1 /* 2 * Copyright (C) 2013 Red Hat 3 * Author: Rob Clark <robdclark@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include <linux/hdmi.h> 19 #include "hdmi.h" 20 21 /* maps MSM_HDMI_AUDIO_CHANNEL_n consts used by audio driver to # of channels: */ 22 static int nchannels[] = { 2, 4, 6, 8 }; 23 24 /* Supported HDMI Audio sample rates */ 25 #define MSM_HDMI_SAMPLE_RATE_32KHZ 0 26 #define MSM_HDMI_SAMPLE_RATE_44_1KHZ 1 27 #define MSM_HDMI_SAMPLE_RATE_48KHZ 2 28 #define MSM_HDMI_SAMPLE_RATE_88_2KHZ 3 29 #define MSM_HDMI_SAMPLE_RATE_96KHZ 4 30 #define MSM_HDMI_SAMPLE_RATE_176_4KHZ 5 31 #define MSM_HDMI_SAMPLE_RATE_192KHZ 6 32 #define MSM_HDMI_SAMPLE_RATE_MAX 7 33 34 35 struct hdmi_msm_audio_acr { 36 uint32_t n; /* N parameter for clock regeneration */ 37 uint32_t cts; /* CTS parameter for clock regeneration */ 38 }; 39 40 struct hdmi_msm_audio_arcs { 41 unsigned long int pixclock; 42 struct hdmi_msm_audio_acr lut[MSM_HDMI_SAMPLE_RATE_MAX]; 43 }; 44 45 #define HDMI_MSM_AUDIO_ARCS(pclk, ...) { (1000 * (pclk)), __VA_ARGS__ } 46 47 /* Audio constants lookup table for hdmi_msm_audio_acr_setup */ 48 /* Valid Pixel-Clock rates: 25.2MHz, 27MHz, 27.03MHz, 74.25MHz, 148.5MHz */ 49 static const struct hdmi_msm_audio_arcs acr_lut[] = { 50 /* 25.200MHz */ 51 HDMI_MSM_AUDIO_ARCS(25200, { 52 {4096, 25200}, {6272, 28000}, {6144, 25200}, {12544, 28000}, 53 {12288, 25200}, {25088, 28000}, {24576, 25200} }), 54 /* 27.000MHz */ 55 HDMI_MSM_AUDIO_ARCS(27000, { 56 {4096, 27000}, {6272, 30000}, {6144, 27000}, {12544, 30000}, 57 {12288, 27000}, {25088, 30000}, {24576, 27000} }), 58 /* 27.027MHz */ 59 HDMI_MSM_AUDIO_ARCS(27030, { 60 {4096, 27027}, {6272, 30030}, {6144, 27027}, {12544, 30030}, 61 {12288, 27027}, {25088, 30030}, {24576, 27027} }), 62 /* 74.250MHz */ 63 HDMI_MSM_AUDIO_ARCS(74250, { 64 {4096, 74250}, {6272, 82500}, {6144, 74250}, {12544, 82500}, 65 {12288, 74250}, {25088, 82500}, {24576, 74250} }), 66 /* 148.500MHz */ 67 HDMI_MSM_AUDIO_ARCS(148500, { 68 {4096, 148500}, {6272, 165000}, {6144, 148500}, {12544, 165000}, 69 {12288, 148500}, {25088, 165000}, {24576, 148500} }), 70 }; 71 72 static const struct hdmi_msm_audio_arcs *get_arcs(unsigned long int pixclock) 73 { 74 int i; 75 76 for (i = 0; i < ARRAY_SIZE(acr_lut); i++) { 77 const struct hdmi_msm_audio_arcs *arcs = &acr_lut[i]; 78 if (arcs->pixclock == pixclock) 79 return arcs; 80 } 81 82 return NULL; 83 } 84 85 int msm_hdmi_audio_update(struct hdmi *hdmi) 86 { 87 struct hdmi_audio *audio = &hdmi->audio; 88 struct hdmi_audio_infoframe *info = &audio->infoframe; 89 const struct hdmi_msm_audio_arcs *arcs = NULL; 90 bool enabled = audio->enabled; 91 uint32_t acr_pkt_ctrl, vbi_pkt_ctrl, aud_pkt_ctrl; 92 uint32_t infofrm_ctrl, audio_config; 93 94 DBG("audio: enabled=%d, channels=%d, channel_allocation=0x%x, " 95 "level_shift_value=%d, downmix_inhibit=%d, rate=%d", 96 audio->enabled, info->channels, info->channel_allocation, 97 info->level_shift_value, info->downmix_inhibit, audio->rate); 98 DBG("video: power_on=%d, pixclock=%lu", hdmi->power_on, hdmi->pixclock); 99 100 if (enabled && !