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1/*2 * Copyright © 2015 Intel Corporation3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice (including the next12 * paragraph) shall be included in all copies or substantial portions of the13 * Software.14 *15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS21 * IN THE SOFTWARE.22 *23 */24 25/*26 * Laptops with Intel GPUs which have panels that support controlling the27 * backlight through DP AUX can actually use two different interfaces: Intel's28 * proprietary DP AUX backlight interface, and the standard VESA backlight29 * interface. Unfortunately, at the time of writing this a lot of laptops will30 * advertise support for the standard VESA backlight interface when they31 * don't properly support it. However, on these systems the Intel backlight32 * interface generally does work properly. Additionally, these systems will33 * usually just indicate that they use PWM backlight controls in their VBIOS34 * for some reason.35 */36 37#include "i915_drv.h"38#include "intel_backlight.h"39#include "intel_display_types.h"40#include "intel_dp.h"41#include "intel_dp_aux_backlight.h"42 43/*44 * DP AUX registers for Intel's proprietary HDR backlight interface. We define45 * them here since we'll likely be the only driver to ever use these.46 */47#define INTEL_EDP_HDR_TCON_CAP0 0x34048 49#define INTEL_EDP_HDR_TCON_CAP1 0x34150# define INTEL_EDP_HDR_TCON_2084_DECODE_CAP BIT(0)51# define INTEL_EDP_HDR_TCON_2020_GAMUT_CAP BIT(1)52# define INTEL_EDP_HDR_TCON_TONE_MAPPING_CAP BIT(2)53# define INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_CAP BIT(3)54# define INTEL_EDP_HDR_TCON_BRIGHTNESS_NITS_CAP BIT(4)55# define INTEL_EDP_HDR_TCON_OPTIMIZATION_CAP BIT(5)56# define INTEL_EDP_HDR_TCON_SDP_COLORIMETRY_CAP BIT(6)57# define INTEL_EDP_HDR_TCON_SRGB_TO_PANEL_GAMUT_CONVERSION_CAP BIT(7)58 59#define INTEL_EDP_HDR_TCON_CAP2 0x34260# define INTEL_EDP_SDR_TCON_BRIGHTNESS_AUX_CAP BIT(0)61 62#define INTEL_EDP_HDR_TCON_CAP3 0x34363 64#define INTEL_EDP_HDR_GETSET_CTRL_PARAMS 0x34465# define INTEL_EDP_HDR_TCON_2084_DECODE_ENABLE BIT(0)66# define INTEL_EDP_HDR_TCON_2020_GAMUT_ENABLE BIT(1)67# define INTEL_EDP_HDR_TCON_TONE_MAPPING_ENABLE BIT(2)68# define INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_ENABLE BIT(3)69# define INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE BIT(4)70# define INTEL_EDP_HDR_TCON_SRGB_TO_PANEL_GAMUT_ENABLE BIT(5)71/* Bit 6 is reserved */72# define INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX BIT(7)73 74#define INTEL_EDP_HDR_CONTENT_LUMINANCE 0x34675#define INTEL_EDP_HDR_PANEL_LUMINANCE_OVERRIDE 0x34A76#define INTEL_EDP_SDR_LUMINANCE_LEVEL 0x35277#define INTEL_EDP_BRIGHTNESS_NITS_LSB 0x35478#define INTEL_EDP_BRIGHTNESS_NITS_MSB 0x35579#define INTEL_EDP_BRIGHTNESS_DELAY_FRAMES 0x35680#define INTEL_EDP_BRIGHTNESS_PER_FRAME_STEPS 0x35781 82#define INTEL_EDP_BRIGHTNESS_OPTIMIZATION_0 0x35883# define INTEL_EDP_TCON_USAGE_MASK GENMASK(0, 3)84# define INTEL_EDP_TCON_USAGE_UNKNOWN 0x085# define INTEL_EDP_TCON_USAGE_DESKTOP 0x186# define INTEL_EDP_TCON_USAGE_FULL_SCREEN_MEDIA 0x287# define INTEL_EDP_TCON_USAGE_FULL_SCREEN_GAMING 0x388# define INTEL_EDP_TCON_POWER_MASK BIT(4)89# define INTEL_EDP_TCON_POWER_DC (0 << 4)90# define INTEL_EDP_TCON_POWER_AC (1 << 4)91# define INTEL_EDP_TCON_OPTIMIZATION_STRENGTH_MASK GENMASK(5, 7)92 93#define INTEL_EDP_BRIGHTNESS_OPTIMIZATION_1 0x35994 95enum intel_dp_aux_backlight_modparam {96 