Re: [PATCH 1/2 v4] drm/bridge: adv7511: Add Audio support.

Archit Taneja <architt@xxxxxxxxxxxxxx> · Fri, 23 Sep 2016 14:54:13 +0530

On 09/17/2016 04:47 AM, John Stultz wrote:
This patch adds support to Audio for both adv7511 and adv7533
bridge chips.

This patch was originally from [1] by Lars-Peter Clausen <lars@xxxxxxxxxx>
and was adapted by Archit Taneja <architt@xxxxxxxxxxxxxx> and
Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>.

Then I heavily reworked it to use the hdmi-codec driver. And also
folded in some audio packet initialization done by Andy Green
<andy.green@xxxxxxxxxx>. So credit to them, but blame to me.

[1] https://github.com/analogdevicesinc/linux/blob/xcomm_zynq/drivers/gpu/drm/i2c/adv7511_audio.c

Cc: David Airlie <airlied@xxxxxxxx>
Cc: Archit Taneja <architt@xxxxxxxxxxxxxx>
Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Cc: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Cc: "Ville Syrjälä" <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Cc: Andy Green <andy@xxxxxxxxxxx>
Cc: Dave Long <dave.long@xxxxxxxxxx>
Cc: Guodong Xu <guodong.xu@xxxxxxxxxx>
Cc: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Lars-Peter Clausen <lars@xxxxxxxxxx>
Cc: Jose Abreu <joabreu@xxxxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Acked-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>

Reviewed-by: Archit Taneja <architt@xxxxxxxxxxxxxx>

---
v4:
* Kconfig tweaks suggested by Lars-Peter Clausen
v3:
* Allowed audio support to be configured in or out, as suggested by Laurent
* Minor cleanups suggested by Laurent
* Folded in Andy's audio packet initialization patch, as suggested by Archit

drivers/gpu/drm/bridge/adv7511/Kconfig         |   8 +
 drivers/gpu/drm/bridge/adv7511/Makefile        |   1 +
 drivers/gpu/drm/bridge/adv7511/adv7511.h       |  16 ++
 drivers/gpu/drm/bridge/adv7511/adv7511_audio.c | 213 +++++++++++++++++++++++++
 drivers/gpu/drm/bridge/adv7511/adv7511_drv.c   |   4 +
 5 files changed, 242 insertions(+)
 create mode 100644 drivers/gpu/drm/bridge/adv7511/adv7511_audio.c

diff --git a/drivers/gpu/drm/bridge/adv7511/Kconfig b/drivers/gpu/drm/bridge/adv7511/Kconfig
index d2b0499..2fed567 100644
--- a/drivers/gpu/drm/bridge/adv7511/Kconfig
+++ b/drivers/gpu/drm/bridge/adv7511/Kconfig
@@ -6,6 +6,14 @@ config DRM_I2C_ADV7511
 	help
 	  Support for the Analog Device ADV7511(W) and ADV7513 HDMI encoders.

+config DRM_I2C_ADV7511_AUDIO
+	bool "ADV7511 HDMI Audio driver"
+	depends on DRM_I2C_ADV7511 && SND_SOC
+	select SND_SOC_HDMI_CODEC
+	help
+	  Support the ADV7511 HDMI Audio interface. This is used in
+	  conjunction with the AV7511  HDMI driver.
+
 config DRM_I2C_ADV7533
 	bool "ADV7533 encoder"
 	depends on DRM_I2C_ADV7511
diff --git a/drivers/gpu/drm/bridge/adv7511/Makefile b/drivers/gpu/drm/bridge/adv7511/Makefile
index 9019327..5ba6755 100644
--- a/drivers/gpu/drm/bridge/adv7511/Makefile
+++ b/drivers/gpu/drm/bridge/adv7511/Makefile
@@ -1,3 +1,4 @@
 adv7511-y := adv7511_drv.o
+adv7511-$(CONFIG_DRM_I2C_ADV7511_AUDIO) += adv7511_audio.o
 adv7511-$(CONFIG_DRM_I2C_ADV7533) += adv7533.o
 obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511.o
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511.h b/drivers/gpu/drm/bridge/adv7511/adv7511.h
index 161c923..992d76c 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511.h
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511.h
@@ -309,6 +309,8 @@ struct adv7511 {
 	struct drm_display_mode curr_mode;

 	unsigned int f_tmds;
+	unsigned int f_audio;
+	unsigned int audio_source;

 	unsigned int current_edid_segment;
 	uint8_t edid_buf[256];
@@ -334,6 +336,7 @@ struct adv7511 {
 	bool use_timing_gen;

 	enum adv7511_type type;
+	struct platform_device *audio_pdev;
 };

