drm/i915: don't assert_pch_pll_enabled on lpt_enable_pch_transcoder

These asserts are specific to IBX/CPT/PPT. Inside the assert_pch_pll
function we even "return" in case we detect LPT, but I prefer to just
not call it. In the future we might rename to something like
ibx_assert_pch_pll.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -1722,16 +1722,10 @@ static void lpt_enable_pch_transcoder(struct drm_i915_private *dev_priv,
 {
 	int reg;
 	u32 val, pipeconf_val;
-	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
 
 	/* PCH only available on ILK+ */
 	BUG_ON(dev_priv->info->gen < 5);
 
-	/* Make sure PCH DPLL is enabled */
-	assert_pch_pll_enabled(dev_priv,
-			       to_intel_crtc(crtc)->pch_pll,
-			       to_intel_crtc(crtc));
-
 	/* FDI must be feeding us bits for PCH ports */
 	assert_fdi_tx_enabled(dev_priv, pipe);
 	assert_fdi_rx_enabled(dev_priv, pipe);