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
is_intel_tcon_cap(const u8 tcon_cap[4])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
intel_dp_aux_supports_hdr_backlight(struct intel_connector * connector)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
intel_dp_aux_hdr_get_backlight(struct intel_connector * connector,enum pipe pipe)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
intel_dp_aux_hdr_set_aux_backlight(const struct drm_connector_state * conn_state,u32 level)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 bool
intel_dp_in_hdr_mode(const struct drm_connector_state * conn_state)229 intel_dp_in_hdr_mode(const struct drm_connector_state *conn_state)
230 {
231 struct hdr_output_metadata *hdr_metadata;
232
233 if (!conn_state->hdr_output_metadata)
234 return false;
235
236 hdr_metadata = conn_state->hdr_output_metadata->data;
237
238 return hdr_metadata->hdmi_metadata_type1.eotf == HDMI_EOTF_SMPTE_ST2084;
239 }
240
241 static void
intel_dp_aux_hdr_set_backlight(const struct drm_connector_state * conn_state,u32 level)242 intel_dp_aux_hdr_set_backlight(const struct drm_connector_state *conn_state, u32 level)
243 {
244 struct intel_connector *connector = to_intel_connector(conn_state->connector);
245 struct intel_panel *panel = &connector->panel;
246
247 if (intel_dp_in_hdr_mode(conn_state) ||
248 panel->backlight.edp.intel_cap.sdr_uses_aux) {
249 intel_dp_aux_hdr_set_aux_backlight(conn_state, level);
250 } else {
251 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level);
252
253 intel_backlight_set_pwm_level(conn_state, pwm_level);
254 }
255 }
256
257 static void
intel_dp_aux_write_content_luminance(struct intel_connector * connector,struct hdr_output_metadata * hdr_metadata)258 intel_dp_aux_write_content_luminance(struct intel_connector *connector,
259 struct hdr_output_metadata *hdr_metadata)
260 {
261 struct intel_display *display = to_intel_display(connector);
262 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
263 int ret;
264 u8 buf[4];
265
266 if (!intel_dp_has_gamut_metadata_dip(connector->encoder))
267 return;
268
269 buf[0] = hdr_metadata->hdmi_metadata_type1.max_cll & 0xFF;
270 buf[1] = (hdr_metadata->hdmi_metadata_type1.max_cll & 0xFF00) >> 8;
271 buf[2] = hdr_metadata->hdmi_metadata_type1.max_fall & 0xFF;
272 buf[3] = (hdr_metadata->hdmi_metadata_type1.max_fall & 0xFF00) >> 8;
273
274 ret = drm_dp_dpcd_write(&intel_dp->aux,
275 INTEL_EDP_HDR_CONTENT_LUMINANCE,
276 buf, sizeof(buf));
277 if (ret < 0)
278 drm_dbg_kms(display->drm,
279 "Content Luminance DPCD reg write failed, err:-%d\n",
280 ret);
281 }
282
283 static void
intel_dp_aux_fill_hdr_tcon_params(const struct drm_connector_state * conn_state,u8 * ctrl)284 intel_dp_aux_fill_hdr_tcon_params(const struct drm_connector_state *conn_state, u8 *ctrl)
285 {
286 struct intel_connector *connector = to_intel_connector(conn_state->connector);
287 struct intel_panel *panel = &connector->panel;
288 struct intel_display *display = to_intel_display(connector);
289
290 /*
291 * According to spec segmented backlight needs to be set whenever panel is in
292 * HDR mode.