INTEL_DP_AUX_BACKLIGHT_AUTO = -1,97 INTEL_DP_AUX_BACKLIGHT_OFF = 0,98 INTEL_DP_AUX_BACKLIGHT_ON = 1,99 INTEL_DP_AUX_BACKLIGHT_FORCE_VESA = 2,100 INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL = 3,101};102 103static bool is_intel_tcon_cap(const u8 tcon_cap[4])104{105 return tcon_cap[0] >= 1;106}107 108/* Intel EDP backlight callbacks */109static bool110intel_dp_aux_supports_hdr_backlight(struct intel_connector *connector)111{112 struct intel_display *display = to_intel_display(connector);113 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);114 struct drm_dp_aux *aux = &intel_dp->aux;115 struct intel_panel *panel = &connector->panel;116 int ret;117 u8 tcon_cap[4];118 119 intel_dp_wait_source_oui(intel_dp);120 121 ret = drm_dp_dpcd_read(aux, INTEL_EDP_HDR_TCON_CAP0, tcon_cap, sizeof(tcon_cap));122 if (ret != sizeof(tcon_cap))123 return false;124 125 drm_dbg_kms(display->drm,126 "[CONNECTOR:%d:%s] Detected %s HDR backlight interface version %d\n",127 connector->base.base.id, connector->base.name,128 is_intel_tcon_cap(tcon_cap) ? "Intel" : "unsupported", tcon_cap[0]);129 130 if (!is_intel_tcon_cap(tcon_cap))131 return false;132 133 if (!(tcon_cap[1] & INTEL_EDP_HDR_TCON_BRIGHTNESS_NITS_CAP))134 return false;135 136 /*137 * If we don't have HDR static metadata there is no way to138 * runtime detect used range for nits based control. For now139 * do not use Intel proprietary eDP backlight control if we140 * don't have this data in panel EDID. In case we find panel141 * which supports only nits based control, but doesn't provide142 * HDR static metadata we need to start maintaining table of143 * ranges for such panels.144 */145 if (display->params.enable_dpcd_backlight != INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL &&146 !(connector->base.hdr_sink_metadata.hdmi_type1.metadata_type &147 BIT(HDMI_STATIC_METADATA_TYPE1))) {148 drm_info(display->drm,149 "[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. needs this, please file a _new_ bug report on drm/i915, see " FDO_BUG_URL " for details.\n",150 connector->base.base.id, connector->base.name,151 INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL);152 return false;153 }154 155 panel->backlight.edp.intel_cap.sdr_uses_aux =156 tcon_cap[2] & INTEL_EDP_SDR_TCON_BRIGHTNESS_AUX_CAP;157 panel->backlight.edp.intel_cap.supports_2084_decode =158 tcon_cap[1] & INTEL_EDP_HDR_TCON_2084_DECODE_CAP;159 panel->backlight.edp.intel_cap.supports_2020_gamut =160 tcon_cap[1] & INTEL_EDP_HDR_TCON_2020_GAMUT_CAP;161 panel->backlight.edp.intel_cap.supports_segmented_backlight =162 tcon_cap[1] & INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_CAP;163 panel->backlight.edp.intel_cap.supports_sdp_colorimetry =164 tcon_cap[1] & INTEL_EDP_HDR_TCON_SDP_COLORIMETRY_CAP;165 panel->backlight.edp.intel_cap.supports_tone_mapping =166 tcon_cap[1] & INTEL_EDP_HDR_TCON_TONE_MAPPING_CAP;167 168 return true;169}170 171static u32172intel_dp_aux_hdr_get_backlight(struct intel_connector *connector, enum pipe pipe)173{174 struct intel_display *display = to_intel_display(connector);175 struct intel_panel *panel = &connector->panel;176 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);177 u8 tmp;178 u8 buf[2] = {};179 180 if (drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &tmp) != 1) {181 drm_err(display->drm,182 "[CONNECTOR:%d:%s] Failed to read current backlight mode from DPCD\n",183 connector->base.base.id, connector->base.name);184 return 0;185 }186 187 if (!