[PATCH 0/3] ASoC: meson: aiu: add Meson8 SoC family support

[PATCH 0/3] ASoC: meson: aiu: add Meson8 SoC family support

[Martin Blumenstingl]

This series adds support for the AIU audio controller found on the
32-bit Meson8 and Meson8b SoCs (both seem to use the same revision,
but for safety reasons we add two compatible strings).

The only known difference compared to the GX SoCs is the absence of
the I2S divider in the AIU_CLK_CTRL_MORE register. Instead we have
to use a less flexible divider.

I2S testing was done on an Odroid-C1+ with a PCM5102A stereo DAC
board connected (on the J7 header) like this:
Odroid-C1+  | DAC
------------------
pin #1 GND  | GND
pin #3 5V   | VIN
pin #4 MCLK | SCK (optional, DAC can operate without this)
pin #5 LRCK | LCK
pin #5 SCK  | BCK
pin #5 DATA | DIN

In 3-wire I2S the MCLK <-> SCK connection can be omitted. For my tests
I used mclk-fs = <64> in this case.
In 4-wire I2S the MCLK <-> SCK connection is required. For my tests I
used mclk-fs = <256> in this case.


Martin Blumenstingl (3):
  ASoC: meson: aiu: Document Meson8 and Meson8b support in the
    dt-bindings
  ASoC: meson: aiu: introduce a struct for platform specific information
  ASoC: meson: aiu: add support for the Meson8 and Meson8b SoC families

 .../bindings/sound/amlogic,aiu.yaml           |  2 +
 sound/soc/meson/Kconfig                       |  2 +-
 sound/soc/meson/aiu-encoder-i2s.c             | 92 ++++++++++++++-----
 sound/soc/meson/aiu.c                         | 28 +++++-
 sound/soc/meson/aiu.h                         |  6 ++
 5 files changed, 104 insertions(+), 26 deletions(-)

-- 
2.25.1


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[PATCH 1/3] ASoC: meson: aiu: Document Meson8 and Meson8b support in the dt-bindings

[Martin Blumenstingl]

The AIU audio output controller on the Meson8 and Meson8b SoC families
is compatible with the one found in the GXBB family. Document the
compatible string for these two older SoCs.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 Documentation/devicetree/bindings/sound/amlogic,aiu.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/amlogic,aiu.yaml b/Documentation/devicetree/bindings/sound/amlogic,aiu.yaml
index 3ef7632dcb59..a61bccf915d8 100644
--- a/Documentation/devicetree/bindings/sound/amlogic,aiu.yaml
+++ b/Documentation/devicetree/bindings/sound/amlogic,aiu.yaml
@@ -21,6 +21,8 @@ properties:
       - enum:
         - amlogic,aiu-gxbb
         - amlogic,aiu-gxl
+        - amlogic,aiu-meson8
+        - amlogic,aiu-meson8b
       - const:
           amlogic,aiu
 
-- 
2.25.1


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[PATCH 2/3] ASoC: meson: aiu: introduce a struct for platform specific information

[Martin Blumenstingl]

Introduce a struct aiu_platform_data to make the driver aware of
platform specific information. Convert the existing check for the
internal stereo audio codec (only available on GXL) to this new struct.
Support for the 32-bit SoCs will need this as well because the
AIU_CLK_CTRL_MORE register doesn't have the I2S divider bits (and we
need to use the I2S divider from AIU_CLK_CTRL instead).

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 sound/soc/meson/aiu.c | 19 ++++++++++++++++---
 sound/soc/meson/aiu.h |  5 +++++
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/sound/soc/meson/aiu.c b/sound/soc/meson/aiu.c
index d3e2d40e9562..38209312a8c3 100644
--- a/sound/soc/meson/aiu.c
+++ b/sound/soc/meson/aiu.c
@@ -273,6 +273,11 @@ static int aiu_probe(struct platform_device *pdev)
 	aiu = devm_kzalloc(dev, sizeof(*aiu), GFP_KERNEL);
 	if (!aiu)
 		return -ENOMEM;
+
+	aiu->platform = device_get_match_data(dev);
+	if (!aiu->platform)
+		return -ENODEV;
+
 	platform_set_drvdata(pdev, aiu);
 
 	ret = device_reset(dev);
@@ -322,7 +327,7 @@ static int aiu_probe(struct platform_device *pdev)
 	}
 
