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Wed, 02 Sep 2026 01:44:04 -0700 (PDT) X-Received: by 2002:a05:622a:115:b0:52d:9a83:419d with SMTP id d75a77b69052e-53036992976mr22276031cf.0.1788338643648; Wed, 02 Sep 2026 01:44:03 -0700 (PDT) Received: from [192.168.202.12] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6a67f895e14sm673780a12.3.2026.09.02.01.43.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Sep 2026 01:44:02 -0700 (PDT) Message-ID: <8c2eaba0-c1bd-4db0-bbc8-5ae3b3d9a13c@oss.qualcomm.com> Date: Wed, 2 Sep 2026 10:43:56 +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 1/6] PCI: of: Avoid config reads for disabled bridge nodes To: Xilin Wu , Bjorn Helgaas , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , Bartosz Golaszewski , Linus Walleij Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-gpio@vger.kernel.org, Stephen Chen , Junhao Xie References: <20260901-q8b-dts-v1-0-7de0b6a73d08@radxa.com> <20260901-q8b-dts-v1-1-7de0b6a73d08@radxa.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260901-q8b-dts-v1-1-7de0b6a73d08@radxa.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTAyMDA3NiBTYWx0ZWRfXyo6H3cXcnEYt hwCbc7bQ73EstkU8AxR4YTTgfafdYHEdov4vGPvsULEBjn9AEhnwkB3tGXMKx0eah7u8gED4yv5 ZKamsPs+bTfsGqKDWA0Ob6xn9LufHE8jR77dUNpmgGPctG1i6ZmGUbe/J0KFasdHwmOs2TzVVnr Zs5N/nP2SLhOlw3Rgmkuuf1YOBHJkE2z36LJod0TYtv+qrVuxq50JT9k5cIEALTWPop6w0A1tMb uVYN0ZRxZ13fdVIfs0FJmJLDASFrUJfP6Kzj60KlW8P4/g+Xh1tTqsDQj04IkQsKJ1aCiGwgjvk yVC3jT/ATRgPwGIYBhepPvhiGbyD1fKDuXtOsMR03WtWzJ+ynjbLsb7FhJhS/jCQHxH5cZf4Ix1 ieh1fc0UEUfKDhDd4qVFOAYA/CA0mzseT212Ac4GLRjoXp7epvIlNmY95OWVUM58MablfMpBjsA pS3h714FAbXrBaWZmSA== X-Proofpoint-GUID: _vu6CjPIq9MnKpPJaBXSjtmDFrM_PeiK X-Authority-Analysis: v=2.4 cv=D8N37PRj c=1 sm=1 tr=0 ts=6a97e1d4 cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=i7MDaAbus5dcvw8aKywA:9 a=QEXdDO2ut3YA:10 a=kacYvNCVWA4VmyqE58fU:22 X-Proofpoint-ORIG-GUID: _vu6CjPIq9MnKpPJaBXSjtmDFrM_PeiK X-Proofpoint-Spam-Info: AW1haW4tMjYwOTAyMDA3NiBTYWx0ZWRfX4aWt6ORgTj/v e2GUOPx4wlBg7D23vwiouhlCxzbcfjU2Ejc8bz0RpavqD8907o/Qr5dq2fHyyjgoZLHxXVLqA48 gprn6E5olHT8dYmJ0wMFx60WgQ+mXjk= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-02_01,2026-09-01_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 lowpriorityscore=0 spamscore=0 phishscore=0 adultscore=0 malwarescore=0 clxscore=1015 impostorscore=0 priorityscore=1501 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609020076 On 9/1/26 10:47 AM, Xilin Wu wrote: > The TC9563 PCI power-control driver powers off external downstream ports > whose device tree nodes have status = "disabled". > > On the Radxa Dragon Q8B, reading the Vendor ID from one of these > powered-off port functions during PCI enumeration raises an Arm SError > instead of returning an all-ones PCI error response. This prevents the > board from completing boot. I agree with the premise of the patch, but I'd like to understand why that happens - do you have any details? Konrad