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PCI: mvebu: Dynamically detect if the PEX link is up to enable hot plug

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Otherwise hotplugging the PEX doesn't work at all since the driver
detects the link state at probe time. Simply replacing the two tests
of haslink with a register read is enough to fix it.

Tested on kirkwood with repeated plug/unplug of the link partner.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Jason Gunthorpe 2013-10-01 11:58:00 -06:00 committed by Jason Cooper
parent 96ae0b5486
commit 9f352f0e6c
1 changed files with 8 additions and 11 deletions
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19
drivers/pci/host/pci-mvebu.c
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@ -120,7 +120,6 @@ struct mvebu_pcie_port {
char *name;
void __iomem *base;
spinlock_t conf_lock;
int haslink;
u32 port;
u32 lane;
int devfn;
@ -560,7 +559,7 @@ static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
if (bus->number == 0)
return mvebu_sw_pci_bridge_write(port, where, size, val);
if (!port->haslink)
if (!mvebu_pcie_link_up(port))
return PCIBIOS_DEVICE_NOT_FOUND;
/*
@ -602,7 +601,7 @@ static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
if (bus->number == 0)
return mvebu_sw_pci_bridge_read(port, where, size, val);
if (!port->haslink) {
if (!mvebu_pcie_link_up(port)) {
*val = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
@ -950,14 +949,12 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
mvebu_pcie_set_local_dev_nr(port, 1);
if (mvebu_pcie_link_up(port)) {
port->haslink = 1;
dev_info(&pdev->dev, "PCIe%d.%d: link up\n",
port->port, port->lane);
} else {
port->haslink = 0;
dev_info(&pdev->dev, "PCIe%d.%d: link down\n",
port->port, port->lane);
port->clk = of_clk_get_by_name(child, NULL);
if (IS_ERR(port->clk)) {
dev_err(&pdev->dev, "PCIe%d.%d: cannot get clock\n",
port->port, port->lane);
iounmap(port->base);
continue;
}
port->dn = child;