 	/* Register the internal dac control component on gxl */
-	if (of_device_is_compatible(dev->of_node, "amlogic,aiu-gxl")) {
+	if (aiu->platform->has_acodec) {
 		ret = aiu_acodec_ctrl_register_component(dev);
 		if (ret) {
 			dev_err(dev,
@@ -344,9 +349,17 @@ static int aiu_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct aiu_platform_data aiu_gxbb_pdata = {
+	.has_acodec = false,
+};
+
+static const struct aiu_platform_data aiu_gxl_pdata = {
+	.has_acodec = true,
+};
+
 static const struct of_device_id aiu_of_match[] = {
-	{ .compatible = "amlogic,aiu-gxbb", },
-	{ .compatible = "amlogic,aiu-gxl", },
+	{ .compatible = "amlogic,aiu-gxbb", .data = &aiu_gxbb_pdata },
+	{ .compatible = "amlogic,aiu-gxl", .data = &aiu_gxl_pdata },
 	{}
 };
 MODULE_DEVICE_TABLE(of, aiu_of_match);
diff --git a/sound/soc/meson/aiu.h b/sound/soc/meson/aiu.h
index 06a968c55728..ab003638d5e5 100644
--- a/sound/soc/meson/aiu.h
+++ b/sound/soc/meson/aiu.h
@@ -27,11 +27,16 @@ struct aiu_interface {
 	int irq;
 };
 
+struct aiu_platform_data {
+	bool has_acodec;
+};
+
 struct aiu {
 	struct clk *pclk;
 	struct clk *spdif_mclk;
 	struct aiu_interface i2s;
 	struct aiu_interface spdif;
+	const struct aiu_platform_data *platform;
 };
 
 #define AIU_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |	\
-- 
2.25.1


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[PATCH 3/3] ASoC: meson: aiu: add support for the Meson8 and Meson8b SoC families

[Martin Blumenstingl]

The AIU audio controller on the Meson8 and Meson8b SoC families is
compatible with the one found in the later GXBB family. Add compatible
strings for these two older SoC families so the driver can be loaded for
them.

Instead of using the I2S divider from the AIU_CLK_CTRL_MORE register we
need to use the I2S divider from the AIU_CLK_CTRL register. This older
register is less flexible because it only supports four divider settings
(1, 2, 4, 8) compared to the AIU_CLK_CTRL_MORE register (which supports
dividers in the range 0..64).

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 sound/soc/meson/Kconfig           |  2 +-
 sound/soc/meson/aiu-encoder-i2s.c | 92 +++++++++++++++++++++++--------
 sound/soc/meson/aiu.c             |  9 +++
 sound/soc/meson/aiu.h             |  1 +
 4 files changed, 81 insertions(+), 23 deletions(-)

diff --git a/sound/soc/meson/Kconfig b/sound/soc/meson/Kconfig
index 897a706dcda0..d27e9180b453 100644
--- a/sound/soc/meson/Kconfig
+++ b/sound/soc/meson/Kconfig
@@ -10,7 +10,7 @@ config SND_MESON_AIU
 	imply SND_SOC_HDMI_CODEC if DRM_MESON_DW_HDMI
 	help
 	  Select Y or M to add support for the Audio output subsystem found
-	  in the Amlogic GX SoC family
+	  in the Amlogic Meson8, Meson8b and GX SoC families
 
 config SND_MESON_AXG_FIFO
 	tristate
diff --git a/sound/soc/meson/aiu-encoder-i2s.c b/sound/soc/meson/aiu-encoder-i2s.c
index 4900e38e7e49..cc73b5d5c2b7 100644
--- a/sound/soc/meson/aiu-encoder-i2s.c
+++ b/sound/soc/meson/aiu-encoder-i2s.c
@@ -111,34 +111,40 @@ static int aiu_encoder_i2s_setup_desc(struct snd_soc_component *component,
 	return 0;
 }
 
-static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
-				      struct snd_pcm_hw_params *params)
+static int aiu_encoder_i2s_set_legacy_div(struct snd_soc_component *component,
+					  struct snd_pcm_hw_params *params,
+					  unsigned int bs)
 {
-	struct aiu *aiu = snd_soc_component_get_drvdata(component);
-	unsigned int srate = params_rate(params);
-	unsigned int fs, bs;
-
-	/* Get the oversampling factor */
-	fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);
+	switch (bs) {
+	case 1:
+	case 2:
+	case 4:
+	case 8:
+		/* These are the only valid legacy dividers */
+		break;
 
-	if (fs % 64)
+	default:
+		dev_err(component->dev, "Unsupported i2s divider: %u\n", bs);
 		return -EINVAL;
+	};
 
-	/* Send data MSB first */
-	snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
-				      AIU_I2S_DAC_CFG_MSB_FIRST,
-				      AIU_I2S_DAC_CFG_MSB_FIRST);
+	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
+				      AIU_CLK_CTRL_I2S_DIV,
+				      FIELD_PREP(AIU_CLK_CTRL_I2S_DIV,
+						 __ffs(bs)));
 
