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 <linux/kconfig.h> 38 #include "i915_drv.h" 39 #include "intel_backlight.h" 40 #include "intel_display_types.h" 41 #include "intel_dp.h" 42 #include "intel_dp_aux_backlight.h" 43 44 /* TODO: 45 * Implement HDR, right now we just implement the bare minimum to bring us back into SDR mode so we 46 * can make people's backlights work in the mean time 47 */ 48 49 /* 50 * DP AUX registers for Intel's proprietary HDR backlight interface. We define 51 * them here since we'll likely be the only driver to ever use these. 52 */ 53 #define INTEL_EDP_HDR_TCON_CAP0 0x340 54 55 #define INTEL_EDP_HDR_TCON_CAP1 0x341 56 # define INTEL_EDP_HDR_TCON_2084_DECODE_CAP BIT(0) 57 # define INTEL_EDP_HDR_TCON_2020_GAMUT_CAP BIT(1) 58 # define INTEL_EDP_HDR_TCON_TONE_MAPPING_CAP BIT(2) 59 # define INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_CAP BIT(3) 60 # define INTEL_EDP_HDR_TCON_BRIGHTNESS_NITS_CAP BIT(4) 61 # define INTEL_EDP_HDR_TCON_OPTIMIZATION_CAP BIT(5) 62 # define INTEL_EDP_HDR_TCON_SDP_COLORIMETRY_CAP BIT(6) 63 # define INTEL_EDP_HDR_TCON_SRGB_TO_PANEL_GAMUT_CONVERSION_CAP BIT(7) 64 65 #define INTEL_EDP_HDR_TCON_CAP2 0x342 66 # define INTEL_EDP_SDR_TCON_BRIGHTNESS_AUX_CAP BIT(0) 67 68 #define INTEL_EDP_HDR_TCON_CAP3 0x343 69 70 #define INTEL_EDP_HDR_GETSET_CTRL_PARAMS 0x344 71 # define INTEL_EDP_HDR_TCON_2084_DECODE_ENABLE BIT(0) 72 # define INTEL_EDP_HDR_TCON_2020_GAMUT_ENABLE BIT(1) 73 # define INTEL_EDP_HDR_TCON_TONE_MAPPING_ENABLE BIT(2) /* Pre-TGL+ */ 74 # define INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_ENABLE BIT(3) 75 # define INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE BIT(4) 76 # define INTEL_EDP_HDR_TCON_SRGB_TO_PANEL_GAMUT_ENABLE BIT(5) 77 /* Bit 6 is reserved */ 78 # define INTEL_EDP_HDR_TCON_SDP_COLORIMETRY_ENABLE BIT(7) 79 80 #define INTEL_EDP_HDR_CONTENT_LUMINANCE 0x346 /* Pre-TGL+ */ 81 #define INTEL_EDP_HDR_PANEL_LUMINANCE_OVERRIDE 0x34A 82 #define INTEL_EDP_SDR_LUMINANCE_LEVEL 0x352 83 #define INTEL_EDP_BRIGHTNESS_NITS_LSB 0x354 84 #define INTEL_EDP_BRIGHTNESS_NITS_MSB 0x355 85 #define INTEL_EDP_BRIGHTNESS_DELAY_FRAMES 0x356 86 #define INTEL_EDP_BRIGHTNESS_PER_FRAME_STEPS 0x357 87 88 #define INTEL_EDP_BRIGHTNESS_OPTIMIZATION_0 0x358 89 # define INTEL_EDP_TCON_USAGE_MASK GENMASK(0, 3) 90 # define INTEL_EDP_TCON_USAGE_UNKNOWN 0x0 91 # define INTEL_EDP_TCON_USAGE_DESKTOP 0x1 92 # define INTEL_EDP_TCON_USAGE_FULL_SCREEN_MEDIA 0x2 93 # define INTEL_EDP_TCON_USAGE_FULL_SCREEN_GAMING 0x3 94 # define INTEL_EDP_TCON_POWER_MASK BIT(4) 95 # define INTEL_EDP_TCON_POWER_DC (0 << 4) 96 # define INTEL_EDP_TCON_POWER_AC (1 << 4) 97 # define INTEL_EDP_TCON_OPTIMIZATION_STRENGTH_MASK GENMASK(5, 7) 98 99 #define INTEL_EDP_BRIGHTNESS_OPTIMIZATION_1 0x359 100 101 enum intel_dp_aux_backlight_modparam { 102 INTEL_DP_AUX_BACKLIGHT_AUTO = -1, 103 INTEL_DP_AUX_BACKLIGHT_OFF = 0, 104 INTEL_DP_AUX_BACKLIGHT_ON = 1, 105 INTEL_DP_AUX_BACKLIGHT_FORCE_VESA = 2, 106 INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL = 3, 107 }; 108 109 /* Intel EDP backlight callbacks */ 110 static bool 111 intel_dp_aux_supports_hdr_backlight(struct intel_connector *connector) 112 { 113 struct drm_i915_private *i915 = to_i915(connector->base.dev); 114 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 115 struct drm_dp_aux *aux = &intel_dp->aux; 116 struct intel_panel *panel = &connector->panel; 117 int ret; 118 u8 tcon_cap[4]; 119 120 intel_dp_wait_source_oui(intel_dp); 121 122 ret = drm_dp_dpcd_read(aux, INTEL_EDP_HDR_TCON_CAP0, tcon_cap, sizeof(tcon_cap)); 123 if (ret != sizeof(tcon_cap)) 124 return false; 125 126 if (!