drm/i915: Add hot_plug hook for hdmi encoder

This patch adds a separate probe function for HDMI
EDID read over DDC channel. This function has been
registered as a .hot_plug handler for HDMI encoder.

The current implementation of hdmi_detect()
function re-sets the cached HDMI edid (in connector->detect_edid) in
every detect call.This function gets called many times, sometimes
directly from userspace probes, forcing drivers to read EDID every
detect function call.This causes several problems like:

1. Race conditions in multiple hot_plug / unplug cases, between
   interrupts bottom halves and userspace detections.
2. Many Un-necessary EDID reads for single hotplug/unplug
3. HDMI complaince failures which expects only one EDID read per hotplug

This function will be serving the purpose of really reading the EDID
by really probing the DDC channel, and updating the cached EDID.

The plan is to:
1. i915 IRQ handler bottom half function already calls
   intel_encoder->hotplug() function. Adding This probe function which
   will read the EDID only in case of a hotplug / unplug.
2. During init_connector this probe will be called to read the edid
3. Reuse the cached EDID in hdmi_detect() function.

The "< gen7" check is there because this was tested only for >=gen7
platforms. For older platforms the hotplug/reading edid path remains same.

v2: Calling set_edid instead of hdmi_probe during init.
Also, for platforms having DDI, intel_encoder for DP and HDMI is same
(taken from intel_dig_port), so for DP also, hot_plug function gets called
which is not intended here. So, check for HDMI in intel_hdmi_probe
Rely on HPD for updating edid only for platforms gen > 8 and also for VLV.

v3: Dropping the gen < 8 || !VLV  check. Now all platforms should rely on
hotplug or init for updating the edid.(Daniel)
Also, calling hdmi_probe in init instead of set_edid

v4: Renaming intel_hdmi_probe to intel_hdmi_hot_plug.
Also calling this hotplug handler from intel_hpd_init to take care of init
resume scenarios.

v5: Moved the call to encoder hotplug during init to separate patch(Daniel)
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
[danvet: Mark intel_hdmi_hot_plug as static.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_hdmi.c

@@ -1369,18 +1369,16 @@ intel_hdmi_set_edid(struct drm_connector *connector, bool force)
 	return connected;
 }
 
-static enum drm_connector_status
-intel_hdmi_detect(struct drm_connector *connector, bool force)
+static void intel_hdmi_hot_plug(struct intel_encoder *intel_encoder)
 {
-	enum drm_connector_status status;
-	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
-	struct drm_i915_private *dev_priv = to_i915(connector->dev);
+	struct intel_hdmi *intel_hdmi =
+			enc_to_intel_hdmi(&intel_encoder->base);
+	struct intel_connector *intel_connector =
+				intel_hdmi->attached_connector;
+	struct drm_i915_private *dev_priv = to_i915(intel_encoder->base.dev);
 	bool live_status = false;
 	unsigned int retry = 3;
 
-	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
-		      connector->base.id, connector->name);
-
 	while (!live_status && --retry) {
 		live_status = intel_digital_port_connected(dev_priv,
 				hdmi_to_dig_port(intel_hdmi));
@@ -1390,15 +1388,48 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
 	if (!live_status)
 		DRM_DEBUG_KMS("Live status not up!");
 
-	intel_hdmi_unset_edid(connector);
+	/*
+	 * We are here, means there is a hotplug or a force
+	 * detection. Clear the cached EDID and probe the
+	 * DDC bus to check the current status of HDMI.
+	 */
+	intel_hdmi_unset_edid(&intel_connector->base);
+	if (intel_hdmi_set_edid(&intel_connector->base, live_status))
+		DRM_DEBUG_DRIVER("DDC probe: got EDID\n");
+	else
+		DRM_DEBUG_DRIVER("DDC probe: no EDID\n");
+}
 
-	if (intel_hdmi_set_edid(connector, live_status)) {
+static enum drm_connector_status
+intel_hdmi_detect(struct drm_connector *connector, bool force)
+{
+	enum drm_connector_status status;
+	struct intel_connector *intel_connector =
+				to_intel_connector(connector);
+
+	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
+		      connector->base.id, connector->name);
+
+	/*
+	 * There are many userspace calls which probe EDID from
+	 * detect path. In case of multiple hotplug/unplug, these
+	 * can cause race conditions while probing EDID. Also its
+	 * waste of CPU cycles to read the EDID again and again
+	 * unless there is a real hotplug.
+	 * So, rely on hotplugs and init to read edid.
+	 * Check connector status based on availability of cached EDID.
+	 */
+
+	if (intel_connector->detect_edid) {
 		struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
 
 		hdmi_to_dig_port(intel_hdmi)->base.type = INTEL_OUTPUT_HDMI;
 		status = connector_status_connected;
-	} else
+		DRM_DEBUG_DRIVER("hdmi status = connected\n");
+	} else {
 		status = connector_status_disconnected;
+		DRM_DEBUG_DRIVER("hdmi status = disconnected\n");
+	}
 
 	return status;
 }
@@ -2114,6 +2145,7 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
 	intel_connector->unregister = intel_connector_unregister;
 
 	intel_hdmi_add_properties(intel_hdmi, connector);
+	intel_encoder->hot_plug = intel_hdmi_hot_plug;
 
 	intel_connector_attach_encoder(intel_connector, intel_encoder);
 	drm_connector_register(connector);