ASoC: rockchip: Use generic dmaengine code

This reverts commit 75b31192.

The original purpose of customized pcm was to config prealloc buffer size
flexibly. but, we can do the same thing by soc-generic-dmaengine-pcm.

And the generic one can generated the better config by querying DMA
capabilities from dmaengine driver rather than the Hard-Coded one.

e.g.

the customized one:

  static const struct snd_pcm_hardware snd_rockchip_hardware = {
         .info                   = SNDRV_PCM_INFO_MMAP |
                                   SNDRV_PCM_INFO_MMAP_VALID |
                                   SNDRV_PCM_INFO_PAUSE |
                                   SNDRV_PCM_INFO_RESUME |
                                   SNDRV_PCM_INFO_INTERLEAVED,
  ...

the generic one:

  ret = dma_get_slave_caps(chan, &dma_caps);
  if (ret == 0) {
          if (dma_caps.cmd_pause && dma_caps.cmd_resume)
                  hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
          if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
                  hw.info |= SNDRV_PCM_INFO_BATCH;
  ...

So, let's revert back to use the generic dmaengine pcm.
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Reviewed-by: John Keeping <john@metanate.com>
Link: https://lore.kernel.org/r/1632792957-80428-1-git-send-email-sugar.zhang@rock-chips.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/rockchip/Makefile

 # SPDX-License-Identifier: GPL-2.0
 # ROCKCHIP Platform Support
 snd-soc-rockchip-i2s-objs := rockchip_i2s.o
-snd-soc-rockchip-pcm-objs := rockchip_pcm.o
 snd-soc-rockchip-pdm-objs := rockchip_pdm.o
 snd-soc-rockchip-spdif-objs := rockchip_spdif.o
 
-obj-$(CONFIG_SND_SOC_ROCKCHIP_I2S) += snd-soc-rockchip-i2s.o snd-soc-rockchip-pcm.o
+obj-$(CONFIG_SND_SOC_ROCKCHIP_I2S) += snd-soc-rockchip-i2s.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_PDM) += snd-soc-rockchip-pdm.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_SPDIF) += snd-soc-rockchip-spdif.o
 

sound/soc/rockchip/rockchip_i2s.c

@@ -20,7 +20,6 @@
 #include <sound/dmaengine_pcm.h>
 
 #include "rockchip_i2s.h"
-#include "rockchip_pcm.h"
 
 #define DRV_NAME "rockchip-i2s"
 
@@ -756,7 +755,7 @@ static int rockchip_i2s_probe(struct platform_device *pdev)
 		goto err_suspend;
 	}
 
-	ret = rockchip_pcm_platform_register(&pdev->dev);
+	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 	if (ret) {
 		dev_err(&pdev->dev, "Could not register PCM\n");
 		goto err_suspend;

sound/soc/rockchip/rockchip_pcm.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2018 Rockchip Electronics Co. Ltd.
- */
-
-#include <linux/device.h>
-#include <linux/init.h>
-#include <linux/module.h>
-
-#include <sound/core.h>
-#include <sound/pcm.h>
-#include <sound/soc.h>
-#include <sound/dmaengine_pcm.h>
-
-#include "rockchip_pcm.h"
-
-static const struct snd_pcm_hardware snd_rockchip_hardware = {
-	.info			= SNDRV_PCM_INFO_MMAP |
-				  SNDRV_PCM_INFO_MMAP_VALID |
-				  SNDRV_PCM_INFO_PAUSE |
-				  SNDRV_PCM_INFO_RESUME |
-				  SNDRV_PCM_INFO_INTERLEAVED,
-	.period_bytes_min	= 32,
-	.period_bytes_max	= 8192,
-	.periods_min		= 1,
-	.periods_max		= 52,
-	.buffer_bytes_max	= 64 * 1024,
-	.fifo_size		= 32,
-};
-
-static const struct snd_dmaengine_pcm_config rk_dmaengine_pcm_config = {
-	.pcm_hardware = &snd_rockchip_hardware,
-	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
-	.prealloc_buffer_size = 32 * 1024,
-};
-
-int rockchip_pcm_platform_register(struct device *dev)
-{
-	return devm_snd_dmaengine_pcm_register(dev, &rk_dmaengine_pcm_config,
-		SND_DMAENGINE_PCM_FLAG_COMPAT);
-}
-EXPORT_SYMBOL_GPL(rockchip_pcm_platform_register);
-
-MODULE_LICENSE("GPL v2");

sound/soc/rockchip/rockchip_pcm.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (c) 2018 Rockchip Electronics Co. Ltd.
- */
-
-#ifndef _ROCKCHIP_PCM_H
-#define _ROCKCHIP_PCM_H
-
-int rockchip_pcm_platform_register(struct device *dev);
-
-#endif