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 "drmP.h"
  30 #include "drm.h"
  31 #include "drm_crtc.h"
  32 #include "intel_drv.h"
  33 #include "i915_drm.h"
  34 #include "i915_drv.h"
  35 #include "dvo.h"
  36
  37 #define SIL164_ADDR     0x38
  38 #define CH7xxx_ADDR     0x76
  39 #define TFP410_ADDR     0x38
  40 #define NS2501_ADDR     0x38
  41
  42 static const struct intel_dvo_device intel_dvo_devices[] = {
  43         {
  44                 .type = INTEL_DVO_CHIP_TMDS,
  45                 .name = "sil164",
  46                 .dvo_reg = DVOC,
  47                 .slave_addr = SIL164_ADDR,
  48                 .dev_ops = &sil164_ops,
  49         },
  50         {
  51                 .type = INTEL_DVO_CHIP_TMDS,
  52                 .name = "ch7xxx",
  53                 .dvo_reg = DVOC,
  54                 .slave_addr = CH7xxx_ADDR,
  55                 .dev_ops = &ch7xxx_ops,
  56         },
  57         {
  58                 .type = INTEL_DVO_CHIP_LVDS,
  59                 .name = "ivch",
  60                 .dvo_reg = DVOA,
  61                 .slave_addr = 0x02, /* Might also be 0x44, 0x84, 0xc4 */
  62                 .dev_ops = &ivch_ops,
  63         },
  64         {
  65                 .type = INTEL_DVO_CHIP_TMDS,
  66                 .name = "tfp410",
  67                 .dvo_reg = DVOC,
  68                 .slave_addr = TFP410_ADDR,
  69                 .dev_ops = &tfp410_ops,
  70         },
  71         {
  72                 .type = INTEL_DVO_CHIP_LVDS,
  73                 .name = "ch7017",
  74                 .dvo_reg = DVOC,
  75                 .slave_addr = 0x75,
  76                 .gpio = GMBUS_PORT_DPB,
  77                 .dev_ops = &ch7017_ops,
  78         },
  79         {
  80                 .type = INTEL_DVO_CHIP_TMDS,
  81                 .name = "ns2501",
  82                 .dvo_reg = DVOC,
  83                 .slave_addr = NS2501_ADDR,
  84                 .dev_ops = &ns2501_ops,
  85        }
  86 };
  87
  88 struct intel_dvo {
  89         struct intel_encoder base;
  90
  91         struct intel_dvo_device dev;
  92
  93         struct drm_display_mode *panel_fixed_mode;
  94         bool panel_wants_dither;
  95 };
  96
  97 static struct intel_dvo *enc_to_intel_dvo(struct drm_encoder *encoder)
  98 {
  99         return container_of(encoder, struct intel_dvo, base.base);
 100 }
 101
 102 static struct intel_dvo *intel_attached_dvo(struct drm_connector *connector)
 103 {
 104         return container_of(intel_attached_encoder(connector),
 105                             struct intel_dvo, base);
 106 }
 107
 108 static void intel_dvo_dpms(struct drm_encoder *encoder, int mode)
 109 {
 110         struct drm_i915_private *dev_priv = encoder->dev->dev_private;
 111         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
 112         u32 dvo_reg = intel_dvo->dev.dvo_reg;
 113         u32 temp = I915_READ(dvo_reg);
 114
 115         if (mode == DRM_MODE_DPMS_ON) {
 116                 I915_WRITE(dvo_reg, temp | DVO_ENABLE);
 117                 I915_READ(dvo_reg);
 118                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, mode);
 119         } else {
 120                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, mode);
 121                 I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
 122                 I915_READ(dvo_reg);
 123         }
 124 }
 125
 126 static int intel_dvo_mode_valid(struct drm_connector *connector,
 127                                 struct drm_display_mode *mode)
 128 {
 129         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 130
 131         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 132                 return MODE_NO_DBLESCAN;
 133
 134         /* XXX: Validate clock range */
 135
 136         if (intel_dvo->panel_fixed_mode) {
 137                 if (mode->hdisplay > intel_dvo->panel_fixed_mode->hdisplay)
 138                         return MODE_PANEL;
 139                 if (mode->vdisplay > intel_dvo->panel_fixed_mode->vdisplay)
 140                         return MODE_PANEL;
 141         }
 142
 143         return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
 144 }
 145
 146 static bool intel_dvo_mode_fixup(struct drm_encoder *encoder,
 147                                  const struct drm_display_mode *mode,
 148                                  struct drm_display_mode *adjusted_mode)
 149 {
 150         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
 151
 152         /* If we have timings from the BIOS for the panel, put them in
 153          * to the adjusted mode.  The CRTC will be set up for this mode,
 154          * with the panel scaling set up to source from the H/VDisplay
 155          * of the original mode.
