ASoC: SOF: Intel: hda-mlink: add convenience helpers for SoundWire PM

The updated SoundWire Intel driver will need to rely on Extended
HDaudio links for power management, but it doesn't need to be aware of
all the HDaudio structures. Add convenience helpers to avoid polluting
SoundWire drivers too much with HDaudio information.

Since the SoundWire/Intel solution already takes the lock at a higher
level, the _unlocked PM helpers are used.
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/20230404104127.5629-10-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/hda-mlink.h

@@ -19,6 +19,9 @@ int hdac_bus_eml_power_up_unlocked(struct hdac_bus *bus, bool alt, int elid, int
 int hdac_bus_eml_power_down(struct hdac_bus *bus, bool alt, int elid, int sublink);
 int hdac_bus_eml_power_down_unlocked(struct hdac_bus *bus, bool alt, int elid, int sublink);
 
+int hdac_bus_eml_sdw_power_up_unlocked(struct hdac_bus *bus, int sublink);
+int hdac_bus_eml_sdw_power_down_unlocked(struct hdac_bus *bus, int sublink);
+
 void hda_bus_ml_put_all(struct hdac_bus *bus);
 void hda_bus_ml_reset_losidv(struct hdac_bus *bus);
 int hda_bus_ml_resume(struct hdac_bus *bus);
@@ -55,6 +58,12 @@ hdac_bus_eml_power_down_unlocked(struct hdac_bus *bus, bool alt, int elid, int s
 	return 0;
 }
 
+static inline int
+hdac_bus_eml_sdw_power_up_unlocked(struct hdac_bus *bus, int sublink) { return 0; }
+
+static inline int
+hdac_bus_eml_sdw_power_down_unlocked(struct hdac_bus *bus, int sublink) { return 0; }
+
 static inline void hda_bus_ml_put_all(struct hdac_bus *bus) { }
 static inline void hda_bus_ml_reset_losidv(struct hdac_bus *bus) { }
 static inline int hda_bus_ml_resume(struct hdac_bus *bus) { return 0; }

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

@@ -414,6 +414,18 @@ int hdac_bus_eml_power_down_unlocked(struct hdac_bus *bus, bool alt, int elid, i
 }
 EXPORT_SYMBOL_NS(hdac_bus_eml_power_down_unlocked, SND_SOC_SOF_HDA_MLINK);
 
+int hdac_bus_eml_sdw_power_up_unlocked(struct hdac_bus *bus, int sublink)
+{
+	return hdac_bus_eml_power_up_unlocked(bus, true, AZX_REG_ML_LEPTR_ID_SDW, sublink);
+}
+EXPORT_SYMBOL_NS(hdac_bus_eml_sdw_power_up_unlocked, SND_SOC_SOF_HDA_MLINK);
+
+int hdac_bus_eml_sdw_power_down_unlocked(struct hdac_bus *bus, int sublink)
+{
+	return hdac_bus_eml_power_down_unlocked(bus, true, AZX_REG_ML_LEPTR_ID_SDW, sublink);
+}
+EXPORT_SYMBOL_NS(hdac_bus_eml_sdw_power_down_unlocked, SND_SOC_SOF_HDA_MLINK);
+
 void hda_bus_ml_put_all(struct hdac_bus *bus)
 {
 	struct hdac_ext_link *hlink;