(tcon_cap[1] & INTEL_EDP_HDR_TCON_BRIGHTNESS_NITS_CAP)) 127 return false; 128 129 if (tcon_cap[0] >= 1) { 130 drm_dbg_kms(&i915->drm, "Detected Intel HDR backlight interface version %d\n", 131 tcon_cap[0]); 132 } else { 133 drm_dbg_kms(&i915->drm, "Detected unsupported HDR backlight interface version %d\n", 134 tcon_cap[0]); 135 return false; 136 } 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 (i915->params.enable_dpcd_backlight != INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL && 148 !(connector->base.hdr_sink_metadata.hdmi_type1.metadata_type & 149 BIT(HDMI_STATIC_METADATA_TYPE1))) { 150 drm_info(&i915->drm, 151 "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. needs this, please file a _new_ bug report on drm/i915, see " FDO_BUG_URL " for details.\n", 152 INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL); 153 return false; 154 } 155 156 panel->backlight.edp.intel.sdr_uses_aux = 157 tcon_cap[2] & INTEL_EDP_SDR_TCON_BRIGHTNESS_AUX_CAP; 158 159 return true; 160 } 161 162 static u32 163 intel_dp_aux_hdr_get_backlight(struct intel_connector *connector, enum pipe pipe) 164 { 165 struct drm_i915_private *i915 = to_i915(connector->base.dev); 166 struct intel_panel *panel = &connector->panel; 167 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 168 u8 tmp; 169 u8 buf[2] = { 0 }; 170 171 if (drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &tmp) != 1) { 172 drm_err(&i915->drm, "Failed to read current backlight mode from DPCD\n"); 173 return 0; 174 } 175 176 if (!(tmp & INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE)) { 177 if (!panel->backlight.edp.intel.sdr_uses_aux) { 178 u32 pwm_level = panel->backlight.pwm_funcs->get(connector, pipe); 179 180 return intel_backlight_level_from_pwm(connector, pwm_level); 181 } 182 183 /* Assume 100% brightness if backlight controls aren't enabled yet */ 184 return panel->backlight.max; 185 } 186 187 if (drm_dp_dpcd_read(&intel_dp->aux, INTEL_EDP_BRIGHTNESS_NITS_LSB, buf, 188 sizeof(buf)) != sizeof(buf)) { 189 drm_err(&i915->drm, "Failed to read brightness from DPCD\n"); 190 return 0; 191 } 192 193 return (buf[1] << 8 | buf[0]); 194 } 195 196 static void 197 intel_dp_aux_hdr_set_aux_backlight(const struct drm_connector_state *conn_state, u32 level) 198 { 199 struct intel_connector *connector = to_intel_connector(conn_state->connector); 200 struct drm_device *dev = connector->base.dev; 201 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 202 u8 buf[4] = { 0 }; 203 204 buf[0] = level & 0xFF; 205 buf[1] = (level & 0xFF00) >> 8; 206 207 if (drm_dp_dpcd_write(&intel_dp->aux, INTEL_EDP_BRIGHTNESS_NITS_LSB, buf, 208 sizeof(buf)) != sizeof(buf)) 209 drm_err(dev, "Failed to write brightness level to DPCD\n"); 210 } 211 212 static void 213 intel_dp_aux_hdr_set_backlight(const struct drm_connector_state *conn_state, u32 level) 214 { 215 struct intel_connector *connector = to_intel_connector(conn_state->connector); 216 struct intel_panel *panel = &connector->panel; 217 218 if (panel->backlight.edp.intel.sdr_uses_aux) { 219 intel_dp_aux_hdr_set_aux_backlight(conn_state, level); 220 } else { 221 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level); 222 223 intel_backlight_set_pwm_level(conn_state, pwm_level); 224 } 225 } 226 227 static void 228 intel_dp_aux_hdr_enable_backlight(const struct intel_crtc_state *crtc_state, 229 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 