[PATCH v5 14/15] drm/rockchip: dw_hdmi_qp: Enable YUV420 output format

[Cristian Ciocaltea]

Both RK3576 and RK3588 SoCs are capable of driving the YUV420 output
color format, and the required bus-format handling and VOP2 support are
already in place.  Advertise it via the platform supported formats so
the HDMI core can select it.

YUV420 halves the TMDS bandwidth compared to RGB/YUV444, which enables
high-resolution modes such as 4K at 60Hz on links that cannot otherwise
carry the full-bandwidth signal.

Tested-by: Igor Paunovic <royalnet026 at gmail.com>
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea at collabora.com>
---
 drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
index 380dd9ca6870..7314ccc975ca 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
@@ -648,7 +648,8 @@ static int dw_hdmi_qp_rockchip_bind(struct device *dev, struct device *master,
 
 	plat_data.supported_formats = BIT(DRM_OUTPUT_COLOR_FORMAT_RGB444) |
 				      BIT(DRM_OUTPUT_COLOR_FORMAT_YCBCR444) |
-				      BIT(DRM_OUTPUT_COLOR_FORMAT_YCBCR422);
+				      BIT(DRM_OUTPUT_COLOR_FORMAT_YCBCR422) |
+				      BIT(DRM_OUTPUT_COLOR_FORMAT_YCBCR420);
 
 	encoder = &hdmi->encoder.encoder;
 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);

-- 
2.55.0