drivers/gpu/drm/i915/display/dvo_ch7017.c

   1 /*
   2  * Copyright © 2006 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 #include "intel_display_types.h"
  29 #include "intel_dvo_dev.h"
  30
  31 #define CH7017_TV_DISPLAY_MODE          0x00
  32 #define CH7017_FLICKER_FILTER           0x01
  33 #define CH7017_VIDEO_BANDWIDTH          0x02
  34 #define CH7017_TEXT_ENHANCEMENT         0x03
  35 #define CH7017_START_ACTIVE_VIDEO       0x04
  36 #define CH7017_HORIZONTAL_POSITION      0x05
  37 #define CH7017_VERTICAL_POSITION        0x06
  38 #define CH7017_BLACK_LEVEL              0x07
  39 #define CH7017_CONTRAST_ENHANCEMENT     0x08
  40 #define CH7017_TV_PLL                   0x09
  41 #define CH7017_TV_PLL_M                 0x0a
  42 #define CH7017_TV_PLL_N                 0x0b
  43 #define CH7017_SUB_CARRIER_0            0x0c
  44 #define CH7017_CIV_CONTROL              0x10
  45 #define CH7017_CIV_0                    0x11
  46 #define CH7017_CHROMA_BOOST             0x14
  47 #define CH7017_CLOCK_MODE               0x1c
  48 #define CH7017_INPUT_CLOCK              0x1d
  49 #define CH7017_GPIO_CONTROL             0x1e
  50 #define CH7017_INPUT_DATA_FORMAT        0x1f
  51 #define CH7017_CONNECTION_DETECT        0x20
  52 #define CH7017_DAC_CONTROL              0x21
  53 #define CH7017_BUFFERED_CLOCK_OUTPUT    0x22
  54 #define CH7017_DEFEAT_VSYNC             0x47
  55 #define CH7017_TEST_PATTERN             0x48
  56
  57 #define CH7017_POWER_MANAGEMENT         0x49
  58 /** Enables the TV output path. */
  59 #define CH7017_TV_EN                    (1 << 0)
  60 #define CH7017_DAC0_POWER_DOWN          (1 << 1)
  61 #define CH7017_DAC1_POWER_DOWN          (1 << 2)
  62 #define CH7017_DAC2_POWER_DOWN          (1 << 3)
  63 #define CH7017_DAC3_POWER_DOWN          (1 << 4)
  64 /** Powers down the TV out block, and DAC0-3 */
  65 #define CH7017_TV_POWER_DOWN_EN         (1 << 5)
  66
  67 #define CH7017_VERSION_ID               0x4a
  68
  69 #define CH7017_DEVICE_ID                0x4b
  70 #define CH7017_DEVICE_ID_VALUE          0x1b
  71 #define CH7018_DEVICE_ID_VALUE          0x1a
  72 #define CH7019_DEVICE_ID_VALUE          0x19
  73
  74 #define CH7017_XCLK_D2_ADJUST           0x53
  75 #define CH7017_UP_SCALER_COEFF_0        0x55
  76 #define CH7017_UP_SCALER_COEFF_1        0x56
  77 #define CH7017_UP_SCALER_COEFF_2        0x57
  78 #define CH7017_UP_SCALER_COEFF_3        0x58
  79 #define CH7017_UP_SCALER_COEFF_4        0x59
  80 #define CH7017_UP_SCALER_VERTICAL_INC_0 0x5a
  81 #define CH7017_UP_SCALER_VERTICAL_INC_1 0x5b
  82 #define CH7017_GPIO_INVERT              0x5c
  83 #define CH7017_UP_SCALER_HORIZONTAL_INC_0       0x5d
  84 #define CH7017_UP_SCALER_HORIZONTAL_INC_1       0x5e
  85
  86 #define CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT    0x5f
  87 /**< Low bits of horizontal active pixel input */
  88
  89 #define CH7017_ACTIVE_INPUT_LINE_OUTPUT 0x60
  90 /** High bits of horizontal active pixel input */
  91 #define CH7017_LVDS_HAP_INPUT_MASK      (0x7 << 0)
  92 /** High bits of vertical active line output */
  93 #define CH7017_LVDS_VAL_HIGH_MASK       (0x7 << 3)
  94
  95 #define CH7017_VERTICAL_ACTIVE_LINE_OUTPUT      0x61
  96 /**< Low bits of vertical active line output */
  97
  98 #define CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT   0x62
  99 /**< Low bits of horizontal active pixel output */
 100
 101 #define CH7017_LVDS_POWER_DOWN          0x63
 102 /** High bits of horizontal active pixel output */
 103 #define CH7017_LVDS_HAP_HIGH_MASK       (0x7 << 0)
 104 /** Enables the LVDS power down state transition */
 105 #define CH7017_LVDS_POWER_DOWN_EN       (1 << 6)
 106 /** Enables the LVDS upscaler */
 107 #define CH7017_LVDS_UPSCALER_EN         (1 << 7)
 108 #define CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED 0x08
 109
 110 #define CH7017_LVDS_ENCODING            0x64
 111 #define CH7017_LVDS_DITHER_2D           (1 << 2)
 112 #define CH7017_LVDS_DITHER_DIS          (1 << 3)
 113 #define CH7017_LVDS_DUAL_CHANNEL_EN     (1 << 4)
 114 #define CH7017_LVDS_24_BIT              (1 << 5)
 115
 116 #define CH7017_LVDS_ENCODING_2          0x65
