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[media] tw686x: audio: Allow to configure the period size
Currently, the driver has a fixed period size of 4096 bytes (2048 frames). Since this hardware can configure the audio capture size, this commit allows a period size range of [512-4096]. This is very useful to reduce the audio latency. 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
Mauro Carvalho Chehab
parent
c156c54d79
commit
447d7c3291
@ -71,7 +71,7 @@ void tw686x_audio_irq(struct tw686x_dev *dev, unsigned long requests,
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desc = &ac->dma_descs[pb];
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if (desc->virt) {
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memcpy(done->virt, desc->virt,
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desc->size);
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dev->period_size);
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} else {
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u32 reg = pb ? ADMA_B_ADDR[ch] : ADMA_P_ADDR[ch];
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reg_write(dev, reg, next->dma);
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@ -93,10 +93,11 @@ static int tw686x_pcm_hw_free(struct snd_pcm_substream *ss)
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}
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/*
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* The audio device rate is global and shared among all
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* Audio parameters are global and shared among all
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* capture channels. The driver makes no effort to prevent
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* rate modifications. User is free change the rate, but it
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* means changing the rate for all capture sub-devices.
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* any modifications. User is free change the audio rate,
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* or period size, thus changing parameters for all capture
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* sub-devices.
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*/
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static const struct snd_pcm_hardware tw686x_capture_hw = {
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.info = (SNDRV_PCM_INFO_MMAP |
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@ -109,9 +110,9 @@ static const struct snd_pcm_hardware tw686x_capture_hw = {
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.rate_max = 48000,
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.channels_min = 1,
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.channels_max = 1,
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.buffer_bytes_max = TW686X_AUDIO_PAGE_MAX * TW686X_AUDIO_PAGE_SZ,
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.period_bytes_min = TW686X_AUDIO_PAGE_SZ,
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.period_bytes_max = TW686X_AUDIO_PAGE_SZ,
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.buffer_bytes_max = TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,
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.period_bytes_min = AUDIO_DMA_SIZE_MIN,
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.period_bytes_max = AUDIO_DMA_SIZE_MAX,
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.periods_min = TW686X_AUDIO_PERIODS_MIN,
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.periods_max = TW686X_AUDIO_PERIODS_MAX,
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};
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@ -166,12 +167,21 @@ static int tw686x_pcm_prepare(struct snd_pcm_substream *ss)
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reg_write(dev, AUDIO_CONTROL2, reg);
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}
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if (period_size != TW686X_AUDIO_PAGE_SZ ||
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rt->periods < TW686X_AUDIO_PERIODS_MIN ||
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rt->periods > TW686X_AUDIO_PERIODS_MAX) {
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return -EINVAL;
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if (dev->period_size != period_size) {
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u32 reg;
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dev->period_size = period_size;
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reg = reg_read(dev, AUDIO_CONTROL1);
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reg &= ~(AUDIO_DMA_SIZE_MASK << AUDIO_DMA_SIZE_SHIFT);
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reg |= period_size << AUDIO_DMA_SIZE_SHIFT;
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reg_write(dev, AUDIO_CONTROL1, reg);
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}
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if (rt->periods < TW686X_AUDIO_PERIODS_MIN ||
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rt->periods > TW686X_AUDIO_PERIODS_MAX)
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return -EINVAL;
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spin_lock_irqsave(&ac->lock, flags);
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INIT_LIST_HEAD(&ac->buf_list);
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@ -282,8 +292,8 @@ static int tw686x_snd_pcm_init(struct tw686x_dev *dev)
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return snd_pcm_lib_preallocate_pages_for_all(pcm,
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SNDRV_DMA_TYPE_DEV,
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snd_dma_pci_data(dev->pci_dev),
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TW686X_AUDIO_PAGE_MAX * TW686X_AUDIO_PAGE_SZ,
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TW686X_AUDIO_PAGE_MAX * TW686X_AUDIO_PAGE_SZ);
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TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,
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TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX);
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}
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static void tw686x_audio_dma_free(struct tw686x_dev *dev,
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@ -318,7 +328,7 @@ static int tw686x_audio_dma_alloc(struct tw686x_dev *dev,
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u32 reg = pb ? ADMA_B_ADDR[ac->ch] : ADMA_P_ADDR[ac->ch];
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void *virt;
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virt = pci_alloc_consistent(dev->pci_dev, TW686X_AUDIO_PAGE_SZ,
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virt = pci_alloc_consistent(dev->pci_dev, AUDIO_DMA_SIZE_MAX,
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&ac->dma_descs[pb].phys);
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if (!virt) {
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dev_err(&dev->pci_dev->dev,
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@ -327,7 +337,7 @@ static int tw686x_audio_dma_alloc(struct tw686x_dev *dev,
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return -ENOMEM;
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}
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ac->dma_descs[pb].virt = virt;
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ac->dma_descs[pb].size = TW686X_AUDIO_PAGE_SZ;
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ac->dma_descs[pb].size = AUDIO_DMA_SIZE_MAX;
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reg_write(dev, reg, ac->dma_descs[pb].phys);
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}
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return 0;
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@ -358,12 +368,8 @@ int tw686x_audio_init(struct tw686x_dev *dev)
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struct snd_card *card;
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int err, ch;
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/*
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* AUDIO_CONTROL1
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* DMA byte length [31:19] = 4096 (i.e. ALSA period)
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* External audio enable [0] = enabled
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*/
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reg_write(dev, AUDIO_CONTROL1, 0x80000001);
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/* Enable external audio */
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reg_write(dev, AUDIO_CONTROL1, BIT(0));
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err = snd_card_new(&pci_dev->dev, SNDRV_DEFAULT_IDX1,
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SNDRV_DEFAULT_STR1,
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@ -105,6 +105,10 @@
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0x2d0, 0x2d1, 0x2d2, 0x2d3 })
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#define SYS_MODE_DMA_SHIFT 13
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#define AUDIO_DMA_SIZE_SHIFT 19
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#define AUDIO_DMA_SIZE_MIN SZ_512
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#define AUDIO_DMA_SIZE_MAX SZ_4K
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#define AUDIO_DMA_SIZE_MASK (SZ_8K - 1)
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#define DMA_CMD_ENABLE BIT(31)
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#define INT_STATUS_DMA_TOUT BIT(17)
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@ -27,7 +27,6 @@
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#define TYPE_SECOND_GEN 0x10
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#define TW686X_DEF_PHASE_REF 0x1518
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#define TW686X_AUDIO_PAGE_SZ 4096
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#define TW686X_AUDIO_PAGE_MAX 16
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#define TW686X_AUDIO_PERIODS_MIN 2
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#define TW686X_AUDIO_PERIODS_MAX TW686X_AUDIO_PAGE_MAX
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@ -139,7 +138,9 @@ struct tw686x_dev {
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struct tw686x_video_channel *video_channels;
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struct tw686x_audio_channel *audio_channels;
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int audio_rate; /* per-device value */
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/* Per-device audio parameters */
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int audio_rate;
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int period_size;
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struct timer_list dma_delay_timer;
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u32 pending_dma_en; /* must be protected by lock */
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