Mika Westerberg 006d44e49a PCI: Add runtime PM support for PCIe ports ... Add back runtime PM support for PCIe ports that was removed by fe9a743a26 ("PCI/PM: Drop unused runtime PM support code for PCIe ports"). We cannot enable it automatically for all ports since there have been problems previously [1]. In summary suspended PCIe ports were not able to deal with ACPI-based hotplug reliably. One reason why this might happen is the fact that when a PCIe port is powered down, config space access to the devices behind the port is not possible. If the BIOS hotplug SMI handler assumes the port is always in D0 it will not be able to find the hotplugged devices. To be on the safe side only enable runtime PM if the port does not claim to support hotplug. For PCIe ports not using hotplug, we enable and allow runtime PM automatically. Since 'bridge_d3' can be changed any time we check this in driver ->runtime_idle() and ->runtime_suspend() and only allow runtime suspend if the flag is still set. Use autosuspend with default of 100ms idle time to prevent the port from repeatedly suspending and resuming on continuous configuration space access of devices behind the port. The actual power transition to D3 and back is handled in the PCI core. Idea to automatically unblock (allow) runtime PM for PCIe ports came from Dave Airlie. [1] https://bugzilla.kernel.org/show_bug.cgi?id=53811 This includes a fix for lockdep issue reported by Valdis Kletnieks. Tested-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		2016-06-13 14:58:53 -05:00
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aer	PCI changes for the v4.6 merge window:	2016-03-16 14:45:55 -07:00
aspm.c	PCI/ASPM: Make sysfs link_state_store() consistent with link_state_show()	2015-12-03 10:42:59 -06:00
Kconfig	PCI: Add Downstream Port Containment driver	2016-05-03 10:39:24 -05:00
Makefile	PCI: Add Downstream Port Containment driver	2016-05-03 10:39:24 -05:00
pcie-dpc.c	PCI: Add Downstream Port Containment driver	2016-05-03 10:39:24 -05:00
pme.c	PCI/PME: Restructure pcie_pme_suspend() to prevent compiler warning	2016-02-05 16:28:03 -06:00
portdrv_acpi.c	Merge branches 'pci/dpc', 'pci/resource' and 'pci/thunderbolt' into next	2016-05-03 11:49:21 -05:00
portdrv_bus.c	PCI: Fix whitespace, capitalization, and spelling errors	2013-11-14 11:28:18 -07:00
portdrv_core.c	PCI: Add runtime PM support for PCIe ports	2016-06-13 14:58:53 -05:00
portdrv_pci.c	PCI: Add runtime PM support for PCIe ports	2016-06-13 14:58:53 -05:00
portdrv.h	Merge branches 'pci/dpc', 'pci/resource' and 'pci/thunderbolt' into next	2016-05-03 11:49:21 -05:00