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 "i915_utils.h"
40 #include "intel_backlight.h"
41 #include "intel_display_core.h"
42 #include "intel_display_types.h"
43 #include "intel_dp.h"
44 #include "intel_dp_aux_backlight.h"
45
46 /*
47 * DP AUX registers for Intel's proprietary HDR backlight interface. We define
48 * them here since we'll likely be the only driver to ever use these.
49 */
50 #define INTEL_EDP_HDR_TCON_CAP0 0x340
51
52 #define INTEL_EDP_HDR_TCON_CAP1 0x341
53 # define INTEL_EDP_HDR_TCON_2084_DECODE_CAP BIT(0)
54 # define INTEL_EDP_HDR_TCON_2020_GAMUT_CAP BIT(1)
55 # define INTEL_EDP_HDR_TCON_TONE_MAPPING_CAP BIT(2)
56 # define INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_CAP BIT(3)
57 # define INTEL_EDP_HDR_TCON_BRIGHTNESS_NITS_CAP BIT(4)
58 # define INTEL_EDP_HDR_TCON_OPTIMIZATION_CAP BIT(5)
59 # define INTEL_EDP_HDR_TCON_SDP_COLORIMETRY_CAP BIT(6)
60 # define INTEL_EDP_HDR_TCON_SRGB_TO_PANEL_GAMUT_CONVERSION_CAP BIT(7)
61
62 #define INTEL_EDP_HDR_TCON_CAP2 0x342
63 # define INTEL_EDP_SDR_TCON_BRIGHTNESS_AUX_CAP BIT(0)
64
65 #define INTEL_EDP_HDR_TCON_CAP3 0x343
66
67 #define INTEL_EDP_HDR_GETSET_CTRL_PARAMS 0x344
68 # define INTEL_EDP_HDR_TCON_2084_DECODE_ENABLE BIT(0)
69 # define INTEL_EDP_HDR_TCON_2020_GAMUT_ENABLE BIT(1)
70 # define INTEL_EDP_HDR_TCON_TONE_MAPPING_ENABLE BIT(2)
71 # define INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_ENABLE BIT(3)
72 # define INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE BIT(4)
73 # define INTEL_EDP_HDR_TCON_SRGB_TO_PANEL_GAMUT_ENABLE BIT(5)
74 /* Bit 6 is reserved */
75 # define INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX BIT(7)
76
77 #define INTEL_EDP_HDR_CONTENT_LUMINANCE 0x346
78 #define INTEL_EDP_HDR_PANEL_LUMINANCE_OVERRIDE 0x34A
79 #define INTEL_EDP_SDR_LUMINANCE_LEVEL 0x352
80 #define INTEL_EDP_BRIGHTNESS_NITS_LSB 0x354
81 #define INTEL_EDP_BRIGHTNESS_NITS_MSB 0x355
82 #define INTEL_EDP_BRIGHTNESS_DELAY_FRAMES 0x356
83 #define INTEL_EDP_BRIGHTNESS_PER_FRAME_STEPS 0x357
84
85 #define INTEL_EDP_BRIGHTNESS_OPTIMIZATION_0 0x358
86 # define INTEL_EDP_TCON_USAGE_MASK GENMASK(0, 3)
87 # define INTEL_EDP_TCON_USAGE_UNKNOWN 0x0
88 # define INTEL_EDP_TCON_USAGE_DESKTOP 0x1
89 # define INTEL_EDP_TCON_USAGE_FULL_SCREEN_MEDIA 0x2
90 # define INTEL_EDP_TCON_USAGE_FULL_SCREEN_GAMING 0x3
91 # define INTEL_EDP_TCON_POWER_MASK BIT(4)
92 # define INTEL_EDP_TCON_POWER_DC (0 << 4)
93 # define INTEL_EDP_TCON_POWER_AC (1 << 4)
94 # define INTEL_EDP_TCON_OPTIMIZATION_STRENGTH_MASK GENMASK(5, 7)
95
96 #define INTEL_EDP_BRIGHTNESS_OPTIMIZATION_1 0x359
97
98 enum intel_dp_aux_backlight_modparam {
99 INTEL_DP_AUX_BACKLIGHT_AUTO = -1,
100 INTEL_DP_AUX_BACKLIGHT_OFF = 0,
101 INTEL_DP_AUX_BACKLIGHT_ON = 1,
102 INTEL_DP_AUX_BACKLIGHT_FORCE_VESA = 2,
103 INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL = 3,
104 };
105
is_intel_tcon_cap(const u8 tcon_cap[4])106 static bool is_intel_tcon_cap(const u8 tcon_cap[4])
107 {
108 return tcon_cap[0] >= 1;
109 }
110
111 /* Intel EDP backlight callbacks */
112 static bool
intel_dp_aux_supports_hdr_backlight(struct intel_connector * connector)113 intel_dp_aux_supports_hdr_backlight(struct intel_connector *connector)
114 {
115 struct intel_display *display = to_intel_display(connector);
116 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
117 struct drm_dp_aux *aux = &intel_dp->aux;
118 struct intel_panel *panel = &connector->panel;
119 int ret;
