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 void
intel_dp_aux_hdr_set_backlight(const struct drm_connector_state * conn_state,u32 level)229 intel_dp_aux_hdr_set_backlight(const struct drm_connector_state *conn_state, u32 level)
230 {
231 struct intel_connector *connector = to_intel_connector(conn_state->connector);
232 struct intel_panel *panel = &connector->panel;
233
234 if (intel_dp_in_hdr_mode(conn_state) ||
235 panel->backlight.edp.intel_cap.sdr_uses_aux) {
236 intel_dp_aux_hdr_set_aux_backlight(conn_state, level);
237 } else {
238 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level);
239
240 intel_backlight_set_pwm_level(conn_state, pwm_level);
241 }
242 }
243
244 static void
intel_dp_aux_write_content_luminance(struct intel_connector * connector,struct hdr_output_metadata * hdr_metadata)245 intel_dp_aux_write_content_luminance(struct intel_connector *connector,
246 struct hdr_output_metadata *hdr_metadata)
247 {
248 struct intel_display *display = to_intel_display(connector);
249 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
250 int ret;
251 u8 buf[4];
252
253 if (!intel_dp_has_gamut_metadata_dip(connector->encoder))
254 return;
255
256 buf[0] = hdr_metadata->hdmi_metadata_type1.max_cll & 0xFF;
257 buf[1] = (hdr_metadata->hdmi_metadata_type1.max_cll & 0xFF00) >> 8;
258 buf[2] = hdr_metadata->hdmi_metadata_type1.max_fall & 0xFF;
259 buf[3] = (hdr_metadata->hdmi_metadata_type1.max_fall & 0xFF00) >> 8;
260
261 ret = drm_dp_dpcd_write(&intel_dp->aux,
262 INTEL_EDP_HDR_CONTENT_LUMINANCE,
263 buf, sizeof(buf));
264 if (ret < 0)
265 drm_dbg_kms(display->drm,
266 "Content Luminance DPCD reg write failed, err:-%d\n",
267 ret);
268 }
269
270 static void
intel_dp_aux_fill_hdr_tcon_params(const struct drm_connector_state * conn_state,u8 * ctrl)271 intel_dp_aux_fill_hdr_tcon_params(const struct drm_connector_state *conn_state, u8 *ctrl)
272 {
273 struct intel_connector *connector = to_intel_connector(conn_state->connector);
274 struct intel_panel *panel = &connector->panel;
275 struct intel_display *display = to_intel_display(connector);
276
277 /*
278 * According to spec segmented backlight needs to be set whenever panel is in
279 * HDR mode.
280 */
281 if (intel_dp_in_hdr_mode(conn_state)) {
282 *ctrl |= INTEL_EDP_HDR_TCON_SEGMENTED_BACKLIGHT_ENABLE;
283 *ctrl |= INTEL_EDP_HDR_TCON_2084_DECODE_ENABLE;
284 }
285
286 if (DISPLAY_VER(display) < 11)
287 *ctrl &= ~INTEL_EDP_HDR_TCON_TONE_MAPPING_ENABLE;
288
289 if (panel->backlight.edp.intel_cap.supports_2020_gamut &&
290 (conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_RGB ||
291 conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_YCC ||
292 conn_state->colorspace == DRM_MODE_COLORIMETRY_BT2020_CYCC))
293 *ctrl |= INTEL_EDP_HDR_TCON_2020_GAMUT_ENABLE;
294
295 if (panel->backlight.edp.intel_cap.supports_sdp_colorimetry &&
296 intel_dp_has_gamut_metadata_dip(connector->encoder))
297 *ctrl |= INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX;
298 else
299 *ctrl &= ~INTEL_EDP_HDR_TCON_SDP_OVERRIDE_AUX;
300 }
301
302 static void
intel_dp_aux_hdr_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)303 intel_dp_aux_hdr_enable_backlight(const struct intel_crtc_state *crtc_state,
304 const struct drm_connector_state *conn_state, u32 level)
305 {
306 struct intel_display *display = to_intel_display(crtc_state);
307 struct intel_connector *connector = to_intel_connector(conn_state->connector);
308 struct intel_panel *panel = &connector->panel;
