PCI: tegra194: Disable LTSSM after transition to Detect on surprise link down

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[ Upstream commit 9fa0c242f8 ]

After the link reaches a Detect-related LTSSM state, disable LTSSM so it
does not keep toggling between Polling and Detect. Do this by polling for
the Detect state first, then clearing APPL_CTRL_LTSSM_EN in both
tegra_pcie_dw_pme_turnoff() and pex_ep_event_pex_rst_assert().

Fixes: 56e15a238d ("PCI: tegra: Add Tegra194 PCIe support")
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
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>
Link: https://patch.msgid.link/20260324190755.1094879-4-mmaddireddy@nvidia.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Manikanta Maddireddy 2026-03-25 00:37:44 +05:30 • committed by Greg Kroah-Hartman

parent b31250b8a8

commit 15947c862f

1 changed files with 16 additions and 13 deletions

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drivers/pci/controller/dwc/pcie-tegra194.c

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