[PATCHv2 3/3] ASoC: samsung: pass filter function as pointer

From: Arnd Bergmann
Date: Tue Nov 17 2015 - 10:55:59 EST

As we are now passing the filter data as pointers to the drivers,
we can take the final step and also pass the filter function the
same way. I'm keeping this change separate, as there it's less
obvious that this is a net win.

Upsides of this are:

- The ASoC drivers are completely independent from the DMA engine
implementation, which simplifies the Kconfig logic and in theory
allows the same sound drivers to be built in a kernel that supports
different kinds of dmaengine drivers.

- Consistency with other subsystems and drivers

On the other hand, we have a few downsides:

- The s3c24xx-dma driver now needs to be built-in for the ac97 platform
device to be instantiated on s3c2440.

- samsung_dmaengine_pcm_config cannot be marked 'const' any more
because the filter function pointer needs to be set at runtime.
This is safe as long we don't have multiple different DMA engines
in thet same system at runtime, but is nonetheless ugly.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
v2: avoid possibly NULL pdata

diff --git a/arch/arm/mach-s3c64xx/dev-audio.c b/arch/arm/mach-s3c64xx/dev-audio.c
index 9a42736ef4ac..b57783371d52 100644
--- a/arch/arm/mach-s3c64xx/dev-audio.c
+++ b/arch/arm/mach-s3c64xx/dev-audio.c
@@ -58,6 +58,7 @@ static struct resource s3c64xx_iis0_resource[] = {

static struct s3c_audio_pdata i2s0_pdata = {
.cfg_gpio = s3c64xx_i2s_cfg_gpio,
+ .dma_filter = pl08x_filter_id,
.dma_playback = DMACH_I2S0_OUT,
.dma_capture = DMACH_I2S0_IN,
};
@@ -79,6 +80,7 @@ static struct resource s3c64xx_iis1_resource[] = {

static struct s3c_audio_pdata i2s1_pdata = {
.cfg_gpio = s3c64xx_i2s_cfg_gpio,
+ .dma_filter = pl08x_filter_id,
.dma_playback = DMACH_I2S1_OUT,
.dma_capture = DMACH_I2S1_IN,
};
@@ -100,6 +102,7 @@ static struct resource s3c64xx_iisv4_resource[] = {

static struct s3c_audio_pdata i2sv4_pdata = {
.cfg_gpio = s3c64xx_i2s_cfg_gpio,
+ .dma_filter = pl08x_filter_id,
.dma_playback = DMACH_HSI_I2SV40_TX,
.dma_capture = DMACH_HSI_I2SV40_RX,
.type = {
@@ -150,6 +153,7 @@ static struct resource s3c64xx_pcm0_resource[] = {

static struct s3c_audio_pdata s3c_pcm0_pdata = {
.cfg_gpio = s3c64xx_pcm_cfg_gpio,
+ .dma_filter = pl08x_filter_id,
.dma_capture = DMACH_PCM0_RX,
.dma_playback = DMACH_PCM0_TX,
};
@@ -171,6 +175,7 @@ static struct resource s3c64xx_pcm1_resource[] = {

static struct s3c_audio_pdata s3c_pcm1_pdata = {
.cfg_gpio = s3c64xx_pcm_cfg_gpio,
+ .dma_filter = pl08x_filter_id,
.dma_playback = DMACH_PCM1_TX,
.dma_capture = DMACH_PCM1_RX,
};
@@ -205,6 +210,7 @@ static struct resource s3c64xx_ac97_resource[] = {

static struct s3c_audio_pdata s3c_ac97_pdata = {
.dma_playback = DMACH_AC97_PCMOUT,
+ .dma_filter = pl08x_filter_id,
.dma_capture = DMACH_AC97_PCMIN,
.dma_capture_mic = DMACH_AC97_MICIN,
};
diff --git a/arch/arm/plat-samsung/devs.c b/arch/arm/plat-samsung/devs.c
index fe5fe766f37f..a9d535ffdfaa 100644
--- a/arch/arm/plat-samsung/devs.c
+++ b/arch/arm/plat-samsung/devs.c
@@ -78,6 +78,9 @@ static struct resource s3c_ac97_resource[] = {
};

