[PATCH] PCI: acpi tg3 ethernet not coming back properly after S3 suspendon DellM70

This patch, is based on kernel 2.6.12, provides a fix for PCIe
port bus driver suspend/resume.

Signed-off-by: T. Long Nguyen <tom.l.nguyen@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 78 insertions, 1 deletions

diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c
index e9095ee508e..30bac7ed7c1 100644
--- a/drivers/pci/pcie/portdrv_pci.c
+++ b/drivers/pci/pcie/portdrv_pci.c
@@ -29,6 +29,78 @@ MODULE_LICENSE("GPL");
 /* global data */
 static const char device_name[] = "pcieport-driver";
 
+static void pci_save_msi_state(struct pci_dev *dev)
+{
+        struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
+        int i = 0, pos;
+        u16 control;
+
+        if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
+                return;
+
+        pci_read_config_dword(dev, pos, &p_ext->saved_msi_config_space[i++]);
+        control = p_ext->saved_msi_config_space[0] >> 16;
+        pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
+                &p_ext->saved_msi_config_space[i++]);
+        if (control & PCI_MSI_FLAGS_64BIT) {
+                pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
+                        &p_ext->saved_msi_config_space[i++]);
+                pci_read_config_dword(dev, pos + PCI_MSI_DATA_64,
+                        &p_ext->saved_msi_config_space[i++]);
+        } else
+                pci_read_config_dword(dev, pos + PCI_MSI_DATA_32,
+                        &p_ext->saved_msi_config_space[i++]);
+        if (control & PCI_MSI_FLAGS_MASKBIT)
+                pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT,
+                        &p_ext->saved_msi_config_space[i++]);
+}
+
+static void pci_restore_msi_state(struct pci_dev *dev)
+{
+        struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
+        int i = 0, pos;
+        u16 control;
+
+        if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
+                return;
+
+        control = p_ext->saved_msi_config_space[i++] >> 16;
+        pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
+        pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
+                p_ext->saved_msi_config_space[i++]);
+        if (control & PCI_MSI_FLAGS_64BIT) {
+                pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
+                        p_ext->saved_msi_config_space[i++]);
+                pci_write_config_dword(dev, pos + PCI_MSI_DATA_64,
+                        p_ext->saved_msi_config_space[i++]);
+        } else
+                pci_write_config_dword(dev, pos + PCI_MSI_DATA_32,
+                        p_ext->saved_msi_config_space[i++]);
+        if (control & PCI_MSI_FLAGS_MASKBIT)
+                pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT,
+                        p_ext->saved_msi_config_space[i++]);
+}
+
+static void pcie_portdrv_save_config(struct pci_dev *dev)
+{
+        struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
+
+        pci_save_state(dev);
+        if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
+                pci_save_msi_state(dev);
+}
+
+static void pcie_portdrv_restore_config(struct pci_dev *dev)
+{
+        struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
+
+        pci_restore_state(dev);
+        if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
+                pci_restore_msi_state(dev);
+        pci_enable_device(dev);
+        pci_set_master(dev);
+}
+
 /*
  * pcie_portdrv_probe - Probe PCI-Express port devices
  * @dev: PCI-Express port device being probed
@@ -64,16 +136,21 @@ static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
 static void pcie_portdrv_remove (struct pci_dev *dev)
 {
         pcie_port_device_remove(dev);
+        kfree(pci_get_drvdata(dev));
 }
 
 #ifdef CONFIG_PM
 static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
 {
-        return pcie_port_device_suspend(dev, state);
+        int ret = pcie_port_device_suspend(dev, state);
+
+        pcie_portdrv_save_config(dev);
+        return ret;
 }
 
 static int pcie_portdrv_resume (struct pci_dev *dev)
 {
+        pcie_portdrv_restore_config(dev);
         return pcie_port_device_resume(dev);
 }
 #endif