[PATCH] fbcon: Console Rotation - Add support for 90-degree console rotation

Add support for 90-degree (clockwise) rotation of the console.  To activate,
boot with:

fbcon=rotate:1
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/video/console/Makefile

@@ -32,7 +32,7 @@ ifeq ($(CONFIG_FB_TILEBLITTING),y)
 obj-$(CONFIG_FRAMEBUFFER_CONSOLE)     += tileblit.o
 endif
 ifeq ($(CONFIG_FRAMEBUFFER_CONSOLE_ROTATION),y)
-obj-$(CONFIG_FRAMEBUFFER_CONSOLE)     += fbcon_rotate.o
+obj-$(CONFIG_FRAMEBUFFER_CONSOLE)     += fbcon_rotate.o fbcon_cw.o
 endif
 
 obj-$(CONFIG_FB_STI)              += sticore.o font.o

drivers/video/console/fbcon.c

@@ -207,12 +207,25 @@ static irqreturn_t fb_vbl_detect(int irq, void *dummy, struct pt_regs *fp)
 }
 #endif
 
+#ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
+static inline void fbcon_set_rotation(struct fb_info *info, struct display *p)
+{
+	struct fbcon_ops *ops = info->fbcon_par;
+
+	if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
+	    p->con_rotate < 4)
+		ops->rotate = p->con_rotate;
+	else
+		ops->rotate = 0;
+}
+#else
 static inline void fbcon_set_rotation(struct fb_info *info, struct display *p)
 {
 	struct fbcon_ops *ops = info->fbcon_par;
 
 	ops->rotate = FB_ROTATE_UR;
 }
+#endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 
 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 {

drivers/video/console/fbcon_rotate.c

@@ -97,6 +97,12 @@ static int fbcon_rotate_font(struct fb_info *info, struct vc_data *vc,
 void fbcon_set_rotate(struct fbcon_ops *ops)
 {
 	ops->rotate_font = fbcon_rotate_font;
+
+	switch(ops->rotate) {
+	case FB_ROTATE_CW:
+		fbcon_rotate_cw(ops);
+		break;
+	}
 }
 EXPORT_SYMBOL(fbcon_set_rotate);
 

drivers/video/console/fbcon_rotate.h

@@ -99,4 +99,5 @@ static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
 	}
 }
 
+extern void fbcon_rotate_cw(struct fbcon_ops *ops);
 #endif