120 u8 tcon_cap[4];
121
122 intel_dp_wait_source_oui(intel_dp);
123
124 ret = drm_dp_dpcd_read(aux, INTEL_EDP_HDR_TCON_CAP0, tcon_cap, sizeof(tcon_cap));
125 if (ret != sizeof(tcon_cap))
126 return false;
127
128 drm_dbg_kms(display->drm,
129 "[CONNECTOR:%d:%s] Detected %s HDR backlight interface version %d\n",
130 connector->base.base.id, connector->base.name,
131 is_intel_tcon_cap(tcon_cap) ? "Intel" : "unsupported", tcon_cap[0]);
132
133 if (!is_intel_tcon_cap(tcon_cap))
134 return false;
135
136 if (!(tcon_cap[1] & INTEL_EDP_HDR_TCON_BRIGHTNESS_NITS_CAP))
137 return false;
138
139 /*
140 * If we don't have HDR static metadata there is no way to
141 * runtime detect used range for nits based control. For now
142 * do not use Intel proprietary eDP backlight control if we
143 * don't have this data in panel EDID. In case we find panel
144 * which supports only nits based control, but doesn't provide
145 * HDR static metadata we need to start maintaining table of
146 * ranges for such panels.
147 */
148 if (display->params.enable_dpcd_backlight != INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL &&
149 !(connector->base.hdr_sink_metadata.hdmi_type1.metadata_type &
150 BIT(HDMI_STATIC_METADATA_TYPE1))) {
151 drm_info(display->drm,
152 "[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",
153 connector->base.base.id, connector->base.name,
154 INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL);
155 return false;
156 }
157
158 panel->backlight.edp.intel_cap.sdr_uses_aux =
159 tcon_cap[2] & INTEL_EDP_SDR_TCON_BRIGHTNESS_AUX_CAP;
160 panel->backlight.edp.intel_cap.supports_2084_decode =
161 tcon_cap[1] & INTEL_EDP_HDR_TCON_2084_DECODE_CAP;
162 panel->backlight.edp.intel_cap.supports_2020_gamut =
163 tcon_cap[1] & INTEL_EDP_HDR_TCON_2020_GAMUT_CAP;
164 panel->backlight.edp.intel_cap.supports_segmented_backlight =
165 tcon_cap[1] & INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_CAP;
166 panel->backlight.edp.intel_cap.supports_sdp_colorimetry =
167 tcon_cap[1] & INTEL_EDP_HDR_TCON_SDP_COLORIMETRY_CAP;
168 panel->backlight.edp.intel_cap.supports_tone_mapping =
169 tcon_cap[1] & INTEL_EDP_HDR_TCON_TONE_MAPPING_CAP;
170
171 return true;
172 }
173
174 static u32
intel_dp_aux_hdr_get_backlight(struct intel_connector * connector,enum pipe pipe)175 intel_dp_aux_hdr_get_backlight(struct intel_connector *connector, enum pipe pipe)
176 {
177 struct intel_display *display = to_intel_display(connector);
178 struct intel_panel *panel = &connector->panel;
179 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
180 u8 tmp;
181 u8 buf[2] = {};
182
183 if (drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &tmp) != 1) {
184 drm_err(display->drm,
185 "[CONNECTOR:%d:%s] Failed to read current backlight mode from DPCD\n",
186 connector->base.base.id, connector->base.name);
187 return 0;
188 }
189
190 if (!(tmp & INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE)) {
191 if (!panel->backlight.edp.intel_cap.sdr_uses_aux) {
192 u32 pwm_level = panel->backlight.pwm_funcs->get(connector, pipe);
193
194 return intel_backlight_level_from_pwm(connector, pwm_level);
195 }
196
197 /* Assume 100% brightness if backlight controls aren't enabled yet */
198 return panel->backlight.max;
199 }
200
201 if (drm_dp_dpcd_read(&intel_dp->aux, INTEL_EDP_BRIGHTNESS_NITS_LSB, buf,
202 sizeof(buf)) != sizeof(buf)) {
203 drm_err(display->drm,
204 "[CONNECTOR:%d:%s] Failed to read brightness from DPCD\n",
