diff --git a/drivers/dahdi/dahdi-base.c b/drivers/dahdi/dahdi-base.c
index 88e44be..6cb5ec8 100644
--- a/drivers/dahdi/dahdi-base.c
+++ b/drivers/dahdi/dahdi-base.c
@@ -10041,6 +10041,24 @@ failed_driver_init:
 	return res;
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)
+#ifdef CONFIG_PCI
+void dahdi_pci_disable_link_state(struct pci_dev *pdev, int state)
+{
+	u16 reg16;
+	int pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
+	state &= (PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1 |
+		  PCIE_LINK_STATE_CLKPM);
+	if (!pos)
+		return;
+	pci_read_config_word(pdev, pos + PCI_EXP_LNKCTL, &reg16);
+	reg16 &= ~(state);
+	pci_write_config_word(pdev, pos + PCI_EXP_LNKCTL, reg16);
+}
+EXPORT_SYMBOL(dahdi_pci_disable_link_state);
+#endif /* CONFIG_PCI */
+#endif /* 2.6.25 */
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22)
 static inline void flush_find_master_work(void)
 {
diff --git a/include/dahdi/kernel.h b/include/dahdi/kernel.h
index ec7f90b..93d0046 100644
--- a/include/dahdi/kernel.h
+++ b/include/dahdi/kernel.h
@@ -65,6 +65,12 @@
 #define DAHDI_IRQ_HANDLER(a) static irqreturn_t a(int irq, void *dev_id, struct pt_regs *regs)
 #endif
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25)
+#ifdef CONFIG_PCI
+#include <linux/pci-aspm.h>
+#endif
+#endif
+
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
 #define HAVE_NET_DEVICE_OPS
 #endif
@@ -1362,6 +1368,16 @@ static inline short dahdi_txtone_nextsample(struct dahdi_chan *ss)
 #define fatal_signal_pending(p) \
 	(signal_pending((p)) && sigismember(&(p)->pending.signal, SIGKILL))
 
+#ifdef CONFIG_PCI
+#ifndef PCIE_LINK_STATE_L0S
+#define PCIE_LINK_STATE_L0S	1
+#define PCIE_LINK_STATE_L1	2
+#define PCIE_LINK_STATE_CLKPM	4
+#endif
+#define pci_disable_link_state dahdi_pci_disable_link_state
+void dahdi_pci_disable_link_state(struct pci_dev *pdev, int state);
+#endif /* CONFIG_PCI */
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22)
 
 #ifndef __packed                                                                                         
@@ -1389,6 +1405,7 @@ static inline int strcasecmp(const char *s1, const char *s2)
 	return c1 - c2;
 }
 #endif /* clamp_val */
+
 #endif /* 2.6.22 */
 #endif /* 2.6.25 */
 #endif /* 2.6.26 */