drm/probe-helper: use drm_kms_helper_connector_hotplug_event

If an hotplug event only updates a single connector, use
drm_kms_helper_connector_hotplug_event instead of
drm_kms_helper_hotplug_event.

Changes in v4:
- Simplify loop logic (Ville, Sam)
- Update drm_connector_helper_hpd_irq_event (Maxime)

Signed-off-by: Simon Ser <contact@emersion.fr>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Reviewed-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211018084707.32253-6-contact@emersion.fr

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 3aef3b1..6823595 100644 (file)
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -888,7 +888,7 @@ bool drm_connector_helper_hpd_irq_event(struct drm_connector *connector)
        mutex_unlock(&dev->mode_config.mutex);
 
        if (changed) {
-               drm_kms_helper_hotplug_event(dev);
+               drm_kms_helper_connector_hotplug_event(connector);
                drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Sent hotplug event\n",
                            connector->base.id,
                            connector->name);
@@ -927,9 +927,9 @@ EXPORT_SYMBOL(drm_connector_helper_hpd_irq_event);
  */
 bool drm_helper_hpd_irq_event(struct drm_device *dev)
 {
-       struct drm_connector *connector;
+       struct drm_connector *connector, *first_changed_connector = NULL;
        struct drm_connector_list_iter conn_iter;
-       bool changed = false;
+       int changed = 0;
 
        if (!dev->mode_config.poll_enabled)
                return false;
@@ -941,16 +941,25 @@ bool drm_helper_hpd_irq_event(struct drm_device *dev)
                if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
                        continue;
 
-               if (check_connector_changed(connector))
-                       changed = true;
+               if (check_connector_changed(connector)) {
+                       if (!first_changed_connector) {
+                               drm_connector_get(connector);
+                               first_changed_connector = connector;
+                       }
+
+                       changed++;
+               }
        }
        drm_connector_list_iter_end(&conn_iter);
        mutex_unlock(&dev->mode_config.mutex);
 
-       if (changed) {
+       if (changed == 1)
+               drm_kms_helper_connector_hotplug_event(first_changed_connector);
+       else if (changed > 0)
                drm_kms_helper_hotplug_event(dev);
-               DRM_DEBUG_KMS("Sent hotplug event\n");
-       }
+
+       if (first_changed_connector)
+               drm_connector_put(first_changed_connector);
 
        return changed;
 }