drivers/gpu/drm/radeon/r600_audio.c

   1 /*
   2  * Copyright 2008 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  * Copyright 2009 Christian König.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors: Christian König
  25  */
  26 #include "drmP.h"
  27 #include "radeon.h"
  28 #include "radeon_reg.h"
  29 #include "atom.h"
  30
  31 #define AUDIO_TIMER_INTERVALL 100 /* 1/10 sekund should be enough */
  32
  33 /*
  34  * check if the chipset is supported
  35  */
  36 static int r600_audio_chipset_supported(struct radeon_device *rdev)
  37 {
  38         return (rdev->family >= CHIP_R600 && rdev->family < CHIP_CEDAR)
  39                 || rdev->family == CHIP_RS600
  40                 || rdev->family == CHIP_RS690
  41                 || rdev->family == CHIP_RS740;
  42 }
  43
  44 /*
  45  * current number of channels
  46  */
  47 int r600_audio_channels(struct radeon_device *rdev)
  48 {
  49         return (RREG32(R600_AUDIO_RATE_BPS_CHANNEL) & 0x7) + 1;
  50 }
  51
  52 /*
  53  * current bits per sample
  54  */
  55 int r600_audio_bits_per_sample(struct radeon_device *rdev)
  56 {
  57         uint32_t value = (RREG32(R600_AUDIO_RATE_BPS_CHANNEL) & 0xF0) >> 4;
  58         switch (value) {
  59         case 0x0: return  8;
  60         case 0x1: return 16;
  61         case 0x2: return 20;
  62         case 0x3: return 24;
  63         case 0x4: return 32;
  64         }
  65
  66         DRM_ERROR("Unknown bits per sample 0x%x using 16 instead.\n", (int)value);
  67
  68         return 16;
  69 }
  70
  71 /*
  72  * current sampling rate in HZ
  73  */
  74 int r600_audio_rate(struct radeon_device *rdev)
  75 {
  76         uint32_t value = RREG32(R600_AUDIO_RATE_BPS_CHANNEL);
  77         uint32_t result;
  78
  79         if (value & 0x4000)
  80                 result = 44100;
  81         else
  82                 result = 48000;
  83
  84         result *= ((value >> 11) & 0x7) + 1;
  85         result /= ((value >> 8) & 0x7) + 1;
  86
  87         return result;
  88 }
  89
  90 /*
  91  * iec 60958 status bits
  92  */
  93 uint8_t r600_audio_status_bits(struct radeon_device *rdev)
  94 {
  95         return RREG32(R600_AUDIO_STATUS_BITS) & 0xff;
  96 }
  97
  98 /*
  99  * iec 60958 category code
 100  */
 101 uint8_t r600_audio_category_code(struct radeon_device *rdev)
 102 {
 103         return (RREG32(R600_AUDIO_STATUS_BITS) >> 8) & 0xff;
 104 }
 105
 106 /*
 107  * schedule next audio update event
 108  */
 109 void r600_audio_schedule_polling(struct radeon_device *rdev)
 110 {
 111         mod_timer(&rdev->audio_timer,
 112                 jiffies + msecs_to_jiffies(AUDIO_TIMER_INTERVALL));
 113 }
 114
 115 /*
 116  * update all hdmi interfaces with current audio parameters
 117  */
 118 static void r600_audio_update_hdmi(unsigned long param)
 119 {
 120         struct radeon_device *rdev = (struct radeon_device *)param;
 121         struct drm_device *dev = rdev->ddev;
 122
 123         int channels = r600_audio_channels(rdev);
 124         int rate = r600_audio_rate(rdev);
 125         int bps = r600_audio_bits_per_sample(rdev);
 126         uint8_t status_bits = r600_audio_status_bits(rdev);
 127         uint8_t category_code = r600_audio_category_code(rdev);
 128
 129         struct drm_encoder *encoder;
 130         int changes = 0, still_going = 0;
 131
 132         changes |= channels != rdev->audio_channels;
 133         changes |= rate != rdev->audio_rate;
 134         changes |= bps != rdev->audio_bits_per_sample;
 135         changes |= status_bits != rdev->audio_status_bits;
 136         changes |= category_code != rdev->audio_category_code;
 137
 138         if (changes) {
 139                 rdev->audio_channels = channels;
 140                 rdev->audio_rate = rate;
 141                 rdev->audio_bits_per_sample = bps;
 142                 rdev->audio_status_bits = status_bits;
 143                 rdev->audio_category_code = category_code;
 144         }
 145
 146         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 147                 struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 148                 still_going |= radeon_encoder->audio_polling_active;
 149                 if (changes || r600_hdmi_buffer_status_changed(encoder))
 150                         r600_hdmi_update_audio_settings(encoder);
 151         }
 152
 153         if(still_going) r600_audio_schedule_polling(rdev);
 154 }
 155
 156 /*
