1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2021 Intel Corporation
4 */
5
6 #include <linux/backlight.h>
7 #include <linux/kernel.h>
8 #include <linux/pwm.h>
9 #include <linux/string_helpers.h>
10
11 #include <acpi/video.h>
12
13 #include "i915_reg.h"
14 #include "intel_backlight.h"
15 #include "intel_backlight_regs.h"
16 #include "intel_connector.h"
17 #include "intel_de.h"
18 #include "intel_display_types.h"
19 #include "intel_dp_aux_backlight.h"
20 #include "intel_dsi_dcs_backlight.h"
21 #include "intel_panel.h"
22 #include "intel_pci_config.h"
23 #include "intel_pps.h"
24 #include "intel_quirks.h"
25
26 /**
27 * scale - scale values from one range to another
28 * @source_val: value in range [@source_min..@source_max]
29 * @source_min: minimum legal value for @source_val
30 * @source_max: maximum legal value for @source_val
31 * @target_min: corresponding target value for @source_min
32 * @target_max: corresponding target value for @source_max
33 *
34 * Return @source_val in range [@source_min..@source_max] scaled to range
35 * [@target_min..@target_max].
36 */
scale(u32 source_val,u32 source_min,u32 source_max,u32 target_min,u32 target_max)37 static u32 scale(u32 source_val,
38 u32 source_min, u32 source_max,
39 u32 target_min, u32 target_max)
40 {
41 u64 target_val;
42
43 WARN_ON(source_min > source_max);
44 WARN_ON(target_min > target_max);
45
46 /* defensive */
47 source_val = clamp(source_val, source_min, source_max);
48
49 /* avoid overflows */
50 target_val = mul_u32_u32(source_val - source_min,
51 target_max - target_min);
52 target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
53 target_val += target_min;
54
55 return target_val;
56 }
57
58 /*
59 * Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
60 * to [hw_min..hw_max].
61 */
clamp_user_to_hw(struct intel_connector * connector,u32 user_level,u32 user_max)62 static u32 clamp_user_to_hw(struct intel_connector *connector,
63 u32 user_level, u32 user_max)
64 {
65 struct intel_panel *panel = &connector->panel;
66 u32 hw_level;
67
68 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
69 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
70
71 return hw_level;
72 }
73
74 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
scale_hw_to_user(struct intel_connector * connector,u32 hw_level,u32 user_max)75 static u32 scale_hw_to_user(struct intel_connector *connector,
76 u32 hw_level, u32 user_max)
77 {
78 struct intel_panel *panel = &connector->panel;
79
80 return scale(hw_level, panel->backlight.min, panel->backlight.max,
81 0, user_max);
82 }
83
intel_backlight_invert_pwm_level(struct intel_connector * connector,u32 val)84 u32 intel_backlight_invert_pwm_level(struct intel_connector *connector, u32 val)
85 {
86 struct drm_i915_private *i915 = to_i915(connector->base.dev);
87 struct intel_panel *panel = &connector->panel;
88
89 drm_WARN_ON(&i915->drm, panel->backlight.pwm_level_max == 0);
90
91 if (i915->params.invert_brightness < 0)
92 return val;
93
94 if (i915->params.invert_brightness > 0 ||
95 intel_has_quirk(i915, QUIRK_INVERT_BRIGHTNESS)) {
96 return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min;
97 }
98
99 return val;
100 }
101
intel_backlight_set_pwm_level(const struct drm_connector_state * conn_state,u32 val)102 void intel_backlight_set_pwm_level(const struct drm_connector_state *conn_state, u32 val)
103 {
104 struct intel_connector *connector = to_intel_connector(conn_state->connector);
105 struct drm_i915_private *i915 = to_i915(connector->base.dev);
106 struct intel_panel *panel = &connector->panel;
107
108 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] set backlight PWM = %d\n",
109 connector->base.base.id, connector->base.name, val);
110 panel->backlight.pwm_funcs->set(conn_state, val);
111 }
112
intel_backlight_level_to_pwm(struct intel_connector * connector,u32 val)113 u32 intel_backlight_level_to_pwm(struct intel_connector *connector, u32 val)
114 {
115 struct drm_i915_private *i915 = to_i915(connector->base.dev);
116 struct intel_panel *panel = &connector->panel;
117
118 drm_WARN_ON_ONCE(&i915->drm,
119 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
120
121 val = scale(val, panel->backlight.min, panel->backlight.max,
122 panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
123
124 return intel_backlight_invert_pwm_level(connector, val);
125 }
126
intel_backlight_level_from_pwm(struct intel_connector * connector,u32 val)127 u32 intel_backlight_level_from_pwm(struct intel_connector *connector, u32 val)
128 {
129 struct drm_i915_private *i915 = to_i915(connector->base.dev);
130 struct intel_panel *panel = &connector->panel;
131
132 drm_WARN_ON_ONCE(&i915->drm,
133 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
134
135 if (i915->params.invert_brightness > 0 ||
136 (i915->params.invert_brightness == 0 && intel_has_quirk(i915, QUIRK_INVERT_BRIGHTNESS)))
137 val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min);
138
139 return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max,
140 panel->backlight.min, panel->backlight.max);
141 }
142
lpt_get_backlight(struct intel_connector * connector,enum pipe unused)143 static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused)
144 {
145 struct drm_i915_private *i915 = to_i915(connector->base.dev);
146
147 return intel_de_read(i915, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
148 }
149
pch_get_backlight(struct intel_connector * connector,enum pipe unused)150 static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused)
151 {
152 struct drm_i915_private *i915 = to_i915(connector->base.dev);
153
154 return intel_de_read(i915, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
155 }
156
i9xx_get_backlight(struct intel_connector * connector,enum pipe unused)157 static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused)
158 {
159 struct drm_i915_private *i915 = to_i915(connector->base.dev);
160 struct intel_panel *panel = &connector->panel;
161 u32 val;
162
163 val = intel_de_read(i915, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
164 if (DISPLAY_VER(i915) < 4)
165 val >>= 1;
166
167 if (panel->backlight.combination_mode) {
168 u8 lbpc;
169
170 pci_read_config_byte(to_pci_dev(i915->drm.dev), LBPC, &lbpc);
171 val *= lbpc;
172 }
173
174 return val;
175 }
176
vlv_get_backlight(struct intel_connector * connector,enum pipe pipe)177 static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe)
178 {
179 struct drm_i915_private *i915 = to_i915(connector->base.dev);
180
181 if (drm_WARN_ON(&i915->drm, pipe != PIPE_A && pipe != PIPE_B))
182 return 0;
