Merge branch 'x86-pci-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[cascardo/linux.git] / drivers / pci / pci.c

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 2b9ac9e..5b548ae 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2754,6 +2754,23 @@ int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type)
        return 0;
 }
 
+/* Some architectures require additional programming to enable VGA */
+static arch_set_vga_state_t arch_set_vga_state;
+
+void __init pci_register_set_vga_state(arch_set_vga_state_t func)
+{
+       arch_set_vga_state = func;      /* NULL disables */
+}
+
+static int pci_set_vga_state_arch(struct pci_dev *dev, bool decode,
+                     unsigned int command_bits, bool change_bridge)
+{
+       if (arch_set_vga_state)
+               return arch_set_vga_state(dev, decode, command_bits,
+                                               change_bridge);
+       return 0;
+}
+
 /**
  * pci_set_vga_state - set VGA decode state on device and parents if requested
  * @dev: the PCI device
@@ -2767,9 +2784,15 @@ int pci_set_vga_state(struct pci_dev *dev, bool decode,
        struct pci_bus *bus;
        struct pci_dev *bridge;
        u16 cmd;
+       int rc;
 
        WARN_ON(command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY));
 
+       /* ARCH specific VGA enables */
+       rc = pci_set_vga_state_arch(dev, decode, command_bits, change_bridge);
+       if (rc)
+               return rc;
+
        pci_read_config_word(dev, PCI_COMMAND, &cmd);
        if (decode == true)
                cmd |= command_bits;
@@ -2984,6 +3007,7 @@ EXPORT_SYMBOL(pcim_pin_device);
 EXPORT_SYMBOL(pci_disable_device);
 EXPORT_SYMBOL(pci_find_capability);
 EXPORT_SYMBOL(pci_bus_find_capability);
+EXPORT_SYMBOL(pci_register_set_vga_state);
 EXPORT_SYMBOL(pci_release_regions);
 EXPORT_SYMBOL(pci_request_regions);
 EXPORT_SYMBOL(pci_request_regions_exclusive);
@@ -3015,4 +3039,3 @@ EXPORT_SYMBOL(pci_target_state);
 EXPORT_SYMBOL(pci_prepare_to_sleep);
 EXPORT_SYMBOL(pci_back_from_sleep);
 EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);
-