293 */
294 if (intel_dp_in_hdr_mode(conn_state)) {
295 *ctrl |= INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_ENABLE;
296 *ctrl |= INTEL_EDP_HDR_TCON_2084_DECODE_ENABLE;
297 }
298
299 if (DISPLAY_VER(display) < 11)
300 *ctrl &= ~INTEL_EDP_HDR_TCON_TONE_MAPPING_ENABLE;
301
302 if (panel->backlight.edp.intel_cap.supports_2020_gamut &&
303 (conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_RGB ||
304 conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_YCC ||
305 conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_CYCC))
306 *ctrl |= INTEL_EDP_HDR_TCON_2020_GAMUT_ENABLE;
307
308 if (panel->backlight.edp.intel_cap.supports_sdp_colorimetry &&
309 intel_dp_has_gamut_metadata_dip(connector->encoder))
310 *ctrl |= INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX;
311 else
312 *ctrl &= ~INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX;
313 }
314
315 static void
intel_dp_aux_hdr_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)316 intel_dp_aux_hdr_enable_backlight(const struct intel_crtc_state *crtc_state,
317 const struct drm_connector_state *conn_state, u32 level)
318 {
319 struct intel_display *display = to_intel_display(crtc_state);
320 struct intel_connector *connector = to_intel_connector(conn_state->connector);
321 struct intel_panel *panel = &connector->panel;
322 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
323 struct hdr_output_metadata *hdr_metadata;
324 int ret;
325 u8 old_ctrl, ctrl;
326
327 intel_dp_wait_source_oui(intel_dp);
328
329 ret = drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &old_ctrl);
330 if (ret != 1) {
331 drm_err(display->drm,
332 "[CONNECTOR:%d:%s] Failed to read current backlight control mode: %d\n",
333 connector->base.base.id, connector->base.name, ret);
334 return;
335 }
336
337 ctrl = old_ctrl;
338 if (intel_dp_in_hdr_mode(conn_state) ||
339 panel->backlight.edp.intel_cap.sdr_uses_aux) {
340 ctrl |= INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE;
341
342 intel_dp_aux_hdr_set_aux_backlight(conn_state, level);
343 } else {
344 u32 pwm_level = intel_backlight_level_to_pwm(connector, level);
345
346 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);
347
348 ctrl &= ~INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE;
349 }
350
351 intel_dp_aux_fill_hdr_tcon_params(conn_state, &ctrl);
352
353 if (ctrl != old_ctrl &&
354 drm_dp_dpcd_writeb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, ctrl) != 1)
355 drm_err(display->drm,
356 "[CONNECTOR:%d:%s] Failed to configure DPCD brightness controls\n",
357 connector->base.base.id, connector->base.name);
358
359 if (intel_dp_in_hdr_mode(conn_state)) {
360 hdr_metadata = conn_state->hdr_output_metadata->data;
361 intel_dp_aux_write_content_luminance(connector, hdr_metadata);
362 }
363 }
364
365 static void
intel_dp_aux_hdr_disable_backlight(const struct drm_connector_state * conn_state,u32 level)366 intel_dp_aux_hdr_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
367 {
368 struct intel_connector *connector = to_intel_connector(conn_state->connector);
369 struct intel_panel *panel = &connector->panel;
370
371 /* Nothing to do for AUX based backlight controls */
372 if (panel->backlight.edp.intel_cap.sdr_uses_aux)
373 return;
374
375 /* Note we want the actual pwm_level to be 0, regardless of pwm_min */
376 panel->backlight.pwm_funcs->disable(conn_state, intel_backlight_invert_pwm_level(connector, 0));
377 }
378
dpcd_vs_pwm_str(bool aux)379 static const char *dpcd_vs_pwm_str(bool aux)
380 {
381 return aux ? "DPCD" : "PWM";
382 }
383
384 static void
intel_dp_aux_write_panel_luminance_override(struct intel_connector * connector)385 intel_dp_aux_write_panel_luminance_override(struct intel_connector *connector)
386 {
387 struct intel_display *display = to_intel_display(connector);
388 struct intel_panel *panel = &connector->panel;
389 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
390 int ret;
391 u8 buf[4] = {};
392
393 buf[0] = panel->backlight.min & 0xFF;
394 buf[1] = (panel->backlight.min & 0xFF00) >> 8;
395 buf[2] = panel->backlight.max & 0xFF;
396 buf[3] = (panel->backlight.max & 0xFF00) >> 8;
397
398 ret = drm_dp_dpcd_write(&intel_dp->aux,
399 INTEL_EDP_HDR_PANEL_LUMINANCE_OVERRIDE,
400 buf, sizeof(buf));
401 if (ret < 0)
402 drm_dbg_kms(display->drm,
