drm: msm: dp: add support for HPD notification to userspace

Add change to notify hot plug event to the userspace using the
uevent based mechanism present in DRM framework. Add change to
ensure proper teardown sequence for Display Port to come up on
subsequent plug events.

Change-Id: I856955ed11f4e0bdbc4981e7095f0db62f875276
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
4 files changed