drm/exynos: disallow fbdev initialization if no device is connected

This patch adds explicit check if there is a connector with
connected status before fbdev initialization. It prevents creation
of default fbdev 1024x768 which is unusable on panels with bigger resolutions.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
index 5fa342e5f963..addbf7536da4 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
@@ -237,6 +237,24 @@ static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
         .fb_probe =     exynos_drm_fbdev_create,
 };
 
+bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
+{
+        struct drm_connector *connector;
+        bool ret = false;
+
+        mutex_lock(&dev->mode_config.mutex);
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                if (connector->status != connector_status_connected)
+                        continue;
+
+                ret = true;
+                break;
+        }
+        mutex_unlock(&dev->mode_config.mutex);
+
+        return ret;
+}
+
 int exynos_drm_fbdev_init(struct drm_device *dev)
 {
         struct exynos_drm_fbdev *fbdev;
@@ -248,6 +266,9 @@ int exynos_drm_fbdev_init(struct drm_device *dev)
         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
                 return 0;
 
+        if (!exynos_drm_fbdev_is_anything_connected(dev))
+                return 0;
+
         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
         if (!fbdev)
                 return -ENOMEM;