-	/* Set bclk to lrlck ratio */
-	snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
-				      AIU_CODEC_DAC_LRCLK_CTRL_DIV,
-				      FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
-						 64 - 1));
+	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
+				      AIU_CLK_CTRL_MORE_I2S_DIV,
+				      FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
+						 0));
 
-	/* Use CLK_MORE for mclk to bclk divider */
-	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
-				      AIU_CLK_CTRL_I2S_DIV, 0);
+	return 0;
+}
 
+static int aiu_encoder_i2s_set_more_div(struct snd_soc_component *component,
+					struct snd_pcm_hw_params *params,
+					unsigned int bs)
+{
 	/*
 	 * NOTE: this HW is odd.
 	 * In most configuration, the i2s divider is 'mclk / blck'.
@@ -146,7 +152,6 @@ static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
 	 * increased by 50% to get the correct output rate.
 	 * No idea why !
 	 */
-	bs = fs / 64;
 	if (params_width(params) == 16 && params_channels(params) == 8) {
 		if (bs % 2) {
 			dev_err(component->dev,
@@ -156,11 +161,54 @@ static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
 		bs += bs / 2;
 	}
 
+	/* Use CLK_MORE for mclk to bclk divider */
+	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
+				      AIU_CLK_CTRL_I2S_DIV,
+				      FIELD_PREP(AIU_CLK_CTRL_I2S_DIV, 0));
+
 	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
 				      AIU_CLK_CTRL_MORE_I2S_DIV,
 				      FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
 						 bs - 1));
 
+	return 0;
+}
+
+static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
+				      struct snd_pcm_hw_params *params)
+{
+	struct aiu *aiu = snd_soc_component_get_drvdata(component);
+	unsigned int srate = params_rate(params);
+	unsigned int fs, bs;
+	int ret;
+
+	/* Get the oversampling factor */
+	fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);
+
+	if (fs % 64)
+		return -EINVAL;
+
+	/* Send data MSB first */
+	snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
+				      AIU_I2S_DAC_CFG_MSB_FIRST,
+				      AIU_I2S_DAC_CFG_MSB_FIRST);
+
+	/* Set bclk to lrlck ratio */
+	snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
+				      AIU_CODEC_DAC_LRCLK_CTRL_DIV,
+				      FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
+						 64 - 1));
+
+	bs = fs / 64;
+
+	if (aiu->platform->has_clk_ctrl_more_i2s_div)
+		ret = aiu_encoder_i2s_set_more_div(component, params, bs);
+	else
+		ret = aiu_encoder_i2s_set_legacy_div(component, params, bs);
+
+	if (ret)
+		return ret;
+
 	/* Make sure amclk is used for HDMI i2s as well */
 	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
 				      AIU_CLK_CTRL_MORE_HDMI_AMCLK,
diff --git a/sound/soc/meson/aiu.c b/sound/soc/meson/aiu.c
index 38209312a8c3..dc35ca79021c 100644
--- a/sound/soc/meson/aiu.c
+++ b/sound/soc/meson/aiu.c
@@ -351,15 +351,24 @@ static int aiu_remove(struct platform_device *pdev)
 
 static const struct aiu_platform_data aiu_gxbb_pdata = {
 	.has_acodec = false,
+	.has_clk_ctrl_more_i2s_div = true,
 };
 
 static const struct aiu_platform_data aiu_gxl_pdata = {
 	.has_acodec = true,
+	.has_clk_ctrl_more_i2s_div = true,
+};
+
+static const struct aiu_platform_data aiu_meson8_pdata = {
+	.has_acodec = false,
+	.has_clk_ctrl_more_i2s_div = false,
 };
 
 static const struct of_device_id aiu_of_match[] = {
 	{ .compatible = "amlogic,aiu-gxbb", .data = &aiu_gxbb_pdata },
 	{ .compatible = "amlogic,aiu-gxl", .data = &aiu_gxl_pdata },
+	{ .compatible = "amlogic,aiu-meson8", .data = &aiu_meson8_pdata },
+	{ .compatible = "amlogic,aiu-meson8b", .data = &aiu_meson8_pdata },
 	{}
 };
 MODULE_DEVICE_TABLE(of, aiu_of_match);
diff --git a/sound/soc/meson/aiu.h b/sound/soc/meson/aiu.h
index ab003638d5e5..87aa19ac4af3 100644
--- a/sound/soc/meson/aiu.h
+++ b/sound/soc/meson/aiu.h
@@ -29,6 +29,7 @@ struct aiu_interface {
 
 struct aiu_platform_data {
 	bool has_acodec;
+	bool has_clk_ctrl_more_i2s_div;
 };
 
 struct aiu {
-- 
2.25.1


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Re: [PATCH 1/3] ASoC: meson: aiu: Document Meson8 and Meson8b support in the dt-bindings

