1 /* 2 * Copyright © 2015 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 DEALINGS 21 * IN THE SOFTWARE. 22 * 23 */ 24 25 /* 26 * Laptops with Intel GPUs which have panels that support controlling the 27 * backlight through DP AUX can actually use two different interfaces: Intel's 28 * proprietary DP AUX backlight interface, and the standard VESA backlight 29 * interface. Unfortunately, at the time of writing this a lot of laptops will 30 * advertise support for the standard VESA backlight interface when they 31 * don't properly support it. However, on these systems the Intel backlight 32 * interface generally does work properly. Additionally, these systems will 33 * usually just indicate that they use PWM backlight controls in their VBIOS 34 * for some reason. 35 */ 36 37 #include <drm/drm_print.h> 38 39 #include "intel_backlight.h" 40 #include "intel_display_core.h" 41 #include "intel_display_types.h" 42 #include "intel_dp.h" 43 #include "intel_dp_aux_backlight.h" 44 45 /* 46 * DP AUX registers for Intel's proprietary HDR backlight interface. We define 47 * them here since we'll likely be the only driver to ever use these. 48 */ 49 #define INTEL_EDP_HDR_TCON_CAP0 0x340 50 51 #define INTEL_EDP_HDR_TCON_CAP1 0x341 52 # define INTEL_EDP_HDR_TCON_2084_DECODE_CAP BIT(0) 53 # define INTEL_EDP_HDR_TCON_2020_GAMUT_CAP BIT(1) 54 # define INTEL_EDP_HDR_TCON_TONE_MAPPING_CAP BIT(2) 55 # define INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_CAP BIT(3) 56 # define INTEL_EDP_HDR_TCON_BRIGHTNESS_NITS_CAP BIT(4) 57 # define INTEL_EDP_HDR_TCON_OPTIMIZATION_CAP BIT(5) 58 # define INTEL_EDP_HDR_TCON_SDP_COLORIMETRY_CAP BIT(6) 59 # define INTEL_EDP_HDR_TCON_SRGB_TO_PANEL_GAMUT_CONVERSION_CAP BIT(7) 60 61 #define INTEL_EDP_HDR_TCON_CAP2 0x342 62 # define INTEL_EDP_SDR_TCON_BRIGHTNESS_AUX_CAP BIT(0) 63 64 #define INTEL_EDP_HDR_TCON_CAP3 0x343 65 66 #define INTEL_EDP_HDR_GETSET_CTRL_PARAMS 0x344 67 # define INTEL_EDP_HDR_TCON_2084_DECODE_ENABLE BIT(0) 68 # define INTEL_EDP_HDR_TCON_2020_GAMUT_ENABLE BIT(1) 69 # define INTEL_EDP_HDR_TCON_TONE_MAPPING_ENABLE BIT(2) 70 # define INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_ENABLE BIT(3) 71 # define INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE BIT(4) 72 # define INTEL_EDP_HDR_TCON_SRGB_TO_PANEL_GAMUT_ENABLE BIT(5) 73 /* Bit 6 is reserved */ 74 # define INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX BIT(7) 75 76 #define INTEL_EDP_HDR_CONTENT_LUMINANCE 0x346 77 #define INTEL_EDP_HDR_PANEL_LUMINANCE_OVERRIDE 0x34A 78 #define INTEL_EDP_SDR_LUMINANCE_LEVEL 0x352 79 #define INTEL_EDP_BRIGHTNESS_NITS_LSB 0x354 80 #define INTEL_EDP_BRIGHTNESS_NITS_MSB 0x355 81 #define INTEL_EDP_BRIGHTNESS_DELAY_FRAMES 0x356 82 #define INTEL_EDP_BRIGHTNESS_PER_FRAME_STEPS 0x357 83 84 #define INTEL_EDP_BRIGHTNESS_OPTIMIZATION_0 0x358 85 # define INTEL_EDP_TCON_USAGE_MASK GENMASK(0, 3) 86 # define INTEL_EDP_TCON_USAGE_UNKNOWN 0x0 87 # define INTEL_EDP_TCON_USAGE_DESKTOP 0x1 88 # define INTEL_EDP_TCON_USAGE_FULL_SCREEN_MEDIA 0x2 89 # define INTEL_EDP_TCON_USAGE_FULL_SCREEN_GAMING 0x3 90 # define INTEL_EDP_TCON_POWER_MASK BIT(4) 91 # define INTEL_EDP_TCON_POWER_DC (0 << 4) 92 # define INTEL_EDP_TCON_POWER_AC (1 << 4) 93 # define INTEL_EDP_TCON_OPTIMIZATION_STRENGTH_MASK GENMASK(5, 7) 94 95 #define INTEL_EDP_BRIGHTNESS_OPTIMIZATION_1 0x359 96 97 enum intel_dp_aux_backlight_modparam { 98 INTEL_DP_AUX_BACKLIGHT_AUTO = -1, 99 INTEL_DP_AUX_BACKLIGHT_OFF = 0, 100 