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PCI: altera: Check link status before retrain link

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commit c622032ebc upstream.

Check the link status before retraining.  If the link is not up, don't
bother trying to retrain it.

[bhelgaas: split code move to separate patch, changelog]
Signed-off-by: Ley Foon Tan <lftan@altera.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Claudius Heine <claudius.heine.ext@siemens.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ley Foon Tan
2016-06-21 16:53:12 +08:00
committed by Greg Kroah-Hartman
parent 9efffbc819
commit cb3ff0382e
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/host/pcie-altera.c
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@@ -100,6 +100,10 @@ static bool altera_pcie_link_is_up(struct altera_pcie *pcie)
static void altera_pcie_retrain(struct pci_dev *dev)
{
u16 linkcap, linkstat;
struct altera_pcie *pcie = dev->bus->sysdata;
if (!altera_pcie_link_is_up(pcie))
return;
/*
* Set the retrain bit if the PCIe rootport support > 2.5GB/s, but