[PATCH] ASoC: SOF: Intel: hda: enforce exclusion between HDaudio and SoundWire

[Pierre-Louis Bossart]

On some platforms with an external HDaudio codec, the DSDT reports the
presence of SoundWire devices. Pin-mux restrictions and board reworks
usually prevent coexistence between the two types of links, let's
prevent unnecessary operations from starting.

In the case of a single iDISP codec being detected, we still start the
links even if no SoundWire machine configuration was detected, so that
we can double-check what the hardware is and add the missing
configuration if applicable.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
Reviewed-by: Bard Liao <bard.liao at intel.com>
---
 sound/soc/sof/intel/hda.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sound/soc/sof/intel/hda.c b/sound/soc/sof/intel/hda.c
index e1e368ff2b12..891e6e1b9121 100644
--- a/sound/soc/sof/intel/hda.c
+++ b/sound/soc/sof/intel/hda.c
@@ -187,12 +187,16 @@ static int hda_sdw_probe(struct snd_sof_dev *sdev)
 int hda_sdw_startup(struct snd_sof_dev *sdev)
 {
 	struct sof_intel_hda_dev *hdev;
+	struct snd_sof_pdata *pdata = sdev->pdata;
 
 	hdev = sdev->pdata->hw_pdata;
 
 	if (!hdev->sdw)
 		return 0;
 
+	if (pdata->machine && !pdata->machine->mach_params.link_mask)
+		return 0;
+
 	return sdw_intel_startup(hdev->sdw);
 }
 
@@ -1002,6 +1006,14 @@ static int hda_generic_machine_select(struct snd_sof_dev *sdev)
 			hda_mach->mach_params.dmic_num = dmic_num;
 			pdata->machine = hda_mach;
 			pdata->tplg_filename = tplg_filename;
+
+			if (codec_num == 2) {
+				/*
+				 * Prevent SoundWire links from starting when an external
+				 * HDaudio codec is used
+				 */
+				hda_mach->mach_params.link_mask = 0;
+			}
 		}
 	}
 
-- 
2.25.1