drm/i915: add DisplayPort CEC-Tunneling-over-AUX support

Implement support for this DisplayPort feature.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180711132909.25409-4-hverkuil@xs4all.nl

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 6ac6c8787dcf658fd44ec98b7b95f89afa09d1a0..b021801dbd48a799c4788c20ee83cb280489b9df 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4495,6 +4495,9 @@ intel_dp_short_pulse(struct intel_dp *intel_dp)
                        DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n");
        }
 
+       /* Handle CEC interrupts, if any */
+       drm_dp_cec_irq(&intel_dp->aux);
+
        /* defer to the hotplug work for link retraining if needed */
        if (intel_dp_needs_link_retrain(intel_dp))
                return false;
@@ -4809,6 +4812,7 @@ intel_dp_set_edid(struct intel_dp *intel_dp)
        intel_connector->detect_edid = edid;
 
        intel_dp->has_audio = drm_detect_monitor_audio(edid);
+       drm_dp_cec_set_edid(&intel_dp->aux, edid);
 }
 
 static void
@@ -4816,6 +4820,7 @@ intel_dp_unset_edid(struct intel_dp *intel_dp)
 {
        struct intel_connector *intel_connector = intel_dp->attached_connector;
 
+       drm_dp_cec_unset_edid(&intel_dp->aux);
        kfree(intel_connector->detect_edid);
        intel_connector->detect_edid = NULL;
 
@@ -5004,6 +5009,7 @@ static int
 intel_dp_connector_register(struct drm_connector *connector)
 {
        struct intel_dp *intel_dp = intel_attached_dp(connector);
+       struct drm_device *dev = connector->dev;
        int ret;
 
        ret = intel_connector_register(connector);
@@ -5016,13 +5022,20 @@ intel_dp_connector_register(struct drm_connector *connector)
                      intel_dp->aux.name, connector->kdev->kobj.name);
 
        intel_dp->aux.dev = connector->kdev;
-       return drm_dp_aux_register(&intel_dp->aux);
+       ret = drm_dp_aux_register(&intel_dp->aux);
+       if (!ret)
+               drm_dp_cec_register_connector(&intel_dp->aux,
+                                             connector->name, dev->dev);
+       return ret;
 }
 
 static void
 intel_dp_connector_unregister(struct drm_connector *connector)
 {
-       drm_dp_aux_unregister(&intel_attached_dp(connector)->aux);
+       struct intel_dp *intel_dp = intel_attached_dp(connector);
+
+       drm_dp_cec_unregister_connector(&intel_dp->aux);
+       drm_dp_aux_unregister(&intel_dp->aux);
        intel_connector_unregister(connector);
 }