FROMGIT: drm/i915/dp: Send only a single modeset-retry uevent for a commit

There are multiple failure cases a modeset-retry uevent can be sent for
a link (TBT tunnel BW allocation failure, unrecoverable link training
failure), a follow-up patch adding the handling for a new case where the
DP MST payload allocation fails. The uevent is the same in all cases,
sent to all the connectors on the link, so in case of multiple failures
there is no point in sending a separate uevent for each failure; prevent
this, sending only a single modeset-retry uevent for a commit.

Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240722165503.2084999-7-imre.deak@intel.com
(cherry picked from commit a4530e20
 https://gitlab.freedesktop.org/drm/i915/kernel.git

 drm-intel-next)

BUG=b:332903004, b:322223603
TEST=Verify the link training fallback for UHBR<->non-UHBR rates

Change-Id: I2cf0ddcc439725622556c4c3e775e0c3350e2dfe
Signed-off-by: Rakshith M O <rakshith.m.o@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5802905


Reviewed-by: Khaled Almahallawy <khaled.almahallawy@intel.com>
Reviewed-by: Manasi Navare <navaremanasi@chromium.org>
Reviewed-by: Sean Paul <sean@poorly.run>
Signed-off-by: Hubert Mazur <hmazur@google.com>