403 "Panel Luminance DPCD reg write failed, err:-%d\n",
404 ret);
405 }
406
407 static int
intel_dp_aux_hdr_setup_backlight(struct intel_connector * connector,enum pipe pipe)408 intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pipe)
409 {
410 struct intel_display *display = to_intel_display(connector);
411 struct intel_panel *panel = &connector->panel;
412 struct drm_luminance_range_info *luminance_range =
413 &connector->base.display_info.luminance_range;
414 int ret;
415
416 drm_dbg_kms(display->drm,
417 "[CONNECTOR:%d:%s] SDR backlight is controlled through %s\n",
418 connector->base.base.id, connector->base.name,
419 dpcd_vs_pwm_str(panel->backlight.edp.intel_cap.sdr_uses_aux));
420
421 if (!panel->backlight.edp.intel_cap.sdr_uses_aux) {
422 ret = panel->backlight.pwm_funcs->setup(connector, pipe);
423 if (ret < 0) {
424 drm_err(display->drm,
425 "[CONNECTOR:%d:%s] Failed to setup SDR backlight controls through PWM: %d\n",
426 connector->base.base.id, connector->base.name, ret);
427 return ret;
428 }
429 }
430
431 if (luminance_range->max_luminance) {
432 panel->backlight.max = luminance_range->max_luminance;
433 panel->backlight.min = luminance_range->min_luminance;
434 } else {
435 panel->backlight.max = 512;
436 panel->backlight.min = 0;
437 }
438
439 intel_dp_aux_write_panel_luminance_override(connector);
440
441 drm_dbg_kms(display->drm,
442 "[CONNECTOR:%d:%s] Using AUX HDR interface for backlight control (range %d..%d)\n",
443 connector->base.base.id, connector->base.name,
444 panel->backlight.min, panel->backlight.max);
445
446 panel->backlight.level = intel_dp_aux_hdr_get_backlight(connector, pipe);
447 panel->backlight.enabled = panel->backlight.level != 0;
448
449 return 0;
450 }
451
452 /* VESA backlight callbacks */
intel_dp_aux_vesa_get_backlight(struct intel_connector * connector,enum pipe unused)453 static u32 intel_dp_aux_vesa_get_backlight(struct intel_connector *connector, enum pipe unused)
454 {
455 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
456 struct intel_panel *panel = &connector->panel;
457 u8 buf[3];
458 u32 val = 0;
459 int ret;
460
461 if (panel->backlight.edp.vesa.luminance_control_support) {
462 ret = drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE, buf,
463 sizeof(buf));
464 if (ret < 0) {
465 drm_err(intel_dp->aux.drm_dev,
466 "[CONNECTOR:%d:%s] Failed to read Luminance from DPCD\n",
467 connector->base.base.id, connector->base.name);
468 return 0;
469 }
470
471 val |= buf[0] | buf[1] << 8 | buf[2] << 16;
472 return val / 1000;
473 }
474
475 return connector->panel.backlight.level;
476 }
477
478 static void
intel_dp_aux_vesa_set_backlight(const struct drm_connector_state * conn_state,u32 level)479 intel_dp_aux_vesa_set_backlight(const struct drm_connector_state *conn_state, u32 level)
480 {
481 struct intel_connector *connector = to_intel_connector(conn_state->connector);
482 struct intel_panel *panel = &connector->panel;
483 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
484
485 if (!panel->backlight.edp.vesa.info.aux_set) {
486 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level);
487
488 intel_backlight_set_pwm_level(conn_state, pwm_level);
489 }
490
491 drm_edp_backlight_set_level(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);
492 }
493
494 static void
intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)495 intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state,
496 const struct drm_connector_state *conn_state, u32 level)
497 {
498 struct intel_connector *connector = to_intel_connector(conn_state->connector);
499 struct intel_panel *panel = &connector->panel;
500 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
501
502 if (!panel->backlight.edp.vesa.info.aux_enable) {
503 u32 pwm_level;
504
505 if (!panel->backlight.edp.vesa.info.aux_set)
506 pwm_level = intel_backlight_level_to_pwm(connector, level);
507 else
508 pwm_level = intel_backlight_invert_pwm_level(connector,
509 panel->backlight.pwm_level_max);
510
511 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);
512 }
513
514 drm_edp_backlight_enable(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);
515 }
516
intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state * old_conn_state,u32 level)517 static void intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state *old_conn_state,
