ASoC: SOF: Intel: hda: use fallback for firmware name

We have platforms such as CFL with no known I2S codec being used, and
the ACPI tables are currently empty, so fall-back to using the
firmware filename used in nocodec mode
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191111222901.19892-4-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/hda.c

@@ -415,9 +415,16 @@ static int hda_init_caps(struct snd_sof_dev *sdev)
 			pdata->tplg_filename =
 				hda_mach->sof_tplg_filename;
 
-			/* firmware: pick the first in machine list */
+			/*
+			 * firmware: pick the first in machine list,
+			 * or use nocodec firmware name if list is empty
+			 */
 			mach = pdata->desc->machines;
-			pdata->fw_filename = mach->sof_fw_filename;
+			if (mach->id[0])
+				pdata->fw_filename = mach->sof_fw_filename;
+			else
+				pdata->fw_filename =
+					pdata->desc->nocodec_fw_filename;
 
 			dev_info(bus->dev, "using HDA machine driver %s now\n",
 				 hda_mach->drv_name);