[PATCH 10/10] ASoC: SOF: Intel: hda: Add a virtual CPU DAI

[Peter Ujfalusi <peter.ujfalusi@linux.intel.com>]

From: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

Add a virtual CPU DAI for loopback capture for echo reference
implementation. We can't use the snd-soc-dummy-dai because it is already
used for the bluetooth DAI link.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Reviewed-by: Mateusz Redzynia <mateuszx.redzynia@intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
---
 sound/soc/sof/intel/hda-dai.c | 8 ++++++++
 sound/soc/sof/intel/hda.h     | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/intel/hda-dai.c b/sound/soc/sof/intel/hda-dai.c
index 3c742d535133..15faedeec16d 100644
--- a/sound/soc/sof/intel/hda-dai.c
+++ b/sound/soc/sof/intel/hda-dai.c
@@ -866,6 +866,14 @@ struct snd_soc_dai_driver skl_dai[] = {
 		.channels_max = 4,
 	},
 },
+{
+	/* Virtual CPU DAI for Echo reference */
+	.name = "Loopback Virtual Pin",
+	.capture = {
+		.channels_min = 1,
+		.channels_max = 2,
+	},
+},
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
 {
 	.name = "iDisp1 Pin",
diff --git a/sound/soc/sof/intel/hda.h b/sound/soc/sof/intel/hda.h
index 3be39c229c9f..6199002b0c13 100644
--- a/sound/soc/sof/intel/hda.h
+++ b/sound/soc/sof/intel/hda.h
@@ -418,10 +418,10 @@
 	(HDA_DSP_BDL_SIZE / sizeof(struct sof_intel_dsp_bdl))
 
 /* Number of DAIs */
-#define SOF_SKL_NUM_DAIS_NOCODEC	8
+#define SOF_SKL_NUM_DAIS_NOCODEC	9
 
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
-#define SOF_SKL_NUM_DAIS		15
+#define SOF_SKL_NUM_DAIS		16
 #else
 #define SOF_SKL_NUM_DAIS		SOF_SKL_NUM_DAIS_NOCODEC
 #endif
-- 
2.52.0