diff options
| author | Alan Tull <r80115@freescale.com> | 2010-04-12 17:57:03 -0500 |
|---|---|---|
| committer | Alan Tull <r80115@freescale.com> | 2010-04-13 09:35:55 -0500 |
| commit | 976a44d4c493091490d685ebda49659f6e55e5b9 (patch) | |
| tree | 776dee04b1fbc6c70568255bcb649728322cc5c1 /sound | |
| parent | c57c13403aa0f3b64f2295c1f8ebe5adcb96d654 (diff) | |
ENGR00122462 mxs: support mmapped buffer for 24/32 bit spdif
Due to an apparent hw bug we have to shift data in the audio buffer by
one byte to play out S/PDIF. ENGR00122025 and ENGR00122231 are a
workaround for playback with non-mmapped buffers. This patch is
the workaround for mmapped buffers.
Signed-off-by: Alan Tull <r80115@freescale.com>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/mxs/mxs-pcm.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/sound/soc/mxs/mxs-pcm.c b/sound/soc/mxs/mxs-pcm.c index 965bbbadafea..a9f0358687f4 100644 --- a/sound/soc/mxs/mxs-pcm.c +++ b/sound/soc/mxs/mxs-pcm.c @@ -62,6 +62,7 @@ struct mxs_runtime_data { u32 dma_ch; u32 dma_period; u32 dma_totsize; + unsigned long appl_ptr_bytes; int format; struct mxs_pcm_dma_params *params; @@ -71,8 +72,11 @@ struct mxs_runtime_data { static irqreturn_t mxs_pcm_dma_irq(int irq, void *dev_id) { struct snd_pcm_substream *substream = dev_id; + struct snd_pcm_runtime *runtime = substream->runtime; struct mxs_runtime_data *prtd = substream->runtime->private_data; struct mxs_dma_info dma_info; + void *pdma; + unsigned long prev_appl_offset, appl_count, cont, appl_ptr_bytes; mxs_dma_get_info(prtd->dma_ch, &dma_info); @@ -81,6 +85,32 @@ static irqreturn_t mxs_pcm_dma_irq(int irq, void *dev_id) __func__, prtd->params->dma_ch, prtd->params->name); mxs_dma_ack_irq(prtd->dma_ch); } else { + if ((prtd->params->dma_ch == MXS_DMA_CHANNEL_AHB_APBX_SPDIF) && + (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) && + (runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) && + ((prtd->format == SNDRV_PCM_FORMAT_S24_LE) + || (prtd->format == SNDRV_PCM_FORMAT_S20_3LE))) { + + appl_ptr_bytes = + frames_to_bytes(runtime, + runtime->control->appl_ptr); + + appl_count = appl_ptr_bytes - prtd->appl_ptr_bytes; + prev_appl_offset = + prtd->appl_ptr_bytes % prtd->dma_totsize; + cont = prtd->dma_totsize - prev_appl_offset; + + if (appl_count > cont) { + pdma = runtime->dma_area + prev_appl_offset; + memmove(pdma + 1, pdma, cont - 1); + pdma = runtime->dma_area; + memmove(pdma + 1, pdma, appl_count - cont - 1); + } else { + pdma = runtime->dma_area + prev_appl_offset; + memmove(pdma + 1, pdma, appl_count - 1); + } + prtd->appl_ptr_bytes = appl_ptr_bytes; + } mxs_dma_ack_irq(prtd->dma_ch); snd_pcm_period_elapsed(substream); } @@ -168,11 +198,23 @@ static void mxs_pcm_stop(struct snd_pcm_substream *substream) static int mxs_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { + struct snd_pcm_runtime *runtime = substream->runtime; struct mxs_runtime_data *prtd = substream->runtime->private_data; int ret = 0; switch (cmd) { case SNDRV_PCM_TRIGGER_START: + if ((prtd->params->dma_ch == MXS_DMA_CHANNEL_AHB_APBX_SPDIF) && + (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) && + (runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) && + ((prtd->format == SNDRV_PCM_FORMAT_S24_LE) + || (prtd->format == SNDRV_PCM_FORMAT_S20_3LE))) { + prtd->appl_ptr_bytes = + frames_to_bytes(runtime, + runtime->control->appl_ptr); + memmove(runtime->dma_area + 1, runtime->dma_area, + prtd->appl_ptr_bytes - 1); + } mxs_dma_enable(prtd->dma_ch); break; |