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| author | Takashi Iwai <tiwai@suse.de> | 2009-11-26 17:04:24 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-11-27 12:15:23 +0300 |
| commit | 6985c8877a711c7c307af05203858cb7c3c89d0d (patch) | |
| tree | 9b7ca278250a3fe159cb9f763dc04fc492eb7e19 /sound | |
| parent | 66b6cfacfc5aa2fda37b0d40cd54931ca5ef8cd7 (diff) | |
| download | linux-6985c8877a711c7c307af05203858cb7c3c89d0d.tar.xz | |
ALSA: pcm - fix page conversion on non-coherent PPC arch
The non-cohernet PPC arch doesn't give the correct address by a simple
virt_to_page() for pages allocated via dma_alloc_coherent().
This patch adds a hack to fix the conversion similarly like MIPS.
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().
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/core/pcm_native.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index e48c5f618578..29ab46a12e11 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -3070,6 +3070,16 @@ snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) return virt_to_page(CAC_ADDR(vaddr)); #endif +#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE) + if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) { + dma_addr_t addr = substream->runtime->dma_addr + ofs; + addr -= get_dma_offset(substream->dma_buffer.dev.dev); + /* assume dma_handle set via pfn_to_phys() in + * mm/dma-noncoherent.c + */ + return pfn_to_page(addr >> PAGE_SHIFT); + } +#endif return virt_to_page(vaddr); } |