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-rw-r--r--src/soc/intel/baytrail/pcie.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/src/soc/intel/baytrail/pcie.c b/src/soc/intel/baytrail/pcie.c
index ff4891350e..187015801d 100644
--- a/src/soc/intel/baytrail/pcie.c
+++ b/src/soc/intel/baytrail/pcie.c
@@ -230,6 +230,19 @@ static void byt_pcie_enable(device_t dev)
southcluster_enable_dev(dev);
}
+static unsigned int byt_pciexp_scan_bridge(device_t dev, unsigned int max)
+{
+ static const struct reg_script wait_for_link_active[] = {
+ REG_PCI_POLL32(LCTL, (1 << 29) , (1 << 29), 50000),
+ REG_SCRIPT_END,
+ };
+
+ /* wait for Link Active with 50ms timeout */
+ reg_script_run_on_dev(dev, wait_for_link_active);
+
+ return do_pci_scan_bridge(dev, max, pciexp_scan_bus);
+}
+
static void pcie_root_set_subsystem(device_t dev, unsigned vid, unsigned did)
{
uint32_t didvid = ((did & 0xffff) << 16) | (vid & 0xffff);
@@ -248,7 +261,7 @@ static struct device_operations device_ops = {
.set_resources = pci_dev_set_resources,
.enable_resources = pci_bus_enable_resources,
.init = byt_pcie_init,
- .scan_bus = pciexp_scan_bridge,
+ .scan_bus = byt_pciexp_scan_bridge,
.enable = byt_pcie_enable,
.ops_pci = &pcie_root_ops,
};