[RFC PATCH 2/3] drm: bridge: panel: allow override of the bus format

[Peter Rosin]

Useful if the bridge does some kind of conversion of the bus format.

Signed-off-by: Peter Rosin <p...@axentia.se>
---
 drivers/gpu/drm/bridge/panel.c | 22 +++++++++++++++++++++-
 include/drm/drm_bridge.h       |  1 +
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 6d99d4a3beb3..ccef0283ff41 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -22,6 +22,7 @@ struct panel_bridge {
        struct drm_connector connector;
        struct drm_panel *panel;
        u32 connector_type;
+       u32 bus_format;
 };
 
 static inline struct panel_bridge *
@@ -40,8 +41,15 @@ static int panel_bridge_connector_get_modes(struct 
drm_connector *connector)
 {
        struct panel_bridge *panel_bridge =
                drm_connector_to_panel_bridge(connector);
+       int ret;
+
+       ret = drm_panel_get_modes(panel_bridge->panel);
+
+       if (panel_bridge->bus_format)
+               drm_display_info_set_bus_formats(&connector->display_info,
+                                                &panel_bridge->bus_format, 1);
 
-       return drm_panel_get_modes(panel_bridge->panel);
+       return ret;
 }
 
 static const struct drm_connector_helper_funcs
@@ -203,6 +211,18 @@ void drm_panel_bridge_remove(struct drm_bridge *bridge)
 }
 EXPORT_SYMBOL(drm_panel_bridge_remove);
 
+void drm_panel_bridge_set_bus_format(struct drm_bridge *bridge, u32 bus_format)
+{
+       struct panel_bridge *panel_bridge;
+
+       if (!bridge)
+               return;
+
+       panel_bridge = drm_bridge_to_panel_bridge(bridge);
+       panel_bridge->bus_format = bus_format;
+}
+EXPORT_SYMBOL(drm_panel_bridge_set_bus_format);
+
 static void devm_drm_panel_bridge_release(struct device *dev, void *res)
 {
        struct drm_bridge **bridge = res;
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 682d01ba920c..81903b92f187 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -268,6 +268,7 @@ void drm_bridge_enable(struct drm_bridge *bridge);
 struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel,
                                        u32 connector_type);
 void drm_panel_bridge_remove(struct drm_bridge *bridge);
+void drm_panel_bridge_set_bus_format(struct drm_bridge *bridge, u32 
bus_format);
 struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
                                             struct drm_panel *panel,
                                             u32 connector_type);
-- 
2.11.0