static struct s3c_audio_pdata s3c_ac97_pdata = {
+#ifdef CONFIG_S3C24XX_DMAC
+ .dma_filter = s3c24xx_dma_filter,
+#endif
.dma_playback = (void *)DMACH_PCM_OUT,
.dma_capture = (void *)DMACH_PCM_IN,
.dma_capture_mic = (void *)DMACH_MIC_IN,
@@ -572,6 +575,9 @@ static struct resource s3c_iis_resource[] = {
};

static struct s3c_audio_pdata s3c_iis_platdata = {
+#ifdef CONFIG_S3C24XX_DMAC
+ .dma_filter = s3c24xx_dma_filter,
+#endif
.dma_playback = (void *)DMACH_I2S_OUT,
.dma_capture = (void *)DMACH_I2S_IN,
};
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 3a8ce67910c2..79b1390f2016 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -444,7 +444,7 @@ config STM32_DMA
here.

config S3C24XX_DMAC
- tristate "Samsung S3C24XX DMA support"
+ bool "Samsung S3C24XX DMA support"
depends on ARCH_S3C24XX
select DMA_ENGINE
select DMA_VIRTUAL_CHANNELS
diff --git a/include/linux/platform_data/asoc-s3c.h b/include/linux/platform_data/asoc-s3c.h
index 33f88b4479e4..15bf56ee8af7 100644
--- a/include/linux/platform_data/asoc-s3c.h
+++ b/include/linux/platform_data/asoc-s3c.h
@@ -13,6 +13,9 @@
*/
#define S3C64XX_AC97_GPD 0
#define S3C64XX_AC97_GPE 1
+
+#include <linux/dmaengine.h>
+
extern void s3c64xx_ac97_setup_gpio(int);

struct samsung_i2s {
@@ -39,6 +42,7 @@ struct samsung_i2s {
*/
struct s3c_audio_pdata {
int (*cfg_gpio)(struct platform_device *);
+ dma_filter_fn dma_filter;
void *dma_playback;
void *dma_capture;
void *dma_play_sec;
diff --git a/sound/soc/samsung/Kconfig b/sound/soc/samsung/Kconfig
index 3744c9ed5370..78baa26e938b 100644
--- a/sound/soc/samsung/Kconfig
+++ b/sound/soc/samsung/Kconfig
@@ -1,8 +1,6 @@
config SND_SOC_SAMSUNG
tristate "ASoC support for Samsung"
depends on (PLAT_SAMSUNG || ARCH_EXYNOS)
- depends on S3C64XX_PL080 || !ARCH_S3C64XX
- depends on S3C24XX_DMAC || !ARCH_S3C24XX
select SND_SOC_GENERIC_DMAENGINE_PCM
help
Say Y or M if you want to add support for codecs attached to
diff --git a/sound/soc/samsung/ac97.c b/sound/soc/samsung/ac97.c
index 9c5219392460..4a7a503fe13c 100644
--- a/sound/soc/samsung/ac97.c
+++ b/sound/soc/samsung/ac97.c
@@ -388,7 +388,8 @@ static int s3c_ac97_probe(struct platform_device *pdev)
if (ret)
goto err5;

- ret = samsung_asoc_dma_platform_register(&pdev->dev);
+ ret = samsung_asoc_dma_platform_register(&pdev->dev,
+ ac97_pdata->dma_filter);
if (ret) {
dev_err(&pdev->dev, "failed to get register DMA: %d\n", ret);
goto err5;
diff --git a/sound/soc/samsung/dma.h b/sound/soc/samsung/dma.h
index 085ef30f5ca2..a7616cc9b39e 100644
--- a/sound/soc/samsung/dma.h
+++ b/sound/soc/samsung/dma.h
@@ -13,6 +13,7 @@
#define _S3C_AUDIO_H

#include <sound/dmaengine_pcm.h>
+#include <linux/dmaengine.h>

struct s3c_dma_params {
void *slave; /* Channel ID */
@@ -25,6 +26,7 @@ struct s3c_dma_params {
void samsung_asoc_init_dma_data(struct snd_soc_dai *dai,
struct s3c_dma_params *playback,
struct s3c_dma_params *capture);
-int samsung_asoc_dma_platform_register(struct device *dev);
+int samsung_asoc_dma_platform_register(struct device *dev,
+ dma_filter_fn fn);

