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{ "id": 2229447, "url": "http://patchwork.ozlabs.org/api/1.1/covers/2229447/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/cover/20260428-t_power_on_fux-v5-0-f1ef926a91ff@oss.qualcomm.com/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/1.1/projects/28/?format=api", "name": "Linux PCI development", "link_name": "linux-pci", "list_id": "linux-pci.vger.kernel.org", "list_email": "linux-pci@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null }, "msgid": "<20260428-t_power_on_fux-v5-0-f1ef926a91ff@oss.qualcomm.com>", "date": "2026-04-28T08:37:14", "name": "[v5,0/3] PCI: qcom: Program T_POWER_ON value for L1.2 exit timing", "submitter": { "id": 89908, "url": "http://patchwork.ozlabs.org/api/1.1/people/89908/?format=api", "name": "Krishna Chaitanya Chundru", "email": "krishna.chundru@oss.qualcomm.com" }, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/cover/20260428-t_power_on_fux-v5-0-f1ef926a91ff@oss.qualcomm.com/mbox/", "series": [ { "id": 501799, "url": "http://patchwork.ozlabs.org/api/1.1/series/501799/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=501799", "date": "2026-04-28T08:37:15", "name": "PCI: qcom: Program T_POWER_ON value for L1.2 exit timing", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/501799/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2229447/comments/", "headers": { "Return-Path": "\n <linux-pci+bounces-53312-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pci@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=J4E2VkR4;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=ieaSO7Pi;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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charset=\"utf-8\"", "Content-Transfer-Encoding": "8bit", "X-B4-Tracking": "v=1; b=H4sIALtx8GkC/3XPQQrCMBAF0KtI1qZkJmliXHkPkWLTRAPaaKJVk\n d7dtCBdaDcDf+A/Zt4k2ehtIuvFm0Tb+eRDm0O5XBBz3LcHS32TM0GGJQAT9FZdwsPGKrSVuz+\n pYo2RK66UFkBy6RKt888R3O5yPvp0C/E1+h0M21mqAwrU1qUGaYVyjdqElIrrfX8y4Xwu8iCD2\n OFXkQyR/yhIGUVmNAJKVEzPKHxSOMCPwrOia3DQMG2k4zOKmBTx5yMx3LLSwDWAUk78Ufq+/wB\n KE8lXhQEAAA==", "X-Change-ID": "20251104-t_power_on_fux-70dc68377941", "To": "Manivannan Sadhasivam <mani@kernel.org>,\n Lorenzo Pieralisi <lpieralisi@kernel.org>, =?utf-8?q?Krzysztof_Wilczy=C5=84?=\n\t=?utf-8?q?ski?= <kwilczynski@kernel.org>, Rob Herring <robh@kernel.org>,\n Bjorn Helgaas <bhelgaas@google.com>, Jingoo Han <jingoohan1@gmail.com>", "Cc": "linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org,\n linux-kernel@vger.kernel.org, mayank.rana@oss.qualcomm.com,\n quic_vbadigan@quicinc.com,\n Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>,\n Shawn Lin <shawn.lin@rock-chips.com>", "X-Mailer": "b4 0.15.2", "X-Developer-Signature": "v=1; a=ed25519-sha256; t=1777365442; l=3469;\n i=krishna.chundru@oss.qualcomm.com; s=20230907; h=from:subject:message-id;\n bh=wXhxA72/6Ld66K/KfOL/i5XxZJ6shIPA05fxN6UAC4Q=;\n b=tWGrEv2tB5pw9iHEmovC108r0+9mTrwl7muAR9VjtpOp4TcvFVd9LlGZF87A8EpmIBIUrL488\n 1xKKaM/DijYCVzVbNrE5CVS6q1TRQ3eqT1Ph+lSZYBgw0atwFsxgy20", "X-Developer-Key": "i=krishna.chundru@oss.qualcomm.com; a=ed25519;\n pk=10CL2pdAKFyzyOHbfSWHCD0X0my7CXxj8gJScmn1FAg=", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDI4MDA3OSBTYWx0ZWRfXzo1la7i5ycnV\n cKkU3hIUeCcrEdA7h3SL3x6pipsZxjnF95B5uw7i3FNQ9L6B1G9HVs7Nrd3y70Vu6oDSLkV9gRk\n 2hoMHyYByEaeyxialneANqwOIbTp9eqn8BOpLyq3OY2MsHsgICRAUnCaor0ZdLLuF8Ak0sIIzP1\n zHHvk0sIFUEOYt5+8J7PRCsTmWU9r4u7JZ6o+RHqMasff2pkSlGpdccyw0EKCpL7MflQymA8viq\n a7M5NoNgbjr/kLrk45ghb3qqbP8g98cERn4Tj08XlANsAn5D0jfKxr1fj+r5tc3gPORqU+Z7C9q\n mu7Xpey689ysGcnU2GZ4qtzmAIPWGyhEFsB1j+42LFsX1hEg9N8wptYBHKmEty/PquptX2c+mJ7\n 39+lXvSXBxQs8z3k3eZV0dptLJcb6j8lxtaPkE9+oIqa1cNpV6MPGiqPbNxlZQovgqZKA4eLqQo\n +GoXkHnEc41KAt7ZE9w==", "X-Proofpoint-ORIG-GUID": "HY26_7l3_hc72KhgpmUcuyqijnEaifCA", "X-Authority-Analysis": "v=2.4 cv=AJEsYPsu c=1 sm=1 tr=0 ts=69f071c8 cx=c_pps\n a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17\n a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10\n