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[5/5] PCI: Whitelist native hotplug ports for runtime PM

Message ID f8ddb6ebb9a5d78b5cbbadc12a25b359052c7d03.1493631639.git.lukas@wunner.de
State Superseded
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Lukas Wunner May 1, 2017, 12:06 p.m. UTC 
Previously we blacklisted PCIe hotplug ports for runtime PM because:

(a) Ports handled by the firmware must not be transitioned to D3hot by
    OSPM behind the firmware's back:
    https://bugzilla.kernel.org/show_bug.cgi?id=53811

(b) For ports handled natively by OSPM we lacked proper runtime PM
    support in the pciehp driver.

We've just rectified the latter, so stop blacklisting those.

Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Erik Veijola <erik.veijola@linux.intel.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Krishna Dhulipala <krishnad@fb.com>
Cc: Wei Zhang <wzhang@fb.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
---
 drivers/pci/pci.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
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Patch

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index b01bd5bba8e6..7567e575d536 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2244,13 +2244,10 @@  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)