drm/i915: Drop the drm_atomic_helper_calc_timestamping_constants() call

We update the timestamping constants per-crtc explicitly in
intel_crtc_update_active_timings(). Furtermore the helper will
use uapi.adjusted_mode whereas we want hw.adjusted_mode. Thus
let's drop the helper call an rely on what we already have in
intel_crtc_update_active_timings(). We can now also drop the
hw.adjusted_mode -> uapi.adjusted_mode copy hack that was added
to keep the helper from deriving the timestamping constants from
the wrong thing.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200907120026.6360-3-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/display/intel_display.c

@@ -13471,12 +13471,6 @@ intel_modeset_pipe_config(struct intel_crtc_state *pipe_config)
 		    "hw max bpp: %i, pipe bpp: %i, dithering: %i\n",
 		    base_bpp, pipe_config->pipe_bpp, pipe_config->dither);
 
-	/*
-	 * Make drm_calc_timestamping_constants in
-	 * drm_atomic_helper_update_legacy_modeset_state() happy
-	 */
-	pipe_config->uapi.adjusted_mode = pipe_config->hw.adjusted_mode;
-
 	return 0;
 }
 
@@ -15577,7 +15571,6 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 
 	if (state->modeset) {
 		drm_atomic_helper_update_legacy_modeset_state(dev, &state->base);
-		drm_atomic_helper_calc_timestamping_constants(&state->base);
 
 		intel_set_cdclk_pre_plane_update(state);