drm/i915: MEI interface implementation

Defining the mei-i915 interface functions and initialization of
the interface.

v2:
  Adjust to the new interface changes. [Tomas]
  Added further debug logs for the failures at MEI i/f.
  port in hdcp_port data is equipped to handle -ve values.
v3:
  mei comp is matched for global i915 comp master. [Daniel]
  In hdcp_shim hdcp_protocol() is replaced with const variable. [Daniel]
  mei wrappers are adjusted as per the i/f change [Daniel]
v4:
  port initialization is done only at hdcp2_init only [Danvet]
v5:
  I915 registers a subcomponent to be matched with mei_hdcp [Daniel]
v6:
  HDCP_disable for all connectors incase of comp_unbind.
  Tear down HDCP comp interface at i915_unload [Daniel]
v7:
  Component init and fini are moved out of connector ops [Daniel]
  hdcp_disable is not called from unbind. [Daniel]
v8:
  subcomponent name is dropped as it is already merged.
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> [v11]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550338640-17470-5-git-send-email-ramalingam.c@intel.com

drivers/gpu/drm/i915/i915_drv.c

@@ -906,6 +906,7 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv)
 	mutex_init(&dev_priv->av_mutex);
 	mutex_init(&dev_priv->wm.wm_mutex);
 	mutex_init(&dev_priv->pps_mutex);
+	mutex_init(&dev_priv->hdcp_comp_mutex);
 
 	i915_memcpy_init_early(dev_priv);
 	intel_runtime_pm_init_early(dev_priv);

drivers/gpu/drm/i915/i915_drv.h

@@ -55,6 +55,7 @@
 #include <drm/drm_util.h>
 #include <drm/drm_dsc.h>
 #include <drm/drm_connector.h>
+#include <drm/i915_mei_hdcp_interface.h>
 
 #include "i915_fixed.h"
 #include "i915_params.h"
@@ -2052,6 +2053,12 @@ struct drm_i915_private {
 
 	struct i915_pmu pmu;
 
+	struct i915_hdcp_comp_master *hdcp_master;
+	bool hdcp_comp_added;
+
+	/* Mutex to protect the above hdcp component related values. */
+	struct mutex hdcp_comp_mutex;
+
 	/*
 	 * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
 	 * will be rejected. Instead look for a better place.

drivers/gpu/drm/i915/intel_connector.c

@@ -88,6 +88,8 @@ void intel_connector_destroy(struct drm_connector *connector)
 
 	kfree(intel_connector->detect_edid);
 
+	intel_hdcp_cleanup(intel_connector);
+
 	if (!IS_ERR_OR_NULL(intel_connector->edid))
 		kfree(intel_connector->edid);
 

drivers/gpu/drm/i915/intel_display.c

@@ -15464,6 +15464,8 @@ int intel_modeset_init(struct drm_device *dev)
 	intel_update_czclk(dev_priv);
 	intel_modeset_init_hw(dev);
 
+	intel_hdcp_component_init(dev_priv);
+
 	if (dev_priv->max_cdclk_freq == 0)
 		intel_update_max_cdclk(dev_priv);
 
@@ -16325,6 +16327,8 @@ void intel_modeset_cleanup(struct drm_device *dev)
 	/* flush any delayed tasks or pending work */
 	flush_scheduled_work();
 
+	intel_hdcp_component_fini(dev_priv);
+
 	drm_mode_config_cleanup(dev);
 
 	intel_overlay_cleanup(dev_priv);

drivers/gpu/drm/i915/intel_drv.h

@@ -41,6 +41,7 @@
 #include <drm/drm_rect.h>
 #include <drm/drm_vblank.h>
 #include <drm/drm_atomic.h>
+#include <drm/i915_mei_hdcp_interface.h>
 #include <media/cec-notifier.h>
 
 struct drm_printer;
@@ -395,6 +396,9 @@ struct intel_hdcp_shim {
 	/* Detects panel's hdcp capability. This is optional for HDMI. */
 	int (*hdcp_capable)(struct intel_digital_port *intel_dig_port,
 			    bool *hdcp_capable);
+
+	/* HDCP adaptation(DP/HDMI) required on the port */
+	enum hdcp_wired_protocol protocol;
 };
 
 struct intel_hdcp {
@@ -415,6 +419,7 @@ struct intel_hdcp {
 	 * content can flow only through a link protected by HDCP2.2.
 	 */
 	u8 content_type;
+	struct hdcp_port_data port_data;
 };
 
 struct intel_connector {
@@ -2088,6 +2093,9 @@ int intel_hdcp_disable(struct intel_connector *connector);
 int intel_hdcp_check_link(struct intel_connector *connector);
 bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port);
 bool intel_hdcp_capable(struct intel_connector *connector);
+void intel_hdcp_component_init(struct drm_i915_private *dev_priv);
+void intel_hdcp_component_fini(struct drm_i915_private *dev_priv);
+void intel_hdcp_cleanup(struct intel_connector *connector);
 
 /* intel_psr.c */
 #define CAN_PSR(dev_priv) (HAS_PSR(dev_priv) && dev_priv->psr.sink_support)