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ASoC/mpc5200: fix enable/disable of AC97 slots 

The MPC5200 AC97 driver is disabling the slots when a stop
trigger is received, but not reenabling them if the stream
is started again without processing the hw_params again.

This patch fixes the problem by caching the slot enable bit
settings calculated at hw_params time so that they can be
reapplied every time the start trigger is received.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Grant Likely 2009-11-07 01:34:43 -07:00 committed by Mark Brown
parent 1d8222e8df
commit c939e5c821
2 changed files with 26 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sound/soc/fsl/mpc5200_dma.h
View File

@ -16,6 +16,7 @@
* @period_end: physical address of end of DMA region * @period_end: physical address of end of DMA region
* @period_next_pt: physical address of next DMA buffer to enqueue * @period_next_pt: physical address of next DMA buffer to enqueue
* @period_bytes: size of DMA period in bytes * @period_bytes: size of DMA period in bytes
* @ac97_slot_bits: Enable bits for turning on the correct AC97 slot
*/ */
struct psc_dma_stream { struct psc_dma_stream {
struct snd_pcm_runtime *runtime; struct snd_pcm_runtime *runtime;
@ -28,6 +29,9 @@ struct psc_dma_stream {
int period_current; int period_current;
int period_bytes; int period_bytes;
int period_count; int period_count;
/* AC97 state */
u32 ac97_slot_bits;
}; };
/** /**

41
sound/soc/fsl/mpc5200_psc_ac97.c
View File

@ -130,6 +130,7 @@ static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai) struct snd_soc_dai *cpu_dai)
{ {
struct psc_dma *psc_dma = cpu_dai->private_data; struct psc_dma *psc_dma = cpu_dai->private_data;
struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
" periods=%i buffer_size=%i buffer_bytes=%i channels=%i" " periods=%i buffer_size=%i buffer_bytes=%i channels=%i"
@ -140,20 +141,10 @@ static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
params_channels(params), params_rate(params), params_channels(params), params_rate(params),
params_format(params)); params_format(params));
/* Determine the set of enable bits to turn on */
if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) { s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300;
if (params_channels(params) == 1) if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE)
psc_dma->slots |= 0x00000100; s->ac97_slot_bits <<= 16;
else
psc_dma->slots |= 0x00000300;
} else {
if (params_channels(params) == 1)
psc_dma->slots |= 0x01000000;
else
psc_dma->slots |= 0x03000000;
}
out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
return 0; return 0;
} }
@ -163,6 +154,8 @@ static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
{ {
struct psc_dma *psc_dma = cpu_dai->private_data; struct psc_dma *psc_dma = cpu_dai->private_data;
dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream);
if (params_channels(params) == 1) if (params_channels(params) == 1)
out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000); out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
else else
@ -176,14 +169,24 @@ static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
{ {
struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
switch (cmd) { switch (cmd) {
case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_START:
if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
psc_dma->slots &= 0xFFFF0000; substream->pstr->stream);
else
psc_dma->slots &= 0x0000FFFF;
/* Set the slot enable bits */
psc_dma->slots |= s->ac97_slot_bits;
out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
break;
case SNDRV_PCM_TRIGGER_STOP:
dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
substream->pstr->stream);
/* Clear the slot enable bits */
psc_dma->slots &= ~(s->ac97_slot_bits);
out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
break; break;
} }