[Jerome Brunet]

On Thu 20 Feb 2020 at 21:57, Martin Blumenstingl <martin.blumenstingl@googlemail.com> wrote:

> The AIU audio output controller on the Meson8 and Meson8b SoC families
> is compatible with the one found in the GXBB family. Document the
> compatible string for these two older SoCs.
>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>

> ---
>  Documentation/devicetree/bindings/sound/amlogic,aiu.yaml | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/sound/amlogic,aiu.yaml b/Documentation/devicetree/bindings/sound/amlogic,aiu.yaml
> index 3ef7632dcb59..a61bccf915d8 100644
> --- a/Documentation/devicetree/bindings/sound/amlogic,aiu.yaml
> +++ b/Documentation/devicetree/bindings/sound/amlogic,aiu.yaml
> @@ -21,6 +21,8 @@ properties:
>        - enum:
>          - amlogic,aiu-gxbb
>          - amlogic,aiu-gxl
> +        - amlogic,aiu-meson8
> +        - amlogic,aiu-meson8b
>        - const:
>            amlogic,aiu


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Re: [PATCH 2/3] ASoC: meson: aiu: introduce a struct for platform specific information

[Jerome Brunet]

On Thu 20 Feb 2020 at 21:57, Martin Blumenstingl <martin.blumenstingl@googlemail.com> wrote:

> Introduce a struct aiu_platform_data to make the driver aware of
> platform specific information. Convert the existing check for the
> internal stereo audio codec (only available on GXL) to this new struct.
> Support for the 32-bit SoCs will need this as well because the
> AIU_CLK_CTRL_MORE register doesn't have the I2S divider bits (and we
> need to use the I2S divider from AIU_CLK_CTRL instead).
>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>

> ---
>  sound/soc/meson/aiu.c | 19 ++++++++++++++++---
>  sound/soc/meson/aiu.h |  5 +++++
>  2 files changed, 21 insertions(+), 3 deletions(-)
>
> diff --git a/sound/soc/meson/aiu.c b/sound/soc/meson/aiu.c
> index d3e2d40e9562..38209312a8c3 100644
> --- a/sound/soc/meson/aiu.c
> +++ b/sound/soc/meson/aiu.c
> @@ -273,6 +273,11 @@ static int aiu_probe(struct platform_device *pdev)
>  	aiu = devm_kzalloc(dev, sizeof(*aiu), GFP_KERNEL);
>  	if (!aiu)
>  		return -ENOMEM;
> +
> +	aiu->platform = device_get_match_data(dev);
> +	if (!aiu->platform)
> +		return -ENODEV;
> +
>  	platform_set_drvdata(pdev, aiu);
>  
>  	ret = device_reset(dev);
> @@ -322,7 +327,7 @@ static int aiu_probe(struct platform_device *pdev)
>  	}
>  
>  	/* Register the internal dac control component on gxl */
> -	if (of_device_is_compatible(dev->of_node, "amlogic,aiu-gxl")) {
> +	if (aiu->platform->has_acodec) {
>  		ret = aiu_acodec_ctrl_register_component(dev);
>  		if (ret) {
>  			dev_err(dev,
> @@ -344,9 +349,17 @@ static int aiu_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static const struct aiu_platform_data aiu_gxbb_pdata = {
> +	.has_acodec = false,
> +};
> +
> +static const struct aiu_platform_data aiu_gxl_pdata = {
> +	.has_acodec = true,
> +};
> +
>  static const struct of_device_id aiu_of_match[] = {
> -	{ .compatible = "amlogic,aiu-gxbb", },
> -	{ .compatible = "amlogic,aiu-gxl", },
> +	{ .compatible = "amlogic,aiu-gxbb", .data = &aiu_gxbb_pdata },
> +	{ .compatible = "amlogic,aiu-gxl", .data = &aiu_gxl_pdata },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, aiu_of_match);
> diff --git a/sound/soc/meson/aiu.h b/sound/soc/meson/aiu.h
> index 06a968c55728..ab003638d5e5 100644
> --- a/sound/soc/meson/aiu.h
> +++ b/sound/soc/meson/aiu.h
> @@ -27,11 +27,16 @@ struct aiu_interface {
>  	int irq;
>  };
>  
> +struct aiu_platform_data {
> +	bool has_acodec;
> +};
> +
>  struct aiu {
>  	struct clk *pclk;
>  	struct clk *spdif_mclk;
>  	struct aiu_interface i2s;
>  	struct aiu_interface spdif;
> +	const struct aiu_platform_data *platform;
>  };
>  
>  #define AIU_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |	\


