri, 10 Jul 2026 02:50:04 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-69a19ce4b4fsm10518512a12.10.2026.07.10.02.49.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jul 2026 02:50:02 -0700 (PDT) Message-ID: <8870479a-7ff9-40cf-8298-1cfb98d1b896@oss.qualcomm.com> Date: Fri, 10 Jul 2026 11:49:59 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 4/5] arm64: dts: qcom: sm8750: bind traceNoC on the platform bus 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: <20260710-fix-tracenoc-probe-issue-v6-0-41eb36fef8d9@oss.qualcomm.com> <20260710-fix-tracenoc-probe-issue-v6-4-41eb36fef8d9@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260710-fix-tracenoc-probe-issue-v6-4-41eb36fef8d9@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=Ab2B2XXG c=1 sm=1 tr=0 ts=6a50c04d cx=c_pps a=JbAStetqSzwMeJznSMzCyw==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=gkVCdKvAZl3yu2NoW_gA:9 a=QEXdDO2ut3YA:10 a=uxP6HrT_eTzRwkO_Te1X:22 X-Proofpoint-ORIG-GUID: 7t-Bsh_J0BNARgYMB9wJ7MXQHdL65Hi9 X-Proofpoint-GUID: 7t-Bsh_J0BNARgYMB9wJ7MXQHdL65Hi9 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzEwMDA5NiBTYWx0ZWRfX33J0g5wsgisP OT283hx3aYJ6vDwNndiqLN1vdz00G4eu7u73HMEqx/D7juLw/VB2jNFeDvEukpAQ0g+ibx9sPGI YSLUKHvGPeGOPyB4WyDcMAHiyumpStc= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzEwMDA5NiBTYWx0ZWRfX/v9WO5+b0K5K sgc9YDPKGDjNBmid5nFmc6jSdnx0Ouy/9QRPuL3UqvYDvrjRbLA+MxcaOxI7PbXBJB7ICk+sqzE jEM4Vk0S4i924k8xQsLytNcBFoCiJ+rk0tI3dQG14PSP9aJLsQlj3wadA7R5DS4Z4Y2go+xSa9V lwEp+ItmQZq1sGGOs1UcDn6vBDZLjHtycxzGhiod+ZRorv99AOl52J1EOOpvegYFOMRVRlo4Nga pVMvbcTtoTFvs10qcQXxdAwqgSoznOlq9dAUgseqir04xY8qUh9EK/XDcPIuobflT/UYD63cBCA TAATmQfquQVBy4zmX+yl0t+p5pi4BlildnIuNbBr8VeB9zv1Lcb8QJwImx9WRq6LhQWubS8SeF1 tH8HHCt75ttKg0LOIIZ66zLUjeUAtwiZuFm9gc/ociaa2LL2kh0PQiySw3++GDT7tPqW8RzJLNi Fcb4nlDHc01PEH8rYng== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-10_02,2026-07-09_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 clxscore=1015 malwarescore=0 phishscore=0 bulkscore=0 suspectscore=0 impostorscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607100096 On 7/10/26 4:39 AM, Jie Gan wrote: > The traceNoC node used the "qcom,coresight-tnoc", "arm,primecell" > compatible, which places the device on the AMBA bus. To bind an AMBA > device, the bus reads the peripheral and component ID registers (PID/CID) > at the top of the device's register block and matches them against the > primecell ID. The traceNoC exposes the CID registers, but the Component ID > value returned by the hardware is 0x00000000 instead of a valid AMBA > Component ID, so the match never succeeds, the AMBA probe fails, and the > device is left stuck in deferred probe indefinitely. > > Drop the "arm,primecell" entry and use the standalone "qcom,coresight-tnoc" > compatible, which binds via the platform driver by compatible string and > does not rely on the component ID register at all. This lets the device > probe on hardware that does not return a valid CID, while remaining an > Aggregator TNOC that retains ATID functionality. > > Fixes: ebd1eb365cae ("arm64: qcom: dts: sm8750: add coresight nodes") > Signed-off-by: Jie Gan > --- Reviewed-by: Konrad Dybcio Konrad