drm/i915/skl: Display the WRPLL frequency we couldn't accomodate when failing

This helps debugging.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_ddi.c

@@ -1194,7 +1194,8 @@ skl_ddi_calculate_wrpll(int clock /* in Hz */,
 	}
 
 	if (min_dco_index > 2) {
-		WARN(1, "No valid values found for the given pixel clock\n");
+		WARN(1, "No valid parameters found for pixel clock: %dHz\n",
+		     clock);
 	} else {
 		wrpll_params->central_freq = dco_central_freq[min_dco_index];