[PATCH 07/31] drm/vc4: Limit max_bpc to 8 on Pi0-3

[Dave Stevenson]

Pi 0-3 have no deep colour support and only 24bpp output,
so max_bpc should remain as 8, and no HDR metadata property
should be registered.

Fixes: ba8c0faebbb0 ("drm/vc4: hdmi: Enable 10/12 bpc output")
Signed-off-by: Dave Stevenson <dave.stevenson at raspberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 04d32dc3e98c..afeeff660fa5 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -630,6 +630,11 @@ static int vc4_hdmi_connector_init(struct drm_device *dev,
 	if (ret)
 		return ret;
 
+	if (vc4_hdmi->variant->supports_hdr)
+		drm_connector_attach_max_bpc_property(connector, 8, 12);
+	else
+		drm_connector_attach_max_bpc_property(connector, 8, 8);
+
 	drm_connector_attach_encoder(connector, encoder);
 
 	return 0;
-- 
2.34.1