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Thu, 17 Oct 2024 15:36:01 GMT Received: from hu-krichai-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Thu, 17 Oct 2024 08:35:57 -0700 From: Krishna chaitanya chundru Date: Thu, 17 Oct 2024 21:05:50 +0530 Subject: [PATCH v6 1/2] PCI: starfive: Enable PCIe controller's runtime PM before probing host bridge Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20241017-runtime_pm-v6-1-55eab5c2c940@quicinc.com> References: <20241017-runtime_pm-v6-0-55eab5c2c940@quicinc.com> In-Reply-To: <20241017-runtime_pm-v6-0-55eab5c2c940@quicinc.com> To: Kevin Xie , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84?= =?utf-8?q?ski?= , Manivannan Sadhasivam , "Rob Herring" , Bjorn Helgaas CC: , , , , , , , "Krishna chaitanya chundru" X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1729179352; l=2328; i=quic_krichai@quicinc.com; s=20230907; h=from:subject:message-id; bh=LkSUXnpskxUCZXdVOigHiYq2slUxJStDgoZTxaSv+A4=; b=n2vYAjq1ecfh5OficIcWIjMruvqJXJbPO2aCagiY96l+paubKmxLA2SczzeuCMMCWYLJrw4v1 gr6KsYueCJoB5XkIkZgrmINOh31MlQi2Lbzy93eZ7tngj3TVMxZ1ER3 X-Developer-Key: i=quic_krichai@quicinc.com; a=ed25519; pk=10CL2pdAKFyzyOHbfSWHCD0X0my7CXxj8gJScmn1FAg= X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: bKQ5105LXRbzbSTkAg4MAZZdNpfvx5og X-Proofpoint-ORIG-GUID: bKQ5105LXRbzbSTkAg4MAZZdNpfvx5og X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 adultscore=0 mlxscore=0 malwarescore=0 bulkscore=0 spamscore=0 clxscore=1015 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410170107 From: Mayank Rana PCIe controller device (i.e. PCIe starfive device) is parent to PCIe host bridge device. To enable runtime PM of PCIe host bridge device (child device), it is must to enable parent device's runtime PM to avoid seeing the below warning from PM core: pcie-starfive 940000000.pcie: Enabling runtime PM for inactive device with active children Fix this issue by enabling starfive pcie controller device's runtime PM before calling pci_host_probe() in plda_pcie_host_init(). Tested-by: Marek Szyprowski Signed-off-by: Mayank Rana Reviewed-by: Manivannan Sadhasivam --- v3->v6: - no change Link to v3: https://patchwork.kernel.org/project/linux-pci/patch/20241014162607.1247611-1-quic_mrana@quicinc.com/ v2->v3: - Update commit description based on Mani's feedback - Updated Reviewed-by tag Link to v2: https://patchwork.kernel.org/project/linux-pci/patch/20241011235530.3919347-1-quic_mrana@quicinc.com/ v1->v2: Updated commit description based on Bjorn's feedback Link to v1: https://patchwork.kernel.org/project/linux-pci/patch/20241010202950.3263899-1-quic_mrana@quicinc.com/ --- 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 c9933ecf6833..0564fdce47c2 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;