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authorMichael S. Tsirkin <mst@mellanox.co.il>2006-08-21 09:22:22 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-09-26 20:43:53 -0400
commitb56a5a23bfecd9cac9187164a9d5f22d287c48b9 (patch)
treeb0c713c6a51edb1491fdf6545a5d2742f2f77630 /drivers/pci/pci.c
parent6d47a5e4c3f8b6458002065d98a9cc6ff90fb597 (diff)
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>
Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 590f4e6f505d..a544997399b3 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -445,6 +445,51 @@ pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
445 445
446EXPORT_SYMBOL(pci_choose_state); 446EXPORT_SYMBOL(pci_choose_state);
447 447
448static int pci_save_pcie_state(struct pci_dev *dev)
449{
450 int pos, i = 0;
451 struct pci_cap_saved_state *save_state;
452 u16 *cap;
453
454 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
455 if (pos <= 0)
456 return 0;
457
458 save_state = kzalloc(sizeof(*save_state) + sizeof(u16) * 4, GFP_KERNEL);
459 if (!save_state) {
460 dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
461 return -ENOMEM;
462 }
463 cap = (u16 *)&save_state->data[0];
464
465 pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]);
466 pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
467 pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
468 pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
469 pci_add_saved_cap(dev, save_state);
470 return 0;
471}
472
473static void pci_restore_pcie_state(struct pci_dev *dev)
474{
475 int i = 0, pos;
476 struct pci_cap_saved_state *save_state;
477 u16 *cap;
478
479 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
480 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
481 if (!save_state || pos <= 0)
482 return;
483 cap = (u16 *)&save_state->data[0];
484
485 pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
486 pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
487 pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
488 pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
489 pci_remove_saved_cap(save_state);
490 kfree(save_state);
491}
492
448/** 493/**
449 * pci_save_state - save the PCI configuration space of a device before suspending 494 * pci_save_state - save the PCI configuration space of a device before suspending
450 * @dev: - PCI device that we're dealing with 495 * @dev: - PCI device that we're dealing with
@@ -460,6 +505,8 @@ pci_save_state(struct pci_dev *dev)
460 return i; 505 return i;
461 if ((i = pci_save_msix_state(dev)) != 0) 506 if ((i = pci_save_msix_state(dev)) != 0)
462 return i; 507 return i;
508 if ((i = pci_save_pcie_state(dev)) != 0)
509 return i;
463 return 0; 510 return 0;
464} 511}
465 512
@@ -473,6 +520,9 @@ pci_restore_state(struct pci_dev *dev)
473 int i; 520 int i;
474 int val; 521 int val;
475 522
523 /* PCI Express register must be restored first */
524 pci_restore_pcie_state(dev);
525
476 /* 526 /*
477 * The Base Address register should be programmed before the command 527 * The Base Address register should be programmed before the command
478 * register(s) 528 * register(s)