drm/i915: don't assert_panel_unlocked on LPT

There is no LVDS, so don't poke the LVDS registers.
Signed-off-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -3183,8 +3183,7 @@ static void lpt_pch_enable(struct drm_crtc *crtc)
 
 	lpt_program_iclkip(crtc);
 
-	/* set transcoder timing, panel must allow it */
-	assert_panel_unlocked(dev_priv, pipe);
+	/* Set transcoder timing. */
 	I915_WRITE(TRANS_HTOTAL(pipe), I915_READ(HTOTAL(pipe)));
 	I915_WRITE(TRANS_HBLANK(pipe), I915_READ(HBLANK(pipe)));
 	I915_WRITE(TRANS_HSYNC(pipe),  I915_READ(HSYNC(pipe)));