ASoC: omap-mcbsp: Simplify the mcbsp_start/_stop function parameters

We either start/stop TX or RX, never both. Move the tx/rx direction
selection within the functions.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Tested-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/omap/mcbsp.c

@@ -637,8 +637,10 @@ void omap_mcbsp_free(struct omap_mcbsp *mcbsp)
  * If no transmitter or receiver is active prior calling, then sample-rate
  * generator and frame sync are started.
  */
-void omap_mcbsp_start(struct omap_mcbsp *mcbsp, int tx, int rx)
+void omap_mcbsp_start(struct omap_mcbsp *mcbsp, int stream)
 {
+	int tx = (stream == SNDRV_PCM_STREAM_PLAYBACK);
+	int rx = !tx;
 	int enable_srg = 0;
 	u16 w;
 
@@ -694,8 +696,10 @@ void omap_mcbsp_start(struct omap_mcbsp *mcbsp, int tx, int rx)
 	omap_mcbsp_dump_reg(mcbsp);
 }
 
-void omap_mcbsp_stop(struct omap_mcbsp *mcbsp, int tx, int rx)
+void omap_mcbsp_stop(struct omap_mcbsp *mcbsp, int stream)
 {
+	int tx = (stream == SNDRV_PCM_STREAM_PLAYBACK);
+	int rx = !tx;
 	int idle;
 	u16 w;
 

sound/soc/omap/mcbsp.h

@@ -339,8 +339,8 @@ u16 omap_mcbsp_get_rx_delay(struct omap_mcbsp *mcbsp);
 int omap_mcbsp_get_dma_op_mode(struct omap_mcbsp *mcbsp);
 int omap_mcbsp_request(struct omap_mcbsp *mcbsp);
 void omap_mcbsp_free(struct omap_mcbsp *mcbsp);
-void omap_mcbsp_start(struct omap_mcbsp *mcbsp, int tx, int rx);
-void omap_mcbsp_stop(struct omap_mcbsp *mcbsp, int tx, int rx);
+void omap_mcbsp_start(struct omap_mcbsp *mcbsp, int stream);
+void omap_mcbsp_stop(struct omap_mcbsp *mcbsp, int stream);
 
 /* McBSP functional clock source changing function */
 int omap2_mcbsp_set_clks_src(struct omap_mcbsp *mcbsp, u8 fck_src_id);

sound/soc/omap/omap-mcbsp.c

@@ -201,27 +201,26 @@ static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 				  struct snd_soc_dai *cpu_dai)
 {
 	struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
-	int err = 0, play = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
 
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		mcbsp->active++;
-		omap_mcbsp_start(mcbsp, play, !play);
+		omap_mcbsp_start(mcbsp, substream->stream);
 		break;
 
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
-		omap_mcbsp_stop(mcbsp, play, !play);
+		omap_mcbsp_stop(mcbsp, substream->stream);
 		mcbsp->active--;
 		break;
 	default:
-		err = -EINVAL;
+		return -EINVAL;
 	}
 
-	return err;
+	return 0;
 }
 
 static snd_pcm_sframes_t omap_mcbsp_dai_delay(