183
184 return intel_de_read(i915, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
185 }
186
bxt_get_backlight(struct intel_connector * connector,enum pipe unused)187 static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused)
188 {
189 struct drm_i915_private *i915 = to_i915(connector->base.dev);
190 struct intel_panel *panel = &connector->panel;
191
192 return intel_de_read(i915, BXT_BLC_PWM_DUTY(panel->backlight.controller));
193 }
194
ext_pwm_get_backlight(struct intel_connector * connector,enum pipe unused)195 static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused)
196 {
197 struct intel_panel *panel = &connector->panel;
198 struct pwm_state state;
199
200 pwm_get_state(panel->backlight.pwm, &state);
201 return pwm_get_relative_duty_cycle(&state, 100);
202 }
203
lpt_set_backlight(const struct drm_connector_state * conn_state,u32 level)204 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
205 {
206 struct intel_connector *connector = to_intel_connector(conn_state->connector);
207 struct drm_i915_private *i915 = to_i915(connector->base.dev);
208 u32 val;
209
210 val = intel_de_read(i915, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
211 intel_de_write(i915, BLC_PWM_PCH_CTL2, val | level);
212 }
213
pch_set_backlight(const struct drm_connector_state * conn_state,u32 level)214 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
215 {
216 struct intel_connector *connector = to_intel_connector(conn_state->connector);
217 struct drm_i915_private *i915 = to_i915(connector->base.dev);
218 u32 tmp;
219
220 tmp = intel_de_read(i915, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
221 intel_de_write(i915, BLC_PWM_CPU_CTL, tmp | level);
222 }
223
i9xx_set_backlight(const struct drm_connector_state * conn_state,u32 level)224 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
225 {
226 struct intel_connector *connector = to_intel_connector(conn_state->connector);
227 struct drm_i915_private *i915 = to_i915(connector->base.dev);
228 struct intel_panel *panel = &connector->panel;
229 u32 tmp, mask;
230
231 drm_WARN_ON(&i915->drm, panel->backlight.pwm_level_max == 0);
232
233 if (panel->backlight.combination_mode) {
234 u8 lbpc;
235
236 lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1;
237 level /= lbpc;
238 pci_write_config_byte(to_pci_dev(i915->drm.dev), LBPC, lbpc);
239 }
240
241 if (DISPLAY_VER(i915) == 4) {
242 mask = BACKLIGHT_DUTY_CYCLE_MASK;
243 } else {
244 level <<= 1;
245 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
246 }
247
248 tmp = intel_de_read(i915, BLC_PWM_CTL) & ~mask;
249 intel_de_write(i915, BLC_PWM_CTL, tmp | level);
250 }
251
vlv_set_backlight(const struct drm_connector_state * conn_state,u32 level)252 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
253 {
254 struct intel_connector *connector = to_intel_connector(conn_state->connector);
255 struct drm_i915_private *i915 = to_i915(connector->base.dev);
256 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
257 u32 tmp;
258
259 tmp = intel_de_read(i915, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
260 intel_de_write(i915, VLV_BLC_PWM_CTL(pipe), tmp | level);
261 }
262
bxt_set_backlight(const struct drm_connector_state * conn_state,u32 level)263 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
264 {
265 struct intel_connector *connector = to_intel_connector(conn_state->connector);
266 struct drm_i915_private *i915 = to_i915(connector->base.dev);
267 struct intel_panel *panel = &connector->panel;
268
269 intel_de_write(i915, BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
270 }
271
ext_pwm_set_backlight(const struct drm_connector_state * conn_state,u32 level)272 static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
273 {
274 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
275
276 pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
277 pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
278 }
279
280 static void
intel_panel_actually_set_backlight(const struct drm_connector_state * conn_state,u32 level)281 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
282 {
283 struct intel_connector *connector = to_intel_connector(conn_state->connector);
284 struct drm_i915_private *i915 = to_i915(connector->base.dev);
285 struct intel_panel *panel = &connector->panel;
286
287 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] set backlight level = %d\n",
288 connector->base.base.id, connector->base.name, level);
289
290 panel->backlight.funcs->set(conn_state, level);
291 }
292
293 /* set backlight brightness to level in range [0..max], assuming hw min is
294 * respected.
295 */
intel_backlight_set_acpi(const struct drm_connector_state * conn_state,u32 user_level,u32 user_max)296 void intel_backlight_set_acpi(const struct drm_connector_state *conn_state,
297 u32 user_level, u32 user_max)
298 {
299 struct intel_connector *connector = to_intel_connector(conn_state->connector);
300 struct drm_i915_private *i915 = to_i915(connector->base.dev);
301 struct intel_panel *panel = &connector->panel;
302 u32 hw_level;
303
304 /*
305 * Lack of crtc may occur during driver init because
306 * connection_mutex isn't held across the entire backlight
307 * setup + modeset readout, and the BIOS can issue the
308 * requests at any time.
309 */
310 if (!panel->backlight.present || !conn_state->crtc)
311 return;
312
313 mutex_lock(&i915->display.backlight.lock);
314
315 drm_WARN_ON(&i915->drm, panel->backlight.max == 0);
316
317 hw_level = clamp_user_to_hw(connector, user_level, user_max);
318 panel->backlight.level = hw_level;
319
320 if (panel->backlight.device)
321 panel->backlight.device->props.brightness =
322 scale_hw_to_user(connector,
323 panel->backlight.level,
324 panel->backlight.device->props.max_brightness);
325
326 if (panel->backlight.enabled)
327 intel_panel_actually_set_backlight(conn_state, hw_level);
328
329 mutex_unlock(&i915->display.backlight.lock);
330 }
331
lpt_disable_backlight(const struct drm_connector_state * old_conn_state,u32 level)332 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
333 {
334 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
335 struct drm_i915_private *i915 = to_i915(connector->base.dev);
336 u32 tmp;
337
338 intel_backlight_set_pwm_level(old_conn_state, level);
339
340 /*
341 * Although we don't support or enable CPU PWM with LPT/SPT based
342 * systems, it may have been enabled prior to loading the
343 * driver. Disable to avoid warnings on LCPLL disable.
344 *
345 * This needs rework if we need to add support for CPU PWM on PCH split
346 * platforms.
