From: wdc <wdc@rock-chips.com>
Date: Sat, 20 Oct 2012 09:12:38 +0000 (+0800)
Subject: audio:解决录音时内存mmap出错，将原有的DMA方式修改成SDRM方式
X-Git-Tag: firefly_0821_release~8353
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0cde7717dbebd1a557f21fb69db95a9b862154f1;p=firefly-linux-kernel-4.4.55.git

audio:解决录音时内存mmap出错，将原有的DMA方式修改成SDRM方式

[modified-files]
sound/soc/rk29/rk29_pcm.c
---

diff --git a/sound/soc/rk29/rk29_pcm.c b/sound/soc/rk29/rk29_pcm.c
index 602e53c757b2..072aeb713360 100755
--- a/sound/soc/rk29/rk29_pcm.c
+++ b/sound/soc/rk29/rk29_pcm.c
@@ -467,12 +467,19 @@ static int rockchip_pcm_mmap(struct snd_pcm_substream *substream,
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 
-	DBG("Enter::%s----%d\n",__FUNCTION__,__LINE__);
+   DBG("Enter::%s----%d\n",__FUNCTION__,__LINE__);
 
+#ifdef CONFIG_RK_SRAM_DMA
+	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+        return remap_pfn_range(vma, vma->vm_start,
+		       substream->dma_buffer.addr >> PAGE_SHIFT,
+		       vma->vm_end - vma->vm_start, vma->vm_page_prot);
+#else
 	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 				     runtime->dma_area,
 				     runtime->dma_addr,
 				     runtime->dma_bytes);
+#endif
 }
 
 static struct snd_pcm_ops rockchip_pcm_ops = {