a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22\n a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=1XWaLZrsAAAA:8 a=pGLkceISAAAA:8\n a=h7GK-HNMy1QVH8K1SrQA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10\n a=GvdueXVYPmCkWapjIL-Q:22", "X-Proofpoint-GUID": "HY26_7l3_hc72KhgpmUcuyqijnEaifCA", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-28_02,2026-04-21_02,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n phishscore=0 impostorscore=0 priorityscore=1501 suspectscore=0 bulkscore=0\n malwarescore=0 adultscore=0 lowpriorityscore=0 clxscore=1015 spamscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604280079" }, "content": "The T_POWER_ON indicates the time (in μs) that a Port requires the port\non the opposite side of Link to wait in L1.2.Exit after sampling CLKREQ#\nasserted before actively driving the interface. This value is used by\nthe ASPM driver to compute the LTR_L1.2_THRESHOLD.\n\nCurrently, qcom root port exposes T_POWER_ON value of zero in the L1SS\ncapability registers, leading to incorrect LTR_L1.2_THRESHOLD calculations,\nwhich can result in improper L1.2 exit behavior and can trigger AER's.\n\nIn this series, qcom controller drivers read the devicetree property\n\"t-power-on\" which got merged recently[1], and use that value to over\nwrite default/wrong value.\n\nTo convert T_POWER_ON in to T_POWER_ON_SCALE & T_POWER_ON_VALUE created\na pcie_encode_t_power_on() helper in aspm.c and also created\ndw_pcie_program_t_power_on() helper for other drivers to use these\nhelpers.\n\nLink [1]: https://lore.kernel.org/all/20260205093346.667898-1-krishna.chundru@oss.qualcomm.com/\n\nSigned-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>\n---\nChanges in v5:\n- Initialize *scale & *value to zero incase of ASPM is disabled pointed\n by sashiko.\n- Use dwc readl & writel API's instead of direct readl & writel pointed\n by sashiko\n- couple of nits (Mani).\n- Link to v4: https://lore.kernel.org/r/20260404-t_power_on_fux-v4-0-2891391177f4@oss.qualcomm.com\n\nChanges in v4:\n- calculate maxv from PCI_L1SS_CTL2_T_PWR_ON_VALUE to PCI_L1SS_CAP_P_PWR_ON_VALUE (Mani).\n- added a todo to move the reading the devicetree from qcom driver to\n dwc once multi root port parsing support is added (Mani).\n- Link to v3: https://lore.kernel.org/r/20260311-t_power_on_fux-v3-0-9b1f1d09c6f3@oss.qualcomm.com\n\nChanges in v3:\n- move pcie_encode_t_power_on() include/linux/pci.h to\n drivers/pci/pci.h (Bjorn).\n- couple of changes in commit text and variable name like t_power_on (Bjorn).\n- remove return 0 from qcom_pcie_configure_ports (Bjorn).\n- used FIELD_MODIFY instead of FIELD_PREP (Bjorn).\n- Link to v2: https://lore.kernel.org/r/20260223-t_power_on_fux-v2-0-20c921262709@oss.qualcomm.com\n\nChanges in v2:\n- Instead of hard coding the values in the driver, created a devicetree\n property \"t-power-on\" to program it (Bjorn & Mani).\n- Link to v1: https://lore.kernel.org/r/20251104-t_power_on_fux-v1-1-eb5916e47fd7@oss.qualcomm.com\n\nTo: Bjorn Helgaas <bhelgaas@google.com>\nTo: Jingoo Han <jingoohan1@gmail.com>\nTo: Manivannan Sadhasivam <mani@kernel.org>\nTo: Lorenzo Pieralisi <lpieralisi@kernel.org>\nTo: Krzysztof Wilczyński <kwilczynski@kernel.org>\nTo: Rob Herring <robh@kernel.org>\nCc: linux-pci@vger.kernel.org\nCc: linux-kernel@vger.kernel.org\nCc: linux-arm-msm@vger.kernel.org\n\n---\nKrishna Chaitanya Chundru (3):\n PCI/ASPM: Add helper to encode L1SS T_POWER_ON fields\n PCI: dwc: Add helper to Program T_POWER_ON\n PCI: qcom: Program T_POWER_ON\n\n drivers/pci/controller/dwc/pcie-designware.c | 28 +++++++++++++++++++\n drivers/pci/controller/dwc/pcie-designware.h | 1 +\n drivers/pci/controller/dwc/pcie-qcom.c | 14 ++++++++++\n drivers/pci/pci.h | 6 +++++\n drivers/pci/pcie/aspm.c | 40 ++++++++++++++++++++++++++++\n 5 files changed, 89 insertions(+)\n---\nbase-commit: 3b3bea6d4b9c162f9e555905d96b8c1da67ecd5b\nchange-id: 20251104-t_power_on_fux-70dc68377941\n\nBest regards,\n-- \nKrishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>" }