347 */
348 tmp = intel_de_read(i915, BLC_PWM_CPU_CTL2);
349 if (tmp & BLM_PWM_ENABLE) {
350 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] CPU backlight was enabled, disabling\n",
351 connector->base.base.id, connector->base.name);
352 intel_de_write(i915, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
353 }
354
355 intel_de_rmw(i915, BLC_PWM_PCH_CTL1, BLM_PCH_PWM_ENABLE, 0);
356 }
357
pch_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)358 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
359 {
360 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
361 struct drm_i915_private *i915 = to_i915(connector->base.dev);
362
363 intel_backlight_set_pwm_level(old_conn_state, val);
364
365 intel_de_rmw(i915, BLC_PWM_CPU_CTL2, BLM_PWM_ENABLE, 0);
366
367 intel_de_rmw(i915, BLC_PWM_PCH_CTL1, BLM_PCH_PWM_ENABLE, 0);
368 }
369
i9xx_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)370 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
371 {
372 intel_backlight_set_pwm_level(old_conn_state, val);
373 }
374
i965_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)375 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
376 {
377 struct drm_i915_private *i915 = to_i915(old_conn_state->connector->dev);
378
379 intel_backlight_set_pwm_level(old_conn_state, val);
380
381 intel_de_rmw(i915, BLC_PWM_CTL2, BLM_PWM_ENABLE, 0);
382 }
383
vlv_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)384 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
385 {
386 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
387 struct drm_i915_private *i915 = to_i915(connector->base.dev);
388 enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
389
390 intel_backlight_set_pwm_level(old_conn_state, val);
391
392 intel_de_rmw(i915, VLV_BLC_PWM_CTL2(pipe), BLM_PWM_ENABLE, 0);
393 }
394
bxt_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)395 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
396 {
397 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
398 struct drm_i915_private *i915 = to_i915(connector->base.dev);
399 struct intel_panel *panel = &connector->panel;
400
401 intel_backlight_set_pwm_level(old_conn_state, val);
402
403 intel_de_rmw(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
404 BXT_BLC_PWM_ENABLE, 0);
405
406 if (panel->backlight.controller == 1)
407 intel_de_rmw(i915, UTIL_PIN_CTL, UTIL_PIN_ENABLE, 0);
408 }
409
cnp_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)410 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
411 {
412 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
413 struct drm_i915_private *i915 = to_i915(connector->base.dev);
414 struct intel_panel *panel = &connector->panel;
415
416 intel_backlight_set_pwm_level(old_conn_state, val);
417
418 intel_de_rmw(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
419 BXT_BLC_PWM_ENABLE, 0);
420 }
421
ext_pwm_disable_backlight(const struct drm_connector_state * old_conn_state,u32 level)422 static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
423 {
424 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
425 struct intel_panel *panel = &connector->panel;
426
427 intel_backlight_set_pwm_level(old_conn_state, level);
428
429 panel->backlight.pwm_state.enabled = false;
430 pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
431 }
432
intel_backlight_disable(const struct drm_connector_state * old_conn_state)433 void intel_backlight_disable(const struct drm_connector_state *old_conn_state)
434 {
435 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
436 struct drm_i915_private *i915 = to_i915(connector->base.dev);
437 struct intel_panel *panel = &connector->panel;
438
439 if (!panel->backlight.present)
440 return;
441
442 /*
443 * Do not disable backlight on the vga_switcheroo path. When switching
444 * away from i915, the other client may depend on i915 to handle the
445 * backlight. This will leave the backlight on unnecessarily when
446 * another client is not activated.
447 */
448 if (i915->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
449 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] Skipping backlight disable on vga switch\n",
450 connector->base.base.id, connector->base.name);
451 return;
452 }
453
454 mutex_lock(&i915->display.backlight.lock);
455
456 if (panel->backlight.device)
457 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
458 panel->backlight.enabled = false;
459 panel->backlight.funcs->disable(old_conn_state, 0);
460
461 mutex_unlock(&i915->display.backlight.lock);
462 }
463
lpt_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)464 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
465 const struct drm_connector_state *conn_state, u32 level)
466 {
467 struct intel_connector *connector = to_intel_connector(conn_state->connector);
468 struct drm_i915_private *i915 = to_i915(connector->base.dev);
469 struct intel_panel *panel = &connector->panel;
470 u32 pch_ctl1, pch_ctl2;
471
472 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
473 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
474 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PCH backlight already enabled\n",
475 connector->base.base.id, connector->base.name);
476 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
477 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
478 }
479
480 if (HAS_PCH_LPT(i915))
481 intel_de_rmw(i915, SOUTH_CHICKEN2, LPT_PWM_GRANULARITY,
482 panel->backlight.alternate_pwm_increment ?
483 LPT_PWM_GRANULARITY : 0);
484 else
485 intel_de_rmw(i915, SOUTH_CHICKEN1, SPT_PWM_GRANULARITY,
486 panel->backlight.alternate_pwm_increment ?
487 SPT_PWM_GRANULARITY : 0);
488
489 pch_ctl2 = panel->backlight.pwm_level_max << 16;
490 intel_de_write(i915, BLC_PWM_PCH_CTL2, pch_ctl2);
491
492 pch_ctl1 = 0;
493 if (panel->backlight.active_low_pwm)
494 pch_ctl1 |= BLM_PCH_POLARITY;
495
496 /* After LPT, override is the default. */
497 if (HAS_PCH_LPT(i915))
498 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
499
500 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
501 intel_de_posting_read(i915, BLC_PWM_PCH_CTL1);
502 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
503
504 /* This won't stick until the above enable. */
505 intel_backlight_set_pwm_level(conn_state, level);
506 }
507
pch_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)508 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
509 const struct drm_connector_state *conn_state, u32 level)
510 {
511 struct intel_connector *connector = to_intel_connector(conn_state->connector);
512 struct drm_i915_private *i915 = to_i915(connector->base.dev);
513 struct intel_panel *panel = &connector->panel;
514 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
515 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
516
517 cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
518 if (cpu_ctl2 & BLM_PWM_ENABLE) {
519 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] CPU backlight already enabled\n",
520 connector->base.base.id, connector->base.name);
521 cpu_ctl2 &= ~BLM_PWM_ENABLE;
522 intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2);
523 }
524
525 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
526 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
527 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PCH backlight already enabled\n",
528 connector->base.base.id, connector->base.name);
529 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
530 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
531 }
532
533 if (cpu_transcoder == TRANSCODER_EDP)
534 cpu_ctl2 = BLM_TRANSCODER_EDP;
535 else
536 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
537 intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2);
538 intel_de_posting_read(i915, BLC_PWM_CPU_CTL2);
539 intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
540
541 /* This won't stick until the above enable. */
542 intel_backlight_set_pwm_level(conn_state, level);
543
544 pch_ctl2 = panel->backlight.pwm_level_max << 16;
545 intel_de_write(i915, BLC_PWM_PCH_CTL2, pch_ctl2);
546
547 pch_ctl1 = 0;
548 if (panel->backlight.active_low_pwm)
549 pch_ctl1 |= BLM_PCH_POLARITY;
550
551 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
552 intel_de_posting_read(i915, BLC_PWM_PCH_CTL1);
553 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
554 }
555
i9xx_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)556 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
557 const struct drm_connector_state *conn_state, u32 level)
558 {
559 struct intel_connector *connector = to_intel_connector(conn_state->connector);
560 struct drm_i915_private *i915 = to_i915(connector->base.dev);
561 struct intel_panel *panel = &connector->panel;
562 u32 ctl, freq;
563
564 ctl = intel_de_read(i915, BLC_PWM_CTL);
565 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
566 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
567 connector->base.base.id, connector->base.name);
568 intel_de_write(i915, BLC_PWM_CTL, 0);
569 }
570
571 freq = panel->backlight.pwm_level_max;
572 if (panel->backlight.combination_mode)
573 freq /= 0xff;
574
575 ctl = freq << 17;
576 if (panel->backlight.combination_mode)
577 ctl |= BLM_LEGACY_MODE;
578 if (IS_PINEVIEW(i915) && panel->backlight.active_low_pwm)
579 ctl |= BLM_POLARITY_PNV;
580
581 intel_de_write(i915, BLC_PWM_CTL, ctl);
582 intel_de_posting_read(i915, BLC_PWM_CTL);
583
584 /* XXX: combine this into above write? */
585 intel_backlight_set_pwm_level(conn_state, level);
586
587 /*
588 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
589 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
590 * that has backlight.
