drivers/gpu/drm/gma500/oaktrail_lvds.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright © 2006-2009 Intel Corporation
   4  *
   5  * Authors:
   6  *      Eric Anholt <eric@anholt.net>
   7  *      Dave Airlie <airlied@linux.ie>
   8  *      Jesse Barnes <jesse.barnes@intel.com>
   9  */
  10
  11 #include <linux/i2c.h>
  12 #include <linux/pm_runtime.h>
  13
  14 #include <asm/intel-mid.h>
  15
  16 #include <drm/drm_simple_kms_helper.h>
  17
  18 #include "intel_bios.h"
  19 #include "power.h"
  20 #include "psb_drv.h"
  21 #include "psb_intel_drv.h"
  22 #include "psb_intel_reg.h"
  23
  24 /* The max/min PWM frequency in BPCR[31:17] - */
  25 /* The smallest number is 1 (not 0) that can fit in the
  26  * 15-bit field of the and then*/
  27 /* shifts to the left by one bit to get the actual 16-bit
  28  * value that the 15-bits correspond to.*/
  29 #define MRST_BLC_MAX_PWM_REG_FREQ           0xFFFF
  30 #define BRIGHTNESS_MAX_LEVEL 100
  31
  32 /**
  33  * Sets the power state for the panel.
  34  */
  35 static void oaktrail_lvds_set_power(struct drm_device *dev,
  36                                 struct gma_encoder *gma_encoder,
  37                                 bool on)
  38 {
  39         u32 pp_status;
  40         struct drm_psb_private *dev_priv = dev->dev_private;
  41
  42         if (!gma_power_begin(dev, true))
  43                 return;
  44
  45         if (on) {
  46                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
  47                           POWER_TARGET_ON);
  48                 do {
  49                         pp_status = REG_READ(PP_STATUS);
  50                 } while ((pp_status & (PP_ON | PP_READY)) == PP_READY);
  51                 dev_priv->is_lvds_on = true;
  52                 if (dev_priv->ops->lvds_bl_power)
  53                         dev_priv->ops->lvds_bl_power(dev, true);
  54         } else {
  55                 if (dev_priv->ops->lvds_bl_power)
  56                         dev_priv->ops->lvds_bl_power(dev, false);
  57                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
  58                           ~POWER_TARGET_ON);
  59                 do {
  60                         pp_status = REG_READ(PP_STATUS);
  61                 } while (pp_status & PP_ON);
  62                 dev_priv->is_lvds_on = false;
  63                 pm_request_idle(&dev->pdev->dev);
  64         }
  65         gma_power_end(dev);
  66 }
  67
  68 static void oaktrail_lvds_dpms(struct drm_encoder *encoder, int mode)
  69 {
  70         struct drm_device *dev = encoder->dev;
  71         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
  72
  73         if (mode == DRM_MODE_DPMS_ON)
  74                 oaktrail_lvds_set_power(dev, gma_encoder, true);
  75         else
  76                 oaktrail_lvds_set_power(dev, gma_encoder, false);
  77
  78         /* XXX: We never power down the LVDS pairs. */
  79 }
  80
  81 static void oaktrail_lvds_mode_set(struct drm_encoder *encoder,
  82                                struct drm_display_mode *mode,
  83                                struct drm_display_mode *adjusted_mode)
  84 {
  85         struct drm_device *dev = encoder->dev;
  86         struct drm_psb_private *dev_priv = dev->dev_private;
  87         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
  88         struct drm_mode_config *mode_config = &dev->mode_config;
  89         struct drm_connector *connector = NULL;
  90         struct drm_crtc *crtc = encoder->crtc;
  91         u32 lvds_port;
  92         uint64_t v = DRM_MODE_SCALE_FULLSCREEN;
  93
  94         if (!gma_power_begin(dev, true))
  95                 return;
  96
  97         /*
  98          * The LVDS pin pair will already have been turned on in the
  99          * psb_intel_crtc_mode_set since it has a large impact on the DPLL
 100          * settings.