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Re: [PATCH 3/3] ASoC: meson: aiu: add support for the Meson8 and Meson8b SoC families

[Jerome Brunet]

On Thu 20 Feb 2020 at 21:57, Martin Blumenstingl <martin.blumenstingl@googlemail.com> wrote:

> The AIU audio controller on the Meson8 and Meson8b SoC families is
> compatible with the one found in the later GXBB family. Add compatible
> strings for these two older SoC families so the driver can be loaded for
> them.
>
> Instead of using the I2S divider from the AIU_CLK_CTRL_MORE register we
> need to use the I2S divider from the AIU_CLK_CTRL register. This older
> register is less flexible because it only supports four divider settings
> (1, 2, 4, 8) compared to the AIU_CLK_CTRL_MORE register (which supports
> dividers in the range 0..64).
>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>

> ---
>  sound/soc/meson/Kconfig           |  2 +-
>  sound/soc/meson/aiu-encoder-i2s.c | 92 +++++++++++++++++++++++--------
>  sound/soc/meson/aiu.c             |  9 +++
>  sound/soc/meson/aiu.h             |  1 +
>  4 files changed, 81 insertions(+), 23 deletions(-)
>
> diff --git a/sound/soc/meson/Kconfig b/sound/soc/meson/Kconfig
> index 897a706dcda0..d27e9180b453 100644
> --- a/sound/soc/meson/Kconfig
> +++ b/sound/soc/meson/Kconfig
> @@ -10,7 +10,7 @@ config SND_MESON_AIU
>  	imply SND_SOC_HDMI_CODEC if DRM_MESON_DW_HDMI
>  	help
>  	  Select Y or M to add support for the Audio output subsystem found
> -	  in the Amlogic GX SoC family
> +	  in the Amlogic Meson8, Meson8b and GX SoC families
>  
>  config SND_MESON_AXG_FIFO
>  	tristate
> diff --git a/sound/soc/meson/aiu-encoder-i2s.c b/sound/soc/meson/aiu-encoder-i2s.c
> index 4900e38e7e49..cc73b5d5c2b7 100644
> --- a/sound/soc/meson/aiu-encoder-i2s.c
> +++ b/sound/soc/meson/aiu-encoder-i2s.c
> @@ -111,34 +111,40 @@ static int aiu_encoder_i2s_setup_desc(struct snd_soc_component *component,
>  	return 0;
>  }
>  
> -static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
> -				      struct snd_pcm_hw_params *params)
> +static int aiu_encoder_i2s_set_legacy_div(struct snd_soc_component *component,
> +					  struct snd_pcm_hw_params *params,
> +					  unsigned int bs)
>  {
> -	struct aiu *aiu = snd_soc_component_get_drvdata(component);
> -	unsigned int srate = params_rate(params);
> -	unsigned int fs, bs;
> -
> -	/* Get the oversampling factor */
> -	fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);
> +	switch (bs) {
> +	case 1:
> +	case 2:
> +	case 4:
> +	case 8:
> +		/* These are the only valid legacy dividers */
> +		break;

I wonder how it will work with the 8ch mode and 16bits but we can deal
with this later on.