INTEL_DP_AUX_BACKLIGHT_ON = 1, 101 INTEL_DP_AUX_BACKLIGHT_FORCE_VESA = 2, 102 INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL = 3, 103 }; 104 105 static bool is_intel_tcon_cap(const u8 tcon_cap[4]) 106 { 107 return tcon_cap[0] >= 1; 108 } 109 110 /* Intel EDP backlight callbacks */ 111 static bool 112 intel_dp_aux_supports_hdr_backlight(struct intel_connector *connector) 113 { 114 struct intel_display *display = to_intel_display(connector); 115 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 116 struct drm_dp_aux *aux = &intel_dp->aux; 117 struct intel_panel *panel = &connector->panel; 118 int ret; 119 u8 tcon_cap[4]; 120 121 intel_dp_wait_source_oui(intel_dp); 122 123 ret = drm_dp_dpcd_read(aux, INTEL_EDP_HDR_TCON_CAP0, tcon_cap, sizeof(tcon_cap)); 124 if (ret != sizeof(tcon_cap)) 125 return false; 126 127 drm_dbg_kms(display->drm, 128 "[CONNECTOR:%d:%s] Detected %s HDR backlight interface version %d\n", 129 connector->base.base.id, connector->base.name, 130 is_intel_tcon_cap(tcon_cap) ? "Intel" : "unsupported", tcon_cap[0]); 131 132 if (!is_intel_tcon_cap(tcon_cap)) 133 return false; 134 135 if (!(tcon_cap[1] & INTEL_EDP_HDR_TCON_BRIGHTNESS_NITS_CAP)) 136 return false; 137 138 /* 139 * If we don't have HDR static metadata there is no way to 140 * runtime detect used range for nits based control. For now 141 * do not use Intel proprietary eDP backlight control if we 142 * don't have this data in panel EDID. In case we find panel 143 * which supports only nits based control, but doesn't provide 144 * HDR static metadata we need to start maintaining table of 145 * ranges for such panels. 146 */ 147 if (display->params.enable_dpcd_backlight != INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL && 148 !(connector->base.display_info.hdr_sink_metadata.hdmi_type1.metadata_type & 149 BIT(HDMI_STATIC_METADATA_TYPE1))) { 150 drm_info(display->drm, 151 "[CONNECTOR:%d:%s] Panel is missing HDR static metadata. Possible support for Intel HDR backlight interface is not used. If your backlight controls don't work try booting with i915.enable_dpcd_backlight=%d.\n", 152 connector->base.base.id, connector->base.name, 153 INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL); 154 return false; 155 } 156 157 panel->backlight.edp.intel_cap.sdr_uses_aux = 158 tcon_cap[2] & INTEL_EDP_SDR_TCON_BRIGHTNESS_AUX_CAP; 159 panel->backlight.edp.intel_cap.supports_2084_decode = 160 tcon_cap[1] & INTEL_EDP_HDR_TCON_2084_DECODE_CAP; 161 panel->backlight.edp.intel_cap.supports_2020_gamut = 162 tcon_cap[1] & INTEL_EDP_HDR_TCON_2020_GAMUT_CAP; 163 panel->backlight.edp.intel_cap.supports_segmented_backlight = 164 tcon_cap[1] & INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_CAP; 165 panel->backlight.edp.intel_cap.supports_sdp_colorimetry = 166 tcon_cap[1] & INTEL_EDP_HDR_TCON_SDP_COLORIMETRY_CAP; 167 panel->backlight.edp.intel_cap.supports_tone_mapping = 168 tcon_cap[1] & INTEL_EDP_HDR_TCON_TONE_MAPPING_CAP; 169 170 return true; 171 } 172 173 static u32 174 intel_dp_aux_hdr_get_backlight(struct intel_connector *connector, enum pipe pipe) 175 { 176 struct intel_display *display = to_intel_display(connector); 177 struct intel_panel *panel = &connector->panel; 178 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 179 u8 tmp; 180 u8 buf[2] = {}; 181 182 if (drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &tmp) != 1) { 183 drm_err(display->drm, 184 "[CONNECTOR:%d:%s] Failed to read current backlight mode from DPCD\n", 185 connector->base.base.id, connector->base.name); 186 return 0; 187 } 188 189 if (!