ASoC: renesas: msiof: ignore 1st FSERR

Renesas have tried to minimize the occurrence of FSERR errors as much as
possible, but unfortunately we cannot remove them completely, because
MSIOF might setup its register during CLK/SYNC are inputed. It can be
happen because MSIOF is working as Clock/Frame Consumer.

Ignore 1st FSERR which we can do nothing

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Yusuke Goda <yusuke.goda.sx@renesas.com>
Link: https://patch.msgid.link/874isryutg.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: morimoto

sound/soc/renesas/rcar/msiof.c

@@ -65,6 +65,16 @@
  * how Codec driver start it.
  */
 
+/*
+ * [NOTE-FSERR]
+ *
+ * We can't remove all FSERR.
+ *
+ * Renesas have tried to minimize the occurrence of FSERR errors as much as possible, but
+ * unfortunately we cannot remove them completely, because MSIOF might setup its register during
+ * CLK/SYNC are inputed. It can be happen because MSIOF is working as Clock/Frame Consumer.
+ */
+
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_dma.h>
@@ -186,8 +196,13 @@ static int msiof_hw_start(struct snd_soc_component *component,
 
 	priv->count++;
 
-	/* reset errors */
-	priv->err_syc[substream->stream] =
+	/*
+	 * Reset errors. ignore 1st FSERR
+	 *
+	 * see
+	 *	[NOTE-FSERR]
+	 */
+	priv->err_syc[substream->stream] = -1;
 	priv->err_ovf[substream->stream] =
 	priv->err_udf[substream->stream] = 0;
 
@@ -279,6 +294,15 @@ static int msiof_hw_stop(struct snd_soc_component *component,
 	/* Stop DMAC */
 	snd_dmaengine_pcm_trigger(substream, cmd);
 
+	/*
+	 * Ignore 1st FSERR
+	 *
+	 * see
+	 *	[NOTE-FSERR]
+	 */
+	if (priv->err_syc[substream->stream] < 0)
+		priv->err_syc[substream->stream] = 0;
+
 	/* indicate error status if exist */
 	if (priv->err_syc[substream->stream] ||
 	    priv->err_ovf[substream->stream] ||