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[media] tw686x: audio: Implement non-memcpy capture

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Now that we've introduced the dma_mode parameter to pick the
DMA operation, let's use it to also select the audio DMA
operation.

When dma_mode != memcpy, the driver will avoid using memcpy
in the audio capture path, and the DMA hardware operation
will act directly on the ALSA buffers.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Ezequiel Garcia 2016-06-04 20:47:18 -03:00 committed by Mauro Carvalho Chehab
parent 34e2acc8df
commit c156c54d79
1 changed files with 28 additions and 4 deletions
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32
drivers/media/pci/tw686x/tw686x-audio.c
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@ -62,12 +62,22 @@ void tw686x_audio_irq(struct tw686x_dev *dev, unsigned long requests,
}
spin_unlock_irqrestore(&ac->lock, flags);
if (!done || !next)
continue;
/*
* Checking for a non-nil dma_desc[pb]->virt buffer is
* the same as checking for memcpy DMA mode.
*/
desc = &ac->dma_descs[pb];
if (done && next && desc->virt) {
memcpy(done->virt, desc->virt, desc->size);
ac->ptr = done->dma - ac->buf[0].dma;
snd_pcm_period_elapsed(ac->ss);
if (desc->virt) {
memcpy(done->virt, desc->virt,
desc->size);
} else {
u32 reg = pb ? ADMA_B_ADDR[ch] : ADMA_P_ADDR[ch];
reg_write(dev, reg, next->dma);
}
ac->ptr = done->dma - ac->buf[0].dma;
snd_pcm_period_elapsed(ac->ss);
}
}
@ -181,6 +191,12 @@ static int tw686x_pcm_prepare(struct snd_pcm_substream *ss)
ac->curr_bufs[0] = p_buf;
ac->curr_bufs[1] = b_buf;
ac->ptr = 0;
if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY) {
reg_write(dev, ADMA_P_ADDR[ac->ch], p_buf->dma);
reg_write(dev, ADMA_B_ADDR[ac->ch], b_buf->dma);
}
spin_unlock_irqrestore(&ac->lock, flags);
return 0;
@ -290,6 +306,14 @@ static int tw686x_audio_dma_alloc(struct tw686x_dev *dev,
{
int pb;
/*
* In the memcpy DMA mode we allocate a consistent buffer
* and use it for the DMA capture. Otherwise, DMA
* acts on the ALSA buffers as received in pcm_prepare.
*/
if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY)
return 0;
for (pb = 0; pb < 2; pb++) {
u32 reg = pb ? ADMA_B_ADDR[ac->ch] : ADMA_P_ADDR[ac->ch];
void *virt;