drivers/gpu/drm/msm/hdmi/hdmi_audio.c

   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
  22 /* Supported HDMI Audio channels */
  23 #define MSM_HDMI_AUDIO_CHANNEL_2                0
  24 #define MSM_HDMI_AUDIO_CHANNEL_4                1
  25 #define MSM_HDMI_AUDIO_CHANNEL_6                2
  26 #define MSM_HDMI_AUDIO_CHANNEL_8                3
  27
  28 /* maps MSM_HDMI_AUDIO_CHANNEL_n consts used by audio driver to # of channels: */
  29 static int nchannels[] = { 2, 4, 6, 8 };
  30
  31 /* Supported HDMI Audio sample rates */
  32 #define MSM_HDMI_SAMPLE_RATE_32KHZ              0
  33 #define MSM_HDMI_SAMPLE_RATE_44_1KHZ            1
  34 #define MSM_HDMI_SAMPLE_RATE_48KHZ              2
  35 #define MSM_HDMI_SAMPLE_RATE_88_2KHZ            3
  36 #define MSM_HDMI_SAMPLE_RATE_96KHZ              4
  37 #define MSM_HDMI_SAMPLE_RATE_176_4KHZ           5
  38 #define MSM_HDMI_SAMPLE_RATE_192KHZ             6
  39 #define MSM_HDMI_SAMPLE_RATE_MAX                7
  40
  41
  42 struct hdmi_msm_audio_acr {
  43         uint32_t n;     /* N parameter for clock regeneration */
  44         uint32_t cts;   /* CTS parameter for clock regeneration */
  45 };
  46
  47 struct hdmi_msm_audio_arcs {
  48         unsigned long int pixclock;
  49         struct hdmi_msm_audio_acr lut[MSM_HDMI_SAMPLE_RATE_MAX];
  50 };
  51
  52 #define HDMI_MSM_AUDIO_ARCS(pclk, ...) { (1000 * (pclk)), __VA_ARGS__ }
  53
  54 /* Audio constants lookup table for hdmi_msm_audio_acr_setup */
  55 /* Valid Pixel-Clock rates: 25.2MHz, 27MHz, 27.03MHz, 74.25MHz, 148.5MHz */
  56 static const struct hdmi_msm_audio_arcs acr_lut[] = {
  57         /*  25.200MHz  */
  58         HDMI_MSM_AUDIO_ARCS(25200, {
  59                 {4096, 25200}, {6272, 28000}, {6144, 25200}, {12544, 28000},
  60                 {12288, 25200}, {25088, 28000}, {24576, 25200} }),
  61         /*  27.000MHz  */
  62         HDMI_MSM_AUDIO_ARCS(27000, {
  63                 {4096, 27000}, {6272, 30000}, {6144, 27000}, {12544, 30000},
  64                 {12288, 27000}, {25088, 30000}, {24576, 27000} }),
  65         /*  27.027MHz */
  66         HDMI_MSM_AUDIO_ARCS(27030, {
  67                 {4096, 27027}, {6272, 30030}, {6144, 27027}, {12544, 30030},
  68                 {12288, 27027}, {25088, 30030}, {24576, 27027} }),
  69         /*  74.250MHz */
  70         HDMI_MSM_AUDIO_ARCS(74250, {
  71                 {4096, 74250}, {6272, 82500}, {6144, 74250}, {12544, 82500},
  72                 {12288, 74250}, {25088, 82500}, {24576, 74250} }),
  73         /* 148.500MHz */
  74         HDMI_MSM_AUDIO_ARCS(148500, {
  75                 {4096, 148500}, {6272, 165000}, {6144, 148500}, {12544, 165000},
  76                 {12288, 148500}, {25088, 165000}, {24576, 148500} }),
  77 };
  78
  79 static const struct hdmi_msm_audio_arcs *get_arcs(unsigned long int pixclock)
  80 {
  81         int i;
  82
  83         for (i = 0; i < ARRAY_SIZE(acr_lut); i++) {
  84                 const struct hdmi_msm_audio_arcs *arcs = &acr_lut[i];
  85                 if (arcs->pixclock == pixclock)
  86                         return arcs;
  87         }
  88
  89         return NULL;
  90 }
  91
  92 int hdmi_audio_update(struct hdmi *hdmi)
  93 {
  94         struct hdmi_audio *audio = &hdmi->audio;
  95         struct hdmi_audio_infoframe *info = &audio->infoframe;
  96         const struct hdmi_msm_audio_arcs *arcs = NULL;
  97         bool enabled = audio->enabled;
  98         uint32_t acr_pkt_ctrl, vbi_pkt_ctrl, aud_pkt_ctrl;
  99         uint32_t infofrm_ctrl, audio_config;
 100
 101         DBG("audio: enabled=%d, channels=%d, channel_allocation=0x%x, "
 102                 "level_shift_value=%d, downmix_inhibit=%d, rate=%d",
 103                 audio->enabled, info->channels,  info->channel_allocation,
 104                 info->level_shift_value, info->downmix_inhibit, audio->rate);
 105         DBG("video: power_on=%d, pixclock=%lu", hdmi->power_on, hdmi->pixclock);
