diff options
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index ee6323ded1c8..954717d7033f 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -193,10 +193,26 @@ static void pcie_clkpm_cap_init(struct pcie_link_state *link, int blacklist) link->clkpm_disable = blacklist ? 1 : 0; } +static int pcie_wait_for_retrain(struct pci_dev *pdev) +{ + unsigned long end_jiffies; + u16 reg16; + + /* Wait for Link Training to be cleared by hardware */ + end_jiffies = jiffies + LINK_RETRAIN_TIMEOUT; + do { + pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, ®16); + if (!(reg16 & PCI_EXP_LNKSTA_LT)) + return 0; + msleep(1); + } while (time_before(jiffies, end_jiffies)); + + return -ETIMEDOUT; +} + static int pcie_retrain_link(struct pcie_link_state *link) { struct pci_dev *parent = link->pdev; - unsigned long end_jiffies; u16 reg16; pcie_capability_read_word(parent, PCI_EXP_LNKCTL, ®16); @@ -212,17 +228,7 @@ static int pcie_retrain_link(struct pcie_link_state *link) pcie_capability_write_word(parent, PCI_EXP_LNKCTL, reg16); } - /* Wait for link training end. Break out after waiting for timeout */ - end_jiffies = jiffies + LINK_RETRAIN_TIMEOUT; - do { - pcie_capability_read_word(parent, PCI_EXP_LNKSTA, ®16); - if (!(reg16 & PCI_EXP_LNKSTA_LT)) - break; - msleep(1); - } while (time_before(jiffies, end_jiffies)); - if (reg16 & PCI_EXP_LNKSTA_LT) - return -ETIMEDOUT; - return 0; + return pcie_wait_for_retrain(parent); } /* |