(tmp & INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE)) { 190 if (!panel->backlight.edp.intel_cap.sdr_uses_aux) { 191 u32 pwm_level = panel->backlight.pwm_funcs->get(connector, pipe); 192 193 return intel_backlight_level_from_pwm(connector, pwm_level); 194 } 195 196 /* Assume 100% brightness if backlight controls aren't enabled yet */ 197 return panel->backlight.max; 198 } 199 200 if (drm_dp_dpcd_read(&intel_dp->aux, INTEL_EDP_BRIGHTNESS_NITS_LSB, buf, 201 sizeof(buf)) != sizeof(buf)) { 202 drm_err(display->drm, 203 "[CONNECTOR:%d:%s] Failed to read brightness from DPCD\n", 204 connector->base.base.id, connector->base.name); 205 return 0; 206 } 207 208 return (buf[1] << 8 | buf[0]); 209 } 210 211 static void 212 intel_dp_aux_hdr_set_aux_backlight(const struct drm_connector_state *conn_state, u32 level) 213 { 214 struct intel_connector *connector = to_intel_connector(conn_state->connector); 215 struct drm_device *dev = connector->base.dev; 216 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 217 u8 buf[4] = {}; 218 219 buf[0] = level & 0xFF; 220 buf[1] = (level & 0xFF00) >> 8; 221 222 if (drm_dp_dpcd_write(&intel_dp->aux, INTEL_EDP_BRIGHTNESS_NITS_LSB, buf, 223 sizeof(buf)) != sizeof(buf)) 224 drm_err(dev, "[CONNECTOR:%d:%s] Failed to write brightness level to DPCD\n", 225 connector->base.base.id, connector->base.name); 226 } 227 228 static void 229 intel_dp_aux_hdr_set_backlight(const struct drm_connector_state *conn_state, u32 level) 230 { 231 struct intel_connector *connector = to_intel_connector(conn_state->connector); 232 struct intel_panel *panel = &connector->panel; 233 234 if (intel_dp_in_hdr_mode(conn_state) || 235 panel->backlight.edp.intel_cap.sdr_uses_aux) { 236 intel_dp_aux_hdr_set_aux_backlight(conn_state, level); 237 } else { 238 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level); 239 240 intel_backlight_set_pwm_level(conn_state, pwm_level); 241 } 242 } 243 244 static void 245 intel_dp_aux_write_content_luminance(struct intel_connector *connector, 246 struct hdr_output_metadata *hdr_metadata) 247 { 248 struct intel_display *display = to_intel_display(connector); 249 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 250 int ret; 251 u8 buf[4]; 252 253 if (!intel_dp_has_gamut_metadata_dip(connector->encoder)) 254 return; 255 256 buf[0] = hdr_metadata->hdmi_metadata_type1.max_cll & 0xFF; 257 buf[1] = (hdr_metadata->hdmi_metadata_type1.max_cll & 0xFF00) >> 8; 258 buf[2] = hdr_metadata->hdmi_metadata_type1.max_fall & 0xFF; 259 buf[3] = (hdr_metadata->hdmi_metadata_type1.max_fall & 0xFF00) >> 8; 260 261 ret = drm_dp_dpcd_write(&intel_dp->aux, 262 INTEL_EDP_HDR_CONTENT_LUMINANCE, 263 buf, sizeof(buf)); 264 if (ret < 0) 265 drm_dbg_kms(display->drm, 266 "Content Luminance DPCD reg write failed, err:-%d\n", 267 ret); 268 } 269 270 static void 271 intel_dp_aux_fill_hdr_tcon_params(const struct drm_connector_state *conn_state, u8 *ctrl) 272 { 273 struct intel_connector *connector = to_intel_connector(conn_state->connector); 274 struct intel_panel *panel = &connector->panel; 275 struct intel_display *display = to_intel_display(connector); 276 277 /* 278 * According to spec segmented backlight needs to be set whenever panel is in 279 * HDR mode. 280 */ 281 if (intel_dp_in_hdr_mode(conn_state)) { 282 *ctrl |= INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_ENABLE; 283 *ctrl |= INTEL_EDP_HDR_TCON_2084_DECODE_ENABLE; 284 } 285 286 if (DISPLAY_VER(display) < 11) 287 *ctrl &= ~INTEL_EDP_HDR_TCON_TONE_MAPPING_ENABLE; 288 289 if (panel->backlight.edp.intel_cap.supports_2020_gamut && 290 (conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_RGB || 291 conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_YCC || 292 conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_CYCC)) 293 *ctrl |= INTEL_EDP_HDR_TCON_2020_GAMUT_ENABLE; 294 295 if (panel->backlight.edp.intel_cap.supports_sdp_colorimetry && 296 intel_dp_has_gamut_metadata_dip(connector->encoder)) 297 *ctrl |= INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX; 298 else 299 *ctrl &= ~INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX; 300 } 301 302 static void 303 intel_dp_aux_hdr_enable_backlight(const struct intel_crtc_state *crtc_state, 304 const struct drm_connector_state *conn_state, u32 level) 305 { 306 struct intel_display *display = to_intel_display(crtc_state); 307 struct intel_connector *connector = to_intel_connector(conn_state->connector); 308 struct intel_panel *panel = &connector->panel; 309 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 310 struct hdr_output_metadata *hdr_metadata; 311 int ret; 312 u8 old_ctrl, ctrl; 313 314 intel_dp_wait_source_oui(intel_dp); 315 316 ret = drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &old_ctrl); 317 if (ret != 1) { 318 drm_err(display->drm, 319 "[CONNECTOR:%d:%s] Failed to read current backlight control mode: %d\n", 320 connector->base.base.id, connector->base.name, ret); 321 return; 322 } 323 324 ctrl = old_ctrl; 325 if (intel_dp_in_hdr_mode(conn_state) || 326 panel->backlight.edp.intel_cap.sdr_uses_aux) { 327 ctrl |= INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE; 328 329 intel_dp_aux_hdr_set_aux_backlight(conn_state, level); 330 } else { 331 u32 pwm_level = intel_backlight_level_to_pwm(connector, level); 332 333 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level); 334 335 ctrl &= ~INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE; 336 } 337 338 intel_dp_aux_fill_hdr_tcon_params(conn_state, &ctrl); 339 340 if (ctrl != old_ctrl && 341 drm_dp_dpcd_writeb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, ctrl) != 1) 342 drm_err(display->drm, 343 "[CONNECTOR:%d:%s] Failed to configure DPCD brightness controls\n", 344 connector->base.base.id, connector->base.name); 345 346 if (intel_dp_in_hdr_mode(conn_state)) { 347 hdr_metadata = conn_state->hdr_output_metadata->data; 348 intel_dp_aux_write_content_luminance(connector, hdr_metadata); 349 } 350 } 351 352 static void 353 intel_dp_aux_hdr_disable_backlight(const struct drm_connector_state *conn_state, u32 level) 354 { 355 struct intel_connector *connector = to_intel_connector(conn_state->connector); 356 struct intel_panel *panel = &connector->panel; 357 358 /* Nothing to do for AUX based backlight controls */ 359 if (panel->backlight.edp.intel_cap.sdr_uses_aux) 360 return; 361 362 /* Note we want the actual pwm_level to be 0, regardless of pwm_min */ 363 panel->backlight.pwm_funcs->disable(conn_state, intel_backlight_invert_pwm_level(connector, 0)); 364 } 365 366 static const char *dpcd_vs_pwm_str(bool aux) 367 { 368 return aux ? "DPCD" : "PWM"; 369 } 370 371 static const char *backlight_unit_str(struct intel_panel *panel) 372 { 373 if (panel->backlight.edp.vesa.info.luminance_set) 374 return "NITS"; 375 else if (panel->backlight.edp.vesa.info.aux_set) 376 return "Brightness %"; 377 