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@@ -41,10 +41,33 @@ static unsigned int dw_pcm_tx_##sample_bits(struct dw_i2s_dev *dev, \
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return tx_ptr; \
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}
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+#define dw_pcm_rx_fn(sample_bits) \
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+static unsigned int dw_pcm_rx_##sample_bits(struct dw_i2s_dev *dev, \
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+ struct snd_pcm_runtime *runtime, unsigned int rx_ptr, \
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+ bool *period_elapsed) \
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+{ \
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+ u##sample_bits (*p)[2] = (void *)runtime->dma_area; \
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+ unsigned int period_pos = rx_ptr % runtime->period_size; \
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+ int i; \
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+\
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+ for (i = 0; i < dev->fifo_th; i++) { \
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+ p[rx_ptr][0] = ioread32(dev->i2s_base + LRBR_LTHR(0)); \
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+ p[rx_ptr][1] = ioread32(dev->i2s_base + RRBR_RTHR(0)); \
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+ period_pos++; \
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+ if (++rx_ptr >= runtime->buffer_size) \
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+ rx_ptr = 0; \
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+ } \
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+ *period_elapsed = period_pos >= runtime->period_size; \
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+ return rx_ptr; \
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+}
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+
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dw_pcm_tx_fn(16);
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dw_pcm_tx_fn(32);
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+dw_pcm_rx_fn(16);
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+dw_pcm_rx_fn(32);
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#undef dw_pcm_tx_fn
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+#undef dw_pcm_rx_fn
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static const struct snd_pcm_hardware dw_pcm_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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@@ -57,6 +80,7 @@ static const struct snd_pcm_hardware dw_pcm_hardware = {
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.rate_min = 32000,
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.rate_max = 48000,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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+ SNDRV_PCM_FMTBIT_S24_LE |
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SNDRV_PCM_FMTBIT_S32_LE,
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.channels_min = 2,
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.channels_max = 2,
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@@ -68,27 +92,51 @@ static const struct snd_pcm_hardware dw_pcm_hardware = {
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.fifo_size = 16,
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};
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-void dw_pcm_push_tx(struct dw_i2s_dev *dev)
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+static void dw_pcm_transfer(struct dw_i2s_dev *dev, bool push)
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{
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- struct snd_pcm_substream *tx_substream;
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- bool tx_active, period_elapsed;
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+ struct snd_pcm_substream *substream;
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+ bool active, period_elapsed;
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rcu_read_lock();
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- tx_substream = rcu_dereference(dev->tx_substream);
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- tx_active = tx_substream && snd_pcm_running(tx_substream);
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- if (tx_active) {
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- unsigned int tx_ptr = READ_ONCE(dev->tx_ptr);
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- unsigned int new_tx_ptr = dev->tx_fn(dev, tx_substream->runtime,
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- tx_ptr, &period_elapsed);
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- cmpxchg(&dev->tx_ptr, tx_ptr, new_tx_ptr);
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+ if (push)
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+ substream = rcu_dereference(dev->tx_substream);
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+ else
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+ substream = rcu_dereference(dev->rx_substream);
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+ active = substream && snd_pcm_running(substream);
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+ if (active) {
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+ unsigned int ptr;
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+ unsigned int new_ptr;
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+
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+ if (push) {
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+ ptr = READ_ONCE(dev->tx_ptr);
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+ new_ptr = dev->tx_fn(dev, substream->runtime, ptr,
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+ &period_elapsed);
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+ cmpxchg(&dev->tx_ptr, ptr, new_ptr);
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+ } else {
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+ ptr = READ_ONCE(dev->rx_ptr);
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+ new_ptr = dev->rx_fn(dev, substream->runtime, ptr,
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+ &period_elapsed);
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+ cmpxchg(&dev->rx_ptr, ptr, new_ptr);
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+ }
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if (period_elapsed)
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- snd_pcm_period_elapsed(tx_substream);
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+ snd_pcm_period_elapsed(substream);
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}
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rcu_read_unlock();
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}
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+
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+void dw_pcm_push_tx(struct dw_i2s_dev *dev)
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+{
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+ dw_pcm_transfer(dev, true);
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+}
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EXPORT_SYMBOL_GPL(dw_pcm_push_tx);
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+void dw_pcm_pop_rx(struct dw_i2s_dev *dev)
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+{
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+ dw_pcm_transfer(dev, false);
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+}
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+EXPORT_SYMBOL_GPL(dw_pcm_pop_rx);
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+
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static int dw_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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@@ -126,20 +174,18 @@ static int dw_pcm_hw_params(struct snd_pcm_substream *substream,
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switch (params_format(hw_params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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dev->tx_fn = dw_pcm_tx_16;
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+ dev->rx_fn = dw_pcm_rx_16;
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break;
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+ case SNDRV_PCM_FORMAT_S24_LE:
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case SNDRV_PCM_FORMAT_S32_LE:
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dev->tx_fn = dw_pcm_tx_32;
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+ dev->rx_fn = dw_pcm_rx_32;
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break;
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default:
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dev_err(dev->dev, "invalid format\n");
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return -EINVAL;
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}
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- if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) {
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- dev_err(dev->dev, "only playback is available\n");
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- return -EINVAL;
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- }
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-
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ret = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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if (ret < 0)
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@@ -163,13 +209,21 @@ static int dw_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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- WRITE_ONCE(dev->tx_ptr, 0);
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- rcu_assign_pointer(dev->tx_substream, substream);
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+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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+ WRITE_ONCE(dev->tx_ptr, 0);
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+ rcu_assign_pointer(dev->tx_substream, substream);
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+ } else {
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+ WRITE_ONCE(dev->rx_ptr, 0);
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+ rcu_assign_pointer(dev->rx_substream, substream);
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+ }
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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- rcu_assign_pointer(dev->tx_substream, NULL);
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+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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+ rcu_assign_pointer(dev->tx_substream, NULL);
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+ else
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+ rcu_assign_pointer(dev->rx_substream, NULL);
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break;
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default:
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ret = -EINVAL;
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@@ -183,7 +237,12 @@ static snd_pcm_uframes_t dw_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct dw_i2s_dev *dev = runtime->private_data;
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- snd_pcm_uframes_t pos = READ_ONCE(dev->tx_ptr);
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+ snd_pcm_uframes_t pos;
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+
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+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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+ pos = READ_ONCE(dev->tx_ptr);
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+ else
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+ pos = READ_ONCE(dev->rx_ptr);
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return pos < runtime->buffer_size ? pos : 0;
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}
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