AOI position cannot be negative.

Signed-off-by: York Sun <yorksun@freescale.com>
---
 drivers/video/fsl-diu-fb.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/video/fsl-diu-fb.c b/drivers/video/fsl-diu-fb.c
index d67e79b..8898d2a 100644
--- a/drivers/video/fsl-diu-fb.c
+++ b/drivers/video/fsl-diu-fb.c
@@ -479,6 +479,10 @@ static void adjust_aoi_size_position(struct fb_var_screeninfo *var,
 	base_plane_width = machine_data->fsl_diu_info[0]->var.xres;
 	base_plane_height = machine_data->fsl_diu_info[0]->var.yres;
 
+	if (mfbi->x_aoi_d < 0)
+		mfbi->x_aoi_d = 0;
+	if (mfbi->y_aoi_d < 0)
+		mfbi->y_aoi_d = 0;
 	switch (index) {
 	case 0:
 		if (mfbi->x_aoi_d != 0)
-- 
1.5.2.2

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