(tmp & INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE)) {188 if (!panel->backlight.edp.intel_cap.sdr_uses_aux) {189 u32 pwm_level = panel->backlight.pwm_funcs->get(connector, pipe);190 191 return intel_backlight_level_from_pwm(connector, pwm_level);192 }193 194 /* Assume 100% brightness if backlight controls aren't enabled yet */195 return panel->backlight.max;196 }197 198 if (drm_dp_dpcd_read(&intel_dp->aux, INTEL_EDP_BRIGHTNESS_NITS_LSB, buf,199 sizeof(buf)) != sizeof(buf)) {200 drm_err(display->drm,201 "[CONNECTOR:%d:%s] Failed to read brightness from DPCD\n",202 connector->base.base.id, connector->base.name);203 return 0;204 }205 206 return (buf[1] << 8 | buf[0]);207}208 209static void210intel_dp_aux_hdr_set_aux_backlight(const struct drm_connector_state *conn_state, u32 level)211{212 struct intel_connector *connector = to_intel_connector(conn_state->connector);213 struct drm_device *dev = connector->base.dev;214 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);215 u8 buf[4] = {};216 217 buf[0] = level & 0xFF;218 buf[1] = (level & 0xFF00) >> 8;219 220 if (drm_dp_dpcd_write(&intel_dp->aux, INTEL_EDP_BRIGHTNESS_NITS_LSB, buf,221 sizeof(buf)) != sizeof(buf))222 drm_err(dev, "[CONNECTOR:%d:%s] Failed to write brightness level to DPCD\n",223 connector->base.base.id, connector->base.name);224}225 226static bool227intel_dp_in_hdr_mode(const struct drm_connector_state *conn_state)228{229 struct hdr_output_metadata *hdr_metadata;230 231 if (!conn_state->hdr_output_metadata)232 return false;233 234 hdr_metadata = conn_state->hdr_output_metadata->data;235 236 return hdr_metadata->hdmi_metadata_type1.eotf == HDMI_EOTF_SMPTE_ST2084;237}238 239static void240intel_dp_aux_hdr_set_backlight(const struct drm_connector_state *conn_state, u32 level)241{242 struct intel_connector *connector = to_intel_connector(conn_state->connector);243 struct intel_panel *panel = &connector->panel;244 245 if (intel_dp_in_hdr_mode(conn_state) ||246 panel->backlight.edp.intel_cap.sdr_uses_aux) {247 intel_dp_aux_hdr_set_aux_backlight(conn_state, level);248 } else {249 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level);250 251 intel_backlight_set_pwm_level(conn_state, pwm_level);252 }253}254 255static void256intel_dp_aux_write_content_luminance(struct intel_connector *connector,257 struct hdr_output_metadata *hdr_metadata)258{259 struct intel_display *display = to_intel_display(connector);260 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);261 int ret;262 u8 buf[4];263 264 if (!intel_dp_has_gamut_metadata_dip(connector->encoder))265 return;266 267 buf[0] = hdr_metadata->hdmi_metadata_type1.max_cll & 0xFF;268 buf[1] = (hdr_metadata->hdmi_metadata_type1.max_cll & 0xFF00) >> 8;269 buf[2] = hdr_metadata->hdmi_metadata_type1.max_fall & 0xFF;270 buf[3] = (hdr_metadata->hdmi_metadata_type1.max_fall & 0xFF00) >> 8;271 272 ret = drm_dp_dpcd_write(&intel_dp->aux,273 INTEL_EDP_HDR_CONTENT_LUMINANCE,274 buf, sizeof(buf));275 if (ret < 0)276 drm_dbg_kms(display->drm,277 "Content Luminance DPCD reg write failed, err:-%d\n",278 ret);279}280 281static void282intel_dp_aux_fill_hdr_tcon_params(const struct drm_connector_state *conn_state, u8 *ctrl)283{284 struct intel_connector *connector = to_intel_connector(conn_state->connector);285 struct intel_panel *panel = &connector->panel;286 struct intel_display *display = to_intel_display(connector);287 288 /*289 * According to spec segmented backlight needs to be set