[PATCH v3 2/6] drm/client: Add drm_client_modeset_disable()

["Noralf Trønnes" <noralf@tronnes.org>]

Add a way for clients to disable all outputs.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
 drivers/gpu/drm/drm_client_modeset.c | 20 ++++++++++++++++++++
 include/drm/drm_client.h             |  1 +
 2 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
index 27e2fb41f14d..977bcd063520 100644
--- a/drivers/gpu/drm/drm_client_modeset.c
+++ b/drivers/gpu/drm/drm_client_modeset.c
@@ -1225,3 +1225,23 @@ int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
 	return ret;
 }
 EXPORT_SYMBOL(drm_client_modeset_dpms);
+
+/**
+ * drm_client_modeset_disable() - Disable all outputs
+ * @client: DRM client
+ *
+ * This function disables all outputs by first clearing the modeset array and
+ * then committing the empty modesets.
+ *
+ * Returns:
+ * Zero on success or negative error code on failure.
+ */
+int drm_client_modeset_disable(struct drm_client_dev *client)
+{
+	mutex_lock(&client->modeset_mutex);
+	drm_client_modeset_release(client);
+	mutex_unlock(&client->modeset_mutex);
+
+	return drm_client_modeset_commit(client);
+}
+EXPORT_SYMBOL(drm_client_modeset_disable);
diff --git a/include/drm/drm_client.h b/include/drm/drm_client.h
index 76704f48fc46..498089b647da 100644
--- a/include/drm/drm_client.h
+++ b/include/drm/drm_client.h
@@ -168,6 +168,7 @@ int drm_client_modeset_check(struct drm_client_dev *client);
 int drm_client_modeset_commit_locked(struct drm_client_dev *client);
 int drm_client_modeset_commit(struct drm_client_dev *client);
 int drm_client_modeset_dpms(struct drm_client_dev *client, int mode);
+int drm_client_modeset_disable(struct drm_client_dev *client);
 
 /**
  * drm_client_for_each_modeset() - Iterate over client modesets
-- 
2.23.0