adv7511_audio.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Analog Devices ADV7511 HDMI transmitter driver
  4 *
  5 * Copyright 2012 Analog Devices Inc.
  6 * Copyright (c) 2016, Linaro Limited
  7 */
  8
  9#include <sound/core.h>
 10#include <sound/hdmi-codec.h>
 11#include <sound/pcm.h>
 12#include <sound/soc.h>
 13#include <linux/of_graph.h>
 14
 15#include <drm/display/drm_hdmi_state_helper.h>
 16
 17#include "adv7511.h"
 18
 19static void adv7511_calc_cts_n(unsigned int f_tmds, unsigned int fs,
 20			       unsigned int *cts, unsigned int *n)
 21{
 22	switch (fs) {
 23	case 32000:
 24	case 48000:
 25	case 96000:
 26	case 192000:
 27		*n = fs * 128 / 1000;
 28		break;
 29	case 44100:
 30	case 88200:
 31	case 176400:
 32		*n = fs * 128 / 900;
 33		break;
 34	}
 35
 36	*cts = ((f_tmds * *n) / (128 * fs)) * 1000;
 37}
 38
 39static int adv7511_update_cts_n(struct adv7511 *adv7511)
 40{
 41	unsigned int cts = 0;
 42	unsigned int n = 0;
 43
 44	adv7511_calc_cts_n(adv7511->f_tmds, adv7511->f_audio, &cts, &n);
 45
 46	regmap_write(adv7511->regmap, ADV7511_REG_N0, (n >> 16) & 0xf);
 47	regmap_write(adv7511->regmap, ADV7511_REG_N1, (n >> 8) & 0xff);
 48	regmap_write(adv7511->regmap, ADV7511_REG_N2, n & 0xff);
 49
 50	regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL0,
 51		     (cts >> 16) & 0xf);
 52	regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL1,
 53		     (cts >> 8) & 0xff);
 54	regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL2,
 55		     cts & 0xff);
 56
 57	return 0;
 58}
 59
 60int adv7511_hdmi_audio_prepare(struct drm_bridge *bridge,
 61			       struct drm_connector *connector,
 62			       struct hdmi_codec_daifmt *fmt,
 63			       struct hdmi_codec_params *hparms)
 64{
 65	struct adv7511 *adv7511 = bridge_to_adv7511(bridge);
 66	unsigned int audio_source, i2s_format = 0;
 67	unsigned int invert_clock;
 68	unsigned int rate;
 69	unsigned int len;
 70
 71	switch (hparms->sample_rate) {
 72	case 32000:
 73		rate = ADV7511_SAMPLE_FREQ_32000;
 74		break;
 75	case 44100:
 76		rate = ADV7511_SAMPLE_FREQ_44100;
 77		break;
 78	case 48000:
 79		rate = ADV7511_SAMPLE_FREQ_48000;
 80		break;
 81	case 88200:
 82		rate = ADV7511_SAMPLE_FREQ_88200;
 83		break;
 84	case 96000:
 85		rate = ADV7511_SAMPLE_FREQ_96000;
 86		break;
 87	case 176400:
 88		rate = ADV7511_SAMPLE_FREQ_176400;
 89		break;
 90	case 192000:
 91		rate = ADV7511_SAMPLE_FREQ_192000;
 92		break;
 93	default:
 94		return -EINVAL;
 95	}
 96
 97	switch (hparms->sample_width) {
 98	case 16:
 99		len = ADV7511_I2S_SAMPLE_LEN_16;
100		break;
101	case 18:
102		len = ADV7511_I2S_SAMPLE_LEN_18;
103		break;
104	case 20:
105		len = ADV7511_I2S_SAMPLE_LEN_20;
106		break;
107	case 32:
108		if (fmt->bit_fmt != SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
109			return -EINVAL;
110		fallthrough;
111	case 24:
112		len = ADV7511_I2S_SAMPLE_LEN_24;
113		break;
114	default:
115		return -EINVAL;
116	}
117
118	switch (fmt->fmt) {
119	case HDMI_I2S:
120		audio_source = ADV7511_AUDIO_SOURCE_I2S;
121		i2s_format = ADV7511_I2S_FORMAT_I2S;
122		if (fmt->bit_fmt == SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
123			i2s_format = ADV7511_I2S_IEC958_DIRECT;
124		break;
125	case HDMI_RIGHT_J:
126		audio_source = ADV7511_AUDIO_SOURCE_I2S;
127		i2s_format = ADV7511_I2S_FORMAT_RIGHT_J;
128		break;
129	case HDMI_LEFT_J:
130		audio_source = ADV7511_AUDIO_SOURCE_I2S;
131		i2s_format = ADV7511_I2S_FORMAT_LEFT_J;
132		break;
133	case HDMI_SPDIF:
134		audio_source = ADV7511_AUDIO_SOURCE_SPDIF;
135		break;
136	default:
137		return -EINVAL;
138	}
139
140	invert_clock = fmt->bit_clk_inv;
141
142	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_SOURCE, 0x70,
143			   audio_source << 4);
144	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG, BIT(6),
145			   invert_clock << 6);
146	regmap_update_bits(adv7511->regmap, ADV7511_REG_I2S_CONFIG, 0x03,
147			   i2s_format);
148
149	adv7511->audio_source = audio_source;
150
151	adv7511->f_audio = hparms->sample_rate;
152
153	adv7511_update_cts_n(adv7511);
154
155	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CFG3,
156			   ADV7511_AUDIO_CFG3_LEN_MASK, len);
157	regmap_update_bits(adv7511->regmap, ADV7511_REG_I2C_FREQ_ID_CFG,
158			   ADV7511_I2C_FREQ_ID_CFG_RATE_MASK, rate << 4);
159
160	return drm_atomic_helper_connector_hdmi_update_audio_infoframe(connector,
161								       &hparms->cea);
162}
163
164int adv7511_hdmi_audio_startup(struct drm_bridge *bridge,
165			       struct drm_connector *connector)
166{
167	struct adv7511 *adv7511 = bridge_to_adv7511(bridge);
168
169	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG,
170				BIT(7), 0);
171
172	/* hide Audio infoframe updates */
173	regmap_update_bits(adv7511->regmap, ADV7511_REG_INFOFRAME_UPDATE,
174				BIT(5), BIT(5));
175	/* enable N/CTS, enable Audio sample packets */
176	regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
177				BIT(5), BIT(5));
178	/* enable N/CTS */
179	regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
180				BIT(6), BIT(6));
181	/* not copyrighted */
182	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CFG1,
183				BIT(5), BIT(5));
184	/* AV mute disable */
185	regmap_update_bits(adv7511->regmap, ADV7511_REG_GC(0),
186				BIT(7) | BIT(6), BIT(7));
187
188	/* enable SPDIF receiver */
189	if (adv7511->audio_source == ADV7511_AUDIO_SOURCE_SPDIF)
190		regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG,
191				   BIT(7), BIT(7));
192
193	return 0;
194}
195
196void adv7511_hdmi_audio_shutdown(struct drm_bridge *bridge,
197				 struct drm_connector *connector)
198{
199	struct adv7511 *adv7511 = bridge_to_adv7511(bridge);
200
201	if (adv7511->audio_source == ADV7511_AUDIO_SOURCE_SPDIF)
202		regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG,
203				   BIT(7), 0);
204
205	drm_atomic_helper_connector_hdmi_clear_audio_infoframe(connector);
206}