drivers/gpu/drm/i915/intel_dvo.c

   1 /*
   2  * Copyright 2006 Dave Airlie <airlied@linux.ie>
   3  * Copyright © 2006-2007 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * 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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  */
  27 #include <linux/i2c.h>
  28 #include <linux/slab.h>
  29 #include <drm/drmP.h>
  30 #include <drm/drm_crtc.h>
  31 #include "intel_drv.h"
  32 #include <drm/i915_drm.h>
  33 #include "i915_drv.h"
  34 #include "dvo.h"
  35
  36 #define SIL164_ADDR     0x38
  37 #define CH7xxx_ADDR     0x76
  38 #define TFP410_ADDR     0x38
  39
  40 static const struct intel_dvo_device intel_dvo_devices[] = {
  41         {
  42                 .type = INTEL_DVO_CHIP_TMDS,
  43                 .name = "sil164",
  44                 .dvo_reg = DVOC,
  45                 .slave_addr = SIL164_ADDR,
  46                 .dev_ops = &sil164_ops,
  47         },
  48         {
  49                 .type = INTEL_DVO_CHIP_TMDS,
  50                 .name = "ch7xxx",
  51                 .dvo_reg = DVOC,
  52                 .slave_addr = CH7xxx_ADDR,
  53                 .dev_ops = &ch7xxx_ops,
  54         },
  55         {
  56                 .type = INTEL_DVO_CHIP_LVDS,
  57                 .name = "ivch",
  58                 .dvo_reg = DVOA,
  59                 .slave_addr = 0x02, /* Might also be 0x44, 0x84, 0xc4 */
  60                 .dev_ops = &ivch_ops,
  61         },
  62         {
  63                 .type = INTEL_DVO_CHIP_TMDS,
  64                 .name = "tfp410",
  65                 .dvo_reg = DVOC,
  66                 .slave_addr = TFP410_ADDR,
  67                 .dev_ops = &tfp410_ops,
  68         },
  69         {
  70                 .type = INTEL_DVO_CHIP_LVDS,
  71                 .name = "ch7017",
  72                 .dvo_reg = DVOC,
  73                 .slave_addr = 0x75,
  74                 .gpio = GMBUS_PORT_DPB,
  75                 .dev_ops = &ch7017_ops,
  76         }
  77 };
  78
  79 struct intel_dvo {
  80         struct intel_encoder base;
  81
  82         struct intel_dvo_device dev;
  83
  84         struct drm_display_mode *panel_fixed_mode;
  85         bool panel_wants_dither;
  86 };
  87
  88 static struct intel_dvo *enc_to_intel_dvo(struct drm_encoder *encoder)
  89 {
  90         return container_of(encoder, struct intel_dvo, base.base);
  91 }
  92
  93 static struct intel_dvo *intel_attached_dvo(struct drm_connector *connector)
  94 {
  95         return container_of(intel_attached_encoder(connector),
  96                             struct intel_dvo, base);
  97 }
  98
  99 static void intel_dvo_dpms(struct drm_encoder *encoder, int mode)
 100 {
 101         struct drm_i915_private *dev_priv = encoder->dev->dev_private;
 102         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
 103         u32 dvo_reg = intel_dvo->dev.dvo_reg;
 104         u32 temp = I915_READ(dvo_reg);
 105
 106         if (mode == DRM_MODE_DPMS_ON) {
 107                 I915_WRITE(dvo_reg, temp | DVO_ENABLE);
 108                 I915_READ(dvo_reg);
 109                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, mode);
 110         } else {
 111                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, mode);
 112                 I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
 113                 I915_READ(dvo_reg);
 114         }
 115 }
 116
 117 static int intel_dvo_mode_valid(struct drm_connector *connector,
 118                                 struct drm_display_mode *mode)
 119 {
 120         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 121
 122         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 123                 return MODE_NO_DBLESCAN;
 124
 125         /* XXX: Validate clock range */
 126
 127         if (intel_dvo->panel_fixed_mode) {
 128                 if (mode->hdisplay > intel_dvo->panel_fixed_mode->hdisplay)
 129                         return MODE_PANEL;
 130                 if (mode->vdisplay > intel_dvo->panel_fixed_mode->vdisplay)
 131                         return MODE_PANEL;
 132         }
 133
 134         return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
 135 }
 136
 137 static bool intel_dvo_mode_fixup(struct drm_encoder *encoder,
 138                                  const struct drm_display_mode *mode,
 139                                  struct drm_display_mode *adjusted_mode)
 140 {
 141         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
 142
 143         /* If we have timings from the BIOS for the panel, put them in
 144          * to the adjusted mode.  The CRTC will be set up for this mode,
 145          * with the panel scaling set up to source from the H/VDisplay
 146          * of the original mode.
