[PATCH RFC 8/8] drm/meson: Output in YUV444 if sink supports it

[narmstrong@baylibre.com (Neil Armstrong)]

With the YUV420 handling, we can dynamically setup the HDMI output
pixel format depending on the mode and connector info.
So now, we can output in YUV444, which is the native video pipeline
format, directly to the HDMI Sink if it's supported without
necessarily involving the HDMI Controller CSC.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/gpu/drm/meson/meson_dw_hdmi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index 0b9ecbfe65b4..6df124c1bba5 100644
--- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
@@ -670,7 +670,10 @@ static int meson_venc_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
 		dw_hdmi->output_bus_format = MEDIA_BUS_FMT_UYYVYY8_0_5X24;
 	} else {
 		dw_hdmi->input_bus_format = MEDIA_BUS_FMT_YUV8_1X24;
-		dw_hdmi->output_bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+		if (info->color_formats & DRM_COLOR_FORMAT_YCRCB444)
+			dw_hdmi->output_bus_format = MEDIA_BUS_FMT_YUV8_1X24;
+		else
+			dw_hdmi->output_bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 	}
 
 	return 0;
-- 
2.19.1