309 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
310 struct hdr_output_metadata *hdr_metadata;
311 int ret;
312 u8 old_ctrl, ctrl;
313
314 intel_dp_wait_source_oui(intel_dp);
315
316 ret = drm_dp_dpcd_readb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, &old_ctrl);
317 if (ret != 1) {
318 drm_err(display->drm,
319 "[CONNECTOR:%d:%s] Failed to read current backlight control mode: %d\n",
320 connector->base.base.id, connector->base.name, ret);
321 return;
322 }
323
324 ctrl = old_ctrl;
325 if (intel_dp_in_hdr_mode(conn_state) ||
326 panel->backlight.edp.intel_cap.sdr_uses_aux) {
327 ctrl |= INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE;
328
329 intel_dp_aux_hdr_set_aux_backlight(conn_state, level);
330 } else {
331 u32 pwm_level = intel_backlight_level_to_pwm(connector, level);
332
333 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);
334
335 ctrl &= ~INTEL_EDP_HDR_TCON_BRIGHTNESS_AUX_ENABLE;
336 }
337
338 intel_dp_aux_fill_hdr_tcon_params(conn_state, &ctrl);
339
340 if (ctrl != old_ctrl &&
341 drm_dp_dpcd_writeb(&intel_dp->aux, INTEL_EDP_HDR_GETSET_CTRL_PARAMS, ctrl) != 1)
342 drm_err(display->drm,
343 "[CONNECTOR:%d:%s] Failed to configure DPCD brightness controls\n",
344 connector->base.base.id, connector->base.name);
345
346 if (intel_dp_in_hdr_mode(conn_state)) {
347 hdr_metadata = conn_state->hdr_output_metadata->data;
348 intel_dp_aux_write_content_luminance(connector, hdr_metadata);
349 }
350 }
351
352 static void
intel_dp_aux_hdr_disable_backlight(const struct drm_connector_state * conn_state,u32 level)353 intel_dp_aux_hdr_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
354 {
355 struct intel_connector *connector = to_intel_connector(conn_state->connector);
356 struct intel_panel *panel = &connector->panel;
357
358 /* Nothing to do for AUX based backlight controls */
359 if (panel->backlight.edp.intel_cap.sdr_uses_aux)
360 return;
361
362 /* Note we want the actual pwm_level to be 0, regardless of pwm_min */
363 panel->backlight.pwm_funcs->disable(conn_state, intel_backlight_invert_pwm_level(connector, 0));
364 }
365
dpcd_vs_pwm_str(bool aux)366 static const char *dpcd_vs_pwm_str(bool aux)
367 {
368 return aux ? "DPCD" : "PWM";
369 }
370
backlight_unit_str(struct intel_panel * panel)371 static const char *backlight_unit_str(struct intel_panel *panel)
372 {
373 if (panel->backlight.edp.vesa.info.luminance_set)
374 return "NITS";
375 else if (panel->backlight.edp.vesa.info.aux_set)
376 return "Brightness %";
377 else
378 return "PWM";
379 }
380
381 static void
intel_dp_aux_write_panel_luminance_override(struct intel_connector * connector)382 intel_dp_aux_write_panel_luminance_override(struct intel_connector *connector)
383 {
384 struct intel_display *display = to_intel_display(connector);
385 struct intel_panel *panel = &connector->panel;
386 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
387 int ret;
388 u8 buf[4] = {};
389
390 buf[0] = panel->backlight.min & 0xFF;
391 buf[1] = (panel->backlight.min & 0xFF00) >> 8;
392 buf[2] = panel->backlight.max & 0xFF;
393 buf[3] = (panel->backlight.max & 0xFF00) >> 8;
394
395 ret = drm_dp_dpcd_write(&intel_dp->aux,
396 INTEL_EDP_HDR_PANEL_LUMINANCE_OVERRIDE,
397 buf, sizeof(buf));
398 if (ret < 0)
399 drm_dbg_kms(display->drm,
400 "Panel Luminance DPCD reg write failed, err:-%d\n",
401 ret);
402 }
403
404 static int
intel_dp_aux_hdr_setup_backlight(struct intel_connector * connector,enum pipe pipe)405 intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pipe)
