#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
+#include <linux/gfp.h>
#include <sound/core.h>
#include <sound/pcm.h>
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = fsl_dma_dmamask;
- ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev,
+ ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
fsl_dma_hardware.buffer_bytes_max,
&pcm->streams[0].substream->dma_buffer);
if (ret) {
return -ENOMEM;
}
- ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev,
+ ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
fsl_dma_hardware.buffer_bytes_max,
&pcm->streams[1].substream->dma_buffer);
if (ret) {
return -EBUSY;
}
- dma_private = dma_alloc_coherent(substream->pcm->dev,
+ dma_private = dma_alloc_coherent(substream->pcm->card->dev,
sizeof(struct fsl_dma_private), &ld_buf_phys, GFP_KERNEL);
if (!dma_private) {
dev_err(substream->pcm->card->dev,
dev_err(substream->pcm->card->dev,
"can't register ISR for IRQ %u (ret=%i)\n",
dma_private->irq, ret);
- dma_free_coherent(substream->pcm->dev,
+ dma_free_coherent(substream->pcm->card->dev,
sizeof(struct fsl_dma_private),
dma_private, dma_private->ld_buf_phys);
return ret;
else
position = in_be32(&dma_channel->dar);
+ /*
+ * When capture is started, the SSI immediately starts to fill its FIFO.
+ * This means that the DMA controller is not started until the FIFO is
+ * full. However, ALSA calls this function before that happens, when
+ * MR.DAR is still zero. In this case, just return zero to indicate
+ * that nothing has been received yet.
+ */
+ if (!position)
+ return 0;
+
+ if ((position < dma_private->dma_buf_phys) ||
+ (position > dma_private->dma_buf_end)) {
+ dev_err(substream->pcm->card->dev,
+ "dma pointer is out of range, halting stream\n");
+ return SNDRV_PCM_POS_XRUN;
+ }
+
frames = bytes_to_frames(runtime, position - dma_private->dma_buf_phys);
/*
free_irq(dma_private->irq, dma_private);
if (dma_private->ld_buf_phys) {
- dma_unmap_single(substream->pcm->dev,
+ dma_unmap_single(substream->pcm->card->dev,
dma_private->ld_buf_phys,
sizeof(dma_private->link), DMA_TO_DEVICE);
}
/* Deallocate the fsl_dma_private structure */
- dma_free_coherent(substream->pcm->dev,
+ dma_free_coherent(substream->pcm->card->dev,
sizeof(struct fsl_dma_private),
dma_private, dma_private->ld_buf_phys);
substream->runtime->private_data = NULL;