950-0475-drm-vc4-Add-HDR-metadata-property-to-the-VC5-HDMI-co.patch

From 82a5aa1df1b04efef46c7be82a7d71ea5300ce92 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Wed, 2 Dec 2020 18:36:24 +0000
Subject: [PATCH] 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>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 28 ++++++++++++++++++++++++++++
 drivers/gpu/drm/vc4/vc4_hdmi.h |  3 +++
 2 files changed, 31 insertions(+)

--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -310,6 +310,10 @@ static int vc4_hdmi_connector_init(struc
 	connector->doublescan_allowed = 0;
 	connector->stereo_allowed = 1;
 
+	if (vc4_hdmi->variant->supports_hdr)
+		drm_object_attach_property(&connector->base,
+			connector->dev->mode_config.hdr_output_metadata_property, 0);
+
 	drm_connector_attach_encoder(connector, encoder);
 
 	return 0;
@@ -449,6 +453,25 @@ static void vc4_hdmi_set_audio_infoframe
 	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);
@@ -461,6 +484,8 @@ static void vc4_hdmi_set_infoframes(stru
 	 */
 	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,
@@ -2296,6 +2321,7 @@ static const struct vc4_hdmi_variant bcm
 	.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 = {
@@ -2323,6 +2349,7 @@ static const struct vc4_hdmi_variant bcm
 	.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 = {
@@ -2350,6 +2377,7 @@ static const struct vc4_hdmi_variant bcm
 	.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[] = {
--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
+++ b/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 */