[v4 3/3] drm/i915: Attach colorspace property and enable modeset

[Uma Shankar]

This patch attaches the colorspace connector property to the
hdmi connector. Based on colorspace change, modeset will be
triggered to switch to new colorspace.

Based on colorspace property value create an infoframe
with appropriate colorspace. This can be used to send an
infoframe packet with proper colorspace value set which
will help to enable wider color gamut like BT2020 on sink.

This patch attaches and enables HDMI colorspace, DP will be
taken care separately.

v2: Merged the changes of creating infoframe as well to this
patch as per Maarten's suggestion.

v3: Addressed review comments from Shashank. Separated HDMI
and DP colorspaces as suggested by Ville and Maarten.

v4: Addressed Chris and Ville's review comments, and created a
common colorspace property for DP and HDMI, filtered the list
based on the colorspaces supported by the respective protocol
standard. Handle the default case properly.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/intel_atomic.c    |  1 +
 drivers/gpu/drm/i915/intel_connector.c |  8 ++++++++
 drivers/gpu/drm/i915/intel_drv.h       |  1 +
 drivers/gpu/drm/i915/intel_hdmi.c      | 18 ++++++++++++++++++
 4 files changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
index a5a2c8f..35ef70a 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -125,6 +125,7 @@ int intel_digital_connector_atomic_check(struct drm_connector *conn,
 	 */
 	if (new_conn_state->force_audio != old_conn_state->force_audio ||
 	    new_conn_state->broadcast_rgb != old_conn_state->broadcast_rgb ||
+	    new_state->colorspace != old_state->colorspace ||
 	    new_conn_state->base.picture_aspect_ratio != old_conn_state->base.picture_aspect_ratio ||
 	    new_conn_state->base.content_type != old_conn_state->base.content_type ||
 	    new_conn_state->base.scaling_mode != old_conn_state->base.scaling_mode)
diff --git a/drivers/gpu/drm/i915/intel_connector.c b/drivers/gpu/drm/i915/intel_connector.c
index 18e370f..65e9152 100644
--- a/drivers/gpu/drm/i915/intel_connector.c
+++ b/drivers/gpu/drm/i915/intel_connector.c
@@ -262,3 +262,11 @@ int intel_ddc_get_modes(struct drm_connector *connector,
 			connector->dev->mode_config.aspect_ratio_property,
 			DRM_MODE_PICTURE_ASPECT_NONE);
 }
+
+void
+intel_attach_colorspace_property(struct drm_connector *connector)
+{
+	if (!drm_mode_create_colorspace_property(connector))
+		drm_object_attach_property(&connector->base,
+		connector->colorspace_property, 0);
+}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a62d77b..891bc82 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1762,6 +1762,7 @@ int intel_connector_update_modes(struct drm_connector *connector,
 void intel_attach_force_audio_property(struct drm_connector *connector);
 void intel_attach_broadcast_rgb_property(struct drm_connector *connector);
 void intel_attach_aspect_ratio_property(struct drm_connector *connector);
+void intel_attach_colorspace_property(struct drm_connector *connector);
 
 /* intel_csr.c */
 void intel_csr_ucode_init(struct drm_i915_private *);
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index e2c6a2b..7ddc723 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -486,6 +486,22 @@ static void intel_hdmi_set_avi_infoframe(struct intel_encoder *encoder,
 	else
 		frame.avi.colorspace = HDMI_COLORSPACE_RGB;
 
+	if (conn_state->colorspace == COLORIMETRY_DEFAULT) {
+		/* Set ITU 709 as default for HDMI */
+		frame.avi.colorimetry = COLORIMETRY_ITU_709;
+	} else if (conn_state->colorspace < COLORIMETRY_XV_YCC_601) {
+		frame.avi.colorimetry = conn_state->colorspace;
+	} else {
+		frame.avi.colorimetry = HDMI_COLORIMETRY_EXTENDED;
+		/*
+		 * Starting from extended list where COLORIMETRY_XV_YCC_601
+		 * is the first extended mode and its value is 0 as per HDMI
+		 * specification.
+		 */
+		frame.avi.extended_colorimetry = conn_state->colorspace -
+							COLORIMETRY_XV_YCC_601;
+	}
+
 	drm_hdmi_avi_infoframe_quant_range(&frame.avi, adjusted_mode,
 					   crtc_state->limited_color_range ?
 					   HDMI_QUANTIZATION_RANGE_LIMITED :
@@ -2135,6 +2151,8 @@ static void intel_hdmi_destroy(struct drm_connector *connector)
 	intel_attach_force_audio_property(connector);
 	intel_attach_broadcast_rgb_property(connector);
 	intel_attach_aspect_ratio_property(connector);
+	intel_attach_colorspace_property(connector);
+
 	drm_connector_attach_content_type_property(connector);
 	connector->state->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
 
-- 
1.9.1