From 6985c8877a711c7c307af05203858cb7c3c89d0d Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Thu, 26 Nov 2009 15:04:24 +0100 Subject: [PATCH] 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 Signed-off-by: Takashi Iwai --- sound/core/pcm_native.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index e48c5f6..29ab46a1 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); } -- 2.7.4