406 {
407 struct intel_display *display = to_intel_display(connector);
408 struct intel_panel *panel = &connector->panel;
409 struct drm_luminance_range_info *luminance_range =
410 &connector->base.display_info.luminance_range;
411 int ret;
412
413 drm_dbg_kms(display->drm,
414 "[CONNECTOR:%d:%s] SDR backlight is controlled through %s\n",
415 connector->base.base.id, connector->base.name,
416 dpcd_vs_pwm_str(panel->backlight.edp.intel_cap.sdr_uses_aux));
417
418 if (!panel->backlight.edp.intel_cap.sdr_uses_aux) {
419 ret = panel->backlight.pwm_funcs->setup(connector, pipe);
420 if (ret < 0) {
421 drm_err(display->drm,
422 "[CONNECTOR:%d:%s] Failed to setup SDR backlight controls through PWM: %d\n",
423 connector->base.base.id, connector->base.name, ret);
424 return ret;
425 }
426 }
427
428 if (luminance_range->max_luminance) {
429 panel->backlight.max = luminance_range->max_luminance;
430 panel->backlight.min = luminance_range->min_luminance;
431 } else {
432 panel->backlight.max = 512;
433 panel->backlight.min = 0;
434 }
435
436 intel_dp_aux_write_panel_luminance_override(connector);
437
438 drm_dbg_kms(display->drm,
439 "[CONNECTOR:%d:%s] Using AUX HDR interface for backlight control (range %d..%d)\n",
440 connector->base.base.id, connector->base.name,
441 panel->backlight.min, panel->backlight.max);
442
443 panel->backlight.level = intel_dp_aux_hdr_get_backlight(connector, pipe);
444 panel->backlight.enabled = panel->backlight.level != 0;
445
446 return 0;
447 }
448
449 /* VESA backlight callbacks */
intel_dp_aux_vesa_get_backlight(struct intel_connector * connector,enum pipe unused)450 static u32 intel_dp_aux_vesa_get_backlight(struct intel_connector *connector, enum pipe unused)
451 {
452 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
453 struct intel_panel *panel = &connector->panel;
454 u8 buf[3];
455 u32 val = 0;
456 int ret;
457
458 if (panel->backlight.edp.vesa.luminance_control_support) {
459 ret = drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE, buf,
460 sizeof(buf));
461 if (ret < 0) {
462 drm_err(intel_dp->aux.drm_dev,
463 "[CONNECTOR:%d:%s] Failed to read Luminance from DPCD\n",
464 connector->base.base.id, connector->base.name);
465 return 0;
466 }
467
468 val |= buf[0] | buf[1] << 8 | buf[2] << 16;
469 return val / 1000;
470 }
471
472 return panel->backlight.level;
473 }
474
475 static void
intel_dp_aux_vesa_set_backlight(const struct drm_connector_state * conn_state,u32 level)476 intel_dp_aux_vesa_set_backlight(const struct drm_connector_state *conn_state, u32 level)
477 {
478 struct intel_connector *connector = to_intel_connector(conn_state->connector);
479 struct intel_panel *panel = &connector->panel;
480 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
481
482 if (!panel->backlight.edp.vesa.info.aux_set) {
483 const u32 pwm_level = intel_backlight_level_to_pwm(connector, level);
484
485 intel_backlight_set_pwm_level(conn_state, pwm_level);
486 }
487
488 drm_edp_backlight_set_level(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);
489 }
490
491 static void
intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)492 intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state,
493 const struct drm_connector_state *conn_state, u32 level)
494 {
495 struct intel_connector *connector = to_intel_connector(conn_state->connector);
496 struct intel_panel *panel = &connector->panel;
