drm/omap: Add support for drm_panel

Hook up drm_panel support in the omapdrm driver. The change is
relatively simply as the way has been paved by drm_bridge support
already. In addition to looking up, attaching to and detaching from the
panel, we only need to add panel support in the connector .get_modes()
handler, take connector bus flags (set by the panel) into account, and
enable/disable the panel in the encoder enable/disable operations
handlers.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

3 files changed, 14 insertions, 6 deletions

diff --git a/drivers/gpu/drm/omapdrm/dss/base.c b/drivers/gpu/drm/omapdrm/dss/base.c
index 09c9f2971aa2..3c088cd2ceab 100644
--- a/drivers/gpu/drm/omapdrm/dss/base.c
+++ b/drivers/gpu/drm/omapdrm/dss/base.c
@@ -157,7 +157,8 @@ struct omap_dss_device *omapdss_device_next_output(struct omap_dss_device *from)
 			goto done;
 		}
 
-		if (dssdev->id && (dssdev->next || dssdev->bridge))
+		if (dssdev->id &&
+		    (dssdev->next || dssdev->bridge || dssdev->panel))
 			goto done;
 	}
 
@@ -192,10 +193,11 @@ int omapdss_device_connect(struct dss_device *dss,
 	if (!dst) {
 		/*
 		 * The destination is NULL when the source is connected to a
-		 * bridge instead of a DSS device. Stop here, we will attach the
-		 * bridge later when we will have a DRM encoder.
+		 * bridge or panel instead of a DSS device. Stop here, we will
+		 * attach the bridge or panel later when we will have a DRM
+		 * encoder.
 		 */
-		return src && src->bridge ? 0 : -EINVAL;
+		return src && (src->bridge || src->panel) ? 0 : -EINVAL;
 	}
 
 	if (omapdss_device_is_connected(dst))
@@ -223,7 +225,7 @@ void omapdss_device_disconnect(struct omap_dss_device *src,
 		dst ? dev_name(dst->dev) : "NULL");
 
 	if (!dst) {
-		WARN_ON(!src->bridge);
+		WARN_ON(!src->bridge && !src->panel);
 		return;
 	}
 
diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
index f47e9b94288f..0c734d1f89e1 100644
--- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
+++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
@@ -411,6 +411,7 @@ struct omap_dss_device {
 	struct dss_device *dss;
 	struct omap_dss_device *next;
 	struct drm_bridge *bridge;
+	struct drm_panel *panel;
 
 	struct list_head list;
 
diff --git a/drivers/gpu/drm/omapdrm/dss/output.c b/drivers/gpu/drm/omapdrm/dss/output.c
index 2a53025c2fde..10a9ee5cdc61 100644
--- a/drivers/gpu/drm/omapdrm/dss/output.c
+++ b/drivers/gpu/drm/omapdrm/dss/output.c
@@ -22,6 +22,8 @@
 #include <linux/of.h>
 #include <linux/of_graph.h>
 
+#include <drm/drm_panel.h>
+
 #include "dss.h"
 #include "omapdss.h"
 
@@ -37,6 +39,9 @@ int omapdss_device_init_output(struct omap_dss_device *out)
 
 	out->next = omapdss_find_device_by_node(remote_node);
 	out->bridge = of_drm_find_bridge(remote_node);
+	out->panel = of_drm_find_panel(remote_node);
+	if (IS_ERR(out->panel))
+		out->panel = NULL;
 
 	of_node_put(remote_node);
 
@@ -47,7 +52,7 @@ int omapdss_device_init_output(struct omap_dss_device *out)
 		return -EINVAL;
 	}
 
-	return out->next || out->bridge ? 0 : -EPROBE_DEFER;
+	return out->next || out->bridge || out->panel ? 0 : -EPROBE_DEFER;
 }
 EXPORT_SYMBOL(omapdss_device_init_output);