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-rw-r--r--include/linux/vgaarb.h14
1 files changed, 12 insertions, 2 deletions
diff --git a/include/linux/vgaarb.h b/include/linux/vgaarb.h
index e81c64af80c..2dfaa293ae8 100644
--- a/include/linux/vgaarb.h
+++ b/include/linux/vgaarb.h
@@ -1,5 +1,6 @@
/*
- * vgaarb.c
+ * The VGA aribiter manages VGA space routing and VGA resource decode to
+ * allow multiple VGA devices to be used in a system in a safe way.
*
* (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
* (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com>
@@ -41,7 +42,7 @@
* interrupts at any time.
*/
extern void vga_set_legacy_decoding(struct pci_dev *pdev,
- unsigned int decodes);
+ unsigned int decodes);
/**
* vga_get - acquire & locks VGA resources
@@ -193,8 +194,17 @@ static inline int vga_conflicts(struct pci_dev *p1, struct pci_dev *p2)
* They driver will get a callback when VGA arbitration is first used
* by userspace since we some older X servers have issues.
*/
+#if defined(CONFIG_VGA_ARB)
int vga_client_register(struct pci_dev *pdev, void *cookie,
void (*irq_set_state)(void *cookie, bool state),
unsigned int (*set_vga_decode)(void *cookie, bool state));
+#else
+static inline int vga_client_register(struct pci_dev *pdev, void *cookie,
+ void (*irq_set_state)(void *cookie, bool state),
+ unsigned int (*set_vga_decode)(void *cookie, bool state))
+{
+ return 0;
+}
+#endif
#endif /* LINUX_VGA_H */