205 connector->base.base.id, connector->base.name);
206 return 0;
207 }
208
209 return (buf[1] << 8 | buf[0]);
210 }
211
212 static void
intel_dp_aux_hdr_set_aux_backlight(const struct drm_connector_state * conn_state,u32 level)213 intel_dp_aux_hdr_set_aux_backlight(const struct drm_connector_state *conn_state, u32 level)
214 {
215 struct intel_connector *connector = to_intel_connector(conn_state->connector);
216 struct drm_device *dev = connector->base.dev;
217 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
218 u8 buf[4] = {};
219
220 buf[0] = level & 0xFF;
221 buf[1] = (level & 0xFF00) >> 8;
222
223 if (drm_dp_dpcd_write(&intel_dp->aux, INTEL_EDP_BRIGHTNESS_NITS_LSB, buf,
224 sizeof(buf)) != sizeof(buf))
225 drm_err(dev, "[CONNECTOR:%d:%s] Failed to write brightness level to DPCD\n",
226 connector->base.base.id, connector->base.name);
227 }
228
229 static bool
intel_dp_in_hdr_mode(const struct drm_connector_state * conn_state)230 intel_dp_in_hdr_mode(const struct drm_connector_state *conn_state)
231 {
232 struct hdr_output_metadata *hdr_metadata;
233
234 if (!conn_state->hdr_output_metadata)
235 return false;
236
237 hdr_metadata = conn_state->hdr_output_metadata->data;
238
239 return hdr_metadata->hdmi_metadata_type1.eotf == HDMI_EOTF_SMPTE_ST2084;
240 }
241
242 static void
intel_dp_aux_hdr_set_backlight(const struct drm_connector_state * conn_state,u32 level)243 intel_dp_aux_hdr_set_backlight(const struct drm_connector_state *conn_state, u32 level)
244 {
245 struct intel_connector *connector = to_intel_connector(conn_state->connector);
246 struct intel_panel *panel = &connector->panel;
247
248 if (intel_dp_in_hdr_mode(conn_state) ||
249 panel->backlight.edp.intel_cap.sdr_uses_aux) {
250 intel_dp_aux_hdr_set_aux_backlight(conn_state, level);
251 } else {
252 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level);
253
254 intel_backlight_set_pwm_level(conn_state, pwm_level);
255 }
256 }
257
258 static void
intel_dp_aux_write_content_luminance(struct intel_connector * connector,struct hdr_output_metadata * hdr_metadata)259 intel_dp_aux_write_content_luminance(struct intel_connector *connector,
260 struct hdr_output_metadata *hdr_metadata)
261 {
262 struct intel_display *display = to_intel_display(connector);
263 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
264 int ret;
265 u8 buf[4];
266
267 if (!intel_dp_has_gamut_metadata_dip(connector->encoder))
268 return;
269
270 buf[0] = hdr_metadata->hdmi_metadata_type1.max_cll & 0xFF;
271 buf[1] = (hdr_metadata->hdmi_metadata_type1.max_cll & 0xFF00) >> 8;
272 buf[2] = hdr_metadata->hdmi_metadata_type1.max_fall & 0xFF;
273 buf[3] = (hdr_metadata->hdmi_metadata_type1.max_fall & 0xFF00) >> 8;
274
275 ret = drm_dp_dpcd_write(&intel_dp->aux,
276 INTEL_EDP_HDR_CONTENT_LUMINANCE,
277 buf, sizeof(buf));
278 if (ret < 0)
279 drm_dbg_kms(display->drm,
280 "Content Luminance DPCD reg write failed, err:-%d\n",
281 ret);
282 }
283
284 static void
intel_dp_aux_fill_hdr_tcon_params(const struct drm_connector_state * conn_state,u8 * ctrl)285 intel_dp_aux_fill_hdr_tcon_params(const struct drm_connector_state *conn_state, u8 *ctrl)
286 {
287 struct intel_connector *connector = to_intel_connector(conn_state->connector);
288 struct intel_panel *panel = &connector->panel;
289 struct intel_display *display = to_intel_display(connector);
290
291 /*
292 * According to spec segmented backlight needs to be set whenever panel is in
293 * HDR mode.
