---

yaml
---
r: 36074
b: refs/heads/master
c: b56a5a2
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6d47a5e4c3f8b6458002065d98a9cc6ff90fb597
+refs/heads/master: b56a5a23bfecd9cac9187164a9d5f22d287c48b9

trunk/drivers/pci/pci.c

@@ -445,6 +445,51 @@ pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
 
 EXPORT_SYMBOL(pci_choose_state);
 
+static int pci_save_pcie_state(struct pci_dev *dev)
+{
+	int pos, i = 0;
+	struct pci_cap_saved_state *save_state;
+	u16 *cap;
+
+	pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
+	if (pos <= 0)
+		return 0;
+
+	save_state = kzalloc(sizeof(*save_state) + sizeof(u16) * 4, GFP_KERNEL);
+	if (!save_state) {
+		dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
+		return -ENOMEM;
+	}
+	cap = (u16 *)&save_state->data[0];
+
+	pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]);
+	pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
+	pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
+	pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
+	pci_add_saved_cap(dev, save_state);
+	return 0;
+}
+
+static void pci_restore_pcie_state(struct pci_dev *dev)
+{
+	int i = 0, pos;
+	struct pci_cap_saved_state *save_state;
+	u16 *cap;
+
+	save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
+	pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
+	if (!save_state || pos <= 0)
+		return;
+	cap = (u16 *)&save_state->data[0];
+
+	pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
+	pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
+	pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
+	pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
+	pci_remove_saved_cap(save_state);
+	kfree(save_state);
+}
+
 /**
  * pci_save_state - save the PCI configuration space of a device before suspending
  * @dev: - PCI device that we're dealing with
@@ -460,6 +505,8 @@ pci_save_state(struct pci_dev *dev)
 		return i;
 	if ((i = pci_save_msix_state(dev)) != 0)
 		return i;
+	if ((i = pci_save_pcie_state(dev)) != 0)
+		return i;
 	return 0;
 }
 
@@ -473,6 +520,9 @@ pci_restore_state(struct pci_dev *dev)
 	int i;
 	int val;
 
+	/* PCI Express register must be restored first */
+	pci_restore_pcie_state(dev);
+
 	/*
 	 * The Base Address register should be programmed before the command
 	 * register(s)