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Mon, 01 Jun 2026 14:59:32 -0700 (PDT) Date: Mon, 1 Jun 2026 21:59:07 +0000 In-Reply-To: <20260601215909.3958732-1-praan@google.com> Mime-Version: 1.0 References: <20260601215909.3958732-1-praan@google.com> X-Mailer: git-send-email 2.54.0.1013.g208068f2d8-goog Message-ID: <20260601215909.3958732-11-praan@google.com> Subject: [PATCH v8 10/12] iommu/arm-smmu-v3: Enable pm_runtime and setup devlinks From: Pranjal Shrivastava To: iommu@lists.linux.dev Cc: Will Deacon , Joerg Roedel , Robin Murphy , Jason Gunthorpe , Mostafa Saleh , Nicolin Chen , Daniel Mentz , Ashish Mhetre , linux-arm-kernel@lists.infradead.org, Pranjal Shrivastava Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260601_225936_001014_F9113A4A X-CRM114-Status: GOOD ( 12.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Enable PM runtime for SMMUs having a power-domain during smmu probe. Add a devlink between the clients and SMMU device. The absence of a power domain effectively disables runtime power management. Reviewed-by: Mostafa Saleh Reviewed-by: Nicolin Chen Signed-off-by: Pranjal Shrivastava --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 542de3a3173a..24a1bcc8974f 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -4243,6 +4243,9 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev) pci_prepare_ats(to_pci_dev(dev), stu); } + device_link_add(dev, smmu->dev, + DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER); + return &smmu->iommu; err_free_master: @@ -5607,6 +5610,13 @@ static int arm_smmu_device_probe(struct platform_device *pdev) goto err_free_sysfs; } + if (dev->pm_domain) { + pm_runtime_set_active(dev); + pm_runtime_use_autosuspend(dev); + pm_runtime_set_autosuspend_delay(dev, RPM_AUTOSUSPEND_DELAY_MS); + pm_runtime_enable(dev); + } + return 0; err_free_sysfs: -- 2.54.0.1013.g208068f2d8-goog