diff options
| author | Gabriele Paoloni <gabriele.paoloni@huawei.com> | 2015-09-28 18:03:10 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2015-11-02 21:48:45 +0100 |
| commit | 907fce0902539ecde609e485eb2ecd7119a7a623 (patch) | |
| tree | 158e8616fa813e0d0e2aa9a285f9de0f22317143 /drivers/pci/host/pcie-designware.c | |
| parent | PCI: designware: Require config accesses to be naturally aligned (diff) | |
| download | linux-907fce0902539ecde609e485eb2ecd7119a7a623.tar.xz linux-907fce0902539ecde609e485eb2ecd7119a7a623.zip | |
PCI: designware: Make "num-lanes" an optional DT property
Currently "num-lanes" is read in dw_pcie_host_init(), but it is only used
if we call dw_pcie_setup_rc() while bringing up the link. If the link has
already been brought up by firmware, we need not call dw_pcie_setup_rc(),
and "num-lanes" is unnecessary.
Only complain about "num-lanes" if we actually need it and we didn't find a
valid value.
[bhelgaas: changelog]
Signed-off-by: Gabriele Paoloni <gabriele.paoloni@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/host/pcie-designware.c')
| -rw-r--r-- | drivers/pci/host/pcie-designware.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c index b77535f3967b..fb89ca23d9a8 100644 --- a/drivers/pci/host/pcie-designware.c +++ b/drivers/pci/host/pcie-designware.c @@ -534,10 +534,9 @@ int dw_pcie_host_init(struct pcie_port *pp) } } - if (of_property_read_u32(np, "num-lanes", &pp->lanes)) { - dev_err(pp->dev, "Failed to parse the number of lanes\n"); - return -EINVAL; - } + ret = of_property_read_u32(np, "num-lanes", &pp->lanes); + if (ret) + pp->lanes = 0; if (IS_ENABLED(CONFIG_PCI_MSI)) { if (!pp->ops->msi_host_init) { @@ -814,6 +813,9 @@ void dw_pcie_setup_rc(struct pcie_port *pp) case 8: val |= PORT_LINK_MODE_8_LANES; break; + default: + dev_err(pp->dev, "num-lanes %u: invalid value\n", pp->lanes); + return; } dw_pcie_writel_rc(pp, val, PCIE_PORT_LINK_CONTROL); |