drm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL

drm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL

Apparently ICL may hang with an MCE if we write TRANS_VRR_VMAX/FLIPLINE
before enabling TRANS_DDI_FUNC_CTL.

Personally I was only able to reproduce a hang (on an Dell XPS 7390
2-in-1) with an external display connected via a dock using a dodgy
type-C cable that made the link training fail. After the failed
link training the machine would hang. TGL seemed immune to the
problem for whatever reason.

BSpec does tell us to configure VRR after enabling TRANS_DDI_FUNC_CTL
as well. The DMC firmware also does the VRR restore in two stages:
- first stage seems to be unconditional and includes TRANS_VRR_CTL
  and a few other VRR registers, among other things
- second stage is conditional on the DDI being enabled,
  and includes TRANS_DDI_FUNC_CTL and TRANS_VRR_VMAX/VMIN/FLIPLINE,
  among other things

So let's reorder the steps to match to avoid the hang, and
toss in an extra WARN to make sure we don't screw this up later.

BSpec: 22243
Cc: stable@vger.kernel.org
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reported-by: Benjamin Tissoires <bentiss@kernel.org>
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/15777
Tested-by: Benjamin Tissoires <bentiss@kernel.org>
Fixes: dda7dcd9da73 ("drm/i915/vrr: Use fixed timings for platforms that support VRR")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260303095414.4331-1-ville.syrjala@linux.intel.com
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
(cherry picked from commit 93f3a267c3dd4d811b224bb9e179a10d81456a74)
Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>