drm/sun4i: tcon: Introduce LVDS setup routine setting

Different sunxi flavors require slightly different sequence for enabling
LVDS output. This allows to differentiate between them.

Signed-off-by: Andrey Lebedev <andrey@lebedev.lt>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20200219180858.4806-2-andrey.lebedev@gmail.com

drivers/gpu/drm/sun4i/sun4i_tcon.h

@@ -228,6 +228,9 @@ struct sun4i_tcon_quirks {
 
 	/* callback to handle tcon muxing options */
 	int	(*set_mux)(struct sun4i_tcon *, const struct drm_encoder *);
+	/* handler for LVDS setup routine */
+	void	(*setup_lvds_phy)(struct sun4i_tcon *tcon,
+				  const struct drm_encoder *encoder);
 };
 
 struct sun4i_tcon {