 101          */
 102         lvds_port = (REG_READ(LVDS) &
 103                     (~LVDS_PIPEB_SELECT)) |
 104                     LVDS_PORT_EN |
 105                     LVDS_BORDER_EN;
 106
 107         /* If the firmware says dither on Moorestown, or the BIOS does
 108            on Oaktrail then enable dithering */
 109         if (mode_dev->panel_wants_dither || dev_priv->lvds_dither)
 110                 lvds_port |= MRST_PANEL_8TO6_DITHER_ENABLE;
 111
 112         REG_WRITE(LVDS, lvds_port);
 113
 114         /* Find the connector we're trying to set up */
 115         list_for_each_entry(connector, &mode_config->connector_list, head) {
 116                 if (!connector->encoder || connector->encoder->crtc != crtc)
 117                         continue;
 118         }
 119
 120         if (!connector) {
 121                 DRM_ERROR("Couldn't find connector when setting mode");
 122                 gma_power_end(dev);
 123                 return;
 124         }
 125
 126         drm_object_property_get_value(
 127                 &connector->base,
 128                 dev->mode_config.scaling_mode_property,
 129                 &v);
 130
 131         if (v == DRM_MODE_SCALE_NO_SCALE)
 132                 REG_WRITE(PFIT_CONTROL, 0);
 133         else if (v == DRM_MODE_SCALE_ASPECT) {
 134                 if ((mode->vdisplay != adjusted_mode->crtc_vdisplay) ||
 135                     (mode->hdisplay != adjusted_mode->crtc_hdisplay)) {
 136                         if ((adjusted_mode->crtc_hdisplay * mode->vdisplay) ==
 137                             (mode->hdisplay * adjusted_mode->crtc_vdisplay))
 138                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 139                         else if ((adjusted_mode->crtc_hdisplay *
 140                                 mode->vdisplay) > (mode->hdisplay *
 141                                 adjusted_mode->crtc_vdisplay))
 142                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE |
 143                                           PFIT_SCALING_MODE_PILLARBOX);
 144                         else
 145                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE |
 146                                           PFIT_SCALING_MODE_LETTERBOX);
 147                 } else
 148                         REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 149         } else /*(v == DRM_MODE_SCALE_FULLSCREEN)*/
 150                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 151
 152         gma_power_end(dev);
 153 }
 154
 155 static void oaktrail_lvds_prepare(struct drm_encoder *encoder)
 156 {
 157         struct drm_device *dev = encoder->dev;
 158         struct drm_psb_private *dev_priv = dev->dev_private;
 159         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
 160         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 161
 162         if (!gma_power_begin(dev, true))
 163                 return;
 164
 165         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 166         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 167                                           BACKLIGHT_DUTY_CYCLE_MASK);
 168         oaktrail_lvds_set_power(dev, gma_encoder, false);
 169         gma_power_end(dev);
 170 }
 171
 172 static u32 oaktrail_lvds_get_max_backlight(struct drm_device *dev)
 173 {
 174         struct drm_psb_private *dev_priv = dev->dev_private;
 175         u32 ret;
 176
 177         if (gma_power_begin(dev, false)) {
 178                 ret = ((REG_READ(BLC_PWM_CTL) &
 179                           BACKLIGHT_MODULATION_FREQ_MASK) >>
 180                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
 181
 182                 gma_power_end(dev);
 183         } else
 184                 ret = ((dev_priv->regs.saveBLC_PWM_CTL &
 185                           BACKLIGHT_MODULATION_FREQ_MASK) >>
 186                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
 187
 188         return ret;
 189 }
 190
 191 static void oaktrail_lvds_commit(struct drm_encoder *encoder)
 192 {
 193         struct drm_device *dev = encoder->dev;
 194         struct drm_psb_private *dev_priv = dev->dev_private;
 195         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
 196         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 197
 198         if (mode_dev->backlight_duty_cycle == 0)
