On Thu, 2009-11-26 at 16:13 +0100, Takashi Iwai wrote:
The non-coherent MIPS arch doesn't give the correct address by a simple virt_to_page() for pages allocated via dma_alloc_coherent().
Original patch by Wu Zhangjin wuzj@lemote.com. A proper check of the buffer allocation type was added to avoid the wrong conversion.
Note that this doesn't fix perfectly: the pages should be marked with proper pgprot value. This will be done in a future implementation like the conversion to dma_mmap_coherent().
Signed-off-by: Takashi Iwai tiwai@suse.de
sound/core/pcm_native.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index c906be2..e48c5f6 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -3066,6 +3066,10 @@ static inline struct page * snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) { void *vaddr = substream->runtime->dma_area + ofs; +#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
- if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
return virt_to_page(CAC_ADDR(vaddr));+#endif return virt_to_page(vaddr); }
Works well on Loongson family machines, thanks!
Regards, Wu Zhangjin