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 the next patch fixing suspend/resume on i915.
Suggested by Rafael.
Cc: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: linux-pci@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
[ After discussing with Jani, I'm going to apply this and the next patch
for now to the intel-gfx specific CI branch to unblock our testing. ]
drivers/pci/pci.c | 3 ++-
include/linux/pci.h | 7 +++++++
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 7904d02..020f02d 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2141,7 +2141,8 @@ 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->needs_resume)
return false;
/*
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 5948cfd..2f012f8 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -316,6 +316,9 @@ struct pci_dev {
unsigned int hotplug_user_indicators:1; /* SlotCtl indicators
controlled exclusively by
user sysfs */
+ unsigned int needs_resume:1; /* Resume before calling the driver's
+ system suspend hooks, disabling the
+ direct_complete optimization. */
unsigned int d3_delay; /* D3->D0 transition time in ms */
unsigned int d3cold_delay; /* D3cold->D0 transition time in ms */
@@ -1110,6 +1113,10 @@ bool pci_check_pme_status(struct pci_dev *dev);
void pci_pme_wakeup_bus(struct pci_bus *bus);
void pci_d3cold_enable(struct pci_dev *dev);
void pci_d3cold_disable(struct pci_dev *dev);
+static inline void pci_resume_before_suspend(struct pci_dev *dev, bool enable)
+{
+ dev->needs_resume = enable;
+}
static inline int pci_enable_wake(struct pci_dev *dev, pci_power_t state,
bool enable)
--
2.5.0
