--- atl1cold/atl1c_main.c	2010-08-04 16:21:59.863328895 +0800
+++ atl1cnew/atl1c_main.c	2010-08-16 11:06:42.217285358 +0800
@@ -20,6 +20,7 @@
  */
 
 #include "atl1c.h"
+#include <linux/pm_runtime.h>
 
 #define ATL1C_DRV_VERSION "1.0.0.2-NAPI"
 char atl1c_driver_name[] = "atl1c";
@@ -66,6 +67,8 @@
 static void atl1c_setup_mac_ctrl(struct atl1c_adapter *adapter);
 static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter, u8 que,
 		   int *work_done, int work_to_do);
+static int atl1c_runtime_suspend(struct device *device);
+static int atl1c_runtime_resume(struct device *device);
 
 static const u16 atl1c_pay_load_size[] = {
 	128, 256, 512, 1024, 2048, 4096,
@@ -98,6 +101,9 @@
 static const u32 atl1c_default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
 	NETIF_MSG_LINK | NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP;
 
+/*a variable indicates current H/W power state*/
+static u16 atl1c_d3  = 1;
+
 /*
  * atl1c_init_pcie - init PCIE module
  */
@@ -240,8 +246,13 @@
 			atl1c_set_aspm(hw, false);
 		}
 		netif_carrier_off(netdev);
+
+		pm_runtime_put_noidle(&pdev->dev);
+		pm_schedule_suspend(&pdev->dev,0);
 	} else {
 		/* Link Up */
+		pm_request_resume(&pdev->dev);
+
 		hw->hibernate = false;
 		spin_lock_irqsave(&adapter->mdio_lock, flags);
 		err = atl1c_get_speed_and_duplex(hw, &speed, &duplex);
@@ -1576,6 +1587,21 @@
 }
 
 /*
+ * checkPoweState - If current power state is D3hot, resume it to D0 
+ * @pdev: pointer to a pci network interface device structure
+ */
+static inline int checkPowerState(struct pci_dev * pdev)
+{
+	if (unlikely(atl1c_d3)) {
+		pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, 0);
+		pdev->dev.power.runtime_status = 0;
+		atl1c_d3 = 0;
+		return 1;
+	}
+	return 0;
+}
+
+/*
  * atl1c_intr - Interrupt Handler
  * @irq: interrupt number
  * @data: pointer to a network interface device structure
@@ -1592,6 +1618,8 @@
 	u32 status;
 	u32 reg_data;
 
+	checkPowerState(pdev);
+
 	do {
 		AT_READ_REG(hw, REG_ISR, &reg_data);
 		status = reg_data & hw->intr_mask;
@@ -2703,6 +2731,12 @@
 	if (netif_msg_probe(adapter))
 		dev_info(&pdev->dev, "version %s\n", ATL1C_DRV_VERSION);
 	cards_found++;
+
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	
+	pm_runtime_idle(&pdev->dev);
+
 	return 0;
 
 err_reset:
@@ -2832,6 +2866,57 @@
 	.resume = atl1c_io_resume,
 };
 
+/* Adding runtime power management support*/
+#ifdef CONFIG_PM
+
+//callback function definition
+static int atl1c_runtime_suspend(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+
+	pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, 3);
+	atl1c_d3 = 1;
+	dev_err(&pdev->dev, "[debug] runtime_suspend\n");
+
+	return 0; 
+}
+
+static int atl1c_runtime_resume(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+
+	pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, 0);
+	atl1c_d3 = 0;
+	dev_err(&pdev->dev, "[debug] runtime_resume\n");
+
+	return 0; 
+}
+
+static int atl1c_runtime_idle(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct atl1c_adapter *adapter = netdev_priv(dev);	
+
+	atl1c_check_link_status(adapter);
+
+	return 0; 
+}
+
+static const struct dev_pm_ops atl1c_pm_ops = {
+	.runtime_suspend = atl1c_runtime_suspend,
+	.runtime_resume = atl1c_runtime_resume,
+	.runtime_idle = atl1c_runtime_idle,
+};
+
+#define ATL1C_PM_OPS (&atl1c_pm_ops)
+
+#else /* !CONFIG_PM */
+
+#define ATL1C_PM_OPS	NULL
+
+#endif /* !CONFIG_PM */
+
 static struct pci_driver atl1c_driver = {
 	.name     = atl1c_driver_name,
 	.id_table = atl1c_pci_tbl,
@@ -2841,7 +2926,8 @@
 	.suspend  = atl1c_suspend,
 	.resume   = atl1c_resume,
 	.shutdown = atl1c_shutdown,
-	.err_handler = &atl1c_err_handler
+	.err_handler = &atl1c_err_handler,
+	.driver.pm = ATL1C_PM_OPS,
 };
 
 /*