linux-kernel - [PATCH RFC 04/13] drm/connector: hdmi: Add helper to get the RGB range

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Date:   Mon, 14 Aug 2023 15:56:16 +0200
From:   Maxime Ripard <mripard@...nel.org>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>
Cc:     Hans Verkuil <hverkuil@...all.nl>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Maxime Ripard <mripard@...nel.org>
Subject: [PATCH RFC 04/13] drm/connector: hdmi: Add helper to get the RGB
 range

HDMI controller drivers will need to figure out the RGB range they need
to configure based on a given atomic state.

Let's provide a helper to provide that information.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/drm_hdmi_connector.c | 41 ++++++++++++++++++++++++++++++++++++
 include/drm/drm_connector.h          |  4 ++++
 2 files changed, 45 insertions(+)

diff --git a/drivers/gpu/drm/drm_hdmi_connector.c b/drivers/gpu/drm/drm_hdmi_connector.c
index 2b6b9d444774..1fe3f3ebf719 100644
--- a/drivers/gpu/drm/drm_hdmi_connector.c
+++ b/drivers/gpu/drm/drm_hdmi_connector.c
@@ -4,6 +4,7 @@
 #include <drm/drm_atomic_state_helper.h>
 #include <drm/drm_connector.h>
 #include <drm/drm_crtc.h>
+#include <drm/drm_edid.h>
 #include <drm/drm_mode.h>
 #include <drm/drm_print.h>
 
@@ -217,6 +218,15 @@ int drm_atomic_helper_hdmi_connector_set_property(struct drm_connector *connecto
 }
 EXPORT_SYMBOL(drm_atomic_helper_hdmi_connector_set_property);
 
+static const struct drm_display_mode *
+connector_state_get_adjusted_mode(const struct drm_connector_state *state)
+{
+	struct drm_crtc *crtc = state->crtc;
+	struct drm_crtc_state *crtc_state = crtc->state;
+
+	return &crtc_state->adjusted_mode;
+}
+
 /**
  * drm_atomic_helper_hdmi_connector_atomic_check() - Helper to check HDMI connector atomic state
  * @connector: the parent connector this state refers to
@@ -259,6 +269,37 @@ int drm_atomic_helper_hdmi_connector_atomic_check(struct drm_connector *connecto
 }
 EXPORT_SYMBOL(drm_atomic_helper_hdmi_connector_atomic_check);
 
+/**
+ * drm_atomic_helper_hdmi_connector_is_full_range() - Checks whether a state uses Full-Range RGB
+ * @hdmi_connector: the HDMI connector this state refers to
+ * @hdmi_state: the HDMI connector state to check
+ *
+ * RETURNS:
+ * True if @hdmi_state requires a Full range RGB output, False otherwise
+ */
+bool
+drm_atomic_helper_hdmi_connector_is_full_range(const struct drm_hdmi_connector *hdmi_connector,
+					       const struct drm_hdmi_connector_state *hdmi_state)
+{
+	const struct drm_connector *connector = &hdmi_connector->base;
+	const struct drm_connector_state *conn_state = &hdmi_state->base;
+	const struct drm_display_mode *mode =
+		connector_state_get_adjusted_mode(conn_state);
+	const struct drm_display_info *display = &connector->display_info;
+
+	if (hdmi_state->broadcast_rgb == DRM_HDMI_BROADCAST_RGB_FULL)
+		return true;
+
+	if (hdmi_state->broadcast_rgb == DRM_HDMI_BROADCAST_RGB_LIMITED)
+		return false;
+
+	if (!display->is_hdmi)
+		return true;
+
+	return drm_default_rgb_quant_range(mode);
+}
+EXPORT_SYMBOL(drm_atomic_helper_hdmi_connector_is_full_range);
+
 static const struct drm_prop_enum_list broadcast_rgb_names[] = {
 	{ DRM_HDMI_BROADCAST_RGB_AUTO, "Automatic" },
 	{ DRM_HDMI_BROADCAST_RGB_FULL, "Full" },
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 24a0d33e5148..dff95e6e2b48 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -2111,6 +2111,10 @@ int drm_atomic_helper_hdmi_connector_atomic_check(struct drm_connector *connecto
 void drm_atomic_helper_hdmi_connector_print_state(struct drm_printer *p,
 						  const struct drm_connector_state *state);
 
+bool
+drm_atomic_helper_hdmi_connector_is_full_range(const struct drm_hdmi_connector *hdmi_connector,
+					       const struct drm_hdmi_connector_state *hdmi_state);
+
 struct drm_hdmi_connector {
 	/**
 	 * @base: Base Connector

-- 
2.41.0