 199                 mode_dev->backlight_duty_cycle =
 200                                         oaktrail_lvds_get_max_backlight(dev);
 201         oaktrail_lvds_set_power(dev, gma_encoder, true);
 202 }
 203
 204 static const struct drm_encoder_helper_funcs oaktrail_lvds_helper_funcs = {
 205         .dpms = oaktrail_lvds_dpms,
 206         .mode_fixup = psb_intel_lvds_mode_fixup,
 207         .prepare = oaktrail_lvds_prepare,
 208         .mode_set = oaktrail_lvds_mode_set,
 209         .commit = oaktrail_lvds_commit,
 210 };
 211
 212 /* Returns the panel fixed mode from configuration. */
 213
 214 static void oaktrail_lvds_get_configuration_mode(struct drm_device *dev,
 215                                         struct psb_intel_mode_device *mode_dev)
 216 {
 217         struct drm_display_mode *mode = NULL;
 218         struct drm_psb_private *dev_priv = dev->dev_private;
 219         struct oaktrail_timing_info *ti = &dev_priv->gct_data.DTD;
 220
 221         mode_dev->panel_fixed_mode = NULL;
 222
 223         /* Use the firmware provided data on Moorestown */
 224         if (dev_priv->has_gct) {
 225                 mode = kzalloc(sizeof(*mode), GFP_KERNEL);
 226                 if (!mode)
 227                         return;
 228
 229                 mode->hdisplay = (ti->hactive_hi << 8) | ti->hactive_lo;
 230                 mode->vdisplay = (ti->vactive_hi << 8) | ti->vactive_lo;
 231                 mode->hsync_start = mode->hdisplay + \
 232                                 ((ti->hsync_offset_hi << 8) | \
 233                                 ti->hsync_offset_lo);
 234                 mode->hsync_end = mode->hsync_start + \
 235                                 ((ti->hsync_pulse_width_hi << 8) | \
 236                                 ti->hsync_pulse_width_lo);
 237                 mode->htotal = mode->hdisplay + ((ti->hblank_hi << 8) | \
 238                                                         ti->hblank_lo);
 239                 mode->vsync_start = \
 240                         mode->vdisplay + ((ti->vsync_offset_hi << 4) | \
 241                                                 ti->vsync_offset_lo);
 242                 mode->vsync_end = \
 243                         mode->vsync_start + ((ti->vsync_pulse_width_hi << 4) | \
 244                                                 ti->vsync_pulse_width_lo);
 245                 mode->vtotal = mode->vdisplay + \
 246                                 ((ti->vblank_hi << 8) | ti->vblank_lo);
 247                 mode->clock = ti->pixel_clock * 10;
 248 #if 0
 249                 pr_info("hdisplay is %d\n", mode->hdisplay);
 250                 pr_info("vdisplay is %d\n", mode->vdisplay);
 251                 pr_info("HSS is %d\n", mode->hsync_start);
 252                 pr_info("HSE is %d\n", mode->hsync_end);
 253                 pr_info("htotal is %d\n", mode->htotal);
 254                 pr_info("VSS is %d\n", mode->vsync_start);
 255                 pr_info("VSE is %d\n", mode->vsync_end);
 256                 pr_info("vtotal is %d\n", mode->vtotal);
 257                 pr_info("clock is %d\n", mode->clock);
 258 #endif
 259                 mode_dev->panel_fixed_mode = mode;
 260         }
 261
 262         /* Use the BIOS VBT mode if available */
 263         if (mode_dev->panel_fixed_mode == NULL && mode_dev->vbt_mode)
 264                 mode_dev->panel_fixed_mode = drm_mode_duplicate(dev,
 265                                                 mode_dev->vbt_mode);
 266
 267         /* Then try the LVDS VBT mode */
 268         if (mode_dev->panel_fixed_mode == NULL)
 269                 if (dev_priv->lfp_lvds_vbt_mode)
 270                         mode_dev->panel_fixed_mode =
 271                                 drm_mode_duplicate(dev,
 272                                         dev_priv->lfp_lvds_vbt_mode);
 273
 274         /* If we still got no mode then bail */
 275         if (mode_dev->panel_fixed_mode == NULL)
 276                 return;
 277
 278         drm_mode_set_name(mode_dev->panel_fixed_mode);
 279         drm_mode_set_crtcinfo(mode_dev->panel_fixed_mode, 0);
 280 }
 281
 282 /**
 283  * oaktrail_lvds_init - setup LVDS connectors on this device
 284  * @dev: drm device
 285  *
 286  * Create the connector, register the LVDS DDC bus, and try to figure out what
 287  * modes we can display on the LVDS panel (if present).
