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PCI: tegra: Set target speed as Gen1 before starting LTSSM

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PCIe link up fails with few legacy endpoints if root port advertises both
Gen-1 and Gen-2 speeds in Tegra. This is because link number negotiation
fails if both Gen1 & Gen2 are advertised. Tegra doesn't retry link up by
advertising only Gen1. Hence, the strategy followed here is to initially
advertise only Gen-1 and after link is up, retrain link to Gen-2 speed.

Tegra doesn't support HW autonomous speed change. Link comes up in Gen1
even if Gen2 is advertised, so there is no downside of this change.

This behavior is observed with following two PCIe devices on Tegra:

- Fusion HDTV 5 Express card
- IOGear SIL - PCIE - SATA card

Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Manikanta Maddireddy 2019-06-18 23:31:55 +05:30 committed by Lorenzo Pieralisi
parent 9f570b6c24
commit c23ae2aec5
1 changed files with 11 additions and 0 deletions
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11
drivers/pci/controller/pci-tegra.c
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@ -676,6 +676,17 @@ static void tegra_pcie_apply_sw_fixup(struct tegra_pcie_port *port)
value |= soc->update_fc_threshold;
writel(value, port->base + RP_VEND_XP);
}
/*
* PCIe link doesn't come up with few legacy PCIe endpoints if
* root port advertises both Gen-1 and Gen-2 speeds in Tegra.
* Hence, the strategy followed here is to initially advertise
* only Gen-1 and after link is up, retrain link to Gen-2 speed
*/
value = readl(port->base + RP_LINK_CONTROL_STATUS_2);
value &= ~PCI_EXP_LNKSTA_CLS;
value |= PCI_EXP_LNKSTA_CLS_2_5GB;
writel(value, port->base + RP_LINK_CONTROL_STATUS_2);
}
static void tegra_pcie_port_enable(struct tegra_pcie_port *port)