591 */
592 if (DISPLAY_VER(i915) == 2)
593 intel_de_write(i915, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
594 }
595
i965_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)596 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
597 const struct drm_connector_state *conn_state, u32 level)
598 {
599 struct intel_connector *connector = to_intel_connector(conn_state->connector);
600 struct drm_i915_private *i915 = to_i915(connector->base.dev);
601 struct intel_panel *panel = &connector->panel;
602 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
603 u32 ctl, ctl2, freq;
604
605 ctl2 = intel_de_read(i915, BLC_PWM_CTL2);
606 if (ctl2 & BLM_PWM_ENABLE) {
607 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
608 connector->base.base.id, connector->base.name);
609 ctl2 &= ~BLM_PWM_ENABLE;
610 intel_de_write(i915, BLC_PWM_CTL2, ctl2);
611 }
612
613 freq = panel->backlight.pwm_level_max;
614 if (panel->backlight.combination_mode)
615 freq /= 0xff;
616
617 ctl = freq << 16;
618 intel_de_write(i915, BLC_PWM_CTL, ctl);
619
620 ctl2 = BLM_PIPE(pipe);
621 if (panel->backlight.combination_mode)
622 ctl2 |= BLM_COMBINATION_MODE;
623 if (panel->backlight.active_low_pwm)
624 ctl2 |= BLM_POLARITY_I965;
625 intel_de_write(i915, BLC_PWM_CTL2, ctl2);
626 intel_de_posting_read(i915, BLC_PWM_CTL2);
627 intel_de_write(i915, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
628
629 intel_backlight_set_pwm_level(conn_state, level);
630 }
631
vlv_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)632 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
633 const struct drm_connector_state *conn_state, u32 level)
634 {
635 struct intel_connector *connector = to_intel_connector(conn_state->connector);
636 struct drm_i915_private *i915 = to_i915(connector->base.dev);
637 struct intel_panel *panel = &connector->panel;
638 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
639 u32 ctl, ctl2;
640
641 ctl2 = intel_de_read(i915, VLV_BLC_PWM_CTL2(pipe));
642 if (ctl2 & BLM_PWM_ENABLE) {
643 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
644 connector->base.base.id, connector->base.name);
645 ctl2 &= ~BLM_PWM_ENABLE;
646 intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2);
647 }
648
649 ctl = panel->backlight.pwm_level_max << 16;
650 intel_de_write(i915, VLV_BLC_PWM_CTL(pipe), ctl);
651
652 /* XXX: combine this into above write? */
653 intel_backlight_set_pwm_level(conn_state, level);
654
655 ctl2 = 0;
656 if (panel->backlight.active_low_pwm)
657 ctl2 |= BLM_POLARITY_I965;
658 intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2);
659 intel_de_posting_read(i915, VLV_BLC_PWM_CTL2(pipe));
660 intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
661 }
662
bxt_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)663 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
664 const struct drm_connector_state *conn_state, u32 level)
665 {
666 struct intel_connector *connector = to_intel_connector(conn_state->connector);
667 struct drm_i915_private *i915 = to_i915(connector->base.dev);
668 struct intel_panel *panel = &connector->panel;
669 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
670 u32 pwm_ctl, val;
671
672 /* Controller 1 uses the utility pin. */
673 if (panel->backlight.controller == 1) {
674 val = intel_de_read(i915, UTIL_PIN_CTL);
675 if (val & UTIL_PIN_ENABLE) {
676 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] utility pin already enabled\n",
677 connector->base.base.id, connector->base.name);
678 val &= ~UTIL_PIN_ENABLE;
679 intel_de_write(i915, UTIL_PIN_CTL, val);
680 }
681
682 val = 0;
683 if (panel->backlight.util_pin_active_low)
684 val |= UTIL_PIN_POLARITY;
685 intel_de_write(i915, UTIL_PIN_CTL,
686 val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
687 }
688
689 pwm_ctl = intel_de_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
690 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
691 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
692 connector->base.base.id, connector->base.name);
693 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
694 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
695 pwm_ctl);
696 }
697
698 intel_de_write(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller),
699 panel->backlight.pwm_level_max);
700
701 intel_backlight_set_pwm_level(conn_state, level);
702
703 pwm_ctl = 0;
704 if (panel->backlight.active_low_pwm)
705 pwm_ctl |= BXT_BLC_PWM_POLARITY;
706
707 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
708 intel_de_posting_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
709 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
710 pwm_ctl | BXT_BLC_PWM_ENABLE);
711 }
712
cnp_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)713 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
714 const struct drm_connector_state *conn_state, u32 level)
715 {
716 struct intel_connector *connector = to_intel_connector(conn_state->connector);
717 struct drm_i915_private *i915 = to_i915(connector->base.dev);
718 struct intel_panel *panel = &connector->panel;
719 u32 pwm_ctl;
720
721 pwm_ctl = intel_de_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
722 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
723 drm_dbg_kms(&i915->drm, "backlight already enabled\n");
724 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
725 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
726 pwm_ctl);
727 }
728
729 intel_de_write(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller),
730 panel->backlight.pwm_level_max);
731
732 intel_backlight_set_pwm_level(conn_state, level);
733
734 pwm_ctl = 0;
735 if (panel->backlight.active_low_pwm)
736 pwm_ctl |= BXT_BLC_PWM_POLARITY;
737
738 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
739 intel_de_posting_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
740 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
741 pwm_ctl | BXT_BLC_PWM_ENABLE);
742 }
743
ext_pwm_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)744 static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
745 const struct drm_connector_state *conn_state, u32 level)
746 {
747 struct intel_connector *connector = to_intel_connector(conn_state->connector);
748 struct intel_panel *panel = &connector->panel;
749
750 pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
751 panel->backlight.pwm_state.enabled = true;
752 pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
753 }
754
__intel_backlight_enable(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)755 static void __intel_backlight_enable(const struct intel_crtc_state *crtc_state,
756 const struct drm_connector_state *conn_state)
