[PATCH 0/7][SRU][OEM-B][B] drm/i915: Fix hotplug issues

[You-Sheng Yang]

BugLink: http://bugs.launchpad.net/bugs/1835001

[Impact]
System does not always auto detect disconnection of external monitor on
Intel VGA.

[Fix]
Two changes from drm-intel tree along with their prerequisites are
necessary to introduce hotplug retrying to fix this issue. They are:

  * drm/i915: Add support for retrying hotplug
  * drm/i915: Enable hotplug retry

All the prerequisites have been landed to kernel mainline, but the
target two changes have not.

[Test Case]
1. open "system settings > display settings"
2. connect laptop to an external HDMI monitor via HDMI port & cable
3. unplug the HDMI cable
4. check if "display settings" automatically detects the removal of the
external monitor

[Regression potential]
Medium. For all the prerequisites they have been landed since 4.18, and
the last two patches will only be merged some time later. Basically it
turns a currently existing kernel work to a delayed work so that it may
retry probing HDMI hotplug status.

Imre Deak (1):
  drm/i915: Add support for retrying hotplug

José Roberto de Souza (1):
  drm/i915: Enable hotplug retry

Ville Syrjälä (5):
  drm/i915: Convert intel_hpd_irq_event() into an encoder hotplug hook
  drm/i915: Reinitialize sink scrambling/TMDS clock ratio on HPD
  drm/i915: Move SST DP link retraining into the ->post_hotplug() hook
  drm/i915: Nuke intel_dp->channel_eq_status
  drm/i915: Track whether the DP link is trained or not

 drivers/gpu/drm/i915/i915_debugfs.c           |   2 +
 drivers/gpu/drm/i915/i915_drv.h               |   3 +-
 drivers/gpu/drm/i915/intel_crt.c              |   4 +-
 drivers/gpu/drm/i915/intel_ddi.c              | 171 +++++++++++++++++
 drivers/gpu/drm/i915/intel_dp.c               | 179 +++++++++++++-----
 drivers/gpu/drm/i915/intel_dp_link_training.c |   8 +-
 drivers/gpu/drm/i915/intel_drv.h              |  18 +-
 drivers/gpu/drm/i915/intel_hdmi.c             |  27 +++
 drivers/gpu/drm/i915/intel_hotplug.c          |  76 ++++++--
 drivers/gpu/drm/i915/intel_sdvo.c             |  14 +-
 10 files changed, 423 insertions(+), 79 deletions(-)

-- 
2.20.1