[7/9] soundwire: intel/cadence: merge Soundwire interrupt handlers/threads

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index 613dbd415b91..24eafe0aa1c3 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -17,6 +17,7 @@ 
 #include <linux/soundwire/sdw.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
+#include <linux/workqueue.h>
 #include "bus.h"
 #include "cadence_master.h"
 
@@ -790,7 +791,7 @@  irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 			     CDNS_MCP_INT_SLAVE_MASK, 0);
 
 		int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
-		ret = IRQ_WAKE_THREAD;
+		schedule_work(&cdns->work);
 	}
 
 	cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
@@ -799,13 +800,15 @@  irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 EXPORT_SYMBOL(sdw_cdns_irq);
 
 /**
- * sdw_cdns_thread() - Cadence irq thread handler
- * @irq: irq number
- * @dev_id: irq context
+ * To update slave status in a work since we will need to handle
+ * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
+ * process.
+ * @work: cdns worker thread
  */
-irqreturn_t sdw_cdns_thread(int irq, void *dev_id)
+static void cdns_update_slave_status_work(struct work_struct *work)
 {
-	struct sdw_cdns *cdns = dev_id;
+	struct sdw_cdns *cdns =
+		container_of(work, struct sdw_cdns, work);
 	u32 slave0, slave1;
 
 	dev_dbg_ratelimited(cdns->dev, "Slave status change\n");
@@ -822,9 +825,7 @@  irqreturn_t sdw_cdns_thread(int irq, void *dev_id)
 	cdns_updatel(cdns, CDNS_MCP_INTMASK,
 		     CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
 
-	return IRQ_HANDLED;
 }
-EXPORT_SYMBOL(sdw_cdns_thread);
 
 /*
  * init routines
@@ -1427,6 +1428,7 @@  int sdw_cdns_probe(struct sdw_cdns *cdns)
 	init_completion(&cdns->tx_complete);
 	cdns->bus.port_ops = &cdns_port_ops;
 
+	INIT_WORK(&cdns->work, cdns_update_slave_status_work);
 	return 0;
 }
 EXPORT_SYMBOL(sdw_cdns_probe);
diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h
index b410656f8194..7638858397df 100644
--- a/drivers/soundwire/cadence_master.h
+++ b/drivers/soundwire/cadence_master.h
@@ -129,6 +129,10 @@  struct sdw_cdns {
 
 	bool link_up;
 	unsigned int msg_count;
+
+	struct work_struct work;
+
+	struct list_head list;
 };
 
 #define bus_to_cdns(_bus) container_of(_bus, struct sdw_cdns, bus)
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 0a4fc7f65743..06c553d94890 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1258,21 +1258,7 @@  static int intel_master_probe(struct platform_device *pdev)
 			 "SoundWire master %d is disabled, will be ignored\n",
 			 bus->link_id);
 
-	/* Acquire IRQ */
-	ret = request_threaded_irq(sdw->link_res->irq,
-				   sdw_cdns_irq, sdw_cdns_thread,
-				   IRQF_SHARED, KBUILD_MODNAME, cdns);
-	if (ret < 0) {
-		dev_err(dev, "unable to grab IRQ %d, disabling device\n",
-			sdw->link_res->irq);
-		goto err_init;
-	}
-
 	return 0;
-
-err_init:
-	sdw_bus_master_delete(bus);
-	return ret;
 }
 
 int intel_master_startup(struct platform_device *pdev)
@@ -1344,7 +1330,6 @@  static int intel_master_remove(struct platform_device *pdev)
 	if (!bus->prop.hw_disabled) {
 		intel_debugfs_exit(sdw);
 		sdw_cdns_enable_interrupt(cdns, false);
-		free_irq(sdw->link_res->irq, sdw);
 		snd_soc_unregister_component(dev);
 	}
 	sdw_bus_master_delete(bus);
diff --git a/drivers/soundwire/intel.h b/drivers/soundwire/intel.h
index d6bdd4d63e08..bf127c88eb51 100644
--- a/drivers/soundwire/intel.h
+++ b/drivers/soundwire/intel.h
@@ -17,6 +17,8 @@ 
  * @dev: device implementing hw_params and free callbacks
  * @shim_lock: mutex to handle access to shared SHIM registers
  * @shim_mask: global pointer to check SHIM register initialization
+ * @cdns: Cadence master descriptor
+ * @list: used to walk-through all masters exposed by the same controller
  */
 struct sdw_intel_link_res {
 	struct platform_device *pdev;
@@ -29,6 +31,8 @@  struct sdw_intel_link_res {
 	struct device *dev;
 	struct mutex *shim_lock; /* protect shared registers */
 	u32 *shim_mask;
+	struct sdw_cdns *cdns;
+	struct list_head list;
 };
 
 struct sdw_intel {
diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c
index ad3175272e88..63b3beda443d 100644
--- a/drivers/soundwire/intel_init.c
+++ b/drivers/soundwire/intel_init.c
@@ -9,6 +9,7 @@ 
 
 #include <linux/acpi.h>
 #include <linux/export.h>
+#include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
@@ -166,6 +167,19 @@  void sdw_intel_enable_irq(void __iomem *mmio_base, bool enable)
 }
 EXPORT_SYMBOL_NS(sdw_intel_enable_irq, SOUNDWIRE_INTEL_INIT);
 
+irqreturn_t sdw_intel_thread(int irq, void *dev_id)
+{
+	struct sdw_intel_ctx *ctx = dev_id;
+	struct sdw_intel_link_res *link;
+
+	list_for_each_entry(link, &ctx->link_list, list)
+		sdw_cdns_irq(irq, link->cdns);
+
+	sdw_intel_enable_irq(ctx->mmio_base, true);
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(sdw_intel_thread);
+
 static struct sdw_intel_ctx
 *sdw_intel_probe_controller(struct sdw_intel_res *res)
 {
@@ -209,6 +223,8 @@  static struct sdw_intel_ctx
 	link = ctx->links;
 	link_mask = ctx->link_mask;
 
+	INIT_LIST_HEAD(&ctx->link_list);
+
 	/* Create SDW Master devices */
 	for (i = 0; i < count; i++, link++) {
 		if (!(link_mask & BIT(i))) {
@@ -246,6 +262,9 @@  static struct sdw_intel_ctx
 			goto err;
 		}
 		link->pdev = pdev;
+		link->cdns = platform_get_drvdata(pdev);
+
+		list_add_tail(&link->list, &ctx->link_list);
 	}
 
 	return ctx;