757 {
758 struct intel_connector *connector = to_intel_connector(conn_state->connector);
759 struct intel_panel *panel = &connector->panel;
760
761 WARN_ON(panel->backlight.max == 0);
762
763 if (panel->backlight.level <= panel->backlight.min) {
764 panel->backlight.level = panel->backlight.max;
765 if (panel->backlight.device)
766 panel->backlight.device->props.brightness =
767 scale_hw_to_user(connector,
768 panel->backlight.level,
769 panel->backlight.device->props.max_brightness);
770 }
771
772 panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);
773 panel->backlight.enabled = true;
774 if (panel->backlight.device)
775 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
776 }
777
intel_backlight_enable(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)778 void intel_backlight_enable(const struct intel_crtc_state *crtc_state,
779 const struct drm_connector_state *conn_state)
780 {
781 struct intel_connector *connector = to_intel_connector(conn_state->connector);
782 struct drm_i915_private *i915 = to_i915(connector->base.dev);
783 struct intel_panel *panel = &connector->panel;
784 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
785
786 if (!panel->backlight.present)
787 return;
788
789 drm_dbg_kms(&i915->drm, "pipe %c\n", pipe_name(pipe));
790
791 mutex_lock(&i915->display.backlight.lock);
792
793 __intel_backlight_enable(crtc_state, conn_state);
794
795 mutex_unlock(&i915->display.backlight.lock);
796 }
797
798 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
intel_panel_get_backlight(struct intel_connector * connector)799 static u32 intel_panel_get_backlight(struct intel_connector *connector)
800 {
801 struct drm_i915_private *i915 = to_i915(connector->base.dev);
802 struct intel_panel *panel = &connector->panel;
803 u32 val = 0;
804
805 mutex_lock(&i915->display.backlight.lock);
806
807 if (panel->backlight.enabled)
808 val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector));
809
810 mutex_unlock(&i915->display.backlight.lock);
811
812 drm_dbg_kms(&i915->drm, "get backlight PWM = %d\n", val);
813 return val;
814 }
815
816 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
scale_user_to_hw(struct intel_connector * connector,u32 user_level,u32 user_max)817 static u32 scale_user_to_hw(struct intel_connector *connector,
818 u32 user_level, u32 user_max)
819 {
820 struct intel_panel *panel = &connector->panel;
821
822 return scale(user_level, 0, user_max,
823 panel->backlight.min, panel->backlight.max);
824 }
825
826 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
intel_panel_set_backlight(const struct drm_connector_state * conn_state,u32 user_level,u32 user_max)827 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
828 u32 user_level, u32 user_max)
829 {
830 struct intel_connector *connector = to_intel_connector(conn_state->connector);
831 struct drm_i915_private *i915 = to_i915(connector->base.dev);
832 struct intel_panel *panel = &connector->panel;
833 u32 hw_level;
834
835 if (!panel->backlight.present)
836 return;
837
838 mutex_lock(&i915->display.backlight.lock);
839
840 drm_WARN_ON(&i915->drm, panel->backlight.max == 0);
841
842 hw_level = scale_user_to_hw(connector, user_level, user_max);
843 panel->backlight.level = hw_level;
844
845 if (panel->backlight.enabled)
846 intel_panel_actually_set_backlight(conn_state, hw_level);
847
848 mutex_unlock(&i915->display.backlight.lock);
849 }
850
intel_backlight_device_update_status(struct backlight_device * bd)851 static int intel_backlight_device_update_status(struct backlight_device *bd)
852 {
853 struct intel_connector *connector = bl_get_data(bd);
854 struct drm_i915_private *i915 = to_i915(connector->base.dev);
855 struct intel_panel *panel = &connector->panel;
856
857 drm_modeset_lock(&i915->drm.mode_config.connection_mutex, NULL);
858
859 drm_dbg_kms(&i915->drm, "updating intel_backlight, brightness=%d/%d\n",
860 bd->props.brightness, bd->props.max_brightness);
861 intel_panel_set_backlight(connector->base.state, bd->props.brightness,
862 bd->props.max_brightness);
863
864 /*
865 * Allow flipping bl_power as a sub-state of enabled. Sadly the
866 * backlight class device does not make it easy to differentiate
867 * between callbacks for brightness and bl_power, so our backlight_power
868 * callback needs to take this into account.
869 */
870 if (panel->backlight.enabled) {
871 if (panel->backlight.power) {
872 bool enable = bd->props.power == FB_BLANK_UNBLANK &&
873 bd->props.brightness != 0;
874 panel->backlight.power(connector, enable);
875 }
876 } else {
877 bd->props.power = FB_BLANK_POWERDOWN;
878 }
879
880 drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
881
882 return 0;
883 }
884
intel_backlight_device_get_brightness(struct backlight_device * bd)885 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
886 {
887 struct intel_connector *connector = bl_get_data(bd);
888 struct drm_i915_private *i915 = to_i915(connector->base.dev);
889 intel_wakeref_t wakeref;
890 int ret = 0;
891
892 with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
893 u32 hw_level;
894
895 drm_modeset_lock(&i915->drm.mode_config.connection_mutex, NULL);
896
897 hw_level = intel_panel_get_backlight(connector);
898 ret = scale_hw_to_user(connector,
899 hw_level, bd->props.max_brightness);
900
901 drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
902 }
903
904 return ret;
905 }
906
907 static const struct backlight_ops intel_backlight_device_ops = {
908 .update_status = intel_backlight_device_update_status,
909 .get_brightness = intel_backlight_device_get_brightness,
910 };
911
intel_backlight_device_register(struct intel_connector * connector)912 int intel_backlight_device_register(struct intel_connector *connector)
913 {
914 struct drm_i915_private *i915 = to_i915(connector->base.dev);
915 struct intel_panel *panel = &connector->panel;
916 struct backlight_properties props;
917 struct backlight_device *bd;
918 const char *name;
919 int ret = 0;
920
921 if (WARN_ON(panel->backlight.device))
922 return -ENODEV;
923
924 if (!panel->backlight.present)
925 return 0;
926
927 WARN_ON(panel->backlight.max == 0);
928
929 if (!acpi_video_backlight_use_native()) {
930 drm_info(&i915->drm, "Skipping intel_backlight registration\n");
931 return 0;
932 }
933
934 memset(&props, 0, sizeof(props));
935 props.type = BACKLIGHT_RAW;
936
937 /*
938 * Note: Everything should work even if the backlight device max
939 * presented to the userspace is arbitrarily chosen.
