linux-kernel - [Update][PATCH] PCI / PM: Allow PCI devices to be put into D3cold during system suspend

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Date:	Mon, 21 Jul 2014 03:18:24 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Linux PCI <linux-pci@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Huang Ying <huang.ying.caritas@...il.com>
Subject: [Update][PATCH] PCI / PM: Allow PCI devices to be put into D3cold during system suspend

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Commit 448bd857d48e (PCI/PM: add PCIe runtime D3cold support) added
a check to prevent PCI devices from being put into D3cold during
system suspend without giving any particular reason.

Also the check isn't really necessary, because acpi_pci_set_power_state()
maps PCI_D3hot to ACPI_STATE_D3_COLD anyway.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

Ying notices that acpi_pci_set_power_state() maps PCI D3hot to ACPI
D3cold, so the check actually isn't effective even, but that means
that the second part of my original changelog was in fact incorrect.

---
 drivers/pci/pci.c |    4 ----
 1 file changed, 4 deletions(-)

Index: linux-pm/drivers/pci/pci.c
===================================================================
--- linux-pm.orig/drivers/pci/pci.c
+++ linux-pm/drivers/pci/pci.c
@@ -1907,10 +1907,6 @@ 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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