diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 954717d7033f..3aa73ecdf86f 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -213,8 +213,19 @@ static int pcie_wait_for_retrain(struct pci_dev *pdev) static int pcie_retrain_link(struct pcie_link_state *link) { struct pci_dev *parent = link->pdev; + int rc; u16 reg16; + /* + * Ensure the updated LNKCTL parameters are used during link + * training by checking that there is no ongoing link training to + * avoid LTSSM race as recommended in Implementation Note at the + * end of PCIe r6.0.1 sec 7.5.3.7. + */ + rc = pcie_wait_for_retrain(parent); + if (rc) + return rc; + pcie_capability_read_word(parent, PCI_EXP_LNKCTL, ®16); reg16 |= PCI_EXP_LNKCTL_RL; pcie_capability_write_word(parent, PCI_EXP_LNKCTL, reg16); |