 147          */
 148         if (intel_dvo->panel_fixed_mode != NULL) {
 149 #define C(x) adjusted_mode->x = intel_dvo->panel_fixed_mode->x
 150                 C(hdisplay);
 151                 C(hsync_start);
 152                 C(hsync_end);
 153                 C(htotal);
 154                 C(vdisplay);
 155                 C(vsync_start);
 156                 C(vsync_end);
 157                 C(vtotal);
 158                 C(clock);
 159 #undef C
 160         }
 161
 162         if (intel_dvo->dev.dev_ops->mode_fixup)
 163                 return intel_dvo->dev.dev_ops->mode_fixup(&intel_dvo->dev, mode, adjusted_mode);
 164
 165         return true;
 166 }
 167
 168 static void intel_dvo_mode_set(struct drm_encoder *encoder,
 169                                struct drm_display_mode *mode,
 170                                struct drm_display_mode *adjusted_mode)
 171 {
 172         struct drm_device *dev = encoder->dev;
 173         struct drm_i915_private *dev_priv = dev->dev_private;
 174         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 175         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
 176         int pipe = intel_crtc->pipe;
 177         u32 dvo_val;
 178         u32 dvo_reg = intel_dvo->dev.dvo_reg, dvo_srcdim_reg;
 179         int dpll_reg = DPLL(pipe);
 180
 181         switch (dvo_reg) {
 182         case DVOA:
 183         default:
 184                 dvo_srcdim_reg = DVOA_SRCDIM;
 185                 break;
 186         case DVOB:
 187                 dvo_srcdim_reg = DVOB_SRCDIM;
 188                 break;
 189         case DVOC:
 190                 dvo_srcdim_reg = DVOC_SRCDIM;
 191                 break;
 192         }
 193
 194         intel_dvo->dev.dev_ops->mode_set(&intel_dvo->dev, mode, adjusted_mode);
 195
 196         /* Save the data order, since I don't know what it should be set to. */
 197         dvo_val = I915_READ(dvo_reg) &
 198                   (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
 199         dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
 200                    DVO_BLANK_ACTIVE_HIGH;
 201
 202         if (pipe == 1)
 203                 dvo_val |= DVO_PIPE_B_SELECT;
 204         dvo_val |= DVO_PIPE_STALL;
 205         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 206                 dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
 207         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 208                 dvo_val |= DVO_VSYNC_ACTIVE_HIGH;
 209
 210         I915_WRITE(dpll_reg, I915_READ(dpll_reg) | DPLL_DVO_HIGH_SPEED);
 211
 212         /*I915_WRITE(DVOB_SRCDIM,
 213           (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 214           (adjusted_mode->VDisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
 215         I915_WRITE(dvo_srcdim_reg,
 216                    (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 217                    (adjusted_mode->vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
 218         /*I915_WRITE(DVOB, dvo_val);*/
 219         I915_WRITE(dvo_reg, dvo_val);
 220 }
 221
 222 /**
 223  * Detect the output connection on our DVO device.
 224  *
 225  * Unimplemented.
 226  */
 227 static enum drm_connector_status
 228 intel_dvo_detect(struct drm_connector *connector, bool force)
 229 {
 230         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 231         return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
 232 }
 233
 234 static int intel_dvo_get_modes(struct drm_connector *connector)
 235 {
 236         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 237         struct drm_i915_private *dev_priv = connector->dev->dev_private;
 238
 239         /* We should probably have an i2c driver get_modes function for those
 240          * devices which will have a fixed set of modes determined by the chip
 241          * (TV-out, for example), but for now with just TMDS and LVDS,
 242          * that's not the case.
