[AGPGART] Suspend/Resume support for nVidia nForce AGP.

Based on a patch from the Ubuntu kernel.

Signed-off-by: Ben Collins <bcollins@ubuntu.com>
Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/char/agp/nvidia-agp.c b/drivers/char/agp/nvidia-agp.c
index 4c67135c12d8..b3a53e7f3602 100644
--- a/drivers/char/agp/nvidia-agp.c
+++ b/drivers/char/agp/nvidia-agp.c
@@ -376,6 +376,31 @@ static void __devexit agp_nvidia_remove(struct pci_dev *pdev)
         agp_put_bridge(bridge);
 }
 
+#ifdef CONFIG_PM
+static int agp_nvidia_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+        pci_save_state (pdev);
+        pci_set_power_state (pdev, 3);
+
+        return 0;
+}
+
+static int agp_nvidia_resume(struct pci_dev *pdev)
+{
+        struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
+
+        /* set power state 0 and restore PCI space */
+        pci_set_power_state (pdev, 0);
+        pci_restore_state(pdev);
+
+        /* reconfigure AGP hardware again */
+        nvidia_configure();
+
+        return 0;
+}
+#endif
+
+
 static struct pci_device_id agp_nvidia_pci_table[] = {
         {
         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
@@ -403,6 +428,10 @@ static struct pci_driver agp_nvidia_pci_driver = {
         .id_table       = agp_nvidia_pci_table,
         .probe          = agp_nvidia_probe,
         .remove         = agp_nvidia_remove,
+#ifdef CONFIG_PM
+        .suspend        = agp_nvidia_suspend,
+        .resume         = agp_nvidia_resume,
+#endif
 };
 
 static int __init agp_nvidia_init(void)