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 "radeon_asic.h"
  30 #include "atom.h"
  31
  32 #define AUDIO_TIMER_INTERVALL 100 /* 1/10 sekund should be enough */
  33
  34 /*
  35  * check if the chipset is supported
  36  */
  37 static int r600_audio_chipset_supported(struct radeon_device *rdev)
  38 {
  39         return (rdev->family >= CHIP_R600 && rdev->family < CHIP_CEDAR)
  40                 || rdev->family == CHIP_RS600
  41                 || rdev->family == CHIP_RS690
  42                 || rdev->family == CHIP_RS740;
  43 }
  44
  45 /*
  46  * current number of channels
  47  */
  48 int r600_audio_channels(struct radeon_device *rdev)
  49 {
  50         return (RREG32(R600_AUDIO_RATE_BPS_CHANNEL) & 0x7) + 1;
  51 }
  52
  53 /*
  54  * current bits per sample
  55  */
  56 int r600_audio_bits_per_sample(struct radeon_device *rdev)
  57 {
  58         uint32_t value = (RREG32(R600_AUDIO_RATE_BPS_CHANNEL) & 0xF0) >> 4;
  59         switch (value) {
  60         case 0x0: return  8;
  61         case 0x1: return 16;
  62         case 0x2: return 20;
  63         case 0x3: return 24;
  64         case 0x4: return 32;
  65         }
  66
  67         dev_err(rdev->dev, "Unknown bits per sample 0x%x using 16 instead\n",
  68                 (int)value);
  69
  70         return 16;
  71 }
  72
  73 /*
  74  * current sampling rate in HZ
  75  */
  76 int r600_audio_rate(struct radeon_device *rdev)
  77 {
  78         uint32_t value = RREG32(R600_AUDIO_RATE_BPS_CHANNEL);
  79         uint32_t result;
  80
  81         if (value & 0x4000)
  82                 result = 44100;
  83         else
  84                 result = 48000;
  85
  86         result *= ((value >> 11) & 0x7) + 1;
  87         result /= ((value >> 8) & 0x7) + 1;
  88
  89         return result;
  90 }
  91
  92 /*
  93  * iec 60958 status bits
  94  */
  95 uint8_t r600_audio_status_bits(struct radeon_device *rdev)
  96 {
  97         return RREG32(R600_AUDIO_STATUS_BITS) & 0xff;
  98 }
  99
 100 /*
 101  * iec 60958 category code
 102  */
 103 uint8_t r600_audio_category_code(struct radeon_device *rdev)
 104 {
 105         return (RREG32(R600_AUDIO_STATUS_BITS) >> 8) & 0xff;
 106 }
 107
 108 /*
 109  * schedule next audio update event
 110  */
 111 void r600_audio_schedule_polling(struct radeon_device *rdev)
 112 {
 113         mod_timer(&rdev->audio_timer,
 114                 jiffies + msecs_to_jiffies(AUDIO_TIMER_INTERVALL));
 115 }
 116
 117 /*
 118  * update all hdmi interfaces with current audio parameters
 119  */
 120 static void r600_audio_update_hdmi(unsigned long param)
 121 {
 122         struct radeon_device *rdev = (struct radeon_device *)param;
 123         struct drm_device *dev = rdev->ddev;
 124
 125         int channels = r600_audio_channels(rdev);
 126         int rate = r600_audio_rate(rdev);
 127         int bps = r600_audio_bits_per_sample(rdev);
 128         uint8_t status_bits = r600_audio_status_bits(rdev);
 129         uint8_t category_code = r600_audio_category_code(rdev);
 130
 131         struct drm_encoder *encoder;
 132         int changes = 0, still_going = 0;
 133
 134         changes |= channels != rdev->audio_channels;
 135         changes |= rate != rdev->audio_rate;
 136         changes |= bps != rdev->audio_bits_per_sample;
 137         changes |= status_bits != rdev->audio_status_bits;
 138         changes |= category_code != rdev->audio_category_code;
 139
 140         if (changes) {
 141                 rdev->audio_channels = channels;
 142                 rdev->audio_rate = rate;
 143                 rdev->audio_bits_per_sample = bps;
 144                 rdev->audio_status_bits = status_bits;
 145                 rdev->audio_category_code = category_code;
 146         }
 147
 148         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 149                 struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 150                 still_going |= radeon_encoder->audio_polling_active;
 151                 if (changes || r600_hdmi_buffer_status_changed(encoder))
 152                         r600_hdmi_update_audio_settings(encoder);
 153         }
 154
 155         if (still_going)
 156                 r600_audio_schedule_polling(rdev);
 157 }
 158
 159 /*
 160  * turn on/off audio engine
 161  */
 162 static void r600_audio_engine_enable(struct radeon_device *rdev, bool enable)
 163 {