 106
 107         if (enabled && !(hdmi->power_on && hdmi->pixclock)) {
 108                 DBG("disabling audio: no video");
 109                 enabled = false;
 110         }
 111
 112         if (enabled) {
 113                 arcs = get_arcs(hdmi->pixclock);
 114                 if (!arcs) {
 115                         DBG("disabling audio: unsupported pixclock: %lu",
 116                                         hdmi->pixclock);
 117                         enabled = false;
 118                 }
 119         }
 120
 121         /* Read first before writing */
 122         acr_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_ACR_PKT_CTRL);
 123         vbi_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_VBI_PKT_CTRL);
 124         aud_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_AUDIO_PKT_CTRL1);
 125         infofrm_ctrl = hdmi_read(hdmi, REG_HDMI_INFOFRAME_CTRL0);
 126         audio_config = hdmi_read(hdmi, REG_HDMI_AUDIO_CFG);
 127
 128         /* Clear N/CTS selection bits */
 129         acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_SELECT__MASK;
 130
 131         if (enabled) {
 132                 uint32_t n, cts, multiplier;
 133                 enum hdmi_acr_cts select;
 134                 uint8_t buf[14];
 135
 136                 n   = arcs->lut[audio->rate].n;
 137                 cts = arcs->lut[audio->rate].cts;
 138
 139                 if ((MSM_HDMI_SAMPLE_RATE_192KHZ == audio->rate) ||
 140                                 (MSM_HDMI_SAMPLE_RATE_176_4KHZ == audio->rate)) {
 141                         multiplier = 4;
 142                         n >>= 2; /* divide N by 4 and use multiplier */
 143                 } else if ((MSM_HDMI_SAMPLE_RATE_96KHZ == audio->rate) ||
 144                                 (MSM_HDMI_SAMPLE_RATE_88_2KHZ == audio->rate)) {
 145                         multiplier = 2;
 146                         n >>= 1; /* divide N by 2 and use multiplier */
 147                 } else {
 148                         multiplier = 1;
 149                 }
 150
 151                 DBG("n=%u, cts=%u, multiplier=%u", n, cts, multiplier);
 152
 153                 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SOURCE;
 154                 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_AUDIO_PRIORITY;
 155                 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_N_MULTIPLIER(multiplier);
 156
 157                 if ((MSM_HDMI_SAMPLE_RATE_48KHZ == audio->rate) ||
 158                                 (MSM_HDMI_SAMPLE_RATE_96KHZ == audio->rate) ||
 159                                 (MSM_HDMI_SAMPLE_RATE_192KHZ == audio->rate))
 160                         select = ACR_48;
 161                 else if ((MSM_HDMI_SAMPLE_RATE_44_1KHZ == audio->rate) ||
 162                                 (MSM_HDMI_SAMPLE_RATE_88_2KHZ == audio->rate) ||
 163                                 (MSM_HDMI_SAMPLE_RATE_176_4KHZ == audio->rate))
 164                         select = ACR_44;
 165                 else /* default to 32k */
 166                         select = ACR_32;
 167
 168                 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SELECT(select);
 169
 170                 hdmi_write(hdmi, REG_HDMI_ACR_0(select - 1),
 171                                 HDMI_ACR_0_CTS(cts));
 172                 hdmi_write(hdmi, REG_HDMI_ACR_1(select - 1),
 173                                 HDMI_ACR_1_N(n));
 174
 175                 hdmi_write(hdmi, REG_HDMI_AUDIO_PKT_CTRL2,
 176                                 COND(info->channels != 2, HDMI_AUDIO_PKT_CTRL2_LAYOUT) |
 177                                 HDMI_AUDIO_PKT_CTRL2_OVERRIDE);
 178
 179                 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_CONT;
 180                 acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SEND;
 181
 182                 /* configure infoframe: */
