From: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
For SoundWire usages, we need to use the global eml_lock to
serialize/protect all accesses to shared registers. Due to the split
implementation across two subsystems, we need to pass a pointer
around.
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: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
---
include/sound/hda-mlink.h | 5 +++++
sound/soc/sof/intel/hda-mlink.c | 12 ++++++++++++
2 files changed, 17 insertions(+)
diff --git a/include/sound/hda-mlink.h b/include/sound/hda-mlink.h
index 17adb748597a..7b6ad0429034 100644
--- a/include/sound/hda-mlink.h
+++ b/include/sound/hda-mlink.h
@@ -52,6 +52,8 @@ int hda_bus_ml_suspend(struct hdac_bus *bus);
struct hdac_ext_link *hdac_bus_eml_ssp_get_hlink(struct hdac_bus *bus);
struct hdac_ext_link *hdac_bus_eml_dmic_get_hlink(struct hdac_bus *bus);
+struct mutex *hdac_bus_eml_get_mutex(struct hdac_bus *bus, bool alt, int elid);
+
int hdac_bus_eml_enable_offload(struct hdac_bus *bus, bool alt, int elid, bool enable);
#else
@@ -153,6 +155,9 @@ hdac_bus_eml_ssp_get_hlink(struct hdac_bus *bus) { return NULL; }
static inline struct hdac_ext_link *
hdac_bus_eml_dmic_get_hlink(struct hdac_bus *bus) { return NULL; }
+static inline struct mutex *
+hdac_bus_eml_get_mutex(struct hdac_bus *bus, bool alt, int elid) { return NULL; }
+
static inline int
hdac_bus_eml_enable_offload(struct hdac_bus *bus, bool alt, int elid, bool enable)
{
diff --git a/sound/soc/sof/intel/hda-mlink.c b/sound/soc/sof/intel/hda-mlink.c
index e38f00bd72ad..a3e5af7319ae 100644
--- a/sound/soc/sof/intel/hda-mlink.c
+++ b/sound/soc/sof/intel/hda-mlink.c
@@ -800,6 +800,18 @@ int hda_bus_ml_suspend(struct hdac_bus *bus)
}
EXPORT_SYMBOL_NS(hda_bus_ml_suspend, SND_SOC_SOF_HDA_MLINK);
+struct mutex *hdac_bus_eml_get_mutex(struct hdac_bus *bus, bool alt, int elid)
+{
+ struct hdac_ext2_link *h2link;
+
+ h2link = find_ext2_link(bus, alt, elid);
+ if (!h2link)
+ return NULL;
+
+ return &h2link->eml_lock;
+}
+EXPORT_SYMBOL_NS(hdac_bus_eml_get_mutex, SND_SOC_SOF_HDA_MLINK);
+
struct hdac_ext_link *hdac_bus_eml_ssp_get_hlink(struct hdac_bus *bus)
{
struct hdac_ext2_link *h2link;
--
2.40.0
