diff options
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 720f7e27c3a8..a40ba0225265 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2243,6 +2243,17 @@ bool pci_bridge_d3_possible(struct pci_dev *bridge) case PCI_EXP_TYPE_DOWNSTREAM: if (pci_bridge_d3_disable) return false; + + /* + * Hotplug interrupts cannot be delivered if the link is down, + * so parents of a hotplug port must stay awake. In addition, + * hotplug ports handled by firmware in System Management Mode + * may not be put into D3 by the OS (Thunderbolt on non-Macs). + * For simplicity, disallow in general for now. + */ + if (bridge->is_hotplug_bridge) + return false; + if (pci_bridge_d3_force) return true; |