Dear Mr. Iwai,
Takashi Iwai wrote:
>
> The implementation depends pretty much on the architecture.
> (Also, dma_mmap() is no global function but specific only for ARM.)
> Since the vm_region struct is different between ppc and arm (the page
> pointer is missing in ppc version), it cannot be copied as it is.
>
> A simple (but totally untested) version would be like below:
>
> int dma_mmap_coherent(struct device *dev,
> struct vm_area_struct *vma, void *cpu_addr,
> dma_addr_t dma_addr, size_t size)
> {
> unsigned long pfn;
>
> pfn = page_to_pfn(virt_to_page(bus_to_virt(dma_addr)));
> vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
> return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
> vma->vm_end - vma->vm_start,
> vma->vm_pgprot);
> }
>
> (This might not work for some ppc models, though...)
>
> Then either add .mmap callback to each of snd_pcm_ops table in ca0106
> that calls dma_mmap_coherent() above, or change snd_pcm_default_mmap
> to call dma_mmap_coherent() directly instead of nopage method.
> For the former way, take a look at sound/arm/aaci.c (and devdma.c) as
> a reference.
>
I implemented this solution but speaker-test hangs in pcm.c, line 2299:
(gdb) frame 1
#1 0x0ff1df40 in snd_pcm_wait_nocheck (pcm=0x10032830, timeout=-1)
at pcm.c:2299
2299 err_poll = poll(pfd, npfds, timeout);
Any idea what is going wrong here?
--
Thank you,
David Cullen
Teligy
(864) 527-1263 Office
(864) 415-7063 Cell
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