drm/bridge: adv7511: Add Audio support

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

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

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@linaro.org>. 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@linux.ie>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
Cc: Boris Brezillon <boris.brezillon@free-electrons.com>
Cc: Andy Green <andy@warmcat.com>
Cc: Dave Long <dave.long@linaro.org>
Cc: Guodong Xu <guodong.xu@linaro.org>
Cc: Zhangfei Gao <zhangfei.gao@linaro.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Jose Abreu <joabreu@synopsys.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: dri-devel@lists.freedesktop.org
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1480382552-28219-2-git-send-email-john.stultz@linaro.org

5 files changed, 242 insertions, 0 deletions

diff --git a/drivers/gpu/drm/bridge/adv7511/Kconfig b/drivers/gpu/drm/bridge/adv7511/Kconfig
index d2b0499ab7d7..2fed567f9943 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 9019327fff4c..5ba675534f6e 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 161c923d6162..992d76ce02bb 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 000000000000..cf92ebfe6ab7
--- /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 8ed3906dd411..8dba729f6ef9 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);