redonkable/remarkable-linux
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[ALSA] soc - Reinitialise DMA on every resume

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This one changes the DMA initialisation as it turns out the DMA driver
in s3c24xx doesnt store registers between suspend/resume so you have
to re-initialise the channels on every resume.

Signed-off-by: Graeme Gregory <graeme@openmoko.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Graeme Gregory 2008-01-10 14:44:24 +01:00 committed by Jaroslav Kysela
parent 2d6a4ac9ee
commit 96d90e1930
1 changed files with 25 additions and 23 deletions
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48
sound/soc/s3c24xx/s3c24xx-pcm.c
View file

@ -48,7 +48,9 @@ static const struct snd_pcm_hardware s3c24xx_pcm_hardware = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID,
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_PAUSE |
SNDRV_PCM_INFO_RESUME,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_U16_LE |
SNDRV_PCM_FMTBIT_U8 |
@ -175,28 +177,6 @@ static int s3c24xx_pcm_hw_params(struct snd_pcm_substream *substream,
}
}
/* channel needs configuring for mem=>device, increment memory addr,
* sync to pclk, half-word transfers to the IIS-FIFO. */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
s3c2410_dma_devconfig(prtd->params->channel,
S3C2410_DMASRC_MEM, S3C2410_DISRCC_INC |
S3C2410_DISRCC_APB, prtd->params->dma_addr);
s3c2410_dma_config(prtd->params->channel,
prtd->params->dma_size,
S3C2410_DCON_SYNC_PCLK |
S3C2410_DCON_HANDSHAKE);
} else {
s3c2410_dma_config(prtd->params->channel,
prtd->params->dma_size,
S3C2410_DCON_HANDSHAKE |
S3C2410_DCON_SYNC_PCLK);
s3c2410_dma_devconfig(prtd->params->channel,
S3C2410_DMASRC_HW, 0x3,
prtd->params->dma_addr);
}
s3c2410_dma_set_buffdone_fn(prtd->params->channel,
s3c24xx_audio_buffdone);
@ -245,6 +225,28 @@ static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
if (!prtd->params)
return 0;
/* channel needs configuring for mem=>device, increment memory addr,
* sync to pclk, half-word transfers to the IIS-FIFO. */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
s3c2410_dma_devconfig(prtd->params->channel,
S3C2410_DMASRC_MEM, S3C2410_DISRCC_INC |
S3C2410_DISRCC_APB, prtd->params->dma_addr);
s3c2410_dma_config(prtd->params->channel,
prtd->params->dma_size,
S3C2410_DCON_SYNC_PCLK |
S3C2410_DCON_HANDSHAKE);
} else {
s3c2410_dma_config(prtd->params->channel,
prtd->params->dma_size,
S3C2410_DCON_HANDSHAKE |
S3C2410_DCON_SYNC_PCLK);
s3c2410_dma_devconfig(prtd->params->channel,
S3C2410_DMASRC_HW, 0x3,
prtd->params->dma_addr);
}
/* flush the DMA channel */
s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
prtd->dma_loaded = 0;