linux-kernel - [PATCH 4/4] PCI/PM: Enable D3cold support for system suspend

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Date:	Tue, 29 Jan 2013 12:34:18 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-acpi@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Huang Ying <ying.huang@...el.com>
Subject: [PATCH 4/4] PCI/PM: Enable D3cold support for system suspend

Device may need to be put in D3cold on some platforms, especially
because we treat ACPI_STATE_D3 as ACPI_STATE_D3_COLD now.

Signed-off-by: Huang Ying <ying.huang@...el.com>
---
 drivers/pci/pci-driver.c |    5 +++++
 drivers/pci/pci.c        |    4 ----
 2 files changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -579,6 +579,7 @@ static bool pci_has_legacy_pm_support(st
 static int pci_pm_prepare(struct device *dev)
 {
 	struct device_driver *drv = dev->driver;
+	struct pci_dev *pci_dev = to_pci_dev(dev);
 	int error = 0;
 
 	/*
@@ -592,6 +593,10 @@ static int pci_pm_prepare(struct device
 	 */
 	pm_runtime_resume(dev);
 
+	if (!pci_dev->d3cold_allowed)
+		pci_dev->no_d3cold = true;
+	else
+		pci_dev->no_d3cold = false;
 	if (drv && drv->pm && drv->pm->prepare)
 		error = drv->pm->prepare(dev);
 
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1798,10 +1798,6 @@ int pci_prepare_to_sleep(struct pci_dev
 	if (target_state == PCI_POWER_ERROR)
 		return -EIO;
 
-	/* D3cold during system suspend/hibernate is not supported */
-	if (target_state > PCI_D3hot)
-		target_state = PCI_D3hot;
-
 	pci_enable_wake(dev, target_state, device_may_wakeup(&dev->dev));
 
 	error = pci_set_power_state(dev, target_state);
--
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