 243          */
 244         intel_ddc_get_modes(connector,
 245                             intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPC));
 246         if (!list_empty(&connector->probed_modes))
 247                 return 1;
 248
 249         if (intel_dvo->panel_fixed_mode != NULL) {
 250                 struct drm_display_mode *mode;
 251                 mode = drm_mode_duplicate(connector->dev, intel_dvo->panel_fixed_mode);
 252                 if (mode) {
 253                         drm_mode_probed_add(connector, mode);
 254                         return 1;
 255                 }
 256         }
 257
 258         return 0;
 259 }
 260
 261 static void intel_dvo_destroy(struct drm_connector *connector)
 262 {
 263         drm_sysfs_connector_remove(connector);
 264         drm_connector_cleanup(connector);
 265         kfree(connector);
 266 }
 267
 268 static const struct drm_encoder_helper_funcs intel_dvo_helper_funcs = {
 269         .dpms = intel_dvo_dpms,
 270         .mode_fixup = intel_dvo_mode_fixup,
 271         .prepare = intel_encoder_prepare,
 272         .mode_set = intel_dvo_mode_set,
 273         .commit = intel_encoder_commit,
 274 };
 275
 276 static const struct drm_connector_funcs intel_dvo_connector_funcs = {
 277         .dpms = drm_helper_connector_dpms,
 278         .detect = intel_dvo_detect,
 279         .destroy = intel_dvo_destroy,
 280         .fill_modes = drm_helper_probe_single_connector_modes,
 281 };
 282
 283 static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
 284         .mode_valid = intel_dvo_mode_valid,
 285         .get_modes = intel_dvo_get_modes,
 286         .best_encoder = intel_best_encoder,
 287 };
 288
 289 static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
 290 {
 291         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
 292
 293         if (intel_dvo->dev.dev_ops->destroy)
 294                 intel_dvo->dev.dev_ops->destroy(&intel_dvo->dev);
 295
 296         kfree(intel_dvo->panel_fixed_mode);
 297
 298         intel_encoder_destroy(encoder);
 299 }
 300
 301 static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
 302         .destroy = intel_dvo_enc_destroy,
 303 };
 304
 305 /**
 306  * Attempts to get a fixed panel timing for LVDS (currently only the i830).
 307  *
 308  * Other chips with DVO LVDS will need to extend this to deal with the LVDS
 309  * chip being on DVOB/C and having multiple pipes.
 310  */
 311 static struct drm_display_mode *
 312 intel_dvo_get_current_mode(struct drm_connector *connector)
 313 {
 314         struct drm_device *dev = connector->dev;
 315         struct drm_i915_private *dev_priv = dev->dev_private;
 316         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 317         uint32_t dvo_val = I915_READ(intel_dvo->dev.dvo_reg);
 318         struct drm_display_mode *mode = NULL;
 319
 320         /* If the DVO port is active, that'll be the LVDS, so we can pull out
 321          * its timings to get how the BIOS set up the panel.
 322          */
 323         if (dvo_val & DVO_ENABLE) {
 324                 struct drm_crtc *crtc;
 325                 int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;
 326
 327                 crtc = intel_get_crtc_for_pipe(dev, pipe);
 328                 if (crtc) {
 329                         mode = intel_crtc_mode_get(dev, crtc);
 330                         if (mode) {
 331                                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 332                                 if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
 333                                         mode->flags |= DRM_MODE_FLAG_PHSYNC;
 334                                 if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
 335                                         mode->flags |= DRM_MODE_FLAG_PVSYNC;
 336                         }
 337                 }
 338         }
 339
 340         return mode;
 341 }
 342
 343 void intel_dvo_init(struct drm_device *dev)
 344 {
 345         struct drm_i915_private *dev_priv = dev->dev_private;
 346         struct intel_encoder *intel_encoder;
 347         struct intel_dvo *intel_dvo;
 348         struct intel_connector *intel_connector;
 349         int i;
 350         int encoder_type = DRM_MODE_ENCODER_NONE;
 351
 352         intel_dvo = kzalloc(sizeof(struct intel_dvo), GFP_KERNEL);
 353         if (!intel_dvo)
 354                 return;
 355
 356         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 357         if (!intel_connector) {
 358                 kfree(intel_dvo);
 359                 return;
 360         }
 361
 362         intel_encoder = &intel_dvo->base;
 363         drm_encoder_init(dev, &intel_encoder->base,
 364                          &intel_dvo_enc_funcs, encoder_type);
 365
 366         /* Now, try to find a controller */
 367         for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
 368                 struct drm_connector *connector = &intel_connector->base;
 369                 const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
 370                 struct i2c_adapter *i2c;
 371                 int gpio;
 372
 373                 /* Allow the I2C driver info to specify the GPIO to be used in
 374                  * special cases, but otherwise default to what's defined
 375                  * in the spec.
