video: mxsfb: enable setting ENABLE negative polarity

ENABLE signal can now be flipped by writing its bitmask on vdctrl0
register.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Reviewed-by: Anatolij Gustschin <agust@denx.de>
diff --git a/drivers/video/mxsfb.c b/drivers/video/mxsfb.c
index 648e1c2..8a5a61c 100644
--- a/drivers/video/mxsfb.c
+++ b/drivers/video/mxsfb.c
@@ -131,6 +131,9 @@
 		vdctrl0 |= LCDIF_VDCTRL0_VSYNC_POL;
 	if(flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
 		vdctrl0 |= LCDIF_VDCTRL0_DOTCLK_POL;
+	if(flags & DISPLAY_FLAGS_DE_HIGH)
+		vdctrl0 |= LCDIF_VDCTRL0_ENABLE_POL;
+
 	writel(vdctrl0, &regs->hw_lcdif_vdctrl0);
 	writel(timings->vback_porch.typ + timings->vfront_porch.typ +
 		timings->vsync_len.typ + timings->vactive.typ,