From: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>
The DE3 display engine supports YUV formats in addition to RGB.
Add an optional format enumeration function to the engine.
Signed-off-by: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>
Signed-off-by: Ryan Walklin <ryan@xxxxxxxxxxxxx>
---
drivers/gpu/drm/sun4i/sunxi_engine.h | 29 ++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h b/drivers/gpu/drm/sun4i/sunxi_engine.h
index ec8cf9b2bda41..98a78990fa870 100644
--- a/drivers/gpu/drm/sun4i/sunxi_engine.h
+++ b/drivers/gpu/drm/sun4i/sunxi_engine.h
@@ -120,6 +120,17 @@ struct sunxi_engine_ops {
*/
void (*mode_set)(struct sunxi_engine *engine,
const struct drm_display_mode *mode);
+
+ /**
+ * @get_supported_fmts
+ *
+ * This callback is used to enumerate all supported output
+ * formats by the engine. They are used for bridge format
+ * negotiation.
+ *
+ * This function is optional.
+ */
+ u32 *(*get_supported_fmts)(struct sunxi_engine *engine, u32 *num);
};
/**
@@ -208,4 +219,22 @@ sunxi_engine_mode_set(struct sunxi_engine *engine,
if (engine->ops && engine->ops->mode_set)
engine->ops->mode_set(engine, mode);
}
+
+/**
+ * sunxi_engine_get_supported_formats - Provide array of supported formats
+ * @engine: pointer to the engine
+ * @num: pointer to variable, which will hold number of formats
+ *
+ * This list can be used for format negotiation by bridge.
+ */
+static inline u32 *
+sunxi_engine_get_supported_formats(struct sunxi_engine *engine, u32 *num)
+{
+ if (engine->ops && engine->ops->get_supported_fmts)
+ return engine->ops->get_supported_fmts(engine, num);
+
+ *num = 0;
+
+ return NULL;
+}
#endif /* _SUNXI_ENGINE_H_ */
--
2.45.2
