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Fri, 15 May 2026 09:52:37 -0700 (PDT) Received: from [192.168.1.11] ([120.60.141.122]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2bd5cfe49a4sm58330965ad.38.2026.05.15.09.52.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 May 2026 09:52:36 -0700 (PDT) From: Manivannan Sadhasivam X-Google-Original-From: Manivannan Sadhasivam To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas , Jingoo Han , Krishna Chaitanya Chundru Cc: linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, mayank.rana@oss.qualcomm.com, quic_vbadigan@quicinc.com, Shawn Lin In-Reply-To: <20260428-t_power_on_fux-v5-0-f1ef926a91ff@oss.qualcomm.com> References: <20260428-t_power_on_fux-v5-0-f1ef926a91ff@oss.qualcomm.com> Subject: Re: [PATCH v5 0/3] PCI: qcom: Program T_POWER_ON value for L1.2 exit timing Message-Id: <177886395239.8489.6933092111755683572.b4-ty@kernel.org> Date: Fri, 15 May 2026 22:22:32 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-Mailer: b4 0.14.3 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTE1MDE3MSBTYWx0ZWRfX8MH3JZhMEdCW JmzDXblYAsqdLEHTJ6QWutISFQjzF6s8+ULZetoD1utKLRrypDD9g/NRYG7yPNguR6q0Jfdkkag /PtlG4VfB2Sii9g4M0qoCXXqjSmGAzWElQcYBD6jfP/5DRDkJ3r4fe1EVmt3jceBrVxAdG6gVql ONBqOrsPgWY4ZTqn62wCrPWt4zLQ7PGr9NX5u9MGl/iPSmpRBInxNKdfDemjHr7YF4SURE34If9 g4+ocNQR7km9SX0HP6TQHXSKXVcjCYW6NWydlN7jNwC6fnMLNkH79Q8ThZplKVvlSVSncGx71SJ cRIXn1AEP5/eWPuZ3+00Z1ZcsdhEQoPsWc41tERXQ2KzAuIPVOQJ8wiyOVIIxvX4RT6Ik1Is1fy aB4OSSBDobBSc2ec2JQ2BtiZAiYncX2v8n1i/Ku9197jrXf5mjMQN7JOMppQUjBcDuOGEEoPoia FYJaXEh2foChcD/8+3Q== X-Authority-Analysis: v=2.4 cv=boZ8wkai c=1 sm=1 tr=0 ts=6a074f56 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=8TBCxnFsifAbGBbxUCxq8g==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=VwQbUJbxAAAA:8 a=ktJZ1PKzIPGet9XSW-IA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-GUID: LnGfu7HYnL2sc41kWOfl2aHtMt4snf_a X-Proofpoint-ORIG-GUID: LnGfu7HYnL2sc41kWOfl2aHtMt4snf_a X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-15_04,2026-05-15_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 adultscore=0 clxscore=1015 impostorscore=0 spamscore=0 priorityscore=1501 bulkscore=0 phishscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605150171 On Tue, 28 Apr 2026 14:07:14 +0530, Krishna Chaitanya Chundru wrote: > The T_POWER_ON indicates the time (in μs) that a Port requires the port > on the opposite side of Link to wait in L1.2.Exit after sampling CLKREQ# > asserted before actively driving the interface. This value is used by > the ASPM driver to compute the LTR_L1.2_THRESHOLD. > > Currently, qcom root port exposes T_POWER_ON value of zero in the L1SS > capability registers, leading to incorrect LTR_L1.2_THRESHOLD calculations, > which can result in improper L1.2 exit behavior and can trigger AER's. > > [...] Applied, thanks! [1/3] PCI/ASPM: Add helper to encode L1SS T_POWER_ON fields commit: ea803322d3a8ec4ba60699a21b4ddc8fdbc0a242 [2/3] PCI: dwc: Add helper to Program T_POWER_ON commit: a66a25538564850a977ee3cfc795aa05ac4f1700 [3/3] PCI: qcom: Program T_POWER_ON commit: fca5f83fa339b357311ed250ec8041bbae11f66d Best regards, -- Manivannan Sadhasivam