drm/exynos: restored kernel_fb_list when reiniting fb_helper

during recreating exynos_drm_fbdev as a new display device probes,
fb_helper is reinitialized but kernel fb is not changed
so kernel_fb_list should be restored after fb_helper is reinitialized.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
index 1f4b3d1a7713..74092a81c180 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
@@ -405,6 +405,18 @@ int exynos_drm_fbdev_reinit(struct drm_device *dev)
         fb_helper = private->fb_helper;
 
         if (fb_helper) {
+                struct list_head temp_list;
+
+                INIT_LIST_HEAD(&temp_list);
+
+                /*
+                 * fb_helper is reintialized but kernel fb is reused
+                 * so kernel_fb_list need to be backuped and restored
+                 */
+                if (!list_empty(&fb_helper->kernel_fb_list))
+                        list_replace_init(&fb_helper->kernel_fb_list,
+                                        &temp_list);
+
                 drm_fb_helper_fini(fb_helper);
 
                 ret = drm_fb_helper_init(dev, fb_helper,
@@ -414,6 +426,9 @@ int exynos_drm_fbdev_reinit(struct drm_device *dev)
                         return ret;
                 }
 
+                if (!list_empty(&temp_list))
+                        list_replace(&temp_list, &fb_helper->kernel_fb_list);
+
                 ret = drm_fb_helper_single_add_all_connectors(fb_helper);
                 if (ret < 0) {
                         DRM_ERROR("failed to add fb helper to connectors\n");