diff --git a/drivers/video/amba-clcd.c b/drivers/video/amba-clcd.c
index d1f80ba..fb8163d 100644
--- a/drivers/video/amba-clcd.c
+++ b/drivers/video/amba-clcd.c
@@ -351,7 +351,7 @@
 	}
 
 	fb->fb.fix.mmio_start	= fb->dev->res.start;
-	fb->fb.fix.mmio_len	= 4096;
+	fb->fb.fix.mmio_len	= resource_size(&fb->dev->res);
 
 	fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
 	if (!fb->regs) {