From eb9c39d031bbcfd4005bd7e0337c3fd3909c1bf7 Mon Sep 17 00:00:00 2001
From: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Wed, 17 Dec 2008 12:10:05 -0800
Subject: [PATCH] PCI: set device wakeup capable flag if platform support is
present
When PCI devices are initialized, we check whether they support PCI PM
caps and set the device can_wakeup flag if so. However, some devices
may have platform provided wakeup events rather than PCI PME signals, so
we need to set can_wakeup in that case too. Doing so should allow
wakeups from many more devices, especially on cost constrained systems.
Reported-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Joseph Chan <JosephChan@via.com.tw>
Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
drivers/pci/pci.c | 20 ++++++++++++++++++++
drivers/pci/pci.h | 1 +
drivers/pci/probe.c | 1 +
3 files changed, 22 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 7e9c0f3936dd..1b807330e500 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1285,6 +1285,26 @@ void pci_pm_init(struct pci_dev *dev)
}
}
+/**
+ * platform_pci_wakeup_init - init platform wakeup if present
+ * @dev: PCI device
+ *
+ * Some devices don't have PCI PM caps but can still generate wakeup
+ * events through platform methods (like ACPI events). If @dev supports
+ * platform wakeup events, set the device flag to indicate as much. This
+ * may be redundant if the device also supports PCI PM caps, but double
+ * initialization should be safe in that case.
+ */
+void platform_pci_wakeup_init(struct pci_dev *dev)
+{
+ if (!platform_pci_can_wakeup(dev))
+ return;
+
+ device_set_wakeup_capable(&dev->dev, true);
+ device_set_wakeup_enable(&dev->dev, false);
+ platform_pci_sleep_wake(dev, false);
+}
+
/**
* pci_add_save_buffer - allocate buffer for saving given capability registers
* @dev: the PCI device
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index d1e92d83aa06..65deed8bfc06 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -45,6 +45,7 @@ struct pci_platform_pm_ops {
extern int pci_set_platform_pm(struct pci_platform_pm_ops *ops);
extern void pci_pm_init(struct pci_dev *dev);
+extern void platform_pci_wakeup_init(struct pci_dev *dev);
extern void pci_allocate_cap_save_buffers(struct pci_dev *dev);
extern int pci_user_read_config_byte(struct pci_dev *dev, int where, u8 *val);
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 2ee00962734b..303644614eea 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -965,6 +965,7 @@ static void pci_init_capabilities(struct pci_dev *dev)
/* Power Management */
pci_pm_init(dev);
+ platform_pci_wakeup_init(dev);
/* Vital Product Data */
pci_vpd_pci22_init(dev);
--
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