diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
index f427c0914907..3da42c8ca6e3 100644
--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -300,12 +300,6 @@ static void fbtft_mkdirty(struct fb_info *info, int y, int height)
 	struct fbtft_par *par = info->par;
 	struct fb_deferred_io *fbdefio = info->fbdefio;
 
-	/* special case, needed ? */
-	if (y == -1) {
-		y = 0;
-		height = info->var.yres;
-	}
-
 	/* Mark display lines/area as dirty */
 	spin_lock(&par->dirty_lock);
 	if (y < par->dirty_lines_start)
@@ -413,9 +407,12 @@ static int fbtft_fb_blank(int blank, struct fb_info *info)
 static void fbtft_ops_damage_range(struct fb_info *info, off_t off, size_t len)
 {
 	struct fbtft_par *par = info->par;
+	u32 start, end;
 
-	/* TODO: only mark changed area update all for now */
-	par->fbtftops.mkdirty(info, -1, 0);
+	start = off / info->fix.line_length;
+	end = (off + len - 1) / info->fix.line_length;
+
+	par->fbtftops.mkdirty(info, start, end - start + 1);
 }
 
 static void fbtft_ops_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height)