drivers/gpu/drm/i915/dvo_ch7xxx.c

   1 /**************************************************************************
   2
   3 Copyright © 2006 Dave Airlie
   4
   5 All Rights Reserved.
   6
   7 Permission is hereby granted, free of charge, to any person obtaining a
   8 copy of this software and associated documentation files (the
   9 "Software"), to deal in the Software without restriction, including
  10 without limitation the rights to use, copy, modify, merge, publish,
  11 distribute, sub license, and/or sell copies of the Software, and to
  12 permit persons to whom the Software is furnished to do so, subject to
  13 the following conditions:
  14
  15 The above copyright notice and this permission notice (including the
  16 next paragraph) shall be included in all copies or substantial portions
  17 of the Software.
  18
  19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  23 ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26
  27 **************************************************************************/
  28
  29 #include "dvo.h"
  30
  31 #define CH7xxx_REG_VID          0x4a
  32 #define CH7xxx_REG_DID          0x4b
  33
  34 #define CH7011_VID              0x83 /* 7010 as well */
  35 #define CH7009A_VID             0x84
  36 #define CH7009B_VID             0x85
  37 #define CH7301_VID              0x95
  38
  39 #define CH7xxx_VID              0x84
  40 #define CH7xxx_DID              0x17
  41
  42 #define CH7xxx_NUM_REGS         0x4c
  43
  44 #define CH7xxx_CM               0x1c
  45 #define CH7xxx_CM_XCM           (1<<0)
  46 #define CH7xxx_CM_MCP           (1<<2)
  47 #define CH7xxx_INPUT_CLOCK      0x1d
  48 #define CH7xxx_GPIO             0x1e
  49 #define CH7xxx_GPIO_HPIR        (1<<3)
  50 #define CH7xxx_IDF              0x1f
  51
  52 #define CH7xxx_IDF_HSP          (1<<3)
  53 #define CH7xxx_IDF_VSP          (1<<4)
  54
  55 #define CH7xxx_CONNECTION_DETECT 0x20
  56 #define CH7xxx_CDET_DVI         (1<<5)
  57
  58 #define CH7301_DAC_CNTL         0x21
  59 #define CH7301_HOTPLUG          0x23
  60 #define CH7xxx_TCTL             0x31
  61 #define CH7xxx_TVCO             0x32
  62 #define CH7xxx_TPCP             0x33
  63 #define CH7xxx_TPD              0x34
  64 #define CH7xxx_TPVT             0x35
  65 #define CH7xxx_TLPF             0x36
  66 #define CH7xxx_TCT              0x37
  67 #define CH7301_TEST_PATTERN     0x48
  68
  69 #define CH7xxx_PM               0x49
  70 #define CH7xxx_PM_FPD           (1<<0)
  71 #define CH7301_PM_DACPD0        (1<<1)
  72 #define CH7301_PM_DACPD1        (1<<2)
  73 #define CH7301_PM_DACPD2        (1<<3)
  74 #define CH7xxx_PM_DVIL          (1<<6)
  75 #define CH7xxx_PM_DVIP          (1<<7)
  76
  77 #define CH7301_SYNC_POLARITY    0x56
  78 #define CH7301_SYNC_RGB_YUV     (1<<0)
  79 #define CH7301_SYNC_POL_DVI     (1<<5)
  80
  81 /** @file
  82  * driver for the Chrontel 7xxx DVI chip over DVO.
