[PATCH 1/4] ASoC: SOF: Intel: hda: Fold mlink enumeration into hda_dsp_ctrl_init_chip()

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

Move the hda_bus_ml_init() call from hda_init_caps() into
hda_dsp_ctrl_init_chip(), right after the HDA controller reset has
been de-asserted and unsolicited responses have been accepted.

hda_dsp_ctrl_init_chip() already calls hda_bus_ml_reset_losidv() at
the end of its sequence to clear the stream-to-link mapping. On first
boot this call was a no-op because the multi-link list had not yet
been populated: hda_bus_ml_init() only runs later in hda_init_caps().
Enumerating the links inside init_chip() makes the LOSIDV reset
effective on first boot as well, without adding a second reset call
from the probe path.

hda_bus_ml_init() now returns early when the hlink_list is already
populated, so the subsequent invocations from the D3 resume path
(hda_resume() -> hda_dsp_ctrl_init_chip(false)) are no-ops.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
---
 sound/soc/sof/intel/hda-ctrl.c  | 8 ++++++++
 sound/soc/sof/intel/hda-mlink.c | 4 ++++
 sound/soc/sof/intel/hda.c       | 2 --
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/intel/hda-ctrl.c b/sound/soc/sof/intel/hda-ctrl.c
index 8332d4bda558..a9ead78d3fcb 100644
--- a/sound/soc/sof/intel/hda-ctrl.c
+++ b/sound/soc/sof/intel/hda-ctrl.c
@@ -223,6 +223,14 @@ int hda_dsp_ctrl_init_chip(struct snd_sof_dev *sdev, bool detect_codec)
 	/* Accept unsolicited responses */
 	snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_UNSOL, AZX_GCTL_UNSOL);
 
+	/* Perform a one-time enumeration of the Multi-Link capability */
+	ret = hda_bus_ml_init(bus);
+	if (ret < 0) {
+		dev_err(sdev->dev, "%s: failed to enumerate multi-links\n",
+			__func__);
+		goto err;
+	}
+
 	if (detect_codec)
 		hda_codec_detect_mask(sdev);
 
diff --git a/sound/soc/sof/intel/hda-mlink.c b/sound/soc/sof/intel/hda-mlink.c
index 92314e3b568a..ca8551befdb5 100644
--- a/sound/soc/sof/intel/hda-mlink.c
+++ b/sound/soc/sof/intel/hda-mlink.c
@@ -432,6 +432,10 @@ int hda_bus_ml_init(struct hdac_bus *bus)
 	if (!bus->mlcap)
 		return 0;
 
+	/* Enumeration is a one time operation, skip if already done */
+	if (!list_empty(&bus->hlink_list))
+		return 0;
+
 	link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1;
 
 	dev_dbg(bus->dev, "HDAudio Multi-Link count: %d\n", link_count);
diff --git a/sound/soc/sof/intel/hda.c b/sound/soc/sof/intel/hda.c
index dc85903b8d46..26db0e46b827 100644
--- a/sound/soc/sof/intel/hda.c
+++ b/sound/soc/sof/intel/hda.c
@@ -625,8 +625,6 @@ static int hda_init_caps(struct snd_sof_dev *sdev)
 		return ret;
 	}
 
-	hda_bus_ml_init(bus);
-
 	/* Skip SoundWire if it is not supported */
 	if (!(interface_mask & BIT(SOF_DAI_INTEL_ALH)))
 		goto skip_soundwire;
-- 
2.55.0