ASoC: SOF: Intel: hda: remove misleading error trace from IRQ thread

Downgrade "nothing to do in IRQ thread" message from error to a debug
message in the IPC interrupt handler thread.

The spurious wake-up can happen if a HDA stream interrupt is
raised while the IPC interrupt thread is running. IPC functionality
is not impacted by this condition, so debug is a more appropriate
trace level.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190722141402.7194-21-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/cnl.c

@@ -101,8 +101,8 @@ static irqreturn_t cnl_ipc_irq_thread(int irq, void *context)
 		/*
 		 * This interrupt is not shared so no need to return IRQ_NONE.
 		 */
-		dev_err_ratelimited(sdev->dev,
+		dev_dbg_ratelimited(sdev->dev,
-				    "error: nothing to do in IRQ thread\n");
+				    "nothing to do in IPC IRQ thread\n");
 	}
 
 	/* re-enable IPC interrupt */

sound/soc/sof/intel/hda-ipc.c

@@ -224,8 +224,8 @@ irqreturn_t hda_dsp_ipc_irq_thread(int irq, void *context)
 		/*
 		 * This interrupt is not shared so no need to return IRQ_NONE.
 		 */
-		dev_err_ratelimited(sdev->dev,
+		dev_dbg_ratelimited(sdev->dev,
-				    "error: nothing to do in IRQ thread\n");
+				    "nothing to do in IPC IRQ thread\n");
 	}
 
 	/* re-enable IPC interrupt */