  83  */
  84
  85 static struct ch7xxx_id_struct {
  86         uint8_t vid;
  87         char *name;
  88 } ch7xxx_ids[] = {
  89         { CH7011_VID, "CH7011" },
  90         { CH7009A_VID, "CH7009A" },
  91         { CH7009B_VID, "CH7009B" },
  92         { CH7301_VID, "CH7301" },
  93 };
  94
  95 struct ch7xxx_priv {
  96         bool quiet;
  97 };
  98
  99 static char *ch7xxx_get_id(uint8_t vid)
 100 {
 101         int i;
 102
 103         for (i = 0; i < ARRAY_SIZE(ch7xxx_ids); i++) {
 104                 if (ch7xxx_ids[i].vid == vid)
 105                         return ch7xxx_ids[i].name;
 106         }
 107
 108         return NULL;
 109 }
 110
 111 /** Reads an 8 bit register */
 112 static bool ch7xxx_readb(struct intel_dvo_device *dvo, int addr, uint8_t *ch)
 113 {
 114         struct ch7xxx_priv *ch7xxx= dvo->dev_priv;
 115         struct i2c_adapter *adapter = dvo->i2c_bus;
 116         u8 out_buf[2];
 117         u8 in_buf[2];
 118
 119         struct i2c_msg msgs[] = {
 120                 {
 121                         .addr = dvo->slave_addr,
 122                         .flags = 0,
 123                         .len = 1,
 124                         .buf = out_buf,
 125                 },
 126                 {
 127                         .addr = dvo->slave_addr,
 128                         .flags = I2C_M_RD,
 129                         .len = 1,
 130                         .buf = in_buf,
 131                 }
 132         };
 133
 134         out_buf[0] = addr;
 135         out_buf[1] = 0;
 136
 137         if (i2c_transfer(adapter, msgs, 2) == 2) {
 138                 *ch = in_buf[0];
 139                 return true;
 140         };
 141
 142         if (!ch7xxx->quiet) {
 143                 DRM_DEBUG_KMS("Unable to read register 0x%02x from %s:%02x.\n",
 144                           addr, adapter->name, dvo->slave_addr);
 145         }
 146         return false;
 147 }
 148
 149 /** Writes an 8 bit register */
 150 static bool ch7xxx_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch)
 151 {
 152         struct ch7xxx_priv *ch7xxx = dvo->dev_priv;
 153         struct i2c_adapter *adapter = dvo->i2c_bus;
 154         uint8_t out_buf[2];
 155         struct i2c_msg msg = {
 156                 .addr = dvo->slave_addr,
 157                 .flags = 0,
 158                 .len = 2,
 159                 .buf = out_buf,
 160         };
 161
 162         out_buf[0] = addr;
 163         out_buf[1] = ch;
 164
 165         if (i2c_transfer(adapter, &msg, 1) == 1)
 166                 return true;
 167
 168         if (!ch7xxx->quiet) {
 169                 DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
 170                           addr, adapter->name, dvo->slave_addr);
 171         }
 172
 173         return false;
 174 }
 175
 176 static bool ch7xxx_init(struct intel_dvo_device *dvo,
 177                         struct i2c_adapter *adapter)
 178 {
 179         /* this will detect the CH7xxx chip on the specified i2c bus */
 180         struct ch7xxx_priv *ch7xxx;
 181         uint8_t vendor, device;
 182         char *name;
 183
 184         ch7xxx = kzalloc(sizeof(struct ch7xxx_priv), GFP_KERNEL);
 185         if (ch7xxx == NULL)
 186                 return false;
 187
 188         dvo->i2c_bus = adapter;
 189         dvo->dev_priv = ch7xxx;
 190         ch7xxx->quiet = true;
 191
 192         if (!ch7xxx_readb(dvo, CH7xxx_REG_VID, &vendor))
 193                 goto out;
 194
 195         name = ch7xxx_get_id(vendor);
 196         if (!name) {
 197                 DRM_DEBUG_KMS("ch7xxx not detected; got 0x%02x from %s "
 198                                 "slave %d.\n",
 199                           vendor, adapter->name, dvo->slave_addr);
 200                 goto out;
 201         }
 202
 203
 204         if (!ch7xxx_readb(dvo, CH7xxx_REG_DID, &device))
 205                 goto out;
 206
 207         if (device != CH7xxx_DID) {
 208                 DRM_DEBUG_KMS("ch7xxx not detected; got 0x%02x from %s "
 209                                 "slave %d.\n",