497 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
498
499 if (!(panel->backlight.edp.vesa.info.aux_enable ||
500 panel->backlight.edp.vesa.info.luminance_set)) {
501 u32 pwm_level;
502
503 if (!panel->backlight.edp.vesa.info.aux_set)
504 pwm_level = intel_backlight_level_to_pwm(connector, level);
505 else
506 pwm_level = intel_backlight_invert_pwm_level(connector,
507 panel->backlight.pwm_level_max);
508
509 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);
510 }
511
512 drm_edp_backlight_enable(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);
513 }
514
intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state * old_conn_state,u32 level)515 static void intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state *old_conn_state,
516 u32 level)
517 {
518 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
519 struct intel_panel *panel = &connector->panel;
520 struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
521
522 drm_edp_backlight_disable(&intel_dp->aux, &panel->backlight.edp.vesa.info);
523
524 if (!(panel->backlight.edp.vesa.info.aux_enable ||
525 panel->backlight.edp.vesa.info.luminance_set))
526 panel->backlight.pwm_funcs->disable(old_conn_state,
527 intel_backlight_invert_pwm_level(connector, 0));
528 }
529
intel_dp_aux_vesa_setup_backlight(struct intel_connector * connector,enum pipe pipe)530 static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector, enum pipe pipe)
531 {
532 struct intel_display *display = to_intel_display(connector);
533 struct drm_luminance_range_info *luminance_range =
534 &connector->base.display_info.luminance_range;
535 struct intel_dp *intel_dp = intel_attached_dp(connector);
536 struct intel_panel *panel = &connector->panel;
537 u32 current_level;
538 u8 current_mode;
539 int ret;
540
541 ret = drm_edp_backlight_init(&intel_dp->aux, &panel->backlight.edp.vesa.info,
542 luminance_range->max_luminance,
543 panel->vbt.backlight.pwm_freq_hz,
544 intel_dp->edp_dpcd, ¤t_level, ¤t_mode,
545 panel->backlight.edp.vesa.luminance_control_support);
546 if (ret < 0)
547 return ret;
548
549 drm_dbg_kms(display->drm,
550 "[CONNECTOR:%d:%s] AUX VESA backlight enable is controlled through %s\n",
551 connector->base.base.id, connector->base.name,
552 dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_enable ||
553 panel->backlight.edp.vesa.info.luminance_set));
554 drm_dbg_kms(display->drm,
555 "[CONNECTOR:%d:%s] AUX VESA backlight level is controlled through %s using %s values\n",
556 connector->base.base.id, connector->base.name,
557 dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_set ||
558 panel->backlight.edp.vesa.info.luminance_set),
559 backlight_unit_str(panel));
560
561 if (!panel->backlight.edp.vesa.info.aux_set ||
562 !panel->backlight.edp.vesa.info.aux_enable) {
563 ret = panel->backlight.pwm_funcs->setup(connector, pipe);
564 if (ret < 0) {
565 drm_err(display->drm,
566 "[CONNECTOR:%d:%s] Failed to setup PWM backlight controls for eDP backlight: %d\n",
567 connector->base.base.id, connector->base.name, ret);
568 return ret;
569 }
570 }
571
572 if (panel->backlight.edp.vesa.info.luminance_set) {
573 if (luminance_range->max_luminance) {
574 panel->backlight.max = panel->backlight.edp.vesa.info.max;
575 panel->backlight.min = luminance_range->min_luminance;
576 } else {
577 panel->backlight.max = 512;
578 panel->backlight.min = 0;
579 }
580 panel->backlight.level = intel_dp_aux_vesa_get_backlight(connector, 0);
