1 files changed, 58 insertions, 15 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 16fd0d4c3166..1a91bf9687af 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -557,7 +557,8 @@ static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state)
         } else {
                 error = -ENODEV;
                 /* Fall back to PCI_D0 if native PM is not supported */
-                pci_update_current_state(dev, PCI_D0);
+                if (!dev->pm_cap)
+                        dev->current_state = PCI_D0;
         }
 
         return error;
@@ -681,11 +682,34 @@ EXPORT_SYMBOL(pci_choose_state);
 
 #define PCI_EXP_SAVE_REGS       7
 
+#define pcie_cap_has_devctl(type, flags)        1
+#define pcie_cap_has_lnkctl(type, flags)                \
+                ((flags & PCI_EXP_FLAGS_VERS) > 1 ||    \
+                 (type == PCI_EXP_TYPE_ROOT_PORT ||     \
+                  type == PCI_EXP_TYPE_ENDPOINT ||      \
+                  type == PCI_EXP_TYPE_LEG_END))
+#define pcie_cap_has_sltctl(type, flags)                \
+                ((flags & PCI_EXP_FLAGS_VERS) > 1 ||    \
+                 ((type == PCI_EXP_TYPE_ROOT_PORT) ||   \
+                  (type == PCI_EXP_TYPE_DOWNSTREAM &&   \
+                   (flags & PCI_EXP_FLAGS_SLOT))))
+#define pcie_cap_has_rtctl(type, flags)                 \
+                ((flags & PCI_EXP_FLAGS_VERS) > 1 ||    \
+                 (type == PCI_EXP_TYPE_ROOT_PORT ||     \
+                  type == PCI_EXP_TYPE_RC_EC))
+#define pcie_cap_has_devctl2(type, flags)               \
+                ((flags & PCI_EXP_FLAGS_VERS) > 1)
+#define pcie_cap_has_lnkctl2(type, flags)               \
+                ((flags & PCI_EXP_FLAGS_VERS) > 1)
+#define pcie_cap_has_sltctl2(type, flags)               \
+                ((flags & PCI_EXP_FLAGS_VERS) > 1)
+
 static int pci_save_pcie_state(struct pci_dev *dev)
 {
         int pos, i = 0;
         struct pci_cap_saved_state *save_state;
         u16 *cap;
+        u16 flags;
 
         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
         if (pos <= 0)
@@ -698,13 +722,22 @@ static int pci_save_pcie_state(struct pci_dev *dev)
         }
         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_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &cap[i++]);
-        pci_read_config_word(dev, pos + PCI_EXP_LNKCTL2, &cap[i++]);
-        pci_read_config_word(dev, pos + PCI_EXP_SLTCTL2, &cap[i++]);
+        pci_read_config_word(dev, pos + PCI_EXP_FLAGS, &flags);
+
+        if (pcie_cap_has_devctl(dev->pcie_type, flags))
+                pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]);
+        if (pcie_cap_has_lnkctl(dev->pcie_type, flags))
+                pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
+        if (pcie_cap_has_sltctl(dev->pcie_type, flags))
+                pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
+        if (pcie_cap_has_rtctl(dev->pcie_type, flags))
+                pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
+        if (pcie_cap_has_devctl2(dev->pcie_type, flags))
+                pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &cap[i++]);
+        if (pcie_cap_has_lnkctl2(dev->pcie_type, flags))
+                pci_read_config_word(dev, pos + PCI_EXP_LNKCTL2, &cap[i++]);
+        if (pcie_cap_has_sltctl2(dev->pcie_type, flags))
+                pci_read_config_word(dev, pos + PCI_EXP_SLTCTL2, &cap[i++]);
 
         return 0;
 }
@@ -714,6 +747,7 @@ static void pci_restore_pcie_state(struct pci_dev *dev)
         int i = 0, pos;
         struct pci_cap_saved_state *save_state;
         u16 *cap;
+        u16 flags;
 
         save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
@@ -721,13 +755,22 @@ static void pci_restore_pcie_state(struct pci_dev *dev)
                 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_write_config_word(dev, pos + PCI_EXP_DEVCTL2, cap[i++]);
-        pci_write_config_word(dev, pos + PCI_EXP_LNKCTL2, cap[i++]);
-        pci_write_config_word(dev, pos + PCI_EXP_SLTCTL2, cap[i++]);
+        pci_read_config_word(dev, pos + PCI_EXP_FLAGS, &flags);
+
+        if (pcie_cap_has_devctl(dev->pcie_type, flags))
+                pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
+        if (pcie_cap_has_lnkctl(dev->pcie_type, flags))
+                pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
+        if (pcie_cap_has_sltctl(dev->pcie_type, flags))
+                pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
+        if (pcie_cap_has_rtctl(dev->pcie_type, flags))
+                pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
+        if (pcie_cap_has_devctl2(dev->pcie_type, flags))
+                pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, cap[i++]);
+        if (pcie_cap_has_lnkctl2(dev->pcie_type, flags))
+                pci_write_config_word(dev, pos + PCI_EXP_LNKCTL2, cap[i++]);
+        if (pcie_cap_has_sltctl2(dev->pcie_type, flags))
+                pci_write_config_word(dev, pos + PCI_EXP_SLTCTL2, cap[i++]);
 }