struct drm_i915_private *i915 = to_i915(connector->base.dev); 234 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 235 int ret; 236 u8 old_ctrl, ctrl; 237 238 intel_dp_wait_source_oui(intel_dp); 239 240 ret = drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &old_ctrl); 241 if (ret != 1) { 242 drm_err(&i915->drm, "Failed to read current backlight control mode: %d\n", ret); 243 return; 244 } 245 246 ctrl = old_ctrl; 247 if (panel->backlight.edp.intel.sdr_uses_aux) { 248 ctrl |= INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE; 249 intel_dp_aux_hdr_set_aux_backlight(conn_state, level); 250 } else { 251 u32 pwm_level = intel_backlight_level_to_pwm(connector, level); 252 253 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level); 254 255 ctrl &= ~INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE; 256 } 257 258 if (ctrl != old_ctrl) 259 if (drm_dp_dpcd_writeb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, ctrl) != 1) 260 drm_err(&i915->drm, "Failed to configure DPCD brightness controls\n"); 261 } 262 263 static void 264 intel_dp_aux_hdr_disable_backlight(const struct drm_connector_state *conn_state, u32 level) 265 { 266 struct intel_connector *connector = to_intel_connector(conn_state->connector); 267 struct intel_panel *panel = &connector->panel; 268 269 /* Nothing to do for AUX based backlight controls */ 270 if (panel->backlight.edp.intel.sdr_uses_aux) 271 return; 272 273 /* Note we want the actual pwm_level to be 0, regardless of pwm_min */ 274 panel->backlight.pwm_funcs->disable(conn_state, intel_backlight_invert_pwm_level(connector, 0)); 275 } 276 277 static int 278 intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pipe) 279 { 280 struct drm_i915_private *i915 = to_i915(connector->base.dev); 281 struct intel_panel *panel = &connector->panel; 282 struct drm_luminance_range_info *luminance_range = 283 &connector->base.display_info.luminance_range; 284 int ret; 285 286 if (panel->backlight.edp.intel.sdr_uses_aux) { 287 drm_dbg_kms(&i915->drm, "SDR backlight is controlled through DPCD\n"); 288 } else { 289 drm_dbg_kms(&i915->drm, "SDR backlight is controlled through PWM\n"); 290 291 ret = panel->backlight.pwm_funcs->setup(connector, pipe); 292 if (ret < 0) { 293 drm_err(&i915->drm, 294 "Failed to setup SDR backlight controls through PWM: %d\n", ret); 295 return ret; 296 } 297 } 298 299 if (luminance_range->max_luminance) { 300 panel->backlight.max = luminance_range->max_luminance; 301 panel->backlight.min = luminance_range->min_luminance; 302 } else { 303 panel->backlight.max = 512; 304 panel->backlight.min = 0; 305 } 306 307 drm_dbg_kms(&i915->drm, "Using backlight range %d..%d\n", panel->backlight.min, 308 panel->backlight.max); 309 310 panel->backlight.level = intel_dp_aux_hdr_get_backlight(connector, pipe); 311 panel->backlight.enabled = panel->backlight.level != 0; 312 313 return 0; 314 } 315 316 /* VESA backlight callbacks */ 317 static u32 intel_dp_aux_vesa_get_backlight(struct intel_connector *connector, enum pipe unused) 318 { 319 return connector->panel.backlight.level; 320 } 321 322 static void 323 intel_dp_aux_vesa_set_backlight(const struct drm_connector_state *conn_state, u32 level) 324 { 325 struct intel_connector *connector = to_intel_connector(conn_state->connector); 326 struct intel_panel *panel = &connector->panel; 327 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 328 329 if (!panel->backlight.edp.vesa.info.aux_set) { 330 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level); 