OSS Audio L/R Channel Interchanges fix

@@ -28,6 +28,8 @@
  * 2004-11-01   Nishanth Menon  - 16xx platform code base modified to support multi channel chaining.
  *
  * 2004-12-15   Nishanth Menon  - Improved 16xx platform channel logic introduced - tasklets, queue handling updated
+ *
+ * 2005-12-10   Dirk Behme      - Added L/R Channel Interchange fix as proposed by Ajaya Babu
  */
 
 #include <linux/config.h>

@@ -730,8 +732,10 @@ static int audio_start_dma_chain(audio_s
 	int channel = s->lch[s->dma_q_head];
 	FN_IN;
 	if (!s->started) {
+	        s->hw_stop();            /* stops McBSP Interface */ 
 		omap_start_dma(channel);
 		s->started = 1;
+		s->hw_start();           /* start McBSP interface */ 
 	}
 	/* else the dma itself will progress forward with out our help */
 	FN_OUT(0);

@@ -111,16 +111,35 @@
 
 #define NUMBER_SAMPLE_RATES_SUPPORTED 9
 
+/*
+ * HW interface start and stop helper functions
+ */
+static int audio_ifc_start(void)
+{
+	omap_mcbsp_start(AUDIO_MCBSP); 
+	return 0;
+}
+
+static int audio_ifc_stop(void)
+{
+	omap_mcbsp_stop(AUDIO_MCBSP);
+	return 0;
+}
+
 static audio_stream_t output_stream = {
         .id              = "AIC23 out",
         .dma_dev         = OMAP_DMA_MCBSP1_TX,
-        .input_or_output = FMODE_WRITE
+        .input_or_output = FMODE_WRITE,
+        .hw_start        = audio_ifc_start,
+        .hw_stop         = audio_ifc_stop
 };
 
 static audio_stream_t input_stream = {
         .id              = "AIC23 in",
         .dma_dev         = OMAP_DMA_MCBSP1_RX,
-        .input_or_output = FMODE_READ
+        .input_or_output = FMODE_READ,
+        .hw_start        = audio_ifc_start,
+        .hw_stop         = audio_ifc_stop
 };
 
 static struct clk *aic23_mclk = 0;

@@ -20,6 +20,8 @@
  *  2004/08/12 Nishanth Menon - Modified to integrate Audio requirements on 1610,1710 platforms
  *
  *  2004/04/04 Nishanth menon - Added hooks for power management
+ *
+ *  2005/12/10 Dirk Behme     - Added L/R Channel Interchange fix as proposed by Ajaya Babu
  */
 
 #ifndef __OMAP_AUDIO_H

@@ -75,6 +77,8 @@ typedef struct {
 	unsigned stopped:1;	/* might be active but stopped */
 	unsigned spin_idle:1;	/* have DMA spin on zeros when idle */
 	unsigned linked:1;	/* dma channels linked */
+        int (*hw_start)(void);  /* interface to start HW interface, e.g. McBSP */
+        int (*hw_stop)(void);   /* interface to stop HW interface, e.g. McBSP */
 } audio_stream_t;
 
 /*