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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-10-14 13:25:00 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-10-15 23:51:36 +0200
commit45144d42f299455911cc29366656c7324a3a7c97 (patch)
tree99cf03c9cbad13888b27ae619cb1a460259053a4 /drivers/pci/pci.c
parent4f5cafb5cb8471e54afdc9054d973535614f7675 (diff)
PCI: PM: Fix pci_power_up()
There is an arbitrary difference between the system resume and runtime resume code paths for PCI devices regarding the delay to apply when switching the devices from D3cold to D0. Namely, pci_restore_standard_config() used in the runtime resume code path calls pci_set_power_state() which in turn invokes __pci_start_power_transition() to power up the device through the platform firmware and that function applies the transition delay (as per PCI Express Base Specification Revision 2.0, Section 6.6.1). However, pci_pm_default_resume_early() used in the system resume code path calls pci_power_up() which doesn't apply the delay at all and that causes issues to occur during resume from suspend-to-idle on some systems where the delay is required. Since there is no reason for that difference to exist, modify pci_power_up() to follow pci_set_power_state() more closely and invoke __pci_start_power_transition() from there to call the platform firmware to power up the device (in case that's necessary). Fixes: db288c9c5f9d ("PCI / PM: restore the original behavior of pci_set_power_state()") Reported-by: Daniel Drake <drake@endlessm.com> Tested-by: Daniel Drake <drake@endlessm.com> Link: https://lore.kernel.org/linux-pm/CAD8Lp44TYxrMgPLkHCqF9hv6smEurMXvmmvmtyFhZ6Q4SE+dig@mail.gmail.com/T/#m21be74af263c6a34f36e0fc5c77c5449d9406925 Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Cc: 3.10+ <stable@vger.kernel.org> # 3.10+
Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c24
1 files changed, 11 insertions, 13 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e7982af9a5d8..a97e2571a527 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -959,19 +959,6 @@ void pci_refresh_power_state(struct pci_dev *dev)
}
/**
- * pci_power_up - Put the given device into D0 forcibly
- * @dev: PCI device to power up
- */
-void pci_power_up(struct pci_dev *dev)
-{
- if (platform_pci_power_manageable(dev))
- platform_pci_set_power_state(dev, PCI_D0);
-
- pci_raw_set_power_state(dev, PCI_D0);
- pci_update_current_state(dev, PCI_D0);
-}
-
-/**
* pci_platform_power_transition - Use platform to change device power state
* @dev: PCI device to handle.
* @state: State to put the device into.
@@ -1154,6 +1141,17 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
EXPORT_SYMBOL(pci_set_power_state);
/**
+ * pci_power_up - Put the given device into D0 forcibly
+ * @dev: PCI device to power up
+ */
+void pci_power_up(struct pci_dev *dev)
+{
+ __pci_start_power_transition(dev, PCI_D0);
+ pci_raw_set_power_state(dev, PCI_D0);
+ pci_update_current_state(dev, PCI_D0);
+}
+
+/**
* pci_choose_state - Choose the power state of a PCI device
* @dev: PCI device to be suspended
* @state: target sleep state for the whole system. This is the value