whenever panel is in290 * HDR mode.291 */292 if (intel_dp_in_hdr_mode(conn_state)) {293 *ctrl |= INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_ENABLE;294 *ctrl |= INTEL_EDP_HDR_TCON_2084_DECODE_ENABLE;295 }296 297 if (DISPLAY_VER(display) < 11)298 *ctrl &= ~INTEL_EDP_HDR_TCON_TONE_MAPPING_ENABLE;299 300 if (panel->backlight.edp.intel_cap.supports_2020_gamut &&301 (conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_RGB ||302 conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_YCC ||303 conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_CYCC))304 *ctrl |= INTEL_EDP_HDR_TCON_2020_GAMUT_ENABLE;305 306 if (panel->backlight.edp.intel_cap.supports_sdp_colorimetry &&307 intel_dp_has_gamut_metadata_dip(connector->encoder))308 *ctrl |= INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX;309 else310 *ctrl &= ~INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX;311}312 313static void314intel_dp_aux_hdr_enable_backlight(const struct intel_crtc_state *crtc_state,315 const struct drm_connector_state *conn_state, u32 level)316{317 struct intel_display *display = to_intel_display(crtc_state);318 struct intel_connector *connector = to_intel_connector(conn_state->connector);319 struct intel_panel *panel = &connector->panel;320 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);321 struct hdr_output_metadata *hdr_metadata;322 int ret;323 u8 old_ctrl, ctrl;324 325 intel_dp_wait_source_oui(intel_dp);326 327 ret = drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &old_ctrl);328 if (ret != 1) {329 drm_err(display->drm,330 "[CONNECTOR:%d:%s] Failed to read current backlight control mode: %d\n",331 connector->base.base.id, connector->base.name, ret);332 return;333 }334 335 ctrl = old_ctrl;336 if (intel_dp_in_hdr_mode(conn_state) ||337 panel->backlight.edp.intel_cap.sdr_uses_aux) {338 ctrl |= INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE;339 340 intel_dp_aux_hdr_set_aux_backlight(conn_state, level);341 } else {342 u32 pwm_level = intel_backlight_level_to_pwm(connector, level);343 344 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);345 346 ctrl &= ~INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE;347 }348 349 intel_dp_aux_fill_hdr_tcon_params(conn_state, &ctrl);350 351 if (ctrl != old_ctrl &&352 drm_dp_dpcd_writeb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, ctrl) != 1)353 drm_err(display->drm,354 "[CONNECTOR:%d:%s] Failed to configure DPCD brightness controls\n",355 connector->base.base.id, connector->base.name);356 357 if (intel_dp_in_hdr_mode(conn_state)) {358 hdr_metadata = conn_state->hdr_output_metadata->data;359 intel_dp_aux_write_content_luminance(connector, hdr_metadata);360 }361}362 363static void364intel_dp_aux_hdr_disable_backlight(const struct drm_connector_state *conn_state, u32 level)365{366 struct intel_connector *connector = to_intel_connector(conn_state->connector);367 struct intel_panel *panel = &connector->panel;368 369 /* Nothing to do for AUX based backlight controls */370 if (panel->backlight.edp.intel_cap.sdr_uses_aux)371 return;372 373 /* Note we want the actual pwm_level to be 0, regardless of pwm_min */374 panel->backlight.pwm_funcs->disable(conn_state, intel_backlight_invert_pwm_level(connector, 0));375}376 377static const char *dpcd_vs_pwm_str(bool aux)378{379 return aux ? "DPCD" : "PWM";380}381 382static void383intel_dp_aux_write_panel_luminance_override(struct intel_connector *connector)384{385 struct intel_display *display = to_intel_display(connector);386 struct intel_panel *panel = &connector->panel;387 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);388 int ret;389 u8 buf[4] = {};390 391 buf[0] = panel->backlight.min & 0xFF;392 buf[1] = (panel->backlight.min & 0xFF00) >> 8;393 buf[2] = panel->backlight.max & 0xFF;394 buf[3] = (panel->backlight.max & 0xFF00) >> 8;395 396 ret = drm_dp_dpcd_write(&intel_dp->aux,397 INTEL_EDP_HDR_PANEL_LUMINANCE_OVERRIDE,398 buf, sizeof(buf));399 if (ret < 0)400 drm_dbg_kms(display->drm,401 "Panel Luminance DPCD reg write failed, err:-%d\n",402 ret);403}404 405static int406intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pipe)407{408 struct intel_display *display = to_intel_display(connector);409 struct intel_panel *panel = &connector->panel;410 struct drm_luminance_range_info *luminance_range =411 &connector->base.display_info.luminance_range;412 int ret;413 414 drm_dbg_kms(display->drm,415 "[CONNECTOR:%d:%s] SDR backlight is controlled through %s\n",416 connector->base.base.id, connector->base.name,417 dpcd_vs_pwm_str(panel->backlight.edp.intel_cap.sdr_uses_aux));418 419 if (!panel->backlight.edp.intel_cap.sdr_uses_aux) {420 ret = panel->backlight.pwm_funcs->setup(connector, pipe);421 if (ret < 0) {422 drm_err(display->drm,423 "[CONNECTOR:%d:%s] Failed to setup SDR backlight controls through PWM: %d\n",424 connector->base.base.id, connector->base.name, ret);425 return ret;426 }427 }428 429 if (luminance_range->max_luminance) {430 panel->backlight.max = luminance_range->max_luminance;431 panel->backlight.min = luminance_range->min_luminance;432 } else {433 panel->backlight.max = 512;434 panel->backlight.min = 0;435 }436 437 intel_dp_aux_write_panel_luminance_override(connector);438 439 drm_dbg_kms(display->drm,440 "[CONNECTOR:%d:%s] Using AUX HDR interface for backlight control (range %d..%d)\n",441 connector->base.base.id, connector->base.name,442 panel->backlight.min, panel->backlight.max);443 444 panel->backlight.level = intel_dp_aux_hdr_get_backlight(connector, pipe);445 panel->backlight.enabled = panel->backlight.level != 0;446 447 return 0;448}449 450/* VESA backlight callbacks */451static u32 intel_dp_aux_vesa_get_backlight(struct intel_connector *connector, enum pipe unused)452{453 return connector->panel.backlight.level;454}455 456static void457intel_dp_aux_vesa_set_backlight(const struct drm_connector_state *conn_state, u32 level)458{459 struct intel_connector *connector = to_intel_connector(conn_state->connector);460 struct intel_panel *panel = &connector->panel;461 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);462 463 if (!panel->backlight.edp.vesa.info.aux_set) {464 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level);465 466 intel_backlight_set_pwm_level(conn_state, pwm_level);467 }468 469 drm_edp_backlight_set_level(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);470}471 472static void473intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state,474 const struct drm_connector_state *conn_state, u32 level)475{476 struct intel_connector *connector = to_intel_connector(conn_state->connector);477 struct intel_panel *panel = &connector->panel;478 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);479 480 if (!panel->backlight.edp.vesa.info.aux_enable) {481 u32 pwm_level;482 483 if (!panel->backlight.edp.vesa.info.aux_set)484 pwm_level = intel_backlight_level_to_pwm(connector, level);485 else486 pwm_level = intel_backlight_invert_pwm_level(connector,487 