 164         DRM_INFO("%s audio support\n", enable ? "Enabling" : "Disabling");
 165         WREG32_P(R600_AUDIO_ENABLE, enable ? 0x81000000 : 0x0, ~0x81000000);
 166         rdev->audio_enabled = enable;
 167 }
 168
 169 /*
 170  * initialize the audio vars and register the update timer
 171  */
 172 int r600_audio_init(struct radeon_device *rdev)
 173 {
 174         if (!radeon_audio || !r600_audio_chipset_supported(rdev))
 175                 return 0;
 176
 177         r600_audio_engine_enable(rdev, true);
 178
 179         rdev->audio_channels = -1;
 180         rdev->audio_rate = -1;
 181         rdev->audio_bits_per_sample = -1;
 182         rdev->audio_status_bits = 0;
 183         rdev->audio_category_code = 0;
 184
 185         setup_timer(
 186                 &rdev->audio_timer,
 187                 r600_audio_update_hdmi,
 188                 (unsigned long)rdev);
 189
 190         return 0;
 191 }
 192
 193 /*
 194  * enable the polling timer, to check for status changes
 195  */
 196 void r600_audio_enable_polling(struct drm_encoder *encoder)
 197 {
 198         struct drm_device *dev = encoder->dev;
 199         struct radeon_device *rdev = dev->dev_private;
 200         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 201
 202         DRM_DEBUG("r600_audio_enable_polling: %d\n",
 203                 radeon_encoder->audio_polling_active);
 204         if (radeon_encoder->audio_polling_active)
 205                 return;
 206
 207         radeon_encoder->audio_polling_active = 1;
 208         if (rdev->audio_enabled)
 209                 mod_timer(&rdev->audio_timer, jiffies + 1);
 210 }
 211
 212 /*
 213  * disable the polling timer, so we get no more status updates
 214  */
 215 void r600_audio_disable_polling(struct drm_encoder *encoder)
 216 {
 217         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 218         DRM_DEBUG("r600_audio_disable_polling: %d\n",
 219                 radeon_encoder->audio_polling_active);
 220         radeon_encoder->audio_polling_active = 0;
 221 }
 222
 223 /*
 224  * atach the audio codec to the clock source of the encoder
 225  */
 226 void r600_audio_set_clock(struct drm_encoder *encoder, int clock)
 227 {
 228         struct drm_device *dev = encoder->dev;
 229         struct radeon_device *rdev = dev->dev_private;
 230         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 231         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 232         int base_rate = 48000;
 233
 234         switch (radeon_encoder->encoder_id) {
 235         case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_TMDS1:
 236         case ENCODER_OBJECT_ID_INTERNAL_LVTM1:
 237                 WREG32_P(R600_AUDIO_TIMING, 0, ~0x301);
 238                 break;
 239         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
 240         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
 241         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:
 242         case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
 243                 WREG32_P(R600_AUDIO_TIMING, 0x100, ~0x301);
 244                 break;
 245         default:
 246                 dev_err(rdev->dev, "Unsupported encoder type 0x%02X\n",
 247                           radeon_encoder->encoder_id);
 248                 return;
 249         }
 250
 251         switch (dig->dig_encoder) {
 252         case 0:
 253                 WREG32(R600_AUDIO_PLL1_MUL, base_rate * 50);
 254                 WREG32(R600_AUDIO_PLL1_DIV, clock * 100);
 255                 WREG32(R600_AUDIO_CLK_SRCSEL, 0);
 256                 break;
 257
 258         case 1:
 259                 WREG32(R600_AUDIO_PLL2_MUL, base_rate * 50);
 260                 WREG32(R600_AUDIO_PLL2_DIV, clock * 100);
 261                 WREG32(R600_AUDIO_CLK_SRCSEL, 1);
 262                 break;
 263         default:
 264                 dev_err(rdev->dev, "Unsupported DIG on encoder 0x%02X\n",
 265                           radeon_encoder->encoder_id);
 266                 return;
 267         }
 268 }
 269
 270 /*
 271  * release the audio timer
 272  * TODO: How to do this correctly on SMP systems?
 273  */
 274 void r600_audio_fini(struct radeon_device *rdev)
 275 {
 276         if (!rdev->audio_enabled)
 277                 return;
 278
 279         del_timer(&rdev->audio_timer);
 280
 281         r600_audio_engine_enable(rdev, false);
 282 }