linux-kernel - [PATCH] ASoC: rockchip: use generic DMA engine configuration

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Date:   Mon, 18 Oct 2021 12:48:44 +0100
From:   John Keeping <john@...anate.com>
To:     alsa-devel@...a-project.org
Cc:     John Keeping <john@...anate.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Heiko Stuebner <heiko@...ech.de>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: [PATCH] ASoC: rockchip: use generic DMA engine configuration

This effectively reverts commit 75b31192fe6a ("ASoC: rockchip: add
config for rockchip dmaengine pcm register").

There doesn't seem to be any rationale given for why these specific
values are helpful.  The generic DMA engine provides sensible defaults
here and works well with Rockchip I2S.

In fact the period size here is really quite restrictive when dealing
with 8 channels of 32-bit data as the effective period size is just 256
frames.

Signed-off-by: John Keeping <john@...anate.com>
---
 sound/soc/rockchip/Makefile       |  3 +--
 sound/soc/rockchip/rockchip_i2s.c |  3 +--
 sound/soc/rockchip/rockchip_pcm.c | 44 -------------------------------
 sound/soc/rockchip/rockchip_pcm.h | 11 --------
 4 files changed, 2 insertions(+), 59 deletions(-)
 delete mode 100644 sound/soc/rockchip/rockchip_pcm.c
 delete mode 100644 sound/soc/rockchip/rockchip_pcm.h

diff --git a/sound/soc/rockchip/Makefile b/sound/soc/rockchip/Makefile
index b10f5e7b136d..6a3e61178152 100644
--- a/sound/soc/rockchip/Makefile
+++ b/sound/soc/rockchip/Makefile
@@ -2,11 +2,10 @@
 # ROCKCHIP Platform Support
 snd-soc-rockchip-i2s-objs := rockchip_i2s.o
 snd-soc-rockchip-i2s-tdm-objs := rockchip_i2s_tdm.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-$(CONFIG_SND_SOC_ROCKCHIP_I2S_TDM) += snd-soc-rockchip-i2s-tdm.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_PDM) += snd-soc-rockchip-pdm.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_SPDIF) += snd-soc-rockchip-spdif.o
diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index 7e89f5b0c237..a6d7656c206e 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/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;
diff --git a/sound/soc/rockchip/rockchip_pcm.c b/sound/soc/rockchip/rockchip_pcm.c
deleted file mode 100644
index 02254e42135e..000000000000
--- a/sound/soc/rockchip/rockchip_pcm.c
+++ /dev/null
@@ -1,44 +0,0 @@
-// 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");
diff --git a/sound/soc/rockchip/rockchip_pcm.h b/sound/soc/rockchip/rockchip_pcm.h
deleted file mode 100644
index 7f00e2ce3603..000000000000
--- a/sound/soc/rockchip/rockchip_pcm.h
+++ /dev/null
@@ -1,11 +0,0 @@
-/* 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
-- 
2.33.1