We've already seen that apps want to monitor the display config, and
some (like upowerd) poll for changes since we don't provide a
notification for general mode config changes, just hotplug events. So
add a new drm event, with CHANGE=1 set in the event, to allow for it.
Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 4c95b5f..174ee64 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1589,6 +1589,8 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
set.fb = fb;
ret = crtc->funcs->set_config(&set);
+ drm_sysfs_change_event(dev);
+
out:
kfree(connector_set);
mutex_unlock(&dev->mode_config.mutex);
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 9507204..df946d4 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -822,6 +822,8 @@ int drm_fb_helper_set_par(struct fb_info *info)
return ret;
}
}
+
+ drm_sysfs_change_event(dev);
mutex_unlock(&dev->mode_config.mutex);
if (fb_helper->delayed_hotplug) {
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 2eee8e0..fd3af31 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -467,9 +467,9 @@ EXPORT_SYMBOL(drm_sysfs_connector_remove);
* drm_sysfs_hotplug_event - generate a DRM uevent
* @dev: DRM device
*
- * Send a uevent for the DRM device specified by @dev. Currently we only
- * set HOTPLUG=1 in the uevent environment, but this could be expanded to
- * deal with other types of events.
+ * Send a uevent for the DRM device specified by @dev. Set HOTPLUG=1 in the
+ * event to indicate a display config change occurred, probably due to a
+ * display being added or removed.
*/
void drm_sysfs_hotplug_event(struct drm_device *dev)
{
@@ -483,6 +483,24 @@ void drm_sysfs_hotplug_event(struct drm_device *dev)
EXPORT_SYMBOL(drm_sysfs_hotplug_event);
/**
+ * drm_sysfs_change_event - generate a DRM uevent indicating a display config change
+ * @dev: DRM device
+ *
+ * Send a uevent for the DRM device specified by @dev. Set CHANGE=1 to
+ * indicate that a userspace initiated display configuration change occurred.
+ */
+void drm_sysfs_change_event(struct drm_device *dev)
+{
+ char *event_string = "CHANGE=1";
+ char *envp[] = { event_string, NULL };
+
+ DRM_DEBUG("generating hotplug event\n");
+
+ kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
+}
+EXPORT_SYMBOL(drm_sysfs_change_event);
+
+/**
* drm_sysfs_device_add - adds a class device to sysfs for a character driver
* @dev: DRM device to be added
* @head: DRM head in question
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index ad5770f..3aff8fc 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1506,6 +1506,7 @@ extern struct class *drm_sysfs_create(struct module *owner, char *name);
extern void drm_sysfs_destroy(void);
extern int drm_sysfs_device_add(struct drm_minor *minor);
extern void drm_sysfs_hotplug_event(struct drm_device *dev);
+extern void drm_sysfs_change_event(struct drm_device *dev);
extern void drm_sysfs_device_remove(struct drm_minor *minor);
extern char *drm_get_connector_status_name(enum drm_connector_status status);
extern int drm_sysfs_connector_add(struct drm_connector *connector);
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