940 */
941 props.max_brightness = panel->backlight.max;
942 props.brightness = scale_hw_to_user(connector,
943 panel->backlight.level,
944 props.max_brightness);
945
946 if (panel->backlight.enabled)
947 props.power = FB_BLANK_UNBLANK;
948 else
949 props.power = FB_BLANK_POWERDOWN;
950
951 name = kstrdup("intel_backlight", GFP_KERNEL);
952 if (!name)
953 return -ENOMEM;
954
955 bd = backlight_device_get_by_name(name);
956 if (bd) {
957 put_device(&bd->dev);
958 /*
959 * Using the same name independent of the drm device or connector
960 * prevents registration of multiple backlight devices in the
961 * driver. However, we need to use the default name for backward
962 * compatibility. Use unique names for subsequent backlight devices as a
963 * fallback when the default name already exists.
964 */
965 kfree(name);
966 name = kasprintf(GFP_KERNEL, "card%d-%s-backlight",
967 i915->drm.primary->index, connector->base.name);
968 if (!name)
969 return -ENOMEM;
970 }
971 bd = backlight_device_register(name, connector->base.kdev, connector,
972 &intel_backlight_device_ops, &props);
973
974 if (IS_ERR(bd)) {
975 drm_err(&i915->drm,
976 "[CONNECTOR:%d:%s] backlight device %s register failed: %ld\n",
977 connector->base.base.id, connector->base.name, name, PTR_ERR(bd));
978 ret = PTR_ERR(bd);
979 goto out;
980 }
981
982 panel->backlight.device = bd;
983
984 drm_dbg_kms(&i915->drm,
985 "[CONNECTOR:%d:%s] backlight device %s registered\n",
986 connector->base.base.id, connector->base.name, name);
987
988 out:
989 kfree(name);
990
991 return ret;
992 }
993
intel_backlight_device_unregister(struct intel_connector * connector)994 void intel_backlight_device_unregister(struct intel_connector *connector)
995 {
996 struct intel_panel *panel = &connector->panel;
997
998 if (panel->backlight.device) {
999 backlight_device_unregister(panel->backlight.device);
1000 panel->backlight.device = NULL;
1001 }
1002 }
1003 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1004
1005 /*
1006 * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1007 * PWM increment = 1
1008 */
cnp_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1009 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1010 {
1011 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1012
1013 return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(i915)->rawclk_freq),
1014 pwm_freq_hz);
1015 }
1016
1017 /*
1018 * BXT: PWM clock frequency = 19.2 MHz.
1019 */
bxt_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1020 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1021 {
1022 return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1023 }
1024
1025 /*
1026 * SPT: This value represents the period of the PWM stream in clock periods
1027 * multiplied by 16 (default increment) or 128 (alternate increment selected in
1028 * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1029 */
spt_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1030 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1031 {
1032 struct intel_panel *panel = &connector->panel;
1033 u32 mul;
1034
1035 if (panel->backlight.alternate_pwm_increment)
1036 mul = 128;
1037 else
1038 mul = 16;
1039
1040 return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1041 }
1042
1043 /*
1044 * LPT: This value represents the period of the PWM stream in clock periods
1045 * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1046 * LPT SOUTH_CHICKEN2 register bit 5).
1047 */
lpt_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1048 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1049 {
1050 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1051 struct intel_panel *panel = &connector->panel;
1052 u32 mul, clock;
1053
1054 if (panel->backlight.alternate_pwm_increment)
1055 mul = 16;
1056 else
1057 mul = 128;
1058
1059 if (HAS_PCH_LPT_H(i915))
1060 clock = MHz(135); /* LPT:H */
1061 else
1062 clock = MHz(24); /* LPT:LP */
1063
1064 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1065 }
1066
1067 /*
1068 * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1069 * display raw clocks multiplied by 128.
1070 */
pch_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1071 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1072 {
1073 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1074
1075 return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(i915)->rawclk_freq),
1076 pwm_freq_hz * 128);
1077 }
1078
1079 /*
1080 * Gen2: This field determines the number of time base events (display core
1081 * clock frequency/32) in total for a complete cycle of modulated backlight
1082 * control.
1083 *
1084 * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1085 * divided by 32.
1086 */
i9xx_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1087 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1088 {
1089 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1090 int clock;
1091
1092 if (IS_PINEVIEW(i915))
1093 clock = KHz(RUNTIME_INFO(i915)->rawclk_freq);
1094 else
1095 clock = KHz(i915->display.cdclk.hw.cdclk);
1096
1097 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1098 }
1099
1100 /*
1101 * Gen4: This value represents the period of the PWM stream in display core
1102 * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1103 *
1104 */
i965_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1105 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1106 {
1107 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1108 int clock;
1109
1110 if (IS_G4X(i915))
1111 clock = KHz(RUNTIME_INFO(i915)->rawclk_freq);
1112 else
1113 clock = KHz(i915->display.cdclk.hw.cdclk);
1114
1115 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1116 }
1117
1118 /*
1119 * VLV: This value represents the period of the PWM stream in display core
1120 * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1121 * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1122 */
vlv_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1123 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1124 {
1125 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1126 int mul, clock;
1127
1128 if ((intel_de_read(i915, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1129 if (IS_CHERRYVIEW(i915))
1130 clock = KHz(19200);
1131 else
1132 clock = MHz(25);
1133 mul = 16;
1134 } else {
1135 clock = KHz(RUNTIME_INFO(i915)->rawclk_freq);
1136 mul = 128;
1137 }
1138
1139 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1140 }
1141
get_vbt_pwm_freq(struct intel_connector * connector)1142 static u16 get_vbt_pwm_freq(struct intel_connector *connector)
1143 {
1144 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1145 u16 pwm_freq_hz = connector->panel.vbt.backlight.pwm_freq_hz;
1146
1147 if (pwm_freq_hz) {
1148 drm_dbg_kms(&i915->drm,
1149 "VBT defined backlight frequency %u Hz\n",
1150 pwm_freq_hz);
1151 } else {
1152 pwm_freq_hz = 200;
1153 drm_dbg_kms(&i915->drm,
1154 "default backlight frequency %u Hz\n",
1155 pwm_freq_hz);
1156 }
1157
1158 return pwm_freq_hz;
1159 }
1160
get_backlight_max_vbt(struct intel_connector * connector)1161 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1162 {
1163 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1164 struct intel_panel *panel = &connector->panel;
1165 u16 pwm_freq_hz = get_vbt_pwm_freq(connector);
1166 u32 pwm;
1167
1168 if (!panel->backlight.pwm_funcs->hz_to_pwm) {
1169 drm_dbg_kms(&i915->drm,
1170 "backlight frequency conversion not supported\n");
1171 return 0;
1172 }
1173
1174 pwm = panel->backlight.pwm_funcs->hz_to_pwm(connector, pwm_freq_hz);
1175 if (!pwm) {
1176 drm_dbg_kms(&i915->drm,
1177 "backlight frequency conversion failed\n");
1178 return 0;
1179 }
1180
1181 return pwm;
1182 }
1183
1184 /*
1185 * Note: The setup hooks can't assume pipe is set!
