[PATCH 08/20] ASoC: SOF: Intel: hda: retrieve SoundWire eml_lock and pass pointer

[Bard Liao]

From: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>

Use new helper and interface to make sure the HDaudio and SoundWire
parts use the same mutex when accessing shared registers.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Reviewed-by: Rander Wang <rander.wang@xxxxxxxxx>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx>
Signed-off-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>
---
 sound/soc/sof/intel/hda.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sound/soc/sof/intel/hda.c b/sound/soc/sof/intel/hda.c
index 22eba57bb3e6..f8cd5a9ebad1 100644
--- a/sound/soc/sof/intel/hda.c
+++ b/sound/soc/sof/intel/hda.c
@@ -215,6 +215,15 @@ static int hda_sdw_probe(struct snd_sof_dev *sdev)
 		res.alh_base = hdev->desc->sdw_alh_base;
 		res.ext = false;
 	} else {
+		/*
+		 * retrieve eml_lock needed to protect shared registers
+		 * in the HDaudio multi-link areas
+		 */
+		res.eml_lock = hdac_bus_eml_get_mutex(sof_to_bus(sdev), true,
+						      AZX_REG_ML_LEPTR_ID_SDW);
+		if (!res.eml_lock)
+			return -ENODEV;
+
 		res.mmio_base = sdev->bar[HDA_DSP_HDA_BAR];
 		/*
 		 * the SHIM and SoundWire register offsets are link-specific
-- 
2.25.1