else 378 return "PWM"; 379 } 380 381 static void 382 intel_dp_aux_write_panel_luminance_override(struct intel_connector *connector) 383 { 384 struct intel_display *display = to_intel_display(connector); 385 struct intel_panel *panel = &connector->panel; 386 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 387 int ret; 388 u8 buf[4] = {}; 389 390 buf[0] = panel->backlight.min & 0xFF; 391 buf[1] = (panel->backlight.min & 0xFF00) >> 8; 392 buf[2] = panel->backlight.max & 0xFF; 393 buf[3] = (panel->backlight.max & 0xFF00) >> 8; 394 395 ret = drm_dp_dpcd_write(&intel_dp->aux, 396 INTEL_EDP_HDR_PANEL_LUMINANCE_OVERRIDE, 397 buf, sizeof(buf)); 398 if (ret < 0) 399 drm_dbg_kms(display->drm, 400 "Panel Luminance DPCD reg write failed, err:-%d\n", 401 ret); 402 } 403 404 static int 405 intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pipe) 406 { 407 struct intel_display *display = to_intel_display(connector); 408 struct intel_panel *panel = &connector->panel; 409 struct drm_luminance_range_info *luminance_range = 410 &connector->base.display_info.luminance_range; 411 int ret; 412 413 drm_dbg_kms(display->drm, 414 "[CONNECTOR:%d:%s] SDR backlight is controlled through %s\n", 415 connector->base.base.id, connector->base.name, 416 dpcd_vs_pwm_str(panel->backlight.edp.intel_cap.sdr_uses_aux)); 417 418 if (!panel->backlight.edp.intel_cap.sdr_uses_aux) { 419 ret = panel->backlight.pwm_funcs->setup(connector, pipe); 420 if (ret < 0) { 421 drm_err(display->drm, 422 "[CONNECTOR:%d:%s] Failed to setup SDR backlight controls through PWM: %d\n", 423 connector->base.base.id, connector->base.name, ret); 424 return ret; 425 } 426 } 427 428 if (luminance_range->max_luminance) { 429 panel->backlight.max = luminance_range->max_luminance; 430 panel->backlight.min = luminance_range->min_luminance; 431 } else { 432 panel->backlight.max = 512; 433 panel->backlight.min = 0; 434 } 435 436 intel_dp_aux_write_panel_luminance_override(connector); 437 438 drm_dbg_kms(display->drm, 439 "[CONNECTOR:%d:%s] Using AUX HDR interface for backlight control (range %d..%d)\n", 440 connector->base.base.id, connector->base.name, 441 panel->backlight.min, panel->backlight.max); 442 443 panel->backlight.level = intel_dp_aux_hdr_get_backlight(connector, pipe); 444 panel->backlight.enabled = panel->backlight.level != 0; 445 446 return 0; 447 } 448 449 /* VESA backlight callbacks */ 450 static u32 intel_dp_aux_vesa_get_backlight(struct intel_connector *connector, enum pipe unused) 451 { 452 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 453 struct intel_panel *panel = &connector->panel; 454 u8 buf[3]; 455 u32 val = 0; 456 int ret; 457 458 if (panel->backlight.edp.vesa.luminance_control_support) { 459 ret = drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE, buf, 460 sizeof(buf)); 461 if (ret < 0) { 462 drm_err(intel_dp->aux.drm_dev, 463 "[CONNECTOR:%d:%s] Failed to read Luminance from DPCD\n", 464 connector->base.base.id, connector->base.name); 465 return 0; 466 } 467 468 val |= buf[0] | buf[1] << 8 | buf[2] << 16; 469 return val / 1000; 470 } 471 472 return panel->backlight.level; 473 } 474 475 static void 476 intel_dp_aux_vesa_set_backlight(const struct drm_connector_state *conn_state, u32 level) 477 { 478 struct intel_connector *connector = to_intel_connector(conn_state->connector); 479 struct intel_panel *panel = &connector->panel; 480 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 481 482 if (!panel->backlight.edp.vesa.info.aux_set) { 