linux-kernel - [PATCH v3 1/2] drm_bridge: register content protect property

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Message-Id: <20221102111148.1810314-1-hsinyi@chromium.org>
Date:   Wed,  2 Nov 2022 19:11:46 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Sean Paul <seanpaul@...omium.org>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/2] drm_bridge: register content protect property

Some bridges are able to update HDCP status from userspace request if
they support HDCP.

HDCP property is the same as other connector properties that needs to be
created after the connecter is initialized and before the connector is
registered.

If there exists a bridge that supports HDCP, add the property to the
bridge connector.

Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
---
v2->v3:
Only register the property when there exists any bridge that supports
hdcp.
---
 drivers/gpu/drm/drm_bridge_connector.c | 8 ++++++++
 include/drm/drm_bridge.h               | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/drm_bridge_connector.c b/drivers/gpu/drm/drm_bridge_connector.c
index 1c7d936523df5..b4fb5da0b963f 100644
--- a/drivers/gpu/drm/drm_bridge_connector.c
+++ b/drivers/gpu/drm/drm_bridge_connector.c
@@ -7,6 +7,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 
+#include <drm/display/drm_hdcp_helper.h>
 #include <drm/drm_atomic_state_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_bridge_connector.h>
@@ -333,6 +334,7 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 	struct i2c_adapter *ddc = NULL;
 	struct drm_bridge *bridge, *panel_bridge = NULL;
 	int connector_type;
+	bool support_hdcp = false;
 
 	bridge_connector = kzalloc(sizeof(*bridge_connector), GFP_KERNEL);
 	if (!bridge_connector)
@@ -376,6 +378,9 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 
 		if (drm_bridge_is_panel(bridge))
 			panel_bridge = bridge;
+
+		if (bridge->support_hdcp)
+			support_hdcp = true;
 	}
 
 	if (connector_type == DRM_MODE_CONNECTOR_Unknown) {
@@ -398,6 +403,9 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 	if (panel_bridge)
 		drm_panel_bridge_set_orientation(connector, panel_bridge);
 
+	if (support_hdcp && IS_ENABLED(CONFIG_DRM_DISPLAY_HDCP_HELPER))
+		drm_connector_attach_content_protection_property(connector, true);
+
 	return connector;
 }
 EXPORT_SYMBOL_GPL(drm_bridge_connector_init);
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 6b65b0dfb4fb4..1d2ab70f3436a 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -768,6 +768,10 @@ struct drm_bridge {
 	 * modes.
 	 */
 	bool interlace_allowed;
+	/**
+	 * @support_hdcp: Indicate that the bridge supports HDCP.
+	 */
+	bool support_hdcp;
 	/**
 	 * @ddc: Associated I2C adapter for DDC access, if any.
 	 */
-- 
2.38.0.135.g90850a2211-goog