 183                 hdmi_audio_infoframe_pack(info, buf, sizeof(buf));
 184                 hdmi_write(hdmi, REG_HDMI_AUDIO_INFO0,
 185                                 (buf[3] <<  0) || (buf[4] <<  8) ||
 186                                 (buf[5] << 16) || (buf[6] << 24));
 187                 hdmi_write(hdmi, REG_HDMI_AUDIO_INFO1,
 188                                 (buf[7] <<  0) || (buf[8] << 8));
 189
 190                 hdmi_write(hdmi, REG_HDMI_GC, 0);
 191
 192                 vbi_pkt_ctrl |= HDMI_VBI_PKT_CTRL_GC_ENABLE;
 193                 vbi_pkt_ctrl |= HDMI_VBI_PKT_CTRL_GC_EVERY_FRAME;
 194
 195                 aud_pkt_ctrl |= HDMI_AUDIO_PKT_CTRL1_AUDIO_SAMPLE_SEND;
 196
 197                 infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SEND;
 198                 infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_CONT;
 199                 infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SOURCE;
 200                 infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_UPDATE;
 201
 202                 audio_config &= ~HDMI_AUDIO_CFG_FIFO_WATERMARK__MASK;
 203                 audio_config |= HDMI_AUDIO_CFG_FIFO_WATERMARK(4);
 204                 audio_config |= HDMI_AUDIO_CFG_ENGINE_ENABLE;
 205         } else {
 206                 acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_CONT;
 207                 acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_SEND;
 208                 vbi_pkt_ctrl &= ~HDMI_VBI_PKT_CTRL_GC_ENABLE;
 209                 vbi_pkt_ctrl &= ~HDMI_VBI_PKT_CTRL_GC_EVERY_FRAME;
 210                 aud_pkt_ctrl &= ~HDMI_AUDIO_PKT_CTRL1_AUDIO_SAMPLE_SEND;
 211                 infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SEND;
 212                 infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_CONT;
 213                 infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SOURCE;
 214                 infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_UPDATE;
 215                 audio_config &= ~HDMI_AUDIO_CFG_ENGINE_ENABLE;
 216         }
 217
 218         hdmi_write(hdmi, REG_HDMI_ACR_PKT_CTRL, acr_pkt_ctrl);
 219         hdmi_write(hdmi, REG_HDMI_VBI_PKT_CTRL, vbi_pkt_ctrl);
 220         hdmi_write(hdmi, REG_HDMI_AUDIO_PKT_CTRL1, aud_pkt_ctrl);
 221         hdmi_write(hdmi, REG_HDMI_INFOFRAME_CTRL0, infofrm_ctrl);
 222
 223         hdmi_write(hdmi, REG_HDMI_AUD_INT,
 224                         COND(enabled, HDMI_AUD_INT_AUD_FIFO_URUN_INT) |
 225                         COND(enabled, HDMI_AUD_INT_AUD_SAM_DROP_INT));
 226
 227         hdmi_write(hdmi, REG_HDMI_AUDIO_CFG, audio_config);
 228
 229
 230         DBG("audio %sabled", enabled ? "en" : "dis");
 231
 232         return 0;
 233 }
 234
 235 int hdmi_audio_info_setup(struct hdmi *hdmi, bool enabled,
 236         uint32_t num_of_channels, uint32_t channel_allocation,
 237         uint32_t level_shift, bool down_mix)
 238 {
 239         struct hdmi_audio *audio;
 240
 241         if (!hdmi)
 242                 return -ENXIO;
 243
 244         audio = &hdmi->audio;
 245
 246         if (num_of_channels >= ARRAY_SIZE(nchannels))
 247                 return -EINVAL;
 248
 249         audio->enabled = enabled;
 250         audio->infoframe.channels = nchannels[num_of_channels];
 251         audio->infoframe.channel_allocation = channel_allocation;
 252         audio->infoframe.level_shift_value = level_shift;
 253         audio->infoframe.downmix_inhibit = down_mix;
 254
 255         return hdmi_audio_update(hdmi);
 256 }
 257
 258 void hdmi_audio_set_sample_rate(struct hdmi *hdmi, int rate)
 259 {
 260         struct hdmi_audio *audio;
 261
 262         if (!hdmi)
 263                 return;
 264
 265         audio = &hdmi->audio;
 266
 267         if ((rate < 0) || (rate >= MSM_HDMI_SAMPLE_RATE_MAX))
 268                 return;
 269
 270         audio->rate = rate;
 271         hdmi_audio_update(hdmi);
 272 }