Re: ALSA with OMAP1510

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

>You should use "aplay test.raw" to play using alsa stack.
>  
>
Yes, for alsa driver the "aplay" should be the easiest solution.
I have myself used alsa succesfully with the tsc2101 chipset and latest
kernel in git repository (about 2.6.16-rc5)
by applying the 3 patches I and daniel send for the list about 10 days ago.

Daniel tested the tsc2101 and aic23 drivers by using OSK and H2 boards.
I used myself omap1510 based h6300 for writing and testing. With that
board there were two issues compared to other devices that I needed to
handle.

1) I needed to add following to audio_process_dma() in
sound/arm/omap_alsa.c that was was not needed by other boards.
    Without this, the dma stopped after first small buffer transfered.
If you have problems you could enable that also for your boards.

#ifdef CONFIG_MACH_OMAP_H6300
        spin_lock_irqsave(&s->dma_lock, flags);
        omap_stop_alsa_sound_dma(s);
        spin_unlock_irqrestore(&s->dma_lock, flags);
#endif

2) In sound/arm/omap/omap-alsa-tsc2101.c tsc2101_snd_omap_alsa_playback
structure h6300 needs to be configured to have 8 bit dma.
(this is not yet in the patch sent to the list)

#ifdef CONFIG_MACH_OMAP_H6300
    .formats = (SNDRV_PCM_FMTBIT_S8),
#else
    .formats = (SNDRV_PCM_FMTBIT_S16_LE),
#endif

If you want to test the play with different samplerates, you can use a
program called "sox" for creating wavs with different samplerates.
(sox song.wav -r 8000 -c 1  -s -w song8000.wav)
**
Mika