(hdmi->power_on && hdmi->pixclock)) { 101 DBG("disabling audio: no video"); 102 enabled = false; 103 } 104 105 if (enabled) { 106 arcs = get_arcs(hdmi->pixclock); 107 if (!arcs) { 108 DBG("disabling audio: unsupported pixclock: %lu", 109 hdmi->pixclock); 110 enabled = false; 111 } 112 } 113 114 /* Read first before writing */ 115 acr_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_ACR_PKT_CTRL); 116 vbi_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_VBI_PKT_CTRL); 117 aud_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_AUDIO_PKT_CTRL1); 118 infofrm_ctrl = hdmi_read(hdmi, REG_HDMI_INFOFRAME_CTRL0); 119 audio_config = hdmi_read(hdmi, REG_HDMI_AUDIO_CFG); 120 121 /* Clear N/CTS selection bits */ 122 acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_SELECT__MASK; 123 124 if (enabled) { 125 uint32_t n, cts, multiplier; 126 enum hdmi_acr_cts select; 127 uint8_t buf[14]; 128 129 n = arcs->lut[audio->rate].n; 130 cts = arcs->lut[audio->rate].cts; 131 132 if ((MSM_HDMI_SAMPLE_RATE_192KHZ == audio->rate) || 133 (MSM_HDMI_SAMPLE_RATE_176_4KHZ == audio->rate)) { 134 multiplier = 4; 135 n >>= 2; /* divide N by 4 and use multiplier */ 136 } else if ((MSM_HDMI_SAMPLE_RATE_96KHZ == audio->rate) || 137 (MSM_HDMI_SAMPLE_RATE_88_2KHZ == audio->rate)) { 138 multiplier = 2; 139 n >>= 1; /* divide N by 2 and use multiplier */ 140 } else { 141 multiplier = 1; 142 } 143 144 DBG("n=%u, cts=%u, multiplier=%u", n, cts, multiplier); 145 146 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SOURCE; 147 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_AUDIO_PRIORITY; 148 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_N_MULTIPLIER(multiplier); 149 150 if ((MSM_HDMI_SAMPLE_RATE_48KHZ == audio->rate) || 151 (MSM_HDMI_SAMPLE_RATE_96KHZ == audio->rate) || 152 (MSM_HDMI_SAMPLE_RATE_192KHZ == audio->rate)) 153 select = ACR_48; 154 else if ((MSM_HDMI_SAMPLE_RATE_44_1KHZ == audio->rate) || 155 (MSM_HDMI_SAMPLE_RATE_88_2KHZ == audio->rate) || 156 (MSM_HDMI_SAMPLE_RATE_176_4KHZ == audio->rate)) 157 select = ACR_44; 158 else /* default to 32k */ 159 select = ACR_32; 160 161 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SELECT(select); 162 163 hdmi_write(hdmi, REG_HDMI_ACR_0(select - 1), 164 HDMI_ACR_0_CTS(cts)); 165 hdmi_write(hdmi, REG_HDMI_ACR_1(select - 1), 166 HDMI_ACR_1_N(n)); 167 168 hdmi_write(hdmi, REG_HDMI_AUDIO_PKT_CTRL2, 169 COND(info->channels != 2, HDMI_AUDIO_PKT_CTRL2_LAYOUT) | 170 HDMI_AUDIO_PKT_CTRL2_OVERRIDE); 171 172 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_CONT; 173 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SEND; 174 175 /* configure infoframe: */ 176 hdmi_audio_infoframe_pack(info, buf, sizeof(buf)); 177 hdmi_write(hdmi, REG_HDMI_AUDIO_INFO0, 178 (buf[3] << 0) || (buf[4] << 