 156          */
 157         if (intel_dvo->panel_fixed_mode != NULL) {
 158 #define C(x) adjusted_mode->x = intel_dvo->panel_fixed_mode->x
 159                 C(hdisplay);
 160                 C(hsync_start);
 161                 C(hsync_end);
 162                 C(htotal);
 163                 C(vdisplay);
 164                 C(vsync_start);
 165                 C(vsync_end);
 166                 C(vtotal);
 167                 C(clock);
 168 #undef C
 169         }
 170
 171         if (intel_dvo->dev.dev_ops->mode_fixup)
 172                 return intel_dvo->dev.dev_ops->mode_fixup(&intel_dvo->dev, mode, adjusted_mode);
 173
 174         return true;
 175 }
 176
 177 static void intel_dvo_mode_set(struct drm_encoder *encoder,
 178                                struct drm_display_mode *mode,
 179                                struct drm_display_mode *adjusted_mode)
 180 {
 181         struct drm_device *dev = encoder->dev;
 182         struct drm_i915_private *dev_priv = dev->dev_private;
 183         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 184         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
 185         int pipe = intel_crtc->pipe;
 186         u32 dvo_val;
 187         u32 dvo_reg = intel_dvo->dev.dvo_reg, dvo_srcdim_reg;
 188         int dpll_reg = DPLL(pipe);
 189
 190         switch (dvo_reg) {
 191         case DVOA:
 192         default:
 193                 dvo_srcdim_reg = DVOA_SRCDIM;
 194                 break;
 195         case DVOB:
 196                 dvo_srcdim_reg = DVOB_SRCDIM;
 197                 break;
 198         case DVOC:
 199                 dvo_srcdim_reg = DVOC_SRCDIM;
 200                 break;
 201         }
 202
 203         intel_dvo->dev.dev_ops->mode_set(&intel_dvo->dev, mode, adjusted_mode);
 204
 205         /* Save the data order, since I don't know what it should be set to. */
 206         dvo_val = I915_READ(dvo_reg) &
 207                   (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
 208         dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
 209                    DVO_BLANK_ACTIVE_HIGH;
 210
 211         if (pipe == 1)
 212                 dvo_val |= DVO_PIPE_B_SELECT;
 213         dvo_val |= DVO_PIPE_STALL;
 214         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 215                 dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
 216         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 217                 dvo_val |= DVO_VSYNC_ACTIVE_HIGH;
 218
 219         I915_WRITE(dpll_reg, I915_READ(dpll_reg) | DPLL_DVO_HIGH_SPEED);
 220
 221         /*I915_WRITE(DVOB_SRCDIM,
 222           (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 223           (adjusted_mode->VDisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
 224         I915_WRITE(dvo_srcdim_reg,
 225                    (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 226                    (adjusted_mode->vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
 227         /*I915_WRITE(DVOB, dvo_val);*/
 228         I915_WRITE(dvo_reg, dvo_val);
 229 }
 230
 231 /**
 232  * Detect the output connection on our DVO device.
 233  *
 234  * Unimplemented.
 235  */
 236 static enum drm_connector_status
 237 intel_dvo_detect(struct drm_connector *connector, bool force)
 238 {
 239         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 240         return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
 241 }
 242
 243 static int intel_dvo_get_modes(struct drm_connector *connector)
 244 {
 245         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 246         struct drm_i915_private *dev_priv = connector->dev->dev_private;
 247
 248         /* We should probably have an i2c driver get_modes function for those
 249          * devices which will have a fixed set of modes determined by the chip
 250          * (TV-out, for example), but for now with just TMDS and LVDS,
 251          * that's not the case.
