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PCI: Restore PCI Express capability registers after PM event 

Restore PCI Express capability registers after PM event.
This includes maxumum MTU for PCI express and other vital data.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael S. Tsirkin 2006-08-21 16:22:22 +03:00 committed by Greg Kroah-Hartman
parent 6d47a5e4c3
commit b56a5a23bf
1 changed files with 50 additions and 0 deletions
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50
drivers/pci/pci.c
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@ -445,6 +445,51 @@ pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
EXPORT_SYMBOL(pci_choose_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 * pci_save_state - save the PCI configuration space of a device before suspending
* @dev: - PCI device that we're dealing with * @dev: - PCI device that we're dealing with
@ -460,6 +505,8 @@ pci_save_state(struct pci_dev *dev)
return i; return i;
if ((i = pci_save_msix_state(dev)) != 0) if ((i = pci_save_msix_state(dev)) != 0)
return i; return i;
if ((i = pci_save_pcie_state(dev)) != 0)
return i;
return 0; return 0;
} }
@ -473,6 +520,9 @@ pci_restore_state(struct pci_dev *dev)
int i; int i;
int val; int val;
/* PCI Express register must be restored first */
pci_restore_pcie_state(dev);
/* /*
* The Base Address register should be programmed before the command * The Base Address register should be programmed before the command
* register(s) * register(s)