3 files changed, 82 insertions, 1 deletions

diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
index 85953a0bc7c2..b9b0bb27069a 100644
--- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
+++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
@@ -25,6 +25,7 @@
 #include <video/videomode.h>
 #include <linux/platform_data/omapdss.h>
 #include <uapi/drm/drm_mode.h>
+#include <drm/drm_crtc.h>
 
 #define DISPC_IRQ_FRAMEDONE		(1 << 0)
 #define DISPC_IRQ_VSYNC			(1 << 1)
@@ -403,6 +404,14 @@ struct omapdss_hdmi_ops {
 	int (*read_edid)(struct omap_dss_device *dssdev, u8 *buf, int len);
 	bool (*detect)(struct omap_dss_device *dssdev);
 
+	int (*register_hpd_cb)(struct omap_dss_device *dssdev,
+			       void (*cb)(void *cb_data,
+					  enum drm_connector_status status),
+			       void *cb_data);
+	void (*unregister_hpd_cb)(struct omap_dss_device *dssdev);
+	void (*enable_hpd)(struct omap_dss_device *dssdev);
+	void (*disable_hpd)(struct omap_dss_device *dssdev);
+
 	int (*set_hdmi_mode)(struct omap_dss_device *dssdev, bool hdmi_mode);
 	int (*set_infoframe)(struct omap_dss_device *dssdev,
 		const struct hdmi_avi_infoframe *avi);
@@ -567,6 +576,14 @@ struct omap_dss_driver {
 	int (*read_edid)(struct omap_dss_device *dssdev, u8 *buf, int len);
 	bool (*detect)(struct omap_dss_device *dssdev);
 
+	int (*register_hpd_cb)(struct omap_dss_device *dssdev,
+			       void (*cb)(void *cb_data,
+					  enum drm_connector_status status),
+			       void *cb_data);
+	void (*unregister_hpd_cb)(struct omap_dss_device *dssdev);
+	void (*enable_hpd)(struct omap_dss_device *dssdev);
+	void (*disable_hpd)(struct omap_dss_device *dssdev);
+
 	int (*set_hdmi_mode)(struct omap_dss_device *dssdev, bool hdmi_mode);
 	int (*set_hdmi_infoframe)(struct omap_dss_device *dssdev,
 		const struct hdmi_avi_infoframe *avi);
diff --git a/drivers/gpu/drm/omapdrm/omap_connector.c b/drivers/gpu/drm/omapdrm/omap_connector.c
index d1ec76ef5cc6..aa5ba9ae2191 100644
--- a/drivers/gpu/drm/omapdrm/omap_connector.c
+++ b/drivers/gpu/drm/omapdrm/omap_connector.c
@@ -35,6 +35,23 @@ struct omap_connector {
 	bool hdmi_mode;
 };
 
+static void omap_connector_hpd_cb(void *cb_data,
+				  enum drm_connector_status status)
+{
+	struct omap_connector *omap_connector = cb_data;
+	struct drm_connector *connector = &omap_connector->base;
+	struct drm_device *dev = connector->dev;
+	enum drm_connector_status old_status;
+
+	mutex_lock(&dev->mode_config.mutex);
+	old_status = connector->status;
+	connector->status = status;
+	mutex_unlock(&dev->mode_config.mutex);
+
+	if (old_status != status)
+		drm_kms_helper_hotplug_event(dev);
+}
+
 bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
@@ -75,6 +92,10 @@ static void omap_connector_destroy(struct drm_connector *connector)
 	struct omap_dss_device *dssdev = omap_connector->dssdev;
 
 	DBG("%s", omap_connector->dssdev->name);
+	if (connector->polled == DRM_CONNECTOR_POLL_HPD &&
+	    dssdev->driver->unregister_hpd_cb) {
+		dssdev->driver->unregister_hpd_cb(dssdev);
+	}
 	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
 	kfree(omap_connector);
@@ -215,6 +236,7 @@ struct drm_connector *omap_connector_init(struct drm_device *dev,
 {
 	struct drm_connector *connector = NULL;
 	struct omap_connector *omap_connector;
+	bool hpd_supported = false;
 
 	DBG("%s", dssdev->name);
 
@@ -232,7 +254,20 @@ struct drm_connector *omap_connector_init(struct drm_device *dev,
 				connector_type);
 	drm_connector_helper_add(connector, &omap_connector_helper_funcs);
 
-	if (dssdev->driver->detect)
+	if (dssdev->driver->register_hpd_cb) {
+		int ret = dssdev->driver->register_hpd_cb(dssdev,
+							  omap_connector_hpd_cb,
+							  omap_connector);
+		if (!ret)
+			hpd_supported = true;
+		else if (ret != -ENOTSUPP)
+			DBG("%s: Failed to register HPD callback (%d).",
+			    dssdev->name, ret);
+	}
+
+	if (hpd_supported)
+		connector->polled = DRM_CONNECTOR_POLL_HPD;
+	else if (dssdev->driver->detect)
 		connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 				    DRM_CONNECTOR_POLL_DISCONNECT;
 	else
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index 721a358531b0..10e24ca928f2 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -324,6 +324,32 @@ static int omap_modeset_init(struct drm_device *dev)
 }
 
 /*
+ * Enable the HPD in external components if supported
+ */
+static void omap_modeset_enable_external_hpd(void)
+{
+	struct omap_dss_device *dssdev = NULL;
+
+	for_each_dss_dev(dssdev) {
+		if (dssdev->driver->enable_hpd)
+			dssdev->driver->enable_hpd(dssdev);
+	}
+}
+
+/*
+ * Disable the HPD in external components if supported
+ */
+static void omap_modeset_disable_external_hpd(void)
+{
+	struct omap_dss_device *dssdev = NULL;
+
+	for_each_dss_dev(dssdev) {
+		if (dssdev->driver->disable_hpd)
+			dssdev->driver->disable_hpd(dssdev);
+	}
+}
+
+/*
  * drm ioctl funcs
  */
 
@@ -602,6 +628,7 @@ static int pdev_probe(struct platform_device *pdev)
 	priv->fbdev = omap_fbdev_init(ddev);
 
 	drm_kms_helper_poll_init(ddev);
+	omap_modeset_enable_external_hpd();
 
 	/*
 	 * Register the DRM device with the core and the connectors with
@@ -614,6 +641,7 @@ static int pdev_probe(struct platform_device *pdev)
 	return 0;
 
 err_cleanup_helpers:
+	omap_modeset_disable_external_hpd();
 	drm_kms_helper_poll_fini(ddev);
 	if (priv->fbdev)
 		omap_fbdev_free(ddev);
@@ -642,6 +670,7 @@ static int pdev_remove(struct platform_device *pdev)
 
 	drm_dev_unregister(ddev);
 
+	omap_modeset_disable_external_hpd();
 	drm_kms_helper_poll_fini(ddev);
 
 	if (priv->fbdev)