linux-kernel - [PATCH RFC v2 04/37] drm/connector: hdmi: Add helper to get the RGB range

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Message-Id: <20230920-kms-hdmi-connector-state-v2-4-17932daddd7d@kernel.org>
Date:   Wed, 20 Sep 2023 16:35:19 +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>,
        Jonathan Corbet <corbet@....net>,
        Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>
Cc:     Hans Verkuil <hverkuil@...all.nl>, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        Maxime Ripard <mripard@...nel.org>
Subject: [PATCH RFC v2 04/37] 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_atomic_state_helper.c | 39 +++++++++++++++++++++++++++++++
 include/drm/drm_atomic_state_helper.h     |  5 ++++
 2 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index 4b24ebb7e3e8..0f7e5ba555b8 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -31,6 +31,7 @@
 #include <drm/drm_connector.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_device.h>
+#include <drm/drm_edid.h>
 #include <drm/drm_framebuffer.h>
 #include <drm/drm_plane.h>
 #include <drm/drm_print.h>
@@ -621,6 +622,15 @@ int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
 }
 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_check);
 
+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_connector_hdmi_check() - Helper to check HDMI connector atomic state
  * @connector: DRM Connector
@@ -656,6 +666,35 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
 }
 EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_check);
 
+/**
+ * drm_atomic_helper_connector_hdmi_is_full_range() - Checks whether a state uses Full-Range RGB
+ * @connector: the HDMI connector this state refers to
+ * @state: the HDMI connector state to check
+ *
+ * RETURNS:
+ * True if @state requires a Full range RGB output, False otherwise
+ */
+bool
+drm_atomic_helper_connector_hdmi_is_full_range(const struct drm_connector *connector,
+					       const struct drm_connector_state *state)
+{
+	const struct drm_display_mode *mode =
+		connector_state_get_adjusted_mode(state);
+	const struct drm_display_info *display = &connector->display_info;
+
+	if (state->hdmi.broadcast_rgb == DRM_HDMI_BROADCAST_RGB_FULL)
+		return true;
+
+	if (state->hdmi.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_connector_hdmi_is_full_range);
+
 /**
  * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
  * @connector: connector object
diff --git a/include/drm/drm_atomic_state_helper.h b/include/drm/drm_atomic_state_helper.h
index d59d2b3aef9a..c6d941b9e846 100644
--- a/include/drm/drm_atomic_state_helper.h
+++ b/include/drm/drm_atomic_state_helper.h
@@ -88,6 +88,11 @@ void
 __drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state);
 void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
 					  struct drm_connector_state *state);
+
+bool
+drm_atomic_helper_connector_hdmi_is_full_range(const struct drm_connector *connector,
+					       const struct drm_connector_state *state);
+
 void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj,
 						     struct drm_private_state *state);
 

-- 
2.41.0