>  
> -	if (fs % 64)
> +	default:
> +		dev_err(component->dev, "Unsupported i2s divider: %u\n", bs);
>  		return -EINVAL;
> +	};
>  
> -	/* Send data MSB first */
> -	snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
> -				      AIU_I2S_DAC_CFG_MSB_FIRST,
> -				      AIU_I2S_DAC_CFG_MSB_FIRST);
> +	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
> +				      AIU_CLK_CTRL_I2S_DIV,
> +				      FIELD_PREP(AIU_CLK_CTRL_I2S_DIV,
> +						 __ffs(bs)));
>  
> -	/* Set bclk to lrlck ratio */
> -	snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
> -				      AIU_CODEC_DAC_LRCLK_CTRL_DIV,
> -				      FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
> -						 64 - 1));
> +	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
> +				      AIU_CLK_CTRL_MORE_I2S_DIV,
> +				      FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
> +						 0));
>  
> -	/* Use CLK_MORE for mclk to bclk divider */
> -	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
> -				      AIU_CLK_CTRL_I2S_DIV, 0);
> +	return 0;
> +}
>  
> +static int aiu_encoder_i2s_set_more_div(struct snd_soc_component *component,
> +					struct snd_pcm_hw_params *params,
> +					unsigned int bs)
> +{
>  	/*
>  	 * NOTE: this HW is odd.
>  	 * In most configuration, the i2s divider is 'mclk / blck'.
> @@ -146,7 +152,6 @@ static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
>  	 * increased by 50% to get the correct output rate.
>  	 * No idea why !
>  	 */
> -	bs = fs / 64;
>  	if (params_width(params) == 16 && params_channels(params) == 8) {
>  		if (bs % 2) {
>  			dev_err(component->dev,
> @@ -156,11 +161,54 @@ static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
>  		bs += bs / 2;
>  	}
>  
> +	/* Use CLK_MORE for mclk to bclk divider */
> +	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
> +				      AIU_CLK_CTRL_I2S_DIV,
> +				      FIELD_PREP(AIU_CLK_CTRL_I2S_DIV, 0));
> +
>  	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
>  				      AIU_CLK_CTRL_MORE_I2S_DIV,
>  				      FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
>  						 bs - 1));
>  
> +	return 0;
> +}
> +
> +static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
> +				      struct snd_pcm_hw_params *params)
> +{
> +	struct aiu *aiu = snd_soc_component_get_drvdata(component);
> +	unsigned int srate = params_rate(params);
> +	unsigned int fs, bs;
> +	int ret;
> +
> +	/* Get the oversampling factor */
> +	fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);
> +
> +	if (fs % 64)
> +		return -EINVAL;
> +
> +	/* Send data MSB first */
> +	snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
> +				      AIU_I2S_DAC_CFG_MSB_FIRST,
> +				      AIU_I2S_DAC_CFG_MSB_FIRST);
> +
> +	/* Set bclk to lrlck ratio */
> +	snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
> +				      AIU_CODEC_DAC_LRCLK_CTRL_DIV,
> +				      FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
> +						 64 - 1));
> +
> +	bs = fs / 64;
> +
> +	if (aiu->platform->has_clk_ctrl_more_i2s_div)
> +		ret = aiu_encoder_i2s_set_more_div(component, params, bs);
> +	else
> +		ret = aiu_encoder_i2s_set_legacy_div(component, params, bs);
> +
> +	if (ret)
> +		return ret;
> +
>  	/* Make sure amclk is used for HDMI i2s as well */
>  	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
>  				      AIU_CLK_CTRL_MORE_HDMI_AMCLK,
> diff --git a/sound/soc/meson/aiu.c b/sound/soc/meson/aiu.c
> index 38209312a8c3..dc35ca79021c 100644
> --- a/sound/soc/meson/aiu.c
> +++ b/sound/soc/meson/aiu.c
> @@ -351,15 +351,24 @@ static int aiu_remove(struct platform_device *pdev)
>  
>  static const struct aiu_platform_data aiu_gxbb_pdata = {
>  	.has_acodec = false,
> +	.has_clk_ctrl_more_i2s_div = true,
>  };
>  
>  static const struct aiu_platform_data aiu_gxl_pdata = {
>  	.has_acodec = true,
> +	.has_clk_ctrl_more_i2s_div = true,
> +};
> +
> +static const struct aiu_platform_data aiu_meson8_pdata = {
> +	.has_acodec = false,
> +	.has_clk_ctrl_more_i2s_div = false,
>  };
>  
>  static const struct of_device_id aiu_of_match[] = {
>  	{ .compatible = "amlogic,aiu-gxbb", .data = &aiu_gxbb_pdata },
>  	{ .compatible = "amlogic,aiu-gxl", .data = &aiu_gxl_pdata },
> +	{ .compatible = "amlogic,aiu-meson8", .data = &aiu_meson8_pdata },
> +	{ .compatible = "amlogic,aiu-meson8b", .data = &aiu_meson8_pdata },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, aiu_of_match);
> diff --git a/sound/soc/meson/aiu.h b/sound/soc/meson/aiu.h
> index ab003638d5e5..87aa19ac4af3 100644
> --- a/sound/soc/meson/aiu.h
> +++ b/sound/soc/meson/aiu.h
> @@ -29,6 +29,7 @@ struct aiu_interface {
>  
>  struct aiu_platform_data {
>  	bool has_acodec;
> +	bool has_clk_ctrl_more_i2s_div;
>  };
>  
>  struct aiu {


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Re: [PATCH 3/3] ASoC: meson: aiu: add support for the Meson8 and Meson8b SoC families

[Jerome Brunet]

On Thu 20 Feb 2020 at 21:57, Martin Blumenstingl <martin.blumenstingl@googlemail.com> wrote:

