[RFC v1 19/20] drm/hdcp2.2: HDCP2.2 enable as a asynchronous work

[Ramalingam C <ramalingam.c@intel.com>]

HDCP2 Authentication might take more then 5Secs based on the
downstream topology. So when atomic property set ioctl requests
for HDCP enable, We schedule the HDCP2 enbale as a asynchronous
work by not blocking the ioctl call.

The Result of the work will be updated to the DRM Property.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/gpu/drm/drm_hdcp.c | 40 +++++++++++++++++++++++++++++++++++++---
 include/drm/drm_hdcp.h     |  8 ++++++++
 2 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_hdcp.c b/drivers/gpu/drm/drm_hdcp.c
index cb20cc9..9e1b7ae 100644
--- a/drivers/gpu/drm/drm_hdcp.c
+++ b/drivers/gpu/drm/drm_hdcp.c
@@ -69,6 +69,39 @@ static void drm_hdcp_update_change(struct drm_hdcp *hdcp, bool enabled,
 	}
 }
 
+static void hdcp_2_2_enable_work(struct work_struct *work)
+{
+	struct drm_hdcp *hdcp = container_of(work, struct drm_hdcp,
+							hdcp2_enable_work);
+
+	mutex_lock(&hdcp->mutex);
+
+	/* Marking it as WIP */
+	drm_hdcp_update_change(hdcp, false, DRM_HDCP_WIP, true);
+	hdcp->spec_ver_used = HDCP_2_2_SUPPORT;
+
+	/*
+	 * TODO: Implement the HDCP2.2 authentication and Encryption Enable
+	 */
+	mutex_unlock(&hdcp->mutex);
+}
+
+static int drm_hdcp_2_2_enable(struct drm_hdcp *hdcp, uint8_t stream_type)
+{
+	mutex_lock(&hdcp->mutex);
+
+	/* Set the stream type */
+	hdcp->streams[0].stream_type = stream_type;
+
+	hdcp->req_state &= ~(DRM_HDCP_ENABLE | DRM_HDCP_TYPE_MASK);
+	hdcp->req_state = DRM_HDCP_ENABLE |
+				(stream_type << DRM_HDCP_TYPE_SHIFT);
+
+	schedule_work(&hdcp->hdcp2_enable_work);
+
+	mutex_unlock(&hdcp->mutex);
+	return 0;
+}
 
 int drm_hdcp_enable(struct drm_connector *connector, uint8_t stream_type)
 {
@@ -83,9 +116,8 @@ int drm_hdcp_enable(struct drm_connector *connector, uint8_t stream_type)
 		return ret;
 	}
 
-	/*
-	 * TODO: Invoke the Version specific hdcp_enable
-	 */
+	if (connector->hdcp_state & DRM_HDCP2_SUPPORTED)
+		return drm_hdcp_2_2_enable(hdcp, stream_type);
 
 	return 0;
 }
@@ -260,6 +292,8 @@ static inline int drm_hdcp2_init(struct drm_connector *connector,
 	/* Setting it to Type 0 by default */
 	hdcp->streams[0].stream_type = HDCP_STREAM_TYPE0_CODE;
 
+	INIT_WORK(&hdcp->hdcp2_enable_work, hdcp_2_2_enable_work);
+
 	return 0;
 }
 
diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h
index dac9831..ea18bac 100644
--- a/include/drm/drm_hdcp.h
+++ b/include/drm/drm_hdcp.h
@@ -366,6 +366,12 @@ struct drm_hdcp {
 	uint32_t ver_support_on_plat;
 	uint32_t ver_support_on_panel;
 
+	/*
+	 * HDCP ver last used for Enable. Will help to choose the
+	 * corresponding Version's disable.
+	 */
+	uint32_t spec_ver_used;
+
 	/* HDCP requested state and also the current state */
 	uint64_t req_state;
 
@@ -375,6 +381,8 @@ struct drm_hdcp {
 	const struct drm_hdcp_funcs *hdcp_funcs;
 	const struct drm_hdcp2_funcs *hdcp2_funcs;
 
+	struct work_struct hdcp2_enable_work;
+
 	struct mutex mutex;
 };
 
-- 
2.7.4

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