ASoC: SPEAr: remove custom DMA alloc compat function

spear_pcm_request_chan() is almost identical to
dmaengine_pcm_compat_request_channel(), with the exception that the
latter:

a) Assumes that the DAI DMA data is a struct snd_dmaengine_dai_dma_data
   pointer rather than some custom type.

b) dma_data->filter_data rather than dma_data should be passed to
   snd_dmaengine_pcm_request_channel() as the filter data.

Make minor changes to the SPEAr DAI drivers so that those two conditions
are met. This allows removal of the custom .compat_request_channel().

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

include/sound/spear_dma.h

@@ -29,7 +29,6 @@ struct spear_dma_data {
 	dma_addr_t addr;
 	u32 max_burst;
 	enum dma_slave_buswidth addr_width;
-	bool (*filter)(struct dma_chan *chan, void *slave);
 };
 
 #endif /* SPEAR_DMA_H */

sound/soc/spear/spdif_in.c

@@ -18,6 +18,7 @@
 #include <linux/ioport.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <sound/dmaengine_pcm.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
@@ -38,6 +39,8 @@ struct spdif_in_dev {
 	struct device *dev;
 	void (*reset_perip)(void);
 	int irq;
+	struct snd_dmaengine_dai_dma_data dma_params_rx;
+	struct snd_dmaengine_pcm_config config;
 };
 
 static void spdif_in_configure(struct spdif_in_dev *host)
@@ -54,7 +57,8 @@ static int spdif_in_dai_probe(struct snd_soc_dai *dai)
 {
 	struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
 
-	dai->capture_dma_data = &host->dma_params;
+	host->dma_params_rx.filter_data = &host->dma_params;
+	dai->capture_dma_data = &host->dma_params_rx;
 
 	return 0;
 }
@@ -245,7 +249,6 @@ static int spdif_in_probe(struct platform_device *pdev)
 	host->dma_params.addr = res_fifo->start;
 	host->dma_params.max_burst = 16;
 	host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-	host->dma_params.filter = pdata->filter;
 	host->reset_perip = pdata->reset_perip;
 
 	host->dev = &pdev->dev;
@@ -263,7 +266,8 @@ static int spdif_in_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	return devm_spear_pcm_platform_register(&pdev->dev);
+	return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
+						pdata->filter);
 }
 
 static struct platform_driver spdif_in_driver = {

sound/soc/spear/spdif_out.c

@@ -18,6 +18,7 @@
 #include <linux/ioport.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <sound/dmaengine_pcm.h>
 #include <sound/soc.h>
 #include <sound/spear_dma.h>
 #include <sound/spear_spdif.h>
@@ -36,6 +37,8 @@ struct spdif_out_dev {
 	struct spdif_out_params saved_params;
 	u32 running;
 	void __iomem *io_base;
+	struct snd_dmaengine_dai_dma_data dma_params_tx;
+	struct snd_dmaengine_pcm_config config;
 };
 
 static void spdif_out_configure(struct spdif_out_dev *host)
@@ -245,7 +248,8 @@ static int spdif_soc_dai_probe(struct snd_soc_dai *dai)
 {
 	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
 
-	dai->playback_dma_data = &host->dma_params;
+	host->dma_params_tx.filter_data = &host->dma_params;
+	dai->playback_dma_data = &host->dma_params_tx;
 
 	return snd_soc_add_dai_controls(dai, spdif_out_controls,
 				ARRAY_SIZE(spdif_out_controls));
@@ -304,7 +308,6 @@ static int spdif_out_probe(struct platform_device *pdev)
 	host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA;
 	host->dma_params.max_burst = 16;
 	host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-	host->dma_params.filter = pdata->filter;
 
 	dev_set_drvdata(&pdev->dev, host);
 
@@ -313,7 +316,8 @@ static int spdif_out_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	return devm_spear_pcm_platform_register(&pdev->dev);
+	return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
+						pdata->filter);
 }
 
 #ifdef CONFIG_PM

sound/soc/spear/spear_pcm.c

@@ -32,26 +32,19 @@ static const struct snd_pcm_hardware spear_pcm_hardware = {
 	.fifo_size = 0, /* fifo size in bytes */
 };
 
-static struct dma_chan *spear_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
-	struct snd_pcm_substream *substream)
-{
-	struct spear_dma_data *dma_data;
-
-	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
-
-	return snd_dmaengine_pcm_request_channel(dma_data->filter, dma_data);
-}
-
 static const struct snd_dmaengine_pcm_config spear_dmaengine_pcm_config = {
 	.pcm_hardware = &spear_pcm_hardware,
-	.compat_request_channel = spear_pcm_request_chan,
 	.prealloc_buffer_size = 16 * 1024,
 };
 
-int devm_spear_pcm_platform_register(struct device *dev)
+int devm_spear_pcm_platform_register(struct device *dev,
+			struct snd_dmaengine_pcm_config *config,
+			bool (*filter)(struct dma_chan *chan, void *slave))
 {
-	return devm_snd_dmaengine_pcm_register(dev,
+	*config = spear_dmaengine_pcm_config;
-		&spear_dmaengine_pcm_config,
+	config->compat_filter_fn = filter;
+
+	return snd_dmaengine_pcm_register(dev, config,
 		SND_DMAENGINE_PCM_FLAG_NO_DT |
 		SND_DMAENGINE_PCM_FLAG_COMPAT);
 }

sound/soc/spear/spear_pcm.h

@@ -17,6 +17,8 @@
 #ifndef __SPEAR_PCM_H__
 #define __SPEAR_PCM_H__
 
-int devm_spear_pcm_platform_register(struct device *dev);
+int devm_spear_pcm_platform_register(struct device *dev,
+			struct snd_dmaengine_pcm_config *config,
+			bool (*filter)(struct dma_chan *chan, void *slave));
 
 #endif