linux-kernel - [PATCH AUTOSEL 6.12 08/15] PCI: starfive: Enable controller runtime PM before probing host bridge

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Message-ID: <20241204160010.2216008-8-sashal@kernel.org>
Date: Wed,  4 Dec 2024 10:59:56 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Mayank Rana <quic_mrana@...cinc.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Sasha Levin <sashal@...nel.org>,
	kevin.xie@...rfivetech.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	linux-pci@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 08/15] PCI: starfive: Enable controller runtime PM before probing host bridge

From: Mayank Rana <quic_mrana@...cinc.com>

[ Upstream commit 6168efbebace0db443185d4c6701ca8170a8788d ]

A PCI controller device, e.g., StarFive, is parent to PCI host bridge
device. We must enable runtime PM of the controller before enabling runtime
PM of the host bridge, which will happen in pci_host_probe(), to avoid this
warning:

  pcie-starfive 940000000.pcie: Enabling runtime PM for inactive device with active children

Fix this issue by enabling StarFive controller device's runtime PM before
calling pci_host_probe() in plda_pcie_host_init().

Link: https://lore.kernel.org/r/20241111-runtime_pm-v7-1-9c164eefcd87@quicinc.com
Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Mayank Rana <quic_mrana@...cinc.com>
[bhelgaas: commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/controller/plda/pcie-starfive.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/plda/pcie-starfive.c b/drivers/pci/controller/plda/pcie-starfive.c
index c9933ecf68338..0564fdce47c2a 100644
--- a/drivers/pci/controller/plda/pcie-starfive.c
+++ b/drivers/pci/controller/plda/pcie-starfive.c
@@ -404,6 +404,9 @@ static int starfive_pcie_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
+
 	plda->host_ops = &sf_host_ops;
 	plda->num_events = PLDA_MAX_EVENT_NUM;
 	/* mask doorbell event */
@@ -413,11 +416,12 @@ static int starfive_pcie_probe(struct platform_device *pdev)
 	plda->events_bitmap <<= PLDA_NUM_DMA_EVENTS;
 	ret = plda_pcie_host_init(&pcie->plda, &starfive_pcie_ops,
 				  &stf_pcie_event);
-	if (ret)
+	if (ret) {
+		pm_runtime_put_sync(&pdev->dev);
+		pm_runtime_disable(&pdev->dev);
 		return ret;
+	}
 
-	pm_runtime_enable(&pdev->dev);
-	pm_runtime_get_sync(&pdev->dev);
 	platform_set_drvdata(pdev, pcie);
 
 	return 0;
-- 
2.43.0