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authorTakashi Iwai <tiwai@suse.de>2009-11-26 15:04:24 +0100
committerTakashi Iwai <tiwai@suse.de>2009-11-27 10:15:23 +0100
commit6985c8877a711c7c307af05203858cb7c3c89d0d (patch)
tree9b7ca278250a3fe159cb9f763dc04fc492eb7e19 /sound/core/pcm_native.c
parent66b6cfacfc5aa2fda37b0d40cd54931ca5ef8cd7 (diff)
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/core/pcm_native.c')
-rw-r--r--sound/core/pcm_native.c10
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);
}