 #ifdef CONFIG_DRM_I2C_ADV7533
@@ -389,4 +392,17 @@ static inline int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
 }
 #endif

+#ifdef CONFIG_DRM_I2C_ADV7511_AUDIO
+int adv7511_audio_init(struct device *dev, struct adv7511 *adv7511);
+void adv7511_audio_exit(struct adv7511 *adv7511);
+#else /*CONFIG_DRM_I2C_ADV7511_AUDIO */
+static inline int adv7511_audio_init(struct device *dev, struct adv7511 *adv7511)
+{
+	return 0;
+}
+static inline void adv7511_audio_exit(struct adv7511 *adv7511)
+{
+}
+#endif /* CONFIG_DRM_I2C_ADV7511_AUDIO */
+
 #endif /* __DRM_I2C_ADV7511_H__ */
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c b/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c
new file mode 100644
index 0000000..5ce29a5
--- /dev/null
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c
@@ -0,0 +1,213 @@
+/*
+ * Analog Devices ADV7511 HDMI transmitter driver
+ *
+ * Copyright 2012 Analog Devices Inc.
+ * Copyright (c) 2016, Linaro Limited
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <sound/core.h>
+#include <sound/hdmi-codec.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+
+#include "adv7511.h"
+
+static void adv7511_calc_cts_n(unsigned int f_tmds, unsigned int fs,
+			       unsigned int *cts, unsigned int *n)
+{
+	switch (fs) {
+	case 32000:
+		*n = 4096;
+		break;
+	case 44100:
+		*n = 6272;
+		break;
+	case 48000:
+		*n = 6144;
+		break;
+	}
+
+	*cts = ((f_tmds * *n) / (128 * fs)) * 1000;
+}
+
+static int adv7511_update_cts_n(struct adv7511 *adv7511)
+{
+	unsigned int cts = 0;
+	unsigned int n = 0;
+
+	adv7511_calc_cts_n(adv7511->f_tmds, adv7511->f_audio, &cts, &n);
+
+	regmap_write(adv7511->regmap, ADV7511_REG_N0, (n >> 16) & 0xf);
+	regmap_write(adv7511->regmap, ADV7511_REG_N1, (n >> 8) & 0xff);
+	regmap_write(adv7511->regmap, ADV7511_REG_N2, n & 0xff);
+
+	regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL0,
+		     (cts >> 16) & 0xf);
+	regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL1,
+		     (cts >> 8) & 0xff);
+	regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL2,
+		     cts & 0xff);
+
+	return 0;
+}
+
+int adv7511_hdmi_hw_params(struct device *dev, void *data,
+				struct hdmi_codec_daifmt *fmt,
+				struct hdmi_codec_params *hparms)
+{
+	struct adv7511 *adv7511 = dev_get_drvdata(dev);
+	unsigned int audio_source, i2s_format = 0;
+	unsigned int invert_clock;
+	unsigned int rate;
+	unsigned int len;
+
+	switch (hparms->sample_rate) {
+	case 32000:
+		rate = ADV7511_SAMPLE_FREQ_32000;
+		break;
+	case 44100:
+		rate = ADV7511_SAMPLE_FREQ_44100;
+		break;
+	case 48000:
+		rate = ADV7511_SAMPLE_FREQ_48000;
+		break;
+	case 88200:
+		rate = ADV7511_SAMPLE_FREQ_88200;
+		break;
+	case 96000:
+		rate = ADV7511_SAMPLE_FREQ_96000;
+		break;
+	case 176400:
+		rate = ADV7511_SAMPLE_FREQ_176400;
+		break;
+	case 192000:
+		rate = ADV7511_SAMPLE_FREQ_192000;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (hparms->sample_width) {
+	case 16:
+		len = ADV7511_I2S_SAMPLE_LEN_16;
+		break;
+	case 18:
+		len = ADV7511_I2S_SAMPLE_LEN_18;
+		break;
+	case 20:
+		len = ADV7511_I2S_SAMPLE_LEN_20;
+		break;
+	case 24:
+		len = ADV7511_I2S_SAMPLE_LEN_24;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (fmt->fmt) {
+	case HDMI_I2S:
+		audio_source = ADV7511_AUDIO_SOURCE_I2S;
+		i2s_format = ADV7511_I2S_FORMAT_I2S;
+		break;
+	case HDMI_RIGHT_J:
