[PATCH] fbdev: video/tdfxfb.c warning fix

From: "Luiz Fernando N. Capitulino" <lcapitulino@prefeitura.sp.gov.br>

Fix this:

drivers/video/tdfxfb.c:1005: warning: `tdfxfb_cursor' defined but not used

and make the acceleration function selectable (like hgafb and tridentfb)

Geert says:

 tdfxfb_cursor() was not used before, causing a compiler warning. 
 tdfxfb_cursor() may work, but we don't know, so we didn't dare to enable it
 by default.  Now the user (he who has the hardware) can enable it, and tell
 us whether it works or not.

drivers/video/Kconfig

@@ -766,6 +766,14 @@ config FB_3DFX
 	  To compile this driver as a module, choose M here: the
 	  module will be called tdfxfb.
 
+config FB_3DFX_ACCEL
+	bool "3Dfx Banshee/Voodoo3 Acceleration functions (EXPERIMENTAL)"
+	depends on FB_3DFX && EXPERIMENTAL
+	---help---
+	This will compile the 3Dfx Banshee/Voodoo3 frame buffer device
+	with acceleration functions.
+
+
 config FB_VOODOO1
 	tristate "3Dfx Voodoo Graphics (sst1) support"
 	depends on FB && PCI

drivers/video/tdfxfb.c

@@ -166,7 +166,11 @@ static int tdfxfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *inf
 static void tdfxfb_fillrect(struct fb_info *info, const struct fb_fillrect *rect);
 static void tdfxfb_copyarea(struct fb_info *info, const struct fb_copyarea *area);  
 static void tdfxfb_imageblit(struct fb_info *info, const struct fb_image *image); 
+#ifdef CONFIG_FB_3DFX_ACCEL
 static int tdfxfb_cursor(struct fb_info *info, struct fb_cursor *cursor);
+#else /* !CONFIG_FB_3DFX_ACCEL */
+#define tdfxfb_cursor soft_cursor
+#endif /* CONFIG_FB_3DFX_ACCEL */
 static int banshee_wait_idle(struct fb_info *info);
 
 static struct fb_ops tdfxfb_ops = {
@@ -180,7 +184,7 @@ static struct fb_ops tdfxfb_ops = {
 	.fb_copyarea	= tdfxfb_copyarea,
 	.fb_imageblit	= tdfxfb_imageblit,
 	.fb_sync	= banshee_wait_idle,
-	.fb_cursor	= soft_cursor,
+	.fb_cursor	= tdfxfb_cursor,
 };
 
 /*
@@ -1001,6 +1005,7 @@ static void tdfxfb_imageblit(struct fb_info *info, const struct fb_image *image)
 	banshee_wait_idle(info);
 }
 
+#ifdef CONFIG_FB_3DFX_ACCEL
 static int tdfxfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
 {
 	struct tdfx_par *par = (struct tdfx_par *) info->par;
@@ -1137,6 +1142,7 @@ static int tdfxfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
 	spin_unlock_irqrestore(&par->DAClock, flags);
 	return 0;
 }
+#endif /* CONFIG_FB_3DFX_ACCEL */
 
 /**
  *      tdfxfb_probe - Device Initializiation