> The AIU audio controller on the Meson8 and Meson8b SoC families is
> compatible with the one found in the later GXBB family. Add compatible
> strings for these two older SoC families so the driver can be loaded for
> them.
>
> Instead of using the I2S divider from the AIU_CLK_CTRL_MORE register we
> need to use the I2S divider from the AIU_CLK_CTRL register. This older
> register is less flexible because it only supports four divider settings
> (1, 2, 4, 8) compared to the AIU_CLK_CTRL_MORE register (which supports
> dividers in the range 0..64).
>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
>  sound/soc/meson/Kconfig           |  2 +-
>  sound/soc/meson/aiu-encoder-i2s.c | 92 +++++++++++++++++++++++--------
>  sound/soc/meson/aiu.c             |  9 +++
>  sound/soc/meson/aiu.h             |  1 +
>  4 files changed, 81 insertions(+), 23 deletions(-)
>
> diff --git a/sound/soc/meson/Kconfig b/sound/soc/meson/Kconfig
> index 897a706dcda0..d27e9180b453 100644
> --- a/sound/soc/meson/Kconfig
> +++ b/sound/soc/meson/Kconfig
> @@ -10,7 +10,7 @@ config SND_MESON_AIU
>  	imply SND_SOC_HDMI_CODEC if DRM_MESON_DW_HDMI
>  	help
>  	  Select Y or M to add support for the Audio output subsystem found
> -	  in the Amlogic GX SoC family
> +	  in the Amlogic Meson8, Meson8b and GX SoC families
>  
>  config SND_MESON_AXG_FIFO
>  	tristate
> diff --git a/sound/soc/meson/aiu-encoder-i2s.c b/sound/soc/meson/aiu-encoder-i2s.c
> index 4900e38e7e49..cc73b5d5c2b7 100644
> --- a/sound/soc/meson/aiu-encoder-i2s.c
> +++ b/sound/soc/meson/aiu-encoder-i2s.c
> @@ -111,34 +111,40 @@ static int aiu_encoder_i2s_setup_desc(struct snd_soc_component *component,
>  	return 0;
>  }
>  
> -static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
> -				      struct snd_pcm_hw_params *params)
> +static int aiu_encoder_i2s_set_legacy_div(struct snd_soc_component *component,
> +					  struct snd_pcm_hw_params *params,
> +					  unsigned int bs)
>  {
> -	struct aiu *aiu = snd_soc_component_get_drvdata(component);
> -	unsigned int srate = params_rate(params);
> -	unsigned int fs, bs;
> -
> -	/* Get the oversampling factor */
> -	fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);
> +	switch (bs) {
> +	case 1:
> +	case 2:
> +	case 4:
> +	case 8:
> +		/* These are the only valid legacy dividers */
> +		break;
>  
> -	if (fs % 64)
> +	default:
> +		dev_err(component->dev, "Unsupported i2s divider: %u\n", bs);
>  		return -EINVAL;
> +	};

Not major but this semicolon should be removed (Thx coccinelle!)

