drm/i915: kill intel_ddi_pll_select()

All it does is pick the encoder and call intel_get_shared_dpll(). We
can just do this in the caller. One less indirection level during code
reading.

As another plus, now the two callers of intel_get_shared_dpll() are
{ironlake,haswell}_crtc_compute_clock().

Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1490209125-20046-2-git-send-email-paulo.r.zanoni@intel.com
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6dc7555..e6f6406 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8835,8 +8835,14 @@ static int haswell_crtc_compute_clock(struct intel_crtc *crtc,
 				      struct intel_crtc_state *crtc_state)
 {
 	if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI)) {
-		if (!intel_ddi_pll_select(crtc, crtc_state))
+		struct intel_encoder *encoder =
+			intel_ddi_get_crtc_new_encoder(crtc_state);
+
+		if (!intel_get_shared_dpll(crtc, crtc_state, encoder)) {
+			DRM_DEBUG_DRIVER("failed to find PLL for pipe %c\n",
+					 pipe_name(crtc->pipe));
 			return -EINVAL;
+		}
 	}
 
 	crtc->lowfreq_avail = false;