ASoC: rsnd: ssi: remove unnesessary period_pos

period_pos can always be calculated by byte_pos and
byte_per_period, there is no reason to maintain this
variable in rsnd_dai_stream.

This patch removes period_pos from rsnd_ssi and calculates
next_period_byte with consideration of actual byte_pos value.
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/ssi.c

@@ -80,7 +80,6 @@ struct rsnd_ssi {
 	unsigned int usrcnt;
 
 	int byte_pos;
-	int period_pos;
 	int byte_per_period;
 	int next_period_byte;
 };
@@ -421,7 +420,6 @@ static void rsnd_ssi_pointer_init(struct rsnd_mod *mod,
 	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 
 	ssi->byte_pos		= 0;
-	ssi->period_pos		= 0;
 	ssi->byte_per_period	= runtime->period_size *
 				  runtime->channels *
 				  samples_to_bytes(runtime, 1);
@@ -453,13 +451,12 @@ static bool rsnd_ssi_pointer_update(struct rsnd_mod *mod,
 
 	if (byte_pos >= ssi->next_period_byte) {
 		struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
+		int period_pos = byte_pos / ssi->byte_per_period;
 
-		ssi->period_pos++;
-		ssi->next_period_byte += ssi->byte_per_period;
+		ssi->next_period_byte = (period_pos + 1) * ssi->byte_per_period;
 
-		if (ssi->period_pos >= runtime->periods) {
+		if (period_pos >= runtime->periods) {
 			byte_pos = 0;
-			ssi->period_pos = 0;
 			ssi->next_period_byte = ssi->byte_per_period;
 		}