PCI: tegra: Add PCIe Gen2 link speed support

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Tegra124, Tegra132, Tegra210 and Tegra186 support Gen2 link speed. After
PCIe link is up in Gen1, set target link speed as Gen2 and retrain link.
Link switches to Gen2 speed if Gen2 capable end point is connected,
otherwise the link stays in Gen1.

Per PCIe 4.0r0.9 sec 7.6.3.7 implementation note, driver needs to wait for
PCIe LTSSM to come back from recovery before retraining the link.

Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Thierry Reding <treding@nvidia.com>

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Manikanta Maddireddy 2019-06-18 23:31:45 +05:30 • committed by Lorenzo Pieralisi

parent d1f9113faf

commit 538123a29a

1 changed files with 64 additions and 0 deletions

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drivers/pci/controller/pci-tegra.c

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