drm/imx: ipuv3-plane: Add more thorough checks for plane parameter limitations

The IPU addresses multiplanar formats using a base address and relative
offsets for the secondary planes. Since those offsets must be positive
and not too large, and none of the plane parameters except the base address
may be changed while scanout is active, store the pitches and u/v offsets
and check all values against IDMAC limitations.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/gpu/drm/imx/ipuv3-plane.h

@@ -29,6 +29,10 @@ struct ipu_plane {
 	int			w;
 	int			h;
 
+	unsigned int		u_offset;
+	unsigned int		v_offset;
+	unsigned int		stride[2];
+
 	bool			enabled;
 };