1 files changed, 308 insertions, 125 deletions

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 69b0b2b9cc1c..09b12c30df69 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -33,11 +33,11 @@
 #include <linux/moduleparam.h>
 
 #include <drm/drm_bridge.h>
-#include <drm/drm_client.h>
+#include <drm/drm_client_event.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_edid.h>
-#include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
+#include <drm/drm_managed.h>
 #include <drm/drm_modeset_helper_vtables.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
@@ -119,6 +119,7 @@ drm_mode_validate_pipeline(struct drm_display_mode *mode,
 		*status = drm_bridge_chain_mode_valid(bridge,
 						      &connector->display_info,
 						      mode);
+		drm_bridge_put(bridge);
 		if (*status != MODE_OK) {
 			/* There is also no point in continuing for crtc check
 			 * here. */
@@ -202,7 +203,7 @@ enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder,
 
 int
 drm_connector_mode_valid(struct drm_connector *connector,
-			 struct drm_display_mode *mode,
+			 const struct drm_display_mode *mode,
 			 struct drm_modeset_acquire_ctx *ctx,
 			 enum drm_mode_status *status)
 {
@@ -223,41 +224,51 @@ drm_connector_mode_valid(struct drm_connector *connector,
 	return ret;
 }
 
-#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
-/**
- * drm_kms_helper_poll_enable - re-enable output polling.
- * @dev: drm_device
- *
- * This function re-enables the output polling work, after it has been
- * temporarily disabled using drm_kms_helper_poll_disable(), for example over
- * suspend/resume.
- *
- * Drivers can call this helper from their device resume implementation. It is
- * not an error to call this even when output polling isn't enabled.
- *
- * Note that calls to enable and disable polling must be strictly ordered, which
- * is automatically the case when they're only call from suspend/resume
- * callbacks.
- */
-void drm_kms_helper_poll_enable(struct drm_device *dev)
+static void drm_kms_helper_disable_hpd(struct drm_device *dev)
 {
-	bool poll = false;
 	struct drm_connector *connector;
 	struct drm_connector_list_iter conn_iter;
-	unsigned long delay = DRM_OUTPUT_POLL_PERIOD;
 
-	if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
-		return;
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+		const struct drm_connector_helper_funcs *funcs =
+			connector->helper_private;
+
+		if (funcs && funcs->disable_hpd)
+			funcs->disable_hpd(connector);
+	}
+	drm_connector_list_iter_end(&conn_iter);
+}
+
+static bool drm_kms_helper_enable_hpd(struct drm_device *dev)
+{
+	bool poll = false;
+	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_iter;
 
 	drm_connector_list_iter_begin(dev, &conn_iter);
 	drm_for_each_connector_iter(connector, &conn_iter) {
+		const struct drm_connector_helper_funcs *funcs =
+			connector->helper_private;
+
+		if (funcs && funcs->enable_hpd)
+			funcs->enable_hpd(connector);
+
 		if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
 					 DRM_CONNECTOR_POLL_DISCONNECT))
 			poll = true;
 	}
 	drm_connector_list_iter_end(&conn_iter);
 
-	if (dev->mode_config.delayed_event) {
+	return poll;
+}
+
+#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
+static void reschedule_output_poll_work(struct drm_device *dev)
+{
+	unsigned long delay = DRM_OUTPUT_POLL_PERIOD;
+
+	if (dev->mode_config.delayed_event)
 		/*
 		 * FIXME:
 		 *
@@ -268,19 +279,83 @@ void drm_kms_helper_poll_enable(struct drm_device *dev)
 		 * drm_helper_probe_single_connector_modes() in case the poll
 		 * was enabled before.
 		 */
-		poll = true;
 		delay = HZ;
-	}
 