 288  */
 289 void oaktrail_lvds_init(struct drm_device *dev,
 290                     struct psb_intel_mode_device *mode_dev)
 291 {
 292         struct gma_encoder *gma_encoder;
 293         struct gma_connector *gma_connector;
 294         struct drm_connector *connector;
 295         struct drm_encoder *encoder;
 296         struct drm_psb_private *dev_priv = dev->dev_private;
 297         struct edid *edid;
 298         struct i2c_adapter *i2c_adap;
 299         struct drm_display_mode *scan;  /* *modes, *bios_mode; */
 300
 301         gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
 302         if (!gma_encoder)
 303                 return;
 304
 305         gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
 306         if (!gma_connector)
 307                 goto failed_connector;
 308
 309         connector = &gma_connector->base;
 310         encoder = &gma_encoder->base;
 311         dev_priv->is_lvds_on = true;
 312         drm_connector_init(dev, connector,
 313                            &psb_intel_lvds_connector_funcs,
 314                            DRM_MODE_CONNECTOR_LVDS);
 315
 316         drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
 317
 318         gma_connector_attach_encoder(gma_connector, gma_encoder);
 319         gma_encoder->type = INTEL_OUTPUT_LVDS;
 320
 321         drm_encoder_helper_add(encoder, &oaktrail_lvds_helper_funcs);
 322         drm_connector_helper_add(connector,
 323                                  &psb_intel_lvds_connector_helper_funcs);
 324         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 325         connector->interlace_allowed = false;
 326         connector->doublescan_allowed = false;
 327
 328         drm_object_attach_property(&connector->base,
 329                                         dev->mode_config.scaling_mode_property,
 330                                         DRM_MODE_SCALE_FULLSCREEN);
 331         drm_object_attach_property(&connector->base,
 332                                         dev_priv->backlight_property,
 333                                         BRIGHTNESS_MAX_LEVEL);
 334
 335         mode_dev->panel_wants_dither = false;
 336         if (dev_priv->has_gct)
 337                 mode_dev->panel_wants_dither = (dev_priv->gct_data.
 338                         Panel_Port_Control & MRST_PANEL_8TO6_DITHER_ENABLE);
 339         if (dev_priv->lvds_dither)
 340                 mode_dev->panel_wants_dither = 1;
 341
 342         /*
 343          * LVDS discovery:
 344          * 1) check for EDID on DDC
 345          * 2) check for VBT data
 346          * 3) check to see if LVDS is already on
 347          *    if none of the above, no panel
 348          * 4) make sure lid is open
 349          *    if closed, act like it's not there for now
 350          */
 351
 352         edid = NULL;
 353         mutex_lock(&dev->mode_config.mutex);
 354         i2c_adap = i2c_get_adapter(dev_priv->ops->i2c_bus);
 355         if (i2c_adap)
 356                 edid = drm_get_edid(connector, i2c_adap);
 357         if (edid == NULL && dev_priv->lpc_gpio_base) {
 358                 oaktrail_lvds_i2c_init(encoder);
 359                 if (gma_encoder->ddc_bus != NULL) {
 360                         i2c_adap = &gma_encoder->ddc_bus->adapter;
 361                         edid = drm_get_edid(connector, i2c_adap);
 362                 }
 363         }
 364         /*
 365          * Attempt to get the fixed panel mode from DDC.  Assume that the
 366          * preferred mode is the right one.
 367          */
 368         if (edid) {
 369                 drm_connector_update_edid_property(connector, edid);
 370                 drm_add_edid_modes(connector, edid);
 371                 kfree(edid);
 372
 373                 list_for_each_entry(scan, &connector->probed_modes, head) {
 374                         if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 375                                 mode_dev->panel_fixed_mode =
 376                                     drm_mode_duplicate(dev, scan);
 377                                 goto out;       /* FIXME: check for quirks */
 378                         }
 379                 }
 380         } else
 381                 dev_err(dev->dev, "No ddc adapter available!\n");
 382         /*
 383          * If we didn't get EDID, try geting panel timing
 384          * from configuration data
 385          */
 386         oaktrail_lvds_get_configuration_mode(dev, mode_dev);
 387
 388         if (mode_dev->panel_fixed_mode) {
 389                 mode_dev->panel_fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 390                 goto out;       /* FIXME: check for quirks */
 391         }
 392
 393         /* If we still don't have a mode after all that, give up. */
 394         if (!mode_dev->panel_fixed_mode) {
 395                 dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n");
 396                 goto failed_find;
 397         }
 398
 399 out:
 400         mutex_unlock(&dev->mode_config.mutex);
 401
 402         drm_connector_register(connector);
 403         return;
 404
 405 failed_find:
 406         mutex_unlock(&dev->mode_config.mutex);
 407
 408         dev_dbg(dev->dev, "No LVDS modes found, disabling.\n");
 409         if (gma_encoder->ddc_bus) {
 410                 psb_intel_i2c_destroy(gma_encoder->ddc_bus);
 411                 gma_encoder->ddc_bus = NULL;
 412         }
 413
 414 /* failed_ddc: */
 415
 416         drm_encoder_cleanup(encoder);
 417         drm_connector_cleanup(connector);
 418         kfree(gma_connector);
 419 failed_connector:
 420         kfree(gma_encoder);
 421 }
 422