 376                  */
 377                 if (intel_gmbus_is_port_valid(dvo->gpio))
 378                         gpio = dvo->gpio;
 379                 else if (dvo->type == INTEL_DVO_CHIP_LVDS)
 380                         gpio = GMBUS_PORT_SSC;
 381                 else
 382                         gpio = GMBUS_PORT_DPB;
 383
 384                 /* Set up the I2C bus necessary for the chip we're probing.
 385                  * It appears that everything is on GPIOE except for panels
 386                  * on i830 laptops, which are on GPIOB (DVOA).
 387                  */
 388                 i2c = intel_gmbus_get_adapter(dev_priv, gpio);
 389
 390                 intel_dvo->dev = *dvo;
 391                 if (!dvo->dev_ops->init(&intel_dvo->dev, i2c))
 392                         continue;
 393
 394                 intel_encoder->type = INTEL_OUTPUT_DVO;
 395                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 396                 switch (dvo->type) {
 397                 case INTEL_DVO_CHIP_TMDS:
 398                         intel_encoder->clone_mask =
 399                                 (1 << INTEL_DVO_TMDS_CLONE_BIT) |
 400                                 (1 << INTEL_ANALOG_CLONE_BIT);
 401                         drm_connector_init(dev, connector,
 402                                            &intel_dvo_connector_funcs,
 403                                            DRM_MODE_CONNECTOR_DVII);
 404                         encoder_type = DRM_MODE_ENCODER_TMDS;
 405                         break;
 406                 case INTEL_DVO_CHIP_LVDS:
 407                         intel_encoder->clone_mask =
 408                                 (1 << INTEL_DVO_LVDS_CLONE_BIT);
 409                         drm_connector_init(dev, connector,
 410                                            &intel_dvo_connector_funcs,
 411                                            DRM_MODE_CONNECTOR_LVDS);
 412                         encoder_type = DRM_MODE_ENCODER_LVDS;
 413                         break;
 414                 }
 415
 416                 drm_connector_helper_add(connector,
 417                                          &intel_dvo_connector_helper_funcs);
 418                 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 419                 connector->interlace_allowed = false;
 420                 connector->doublescan_allowed = false;
 421
 422                 drm_encoder_helper_add(&intel_encoder->base,
 423                                        &intel_dvo_helper_funcs);
 424
 425                 intel_connector_attach_encoder(intel_connector, intel_encoder);
 426                 if (dvo->type == INTEL_DVO_CHIP_LVDS) {
 427                         /* For our LVDS chipsets, we should hopefully be able
 428                          * to dig the fixed panel mode out of the BIOS data.
 429                          * However, it's in a different format from the BIOS
 430                          * data on chipsets with integrated LVDS (stored in AIM
 431                          * headers, likely), so for now, just get the current
 432                          * mode being output through DVO.
 433                          */
 434                         intel_dvo->panel_fixed_mode =
 435                                 intel_dvo_get_current_mode(connector);
 436                         intel_dvo->panel_wants_dither = true;
 437                 }
 438
 439                 drm_sysfs_connector_add(connector);
 440                 return;
 441         }
 442
 443         drm_encoder_cleanup(&intel_encoder->base);
 444         kfree(intel_dvo);
 445         kfree(intel_connector);
 446 }