#endif
diff --git a/sound/soc/samsung/dmaengine.c b/sound/soc/samsung/dmaengine.c
index 727008d57d14..063125937311 100644
--- a/sound/soc/samsung/dmaengine.c
+++ b/sound/soc/samsung/dmaengine.c
@@ -28,17 +28,8 @@

#include "dma.h"

-#ifdef CONFIG_ARCH_S3C64XX
-#define filter_fn pl08x_filter_id
-#elif defined(CONFIG_ARCH_S3C24XX)
-#define filter_fn s3c24xx_dma_filter
-#else
-#define filter_fn NULL
-#endif
-
-static const struct snd_dmaengine_pcm_config samsung_dmaengine_pcm_config = {
+static struct snd_dmaengine_pcm_config samsung_dmaengine_pcm_config = {
.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
- .compat_filter_fn = filter_fn,
};

void samsung_asoc_init_dma_data(struct snd_soc_dai *dai,
@@ -67,8 +58,11 @@ void samsung_asoc_init_dma_data(struct snd_soc_dai *dai,
}
EXPORT_SYMBOL_GPL(samsung_asoc_init_dma_data);

-int samsung_asoc_dma_platform_register(struct device *dev)
+int samsung_asoc_dma_platform_register(struct device *dev,
+ dma_filter_fn filter)
{
+ samsung_dmaengine_pcm_config.compat_filter_fn = filter;
+
return devm_snd_dmaengine_pcm_register(dev,
&samsung_dmaengine_pcm_config,
SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME |
diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
index 0945b5de39e7..84d9e77c0fbe 100644
--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -89,6 +89,7 @@ struct i2s_dai {
struct s3c_dma_params dma_playback;
struct s3c_dma_params dma_capture;
struct s3c_dma_params idma_playback;
+ dma_filter_fn filter;
u32 quirks;
u32 suspend_i2smod;
u32 suspend_i2scon;
@@ -1244,7 +1245,8 @@ static int samsung_i2s_probe(struct platform_device *pdev)
if (ret != 0)
return ret;

- return samsung_asoc_dma_platform_register(&pdev->dev);
+ return samsung_asoc_dma_platform_register(&pdev->dev,
+ sec_dai->filter);
}

pri_dai = i2s_alloc_dai(pdev, false);
@@ -1264,6 +1266,7 @@ static int samsung_i2s_probe(struct platform_device *pdev)

pri_dai->dma_playback.slave = i2s_pdata->dma_playback;
pri_dai->dma_capture.slave = i2s_pdata->dma_capture;
+ pri_dai->filter = i2s_pdata->dma_filter;

if (&i2s_pdata->type)
i2s_cfg = &i2s_pdata->type.i2s;
@@ -1325,8 +1328,10 @@ static int samsung_i2s_probe(struct platform_device *pdev)
sec_dai->dma_playback.dma_addr = regs_base + I2STXDS;
sec_dai->dma_playback.ch_name = "tx-sec";

- if (!np)
+ if (!np) {
sec_dai->dma_playback.slave = i2s_pdata->dma_play_sec;
+ sec_dai->filter = i2s_pdata->dma_filter;
+ }

sec_dai->dma_playback.dma_size = 4;
sec_dai->addr = pri_dai->addr;
@@ -1348,7 +1353,7 @@ static int samsung_i2s_probe(struct platform_device *pdev)

pm_runtime_enable(&pdev->dev);

- ret = samsung_asoc_dma_platform_register(&pdev->dev);
+ ret = samsung_asoc_dma_platform_register(&pdev->dev, pri_dai->filter);
if (ret != 0)
return ret;

diff --git a/sound/soc/samsung/pcm.c b/sound/soc/samsung/pcm.c
index c77f324e0bb8..498f563a4c9c 100644
--- a/sound/soc/samsung/pcm.c
+++ b/sound/soc/samsung/pcm.c
@@ -488,6 +488,7 @@ static int s3c_pcm_dev_probe(struct platform_device *pdev)
struct s3c_pcm_info *pcm;
struct resource *mem_res;
struct s3c_audio_pdata *pcm_pdata;
+ dma_filter_fn filter;
int ret;

