drm/omap: Add dispc_mgr_get_supported_outputs()

We are removing the use of the 'struct omap_overlay_manager' from
omapdrm, and one part of that is removing the use of
mgr->supported_outputs field.

This patch adds dispc_mgr_get_supported_outputs() function which can be
used instead of mgr->supported_outputs. omap_crtc.c is changed to use
the new function.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/dispc.c

@@ -2910,6 +2910,12 @@ bool dispc_ovl_enabled(enum omap_plane plane)
 }
 EXPORT_SYMBOL(dispc_ovl_enabled);
 
+enum omap_dss_output_id dispc_mgr_get_supported_outputs(enum omap_channel channel)
+{
+	return dss_feat_get_supported_outputs(channel);
+}
+EXPORT_SYMBOL(dispc_mgr_get_supported_outputs);
+
 void dispc_mgr_enable(enum omap_channel channel, bool enable)
 {
 	mgr_fld_write(channel, DISPC_MGR_FLD_ENABLE, enable);

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -58,6 +58,8 @@ int dispc_ovl_setup(enum omap_plane plane, const struct omap_overlay_info *oi,
 		bool replication, const struct omap_video_timings *mgr_timings,
 		bool mem_to_mem);
 
+enum omap_dss_output_id dispc_mgr_get_supported_outputs(enum omap_channel channel);
+
 struct dss_mgr_ops {
 	int (*connect)(struct omap_overlay_manager *mgr,
 		struct omap_dss_device *dst);

drivers/gpu/drm/omapdrm/omap_crtc.c

@@ -112,7 +112,7 @@ static int omap_crtc_dss_connect(struct omap_overlay_manager *mgr,
 	if (mgr->output)
 		return -EINVAL;
 
-	if ((mgr->supported_outputs & dst->id) == 0)
+	if ((dispc_mgr_get_supported_outputs(mgr->id) & dst->id) == 0)
 		return -EINVAL;
 
 	dst->manager = mgr;