Re: omap alsa tsc2101 driver

[lamikr <lamikr@cc.jyu.fi>]

I got my driver version working also with h6300/1510! But the solution
is not perfect and I do not yet understand why it helped.
I did not made any changes to audio_dma_get_pos() method. Instead I just
added dma_close to audio_process_dma() method
before each dma_start call and that forces the DMA to somehow trigger
irq_handler more oftern.

*diff -Naur h6300_dev_old/sound/arm/omap/omap-alsa-tsc2101.c h6300_dev_working/sound/arm/omap/omap-alsa-tsc2101.c*
*--- h6300_dev_old/sound/arm/omap/omap-alsa-tsc2101.c	2006-02-06 15:36:21.000000000 +0200*
*+++ h6300_dev_working/sound/arm/omap/omap-alsa-tsc2101.c	2006-02-08 14:37:27.000000000 +0200*
@@ -508,6 +508,7 @@
 	int period;
 	unsigned int dma_size;
 	unsigned int offset;
+	unsigned long flags;
 	int ret;
 
 	runtime = substream->runtime;
@@ -528,6 +529,11 @@
 			runtime->frame_bits,
 			runtime->dma_addr,
 			(dma_addr_t)runtime->dma_area + offset);
+#ifdef CONFIG_MACH_OMAP_H6300
+		spin_lock_irqsave(&s->dma_lock, flags);
+		omap_alsa_audio_stop_dma(s);
+		spin_unlock_irqrestore(&s->dma_lock, flags);
+#endif
 		ret	= omap_start_alsa_sound_dma(s,
 						 (dma_addr_t)runtime->dma_area + offset, 
 						 dma_size);

Now I need to figure out why this fixed the problem and what would be a
smarter solution for this.
In addition I can hear that 41000 hz sound is still not played with full
speed. (Maybe 1/2 speed is more correct...)

Mika