dapm_connect_dai_pair() handles
"Normal/Codec2Codec" x "CPU/Codec" x "Playback/Capture".

(A) is "Codec2Codec" case of "CPU"   widget x "Playback/Capture",
(B) is "Normal"      case of "CPU"   widget x "Playback/Capture",
(C) is each          case of "Codec" widget.

(X) is handling "Playback" case DAI connecting,
(Y) is handling "Capture"  case DAI connecting.

	static void dapm_connect_dai_pair(...)
	{
		...

(A)		if (dai_link->params) {
			playback_cpu	= ...
			capture_cpu	= ...
(B)		} else {
			playback_cpu	= ...
			capture_cpu	= ...
		}

 ^		/* connect BE DAI playback if widgets are valid */
 |		stream = SNDRV_PCM_STREAM_PLAYBACK;
 | (C)		codec = codec_dai->playback_widget;
 |
 |		if (playback_cpu && codec) {
(X)			if (dai_link->params && !rtd->c2c_widget[stream]) {
 |				...
 |			}
 |
 | (z)			dapm_connect_dai_routes(...);
 v		}

	capture:
 ^		/* connect BE DAI capture if widgets are valid */
 |		stream = SNDRV_PCM_STREAM_CAPTURE;
 | (C)		codec = codec_dai->capture_widget;
 |
 |		if (codec && capture_cpu) {
(Y)			if (dai_link->params && !rtd->c2c_widget[stream]) {
 |				...
 |			}
 |
 | (z)			dapm_connect_dai_routes(...);
 v		}
	}

(X) part and (Y) part are almost same.
Main purpose of these parts (and this function) is calling
dapm_connect_dai_routes() (= z) on each cases.
The difference is "parameter"
(= Normal/Codec2Codec x CPU/Codec x Playback/Capture).

This patch cleanup these, but nothing changed for meaning.

Link: https://lore.kernel.org/r/87ilen6ni4.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/877cuqvswc.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>