483 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level); 484 485 intel_backlight_set_pwm_level(conn_state, pwm_level); 486 } 487 488 drm_edp_backlight_set_level(&intel_dp->aux, &panel->backlight.edp.vesa.info, level); 489 } 490 491 static void 492 intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state, 493 const struct drm_connector_state *conn_state, u32 level) 494 { 495 struct intel_connector *connector = to_intel_connector(conn_state->connector); 496 struct intel_panel *panel = &connector->panel; 497 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 498 499 if (!(panel->backlight.edp.vesa.info.aux_enable || 500 panel->backlight.edp.vesa.info.luminance_set)) { 501 u32 pwm_level; 502 503 if (!panel->backlight.edp.vesa.info.aux_set) 504 pwm_level = intel_backlight_level_to_pwm(connector, level); 505 else 506 pwm_level = intel_backlight_invert_pwm_level(connector, 507 panel->backlight.pwm_level_max); 508 509 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level); 510 } 511 512 drm_edp_backlight_enable(&intel_dp->aux, &panel->backlight.edp.vesa.info, level); 513 } 514 515 static void intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state *old_conn_state, 516 u32 level) 517 { 518 struct intel_connector *connector = to_intel_connector(old_conn_state->connector); 519 struct intel_panel *panel = &connector->panel; 520 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 521 522 drm_edp_backlight_disable(&intel_dp->aux, &panel->backlight.edp.vesa.info); 523 524 if (!(panel->backlight.edp.vesa.info.aux_enable || 525 panel->backlight.edp.vesa.info.luminance_set)) 526 panel->backlight.pwm_funcs->disable(old_conn_state, 527 intel_backlight_invert_pwm_level(connector, 0)); 528 } 529 530 static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector, enum pipe pipe) 531 { 532 struct intel_display *display = to_intel_display(connector); 533 struct drm_luminance_range_info *luminance_range = 534 &connector->base.display_info.luminance_range; 535 struct intel_dp *intel_dp = intel_attached_dp(connector); 536 struct intel_panel *panel = &connector->panel; 537 u32 current_level; 538 u8 current_mode; 539 int ret; 540 541 ret = drm_edp_backlight_init(&intel_dp->aux, &panel->backlight.edp.vesa.info, 542 luminance_range->max_luminance, 543 panel->vbt.backlight.pwm_freq_hz, 544 intel_dp->edp_dpcd, ¤t_level, ¤t_mode, 545 panel->backlight.edp.vesa.luminance_control_support); 546 if (ret < 0) 547 return ret; 548 549 drm_dbg_kms(display->drm, 550 "[CONNECTOR:%d:%s] AUX VESA backlight enable is controlled through %s\n", 551 connector->base.base.id, connector->base.name, 552 dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_enable || 553 panel->backlight.edp.vesa.info.luminance_set)); 554 drm_dbg_kms(display->drm, 555 "[CONNECTOR:%d:%s] AUX VESA backlight level is controlled through %s using %s values\n", 556 connector->base.base.id, connector->base.name, 557 dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_set || 558 panel->backlight.edp.vesa.info.luminance_set), 559 backlight_unit_str(panel)); 560 561 if (!panel->backlight.edp.vesa.info.aux_set || 562 !panel->backlight.edp.vesa.info.aux_enable) { 563 ret = panel->backlight.pwm_funcs->setup(connector, pipe); 564 if (ret < 0) { 565 drm_err(display->drm, 566 "[CONNECTOR:%d:%s] Failed to setup PWM backlight controls for eDP backlight: %d\n", 567 connector->base.base.id, connector->base.name, ret); 568 return ret; 569 } 570 } 571 572 if (panel->backlight.edp.vesa.info.luminance_set) { 573 if (luminance_range->max_luminance) { 574 panel->backlight.max = panel->backlight.edp.vesa.info.max; 575 panel->backlight.min = luminance_range->min_luminance; 576 } else { 577 panel->backlight.max = 512; 578 panel->backlight.min = 0; 579 } 580 panel->backlight.level = intel_dp_aux_vesa_get_backlight(connector, 0); 581 panel->backlight.enabled = panel->backlight.level != 0; 582 } else if (panel->backlight.edp.vesa.info.aux_set) { 583 panel->backlight.max = panel->backlight.edp.vesa.info.max; 584 panel->backlight.min = 0; 585 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) { 586 panel->backlight.level = current_level; 587 panel->backlight.enabled = panel->backlight.level != 0; 588 } else { 589 panel->backlight.level = panel->backlight.max; 590 panel->backlight.enabled = false; 591 } 592 } else { 593 panel->backlight.max = panel->backlight.pwm_level_max; 594 panel->backlight.min = panel->backlight.pwm_level_min; 595 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_PWM) { 596 panel->backlight.level = 597 panel->backlight.pwm_funcs->get(connector, pipe); 598 panel->backlight.enabled = panel->backlight.pwm_enabled; 599 } else { 600 panel->backlight.level = panel->backlight.max; 601 panel->backlight.enabled = false; 602 } 603 } 604 605 drm_dbg_kms(display->drm, 606 "[CONNECTOR:%d:%s] Using AUX VESA interface for backlight control\n", 607 connector->base.base.id, connector->base.name); 608 609 return 0; 610 } 611 612 static bool 613 check_if_vesa_backlight_possible(struct intel_dp *intel_dp) 614 { 615 int ret; 616 u8 bit_min, bit_max; 617 618 /* 619 * Since we only support Fully AUX Based VESA Backlight interface make sure 620 * backlight enable is possible via AUX along with backlight adjustment 621 */ 622 if (!(intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP && 623 intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)) 624 return false; 625 626 ret = drm_dp_dpcd_read_byte(&intel_dp->aux, DP_EDP_PWMGEN_BIT_COUNT_CAP_MIN, &bit_min); 627 if (ret < 0) 628 return false; 629 630 bit_min &= DP_EDP_PWMGEN_BIT_COUNT_MASK; 631 if (bit_min < 1) 632 return false; 633 634 ret = drm_dp_dpcd_read_byte(&intel_dp->aux, DP_EDP_PWMGEN_BIT_COUNT_CAP_MAX, &bit_max); 635 if (ret < 0) 636 return false; 637 638 bit_max &= DP_EDP_PWMGEN_BIT_COUNT_MASK; 639 if (bit_max < bit_min) 640 return false; 641 642 return true; 643 } 644 645 static bool 646 intel_dp_aux_supports_vesa_backlight(struct intel_connector *connector) 647 { 648 struct intel_display *display = to_intel_display(connector); 649 struct intel_dp *intel_dp = intel_attached_dp(connector); 650 struct intel_panel *panel = &connector->panel; 651 652 if ((intel_dp->edp_dpcd[3] & DP_EDP_PANEL_LUMINANCE_CONTROL_CAPABLE) && 653 (intel_dp->edp_dpcd[3] & DP_EDP_SMOOTH_BRIGHTNESS_CAPABLE)) { 654 drm_dbg_kms(display->drm, 655 "[CONNECTOR:%d:%s] AUX Luminance Based Backlight Control Supported!\n", 656 connector->base.base.id, connector->base.name); 657 panel->backlight.edp.vesa.luminance_control_support = true; 658 return true; 659 } 660 661 if (drm_edp_backlight_supported(intel_dp->edp_dpcd) && 662 check_if_vesa_backlight_possible(intel_dp)) { 663 drm_dbg_kms(display->drm, 664 "[CONNECTOR:%d:%s] AUX Backlight Control Supported!