[DNM] soundwire: intel_init: re-try to handle interrupts

Test the theory that some links can report an interrupt that is lost
if reported *after* the link is handled.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

drivers/soundwire/intel_init.c

@@ -143,9 +143,25 @@ irqreturn_t sdw_intel_thread(int irq, void *dev_id)
 {
 	struct sdw_intel_ctx *ctx = dev_id;
 	struct sdw_intel_link_res *link;
+	irqreturn_t ret;
+	int count = 0;
 
-	list_for_each_entry(link, &ctx->link_list, list)
-		sdw_cdns_irq(irq, link->cdns);
+	list_for_each_entry(link, &ctx->link_list, list) {
+		ret = sdw_cdns_irq(irq, link->cdns);
+		if (ret == IRQ_HANDLED)
+			count++;
+	}
+
+	if (!count)
+		pr_err("%s: SoundWire interrupt signaled but nothing to handle\n",
+		       __func__);
+
+	/* attempt a second pass */
+	list_for_each_entry(link, &ctx->link_list, list) {
+		ret = sdw_cdns_irq(irq, link->cdns);
+		if (ret == IRQ_HANDLED)
+			dev_err(link->cdns->dev, "New SoundWire interrupt signaled in 2nd pass!!\n");
+	}
 
 	return IRQ_HANDLED;
 }