294 */
295 if (intel_dp_in_hdr_mode(conn_state)) {
296 *ctrl |= INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_ENABLE;
297 *ctrl |= INTEL_EDP_HDR_TCON_2084_DECODE_ENABLE;
298 }
299
300 if (DISPLAY_VER(display) < 11)
301 *ctrl &= ~INTEL_EDP_HDR_TCON_TONE_MAPPING_ENABLE;
302
303 if (panel->backlight.edp.intel_cap.supports_2020_gamut &&
304 (conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_RGB ||
305 conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_YCC ||
306 conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_CYCC))
307 *ctrl |= INTEL_EDP_HDR_TCON_2020_GAMUT_ENABLE;
308
309 if (panel->backlight.edp.intel_cap.supports_sdp_colorimetry &&
310 intel_dp_has_gamut_metadata_dip(connector->encoder))
311 *ctrl |= INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX;
312 else
313 *ctrl &= ~INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX;
314 }
315
316 static void
intel_dp_aux_hdr_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)317 intel_dp_aux_hdr_enable_backlight(const struct intel_crtc_state *crtc_state,
318 const struct drm_connector_state *conn_state, u32 level)
319 {
320 struct intel_display *display = to_intel_display(crtc_state);
321 struct intel_connector *connector = to_intel_connector(conn_state->connector);
322 struct intel_panel *panel = &connector->panel;
323 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
324 struct hdr_output_metadata *hdr_metadata;
325 int ret;
326 u8 old_ctrl, ctrl;
327
328 intel_dp_wait_source_oui(intel_dp);
329
330 ret = drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &old_ctrl);
331 if (ret != 1) {
332 drm_err(display->drm,
333 "[CONNECTOR:%d:%s] Failed to read current backlight control mode: %d\n",
334 connector->base.base.id, connector->base.name, ret);
335 return;
336 }
337
338 ctrl = old_ctrl;
339 if (intel_dp_in_hdr_mode(conn_state) ||
340 panel->backlight.edp.intel_cap.sdr_uses_aux) {
341 ctrl |= INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE;
342
343 intel_dp_aux_hdr_set_aux_backlight(conn_state, level);
344 } else {
345 u32 pwm_level = intel_backlight_level_to_pwm(connector, level);
346
347 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);
348
349 ctrl &= ~INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE;
350 }
351
352 intel_dp_aux_fill_hdr_tcon_params(conn_state, &ctrl);
353
354 if (ctrl != old_ctrl &&
355 drm_dp_dpcd_writeb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, ctrl) != 1)
356 drm_err(display->drm,
357 "[CONNECTOR:%d:%s] Failed to configure DPCD brightness controls\n",
358 connector->base.base.id, connector->base.name);
359
360 if (intel_dp_in_hdr_mode(conn_state)) {
361 hdr_metadata = conn_state->hdr_output_metadata->data;
362 intel_dp_aux_write_content_luminance(connector, hdr_metadata);
363 }
364 }
365
366 static void
intel_dp_aux_hdr_disable_backlight(const struct drm_connector_state * conn_state,u32 level)367 intel_dp_aux_hdr_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
368 {
369 struct intel_connector *connector = to_intel_connector(conn_state->connector);
370 struct intel_panel *panel = &connector->panel;
371
372 /* Nothing to do for AUX based backlight controls */
373 if (panel->backlight.edp.intel_cap.sdr_uses_aux)
374 return;
375
376 /* Note we want the actual pwm_level to be 0, regardless of pwm_min */
377 panel->backlight.pwm_funcs->disable(conn_state, intel_backlight_invert_pwm_level(connector, 0));
378 }
379
dpcd_vs_pwm_str(bool aux)380 static const char *dpcd_vs_pwm_str(bool aux)
381 {
382 return aux ? "DPCD" : "PWM";
383 }
384
385 static void
intel_dp_aux_write_panel_luminance_override(struct intel_connector * connector)386 intel_dp_aux_write_panel_luminance_override(struct intel_connector *connector)
