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path: root/drivers/pci/pci.c
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Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c70
1 files changed, 56 insertions, 14 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 16fd0d4c3166..34bf0fdf5047 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -681,11 +681,34 @@ 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 +721,22 @@ 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 +746,7 @@ 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 +754,22 @@ 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++]);
}