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pci-tegra.c force alive pcie port #827

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pci-tegra.c force alive pcie port #827

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25 changes: 18 additions & 7 deletions drivers/pci/controller/pci-tegra.c
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Original file line number Diff line number Diff line change
Expand Up @@ -351,6 +351,8 @@ struct tegra_pcie {

const struct tegra_pcie_soc *soc;
struct dentry *debugfs;

bool force_alive;
};

static inline struct tegra_pcie *msi_to_pcie(struct tegra_msi *msi)
Expand Down Expand Up @@ -2361,15 +2363,24 @@ static void tegra_pcie_enable_ports(struct tegra_pcie *pcie)
/* Start LTSSM from Tegra side */
reset_control_deassert(pcie->pcie_xrst);

list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
if (tegra_pcie_port_check_link(port))
continue;
list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
if (tegra_pcie_port_check_link(port))
continue;

dev_info(dev, "link %u down, ignoring\n", port->index);
dev_info(dev, "trying link %u down \n", port->index);

if (pcie->force_alive)
{
dev_info(dev, "link %u forced to alive \n", port->index);
} else
{
tegra_pcie_port_disable(port);
tegra_pcie_port_free(port);
dev_info(dev, "link %u down \n", port->index);
}

}

tegra_pcie_port_disable(port);
tegra_pcie_port_free(port);
}

if (pcie->soc->has_gen2)
tegra_pcie_change_link_speed(pcie);
Expand Down