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Date:   Tue, 19 Oct 2021 12:05:10 +0100
From:   John Keeping <john@metanate.com>
To:     Sugar Zhang <sugar.zhang@rock-chips.com>
Cc:     broonie@kernel.org, heiko@sntech.de, alsa-devel@alsa-project.org,
        linux-kernel@vger.kernel.org, Takashi Iwai <tiwai@suse.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        linux-rockchip@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] Revert "ASoC: rockchip: add config for rockchip
 dmaengine pcm register"
Message-ID: <20211019120510.363578b8.john@metanate.com>
In-Reply-To: <1632792957-80428-1-git-send-email-sugar.zhang@rock-chips.com>
References: <1632792957-80428-1-git-send-email-sugar.zhang@rock-chips.com>
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On Tue, 28 Sep 2021 09:35:57 +0800
Sugar Zhang <sugar.zhang@rock-chips.com> wrote:

> This reverts commit 75b31192fe6ad20b42276b20ee3bdf1493216d63.
> 
> 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>

> ---
> 
>  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 65e814d..05b078e 100644
> --- a/sound/soc/rockchip/Makefile
> +++ b/sound/soc/rockchip/Makefile
> @@ -1,11 +1,10 @@
>  # 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
>  
> diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
> index 7e89f5b..a6d7656 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 02254e4..0000000
> --- 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 7f00e2c..0000000
> --- 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