8) || 179 (buf[5] << 16) || (buf[6] << 24)); 180 hdmi_write(hdmi, REG_HDMI_AUDIO_INFO1, 181 (buf[7] << 0) || (buf[8] << 8)); 182 183 hdmi_write(hdmi, REG_HDMI_GC, 0); 184 185 vbi_pkt_ctrl |= HDMI_VBI_PKT_CTRL_GC_ENABLE; 186 vbi_pkt_ctrl |= HDMI_VBI_PKT_CTRL_GC_EVERY_FRAME; 187 188 aud_pkt_ctrl |= HDMI_AUDIO_PKT_CTRL1_AUDIO_SAMPLE_SEND; 189 190 infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SEND; 191 infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_CONT; 192 infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SOURCE; 193 infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_UPDATE; 194 195 audio_config &= ~HDMI_AUDIO_CFG_FIFO_WATERMARK__MASK; 196 audio_config |= HDMI_AUDIO_CFG_FIFO_WATERMARK(4); 197 audio_config |= HDMI_AUDIO_CFG_ENGINE_ENABLE; 198 } else { 199 acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_CONT; 200 acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_SEND; 201 vbi_pkt_ctrl &= ~HDMI_VBI_PKT_CTRL_GC_ENABLE; 202 vbi_pkt_ctrl &= ~HDMI_VBI_PKT_CTRL_GC_EVERY_FRAME; 203 aud_pkt_ctrl &= ~HDMI_AUDIO_PKT_CTRL1_AUDIO_SAMPLE_SEND; 204 infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SEND; 205 infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_CONT; 206 infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SOURCE; 207 infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_UPDATE; 208 audio_config &= ~HDMI_AUDIO_CFG_ENGINE_ENABLE; 209 } 210 211 hdmi_write(hdmi, REG_HDMI_ACR_PKT_CTRL, acr_pkt_ctrl); 212 hdmi_write(hdmi, REG_HDMI_VBI_PKT_CTRL, vbi_pkt_ctrl); 213 hdmi_write(hdmi, REG_HDMI_AUDIO_PKT_CTRL1, aud_pkt_ctrl); 214 hdmi_write(hdmi, REG_HDMI_INFOFRAME_CTRL0, infofrm_ctrl); 215 216 hdmi_write(hdmi, REG_HDMI_AUD_INT, 217 COND(enabled, HDMI_AUD_INT_AUD_FIFO_URUN_INT) | 218 COND(enabled, HDMI_AUD_INT_AUD_SAM_DROP_INT)); 219 220 hdmi_write(hdmi, REG_HDMI_AUDIO_CFG, audio_config); 221 222 223 DBG("audio %sabled", enabled ? "en" : "dis"); 224 225 return 0; 226 } 227 228 int msm_hdmi_audio_info_setup(struct hdmi *hdmi, bool enabled, 229 uint32_t num_of_channels, uint32_t channel_allocation, 230 uint32_t level_shift, bool down_mix) 231 { 232 struct hdmi_audio *audio; 233 234 if (!hdmi) 235 return -ENXIO; 236 237 audio = &hdmi->audio; 238 239 if (num_of_channels >= ARRAY_SIZE(nchannels)) 240 return -EINVAL; 241 242 audio->enabled = enabled; 243 audio->infoframe.channels = nchannels[num_of_channels]; 244 audio->infoframe.channel_allocation = channel_allocation; 245 audio->infoframe.level_shift_value = level_shift; 246 audio->infoframe.downmix_inhibit = down_mix; 247 248 return msm_hdmi_audio_update(hdmi); 249 } 250 251 void msm_hdmi_audio_set_sample_rate(struct hdmi *hdmi, int rate) 252 { 253 struct hdmi_audio *audio; 254 255 if (!hdmi) 256 return; 257 258 audio = &hdmi->audio; 259 260 if ((rate < 0) || (rate >= MSM_HDMI_SAMPLE_RATE_MAX)) 261 return; 262 263 audio->rate = rate; 264 msm_hdmi_audio_update(hdmi); 265 } 266