panel->backlight.pwm_level_max);488 489 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);490 }491 492 drm_edp_backlight_enable(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);493}494 495static void intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state *old_conn_state,496 u32 level)497{498 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);499 struct intel_panel *panel = &connector->panel;500 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);501 502 drm_edp_backlight_disable(&intel_dp->aux, &panel->backlight.edp.vesa.info);503 504 if (!panel->backlight.edp.vesa.info.aux_enable)505 panel->backlight.pwm_funcs->disable(old_conn_state,506 intel_backlight_invert_pwm_level(connector, 0));507}508 509static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector, enum pipe pipe)510{511 struct intel_display *display = to_intel_display(connector);512 struct intel_dp *intel_dp = intel_attached_dp(connector);513 struct intel_panel *panel = &connector->panel;514 u16 current_level;515 u8 current_mode;516 int ret;517 518 ret = drm_edp_backlight_init(&intel_dp->aux, &panel->backlight.edp.vesa.info,519 panel->vbt.backlight.pwm_freq_hz, intel_dp->edp_dpcd,520 ¤t_level, ¤t_mode);521 if (ret < 0)522 return ret;523 524 drm_dbg_kms(display->drm,525 "[CONNECTOR:%d:%s] AUX VESA backlight enable is controlled through %s\n",526 connector->base.base.id, connector->base.name,527 dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_enable));528 drm_dbg_kms(display->drm,529 "[CONNECTOR:%d:%s] AUX VESA backlight level is controlled through %s\n",530 connector->base.base.id, connector->base.name,531 dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_set));532 533 if (!panel->backlight.edp.vesa.info.aux_set || !panel->backlight.edp.vesa.info.aux_enable) {534 ret = panel->backlight.pwm_funcs->setup(connector, pipe);535 if (ret < 0) {536 drm_err(display->drm,537 "[CONNECTOR:%d:%s] Failed to setup PWM backlight controls for eDP backlight: %d\n",538 connector->base.base.id, connector->base.name, ret);539 return ret;540 }541 }542 543 if (panel->backlight.edp.vesa.info.aux_set) {544 panel->backlight.max = panel->backlight.edp.vesa.info.max;545 panel->backlight.min = 0;546 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {547 panel->backlight.level = current_level;548 panel->backlight.enabled = panel->backlight.level != 0;549 } else {550 panel->backlight.level = panel->backlight.max;551 panel->backlight.enabled = false;552 }553 } else {554 panel->backlight.max = panel->backlight.pwm_level_max;555 panel->backlight.min = panel->backlight.pwm_level_min;556 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_PWM) {557 panel->backlight.level = panel->backlight.pwm_funcs->get(connector, pipe);558 panel->backlight.enabled = panel->backlight.pwm_enabled;559 } else {560 panel->backlight.level = panel->backlight.max;561 panel->backlight.enabled = false;562 }563 }564 565 drm_dbg_kms(display->drm,566 "[CONNECTOR:%d:%s] Using AUX VESA interface for backlight control\n",567 connector->base.base.id, connector->base.name);568 569 return 0;570}571 572static bool573intel_dp_aux_supports_vesa_backlight(struct intel_connector *connector)574{575 struct intel_display *display = to_intel_display(connector);576 struct intel_dp *intel_dp = intel_attached_dp(connector);577 578 if (drm_edp_backlight_supported(intel_dp->edp_dpcd)) {579 drm_dbg_kms(display->drm,580 "[CONNECTOR:%d:%s] AUX Backlight Control Supported!