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PCI: tegra194: Disable PERST# IRQ only in Endpoint mode

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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: c57247f940 ("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
This commit is contained in:
Manikanta Maddireddy
2026-03-25 00:37:46 +05:30
committed by Bjorn Helgaas
parent 71d9f67701
commit 40658a31b6
1 changed files with 2 additions and 1 deletions
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3
drivers/pci/controller/dwc/pcie-tegra194.c
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@@ -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 = {