ASoC: Intel: Fix Audio DSP usage when IOMMU is enabled.

The Intel IOMMU requires that the ACPI device is used to allocate all
DMA memory buffers. This means we need to pass the DMA device pointer into child
component devices that allocate DMA memory.

We also only set the DMA mask for the ACPI device now instead of for each
component device.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

7 files changed, 12 insertions, 15 deletions

diff --git a/sound/soc/intel/sst-acpi.c b/sound/soc/intel/sst-acpi.c
index 5d06eecb6198..18aee77f8d4a 100644
--- a/sound/soc/intel/sst-acpi.c
+++ b/sound/soc/intel/sst-acpi.c
@@ -138,6 +138,7 @@ static int sst_acpi_probe(struct platform_device *pdev)
 
 	sst_pdata = &sst_acpi->sst_pdata;
 	sst_pdata->id = desc->sst_id;
+	sst_pdata->dma_dev = dev;
 	sst_acpi->desc = desc;
 	sst_acpi->mach = mach;
 
diff --git a/sound/soc/intel/sst-dsp-priv.h b/sound/soc/intel/sst-dsp-priv.h
index 30ca14a6a835..401213455497 100644
--- a/sound/soc/intel/sst-dsp-priv.h
+++ b/sound/soc/intel/sst-dsp-priv.h
@@ -228,6 +228,7 @@ struct sst_dsp {
 	spinlock_t spinlock;	/* IPC locking */
 	struct mutex mutex;	/* DSP FW lock */
 	struct device *dev;
+	struct device *dma_dev;
 	void *thread_context;
 	int irq;
 	u32 id;
diff --git a/sound/soc/intel/sst-dsp.c b/sound/soc/intel/sst-dsp.c
index 0c129fd85ecf..0b715b20a2d7 100644
--- a/sound/soc/intel/sst-dsp.c
+++ b/sound/soc/intel/sst-dsp.c
@@ -337,6 +337,7 @@ struct sst_dsp *sst_dsp_new(struct device *dev,
 	spin_lock_init(&sst->spinlock);
 	mutex_init(&sst->mutex);
 	sst->dev = dev;
+	sst->dma_dev = pdata->dma_dev;
 	sst->thread_context = sst_dev->thread_context;
 	sst->sst_dev = sst_dev;
 	sst->id = pdata->id;
diff --git a/sound/soc/intel/sst-dsp.h b/sound/soc/intel/sst-dsp.h
index 74052b59485c..e44423be66c4 100644
--- a/sound/soc/intel/sst-dsp.h
+++ b/sound/soc/intel/sst-dsp.h
@@ -169,6 +169,7 @@ struct sst_pdata {
 	u32 dma_base;
 	u32 dma_size;
 	int dma_engine;
+	struct device *dma_dev;
 
 	/* DSP */
 	u32 id;
diff --git a/sound/soc/intel/sst-firmware.c b/sound/soc/intel/sst-firmware.c
index 5fed75cef64f..c38cfda8003c 100644
--- a/sound/soc/intel/sst-firmware.c
+++ b/sound/soc/intel/sst-firmware.c
@@ -57,14 +57,8 @@ struct sst_fw *sst_fw_new(struct sst_dsp *dsp,
 	sst_fw->private = private;
 	sst_fw->size = fw->size;
 
-	err = dma_coerce_mask_and_coherent(dsp->dev, DMA_BIT_MASK(32));
-	if (err < 0) {
-		kfree(sst_fw);
-		return NULL;
-	}
-
 	/* allocate DMA buffer to store FW data */
-	sst_fw->dma_buf = dma_alloc_coherent(dsp->dev, sst_fw->size,
+	sst_fw->dma_buf = dma_alloc_coherent(dsp->dma_dev, sst_fw->size,
 				&sst_fw->dmable_fw_paddr, GFP_DMA | GFP_KERNEL);
 	if (!sst_fw->dma_buf) {
 		dev_err(dsp->dev, "error: DMA alloc failed\n");
@@ -106,7 +100,7 @@ void sst_fw_free(struct sst_fw *sst_fw)
 	list_del(&sst_fw->list);
 	mutex_unlock(&dsp->mutex);
 
-	dma_free_coherent(dsp->dev, sst_fw->size, sst_fw->dma_buf,
+	dma_free_coherent(dsp->dma_dev, sst_fw->size, sst_fw->dma_buf,
 			sst_fw->dmable_fw_paddr);
 	kfree(sst_fw);
 }
diff --git a/sound/soc/intel/sst-haswell-dsp.c b/sound/soc/intel/sst-haswell-dsp.c
index f5ebf36af889..535f517629fd 100644
--- a/sound/soc/intel/sst-haswell-dsp.c
+++ b/sound/soc/intel/sst-haswell-dsp.c
@@ -433,7 +433,7 @@ static int hsw_init(struct sst_dsp *sst, struct sst_pdata *pdata)
 	int ret = -ENODEV, i, j, region_count;
 	u32 offset, size;
 
-	dev = sst->dev;
+	dev = sst->dma_dev;
 
 	switch (sst->id) {
 	case SST_DEV_ID_LYNX_POINT:
@@ -466,7 +466,7 @@ static int hsw_init(struct sst_dsp *sst, struct sst_pdata *pdata)
 		return ret;
 	}
 
-	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
+	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(31));
 	if (ret)
 		return ret;
 
diff --git a/sound/soc/intel/sst-haswell-pcm.c b/sound/soc/intel/sst-haswell-pcm.c
index dc53f501c64c..ba585a75878d 100644
--- a/sound/soc/intel/sst-haswell-pcm.c
+++ b/sound/soc/intel/sst-haswell-pcm.c
@@ -633,17 +633,16 @@ static void hsw_pcm_free(struct snd_pcm *pcm)
 static int hsw_pcm_new(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_pcm *pcm = rtd->pcm;
+	struct snd_soc_platform *platform = rtd->platform;
+	struct sst_pdata *pdata = dev_get_platdata(platform->dev);
+	struct device *dev = pdata->dma_dev;
 	int ret = 0;
 
-	ret = dma_coerce_mask_and_coherent(rtd->card->dev, DMA_BIT_MASK(32));
-	if (ret)
-		return ret;
-
 	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream ||
 			pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 		ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
 			SNDRV_DMA_TYPE_DEV_SG,
-			rtd->card->dev,
+			dev,
 			hsw_pcm_hardware.buffer_bytes_max,
 			hsw_pcm_hardware.buffer_bytes_max);
 		if (ret) {