581 panel->backlight.enabled = panel->backlight.level != 0;
582 } else if (panel->backlight.edp.vesa.info.aux_set) {
583 panel->backlight.max = panel->backlight.edp.vesa.info.max;
584 panel->backlight.min = 0;
585 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
586 panel->backlight.level = current_level;
587 panel->backlight.enabled = panel->backlight.level != 0;
588 } else {
589 panel->backlight.level = panel->backlight.max;
590 panel->backlight.enabled = false;
591 }
592 } else {
593 panel->backlight.max = panel->backlight.pwm_level_max;
594 panel->backlight.min = panel->backlight.pwm_level_min;
595 if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_PWM) {
596 panel->backlight.level =
597 panel->backlight.pwm_funcs->get(connector, pipe);
598 panel->backlight.enabled = panel->backlight.pwm_enabled;
599 } else {
600 panel->backlight.level = panel->backlight.max;
601 panel->backlight.enabled = false;
602 }
603 }
604
605 drm_dbg_kms(display->drm,
606 "[CONNECTOR:%d:%s] Using AUX VESA interface for backlight control\n",
607 connector->base.base.id, connector->base.name);
608
609 return 0;
610 }
611
612 static bool
check_if_vesa_backlight_possible(struct intel_dp * intel_dp)613 check_if_vesa_backlight_possible(struct intel_dp *intel_dp)
614 {
615 int ret;
616 u8 bit_min, bit_max;
617
618 /*
619 * Since we only support Fully AUX Based VESA Backlight interface make sure
620 * backlight enable is possible via AUX along with backlight adjustment
621 */
622 if (!(intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP &&
623 intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP))
624 return false;
625
626 ret = drm_dp_dpcd_read_byte(&intel_dp->aux, DP_EDP_PWMGEN_BIT_COUNT_CAP_MIN, &bit_min);
627 if (ret < 0)
628 return false;
629
630 bit_min &= DP_EDP_PWMGEN_BIT_COUNT_MASK;
631 if (bit_min < 1)
632 return false;
633
634 ret = drm_dp_dpcd_read_byte(&intel_dp->aux, DP_EDP_PWMGEN_BIT_COUNT_CAP_MAX, &bit_max);
635 if (ret < 0)
636 return false;
637
638 bit_max &= DP_EDP_PWMGEN_BIT_COUNT_MASK;
639 if (bit_max < bit_min)
640 return false;
641
642 return true;
643 }
644
645 static bool
intel_dp_aux_supports_vesa_backlight(struct intel_connector * connector)646 intel_dp_aux_supports_vesa_backlight(struct intel_connector *connector)
647 {
648 struct intel_display *display = to_intel_display(connector);
649 struct intel_dp *intel_dp = intel_attached_dp(connector);
650 struct intel_panel *panel = &connector->panel;
651
652 if ((intel_dp->edp_dpcd[3] & DP_EDP_PANEL_LUMINANCE_CONTROL_CAPABLE) &&
653 (intel_dp->edp_dpcd[3] & DP_EDP_SMOOTH_BRIGHTNESS_CAPABLE)) {
654 drm_dbg_kms(display->drm,
655 "[CONNECTOR:%d:%s] AUX Luminance Based Backlight Control Supported!\n",
656 connector->base.base.id, connector->base.name);
657 panel->backlight.edp.vesa.luminance_control_support = true;
658 return true;
659 }
660
661 if (drm_edp_backlight_supported(intel_dp->edp_dpcd) &&
662 check_if_vesa_backlight_possible(intel_dp)) {
663 drm_dbg_kms(display->drm,
664 "[CONNECTOR:%d:%s] AUX Backlight Control Supported!\n",
665 connector->base.base.id, connector->base.name);
666 return true;
667 }
668
669 return false;
670 }
671
672 static const struct intel_panel_bl_funcs intel_dp_hdr_bl_funcs = {
673 .setup = intel_dp_aux_hdr_setup_backlight,
674 .enable = intel_dp_aux_hdr_enable_backlight,
675 .disable = intel_dp_aux_hdr_disable_backlight,
676 .set = intel_dp_aux_hdr_set_backlight,
677 .get = intel_dp_aux_hdr_get_backlight,
678 };
679