 210                           vendor, adapter->name, dvo->slave_addr);
 211                 goto out;
 212         }
 213
 214         ch7xxx->quiet = false;
 215         DRM_DEBUG_KMS("Detected %s chipset, vendor/device ID 0x%02x/0x%02x\n",
 216                   name, vendor, device);
 217         return true;
 218 out:
 219         kfree(ch7xxx);
 220         return false;
 221 }
 222
 223 static enum drm_connector_status ch7xxx_detect(struct intel_dvo_device *dvo)
 224 {
 225         uint8_t cdet, orig_pm, pm;
 226
 227         ch7xxx_readb(dvo, CH7xxx_PM, &orig_pm);
 228
 229         pm = orig_pm;
 230         pm &= ~CH7xxx_PM_FPD;
 231         pm |= CH7xxx_PM_DVIL | CH7xxx_PM_DVIP;
 232
 233         ch7xxx_writeb(dvo, CH7xxx_PM, pm);
 234
 235         ch7xxx_readb(dvo, CH7xxx_CONNECTION_DETECT, &cdet);
 236
 237         ch7xxx_writeb(dvo, CH7xxx_PM, orig_pm);
 238
 239         if (cdet & CH7xxx_CDET_DVI)
 240                 return connector_status_connected;
 241         return connector_status_disconnected;
 242 }
 243
 244 static enum drm_mode_status ch7xxx_mode_valid(struct intel_dvo_device *dvo,
 245                                               struct drm_display_mode *mode)
 246 {
 247         if (mode->clock > 165000)
 248                 return MODE_CLOCK_HIGH;
 249
 250         return MODE_OK;
 251 }
 252
 253 static void ch7xxx_mode_set(struct intel_dvo_device *dvo,
 254                             struct drm_display_mode *mode,
 255                             struct drm_display_mode *adjusted_mode)
 256 {
 257         uint8_t tvco, tpcp, tpd, tlpf, idf;
 258
 259         if (mode->clock <= 65000) {
 260                 tvco = 0x23;
 261                 tpcp = 0x08;
 262                 tpd = 0x16;
 263                 tlpf = 0x60;
 264         } else {
 265                 tvco = 0x2d;
 266                 tpcp = 0x06;
 267                 tpd = 0x26;
 268                 tlpf = 0xa0;
 269         }
 270
 271         ch7xxx_writeb(dvo, CH7xxx_TCTL, 0x00);
 272         ch7xxx_writeb(dvo, CH7xxx_TVCO, tvco);
 273         ch7xxx_writeb(dvo, CH7xxx_TPCP, tpcp);
 274         ch7xxx_writeb(dvo, CH7xxx_TPD, tpd);
 275         ch7xxx_writeb(dvo, CH7xxx_TPVT, 0x30);
 276         ch7xxx_writeb(dvo, CH7xxx_TLPF, tlpf);
 277         ch7xxx_writeb(dvo, CH7xxx_TCT, 0x00);
 278
 279         ch7xxx_readb(dvo, CH7xxx_IDF, &idf);
 280
 281         idf &= ~(CH7xxx_IDF_HSP | CH7xxx_IDF_VSP);
 282         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 283                 idf |= CH7xxx_IDF_HSP;
 284
 285         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 286                 idf |= CH7xxx_IDF_HSP;
 287
 288         ch7xxx_writeb(dvo, CH7xxx_IDF, idf);
 289 }
 290
 291 /* set the CH7xxx power state */
 292 static void ch7xxx_dpms(struct intel_dvo_device *dvo, int mode)
 293 {
 294         if (mode == DRM_MODE_DPMS_ON)
 295                 ch7xxx_writeb(dvo, CH7xxx_PM, CH7xxx_PM_DVIL | CH7xxx_PM_DVIP);
 296         else
 297                 ch7xxx_writeb(dvo, CH7xxx_PM, CH7xxx_PM_FPD);
 298 }
 299
 300 static void ch7xxx_dump_regs(struct intel_dvo_device *dvo)
 301 {
 302         int i;
 303
 304         for (i = 0; i < CH7xxx_NUM_REGS; i++) {
 305                 uint8_t val;
 306                 if ((i % 8) == 0 )
 307                         DRM_LOG_KMS("\n %02X: ", i);
 308                 ch7xxx_readb(dvo, i, &val);
 309                 DRM_LOG_KMS("%02X ", val);
 310         }
 311 }
 312
 313 static void ch7xxx_destroy(struct intel_dvo_device *dvo)
 314 {
 315         struct ch7xxx_priv *ch7xxx = dvo->dev_priv;
 316
 317         if (ch7xxx) {
 318                 kfree(ch7xxx);
 319                 dvo->dev_priv = NULL;
 320         }
 321 }
 322
 323 struct intel_dvo_dev_ops ch7xxx_ops = {
 324         .init = ch7xxx_init,
 325         .detect = ch7xxx_detect,
 326         .mode_valid = ch7xxx_mode_valid,
 327         .mode_set = ch7xxx_mode_set,
 328         .dpms = ch7xxx_dpms,
 329         .dump_regs = ch7xxx_dump_regs,
 330         .destroy = ch7xxx_destroy,
 331 };