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authorLey Foon Tan <lftan@altera.com>2016-06-21 16:53:12 +0800
committerBjorn Helgaas <bhelgaas@google.com>2016-07-22 15:58:02 -0500
commitc622032ebc538cb3869c312ae3ad235a99da84b6 (patch)
tree183273b78f61a74c3ca54be92a0fff176cb2dbcc /drivers/pci
parentf8be11ae3d2c9a1338da37ff91ff4c65922d21be (diff)
downloadlinux-c622032ebc538cb3869c312ae3ad235a99da84b6.tar.bz2
PCI: altera: Check link status before retrain link
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>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/host/pcie-altera.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c
index a1e782263dec..b61025ee07de 100644
--- a/drivers/pci/host/pcie-altera.c
+++ b/drivers/pci/host/pcie-altera.c
@@ -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