diff options
Diffstat (limited to 'drivers/pci/host/pcie-designware.c')
| -rw-r--r-- | drivers/pci/host/pcie-designware.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c index f85f10d22049..e4fb44295d61 100644 --- a/drivers/pci/host/pcie-designware.c +++ b/drivers/pci/host/pcie-designware.c @@ -22,6 +22,7 @@ #include <linux/pci_regs.h> #include <linux/platform_device.h> #include <linux/types.h> +#include <linux/delay.h> #include "pcie-designware.h" @@ -380,6 +381,24 @@ static struct msi_controller dw_pcie_msi_chip = { .teardown_irq = dw_msi_teardown_irq, }; +int dw_pcie_wait_for_link(struct pcie_port *pp) +{ + int retries; + + /* check if the link is up or not */ + for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) { + if (dw_pcie_link_up(pp)) { + dev_info(pp->dev, "link up\n"); + return 0; + } + usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX); + } + + dev_err(pp->dev, "phy link never came up\n"); + + return -ETIMEDOUT; +} + int dw_pcie_link_up(struct pcie_port *pp) { if (pp->ops->link_up) |