[PATCH 0/3] drm/fb-helper: Restore damage worker

[Thomas Zimmermann]

It turns out that the removal of the damage worker can lead to
locking cycles. The display update now runs while holding the
fbdefio lock, which conflicts with locks in the modesetting code
that updates the display. There's no easy fix for this, so let's
restore the damage worker. The display update will then again run
outside of the fbdefio lock.

See [1] for bug reports.

[1] https://intel-gfx-ci.01.org/tree/drm-tip/fi-kbl-8809g.html

Thomas Zimmermann (3):
  Revert "drm/fb-helper: Remove damage worker"
  Revert "drm/fb-helper: Schedule deferred-I/O worker after writing to
    framebuffer"
  Revert "drm/fb-helper: Perform damage handling in deferred-I/O helper"

 drivers/gpu/drm/drm_fb_helper.c     | 30 +++++++++++++----------------
 drivers/video/fbdev/core/fb_defio.c | 16 ---------------
 include/drm/drm_fb_helper.h         |  2 ++
 include/linux/fb.h                  |  1 -
 4 files changed, 15 insertions(+), 34 deletions(-)

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2.38.1