[PATCH 3/7] drm/amd/display: Add handling for new "active color format" property

[Andri Yngvason]

From: Werner Sembach <wse at tuxedocomputers.com>

This commit implements the "active color format" drm property for the AMD
GPU driver.

Signed-off-by: Werner Sembach <wse at tuxedocomputers.com>
Signed-off-by: Andri Yngvason <andri at yngvason.is>
Tested-by: Andri Yngvason <andri at yngvason.is>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 42 ++++++++++++++++++-
 .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  4 ++
 2 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 10e041a3b2545..b44d06c3b1706 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -6882,6 +6882,24 @@ int convert_dc_color_depth_into_bpc(enum dc_color_depth display_color_depth)
 	return 0;
 }
 
+static int convert_dc_pixel_encoding_into_drm_color_format(
+	enum dc_pixel_encoding display_pixel_encoding)
+{
+	switch (display_pixel_encoding) {
+	case PIXEL_ENCODING_RGB:
+		return DRM_COLOR_FORMAT_RGB444;
+	case PIXEL_ENCODING_YCBCR422:
+		return DRM_COLOR_FORMAT_YCBCR422;
+	case PIXEL_ENCODING_YCBCR444:
+		return DRM_COLOR_FORMAT_YCBCR444;
+	case PIXEL_ENCODING_YCBCR420:
+		return DRM_COLOR_FORMAT_YCBCR420;
+	default:
+		break;
+	}
+	return 0;
+}
+
 static int dm_encoder_helper_atomic_check(struct drm_encoder *encoder,
 					  struct drm_crtc_state *crtc_state,
 					  struct drm_connector_state *conn_state)
@@ -7436,8 +7454,10 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
 				adev->mode_info.underscan_vborder_property,
 				0);
 
-	if (!aconnector->mst_root)
+	if (!aconnector->mst_root) {
 		drm_connector_attach_max_bpc_property(&aconnector->base, 8, 16);
+		drm_connector_attach_active_color_format_property(&aconnector->base);
+	}
 
 	aconnector->base.state->max_bpc = 16;
 	aconnector->base.state->max_requested_bpc = aconnector->base.state->max_bpc;
@@ -8969,6 +8989,26 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 		kfree(dummy_updates);
 	}
 
+	/* Extract information from crtc to communicate it to userspace as connector properties */
+	for_each_new_connector_in_state(state, connector, new_con_state, i) {
+		struct drm_crtc *crtc = new_con_state->crtc;
+		struct dc_stream_state *stream;
+
+		if (crtc) {
+			new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+			dm_new_crtc_state = to_dm_crtc_state(new_crtc_state);
+			stream = dm_new_crtc_state->stream;
+
+			if (stream) {
+				drm_connector_set_active_color_format_property(connector,
+					convert_dc_pixel_encoding_into_drm_color_format(
+						dm_new_crtc_state->stream->timing.pixel_encoding));
+			}
+		} else {
+			drm_connector_set_active_color_format_property(connector, 0);
+		}
+	}
+
 	/**
 	 * Enable interrupts for CRTCs that are newly enabled or went through
 	 * a modeset. It was intentionally deferred until after the front end
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 11da0eebee6c4..a4d1b3ea8f81c 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -600,6 +600,10 @@ dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 	if (connector->max_bpc_property)
 		drm_connector_attach_max_bpc_property(connector, 8, 16);
 
+	connector->active_color_format_property = master->base.active_color_format_property;
+	if (connector->active_color_format_property)
+		drm_connector_attach_active_color_format_property(&aconnector->base);
+
 	connector->vrr_capable_property = master->base.vrr_capable_property;
 	if (connector->vrr_capable_property)
 		drm_connector_attach_vrr_capable_property(connector);
-- 
2.43.0