/* Check for valid device index */
@@ -556,9 +557,11 @@ static int s3c_pcm_dev_probe(struct platform_device *pdev)
s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start
+ S3C_PCM_TXFIFO;

+ filter = NULL;
if (pcm_pdata) {
s3c_pcm_stereo_in[pdev->id].slave = pcm_pdata->dma_capture;
s3c_pcm_stereo_out[pdev->id].slave = pcm_pdata->dma_playback;
+ filter = pcm_pdata->dma_filter;
}

pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
@@ -573,7 +576,7 @@ static int s3c_pcm_dev_probe(struct platform_device *pdev)
goto err5;
}

- ret = samsung_asoc_dma_platform_register(&pdev->dev);
+ ret = samsung_asoc_dma_platform_register(&pdev->dev, filter);
if (ret) {
dev_err(&pdev->dev, "failed to get register DMA: %d\n", ret);
goto err5;
diff --git a/sound/soc/samsung/s3c2412-i2s.c b/sound/soc/samsung/s3c2412-i2s.c
index d5fb24047288..b45df460b44f 100644
--- a/sound/soc/samsung/s3c2412-i2s.c
+++ b/sound/soc/samsung/s3c2412-i2s.c
@@ -25,7 +25,6 @@
#include <sound/soc.h>
#include <sound/pcm_params.h>

-#include <mach/dma.h>
#include <mach/gpio-samsung.h>
#include <plat/gpio-cfg.h>

@@ -177,7 +176,8 @@ static int s3c2412_iis_dev_probe(struct platform_device *pdev)
return ret;
}

- ret = samsung_asoc_dma_platform_register(&pdev->dev);
+ ret = samsung_asoc_dma_platform_register(&pdev->dev,
+ pdata->dma_filter);
if (ret)
pr_err("failed to register the DMA: %d\n", ret);

diff --git a/sound/soc/samsung/s3c24xx-i2s.c b/sound/soc/samsung/s3c24xx-i2s.c
index 9e6a5bc012e3..b3a475d73ba7 100644
--- a/sound/soc/samsung/s3c24xx-i2s.c
+++ b/sound/soc/samsung/s3c24xx-i2s.c
@@ -23,7 +23,6 @@
#include <sound/soc.h>
#include <sound/pcm_params.h>

-#include <mach/dma.h>
#include <mach/gpio-samsung.h>
#include <plat/gpio-cfg.h>
#include "regs-iis.h"
@@ -482,7 +481,8 @@ static int s3c24xx_iis_dev_probe(struct platform_device *pdev)
return ret;
}

- ret = samsung_asoc_dma_platform_register(&pdev->dev);
+ ret = samsung_asoc_dma_platform_register(&pdev->dev,
+ pdata->dma_filter);
if (ret)
pr_err("failed to register the dma: %d\n", ret);

diff --git a/sound/soc/samsung/spdif.c b/sound/soc/samsung/spdif.c
index 9dd7ee6d03ff..4687f521197c 100644
--- a/sound/soc/samsung/spdif.c
+++ b/sound/soc/samsung/spdif.c
@@ -361,6 +361,7 @@ static int spdif_probe(struct platform_device *pdev)
struct s3c_audio_pdata *spdif_pdata;
struct resource *mem_res;
struct samsung_spdif_info *spdif;
+ dma_filter_fn filter;
int ret;

spdif_pdata = pdev->dev.platform_data;
@@ -426,11 +427,15 @@ static int spdif_probe(struct platform_device *pdev)

spdif_stereo_out.dma_size = 2;
spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
- spdif_stereo_out.slave = spdif_pdata ? spdif_pdata->dma_playback : NULL;
+ filter = NULL;
+ if (spdif_pdata) {
+ spdif_stereo_out.slave = spdif_pdata->dma_playback;
+ filter = spdif_pdata->dma_filter;
+ }

spdif->dma_playback = &spdif_stereo_out;

- ret = samsung_asoc_dma_platform_register(&pdev->dev);
+ ret = samsung_asoc_dma_platform_register(&pdev->dev, filter);
if (ret) {
dev_err(&pdev->dev, "failed to register DMA: %d\n", ret);
goto err4;

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