Re: [PATCH 2/4 v2] drm/bridge: adv7511: Add Audio support.

From: Laurent Pinchart
Date: Tue Aug 30 2016 - 05:21:44 EST

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In reply to: John Stultz: "[PATCH 2/4 v2] drm/bridge: adv7511: Add Audio support."
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Hi John,

Thank you for the patch.

On Monday 29 Aug 2016 16:41:34 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. So credit
> to them, but blame to me.
>
> [1]
> https://github.com/analogdevicesinc/linux/blob/xcomm_zynq/drivers/gpu/drm/i
> 2c/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
> Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
> ---
> v2: Integrated feedback from Srinivas
>
> drivers/gpu/drm/bridge/adv7511/Kconfig | 1 +
> drivers/gpu/drm/bridge/adv7511/Makefile | 2 +-
> drivers/gpu/drm/bridge/adv7511/adv7511.h | 5 +
> drivers/gpu/drm/bridge/adv7511/adv7511_audio.c | 199 ++++++++++++++++++++++
> drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 5 +
> 5 files changed, 211 insertions(+), 1 deletion(-)
> 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..e3975e9 100644
> --- a/drivers/gpu/drm/bridge/adv7511/Kconfig
> +++ b/drivers/gpu/drm/bridge/adv7511/Kconfig
> @@ -3,6 +3,7 @@ config DRM_I2C_ADV7511
> depends on OF
> select DRM_KMS_HELPER
> select REGMAP_I2C
> + select SND_SOC_HDMI_CODEC if SND_SOC

Shouldn't sound support be optional ? I can imagine a board that doesn't wire
up sound to the ADV7511 but still uses SND_SOC for other purposes.

> help
> Support for the Analog Device ADV7511(W) and ADV7513 HDMI encoders.
>
> diff --git a/drivers/gpu/drm/bridge/adv7511/Makefile
> b/drivers/gpu/drm/bridge/adv7511/Makefile index 9019327..ad7245d 100644
> --- a/drivers/gpu/drm/bridge/adv7511/Makefile
> +++ b/drivers/gpu/drm/bridge/adv7511/Makefile
> @@ -1,3 +1,3 @@
> -adv7511-y := adv7511_drv.o
> +adv7511-y := adv7511_drv.o adv7511_audio.o

Could we avoid compiling adv7511_audio.o if sound support isn't desired to
avoid bloating the kernel ?

> 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 c7002a0..2e4d340 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7511.h
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511.h
> @@ -23,6 +23,8 @@ struct adv7511;
>
> int adv7511_packet_enable(struct adv7511 *adv7511, unsigned int packet);
> int adv7511_packet_disable(struct adv7511 *adv7511, unsigned int packet);
> +int adv7511_audio_init(struct device *dev);
> +void adv7511_audio_exit(struct device *dev);
>
> #define ADV7511_REG_CHIP_REVISION 0x00
> #define ADV7511_REG_N0 0x01
> @@ -317,6 +319,8 @@ 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];
> @@ -342,6 +346,7 @@ struct adv7511 {
> bool use_timing_gen;
>
> enum adv7511_type type;
> + struct platform_device *audio_pdev;
> };
>
> #ifdef CONFIG_DRM_I2C_ADV7533
> 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..0e0ea6b
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c
> @@ -0,0 +1,199 @@
> +/*
> + * 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;
> +// case HDMI_SPDIF:
> +// audio_source = ADV7511_AUDIO_SOURCE_SPDIF;
> +// break;

No commented out code please.

> + 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);
> + return 0;
> +}
> +
> +static void audio_shutdown(struct device *dev, void *data)
> +{
> +

No need for a blank line.

> +}
> +
> +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 = dev_get_drvdata(dev);

Why don't you pass the struct adv7511 pointer directly to this function ?

> + 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 device *dev)
> +{
> + struct adv7511 *adv7511 = dev_get_drvdata(dev);

Same here.

> +
> + 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 f8eb7f8..3756994
> 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> @@ -1037,6 +1037,9 @@ static int adv7511_probe(struct i2c_client *i2c, const
> struct i2c_device_id *id) goto err_unregister_cec;
> }
>
> + dev_set_drvdata(dev, adv7511);

This is already handled by the i2c_set_clientdata() call earlier in this
function.

> + adv7511_audio_init(dev);
> +
> return 0;
>
> err_unregister_cec:
> @@ -1058,6 +1061,8 @@ static int adv7511_remove(struct i2c_client *i2c)
>
> drm_bridge_remove(&adv7511->bridge);
>
> + adv7511_audio_exit(&i2c->dev);
> +
> i2c_unregister_device(adv7511->i2c_edid);
>
> kfree(adv7511->edid);

--
Regards,

Laurent Pinchart

Next message: Laurent Pinchart: "Re: [PATCH 0/4 v2] Audio support for adv7511 hdmi bridge"
Previous message: Krzysztof Kozlowski: "[GIT PULL 4/4] ARM: defconfig: Exynos for v4.9"
In reply to: John Stultz: "[PATCH 2/4 v2] drm/bridge: adv7511: Add Audio support."
Next in thread: John Stultz: "[PATCH 4/4 v2] drm/bridge: adv7511: Initialize audio packet on adv7533"
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