518 u32 level)
519 {
520 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
521 struct intel_panel *panel = &connector->panel;
522 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
523
524 if (panel->backlight.edp.vesa.luminance_control_support)
525 return;
526
527 drm_edp_backlight_disable(&intel_dp->aux, &panel->backlight.edp.vesa.info);
528
529 if (!panel->backlight.edp.vesa.info.aux_enable)
530 panel->backlight.pwm_funcs->disable(old_conn_state,
531 intel_backlight_invert_pwm_level(connector, 0));
532 }
533
intel_dp_aux_vesa_setup_backlight(struct intel_connector * connector,enum pipe pipe)534 static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector, enum pipe pipe)
535 {
536 struct intel_display *display = to_intel_display(connector);
537 struct drm_luminance_range_info *luminance_range =
538 &connector->base.display_info.luminance_range;
539 struct intel_dp *intel_dp = intel_attached_dp(connector);
540 struct intel_panel *panel = &connector->panel;
541 u32 current_level;
542 u8 current_mode;
543 int ret;
544
545 ret = drm_edp_backlight_init(&intel_dp->aux, &panel->backlight.edp.vesa.info,
546 luminance_range->max_luminance,
547 panel->vbt.backlight.pwm_freq_hz,
548 intel_dp->edp_dpcd, ¤t_level, ¤t_mode,
549 false);
550 if (ret < 0)
551 return ret;
552
553 drm_dbg_kms(display->drm,
554 "[CONNECTOR:%d:%s] AUX VESA backlight enable is controlled through %s\n",
555 connector->base.base.id, connector->base.name,
556 dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_enable));
557 drm_dbg_kms(display->drm,
558 "[CONNECTOR:%d:%s] AUX VESA backlight level is controlled through %s\n",
559 connector->base.base.id, connector->base.name,
560 dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_set));
561
562 if (!panel->backlight.edp.vesa.info.aux_set ||
563 !panel->backlight.edp.vesa.info.aux_enable) {
564 ret = panel->backlight.pwm_funcs->setup(connector, pipe);
565 if (ret < 0) {
566 drm_err(display->drm,
567 "[CONNECTOR:%d:%s] Failed to setup PWM backlight controls for eDP backlight: %d\n",
568 connector->base.base.id, connector->base.name, ret);
569 return ret;
570 }
571 }
572
573 if (panel->backlight.edp.vesa.info.luminance_set) {
574 if (luminance_range->max_luminance) {
575 panel->backlight.max = panel->backlight.edp.vesa.info.max;
576 panel->backlight.min = luminance_range->min_luminance;
577 } else {
578 panel->backlight.max = 512;
579 panel->backlight.min = 0;
580 }
581 panel->backlight.level = intel_dp_aux_vesa_get_backlight(connector, 0);
582 panel->backlight.enabled = panel->backlight.level != 0;
583 drm_dbg_kms(display->drm,
584 "[CONNECTOR:%d:%s] AUX VESA Nits backlight level is controlled through DPCD\n",
585 connector->base.base.id, connector->base.name);
586 } else if (panel->backlight.edp.vesa.info.aux_set) {
587 panel->backlight.max = panel->backlight.edp.vesa.info.max;
588 panel->backlight.min = 0;
589 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
590 panel->backlight.level = current_level;
591 panel->backlight.enabled = panel->backlight.level != 0;
592 } else {
593 panel->backlight.level = panel->backlight.max;
594 panel->backlight.enabled = false;
595 }
596 } else {
597 panel->backlight.max = panel->backlight.pwm_level_max;
598 panel->backlight.min = panel->backlight.pwm_level_min;
599 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_PWM) {
600 panel->backlight.level =
601 panel->backlight.pwm_funcs->get(connector, pipe);
602 panel->backlight.enabled = panel->backlight.pwm_enabled;
603 } else {
604 panel->backlight.level = panel->backlight.max;
605 panel->backlight.enabled = false;
606 }
607 }
608
609 drm_dbg_kms(display->drm,
610 "[CONNECTOR:%d:%s] Using AUX VESA interface for backlight control\n",
611 connector->base.base.id, connector->base.name);
612
613 return 0;
614 }
615
616 static bool
intel_dp_aux_supports_vesa_backlight(struct intel_connector * connector)617 intel_dp_aux_supports_vesa_backlight(struct intel_connector *connector)
618 {
619 struct intel_display *display = to_intel_display(connector);
620 struct intel_dp *intel_dp = intel_attached_dp(connector);
621 struct intel_panel *panel = &connector->panel;
622
623 if ((intel_dp->edp_dpcd[3] & DP_EDP_PANEL_LUMINANCE_CONTROL_CAPABLE) &&
624 (intel_dp->edp_dpcd[3] & DP_EDP_SMOOTH_BRIGHTNESS_CAPABLE)) {