680 static const struct intel_panel_bl_funcs intel_dp_vesa_bl_funcs = {
681 .setup = intel_dp_aux_vesa_setup_backlight,
682 .enable = intel_dp_aux_vesa_enable_backlight,
683 .disable = intel_dp_aux_vesa_disable_backlight,
684 .set = intel_dp_aux_vesa_set_backlight,
685 .get = intel_dp_aux_vesa_get_backlight,
686 };
687
intel_dp_aux_init_backlight_funcs(struct intel_connector * connector)688 int intel_dp_aux_init_backlight_funcs(struct intel_connector *connector)
689 {
690 struct intel_display *display = to_intel_display(connector);
691 struct intel_dp *intel_dp = intel_attached_dp(connector);
692 struct drm_device *dev = connector->base.dev;
693 struct intel_panel *panel = &connector->panel;
694 bool try_intel_interface = false, try_vesa_interface = false;
695
696 /* Check the VBT and user's module parameters to figure out which
697 * interfaces to probe
698 */
699 switch (display->params.enable_dpcd_backlight) {
700 case INTEL_DP_AUX_BACKLIGHT_OFF:
701 return -ENODEV;
702 case INTEL_DP_AUX_BACKLIGHT_AUTO:
703 switch (panel->vbt.backlight.type) {
704 case INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE:
705 try_vesa_interface = true;
706 break;
707 case INTEL_BACKLIGHT_DISPLAY_DDI:
708 try_intel_interface = true;
709 break;
710 default:
711 return -ENODEV;
712 }
713 break;
714 case INTEL_DP_AUX_BACKLIGHT_ON:
715 if (panel->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE)
716 try_intel_interface = true;
717
718 try_vesa_interface = true;
719 break;
720 case INTEL_DP_AUX_BACKLIGHT_FORCE_VESA:
721 try_vesa_interface = true;
722 break;
723 case INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL:
724 try_intel_interface = true;
725 break;
726 }
727
728 /* For eDP 1.5 and above we are supposed to use VESA interface for brightness control */
729 if (intel_dp->edp_dpcd[0] >= DP_EDP_15)
730 try_vesa_interface = true;
731
732 /*
733 * Since Intel has their own backlight control interface, the majority of machines out there
734 * using DPCD backlight controls with Intel GPUs will be using this interface as opposed to
735 * the VESA interface. However, other GPUs (such as Nvidia's) will always use the VESA
736 * interface. This means that there's quite a number of panels out there that will advertise
737 * support for both interfaces, primarily systems with Intel/Nvidia hybrid GPU setups.
738 *
739 * There's a catch to this though: on many panels that advertise support for both
740 * interfaces, the VESA backlight interface will stop working once we've programmed the
741 * panel with Intel's OUI - which is also required for us to be able to detect Intel's
742 * backlight interface at all. This means that the only sensible way for us to detect both
743 * interfaces is to probe for Intel's first, and VESA's second.
744 */
745 if (try_intel_interface && intel_dp->edp_dpcd[0] <= DP_EDP_14b &&
746 intel_dp_aux_supports_hdr_backlight(connector)) {
747 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using Intel proprietary eDP backlight controls\n",
748 connector->base.base.id, connector->base.name);
749 panel->backlight.funcs = &intel_dp_hdr_bl_funcs;
750 return 0;
751 }
752
753 if (try_vesa_interface && intel_dp_aux_supports_vesa_backlight(connector)) {
754 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using VESA eDP backlight controls\n",
755 connector->base.base.id, connector->base.name);
756 panel->backlight.funcs = &intel_dp_vesa_bl_funcs;
757 return 0;
758 }
759
760 return -ENODEV;
761 }
762