drm/i915: Remove bogus ips_enabled check.

The flag just tells us IPS can be enabled, if the primary plane
is not enabled it means IPS might not be. This never triggered
in CI because we don't have a haswell ULT there, but can be
reproduced easily with kms_atomic_transitions.plane-all-modeset-transition
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171110113503.16253-2-maarten.lankhorst@linux.intel.com
[mlankhorst: Remove from haswell_get_pipe_config too. (danvet)]
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -9233,10 +9233,6 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
 			ironlake_get_pfit_config(crtc, pipe_config);
 	}
 
-	if (IS_HASWELL(dev_priv))
-		pipe_config->ips_enabled = hsw_crtc_supports_ips(crtc) &&
-			(I915_READ(IPS_CTL) & IPS_ENABLE);
-
 	if (pipe_config->cpu_transcoder != TRANSCODER_EDP &&
 	    !transcoder_is_dsi(pipe_config->cpu_transcoder)) {
 		pipe_config->pixel_multiplier =
@@ -11259,10 +11255,6 @@ intel_pipe_config_compare(struct drm_i915_private *dev_priv,
 		PIPE_CONF_CHECK_CLOCK_FUZZY(pixel_rate);
 	}
 
-	/* BDW+ don't expose a synchronous way to read the state */
-	if (IS_HASWELL(dev_priv))
-		PIPE_CONF_CHECK_I(ips_enabled);
-
 	PIPE_CONF_CHECK_I(double_wide);
 
 	PIPE_CONF_CHECK_P(shared_dpll);