 157  * turn on/off audio engine
 158  */
 159 static void r600_audio_engine_enable(struct radeon_device *rdev, bool enable)
 160 {
 161         DRM_INFO("%s audio support", enable ? "Enabling" : "Disabling");
 162         WREG32_P(R600_AUDIO_ENABLE, enable ? 0x81000000 : 0x0, ~0x81000000);
 163         rdev->audio_enabled = enable;
 164 }
 165
 166 /*
 167  * initialize the audio vars and register the update timer
 168  */
 169 int r600_audio_init(struct radeon_device *rdev)
 170 {
 171         if (!radeon_audio || !r600_audio_chipset_supported(rdev))
 172                 return 0;
 173
 174         r600_audio_engine_enable(rdev, true);
 175
 176         rdev->audio_channels = -1;
 177         rdev->audio_rate = -1;
 178         rdev->audio_bits_per_sample = -1;
 179         rdev->audio_status_bits = 0;
 180         rdev->audio_category_code = 0;
 181
 182         setup_timer(
 183                 &rdev->audio_timer,
 184                 r600_audio_update_hdmi,
 185                 (unsigned long)rdev);
 186
 187         return 0;
 188 }
 189
 190 /*
 191  * enable the polling timer, to check for status changes
 192  */
 193 void r600_audio_enable_polling(struct drm_encoder *encoder)
 194 {
 195         struct drm_device *dev = encoder->dev;
 196         struct radeon_device *rdev = dev->dev_private;
 197         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 198
 199         DRM_DEBUG("r600_audio_enable_polling: %d", radeon_encoder->audio_polling_active);
 200         if (radeon_encoder->audio_polling_active)
 201                 return;
 202
 203         radeon_encoder->audio_polling_active = 1;
 204         if (rdev->audio_enabled)
 205                 mod_timer(&rdev->audio_timer, jiffies + 1);
 206 }
 207
 208 /*
 209  * disable the polling timer, so we get no more status updates
 210  */
 211 void r600_audio_disable_polling(struct drm_encoder *encoder)
 212 {
 213         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 214         DRM_DEBUG("r600_audio_disable_polling: %d", radeon_encoder->audio_polling_active);
 215         radeon_encoder->audio_polling_active = 0;
 216 }
 217
 218 /*
 219  * atach the audio codec to the clock source of the encoder
 220  */
 221 void r600_audio_set_clock(struct drm_encoder *encoder, int clock)
 222 {
 223         struct drm_device *dev = encoder->dev;
 224         struct radeon_device *rdev = dev->dev_private;
 225         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 226         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 227         int base_rate = 48000;
 228
 229         switch (radeon_encoder->encoder_id) {
 230         case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_TMDS1:
 231         case ENCODER_OBJECT_ID_INTERNAL_LVTM1:
 232                 WREG32_P(R600_AUDIO_TIMING, 0, ~0x301);
 233                 break;
 234         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
 235         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
 236         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:
 237         case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
 238                 WREG32_P(R600_AUDIO_TIMING, 0x100, ~0x301);
 239                 break;
 240         default:
 241                 DRM_ERROR("Unsupported encoder type 0x%02X\n",
 242                           radeon_encoder->encoder_id);
 243                 return;
 244         }
 245
 246         switch (dig->dig_encoder) {
 247         case 0:
 248                 WREG32(R600_AUDIO_PLL1_MUL, base_rate * 50);
 249                 WREG32(R600_AUDIO_PLL1_DIV, clock * 100);
 250                 WREG32(R600_AUDIO_CLK_SRCSEL, 0);
 251                 break;
 252
 253         case 1:
 254                 WREG32(R600_AUDIO_PLL2_MUL, base_rate * 50);
 255                 WREG32(R600_AUDIO_PLL2_DIV, clock * 100);
 256                 WREG32(R600_AUDIO_CLK_SRCSEL, 1);
 257                 break;
 258         default:
 259                 dev_err(rdev->dev, "Unsupported DIG on encoder 0x%02X\n",
 260                           radeon_encoder->encoder_id);
 261                 return;
 262         }
 263 }
 264
 265 /*
 266  * release the audio timer
 267  * TODO: How to do this correctly on SMP systems?
 268  */
 269 void r600_audio_fini(struct radeon_device *rdev)
 270 {
 271         if (!rdev->audio_enabled)
 272                 return;
 273
 274         del_timer(&rdev->audio_timer);
 275
 276         r600_audio_engine_enable(rdev, false);
 277 }