-	if (poll)
-		schedule_delayed_work(&dev->mode_config.output_poll_work, delay);
+	schedule_delayed_work(&dev->mode_config.output_poll_work, delay);
+}
+
+/**
+ * drm_kms_helper_poll_enable - re-enable output polling.
+ * @dev: drm_device
+ *
+ * This function re-enables the output polling work, after it has been
+ * temporarily disabled using drm_kms_helper_poll_disable(), for example over
+ * suspend/resume.
+ *
+ * Drivers can call this helper from their device resume implementation. It is
+ * not an error to call this even when output polling isn't enabled.
+ *
+ * If device polling was never initialized before, this call will trigger a
+ * warning and return.
+ *
+ * Note that calls to enable and disable polling must be strictly ordered, which
+ * is automatically the case when they're only call from suspend/resume
+ * callbacks.
+ */
+void drm_kms_helper_poll_enable(struct drm_device *dev)
+{
+	if (drm_WARN_ON_ONCE(dev, !dev->mode_config.poll_enabled) ||
+	    !drm_kms_helper_poll || dev->mode_config.poll_running)
+		return;
+
+	if (drm_kms_helper_enable_hpd(dev) ||
+	    dev->mode_config.delayed_event)
+		reschedule_output_poll_work(dev);
+
+	dev->mode_config.poll_running = true;
 }
 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
 
+/**
+ * drm_kms_helper_poll_reschedule - reschedule the output polling work
+ * @dev: drm_device
+ *
+ * This function reschedules the output polling work, after polling for a
+ * connector has been enabled.
+ *
+ * Drivers must call this helper after enabling polling for a connector by
+ * setting %DRM_CONNECTOR_POLL_CONNECT / %DRM_CONNECTOR_POLL_DISCONNECT flags
+ * in drm_connector::polled. Note that after disabling polling by clearing these
+ * flags for a connector will stop the output polling work automatically if
+ * the polling is disabled for all other connectors as well.
+ *
+ * The function can be called only after polling has been enabled by calling
+ * drm_kms_helper_poll_init() / drm_kms_helper_poll_enable().
+ */
+void drm_kms_helper_poll_reschedule(struct drm_device *dev)
+{
+	if (dev->mode_config.poll_running)
+		reschedule_output_poll_work(dev);
+}
+EXPORT_SYMBOL(drm_kms_helper_poll_reschedule);
+
+static int detect_connector_status(struct drm_connector *connector,
+				   struct drm_modeset_acquire_ctx *ctx,
+				   bool force)
+{
+	const struct drm_connector_helper_funcs *funcs = connector->helper_private;
+
+	if (funcs->detect_ctx)
+		return funcs->detect_ctx(connector, ctx, force);
+	else if (connector->funcs->detect)
+		return connector->funcs->detect(connector, force);
+
+	return connector_status_connected;
+}
+
 static enum drm_connector_status
 drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force)
 {
-	const struct drm_connector_helper_funcs *funcs = connector->helper_private;
 	struct drm_modeset_acquire_ctx ctx;
 	int ret;
 
@@ -288,14 +363,8 @@ drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force)
 
 retry:
 	ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx);
-	if (!ret) {
-		if (funcs->detect_ctx)
-			ret = funcs->detect_ctx(connector, &ctx, force);
-		else if (connector->funcs->detect)
-			ret = connector->funcs->detect(connector, force);
-		else
-			ret = connector_status_connected;
-	}
+	if (!ret)
+		ret = detect_connector_status(connector, &ctx, force);
 
 	if (ret == -EDEADLK) {
 		drm_modeset_backoff(&ctx);
@@ -329,7 +398,6 @@ drm_helper_probe_detect(struct drm_connector *connector,
 			struct drm_modeset_acquire_ctx *ctx,
 			bool force)
 {
-	const struct drm_connector_helper_funcs *funcs = connector->helper_private;
 	struct drm_device *dev = connector->dev;
 	int ret;
 
@@ -340,12 +408,7 @@ drm_helper_probe_detect(struct drm_connector *connector,
 	if (ret)
 		return ret;
 