 252          */
 253         intel_ddc_get_modes(connector,
 254                             intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPC));
 255         if (!list_empty(&connector->probed_modes))
 256                 return 1;
 257
 258         if (intel_dvo->panel_fixed_mode != NULL) {
 259                 struct drm_display_mode *mode;
 260                 mode = drm_mode_duplicate(connector->dev, intel_dvo->panel_fixed_mode);
 261                 if (mode) {
 262                         drm_mode_probed_add(connector, mode);
 263                         return 1;
 264                 }
 265         }
 266
 267         return 0;
 268 }
 269
 270 static void intel_dvo_destroy(struct drm_connector *connector)
 271 {
 272         drm_sysfs_connector_remove(connector);
 273         drm_connector_cleanup(connector);
 274         kfree(connector);
 275 }
 276
 277 static const struct drm_encoder_helper_funcs intel_dvo_helper_funcs = {
 278         .dpms = intel_dvo_dpms,
 279         .mode_fixup = intel_dvo_mode_fixup,
 280         .prepare = intel_encoder_prepare,
 281         .mode_set = intel_dvo_mode_set,
 282         .commit = intel_encoder_commit,
 283 };
 284
 285 static const struct drm_connector_funcs intel_dvo_connector_funcs = {
 286         .dpms = drm_helper_connector_dpms,
 287         .detect = intel_dvo_detect,
 288         .destroy = intel_dvo_destroy,
 289         .fill_modes = drm_helper_probe_single_connector_modes,
 290 };
 291
 292 static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
 293         .mode_valid = intel_dvo_mode_valid,
 294         .get_modes = intel_dvo_get_modes,
 295         .best_encoder = intel_best_encoder,
 296 };
 297
 298 static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
 299 {
 300         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
 301
 302         if (intel_dvo->dev.dev_ops->destroy)
 303                 intel_dvo->dev.dev_ops->destroy(&intel_dvo->dev);
 304
 305         kfree(intel_dvo->panel_fixed_mode);
 306
 307         intel_encoder_destroy(encoder);
 308 }
 309
 310 static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
 311         .destroy = intel_dvo_enc_destroy,
 312 };
 313
 314 /**
 315  * Attempts to get a fixed panel timing for LVDS (currently only the i830).
 316  *
 317  * Other chips with DVO LVDS will need to extend this to deal with the LVDS
 318  * chip being on DVOB/C and having multiple pipes.
 319  */
 320 static struct drm_display_mode *
 321 intel_dvo_get_current_mode(struct drm_connector *connector)
 322 {
 323         struct drm_device *dev = connector->dev;
 324         struct drm_i915_private *dev_priv = dev->dev_private;
 325         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 326         uint32_t dvo_val = I915_READ(intel_dvo->dev.dvo_reg);
 327         struct drm_display_mode *mode = NULL;
 328
 329         /* If the DVO port is active, that'll be the LVDS, so we can pull out
 330          * its timings to get how the BIOS set up the panel.