\n", 665 connector->base.base.id, connector->base.name); 666 return true; 667 } 668 669 return false; 670 } 671 672 static const struct intel_panel_bl_funcs intel_dp_hdr_bl_funcs = { 673 .setup = intel_dp_aux_hdr_setup_backlight, 674 .enable = intel_dp_aux_hdr_enable_backlight, 675 .disable = intel_dp_aux_hdr_disable_backlight, 676 .set = intel_dp_aux_hdr_set_backlight, 677 .get = intel_dp_aux_hdr_get_backlight, 678 }; 679 680 static const struct intel_panel_bl_funcs intel_dp_vesa_bl_funcs = { 681 .setup = intel_dp_aux_vesa_setup_backlight, 682 .enable = intel_dp_aux_vesa_enable_backlight, 683 .disable = intel_dp_aux_vesa_disable_backlight, 684 .set = intel_dp_aux_vesa_set_backlight, 685 .get = intel_dp_aux_vesa_get_backlight, 686 }; 687 688 int intel_dp_aux_init_backlight_funcs(struct intel_connector *connector) 689 { 690 struct intel_display *display = to_intel_display(connector); 691 struct intel_dp *intel_dp = intel_attached_dp(connector); 692 struct drm_device *dev = connector->base.dev; 693 struct intel_panel *panel = &connector->panel; 694 bool try_intel_interface = false; 695 696 /* 697 * Check the VBT and user's module parameters to figure out which 698 * interfaces to probe 699 */ 700 switch (display->params.enable_dpcd_backlight) { 701 case INTEL_DP_AUX_BACKLIGHT_OFF: 702 return -ENODEV; 703 case INTEL_DP_AUX_BACKLIGHT_AUTO: 704 switch (panel->vbt.backlight.type) { 705 case INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE: 706 break; 707 case INTEL_BACKLIGHT_DISPLAY_DDI: 708 try_intel_interface = true; 709 break; 710 default: 711 return -ENODEV; 712 } 713 break; 714 case INTEL_DP_AUX_BACKLIGHT_ON: 715 if (panel->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE) 716 try_intel_interface = true; 717 718 break; 719 case INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL: 720 try_intel_interface = true; 721 break; 722 } 723 724 /* 725 * Since Intel has their own backlight control interface, the majority of machines out there 726 * using DPCD backlight controls with Intel GPUs will be using this interface as opposed to 727 * the VESA interface. However, other GPUs (such as Nvidia's) will always use the VESA 728 * interface. This means that there's quite a number of panels out there that will advertise 729 * support for both interfaces, primarily systems with Intel/Nvidia hybrid GPU setups. 730 * 731 * There's a catch to this though: on many panels that advertise support for both 732 * interfaces, the VESA backlight interface will stop working once we've programmed the 733 * panel with Intel's OUI - which is also required for us to be able to detect Intel's 734 * backlight interface at all. This means that the only sensible way for us to detect both 735 * interfaces is to probe for Intel's first, and VESA's second. 736 * 737 * Also there is a chance some VBTs may advertise false Intel backlight support even if the 738 * TCON DPCD says otherwise. This means we keep VESA interface as fallback in that case. 739 */ 740 if (try_intel_interface && intel_dp->edp_dpcd[0] <= DP_EDP_14b && 741 intel_dp_aux_supports_hdr_backlight(connector)) { 742 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using Intel proprietary eDP backlight controls\n", 743 connector->base.base.id, connector->base.name); 744 panel->backlight.funcs = &intel_dp_hdr_bl_funcs; 745 return 0; 746 } 747 748 if (intel_dp_aux_supports_vesa_backlight(connector)) { 749 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using VESA eDP backlight controls\n", 750 connector->base.base.id, connector->base.name); 751 panel->backlight.funcs = &intel_dp_vesa_bl_funcs; 752 return 0; 753 } 754 755 return -ENODEV; 756 } 757