On 10/11/2024 8:50 PM, Manivannan Sadhasivam wrote:
On Fri, Oct 11, 2024 at 04:55:30PM -0700, Mayank Rana wrote:
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
WARN_ON as "Enabling runtime PM for inactive device with active children".
"to avoid seeing the below warning from PM core:
pcie-starfive 940000000.pcie: Enabling runtime PM for inactive device
with active children"
ACK
Fix this issue by enabling starfive pcie controller device's runtime PM
before calling into pci_host_probe() through plda_pcie_host_init().
"before calling pci_host_probe() in plda_pcie_host_init()"
ACK
Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Mayank Rana <quic_mrana@xxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
- Mani
---
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@xxxxxxxxxxx/
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 0567ec373a3e..e73c1b7bc8ef 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;
--
2.25.1
Regards,
Mayank
