diff options
Diffstat (limited to 'src/soc/intel/baytrail/pcie.c')
| -rw-r--r-- | src/soc/intel/baytrail/pcie.c | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/src/soc/intel/baytrail/pcie.c b/src/soc/intel/baytrail/pcie.c index 71b90ded47..f80a494a0b 100644 --- a/src/soc/intel/baytrail/pcie.c +++ b/src/soc/intel/baytrail/pcie.c @@ -155,6 +155,35 @@ static void check_port_enabled(device_t dev) } } +static u8 all_ports_no_dev_present(device_t dev) +{ + u8 func; + u8 temp = dev->path.pci.devfn; + u8 device_not_present = 1; + u8 data; + + for (func = 1; func < PCIE_ROOT_PORT_COUNT; func++) { + dev->path.pci.devfn &= ~0x7; + dev->path.pci.devfn |= func; + + /* is pcie device there */ + if (pci_read_config32(dev, 0) == 0xFFFFFFFF) + continue; + + data = pci_read_config8(dev, XCAP + 3) | (SI >> 24); + pci_write_config8(dev, XCAP + 3, data); + + /* is any device present */ + if ((pci_read_config32(dev, SLCTL_SLSTS) & PDS)) { + device_not_present = 0; + break; + } + } + + dev->path.pci.devfn = temp; + return device_not_present; +} + static void check_device_present(device_t dev) { /* Set slot implemented. */ @@ -163,8 +192,14 @@ static void check_device_present(device_t dev) /* No device present. */ if (!(pci_read_config32(dev, SLCTL_SLSTS) & PDS)) { printk(BIOS_DEBUG, "No PCIe device present.\n"); - reg_script_run_on_dev(dev, no_dev_behind_port); - dev->enabled = 0; + if (is_first_port(dev)) { + if (all_ports_no_dev_present(dev)) { + reg_script_run_on_dev(dev, no_dev_behind_port); + dev->enabled = 0; + } + } else { + dev->enabled = 0; + } } else if(!dev->enabled) { /* Port is disabled, but device present. Disable link. */ pci_write_config32(dev, LCTL, |