-	if (funcs->detect_ctx)
-		ret = funcs->detect_ctx(connector, ctx, force);
-	else if (connector->funcs->detect)
-		ret = connector->funcs->detect(connector, force);
-	else
-		ret = connector_status_connected;
+	ret = detect_connector_status(connector, ctx, force);
 
 	if (ret != connector->status)
 		connector->epoch_counter += 1;
@@ -362,12 +425,19 @@ static int drm_helper_probe_get_modes(struct drm_connector *connector)
 
 	count = connector_funcs->get_modes(connector);
 
+	/* The .get_modes() callback should not return negative values. */
+	if (count < 0) {
+		drm_err(connector->dev, ".get_modes() returned %pe\n",
+			ERR_PTR(count));
+		count = 0;
+	}
+
 	/*
 	 * Fallback for when DDC probe failed in drm_get_edid() and thus skipped
 	 * override/firmware EDID.
 	 */
 	if (count == 0 && connector->status == connector_status_connected)
-		count = drm_add_override_edid_modes(connector);
+		count = drm_edid_override_connector_update(connector);
 
 	return count;
 }
@@ -406,6 +476,10 @@ static int __drm_helper_update_and_validate(struct drm_connector *connector,
 		if (mode->status != MODE_OK)
 			continue;
 
+		mode->status = drm_mode_validate_ycbcr420(mode, connector);
+		if (mode->status != MODE_OK)
+			continue;
+
 		ret = drm_mode_validate_pipeline(mode, connector, ctx,
 						 &mode->status);
 		if (ret) {
@@ -418,10 +492,6 @@ static int __drm_helper_update_and_validate(struct drm_connector *connector,
 			else
 				return -EDEADLK;
 		}
-
-		if (mode->status != MODE_OK)
-			continue;
-		mode->status = drm_mode_validate_ycbcr420(mode, connector);
 	}
 
 	return 0;
@@ -499,8 +569,8 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 
 	drm_modeset_acquire_init(&ctx, 0);
 
-	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
-			connector->name);
+	drm_dbg_kms(dev, "[CONNECTOR:%d:%s]\n", connector->base.id,
+		    connector->name);
 
 retry:
 	ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
@@ -543,11 +613,10 @@ retry:
 	 * check here, and if anything changed start the hotplug code.
 	 */
 	if (old_status != connector->status) {
-		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
-			      connector->base.id,
-			      connector->name,
-			      drm_get_connector_status_name(old_status),
-			      drm_get_connector_status_name(connector->status));
+		drm_dbg_kms(dev, "[CONNECTOR:%d:%s] status updated from %s to %s\n",
+			    connector->base.id, connector->name,
+			    drm_get_connector_status_name(old_status),
+			    drm_get_connector_status_name(connector->status));
 
 		/*
 		 * The hotplug event code might call into the fb
@@ -557,19 +626,21 @@ retry:
 		 */
 		dev->mode_config.delayed_event = true;
 		if (dev->mode_config.poll_enabled)
-			schedule_delayed_work(&dev->mode_config.output_poll_work,
-					      0);
+			mod_delayed_work(system_wq,
+					 &dev->mode_config.output_poll_work,
+					 0);
 	}
 
-	/* Re-enable polling in case the global poll config changed. */
-	if (drm_kms_helper_poll != dev->mode_config.poll_running)
+	/*
+	 * Re-enable polling in case the global poll config changed but polling
+	 * is still initialized.
+	 */
+	if (dev->mode_config.poll_enabled)
 		drm_kms_helper_poll_enable(dev);
 
-	dev->mode_config.poll_running = drm_kms_helper_poll;
-
 	if (connector->status == connector_status_disconnected) {
-		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
-			connector->base.id, connector->name);
+		drm_dbg_kms(dev, "[CONNECTOR:%d:%s] disconnected\n",
+			    connector->base.id, connector->name);
 		drm_connector_update_edid_property(connector, NULL);
 		drm_mode_prune_invalid(dev, &connector->modes, false);
 		goto exit;
@@ -627,11 +698,13 @@ exit:
 
 	drm_mode_sort(&connector->modes);
 
