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Subject[PATCH v3 0/4] drm/mxsfb: Fix runtime PM for unpowering lcdif block
Adding lcdif nodes to a power domain currently does work, it results in
black/corrupted screens or hangs. While the driver does enable runtime
pm it does not deal correctly with the block being unpowered.

Changes since v2:
* Split into multiple commits.
* Use #ifdef CONFIG_PM_SLEEP.
* Switch to drm_atomic_helper_commit_tail_rpm

Patch 1 was split because it's useful alone.

Patches 2/3 could maybe be squashed.

I'm not sure patch 4 handles vblanks correctly. It does not replace
patch 1 because there is still a small window between enabling the pipe
and the first atomic_update and also somebody needs to write to

Link to v2:

drivers/gpu/drm/mxsfb/mxsfb_crtc.c | 42 +++++++++++++++++++++---------
drivers/gpu/drm/mxsfb/mxsfb_drv.c | 40 ++++++++++++++++++++++++++++
2 files changed, 69 insertions(+), 13 deletions(-)


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