[PATCH v2 14/18] ASoC: SOF: Intel: hda-mlink: add helper to check cmdsync

[Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>]

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

This helper is an optimization where sync_go is only called when the
cmdsync field is actually set to a non-zero value.

Since this is also only used by SoundWire for now, only expose the
_unlocked version.

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       |  9 ++++++++
 sound/soc/sof/intel/hda-mlink.c | 38 +++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/include/sound/hda-mlink.h b/include/sound/hda-mlink.h
index 234af269495e..0c71b843f2cf 100644
--- a/include/sound/hda-mlink.h
+++ b/include/sound/hda-mlink.h
@@ -29,6 +29,9 @@ void hdac_bus_eml_sdw_sync_arm_unlocked(struct hdac_bus *bus, int sublink);
 int hdac_bus_eml_sync_go_unlocked(struct hdac_bus *bus, bool alt, int elid);
 int hdac_bus_eml_sdw_sync_go_unlocked(struct hdac_bus *bus);
 
+bool hdac_bus_eml_check_cmdsync_unlocked(struct hdac_bus *bus, bool alt, int elid);
+bool hdac_bus_eml_sdw_check_cmdsync_unlocked(struct hdac_bus *bus);
+
 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);
 
@@ -92,6 +95,12 @@ hdac_bus_eml_sync_go_unlocked(struct hdac_bus *bus, bool alt, int elid) { return
 static inline int
 hdac_bus_eml_sdw_sync_go_unlocked(struct hdac_bus *bus) { return 0; }
 
+static inline bool
+hdac_bus_eml_check_cmdsync_unlocked(struct hdac_bus *bus, bool alt, int elid) { return false; }
+
+static inline bool
+hdac_bus_eml_sdw_check_cmdsync_unlocked(struct hdac_bus *bus) { return false; }
+
 static inline int
 hdac_bus_eml_power_up(struct hdac_bus *bus, bool alt, int elid, int sublink)
 {
diff --git a/sound/soc/sof/intel/hda-mlink.c b/sound/soc/sof/intel/hda-mlink.c
index c8371ab03c0a..cbbc8639691c 100644
--- a/sound/soc/sof/intel/hda-mlink.c
+++ b/sound/soc/sof/intel/hda-mlink.c
@@ -314,6 +314,15 @@ static void hdaml_link_sync_go(u32 __iomem *lsync)
 	writel(val, lsync);
 }
 
+static bool hdaml_link_check_cmdsync(u32 __iomem *lsync, u32 cmdsync_mask)
+{
+	u32 val;
+
+	val = readl(lsync);
+
+	return !!(val & cmdsync_mask);
+}
+
 /* END HDAML section */
 
 static int hda_ml_alloc_h2link(struct hdac_bus *bus, int index)
@@ -562,6 +571,35 @@ int hdac_bus_eml_sdw_sync_go_unlocked(struct hdac_bus *bus)
 }
 EXPORT_SYMBOL_NS(hdac_bus_eml_sdw_sync_go_unlocked, SND_SOC_SOF_HDA_MLINK);
 
+bool hdac_bus_eml_check_cmdsync_unlocked(struct hdac_bus *bus, bool alt, int elid)
+{
+	struct hdac_ext2_link *h2link;
+	struct hdac_ext_link *hlink;
+	u32 cmdsync_mask;
+
+	h2link = find_ext2_link(bus, alt, elid);
+	if (!h2link)
+		return 0;
+
+	if (!h2link->lss)
+		return 0;
+
+	hlink = &h2link->hext_link;
+
+	cmdsync_mask = GENMASK(AZX_REG_ML_LSYNC_CMDSYNC_SHIFT + h2link->slcount - 1,
+			       AZX_REG_ML_LSYNC_CMDSYNC_SHIFT);
+
+	return hdaml_link_check_cmdsync(hlink->ml_addr + AZX_REG_ML_LSYNC,
+					cmdsync_mask);
+}
+EXPORT_SYMBOL_NS(hdac_bus_eml_check_cmdsync_unlocked, SND_SOC_SOF_HDA_MLINK);
+
+bool hdac_bus_eml_sdw_check_cmdsync_unlocked(struct hdac_bus *bus)
+{
+	return hdac_bus_eml_check_cmdsync_unlocked(bus, true, AZX_REG_ML_LEPTR_ID_SDW);
+}
+EXPORT_SYMBOL_NS(hdac_bus_eml_sdw_check_cmdsync_unlocked, 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)
 {
-- 
2.40.0