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[    2.544744] ------------[ cut here ]------------
[    2.559370] WARNING: CPU: 0 PID: 62 at drivers/gpu/drm/drm_atomic_helper.c:1240 drm_atomic_helper_wait_for_vblanks.part.0+0x228/0x238
[    2.591766] [CRTC:29:crtc-0] vblank wait timed out
[    2.606709] Modules linked in:
[    2.619842] CPU: 0 PID: 62 Comm: kworker/0:2 Not tainted 4.14.0-licheepi-nano+ #20
[    2.637945] Hardware name: Allwinner suniv Family
[    2.653129] Workqueue: events output_poll_execute
[    2.668363] [<c010e560>] (unwind_backtrace) from [<c010b6b0>] (show_stack+0x10/0x14)
[    2.687095] [<c010b6b0>] (show_stack) from [<c0116674>] (__warn+0xd4/0xfc)
[    2.705063] [<c0116674>] (__warn) from [<c01166d4>] (warn_slowpath_fmt+0x38/0x48)
[    2.723858] [<c01166d4>] (warn_slowpath_fmt) from [<c03a9edc>] (drm_atomic_helper_wait_for_vblanks.part.0+0x228/0x238)
[    2.757086] [<c03a9edc>] (drm_atomic_helper_wait_for_vblanks.part.0) from [<c03ab230>] (drm_atomic_helper_commit_tail+0x54/0x64)
[    2.792043] [<c03ab230>] (drm_atomic_helper_commit_tail) from [<c03ab2bc>] (commit_tail+0x7c/0x80)
[    2.824752] [<c03ab2bc>] (commit_tail) from [<c03ab3e4>] (drm_atomic_helper_commit+0x11c/0x128)
[    2.845991] [<c03ab3e4>] (drm_atomic_helper_commit) from [<c03ad82c>] (restore_fbdev_mode_atomic+0x174/0x1cc)
[    2.880512] [<c03ad82c>] (restore_fbdev_mode_atomic) from [<c03b003c>] (drm_fb_helper_restore_fbdev_mode_unlocked.part.7+0x38/0x1bc)
[    2.918107] [<c03b003c>] (drm_fb_helper_restore_fbdev_mode_unlocked.part.7) from [<c03b0240>] (drm_fb_helper_set_par+0x4c/0x84)
[    2.957127] [<c03b0240>] (drm_fb_helper_set_par) from [<c03affd4>] (drm_fb_helper_hotplug_event.part.6+0xa0/0xb0)
[    2.996032] [<c03affd4>] (drm_fb_helper_hotplug_event.part.6) from [<c03a17b0>] (output_poll_execute+0x17c/0x198)
[    3.035298] [<c03a17b0>] (output_poll_execute) from [<c0129aa4>] (process_one_work+0x1d8/0x3ec)
[    3.059390] [<c0129aa4>] (process_one_work) from [<c0129d08>] (worker_thread+0x50/0x5b8)
[    3.082861] [<c0129d08>] (worker_thread) from [<c012eff8>] (kthread+0x120/0x138)
[    3.105573] [<c012eff8>] (kthread) from [<c0107dc8>] (ret_from_fork+0x14/0x2c)
[    3.128153] ---[ end trace bd0f0d9e9dc9ee54 ]---
[   13.284749] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR* [CRTC:29:crtc-0] flip_done timed out