>  
> -	/* Send data MSB first */
> -	snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
> -				      AIU_I2S_DAC_CFG_MSB_FIRST,
> -				      AIU_I2S_DAC_CFG_MSB_FIRST);
> +	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
> +				      AIU_CLK_CTRL_I2S_DIV,
> +				      FIELD_PREP(AIU_CLK_CTRL_I2S_DIV,
> +						 __ffs(bs)));
>  
> -	/* Set bclk to lrlck ratio */
> -	snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
> -				      AIU_CODEC_DAC_LRCLK_CTRL_DIV,
> -				      FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
> -						 64 - 1));
> +	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
> +				      AIU_CLK_CTRL_MORE_I2S_DIV,
> +				      FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
> +						 0));
>  
> -	/* Use CLK_MORE for mclk to bclk divider */
> -	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
> -				      AIU_CLK_CTRL_I2S_DIV, 0);
> +	return 0;
> +}
>  
> +static int aiu_encoder_i2s_set_more_div(struct snd_soc_component *component,
> +					struct snd_pcm_hw_params *params,
> +					unsigned int bs)
> +{
>  	/*
>  	 * NOTE: this HW is odd.
>  	 * In most configuration, the i2s divider is 'mclk / blck'.
> @@ -146,7 +152,6 @@ static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
>  	 * increased by 50% to get the correct output rate.
>  	 * No idea why !
>  	 */
> -	bs = fs / 64;
>  	if (params_width(params) == 16 && params_channels(params) == 8) {
>  		if (bs % 2) {
>  			dev_err(component->dev,
> @@ -156,11 +161,54 @@ static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
>  		bs += bs / 2;
>  	}
>  
> +	/* Use CLK_MORE for mclk to bclk divider */
> +	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
> +				      AIU_CLK_CTRL_I2S_DIV,
> +				      FIELD_PREP(AIU_CLK_CTRL_I2S_DIV, 0));
> +
>  	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
>  				      AIU_CLK_CTRL_MORE_I2S_DIV,
>  				      FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
>  						 bs - 1));
>  
> +	return 0;
> +}
> +
> +static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
> +				      struct snd_pcm_hw_params *params)
> +{
> +	struct aiu *aiu = snd_soc_component_get_drvdata(component);
> +	unsigned int srate = params_rate(params);
> +	unsigned int fs, bs;
> +	int ret;
> +
> +	/* Get the oversampling factor */
> +	fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);
> +
> +	if (fs % 64)
> +		return -EINVAL;
> +
> +	/* Send data MSB first */
> +	snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
> +				      AIU_I2S_DAC_CFG_MSB_FIRST,
> +				      AIU_I2S_DAC_CFG_MSB_FIRST);
> +
> +	/* Set bclk to lrlck ratio */
> +	snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
> +				      AIU_CODEC_DAC_LRCLK_CTRL_DIV,
> +				      FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
> +						 64 - 1));
> +
> +	bs = fs / 64;
> +
> +	if (aiu->platform->has_clk_ctrl_more_i2s_div)
> +		ret = aiu_encoder_i2s_set_more_div(component, params, bs);
> +	else
> +		ret = aiu_encoder_i2s_set_legacy_div(component, params, bs);
> +
> +	if (ret)
> +		return ret;
> +
>  	/* Make sure amclk is used for HDMI i2s as well */
>  	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
>  				      AIU_CLK_CTRL_MORE_HDMI_AMCLK,
> diff --git a/sound/soc/meson/aiu.c b/sound/soc/meson/aiu.c
> index 38209312a8c3..dc35ca79021c 100644
> --- a/sound/soc/meson/aiu.c
> +++ b/sound/soc/meson/aiu.c
> @@ -351,15 +351,24 @@ static int aiu_remove(struct platform_device *pdev)
>  
>  static const struct aiu_platform_data aiu_gxbb_pdata = {
>  	.has_acodec = false,
> +	.has_clk_ctrl_more_i2s_div = true,
>  };
>  
>  static const struct aiu_platform_data aiu_gxl_pdata = {
>  	.has_acodec = true,
> +	.has_clk_ctrl_more_i2s_div = true,
> +};
> +
> +static const struct aiu_platform_data aiu_meson8_pdata = {
> +	.has_acodec = false,
> +	.has_clk_ctrl_more_i2s_div = false,
>  };
>  
>  static const struct of_device_id aiu_of_match[] = {
>  	{ .compatible = "amlogic,aiu-gxbb", .data = &aiu_gxbb_pdata },
>  	{ .compatible = "amlogic,aiu-gxl", .data = &aiu_gxl_pdata },
> +	{ .compatible = "amlogic,aiu-meson8", .data = &aiu_meson8_pdata },
> +	{ .compatible = "amlogic,aiu-meson8b", .data = &aiu_meson8_pdata },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, aiu_of_match);
> diff --git a/sound/soc/meson/aiu.h b/sound/soc/meson/aiu.h
> index ab003638d5e5..87aa19ac4af3 100644
> --- a/sound/soc/meson/aiu.h
> +++ b/sound/soc/meson/aiu.h
> @@ -29,6 +29,7 @@ struct aiu_interface {
>  
>  struct aiu_platform_data {
>  	bool has_acodec;
> +	bool has_clk_ctrl_more_i2s_div;
>  };
>  
>  struct aiu {


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Re: [PATCH 0/3] ASoC: meson: aiu: add Meson8 SoC family support

[patchwork-bot+linux-amlogic]

Hello:

This series was applied to khilman/linux-amlogic.git (refs/heads/for-next).

On Thu, 20 Feb 2020 21:57:08 +0100 you wrote:
> This series adds support for the AIU audio controller found on the
> 32-bit Meson8 and Meson8b SoCs (both seem to use the same revision,
> but for safety reasons we add two compatible strings).
> 
> The only known difference compared to the GX SoCs is the absence of
> the I2S divider in the AIU_CLK_CTRL_MORE register. Instead we have
> to use a less flexible divider.
> 
> [...]


Here is a summary with links:
  - [1/3] ASoC: meson: aiu: Document Meson8 and Meson8b support in the dt-bindings
    https://git.kernel.org/khilman/linux-amlogic/c/62209c9ad2ac29431e91392afb0bd6332ae4c33e
  - [2/3] ASoC: meson: aiu: introduce a struct for platform specific information
    https://git.kernel.org/khilman/linux-amlogic/c/edc761805302db6d63916694d0cdb7468864a47a
  - [3/3] ASoC: meson: aiu: add support for the Meson8 and Meson8b SoC families
    https://git.kernel.org/khilman/linux-amlogic/c/3e25c44598aa44134207ad7b3c5ad6b586135777

You are awesome, thank you!

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Deet-doot-dot, I am a bot.
https://korg.wiki.kernel.org/userdoc/pwbot

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