+		audio_source = ADV7511_AUDIO_SOURCE_I2S;
+		i2s_format = ADV7511_I2S_FORMAT_RIGHT_J;
+		break;
+	case HDMI_LEFT_J:
+		audio_source = ADV7511_AUDIO_SOURCE_I2S;
+		i2s_format = ADV7511_I2S_FORMAT_LEFT_J;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	invert_clock = fmt->bit_clk_inv;
+
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_SOURCE, 0x70,
+			   audio_source << 4);
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG, BIT(6),
+			   invert_clock << 6);
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_I2S_CONFIG, 0x03,
+			   i2s_format);
+
+	adv7511->audio_source = audio_source;
+
+	adv7511->f_audio = hparms->sample_rate;
+
+	adv7511_update_cts_n(adv7511);
+
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CFG3,
+			   ADV7511_AUDIO_CFG3_LEN_MASK, len);
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_I2C_FREQ_ID_CFG,
+			   ADV7511_I2C_FREQ_ID_CFG_RATE_MASK, rate << 4);
+	regmap_write(adv7511->regmap, 0x73, 0x1);
+
+	return 0;
+}
+
+static int audio_startup(struct device *dev, void *data)
+{
+	struct adv7511 *adv7511 = dev_get_drvdata(dev);
+
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG,
+				BIT(7), 0);
+
+	/* hide Audio infoframe updates */
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_INFOFRAME_UPDATE,
+				BIT(5), BIT(5));
+	/* enable N/CTS, enable Audio sample packets */
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
+				BIT(5), BIT(5));
+	/* enable N/CTS */
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
+				BIT(6), BIT(6));
+	/* not copyrighted */
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CFG1,
+				BIT(5), BIT(5));
+	/* enable audio infoframes */
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
+				BIT(3), BIT(3));
+	/* AV mute disable */
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_GC(0),
+				BIT(7) | BIT(6), BIT(7));
+	/* use Audio infoframe updated info */
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_GC(1),
+				BIT(5), 0);
+	return 0;
+}
+
+static void audio_shutdown(struct device *dev, void *data)
+{
+}
+
+static const struct hdmi_codec_ops adv7511_codec_ops = {
+	.hw_params	= adv7511_hdmi_hw_params,
+	.audio_shutdown = audio_shutdown,
+	.audio_startup	= audio_startup,
+};
+
+static struct hdmi_codec_pdata codec_data = {
+	.ops = &adv7511_codec_ops,
+	.max_i2s_channels = 2,
+	.i2s = 1,
+};
+
+int adv7511_audio_init(struct device *dev, struct adv7511 *adv7511)
+{
+	adv7511->audio_pdev = platform_device_register_data(dev,
+					HDMI_CODEC_DRV_NAME,
+					PLATFORM_DEVID_AUTO,
+					&codec_data,
+					sizeof(codec_data));
+	return PTR_ERR_OR_ZERO(adv7511->audio_pdev);
+}
+
+void adv7511_audio_exit(struct adv7511 *adv7511)
+{
+	if (adv7511->audio_pdev) {
+		platform_device_unregister(adv7511->audio_pdev);
+		adv7511->audio_pdev = NULL;
+	}
+}
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index ec8fb2e..d0b0c6a 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -1037,6 +1037,8 @@ static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 		goto err_unregister_cec;
 	}

+	adv7511_audio_init(dev, adv7511);
+
 	return 0;

 err_unregister_cec:
@@ -1058,6 +1060,8 @@ static int adv7511_remove(struct i2c_client *i2c)

 	drm_bridge_remove(&adv7511->bridge);

+	adv7511_audio_exit(adv7511);
+
 	i2c_unregister_device(adv7511->i2c_edid);

 	kfree(adv7511->edid);


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