387 {
388 struct intel_display *display = to_intel_display(connector);
389 struct intel_panel *panel = &connector->panel;
390 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
391 int ret;
392 u8 buf[4] = {};
393
394 buf[0] = panel->backlight.min & 0xFF;
395 buf[1] = (panel->backlight.min & 0xFF00) >> 8;
396 buf[2] = panel->backlight.max & 0xFF;
397 buf[3] = (panel->backlight.max & 0xFF00) >> 8;
398
399 ret = drm_dp_dpcd_write(&intel_dp->aux,
400 INTEL_EDP_HDR_PANEL_LUMINANCE_OVERRIDE,
401 buf, sizeof(buf));
402 if (ret < 0)
403 drm_dbg_kms(display->drm,
404 "Panel Luminance DPCD reg write failed, err:-%d\n",
405 ret);
406 }
407
408 static int
intel_dp_aux_hdr_setup_backlight(struct intel_connector * connector,enum pipe pipe)409 intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pipe)
410 {
411 struct intel_display *display = to_intel_display(connector);
412 struct intel_panel *panel = &connector->panel;
413 struct drm_luminance_range_info *luminance_range =
414 &connector->base.display_info.luminance_range;
415 int ret;
416
417 drm_dbg_kms(display->drm,
418 "[CONNECTOR:%d:%s] SDR backlight is controlled through %s\n",
419 connector->base.base.id, connector->base.name,
420 dpcd_vs_pwm_str(panel->backlight.edp.intel_cap.sdr_uses_aux));
421
422 if (!panel->backlight.edp.intel_cap.sdr_uses_aux) {
423 ret = panel->backlight.pwm_funcs->setup(connector, pipe);
424 if (ret < 0) {
425 drm_err(display->drm,
426 "[CONNECTOR:%d:%s] Failed to setup SDR backlight controls through PWM: %d\n",
427 connector->base.base.id, connector->base.name, ret);
428 return ret;
429 }
430 }
431
432 if (luminance_range->max_luminance) {
433 panel->backlight.max = luminance_range->max_luminance;
434 panel->backlight.min = luminance_range->min_luminance;
435 } else {
436 panel->backlight.max = 512;
437 panel->backlight.min = 0;
438 }
439
440 intel_dp_aux_write_panel_luminance_override(connector);
441
442 drm_dbg_kms(display->drm,
443 "[CONNECTOR:%d:%s] Using AUX HDR interface for backlight control (range %d..%d)\n",
444 connector->base.base.id, connector->base.name,
445 panel->backlight.min, panel->backlight.max);
446
447 panel->backlight.level = intel_dp_aux_hdr_get_backlight(connector, pipe);
448 panel->backlight.enabled = panel->backlight.level != 0;
449
450 return 0;
451 }
452
453 /* VESA backlight callbacks */
intel_dp_aux_vesa_get_backlight(struct intel_connector * connector,enum pipe unused)454 static u32 intel_dp_aux_vesa_get_backlight(struct intel_connector *connector, enum pipe unused)
455 {
456 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
457 struct intel_panel *panel = &connector->panel;
458 u8 buf[3];
459 u32 val = 0;
460 int ret;
461
462 if (panel->backlight.edp.vesa.luminance_control_support) {
463 ret = drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE, buf,
464 sizeof(buf));
465 if (ret < 0) {
466 drm_err(intel_dp->aux.drm_dev,
467 "[CONNECTOR:%d:%s] Failed to read Luminance from DPCD\n",
468 connector->base.base.id, connector->base.name);
469 return 0;
470 }
471
472 val |= buf[0] | buf[1] << 8 | buf[2] << 16;
473 return val / 1000;
474 }
475
476 return connector->panel.backlight.level;
477 }
478
479 static int
intel_dp_aux_vesa_set_luminance(struct intel_connector * connector,u32 level)480 intel_dp_aux_vesa_set_luminance(struct intel_connector *connector, u32 level)
481 {
482 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
483 u8 buf[3];
484 int ret;
485
486 level = level * 1000;
487 level &= 0xffffff;
488 buf[0] = (level & 0x0000ff);
489 buf[1] = (level & 0x00ff00) >> 8;
490 buf[2] = (level & 0xff0000) >> 16;
491
