agp/amd-k7: Suspend support for AMD K7 GART driver

Reinitialize bridge registers after suspend, but avoid repeating the ioremap

Tested and works on AMD761

Signed-off-by: Stuart Bennett <stuart@freedesktop.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 32 insertions, 6 deletions

diff --git a/drivers/char/agp/amd-k7-agp.c b/drivers/char/agp/amd-k7-agp.c
index e280531843be..c9e3310a7d9d 100644
--- a/drivers/char/agp/amd-k7-agp.c
+++ b/drivers/char/agp/amd-k7-agp.c
@@ -223,12 +223,14 @@ static int amd_irongate_configure(void)
 
         current_size = A_SIZE_LVL2(agp_bridge->current_size);
 
-        /* Get the memory mapped registers */
-        pci_read_config_dword(agp_bridge->dev, AMD_MMBASE, &temp);
-        temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
-        amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
-        if (!amd_irongate_private.registers)
-                return -ENOMEM;
+        if (!amd_irongate_private.registers) {
+                /* Get the memory mapped registers */
+                pci_read_config_dword(agp_bridge->dev, AMD_MMBASE, &temp);
+                temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
+                amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
+                if (!amd_irongate_private.registers)
+                        return -ENOMEM;
+        }
 
         /* Write out the address of the gatt table */
         writel(agp_bridge->gatt_bus_addr, amd_irongate_private.registers+AMD_ATTBASE);
@@ -490,6 +492,26 @@ static void __devexit agp_amdk7_remove(struct pci_dev *pdev)
         agp_put_bridge(bridge);
 }
 
+#ifdef CONFIG_PM
+
+static int agp_amdk7_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+        pci_save_state(pdev);
+        pci_set_power_state(pdev, pci_choose_state(pdev, state));
+
+        return 0;
+}
+
+static int agp_amdk7_resume(struct pci_dev *pdev)
+{
+        pci_set_power_state(pdev, PCI_D0);
+        pci_restore_state(pdev);
+
+        return amd_irongate_driver.configure();
+}
+
+#endif /* CONFIG_PM */
+
 /* must be the same order as name table above */
 static struct pci_device_id agp_amdk7_pci_table[] = {
         {
@@ -526,6 +548,10 @@ static struct pci_driver agp_amdk7_pci_driver = {
         .id_table       = agp_amdk7_pci_table,
         .probe          = agp_amdk7_probe,
         .remove         = agp_amdk7_remove,
+#ifdef CONFIG_PM
+        .suspend        = agp_amdk7_suspend,
+        .resume         = agp_amdk7_resume,
+#endif
 };
 
 static int __init agp_amdk7_init(void)