331 332 intel_backlight_set_pwm_level(conn_state, pwm_level); 333 } 334 335 drm_edp_backlight_set_level(&intel_dp->aux, &panel->backlight.edp.vesa.info, level); 336 } 337 338 static void 339 intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state, 340 const struct drm_connector_state *conn_state, u32 level) 341 { 342 struct intel_connector *connector = to_intel_connector(conn_state->connector); 343 struct intel_panel *panel = &connector->panel; 344 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 345 346 if (!panel->backlight.edp.vesa.info.aux_enable) { 347 u32 pwm_level; 348 349 if (!panel->backlight.edp.vesa.info.aux_set) 350 pwm_level = intel_backlight_level_to_pwm(connector, level); 351 else 352 pwm_level = intel_backlight_invert_pwm_level(connector, 353 panel->backlight.pwm_level_max); 354 355 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level); 356 } 357 358 drm_edp_backlight_enable(&intel_dp->aux, &panel->backlight.edp.vesa.info, level); 359 } 360 361 static void intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state *old_conn_state, 362 u32 level) 363 { 364 struct intel_connector *connector = to_intel_connector(old_conn_state->connector); 365 struct intel_panel *panel = &connector->panel; 366 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 367 368 drm_edp_backlight_disable(&intel_dp->aux, &panel->backlight.edp.vesa.info); 369 370 if (!panel->backlight.edp.vesa.info.aux_enable) 371 panel->backlight.pwm_funcs->disable(old_conn_state, 372 intel_backlight_invert_pwm_level(connector, 0)); 373 } 374 375 static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector, enum pipe pipe) 376 { 377 struct intel_dp *intel_dp = intel_attached_dp(connector); 378 struct intel_panel *panel = &connector->panel; 379 struct drm_i915_private *i915 = dp_to_i915(intel_dp); 380 u16 current_level; 381 u8 current_mode; 382 int ret; 383 384 ret = drm_edp_backlight_init(&intel_dp->aux, &panel->backlight.edp.vesa.info, 385 panel->vbt.backlight.pwm_freq_hz, intel_dp->edp_dpcd, 386 ¤t_level, ¤t_mode); 387 if (ret < 0) 388 return ret; 389 390 if (!panel->backlight.edp.vesa.info.aux_set || !panel->backlight.edp.vesa.info.aux_enable) { 391 ret = panel->backlight.pwm_funcs->setup(connector, pipe); 392 if (ret < 0) { 393 drm_err(&i915->drm, 394 "Failed to setup PWM backlight controls for eDP backlight: %d\n", 395 ret); 396 return ret; 397 } 398 } 399 400 if (panel->backlight.edp.vesa.info.aux_set) { 401 panel->backlight.max = panel->backlight.edp.vesa.info.max; 402 panel->backlight.min = 0; 403 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) { 404 panel->backlight.level = current_level; 405 panel->backlight.enabled = panel->backlight.level != 0; 406 } else { 407 panel->backlight.level = panel->backlight.max; 408 panel->backlight.enabled = false; 409 } 410 } else { 411 panel->backlight.max = panel->backlight.pwm_level_max; 412 panel->backlight.min = panel->backlight.pwm_level_min; 413 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_PWM) { 414 panel->backlight.level = panel->backlight.pwm_funcs->get(connector, pipe); 415 panel->backlight.enabled = panel->backlight.pwm_enabled; 416 } else { 417 panel->backlight.level = panel->backlight.max; 418 panel->backlight.enabled = false; 419 } 420 } 421 422 return 0; 423 } 424 425 static bool 426 intel_dp_aux_supports_vesa_backlight(struct intel_connector *connector) 427 { 428 struct intel_dp *intel_dp = intel_attached_dp(connector); 429 struct drm_i915_private *i915 = dp_to_i915(intel_dp); 430 431 if (drm_edp_backlight_supported(intel_dp->edp_dpcd)) { 432 drm_dbg_kms(&i915->drm, "AUX Backlight Control Supported!