\n",581 connector->base.base.id, connector->base.name);582 return true;583 }584 return false;585}586 587static const struct intel_panel_bl_funcs intel_dp_hdr_bl_funcs = {588 .setup = intel_dp_aux_hdr_setup_backlight,589 .enable = intel_dp_aux_hdr_enable_backlight,590 .disable = intel_dp_aux_hdr_disable_backlight,591 .set = intel_dp_aux_hdr_set_backlight,592 .get = intel_dp_aux_hdr_get_backlight,593};594 595static const struct intel_panel_bl_funcs intel_dp_vesa_bl_funcs = {596 .setup = intel_dp_aux_vesa_setup_backlight,597 .enable = intel_dp_aux_vesa_enable_backlight,598 .disable = intel_dp_aux_vesa_disable_backlight,599 .set = intel_dp_aux_vesa_set_backlight,600 .get = intel_dp_aux_vesa_get_backlight,601};602 603int intel_dp_aux_init_backlight_funcs(struct intel_connector *connector)604{605 struct intel_display *display = to_intel_display(connector);606 struct drm_device *dev = connector->base.dev;607 struct intel_panel *panel = &connector->panel;608 bool try_intel_interface = false, try_vesa_interface = false;609 610 /* Check the VBT and user's module parameters to figure out which611 * interfaces to probe612 */613 switch (display->params.enable_dpcd_backlight) {614 case INTEL_DP_AUX_BACKLIGHT_OFF:615 return -ENODEV;616 case INTEL_DP_AUX_BACKLIGHT_AUTO:617 switch (panel->vbt.backlight.type) {618 case INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE:619 try_vesa_interface = true;620 break;621 case INTEL_BACKLIGHT_DISPLAY_DDI:622 try_intel_interface = true;623 break;624 default:625 return -ENODEV;626 }627 break;628 case INTEL_DP_AUX_BACKLIGHT_ON:629 if (panel->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE)630 try_intel_interface = true;631 632 try_vesa_interface = true;633 break;634 case INTEL_DP_AUX_BACKLIGHT_FORCE_VESA:635 try_vesa_interface = true;636 break;637 case INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL:638 try_intel_interface = true;639 break;640 }641 642 /*643 * Since Intel has their own backlight control interface, the majority of machines out there644 * using DPCD backlight controls with Intel GPUs will be using this interface as opposed to645 * the VESA interface. However, other GPUs (such as Nvidia's) will always use the VESA646 * interface. This means that there's quite a number of panels out there that will advertise647 * support for both interfaces, primarily systems with Intel/Nvidia hybrid GPU setups.648 *649 * There's a catch to this though: on many panels that advertise support for both650 * interfaces, the VESA backlight interface will stop working once we've programmed the651 * panel with Intel's OUI - which is also required for us to be able to detect Intel's652 * backlight interface at all. This means that the only sensible way for us to detect both653 * interfaces is to probe for Intel's first, and VESA's second.654 */655 if (try_intel_interface && intel_dp_aux_supports_hdr_backlight(connector)) {656 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using Intel proprietary eDP backlight controls\n",657 connector->base.base.id, connector->base.name);658 panel->backlight.funcs = &intel_dp_hdr_bl_funcs;659 return 0;660 }661 662 if (try_vesa_interface && intel_dp_aux_supports_vesa_backlight(connector)) {663 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using VESA eDP backlight controls\n",664 connector->base.base.id, connector->base.name);665 panel->backlight.funcs = &intel_dp_vesa_bl_funcs;666 return 0;667 }668 669 return -ENODEV;670}671