1186 */
get_backlight_min_vbt(struct intel_connector * connector)1187 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1188 {
1189 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1190 struct intel_panel *panel = &connector->panel;
1191 int min;
1192
1193 drm_WARN_ON(&i915->drm, panel->backlight.pwm_level_max == 0);
1194
1195 /*
1196 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1197 * to problems. There are such machines out there. Either our
1198 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1199 * against this by letting the minimum be at most (arbitrarily chosen)
1200 * 25% of the max.
1201 */
1202 min = clamp_t(int, connector->panel.vbt.backlight.min_brightness, 0, 64);
1203 if (min != connector->panel.vbt.backlight.min_brightness) {
1204 drm_dbg_kms(&i915->drm,
1205 "clamping VBT min backlight %d/255 to %d/255\n",
1206 connector->panel.vbt.backlight.min_brightness, min);
1207 }
1208
1209 /* vbt value is a coefficient in range [0..255] */
1210 return scale(min, 0, 255, 0, panel->backlight.pwm_level_max);
1211 }
1212
lpt_setup_backlight(struct intel_connector * connector,enum pipe unused)1213 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1214 {
1215 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1216 struct intel_panel *panel = &connector->panel;
1217 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1218 bool alt, cpu_mode;
1219
1220 if (HAS_PCH_LPT(i915))
1221 alt = intel_de_read(i915, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1222 else
1223 alt = intel_de_read(i915, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1224 panel->backlight.alternate_pwm_increment = alt;
1225
1226 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
1227 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1228
1229 pch_ctl2 = intel_de_read(i915, BLC_PWM_PCH_CTL2);
1230 panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1231
1232 cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
1233
1234 if (!panel->backlight.pwm_level_max)
1235 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1236
1237 if (!panel->backlight.pwm_level_max)
1238 return -ENODEV;
1239
1240 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1241
1242 panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1243
1244 cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(i915) &&
1245 !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
1246 (cpu_ctl2 & BLM_PWM_ENABLE);
1247
1248 if (cpu_mode) {
1249 val = pch_get_backlight(connector, unused);
1250
1251 drm_dbg_kms(&i915->drm,
1252 "CPU backlight register was enabled, switching to PCH override\n");
1253
1254 /* Write converted CPU PWM value to PCH override register */
1255 lpt_set_backlight(connector->base.state, val);
1256 intel_de_write(i915, BLC_PWM_PCH_CTL1,
1257 pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
1258
1259 intel_de_write(i915, BLC_PWM_CPU_CTL2,
1260 cpu_ctl2 & ~BLM_PWM_ENABLE);
1261 }
1262
1263 drm_dbg_kms(&i915->drm,
1264 "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control\n",
1265 connector->base.base.id, connector->base.name);
1266
1267 return 0;
1268 }
1269
pch_setup_backlight(struct intel_connector * connector,enum pipe unused)1270 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1271 {
1272 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1273 struct intel_panel *panel = &connector->panel;
1274 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
1275
1276 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
1277 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1278
1279 pch_ctl2 = intel_de_read(i915, BLC_PWM_PCH_CTL2);
1280 panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1281
1282 if (!panel->backlight.pwm_level_max)
1283 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1284
1285 if (!panel->backlight.pwm_level_max)
1286 return -ENODEV;
1287
1288 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1289
1290 cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
1291 panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1292 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1293
1294 drm_dbg_kms(&i915->drm,
1295 "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control\n",
1296 connector->base.base.id, connector->base.name);
1297
1298 return 0;
1299 }
1300
i9xx_setup_backlight(struct intel_connector * connector,enum pipe unused)1301 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1302 {
1303 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1304 struct intel_panel *panel = &connector->panel;
1305 u32 ctl, val;
1306
1307 ctl = intel_de_read(i915, BLC_PWM_CTL);
1308
1309 if (DISPLAY_VER(i915) == 2 || IS_I915GM(i915) || IS_I945GM(i915))
1310 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1311
1312 if (IS_PINEVIEW(i915))
1313 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1314
1315 panel->backlight.pwm_level_max = ctl >> 17;
1316
1317 if (!panel->backlight.pwm_level_max) {
1318 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1319 panel->backlight.pwm_level_max >>= 1;
1320 }
1321
1322 if (!panel->backlight.pwm_level_max)
1323 return -ENODEV;
1324
1325 if (panel->backlight.combination_mode)
1326 panel->backlight.pwm_level_max *= 0xff;
1327
1328 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1329
1330 val = i9xx_get_backlight(connector, unused);
1331 val = intel_backlight_invert_pwm_level(connector, val);
1332 val = clamp(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
1333
1334 panel->backlight.pwm_enabled = val != 0;
1335
1336 drm_dbg_kms(&i915->drm,
1337 "[CONNECTOR:%d:%s] Using native PWM for backlight control\n",
1338 connector->base.base.id, connector->base.name);
1339
1340 return 0;
1341 }
1342
i965_setup_backlight(struct intel_connector * connector,enum pipe unused)1343 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1344 {
1345 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1346 struct intel_panel *panel = &connector->panel;
1347 u32 ctl, ctl2;
1348
1349 ctl2 = intel_de_read(i915, BLC_PWM_CTL2);
1350 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1351 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1352
1353 ctl = intel_de_read(i915, BLC_PWM_CTL);
1354 panel->backlight.pwm_level_max = ctl >> 16;
1355
1356 if (!panel->backlight.pwm_level_max)
1357 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1358
1359 if (!panel->backlight.pwm_level_max)
1360 return -ENODEV;
1361
1362 if (panel->backlight.combination_mode)
1363 panel->backlight.pwm_level_max *= 0xff;
1364
1365 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1366
1367 panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1368
1369 drm_dbg_kms(&i915->drm,
1370 "[CONNECTOR:%d:%s] Using native PWM for backlight control\n",
1371 connector->base.base.id, connector->base.name);
1372
1373 return 0;
1374 }
1375
vlv_setup_backlight(struct intel_connector * connector,enum pipe pipe)1376 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1377 {
