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Mon, 27 Jul 2026 07:02:44 -0700 (PDT) Received: from hu-krichai-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13e6054598asm13789423c88.1.2026.07.27.07.02.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Jul 2026 07:02:43 -0700 (PDT) From: Krishna Chaitanya Chundru Subject: [PATCH v6 0/3] PCI/ASPM: Mask ASPM states based on Devicetree properties Date: Mon, 27 Jul 2026 19:32:35 +0530 Message-Id: <20260727-aspm-v6-0-2ebb3ee7ef71@oss.qualcomm.com> 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: 7bit X-B4-Tracking: v=1; b=H4sIAPtkZ2oC/3XPTW7DIBAF4KtErEsEY4afrHqPqosBQ0NVx6lJr FaR714cJ0oW9QbpSe97Iy6sxCHHwnabCxvimEvuDzXolw0Lezp8RJ7bmhkI0EKB41SOHW8JkVC BcVGxWj0OMeWf68zb+5LL2X/GcJrt3NjncuqH3+udUc69ZRKlXCZHySX3ilyKDjEk99qXsv0+0 1fou25bHzYvj/CwGtTNQrVWCFISpaeGVmzzsEbcbVOtRAPSUEpGpxWrnq25WVVtq3Wy6A1YL1Y sPlm4/xerRWu1CMq2Iph/7DRNfz6QJNChAQAA X-Change-ID: 20260429-aspm-da55a54279e4 To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, mani@kernel.org, Krishna Chaitanya Chundru X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; 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(sashiko) - Move from pcie_capability_write_word to pcie_capability_clear_and_set_word (Sashiko) - Link to v5: https://patch.msgid.link/20260721-aspm-v5-1-58860c48d0c7@oss.qualcomm.com Changes in v5: - update all the child devices when enabling the ASPM back (sashiko). - Link to v4: https://patch.msgid.link/20260707-aspm-v4-1-d66f85b728b0@oss.qualcomm.com Changes in v4: - Clear link->aspm_enabled alongside aspm_support/aspm_default when an ASPM state is masked, so it no longer goes stale relative to hardware (sashiko). - Mask the LNKCTL restore snapshot against the post-override aspm_support so the restore step can no longer re-enable a state the Devicetree override just disabled. (sashiko) - Link to v3: https://patch.msgid.link/20260704-aspm-v3-1-157217aff76f@oss.qualcomm.com Changes in v3: - Move pcie_aspm_override_default_link_state() call in pcie_aspm_cap_init() to before the "Restore L0s/L1" block. pcie_aspm_cap_init() disables L1 in hardware prior to aspm_l1ss_init() and re-enables it only in the restore block. Calling pcie_config_aspm_l1ss() while L1 is already disabled satisfies its precondition ("Caller must disable L1 first"), whereas the previous placement after the restore violated it (sashiko). - Link to v2: https://patch.msgid.link/20260624-aspm-v2-1-800a4151ba3a@oss.qualcomm.com Changes in v2: - Disable L1ss when L1 is disabled as pointed by sashiko. - Disable L1ss if bootloader enables them but we are disabling via devicetree pointed by sashiko. - Link to v1: https://patch.msgid.link/20260511-aspm-v1-1-b4a9fe955cf9@oss.qualcomm.com --- Krishna Chaitanya Chundru (3): PCI/ASPM: Use pcie_capability_clear_and_set_word() for ASPM disable/restore PCI/ASPM: Disable/restore ASPM on every function for multi-function devices PCI/ASPM: Mask ASPM states based on Devicetree properties drivers/pci/pcie/aspm.c | 149 +++++++++++++++++++++++++++++++++--------------- 1 file changed, 102 insertions(+), 47 deletions(-) --- base-commit: f5098b6bae761e346ebcd9da7f95622c04733cff change-id: 20260429-aspm-da55a54279e4 Best regards, -- Krishna Chaitanya Chundru