[PATCH v3 03/12] drm/exynos: disallow fbdev initialization if no device is connected

[Andrzej Hajda]

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 at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c 
b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
index e7c2f2d..e09449a 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;
-- 
1.8.3.2