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PCI/PM: Add needs_resume flag to avoid suspend complete optimization 

Some drivers - like i915 - may not support the system suspend direct
complete optimization due to differences in their runtime and system
suspend sequence.  Add a flag that when set resumes the device before
calling the driver's system suspend handlers which effectively disables
the optimization.

Needed by a future patch fixing suspend/resume on i915.

Suggested by Rafael.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Imre Deak 2017-05-23 14:18:17 -05:00 committed by Bjorn Helgaas
parent 415b6185c5
commit 4d071c3238
2 changed files with 7 additions and 1 deletions
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3
drivers/pci/pci.c
View File

@ -2144,7 +2144,8 @@ bool pci_dev_keep_suspended(struct pci_dev *pci_dev)
if (!pm_runtime_suspended(dev)
|| pci_target_state(pci_dev) != pci_dev->current_state
|| platform_pci_need_resume(pci_dev))
|| platform_pci_need_resume(pci_dev)
|| (pci_dev->dev_flags & PCI_DEV_FLAGS_NEEDS_RESUME))
return false;
/*

5
include/linux/pci.h
View File

@ -183,6 +183,11 @@ enum pci_dev_flags {
PCI_DEV_FLAGS_BRIDGE_XLATE_ROOT = (__force pci_dev_flags_t) (1 << 9),
/* Do not use FLR even if device advertises PCI_AF_CAP */
PCI_DEV_FLAGS_NO_FLR_RESET = (__force pci_dev_flags_t) (1 << 10),
/*
* Resume before calling the driver's system suspend hooks, disabling
* the direct_complete optimization.
*/
PCI_DEV_FLAGS_NEEDS_RESUME = (__force pci_dev_flags_t) (1 << 11),
};
enum pci_irq_reroute_variant {