drm/i915/audio: drop extra crtc clock check from HDMI audio N lookup

The array contains the crtc clock, rely on that. While at it, debug log
the HDMI N value or automatic mode.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: "Lin, Mengdong" <mengdong.lin@intel.com>
Cc: Libin Yang <libin.yang@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1477407258-30599-2-git-send-email-jani.nikula@intel.com

drivers/gpu/drm/i915/intel_audio.c

@@ -254,16 +254,15 @@ hsw_hdmi_audio_config_update(struct intel_crtc *intel_crtc, enum port port,
 	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
 	tmp |= audio_config_hdmi_pixel_clock(adjusted_mode);
 
-	if (adjusted_mode->crtc_clock == TMDS_296M ||
-	    adjusted_mode->crtc_clock == TMDS_297M) {
 	n = audio_config_hdmi_get_n(adjusted_mode, rate);
 	if (n != 0) {
+		DRM_DEBUG_KMS("using N %d\n", n);
+
 		tmp &= ~AUD_CONFIG_N_MASK;
 		tmp |= AUD_CONFIG_N(n);
 		tmp |= AUD_CONFIG_N_PROG_ENABLE;
 	} else {
-			DRM_DEBUG_KMS("no suitable N value is found\n");
-		}
+		DRM_DEBUG_KMS("using automatic N\n");
 	}
 
 	I915_WRITE(HSW_AUD_CFG(pipe), tmp);