diff options
| author | Manikanta Maddireddy <mmaddireddy@nvidia.com> | 2026-03-24 22:07:46 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2026-04-09 00:56:44 +0300 |
| commit | 40658a31b6e134169c648041efc84944c4c71dcd (patch) | |
| tree | 7cb483b43a34a6e3f8fd0681e41e326a40e15f36 | |
| parent | 71d9f67701e1affc82d18ca88ae798c5361beddf (diff) | |
| download | linux-40658a31b6e134169c648041efc84944c4c71dcd.tar.xz | |
PCI: tegra194: Disable PERST# IRQ only in Endpoint mode
The PERST# GPIO interrupt is only registered when the controller is
operating in Endpoint mode. In Root Port mode, the PERST# GPIO is
configured as an output to control downstream devices, and no interrupt is
registered for it.
Currently, tegra_pcie_dw_stop_link() unconditionally calls disable_irq()
on pex_rst_irq, which causes issues in Root Port mode where this IRQ is
not registered.
Fix this by only disabling the PERST# IRQ when operating in Endpoint mode,
where the interrupt is actually registered and used to detect PERST#
assertion/deassertion from the host.
Fixes: c57247f940e8 ("PCI: tegra: Add support for PCIe endpoint mode in Tegra194")
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
Link: https://patch.msgid.link/20260324190755.1094879-6-mmaddireddy@nvidia.com
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-tegra194.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index c84eb1ba3a11..ceb34110a50b 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1025,7 +1025,8 @@ static void tegra_pcie_dw_stop_link(struct dw_pcie *pci) { struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); - disable_irq(pcie->pex_rst_irq); + if (pcie->of_data->mode == DW_PCIE_EP_TYPE) + disable_irq(pcie->pex_rst_irq); } static const struct dw_pcie_ops tegra_dw_pcie_ops = { |