 117
 118 #define CH7017_LVDS_PLL_CONTROL         0x66
 119 /** Enables the LVDS panel output path */
 120 #define CH7017_LVDS_PANEN               (1 << 0)
 121 /** Enables the LVDS panel backlight */
 122 #define CH7017_LVDS_BKLEN               (1 << 3)
 123
 124 #define CH7017_POWER_SEQUENCING_T1      0x67
 125 #define CH7017_POWER_SEQUENCING_T2      0x68
 126 #define CH7017_POWER_SEQUENCING_T3      0x69
 127 #define CH7017_POWER_SEQUENCING_T4      0x6a
 128 #define CH7017_POWER_SEQUENCING_T5      0x6b
 129 #define CH7017_GPIO_DRIVER_TYPE         0x6c
 130 #define CH7017_GPIO_DATA                0x6d
 131 #define CH7017_GPIO_DIRECTION_CONTROL   0x6e
 132
 133 #define CH7017_LVDS_PLL_FEEDBACK_DIV    0x71
 134 # define CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT 4
 135 # define CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT 0
 136 # define CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED 0x80
 137
 138 #define CH7017_LVDS_PLL_VCO_CONTROL     0x72
 139 # define CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED 0x80
 140 # define CH7017_LVDS_PLL_VCO_SHIFT      4
 141 # define CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT 0
 142
 143 #define CH7017_OUTPUTS_ENABLE           0x73
 144 # define CH7017_CHARGE_PUMP_LOW         0x0
 145 # define CH7017_CHARGE_PUMP_HIGH        0x3
 146 # define CH7017_LVDS_CHANNEL_A          (1 << 3)
 147 # define CH7017_LVDS_CHANNEL_B          (1 << 4)
 148 # define CH7017_TV_DAC_A                (1 << 5)
 149 # define CH7017_TV_DAC_B                (1 << 6)
 150 # define CH7017_DDC_SELECT_DC2          (1 << 7)
 151
 152 #define CH7017_LVDS_OUTPUT_AMPLITUDE    0x74
 153 #define CH7017_LVDS_PLL_EMI_REDUCTION   0x75
 154 #define CH7017_LVDS_POWER_DOWN_FLICKER  0x76
 155
 156 #define CH7017_LVDS_CONTROL_2           0x78
 157 # define CH7017_LOOP_FILTER_SHIFT       5
 158 # define CH7017_PHASE_DETECTOR_SHIFT    0
 159
 160 #define CH7017_BANG_LIMIT_CONTROL       0x7f
 161
 162 struct ch7017_priv {
 163         u8 dummy;
 164 };
 165
 166 static void ch7017_dump_regs(struct intel_dvo_device *dvo);
 167 static void ch7017_dpms(struct intel_dvo_device *dvo, bool enable);
 168
 169 static bool ch7017_read(struct intel_dvo_device *dvo, u8 addr, u8 *val)
 170 {
 171         struct i2c_msg msgs[] = {
 172                 {
 173                         .addr = dvo->slave_addr,
 174                         .flags = 0,
 175                         .len = 1,
 176                         .buf = &addr,
 177                 },
 178                 {
 179                         .addr = dvo->slave_addr,
 180                         .flags = I2C_M_RD,
 181                         .len = 1,
 182                         .buf = val,
 183                 }
 184         };
 185         return i2c_transfer(dvo->i2c_bus, msgs, 2) == 2;
 186 }
 187
 188 static bool ch7017_write(struct intel_dvo_device *dvo, u8 addr, u8 val)
 189 {
 190         u8 buf[2] = { addr, val };
 191         struct i2c_msg msg = {
 192                 .addr = dvo->slave_addr,
 193                 .flags = 0,
 194                 .len = 2,
 195                 .buf = buf,
 196         };
 197         return i2c_transfer(dvo->i2c_bus, &msg, 1) == 1;
 198 }
 199
 200 /** Probes for a CH7017 on the given bus and slave address. */
 201 static bool ch7017_init(struct intel_dvo_device *dvo,
 202                         struct i2c_adapter *adapter)
 203 {
 204         struct ch7017_priv *priv;
 205         const char *str;
 206         u8 val;
 207
 208         priv = kzalloc(sizeof(struct ch7017_priv), GFP_KERNEL);
 209         if (priv == NULL)
 210                 return false;
 211
 212         dvo->i2c_bus = adapter;
 213         dvo->dev_priv = priv;
 214
 215         if (!ch7017_read(dvo, CH7017_DEVICE_ID, &val))
 216                 goto fail;
 217
 218         switch (val) {
 219         case CH7017_DEVICE_ID_VALUE:
 220                 str = "ch7017";
 221                 break;
 222         case CH7018_DEVICE_ID_VALUE:
 223                 str = "ch7018";
 224                 break;
 225         case CH7019_DEVICE_ID_VALUE:
 226                 str = "ch7019";
 227                 break;