 331          */
 332         if (dvo_val & DVO_ENABLE) {
 333                 struct drm_crtc *crtc;
 334                 int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;
 335
 336                 crtc = intel_get_crtc_for_pipe(dev, pipe);
 337                 if (crtc) {
 338                         mode = intel_crtc_mode_get(dev, crtc);
 339                         if (mode) {
 340                                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 341                                 if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
 342                                         mode->flags |= DRM_MODE_FLAG_PHSYNC;
 343                                 if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
 344                                         mode->flags |= DRM_MODE_FLAG_PVSYNC;
 345                         }
 346                 }
 347         }
 348
 349         return mode;
 350 }
 351
 352 void intel_dvo_init(struct drm_device *dev)
 353 {
 354         struct drm_i915_private *dev_priv = dev->dev_private;
 355         struct intel_encoder *intel_encoder;
 356         struct intel_dvo *intel_dvo;
 357         struct intel_connector *intel_connector;
 358         int i;
 359         int encoder_type = DRM_MODE_ENCODER_NONE;
 360
 361         intel_dvo = kzalloc(sizeof(struct intel_dvo), GFP_KERNEL);
 362         if (!intel_dvo)
 363                 return;
 364
 365         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 366         if (!intel_connector) {
 367                 kfree(intel_dvo);
 368                 return;
 369         }
 370
 371         intel_encoder = &intel_dvo->base;
 372         drm_encoder_init(dev, &intel_encoder->base,
 373                          &intel_dvo_enc_funcs, encoder_type);
 374
 375         /* Now, try to find a controller */
 376         for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
 377                 struct drm_connector *connector = &intel_connector->base;
 378                 const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
 379                 struct i2c_adapter *i2c;
 380                 int gpio;
 381
 382                 /* Allow the I2C driver info to specify the GPIO to be used in
 383                  * special cases, but otherwise default to what's defined
 384                  * in the spec.
 385                  */
 386                 if (intel_gmbus_is_port_valid(dvo->gpio))
 387                         gpio = dvo->gpio;
 388                 else if (dvo->type == INTEL_DVO_CHIP_LVDS)
 389                         gpio = GMBUS_PORT_SSC;
 390                 else
 391                         gpio = GMBUS_PORT_DPB;
 392
 393                 /* Set up the I2C bus necessary for the chip we're probing.
 394                  * It appears that everything is on GPIOE except for panels
 395                  * on i830 laptops, which are on GPIOB (DVOA).
 396                  */
 397                 i2c = intel_gmbus_get_adapter(dev_priv, gpio);
 398
 399                 intel_dvo->dev = *dvo;
 400                 if (!dvo->dev_ops->init(&intel_dvo->dev, i2c))
 401                         continue;
 402
 403                 intel_encoder->type = INTEL_OUTPUT_DVO;
 404                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 405                 switch (dvo->type) {
 406                 case INTEL_DVO_CHIP_TMDS:
 407                         intel_encoder->cloneable = true;
 408                         drm_connector_init(dev, connector,
 409                                            &intel_dvo_connector_funcs,
 410                                            DRM_MODE_CONNECTOR_DVII);
 411                         encoder_type = DRM_MODE_ENCODER_TMDS;
 412                         break;
 413                 case INTEL_DVO_CHIP_LVDS:
 414                         intel_encoder->cloneable = false;
 415                         drm_connector_init(dev, connector,
 416                                            &intel_dvo_connector_funcs,
 417                                            DRM_MODE_CONNECTOR_LVDS);
 418                         encoder_type = DRM_MODE_ENCODER_LVDS;
 419                         break;
 420                 }
 421
 422                 drm_connector_helper_add(connector,
 423                                          &intel_dvo_connector_helper_funcs);
 424                 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 425                 connector->interlace_allowed = false;
 426                 connector->doublescan_allowed = false;
 427
 428                 drm_encoder_helper_add(&intel_encoder->base,
 429                                        &intel_dvo_helper_funcs);
 430
 431                 intel_connector_attach_encoder(intel_connector, intel_encoder);
 432                 if (dvo->type == INTEL_DVO_CHIP_LVDS) {
 433                         /* For our LVDS chipsets, we should hopefully be able
 434                          * to dig the fixed panel mode out of the BIOS data.
 435                          * However, it's in a different format from the BIOS
 436                          * data on chipsets with integrated LVDS (stored in AIM
 437                          * headers, likely), so for now, just get the current
 438                          * mode being output through DVO.
 439                          */
 440                         intel_dvo->panel_fixed_mode =
 441                                 intel_dvo_get_current_mode(connector);
 442                         intel_dvo->panel_wants_dither = true;
 443                 }
 444
 445                 drm_sysfs_connector_add(connector);
 446                 return;
 447         }
 448
 449         drm_encoder_cleanup(&intel_encoder->base);
 450         kfree(intel_dvo);
 451         kfree(intel_connector);
 452 }