ASoC: intel/skl/hda - fix oops on systems without i915 audio codec

Recent fix for jack detection caused a regression on systems with HDA
audio codec but no HDMI/DP audio via i915 graphics, leading to a kernel
oops at device probe. On these systems, HDA bus instance lookup fails,
as the first ASoC runtime of the card is connected to a dummy codec
(as no HDMI codec is present).

Fixes: 3a24f135 ("ASoC: intel/skl/hda - set autosuspend timeout for hda codecs")
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20200420205431.13070-1-kai.vehmanen@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/skl_hda_dsp_generic.c

@@ -172,23 +172,25 @@ static int skl_hda_fill_card_info(struct snd_soc_acpi_mach_params *mach_params)
 
 static void skl_set_hda_codec_autosuspend_delay(struct snd_soc_card *card)
 {
-	struct snd_soc_pcm_runtime *rtd =
-		list_first_entry(&card->rtd_list,
-				 struct snd_soc_pcm_runtime, list);
-	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
+	struct snd_soc_pcm_runtime *rtd;
 	struct hdac_hda_priv *hda_pvt;
-
-	if (!codec_dai)
-		return;
-
+	struct snd_soc_dai *dai;
+
+	for_each_card_rtds(card, rtd) {
+		if (!strstr(rtd->dai_link->codecs->name, "ehdaudio"))
+			continue;
+		dai = asoc_rtd_to_codec(rtd, 0);
+		hda_pvt = snd_soc_component_get_drvdata(dai->component);
+		if (hda_pvt) {
 			/*
 			 * all codecs are on the same bus, so it's sufficient
-	 * to lookup the first runtime and its codec, and set
-	 * power save defaults for all codecs on the bus
+			 * to look up only the first one
 			 */
-	hda_pvt = snd_soc_component_get_drvdata(codec_dai->component);
 			snd_hda_set_power_save(hda_pvt->codec.bus,
 					       HDA_CODEC_AUTOSUSPEND_DELAY_MS);
+			break;
+		}
+	}
 }
 
 static int skl_hda_audio_probe(struct platform_device *pdev)