\n"); 433 return true; 434 } 435 return false; 436 } 437 438 static const struct intel_panel_bl_funcs intel_dp_hdr_bl_funcs = { 439 .setup = intel_dp_aux_hdr_setup_backlight, 440 .enable = intel_dp_aux_hdr_enable_backlight, 441 .disable = intel_dp_aux_hdr_disable_backlight, 442 .set = intel_dp_aux_hdr_set_backlight, 443 .get = intel_dp_aux_hdr_get_backlight, 444 }; 445 446 static const struct intel_panel_bl_funcs intel_dp_vesa_bl_funcs = { 447 .setup = intel_dp_aux_vesa_setup_backlight, 448 .enable = intel_dp_aux_vesa_enable_backlight, 449 .disable = intel_dp_aux_vesa_disable_backlight, 450 .set = intel_dp_aux_vesa_set_backlight, 451 .get = intel_dp_aux_vesa_get_backlight, 452 }; 453 454 int intel_dp_aux_init_backlight_funcs(struct intel_connector *connector) 455 { 456 struct drm_device *dev = connector->base.dev; 457 struct intel_panel *panel = &connector->panel; 458 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); 459 struct drm_i915_private *i915 = dp_to_i915(intel_dp); 460 bool try_intel_interface = false, try_vesa_interface = false; 461 462 /* Check the VBT and user's module parameters to figure out which 463 * interfaces to probe 464 */ 465 switch (i915->params.enable_dpcd_backlight) { 466 case INTEL_DP_AUX_BACKLIGHT_OFF: 467 return -ENODEV; 468 case INTEL_DP_AUX_BACKLIGHT_AUTO: 469 switch (panel->vbt.backlight.type) { 470 case INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE: 471 try_vesa_interface = true; 472 break; 473 case INTEL_BACKLIGHT_DISPLAY_DDI: 474 try_intel_interface = true; 475 break; 476 default: 477 return -ENODEV; 478 } 479 break; 480 case INTEL_DP_AUX_BACKLIGHT_ON: 481 if (panel->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE) 482 try_intel_interface = true; 483 484 try_vesa_interface = true; 485 break; 486 case INTEL_DP_AUX_BACKLIGHT_FORCE_VESA: 487 try_vesa_interface = true; 488 break; 489 case INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL: 490 try_intel_interface = true; 491 break; 492 } 493 494 /* 495 * Since Intel has their own backlight control interface, the majority of machines out there 496 * using DPCD backlight controls with Intel GPUs will be using this interface as opposed to 497 * the VESA interface. However, other GPUs (such as Nvidia's) will always use the VESA 498 * interface. This means that there's quite a number of panels out there that will advertise 499 * support for both interfaces, primarily systems with Intel/Nvidia hybrid GPU setups. 500 * 501 * There's a catch to this though: on many panels that advertise support for both 502 * interfaces, the VESA backlight interface will stop working once we've programmed the 503 * panel with Intel's OUI - which is also required for us to be able to detect Intel's 504 * backlight interface at all. This means that the only sensible way for us to detect both 505 * interfaces is to probe for Intel's first, and VESA's second. 506 */ 507 if (try_intel_interface && intel_dp_aux_supports_hdr_backlight(connector)) { 508 drm_dbg_kms(dev, "Using Intel proprietary eDP backlight controls\n"); 509 panel->backlight.funcs = &intel_dp_hdr_bl_funcs; 510 return 0; 511 } 512 513 if (try_vesa_interface && intel_dp_aux_supports_vesa_backlight(connector)) { 514 drm_dbg_kms(dev, "Using VESA eDP backlight controls\n"); 515 panel->backlight.funcs = &intel_dp_vesa_bl_funcs; 516 return 0; 517 } 518 519 return -ENODEV; 520 } 521