13 Jul
2011
13 Jul
'11
9:44 a.m.
On Tue, Jul 12, 2011 at 11:04:36PM +0800, Dong Aisheng wrote:
+static int mxs_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) +{
- struct snd_pcm_substream *substream = pcm->streams[stream].substream;
- struct snd_dma_buffer *buf = &substream->dma_buffer;
- size_t size = 64 * 1024;
- buf->dev.type = SNDRV_DMA_TYPE_DEV;
- buf->dev.dev = pcm->card->dev;
- buf->private_data = NULL;
- buf->area = dma_alloc_writecombine(pcm->card->dev, size,
&buf->addr, GFP_KERNEL);
...
+static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream,
struct vm_area_struct *vma)+{
- struct snd_pcm_runtime *runtime = substream->runtime;
- int ret;
- ret = dma_mmap_coherent(NULL, vma, runtime->dma_area,
runtime->dma_addr, runtime->dma_bytes);
This is wrong. Hint 1:
int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size)
Hint 2: struct device *dev - you have one above.