Fix drm suspend and resume issue

[jason-jh.lin]

Subject: [PATCH 0/3] Fix drm suspend and resume issue

1. When the hardwire components on crtc is using GCE to configure their
   register, cmdq_suspend may be called.
   So add cmdq_mbox_flush to clear all tasks and release GCE clocks
   before cmdq_suspend.

2. The suspend and resume order of components on crtc can be guaranteed
   by the same power-domain, but cmdq can not.
   So add devlink to cmdq dev make sure the order of suspend and resume:
   cmdq_suspend is latter than drm_suspend and
   cmdq_resume is earlier than drm_resume.

jason-jh.lin (3):
  mialbox: move cmdq suspend,resume and remove after cmdq_mbox_flush
  mailbox: add cmdq_mbox_flush to clear all task before suspend
  drm/mediatek: add devlink to cmdq dev

 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 13 ++++
 drivers/mailbox/mtk-cmdq-mailbox.c      | 81 ++++++++++++-------------
 2 files changed, 52 insertions(+), 42 deletions(-)

-- 
2.18.0