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Wed, 12 Nov 2025 20:04:00 -0800 (PST) X-Google-Smtp-Source: AGHT+IGoFRhJNw42eQuq+D0QE8iC+rBpNLW5HJcqLuc033QSYVpJfp+TOEttapJRjQnS91FE3zxN/A== X-Received: by 2002:a17:903:286:b0:298:8ec:9993 with SMTP id d9443c01a7336-2984edc8d47mr70965115ad.38.1763006639930; Wed, 12 Nov 2025 20:03:59 -0800 (PST) Received: from [10.218.35.45] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2985c2b0c35sm7753505ad.52.2025.11.12.20.03.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 12 Nov 2025 20:03:59 -0800 (PST) Message-ID: <44c7b4a8-33ce-4516-81bf-349b5e555806@oss.qualcomm.com> Date: Thu, 13 Nov 2025 09:33:54 +0530 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 v2] schemas: pci: Document PCIe T_POWER_ON To: Lukas Wunner Cc: andersson@kernel.org, robh@kernel.org, manivannan.sadhasivam@linaro.org, krzk@kernel.org, helgaas@kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, lpieralisi@kernel.org, kw@linux.com, conor+dt@kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree-spec@vger.kernel.org, quic_vbadigan@quicinc.com References: <20251110112947.2071036-1-krishna.chundru@oss.qualcomm.com> Content-Language: en-US From: Krishna Chaitanya Chundru In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTEzMDAyNCBTYWx0ZWRfX5fJThI5kTSaB xtMcebcrJTSDr6dsUHWYNvCGmY8QsnOIAVi8Ol9lSn7KiMEdrmxc9iis3zq1T09v7hpdCq7C4rf QxbP/XXgfhvrFLJN7Cul/py/fStcngi4wyvUCboDsBfyxBUvpAaNJkGoP4DyN+ImaFIIDYHIIYo u8a5MUrsDllXRROfY0m1IIKsZNkkT8F4uOn6B00g6YyK+uKNI2rXW3h+TItDXWLDPOfpudyL5Wk yGIS24Eo/XlHR9nmFo+stRIfLBdnHBHR1ZdJ2tAInGM6oQrK+PBEojeStcZ/pVsqepTaGetk+rQ YCXlDPGiVWt0rwqEomutYmuaWOy0pZf2bTXmQZeuk7HCZgdmIieBi3ZBuZ51oETf26Dy2ZxRh/w Gn8TayZYpXFD8JB+TPaFQcYQOHMRsA== X-Proofpoint-GUID: 8CLZ-P4NmFDCLWXcwzYlNstzRzl2X2AW X-Authority-Analysis: v=2.4 cv=A5Fh/qWG c=1 sm=1 tr=0 ts=691558b1 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=pqN9LwBUSSWNe87m4-kA:9 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-ORIG-GUID: 8CLZ-P4NmFDCLWXcwzYlNstzRzl2X2AW X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-12_06,2025-11-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 priorityscore=1501 clxscore=1015 spamscore=0 phishscore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511130024 On 11/10/2025 6:11 PM, Lukas Wunner wrote: > On Mon, Nov 10, 2025 at 04:59:47PM +0530, Krishna Chaitanya Chundru wrote: >> From PCIe r6, sec 5.5.4 & Table 5-11 in sec 5.5.5 T_POWER_ON is the > Please use the latest spec version as reference, i.e. PCIe r7.0. ack. >> minimum amount of time(in us) that each component must wait in L1.2.Exit >> after sampling CLKREQ# asserted before actively driving the interface to >> ensure no device is ever actively driving into an unpowered component and >> these values are based on the components and AC coupling capacitors used >> in the connection linking the two components. >> >> This property should be used to indicate the T_POWER_ON for each Root Port. > What's the difference between this property and the Port T_POWER_ON_Scale > and T_POWER_ON_Value in the L1 PM Substates Capabilities Register? > > Why do you need this in the device tree even though it's available > in the register? This value is same as L1 PM substates value, some controllers needs to update this value before enumeration as hardware might now program this value correctly[1]. [1]: [PATCH] PCI: qcom: Program correct T_POWER_ON value for L1.2 exit timing - Krishna Chaitanya. > Thanks, > > Lukas