drm/vc4: Add HDR metadata property to the VC5 HDMI connectors

Now that we can export deeper colour depths, add in the signalling
for HDR metadata.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210430094451.2145002-3-maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_hdmi.c

@@ -214,6 +214,31 @@ static int vc4_hdmi_connector_get_modes(struct drm_connector *connector)
 	return ret;
 }
 
+static int vc4_hdmi_connector_atomic_check(struct drm_connector *connector,
+					   struct drm_atomic_state *state)
+{
+	struct drm_connector_state *old_state =
+		drm_atomic_get_old_connector_state(state, connector);
+	struct drm_connector_state *new_state =
+		drm_atomic_get_new_connector_state(state, connector);
+	struct drm_crtc *crtc = new_state->crtc;
+
+	if (!crtc)
+		return 0;
+
+	if (!drm_connector_atomic_hdr_metadata_equal(old_state, new_state)) {
+		struct drm_crtc_state *crtc_state;
+
+		crtc_state = drm_atomic_get_crtc_state(state, crtc);
+		if (IS_ERR(crtc_state))
+			return PTR_ERR(crtc_state);
+
+		crtc_state->mode_changed = true;
+	}
+
+	return 0;
+}
+
 static void vc4_hdmi_connector_reset(struct drm_connector *connector)
 {
 	struct vc4_hdmi_connector_state *old_state =
@@ -263,6 +288,7 @@ static const struct drm_connector_funcs vc4_hdmi_connector_funcs = {
 
 static const struct drm_connector_helper_funcs vc4_hdmi_connector_helper_funcs = {
 	.get_modes = vc4_hdmi_connector_get_modes,
+	.atomic_check = vc4_hdmi_connector_atomic_check,
 };
 
 static int vc4_hdmi_connector_init(struct drm_device *dev,
@@ -299,6 +325,9 @@ static int vc4_hdmi_connector_init(struct drm_device *dev,
 	connector->interlace_allowed = 1;
 	connector->doublescan_allowed = 0;
 
+	if (vc4_hdmi->variant->supports_hdr)
+		drm_connector_attach_hdr_output_metadata_property(connector);
+
 	drm_connector_attach_encoder(connector, encoder);
 
 	return 0;
@@ -432,6 +461,25 @@ static void vc4_hdmi_set_audio_infoframe(struct drm_encoder *encoder)
 	vc4_hdmi_write_infoframe(encoder, &frame);
 }
 
+static void vc4_hdmi_set_hdr_infoframe(struct drm_encoder *encoder)
+{
+	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
+	struct drm_connector *connector = &vc4_hdmi->connector;
+	struct drm_connector_state *conn_state = connector->state;
+	union hdmi_infoframe frame;
+
+	if (!vc4_hdmi->variant->supports_hdr)
+		return;
+
+	if (!conn_state->hdr_output_metadata)
+		return;
+
+	if (drm_hdmi_infoframe_set_hdr_metadata(&frame.drm, conn_state))
+		return;
+
+	vc4_hdmi_write_infoframe(encoder, &frame);
+}
+
 static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder)
 {
 	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
@@ -444,6 +492,8 @@ static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder)
 	 */
 	if (vc4_hdmi->audio.streaming)
 		vc4_hdmi_set_audio_infoframe(encoder);
+
+	vc4_hdmi_set_hdr_infoframe(encoder);
 }
 
 static void vc4_hdmi_encoder_post_crtc_disable(struct drm_encoder *encoder,
@@ -2102,6 +2152,7 @@ static const struct vc4_hdmi_variant bcm2835_variant = {
 	.phy_rng_enable		= vc4_hdmi_phy_rng_enable,
 	.phy_rng_disable	= vc4_hdmi_phy_rng_disable,
 	.channel_map		= vc4_hdmi_channel_map,
+	.supports_hdr		= false,
 };
 
 static const struct vc4_hdmi_variant bcm2711_hdmi0_variant = {
@@ -2129,6 +2180,7 @@ static const struct vc4_hdmi_variant bcm2711_hdmi0_variant = {
 	.phy_rng_enable		= vc5_hdmi_phy_rng_enable,
 	.phy_rng_disable	= vc5_hdmi_phy_rng_disable,
 	.channel_map		= vc5_hdmi_channel_map,
+	.supports_hdr		= true,
 };
 
 static const struct vc4_hdmi_variant bcm2711_hdmi1_variant = {
@@ -2156,6 +2208,7 @@ static const struct vc4_hdmi_variant bcm2711_hdmi1_variant = {
 	.phy_rng_enable		= vc5_hdmi_phy_rng_enable,
 	.phy_rng_disable	= vc5_hdmi_phy_rng_disable,
 	.channel_map		= vc5_hdmi_channel_map,
+	.supports_hdr		= true,
 };
 
 static const struct of_device_id vc4_hdmi_dt_match[] = {

drivers/gpu/drm/vc4/vc4_hdmi.h

@@ -99,6 +99,9 @@ struct vc4_hdmi_variant {
 
 	/* Callback to get channel map */
 	u32 (*channel_map)(struct vc4_hdmi *vc4_hdmi, u32 channel_mask);
+
+	/* Enables HDR metadata */
+	bool supports_hdr;
 };
 
 /* HDMI audio information */