 228         default:
 229                 DRM_DEBUG_KMS("ch701x not detected, got %d: from %s "
 230                               "slave %d.\n",
 231                               val, adapter->name, dvo->slave_addr);
 232                 goto fail;
 233         }
 234
 235         DRM_DEBUG_KMS("%s detected on %s, addr %d\n",
 236                       str, adapter->name, dvo->slave_addr);
 237         return true;
 238
 239 fail:
 240         kfree(priv);
 241         return false;
 242 }
 243
 244 static enum drm_connector_status ch7017_detect(struct intel_dvo_device *dvo)
 245 {
 246         return connector_status_connected;
 247 }
 248
 249 static enum drm_mode_status ch7017_mode_valid(struct intel_dvo_device *dvo,
 250                                               struct drm_display_mode *mode)
 251 {
 252         if (mode->clock > 160000)
 253                 return MODE_CLOCK_HIGH;
 254
 255         return MODE_OK;
 256 }
 257
 258 static void ch7017_mode_set(struct intel_dvo_device *dvo,
 259                             const struct drm_display_mode *mode,
 260                             const struct drm_display_mode *adjusted_mode)
 261 {
 262         u8 lvds_pll_feedback_div, lvds_pll_vco_control;
 263         u8 outputs_enable, lvds_control_2, lvds_power_down;
 264         u8 horizontal_active_pixel_input;
 265         u8 horizontal_active_pixel_output, vertical_active_line_output;
 266         u8 active_input_line_output;
 267
 268         DRM_DEBUG_KMS("Registers before mode setting\n");
 269         ch7017_dump_regs(dvo);
 270
 271         /* LVDS PLL settings from page 75 of 7017-7017ds.pdf*/
 272         if (mode->clock < 100000) {
 273                 outputs_enable = CH7017_LVDS_CHANNEL_A | CH7017_CHARGE_PUMP_LOW;
 274                 lvds_pll_feedback_div = CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED |
 275                         (2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) |
 276                         (13 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
 277                 lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
 278                         (2 << CH7017_LVDS_PLL_VCO_SHIFT) |
 279                         (3 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
 280                 lvds_control_2 = (1 << CH7017_LOOP_FILTER_SHIFT) |
 281                         (0 << CH7017_PHASE_DETECTOR_SHIFT);
 282         } else {
 283                 outputs_enable = CH7017_LVDS_CHANNEL_A | CH7017_CHARGE_PUMP_HIGH;
 284                 lvds_pll_feedback_div =
 285                         CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED |
 286                         (2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) |
 287                         (3 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
 288                 lvds_control_2 = (3 << CH7017_LOOP_FILTER_SHIFT) |
 289                         (0 << CH7017_PHASE_DETECTOR_SHIFT);
 290                 if (1) { /* XXX: dual channel panel detection.  Assume yes for now. */
 291                         outputs_enable |= CH7017_LVDS_CHANNEL_B;
 292                         lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
 293                                 (2 << CH7017_LVDS_PLL_VCO_SHIFT) |
 294                                 (13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
 295                 } else {
 296                         lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
 297                                 (1 << CH7017_LVDS_PLL_VCO_SHIFT) |
 298                                 (13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
 299                 }
 300         }
 301
 302         horizontal_active_pixel_input = mode->hdisplay & 0x00ff;
 303
 304         vertical_active_line_output = mode->vdisplay & 0x00ff;
 305         horizontal_active_pixel_output = mode->hdisplay & 0x00ff;
 306
 307         active_input_line_output = ((mode->hdisplay & 0x0700) >> 8) |
 308                                    (((mode->vdisplay & 0x0700) >> 8) << 3);
 309
 310         lvds_power_down = CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED |
 311                           (mode->hdisplay & 0x0700) >> 8;
 312
 313         ch7017_dpms(dvo, false);
 314         ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT,
 315                         horizontal_active_pixel_input);
 316         ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT,
 317                         horizontal_active_pixel_output);
 318         ch7017_write(dvo, CH7017_VERTICAL_ACTIVE_LINE_OUTPUT,
 319                         vertical_active_line_output);
 320         ch7017_write(dvo, CH7017_ACTIVE_INPUT_LINE_OUTPUT,
 321                         active_input_line_output);
 322         ch7017_write(dvo, CH7017_LVDS_PLL_VCO_CONTROL, lvds_pll_vco_control);
 323         ch7017_write(dvo, CH7017_LVDS_PLL_FEEDBACK_DIV, lvds_pll_feedback_div);
 324         ch7017_write(dvo, CH7017_LVDS_CONTROL_2, lvds_control_2);
 325         ch7017_write(dvo, CH7017_OUTPUTS_ENABLE, outputs_enable);
 326
 327         /* Turn the LVDS back on with new settings. */
 328         ch7017_write(dvo, CH7017_LVDS_POWER_DOWN, lvds_power_down);
 329
 330         DRM_DEBUG_KMS("Registers after mode setting\n");
 331         ch7017_dump_regs(dvo);
 332 }
 333
 334 /* set the CH7017 power state */
 335 static void ch7017_dpms(struct intel_dvo_device *dvo, bool enable)
 336 {
 337         u8 val;
 338
 339         ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &val);
 340
 341         /* Turn off TV/VGA, and never turn it on since we don't support it. */
 342         ch7017_write(dvo, CH7017_POWER_MANAGEMENT,
 343                         CH7017_DAC0_POWER_DOWN |
 344                         CH7017_DAC1_POWER_DOWN |
 345                         CH7017_DAC2_POWER_DOWN |
 346                         CH7017_DAC3_POWER_DOWN |
 347                         CH7017_TV_POWER_DOWN_EN);
 348
 349         if (enable) {
 350                 /* Turn on the LVDS */
 351                 ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
 352                              val & ~CH7017_LVDS_POWER_DOWN_EN);
 353         } else {
 354                 /* Turn off the LVDS */
 355                 ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
 356                              val | CH7017_LVDS_POWER_DOWN_EN);
 357         }
 358
 359         /* XXX: Should actually wait for update power status somehow */
 360         msleep(20);
 361 }
 362
 363 static bool ch7017_get_hw_state(struct intel_dvo_device *dvo)
 364 {
 365         u8 val;
 366
 367         ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &val);
 368
 369         if (val & CH7017_LVDS_POWER_DOWN_EN)
 370                 return false;
 371         else
 372                 return true;
 373 }
 374
 375 static void ch7017_dump_regs(struct intel_dvo_device *dvo)
 376 {
 377         u8 val;
 378
 379 #define DUMP(reg)                                       \
 380 do {                                                    \
 381         ch7017_read(dvo, reg, &val);                    \
 382         DRM_DEBUG_KMS(#reg ": %02x\n", val);            \
 383 } while (0)
 384
 385         DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT);
 386         DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT);
 387         DUMP(CH7017_VERTICAL_ACTIVE_LINE_OUTPUT);
 388         DUMP(CH7017_ACTIVE_INPUT_LINE_OUTPUT);
 389         DUMP(CH7017_LVDS_PLL_VCO_CONTROL);
 390         DUMP(CH7017_LVDS_PLL_FEEDBACK_DIV);
 391         DUMP(CH7017_LVDS_CONTROL_2);
 392         DUMP(CH7017_OUTPUTS_ENABLE);
 393         DUMP(CH7017_LVDS_POWER_DOWN);
 394 }
 395
 396 static void ch7017_destroy(struct intel_dvo_device *dvo)
 397 {
 398         struct ch7017_priv *priv = dvo->dev_priv;
 399
 400         if (priv) {
 401                 kfree(priv);
 402                 dvo->dev_priv = NULL;
 403         }
 404 }
 405
 406 const struct intel_dvo_dev_ops ch7017_ops = {
 407         .init = ch7017_init,
 408         .detect = ch7017_detect,
 409         .mode_valid = ch7017_mode_valid,
 410         .mode_set = ch7017_mode_set,
 411         .dpms = ch7017_dpms,
 412         .get_hw_state = ch7017_get_hw_state,
 413         .dump_regs = ch7017_dump_regs,
 414         .destroy = ch7017_destroy,
 415 };