[PATCH RFC v3 05/37] drm/connector: hdmi: Add output BPC to the connector state

[Maxime Ripard]

We'll add automatic selection of the output BPC in a following patch,
but let's add it to the HDMI connector state already.

Signed-off-by: Maxime Ripard <mripard at kernel.org>
---
 drivers/gpu/drm/drm_atomic.c              |  1 +
 drivers/gpu/drm/drm_atomic_state_helper.c |  8 +++++++-
 drivers/gpu/drm/drm_connector.c           | 20 +++++++++++++++++++-
 include/drm/drm_connector.h               | 13 ++++++++++++-
 4 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 55cb117cd49a..51aac1b2aaaf 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1147,6 +1147,7 @@ static void drm_atomic_connector_print_state(struct drm_printer *p,
 		drm_printf(p, "\tbroadcast_rgb=%s\n",
 			   drm_hdmi_connector_get_broadcast_rgb_name(state->hdmi.broadcast_rgb));
 		drm_printf(p, "\tis_full_range=%c\n", state->hdmi.is_full_range ? 'y' : 'n');
+		drm_printf(p, "\toutput_bpc=%u\n", state->hdmi.output_bpc);
 	}
 
 	if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index c3f124af64dc..406ba358aa14 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -570,6 +570,11 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);
 void __drm_atomic_helper_connector_hdmi_reset(struct drm_connector *connector,
 					      struct drm_connector_state *new_state)
 {
+	unsigned int max_bpc = connector->max_bpc;
+
+	new_state->max_bpc = max_bpc;
+	new_state->max_requested_bpc = max_bpc;
+	new_state->hdmi.output_bpc = max_bpc;
 	new_state->hdmi.broadcast_rgb = DRM_HDMI_BROADCAST_RGB_AUTO;
 }
 EXPORT_SYMBOL(__drm_atomic_helper_connector_hdmi_reset);
@@ -686,7 +691,8 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
 
 	new_state->hdmi.is_full_range = hdmi_is_full_range(connector, new_state);
 
-	if (old_state->hdmi.broadcast_rgb != new_state->hdmi.broadcast_rgb) {
+	if (old_state->hdmi.broadcast_rgb != new_state->hdmi.broadcast_rgb ||
+	    old_state->hdmi.output_bpc != new_state->hdmi.output_bpc) {
 		struct drm_crtc *crtc = new_state->crtc;
 		struct drm_crtc_state *crtc_state;
 
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 36d728e811ae..508d1c667732 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -459,6 +459,7 @@ EXPORT_SYMBOL(drmm_connector_init);
  * @funcs: callbacks for this connector
  * @connector_type: user visible type of the connector
  * @ddc: optional pointer to the associated ddc adapter
+ * @max_bpc: Maximum bits per char the HDMI connector supports
  *
  * Initialises a preallocated HDMI connector. Connectors can be
  * subclassed as part of driver connector objects.
@@ -475,7 +476,8 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
 			     struct drm_connector *connector,
 			     const struct drm_connector_funcs *funcs,
 			     int connector_type,
-			     struct i2c_adapter *ddc)
+			     struct i2c_adapter *ddc,
+			     unsigned int max_bpc)
 {
 	int ret;
 
@@ -487,6 +489,22 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
 	if (ret)
 		return ret;
 
+	if (max_bpc) {
+		if (!(max_bpc == 8 || max_bpc == 10 || max_bpc == 12))
+			return -EINVAL;
+
+		/*
+		 * drm_connector_attach_max_bpc_property() requires the
+		 * connector to have a state.
+		 */
+		if (connector->funcs->reset)
+			connector->funcs->reset(connector);
+
+		drm_connector_attach_hdr_output_metadata_property(connector);
+		drm_connector_attach_max_bpc_property(connector, 8, max_bpc);
+		connector->max_bpc = max_bpc;
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL(drmm_connector_hdmi_init);
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index fc1fa754a40d..2d664b6ac0a6 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1059,6 +1059,11 @@ struct drm_connector_state {
 		 * RGB Quantization Range or not?
 		 */
 		bool is_full_range;
+
+		/**
+		 * @output_bpc: Bits per color channel to output.
+		 */
+		unsigned int output_bpc;
 	} hdmi;
 };
 
@@ -1703,6 +1708,11 @@ struct drm_connector {
 	 */
 	struct drm_property_blob *path_blob_ptr;
 
+	/**
+	 * @max_bpc: Maximum bits per color channel the connector supports.
+	 */
+	unsigned int max_bpc;
+
 	/**
 	 * @max_bpc_property: Default connector property for the max bpc to be
 	 * driven out of the connector.
@@ -1942,7 +1952,8 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
 			     struct drm_connector *connector,
 			     const struct drm_connector_funcs *funcs,
 			     int connector_type,
-			     struct i2c_adapter *ddc);
+			     struct i2c_adapter *ddc,
+			     unsigned int max_bpc);
 void drm_connector_attach_edid_property(struct drm_connector *connector);
 int drm_connector_register(struct drm_connector *connector);
 void drm_connector_unregister(struct drm_connector *connector);

-- 
2.41.0