This patch adds support to Audio for both adv7511 and adv7533
bridge chips.

This patch was originally from [1] by Lars-Peter Clausen <lars at metafoo.de>
and was adapted by Archit Taneja <architt at codeaurora.org> and
Srinivas Kandagatla <srinivas.kandagatla at linaro.org>.

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/i2c/adv7511_audio.c

Cc: David Airlie <airlied at linux.ie>
Cc: Archit Taneja <architt at codeaurora.org>
Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Cc: Wolfram Sang <wsa+renesas at sang-engineering.com>
Cc: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
Cc: "Ville Syrjälä" <ville.syrjala at linux.intel.com>
Cc: Boris Brezillon <boris.brezillon at free-electrons.com>
Cc: Andy Green <andy at warmcat.com>
Cc: Dave Long <dave.long at linaro.org>
Cc: Guodong Xu <guodong.xu at linaro.org>
Cc: Zhangfei Gao <zhangfei.gao at linaro.org>
Cc: Mark Brown <broonie at kernel.org>
Cc: Lars-Peter Clausen <lars at metafoo.de>
Cc: Jose Abreu <joabreu at synopsys.com>
Cc: dri-devel at lists.freedesktop.org
Signed-off-by: John Stultz <john.stultz at linaro.org>
---
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
        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
 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;
+       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)
+{
+
+}
+
+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);
+
+       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);
+
+       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);
+       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);
-- 
1.9.1

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