nvidiafb: Enable debugging messages a Kconfig option

Let the user enable debugging messages in nvidiafb.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/Kconfig

@@ -796,6 +796,15 @@ config FB_NVIDIA_I2C
 	  independently validate video mode parameters, you should say Y
 	  here.
 
+config FB_NVIDIA_DEBUG
+	bool "Lots of debug output"
+	depends on FB_NVIDIA
+	default n
+	help
+	  Say Y here if you want the nVidia driver to output all sorts
+	  of debugging information to provide to the maintainer when
+	  something goes wrong.
+
 config FB_NVIDIA_BACKLIGHT
 	bool "Support for backlight control"
 	depends on FB_NVIDIA
@@ -835,7 +844,7 @@ config FB_RIVA_I2C
 	  here.
 
 config FB_RIVA_DEBUG
-	bool "Lots of debug output from Riva(nVidia) driver"
+	bool "Lots of debug output"
 	depends on FB_RIVA
 	default n
 	help

drivers/video/nvidia/nvidia.c

@@ -37,7 +37,6 @@
 #include "nv_proto.h"
 #include "nv_dma.h"
 
-#undef CONFIG_FB_NVIDIA_DEBUG
 #ifdef CONFIG_FB_NVIDIA_DEBUG
 #define NVTRACE          printk
 #else