ASoC: SOF: Intel: hda-mlink: add helper to return sublink count

This is needed for SoundWire integration.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20230404104127.5629-11-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/hda-mlink.h

@@ -13,6 +13,8 @@ struct hdac_bus;
 int hda_bus_ml_init(struct hdac_bus *bus);
 void hda_bus_ml_free(struct hdac_bus *bus);
 
+int hdac_bus_eml_get_count(struct hdac_bus *bus, bool alt, int elid);
+
 int hdac_bus_eml_power_up(struct hdac_bus *bus, bool alt, int elid, int sublink);
 int hdac_bus_eml_power_up_unlocked(struct hdac_bus *bus, bool alt, int elid, int sublink);
 
@@ -34,6 +36,9 @@ hda_bus_ml_init(struct hdac_bus *bus) { return 0; }
 
 static inline void hda_bus_ml_free(struct hdac_bus *bus) { }
 
+static inline int
+hdac_bus_eml_get_count(struct hdac_bus *bus, bool alt, int elid) { return 0; }
+
 static inline int
 hdac_bus_eml_power_up(struct hdac_bus *bus, bool alt, int elid, int sublink)
 {

sound/soc/sof/intel/hda-mlink.c

@@ -328,6 +328,18 @@ find_ext2_link(struct hdac_bus *bus, bool alt, int elid)
 	return NULL;
 }
 
+int hdac_bus_eml_get_count(struct hdac_bus *bus, bool alt, int elid)
+{
+	struct hdac_ext2_link *h2link;
+
+	h2link = find_ext2_link(bus, alt, elid);
+	if (!h2link)
+		return 0;
+
+	return h2link->slcount;
+}
+EXPORT_SYMBOL_NS(hdac_bus_eml_get_count, SND_SOC_SOF_HDA_MLINK);
+
 static int hdac_bus_eml_power_up_base(struct hdac_bus *bus, bool alt, int elid, int sublink,
 				      bool eml_lock)
 {