625 drm_dbg_kms(display->drm,
626 "[CONNECTOR:%d:%s] AUX Luminance Based Backlight Control Supported!\n",
627 connector->base.base.id, connector->base.name);
628 panel->backlight.edp.vesa.luminance_control_support = true;
629 return true;
630 }
631
632 if (drm_edp_backlight_supported(intel_dp->edp_dpcd)) {
633 drm_dbg_kms(display->drm,
634 "[CONNECTOR:%d:%s] AUX Backlight Control Supported!\n",
635 connector->base.base.id, connector->base.name);
636 return true;
637 }
638 return false;
639 }
640
641 static const struct intel_panel_bl_funcs intel_dp_hdr_bl_funcs = {
642 .setup = intel_dp_aux_hdr_setup_backlight,
643 .enable = intel_dp_aux_hdr_enable_backlight,
644 .disable = intel_dp_aux_hdr_disable_backlight,
645 .set = intel_dp_aux_hdr_set_backlight,
646 .get = intel_dp_aux_hdr_get_backlight,
647 };
648
649 static const struct intel_panel_bl_funcs intel_dp_vesa_bl_funcs = {
650 .setup = intel_dp_aux_vesa_setup_backlight,
651 .enable = intel_dp_aux_vesa_enable_backlight,
652 .disable = intel_dp_aux_vesa_disable_backlight,
653 .set = intel_dp_aux_vesa_set_backlight,
654 .get = intel_dp_aux_vesa_get_backlight,
655 };
656
intel_dp_aux_init_backlight_funcs(struct intel_connector * connector)657 int intel_dp_aux_init_backlight_funcs(struct intel_connector *connector)
658 {
659 struct intel_display *display = to_intel_display(connector);
660 struct intel_dp *intel_dp = intel_attached_dp(connector);
661 struct drm_device *dev = connector->base.dev;
662 struct intel_panel *panel = &connector->panel;
663 bool try_intel_interface = false, try_vesa_interface = false;
664
665 /* Check the VBT and user's module parameters to figure out which
666 * interfaces to probe
667 */
668 switch (display->params.enable_dpcd_backlight) {
669 case INTEL_DP_AUX_BACKLIGHT_OFF:
670 return -ENODEV;
671 case INTEL_DP_AUX_BACKLIGHT_AUTO:
672 switch (panel->vbt.backlight.type) {
673 case INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE:
674 try_vesa_interface = true;
675 break;
676 case INTEL_BACKLIGHT_DISPLAY_DDI:
677 try_intel_interface = true;
678 break;
679 default:
680 return -ENODEV;
681 }
682 break;
683 case INTEL_DP_AUX_BACKLIGHT_ON:
684 if (panel->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE)
685 try_intel_interface = true;
686
687 try_vesa_interface = true;
688 break;
689 case INTEL_DP_AUX_BACKLIGHT_FORCE_VESA:
690 try_vesa_interface = true;
691 break;
692 case INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL:
693 try_intel_interface = true;
694 break;
695 }
696
697 /* For eDP 1.5 and above we are supposed to use VESA interface for brightness control */
698 if (intel_dp->edp_dpcd[0] >= DP_EDP_15)
699 try_vesa_interface = true;
700
701 /*
702 * Since Intel has their own backlight control interface, the majority of machines out there
703 * using DPCD backlight controls with Intel GPUs will be using this interface as opposed to
704 * the VESA interface. However, other GPUs (such as Nvidia's) will always use the VESA
705 * interface. This means that there's quite a number of panels out there that will advertise
706 * support for both interfaces, primarily systems with Intel/Nvidia hybrid GPU setups.
707 *
708 * There's a catch to this though: on many panels that advertise support for both
709 * interfaces, the VESA backlight interface will stop working once we've programmed the
710 * panel with Intel's OUI - which is also required for us to be able to detect Intel's
711 * backlight interface at all. This means that the only sensible way for us to detect both
712 * interfaces is to probe for Intel's first, and VESA's second.
713 */
714 if (try_intel_interface && intel_dp_aux_supports_hdr_backlight(connector) &&
715 intel_dp->edp_dpcd[0] <= DP_EDP_14b) {
716 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using Intel proprietary eDP backlight controls\n",
717 connector->base.base.id, connector->base.name);
718 panel->backlight.funcs = &intel_dp_hdr_bl_funcs;
719 return 0;
720 }
721
722 if (try_vesa_interface && intel_dp_aux_supports_vesa_backlight(connector)) {
723 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using VESA eDP backlight controls\n",
724 connector->base.base.id, connector->base.name);
725 panel->backlight.funcs = &intel_dp_vesa_bl_funcs;
726 return 0;
727 }
728
729 return -ENODEV;
730 }
731