492 ret = drm_dp_dpcd_write(&intel_dp->aux, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE,
493 buf, sizeof(buf));
494 if (ret != sizeof(buf)) {
495 drm_err(intel_dp->aux.drm_dev,
496 "%s: Failed to set VESA Aux Luminance: %d\n",
497 intel_dp->aux.name, ret);
498 return -EINVAL;
499 } else {
500 return 0;
501 }
502 }
503
504 static void
intel_dp_aux_vesa_set_backlight(const struct drm_connector_state * conn_state,u32 level)505 intel_dp_aux_vesa_set_backlight(const struct drm_connector_state *conn_state, u32 level)
506 {
507 struct intel_connector *connector = to_intel_connector(conn_state->connector);
508 struct intel_panel *panel = &connector->panel;
509 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
510
511 if (panel->backlight.edp.vesa.luminance_control_support) {
512 if (!intel_dp_aux_vesa_set_luminance(connector, level))
513 return;
514 }
515
516 if (!panel->backlight.edp.vesa.info.aux_set) {
517 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level);
518
519 intel_backlight_set_pwm_level(conn_state, pwm_level);
520 }
521
522 drm_edp_backlight_set_level(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);
523 }
524
525 static void
intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)526 intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state,
527 const struct drm_connector_state *conn_state, u32 level)
528 {
529 struct intel_connector *connector = to_intel_connector(conn_state->connector);
530 struct intel_panel *panel = &connector->panel;
531 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
532 int ret;
533
534 if (panel->backlight.edp.vesa.luminance_control_support) {
535 ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER,
536 DP_EDP_PANEL_LUMINANCE_CONTROL_ENABLE);
537
538 if (ret == 1)
539 return;
540
541 if (!intel_dp_aux_vesa_set_luminance(connector, level))
542 return;
543 }
544
545 if (!panel->backlight.edp.vesa.info.aux_enable) {
546 u32 pwm_level;
547
548 if (!panel->backlight.edp.vesa.info.aux_set)
549 pwm_level = intel_backlight_level_to_pwm(connector, level);
550 else
551 pwm_level = intel_backlight_invert_pwm_level(connector,
552 panel->backlight.pwm_level_max);
553
554 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);
555 }
556
557 drm_edp_backlight_enable(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);
558 }
559
intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state * old_conn_state,u32 level)560 static void intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state *old_conn_state,
561 u32 level)
562 {
563 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
564 struct intel_panel *panel = &connector->panel;
565 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
566
567 if (panel->backlight.edp.vesa.luminance_control_support)
568 return;
569
570 drm_edp_backlight_disable(&intel_dp->aux, &panel->backlight.edp.vesa.info);
571
572 if (!panel->backlight.edp.vesa.info.aux_enable)
573 panel->backlight.pwm_funcs->disable(old_conn_state,
574 intel_backlight_invert_pwm_level(connector, 0));
575 }
576
intel_dp_aux_vesa_setup_backlight(struct intel_connector * connector,enum pipe pipe)577 static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector, enum pipe pipe)
578 {
579 struct intel_display *display = to_intel_display(connector);
580 struct drm_luminance_range_info *luminance_range =
581 &connector->base.display_info.luminance_range;
582 struct intel_dp *intel_dp = intel_attached_dp(connector);
583 struct intel_panel *panel = &connector->panel;
584 u16 current_level;
585 u8 current_mode;
586 int ret;
587
588 if (panel->backlight.edp.vesa.luminance_control_support) {
589 if (luminance_range->max_luminance) {
