Make cpu power down IDC blocking

src/arch/xtensa/lib/cpu.c

@@ -113,7 +113,7 @@ void arch_cpu_disable_core(int id)
 		IDC_MSG_POWER_DOWN, IDC_MSG_POWER_DOWN_EXT, id };
 
 	if (arch_cpu_is_core_enabled(id)) {
-		idc_send_msg(&power_down, IDC_NON_BLOCKING);
+		idc_send_msg(&power_down, IDC_POWER_DOWN);
 
 		active_cores_mask ^= (1 << id);
 #if CONFIG_NO_SECONDARY_CORE_ROM

src/drivers/intel/cavs/idc.c

@@ -95,6 +95,16 @@ static bool idc_is_powered_up(int target_core)
 		TRACE_BOOT_PLATFORM;
 }
 
+/**
+ * \brief Checks core status register.
+ * \param[in] target_core Id of the core powering up.
+ * \return True if core powered up, false otherwise.
+ */
+static bool idc_is_powered_down(int target_core)
+{
+	return mailbox_sw_reg_read(PLATFORM_TRACEP_SECONDARY_CORE(target_core)) == 0;
+}
+
 /**
  * \brief Sends IDC message.
  * \param[in,out] msg Pointer to IDC message.
@@ -150,6 +160,14 @@ int idc_send_msg(struct idc_msg *msg, uint32_t mode)
 			       mailbox_sw_reg_read(PLATFORM_TRACEP_SECONDARY_CORE(msg->core)));
 		}
 		break;
+	case IDC_POWER_DOWN:
+		ret = idc_wait_in_blocking_mode(msg->core, idc_is_powered_down);
+		if (ret < 0) {
+			tr_err(&idc_tr, "idc_send_msg(), power down core %d failed, reason 0x%x",
+			       msg->core,
+			       mailbox_sw_reg_read(PLATFORM_TRACEP_SECONDARY_CORE(msg->core)));
+		}
+		break;
 	}
 
 	return ret;

src/include/sof/drivers/idc.h

@@ -30,6 +30,9 @@
 /** \brief IDC send core power up flag. */
 #define IDC_POWER_UP		2
 
+/** \brief IDC send core power down flag. */
+#define IDC_POWER_DOWN		3
+
 /** \brief IDC send timeout in microseconds. */
 #define IDC_TIMEOUT	10000