-	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
-			connector->name);
+	drm_dbg_kms(dev, "[CONNECTOR:%d:%s] probed modes:\n",
+		    connector->base.id, connector->name);
+
 	list_for_each_entry(mode, &connector->modes, head) {
 		drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
-		drm_mode_debug_printmodeline(mode);
+		drm_dbg_kms(dev, "Probed mode: " DRM_MODE_FMT "\n",
+			    DRM_MODE_ARG(mode));
 	}
 
 	return count;
@@ -643,7 +716,7 @@ EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
  * @dev: drm_device whose connector state changed
  *
  * This function fires off the uevent for userspace and also calls the
- * output_poll_changed function, which is most commonly used to inform the fbdev
+ * client hotplug function, which is most commonly used to inform the fbdev
  * emulation code and allow it to update the fbcon output configuration.
  *
  * Drivers should call this from their hotplug handling code when a change is
@@ -659,11 +732,7 @@ EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
  */
 void drm_kms_helper_hotplug_event(struct drm_device *dev)
 {
-	/* send a uevent + call fbdev */
 	drm_sysfs_hotplug_event(dev);
-	if (dev->mode_config.funcs->output_poll_changed)
-		dev->mode_config.funcs->output_poll_changed(dev);
-
 	drm_client_dev_hotplug(dev);
 }
 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
@@ -679,11 +748,7 @@ void drm_kms_helper_connector_hotplug_event(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
 
-	/* send a uevent + call fbdev */
 	drm_sysfs_connector_hotplug_event(connector);
-	if (dev->mode_config.funcs->output_poll_changed)
-		dev->mode_config.funcs->output_poll_changed(dev);
-
 	drm_client_dev_hotplug(dev);
 }
 EXPORT_SYMBOL(drm_kms_helper_connector_hotplug_event);
@@ -705,8 +770,13 @@ static void output_poll_execute(struct work_struct *work)
 	changed = dev->mode_config.delayed_event;
 	dev->mode_config.delayed_event = false;
 
-	if (!drm_kms_helper_poll)
+	if (!drm_kms_helper_poll) {
+		if (dev->mode_config.poll_running) {
+			drm_kms_helper_disable_hpd(dev);
+			dev->mode_config.poll_running = false;
+		}
 		goto out;
+	}
 
 	if (!mutex_trylock(&dev->mode_config.mutex)) {
 		repoll = true;
@@ -759,14 +829,12 @@ static void output_poll_execute(struct work_struct *work)
 			old = drm_get_connector_status_name(old_status);
 			new = drm_get_connector_status_name(connector->status);
 
-			DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
-				      "status updated from %s to %s\n",
-				      connector->base.id,
-				      connector->name,
-				      old, new);
-			DRM_DEBUG_KMS("[CONNECTOR:%d:%s] epoch counter %llu -> %llu\n",
-				      connector->base.id, connector->name,
-				      old_epoch_counter, connector->epoch_counter);
+			drm_dbg_kms(dev, "[CONNECTOR:%d:%s] status updated from %s to %s\n",
+				    connector->base.id, connector->name,
+				    old, new);
+			drm_dbg_kms(dev, "[CONNECTOR:%d:%s] epoch counter %llu -> %llu\n",
+				    connector->base.id, connector->name,
+				    old_epoch_counter, connector->epoch_counter);
 
 			changed = true;
 		}
@@ -813,15 +881,24 @@ EXPORT_SYMBOL(drm_kms_helper_is_poll_worker);
  * not an error to call this even when output polling isn't enabled or already
  * disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable().
  *
+ * If however, the polling was never initialized, this call will trigger a
+ * warning and return.
+ *
  * Note that calls to enable and disable polling must be strictly ordered, which
  * is automatically the case when they're only call from suspend/resume
  * callbacks.
  */
 void drm_kms_helper_poll_disable(struct drm_device *dev)
 {
-	if (!dev->mode_config.poll_enabled)
+	if (drm_WARN_ON(dev, !dev->mode_config.poll_enabled))
 		return;
+
+	if (dev->mode_config.poll_running)
+		drm_kms_helper_disable_hpd(dev);
+
 	cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
+
+	dev->mode_config.poll_running = false;
 }
 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
 
