drm/i915: Set hwmode during readout.

This was introduced after converting hw readout to atomic,
so it should have been part of the revert too.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90929
Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/intel_display.c

@@ -15357,6 +15357,7 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
 		crtc->base.state->enable = crtc->active;
 		crtc->base.state->active = crtc->active;
 		crtc->base.enabled = crtc->active;
+		crtc->base.hwmode = crtc->config->base.adjusted_mode;
 
 		plane_state = to_intel_plane_state(primary->state);
 		plane_state->visible = primary_get_hw_state(crtc);