590 panel->backlight.max = luminance_range->max_luminance;
591 panel->backlight.min = luminance_range->min_luminance;
592 } else {
593 panel->backlight.max = 512;
594 panel->backlight.min = 0;
595 }
596 panel->backlight.level = intel_dp_aux_vesa_get_backlight(connector, 0);
597 panel->backlight.enabled = panel->backlight.level != 0;
598 drm_dbg_kms(display->drm,
599 "[CONNECTOR:%d:%s] AUX VESA Nits backlight level is controlled through DPCD\n",
600 connector->base.base.id, connector->base.name);
601 } else {
602 ret = drm_edp_backlight_init(&intel_dp->aux, &panel->backlight.edp.vesa.info,
603 panel->vbt.backlight.pwm_freq_hz, intel_dp->edp_dpcd,
604 ¤t_level, ¤t_mode);
605 if (ret < 0)
606 return ret;
607
608 drm_dbg_kms(display->drm,
609 "[CONNECTOR:%d:%s] AUX VESA backlight enable is controlled through %s\n",
610 connector->base.base.id, connector->base.name,
611 dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_enable));
612 drm_dbg_kms(display->drm,
613 "[CONNECTOR:%d:%s] AUX VESA backlight level is controlled through %s\n",
614 connector->base.base.id, connector->base.name,
615 dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_set));
616
617 if (!panel->backlight.edp.vesa.info.aux_set ||
618 !panel->backlight.edp.vesa.info.aux_enable) {
619 ret = panel->backlight.pwm_funcs->setup(connector, pipe);
620 if (ret < 0) {
621 drm_err(display->drm,
622 "[CONNECTOR:%d:%s] Failed to setup PWM backlight controls for eDP backlight: %d\n",
623 connector->base.base.id, connector->base.name, ret);
624 return ret;
625 }
626 }
627
628 if (panel->backlight.edp.vesa.info.aux_set) {
629 panel->backlight.max = panel->backlight.edp.vesa.info.max;
630 panel->backlight.min = 0;
631 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
632 panel->backlight.level = current_level;
633 panel->backlight.enabled = panel->backlight.level != 0;
634 } else {
635 panel->backlight.level = panel->backlight.max;
636 panel->backlight.enabled = false;
637 }
638 } else {
639 panel->backlight.max = panel->backlight.pwm_level_max;
640 panel->backlight.min = panel->backlight.pwm_level_min;
641 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_PWM) {
642 panel->backlight.level =
643 panel->backlight.pwm_funcs->get(connector, pipe);
644 panel->backlight.enabled = panel->backlight.pwm_enabled;
645 } else {
646 panel->backlight.level = panel->backlight.max;
647 panel->backlight.enabled = false;
648 }
649 }
650 }
651
652 drm_dbg_kms(display->drm,
653 "[CONNECTOR:%d:%s] Using AUX VESA interface for backlight control\n",
654 connector->base.base.id, connector->base.name);
655
656 return 0;
657 }
658
659 static bool
intel_dp_aux_supports_vesa_backlight(struct intel_connector * connector)660 intel_dp_aux_supports_vesa_backlight(struct intel_connector *connector)
661 {
662 struct intel_display *display = to_intel_display(connector);
663 struct intel_dp *intel_dp = intel_attached_dp(connector);
664 struct intel_panel *panel = &connector->panel;
665
666 if ((intel_dp->edp_dpcd[3] & DP_EDP_PANEL_LUMINANCE_CONTROL_CAPABLE)) {
667 drm_dbg_kms(display->drm,
668 "[CONNECTOR:%d:%s] AUX Luminance Based Backlight Control Supported!\n",
669 connector->base.base.id, connector->base.name);
670 panel->backlight.edp.vesa.luminance_control_support = true;
671 return true;
672 }
673
674 if (drm_edp_backlight_supported(intel_dp->edp_dpcd)) {
675 drm_dbg_kms(display->drm,
676 "[CONNECTOR:%d:%s] AUX Backlight Control Supported!\n",
677 connector->base.base.id, connector->base.name);
678 return true;
679 }
680 return false;
681 }
682
683 static const struct intel_panel_bl_funcs intel_dp_hdr_bl_funcs = {
684 .setup = intel_dp_aux_hdr_setup_backlight,