@@ -862,11 +939,39 @@ void drm_kms_helper_poll_fini(struct drm_device *dev)
 	if (!dev->mode_config.poll_enabled)
 		return;
 
+	drm_kms_helper_poll_disable(dev);
+
 	dev->mode_config.poll_enabled = false;
-	cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
 }
 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
 
+static void drm_kms_helper_poll_init_release(struct drm_device *dev, void *res)
+{
+	drm_kms_helper_poll_fini(dev);
+}
+
+/**
+ * drmm_kms_helper_poll_init - initialize and enable output polling
+ * @dev: drm_device
+ *
+ * This function initializes and then also enables output polling support for
+ * @dev similar to drm_kms_helper_poll_init(). Polling will automatically be
+ * cleaned up when the DRM device goes away.
+ *
+ * See drm_kms_helper_poll_init() for more information.
+ */
+void drmm_kms_helper_poll_init(struct drm_device *dev)
+{
+	int ret;
+
+	drm_kms_helper_poll_init(dev);
+
+	ret = drmm_add_action_or_reset(dev, drm_kms_helper_poll_init_release, dev);
+	if (ret)
+		drm_warn(dev, "Connector status will not be updated, error %d\n", ret);
+}
+EXPORT_SYMBOL(drmm_kms_helper_poll_init);
+
 static bool check_connector_changed(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
@@ -1039,42 +1144,6 @@ enum drm_mode_status drm_crtc_helper_mode_valid_fixed(struct drm_crtc *crtc,
 EXPORT_SYMBOL(drm_crtc_helper_mode_valid_fixed);
 
 /**
- * drm_connector_helper_get_modes_from_ddc - Updates the connector's EDID
- *                                           property from the connector's
- *                                           DDC channel
- * @connector: The connector
- *
- * Returns:
- * The number of detected display modes.
- *
- * Uses a connector's DDC channel to retrieve EDID data and update the
- * connector's EDID property and display modes. Drivers can use this
- * function to implement struct &drm_connector_helper_funcs.get_modes
- * for connectors with a DDC channel.
- */
-int drm_connector_helper_get_modes_from_ddc(struct drm_connector *connector)
-{
-	struct edid *edid;
-	int count = 0;
-
-	if (!connector->ddc)
-		return 0;
-
-	edid = drm_get_edid(connector, connector->ddc);
-
-	// clears property if EDID is NULL
-	drm_connector_update_edid_property(connector, edid);
-
-	if (edid) {
-		count = drm_add_edid_modes(connector, edid);
-		kfree(edid);
-	}
-
-	return count;
-}
-EXPORT_SYMBOL(drm_connector_helper_get_modes_from_ddc);
-
-/**
  * drm_connector_helper_get_modes_fixed - Duplicates a display mode for a connector
  * @connector: the connector
  * @fixed_mode: the display hardware's mode
@@ -1140,10 +1209,124 @@ int drm_connector_helper_get_modes(struct drm_connector *connector)
 	 * EDID. Otherwise, if the EDID is NULL, clear the connector
 	 * information.
 	 */
-	count = drm_edid_connector_update(connector, drm_edid);
+	drm_edid_connector_update(connector, drm_edid);
+
+	count = drm_edid_connector_add_modes(connector);
 
 	drm_edid_free(drm_edid);
 
