linux-kernel - [PATCH 3.4 071/172] ASoC: omap-pcm: Correct dma mask

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Date:	Tue, 16 Jun 2015 16:35:25 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Peter Ujfalusi <peter.ujfalusi@...com>,
	Mark Brown <broonie@...nel.org>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 071/172] ASoC: omap-pcm: Correct dma mask

From: Peter Ujfalusi <peter.ujfalusi@...com>

3.4.108-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit d51199a83a2cf82a291d19ee852c44caa511427d upstream.

DMA_BIT_MASK of 64 is not valid dma address mask for OMAPs, it should be
set to 32.
The 64 was introduced by commit (in 2009):
a152ff24b978 ASoC: OMAP: Make DMA 64 aligned

But the dma_mask and coherent_dma_mask can not be used to specify alignment.

Fixes: a152ff24b978 (ASoC: OMAP: Make DMA 64 aligned)
Reported-by: Grygorii Strashko <Grygorii.Strashko@...aro.org>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
Signed-off-by: Mark Brown <broonie@...nel.org>
[lizf: Backported to 3.4: there's no dma_coerce_mask_and_coherent()]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 sound/soc/omap/omap-pcm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c
index 5a649da..96bce55a 100644
--- a/sound/soc/omap/omap-pcm.c
+++ b/sound/soc/omap/omap-pcm.c
@@ -333,7 +333,7 @@ static struct snd_pcm_ops omap_pcm_ops = {
 	.mmap		= omap_pcm_mmap,
 };
 
-static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
+static u64 omap_pcm_dmamask = DMA_BIT_MASK(32);
 
 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 	int stream)
@@ -384,7 +384,7 @@ static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
 	if (!card->dev->dma_mask)
 		card->dev->dma_mask = &omap_pcm_dmamask;
 	if (!card->dev->coherent_dma_mask)
-		card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
+		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 
 	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 		ret = omap_pcm_preallocate_dma_buffer(pcm,
-- 
1.9.1

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