685 .enable = intel_dp_aux_hdr_enable_backlight,
686 .disable = intel_dp_aux_hdr_disable_backlight,
687 .set = intel_dp_aux_hdr_set_backlight,
688 .get = intel_dp_aux_hdr_get_backlight,
689 };
690
691 static const struct intel_panel_bl_funcs intel_dp_vesa_bl_funcs = {
692 .setup = intel_dp_aux_vesa_setup_backlight,
693 .enable = intel_dp_aux_vesa_enable_backlight,
694 .disable = intel_dp_aux_vesa_disable_backlight,
695 .set = intel_dp_aux_vesa_set_backlight,
696 .get = intel_dp_aux_vesa_get_backlight,
697 };
698
intel_dp_aux_init_backlight_funcs(struct intel_connector * connector)699 int intel_dp_aux_init_backlight_funcs(struct intel_connector *connector)
700 {
701 struct intel_display *display = to_intel_display(connector);
702 struct intel_dp *intel_dp = intel_attached_dp(connector);
703 struct drm_device *dev = connector->base.dev;
704 struct intel_panel *panel = &connector->panel;
705 bool try_intel_interface = false, try_vesa_interface = false;
706
707 /* Check the VBT and user's module parameters to figure out which
708 * interfaces to probe
709 */
710 switch (display->params.enable_dpcd_backlight) {
711 case INTEL_DP_AUX_BACKLIGHT_OFF:
712 return -ENODEV;
713 case INTEL_DP_AUX_BACKLIGHT_AUTO:
714 switch (panel->vbt.backlight.type) {
715 case INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE:
716 try_vesa_interface = true;
717 break;
718 case INTEL_BACKLIGHT_DISPLAY_DDI:
719 try_intel_interface = true;
720 break;
721 default:
722 return -ENODEV;
723 }
724 break;
725 case INTEL_DP_AUX_BACKLIGHT_ON:
726 if (panel->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE)
727 try_intel_interface = true;
728
729 try_vesa_interface = true;
730 break;
731 case INTEL_DP_AUX_BACKLIGHT_FORCE_VESA:
732 try_vesa_interface = true;
733 break;
734 case INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL:
735 try_intel_interface = true;
736 break;
737 }
738
739 /* For eDP 1.5 and above we are supposed to use VESA interface for brightness control */
740 if (intel_dp->edp_dpcd[0] >= DP_EDP_15)
741 try_vesa_interface = true;
742
743 /*
744 * Since Intel has their own backlight control interface, the majority of machines out there
745 * using DPCD backlight controls with Intel GPUs will be using this interface as opposed to
746 * the VESA interface. However, other GPUs (such as Nvidia's) will always use the VESA
747 * interface. This means that there's quite a number of panels out there that will advertise
748 * support for both interfaces, primarily systems with Intel/Nvidia hybrid GPU setups.
749 *
750 * There's a catch to this though: on many panels that advertise support for both
751 * interfaces, the VESA backlight interface will stop working once we've programmed the
752 * panel with Intel's OUI - which is also required for us to be able to detect Intel's
753 * backlight interface at all. This means that the only sensible way for us to detect both
754 * interfaces is to probe for Intel's first, and VESA's second.
755 */
756 if (try_intel_interface && intel_dp_aux_supports_hdr_backlight(connector) &&
757 intel_dp->edp_dpcd[0] <= DP_EDP_14b) {
758 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using Intel proprietary eDP backlight controls\n",
759 connector->base.base.id, connector->base.name);
760 panel->backlight.funcs = &intel_dp_hdr_bl_funcs;
761 return 0;
762 }
763
764 if (try_vesa_interface && intel_dp_aux_supports_vesa_backlight(connector)) {
765 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using VESA eDP backlight controls\n",
766 connector->base.base.id, connector->base.name);
767 panel->backlight.funcs = &intel_dp_vesa_bl_funcs;
768 return 0;
769 }
770
771 return -ENODEV;
772 }
773