 	return count;
 }
 EXPORT_SYMBOL(drm_connector_helper_get_modes);
+
+/**
+ * drm_connector_helper_tv_get_modes - Fills the modes availables to a TV connector
+ * @connector: The connector
+ *
+ * Fills the available modes for a TV connector based on the supported
+ * TV modes, and the default mode expressed by the kernel command line.
+ *
+ * This can be used as the default TV connector helper .get_modes() hook
+ * if the driver does not need any special processing.
+ *
+ * Returns:
+ * The number of modes added to the connector.
+ */
+int drm_connector_helper_tv_get_modes(struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+	struct drm_property *tv_mode_property =
+		dev->mode_config.tv_mode_property;
+	struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
+	unsigned int ntsc_modes = BIT(DRM_MODE_TV_MODE_NTSC) |
+		BIT(DRM_MODE_TV_MODE_NTSC_443) |
+		BIT(DRM_MODE_TV_MODE_NTSC_J) |
+		BIT(DRM_MODE_TV_MODE_PAL_M);
+	unsigned int pal_modes = BIT(DRM_MODE_TV_MODE_PAL) |
+		BIT(DRM_MODE_TV_MODE_PAL_N) |
+		BIT(DRM_MODE_TV_MODE_SECAM);
+	unsigned int tv_modes[2] = { UINT_MAX, UINT_MAX };
+	unsigned int i, supported_tv_modes = 0;
+
+	if (!tv_mode_property)
+		return 0;
+
+	for (i = 0; i < tv_mode_property->num_values; i++)
+		supported_tv_modes |= BIT(tv_mode_property->values[i]);
+
+	if (((supported_tv_modes & ntsc_modes) &&
+	     (supported_tv_modes & pal_modes)) ||
+	    (supported_tv_modes & BIT(DRM_MODE_TV_MODE_MONOCHROME))) {
+		uint64_t default_mode;
+
+		if (drm_object_property_get_default_value(&connector->base,
+							  tv_mode_property,
+							  &default_mode))
+			return 0;
+
+		if (cmdline->tv_mode_specified)
+			default_mode = cmdline->tv_mode;
+
+		if (BIT(default_mode) & ntsc_modes) {
+			tv_modes[0] = DRM_MODE_TV_MODE_NTSC;
+			tv_modes[1] = DRM_MODE_TV_MODE_PAL;
+		} else {
+			tv_modes[0] = DRM_MODE_TV_MODE_PAL;
+			tv_modes[1] = DRM_MODE_TV_MODE_NTSC;
+		}
+	} else if (supported_tv_modes & ntsc_modes) {
+		tv_modes[0] = DRM_MODE_TV_MODE_NTSC;
+	} else if (supported_tv_modes & pal_modes) {
+		tv_modes[0] = DRM_MODE_TV_MODE_PAL;
+	} else {
+		return 0;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(tv_modes); i++) {
+		struct drm_display_mode *mode;
+
+		if (tv_modes[i] == DRM_MODE_TV_MODE_NTSC)
+			mode = drm_mode_analog_ntsc_480i(dev);
+		else if (tv_modes[i] == DRM_MODE_TV_MODE_PAL)
+			mode = drm_mode_analog_pal_576i(dev);
+		else
+			break;
+		if (!mode)
+			return i;
+		if (!i)
+			mode->type |= DRM_MODE_TYPE_PREFERRED;
+		drm_mode_probed_add(connector, mode);
+	}
+
+	return i;
+}
+EXPORT_SYMBOL(drm_connector_helper_tv_get_modes);
+
+/**
+ * drm_connector_helper_detect_from_ddc - Read EDID and detect connector status.
+ * @connector: The connector
+ * @ctx: Acquire context
+ * @force: Perform screen-destructive operations, if necessary
+ *
+ * Detects the connector status by reading the EDID using drm_probe_ddc(),
+ * which requires connector->ddc to be set. Returns connector_status_connected
+ * on success or connector_status_disconnected on failure.
+ *
+ * Returns:
+ * The connector status as defined by enum drm_connector_status.
+ */
+int drm_connector_helper_detect_from_ddc(struct drm_connector *connector,
+					 struct drm_modeset_acquire_ctx *ctx,
+					 bool force)
+{
+	struct i2c_adapter *ddc = connector->ddc;
+
+	if (!ddc)
+		return connector_status_unknown;
+
+	if (drm_probe_ddc(ddc))
+		return connector_status_connected;
+
+	return connector_status_disconnected;
+}
+EXPORT_SYMBOL(drm_connector_helper_detect_from_ddc);