ASoC: SOF: Intel: hda-mlink: add helpers to enable/check interrupts

When INTC is set, LCTL exposes INTEN and INTSTS fields.
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/20230404104127.5629-12-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/hda-mlink.h

@@ -14,6 +14,8 @@ 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);
+void hdac_bus_eml_enable_interrupt(struct hdac_bus *bus, bool alt, int elid, bool enable);
+bool hdac_bus_eml_check_interrupt(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);
@@ -39,6 +41,12 @@ 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 void
+hdac_bus_eml_enable_interrupt(struct hdac_bus *bus, bool alt, int elid, bool enable) { }
+
+static inline bool
+hdac_bus_eml_check_interrupt(struct hdac_bus *bus, bool alt, int elid) { return false; }
+
 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

@@ -232,6 +232,28 @@ static int hdaml_link_shutdown(u32 __iomem *lctl, int sublink)
 	return check_sublink_power(lctl, sublink, false);
 }
 
+static void hdaml_link_enable_interrupt(u32 __iomem *lctl, bool enable)
+{
+	u32 val;
+
+	val = readl(lctl);
+	if (enable)
+		val |= AZX_ML_LCTL_INTEN;
+	else
+		val &= ~AZX_ML_LCTL_INTEN;
+
+	writel(val, lctl);
+}
+
+static bool hdaml_link_check_interrupt(u32 __iomem *lctl)
+{
+	u32 val;
+
+	val = readl(lctl);
+
+	return val & AZX_ML_LCTL_INTSTS;
+}
+
 /* END HDAML section */
 
 static int hda_ml_alloc_h2link(struct hdac_bus *bus, int index)
@@ -340,6 +362,46 @@ int hdac_bus_eml_get_count(struct hdac_bus *bus, bool alt, int elid)
 }
 EXPORT_SYMBOL_NS(hdac_bus_eml_get_count, SND_SOC_SOF_HDA_MLINK);
 
+void hdac_bus_eml_enable_interrupt(struct hdac_bus *bus, bool alt, int elid, bool enable)
+{
+	struct hdac_ext2_link *h2link;
+	struct hdac_ext_link *hlink;
+
+	h2link = find_ext2_link(bus, alt, elid);
+	if (!h2link)
+		return;
+
+	if (!h2link->intc)
+		return;
+
+	hlink = &h2link->hext_link;
+
+	mutex_lock(&h2link->eml_lock);
+
+	hdaml_link_enable_interrupt(hlink->ml_addr + AZX_REG_ML_LCTL, enable);
+
+	mutex_unlock(&h2link->eml_lock);
+}
+EXPORT_SYMBOL_NS(hdac_bus_eml_enable_interrupt, SND_SOC_SOF_HDA_MLINK);
+
+bool hdac_bus_eml_check_interrupt(struct hdac_bus *bus, bool alt, int elid)
+{
+	struct hdac_ext2_link *h2link;
+	struct hdac_ext_link *hlink;
+
+	h2link = find_ext2_link(bus, alt, elid);
+	if (!h2link)
+		return false;
+
+	if (!h2link->intc)
+		return false;
+
+	hlink = &h2link->hext_link;
+
+	return hdaml_link_check_interrupt(hlink->ml_addr + AZX_REG_ML_LCTL);
+}
+EXPORT_SYMBOL_NS(hdac_bus_eml_check_interrupt, 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)
 {