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-rw-r--r--drivers/pci/pci.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 709e44e7578b..588886371df1 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2289,7 +2289,7 @@ void pci_config_pm_runtime_put(struct pci_dev *pdev)
* @bridge: Bridge to check
*
* This function checks if it is possible to move the bridge to D3.
- * Currently we only allow D3 for recent enough PCIe ports.
+ * Currently we only allow D3 for recent enough PCIe ports and Thunderbolt.
*/
bool pci_bridge_d3_possible(struct pci_dev *bridge)
{
@@ -2304,18 +2304,27 @@ bool pci_bridge_d3_possible(struct pci_dev *bridge)
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
+ * 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)
+ if (bridge->is_hotplug_bridge && !pciehp_is_native(bridge))
return false;
if (pci_bridge_d3_force)
return true;
+ /* Even the oldest 2010 Thunderbolt controller supports D3. */
+ if (bridge->is_thunderbolt)
+ return true;
+
+ /*
+ * Hotplug ports handled natively by the OS were not validated
+ * by vendors for runtime D3 at least until 2018 because there
+ * was no OS support.
+ */
+ if (bridge->is_hotplug_bridge)
+ return false;
+
/*
* It should be safe to put PCIe ports from 2015 or newer
* to D3.