1378 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1379 struct intel_panel *panel = &connector->panel;
1380 u32 ctl, ctl2;
1381
1382 if (drm_WARN_ON(&i915->drm, pipe != PIPE_A && pipe != PIPE_B))
1383 return -ENODEV;
1384
1385 ctl2 = intel_de_read(i915, VLV_BLC_PWM_CTL2(pipe));
1386 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1387
1388 ctl = intel_de_read(i915, VLV_BLC_PWM_CTL(pipe));
1389 panel->backlight.pwm_level_max = ctl >> 16;
1390
1391 if (!panel->backlight.pwm_level_max)
1392 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1393
1394 if (!panel->backlight.pwm_level_max)
1395 return -ENODEV;
1396
1397 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1398
1399 panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1400
1401 drm_dbg_kms(&i915->drm,
1402 "[CONNECTOR:%d:%s] Using native PWM for backlight control (on pipe %c)\n",
1403 connector->base.base.id, connector->base.name, pipe_name(pipe));
1404
1405 return 0;
1406 }
1407
1408 static int
bxt_setup_backlight(struct intel_connector * connector,enum pipe unused)1409 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1410 {
1411 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1412 struct intel_panel *panel = &connector->panel;
1413 u32 pwm_ctl, val;
1414
1415 panel->backlight.controller = connector->panel.vbt.backlight.controller;
1416
1417 pwm_ctl = intel_de_read(i915,
1418 BXT_BLC_PWM_CTL(panel->backlight.controller));
1419
1420 /* Controller 1 uses the utility pin. */
1421 if (panel->backlight.controller == 1) {
1422 val = intel_de_read(i915, UTIL_PIN_CTL);
1423 panel->backlight.util_pin_active_low =
1424 val & UTIL_PIN_POLARITY;
1425 }
1426
1427 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1428 panel->backlight.pwm_level_max =
1429 intel_de_read(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1430
1431 if (!panel->backlight.pwm_level_max)
1432 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1433
1434 if (!panel->backlight.pwm_level_max)
1435 return -ENODEV;
1436
1437 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1438
1439 panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1440
1441 drm_dbg_kms(&i915->drm,
1442 "[CONNECTOR:%d:%s] Using native PWM for backlight control (controller=%d)\n",
1443 connector->base.base.id, connector->base.name,
1444 panel->backlight.controller);
1445
1446 return 0;
1447 }
1448
cnp_num_backlight_controllers(struct drm_i915_private * i915)1449 static int cnp_num_backlight_controllers(struct drm_i915_private *i915)
1450 {
1451 if (INTEL_PCH_TYPE(i915) >= PCH_DG1)
1452 return 1;
1453
1454 if (INTEL_PCH_TYPE(i915) >= PCH_ICP)
1455 return 2;
1456
1457 return 1;
1458 }
1459
cnp_backlight_controller_is_valid(struct drm_i915_private * i915,int controller)1460 static bool cnp_backlight_controller_is_valid(struct drm_i915_private *i915, int controller)
1461 {
1462 if (controller < 0 || controller >= cnp_num_backlight_controllers(i915))
1463 return false;
1464
1465 if (controller == 1 &&
1466 INTEL_PCH_TYPE(i915) >= PCH_ICP &&
1467 INTEL_PCH_TYPE(i915) < PCH_MTP)
1468 return intel_de_read(i915, SOUTH_CHICKEN1) & ICP_SECOND_PPS_IO_SELECT;
1469
1470 return true;
1471 }
1472
1473 static int
cnp_setup_backlight(struct intel_connector * connector,enum pipe unused)1474 cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1475 {
1476 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1477 struct intel_panel *panel = &connector->panel;
1478 u32 pwm_ctl;
1479
1480 /*
1481 * CNP has the BXT implementation of backlight, but with only one
1482 * controller. ICP+ can have two controllers, depending on pin muxing.
1483 */
1484 panel->backlight.controller = connector->panel.vbt.backlight.controller;
1485 if (!cnp_backlight_controller_is_valid(i915, panel->backlight.controller)) {
1486 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] Invalid backlight controller %d, assuming 0\n",
1487 connector->base.base.id, connector->base.name,
1488 panel->backlight.controller);
1489 panel->backlight.controller = 0;
1490 }
1491
1492 pwm_ctl = intel_de_read(i915,
1493 BXT_BLC_PWM_CTL(panel->backlight.controller));
1494
1495 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1496 panel->backlight.pwm_level_max =
1497 intel_de_read(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1498
1499 if (!panel->backlight.pwm_level_max)
1500 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1501
1502 if (!panel->backlight.pwm_level_max)
1503 return -ENODEV;
1504
1505 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1506
1507 panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1508
1509 drm_dbg_kms(&i915->drm,
1510 "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control (controller=%d)\n",
1511 connector->base.base.id, connector->base.name,
1512 panel->backlight.controller);
1513
1514 return 0;
1515 }
1516
ext_pwm_setup_backlight(struct intel_connector * connector,enum pipe pipe)1517 static int ext_pwm_setup_backlight(struct intel_connector *connector,
1518 enum pipe pipe)
1519 {
1520 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1521 struct intel_panel *panel = &connector->panel;
1522 const char *desc;
1523 u32 level;
1524
1525 /* Get the right PWM chip for DSI backlight according to VBT */
1526 if (connector->panel.vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
1527 panel->backlight.pwm = pwm_get(i915->drm.dev, "pwm_pmic_backlight");
1528 desc = "PMIC";
1529 } else {
1530 panel->backlight.pwm = pwm_get(i915->drm.dev, "pwm_soc_backlight");
1531 desc = "SoC";
1532 }
1533
1534 if (IS_ERR(panel->backlight.pwm)) {
1535 drm_err(&i915->drm, "[CONNECTOR:%d:%s] Failed to get the %s PWM chip\n",
1536 connector->base.base.id, connector->base.name, desc);
1537 panel->backlight.pwm = NULL;
1538 return -ENODEV;
1539 }
1540
1541 panel->backlight.pwm_level_max = 100; /* 100% */
1542 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1543
1544 if (pwm_is_enabled(panel->backlight.pwm)) {
1545 /* PWM is already enabled, use existing settings */
1546 pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);
1547
1548 level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
1549 100);
1550 level = intel_backlight_invert_pwm_level(connector, level);
1551 panel->backlight.pwm_enabled = true;
1552
1553 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PWM already enabled at freq %ld, VBT freq %d, level %d\n",
1554 connector->base.base.id, connector->base.name,
1555 NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
1556 get_vbt_pwm_freq(connector), level);
1557 } else {
1558 /* Set period from VBT frequency, leave other settings at 0. */
1559 panel->backlight.pwm_state.period =
1560 NSEC_PER_SEC / get_vbt_pwm_freq(connector);
1561 }
1562
1563 drm_dbg_kms(&i915->drm,
1564 "[CONNECTOR:%d:%s] Using %s PWM for backlight control\n",
1565 connector->base.base.id, connector->base.name, desc);
1566
1567 return 0;
1568 }
1569
intel_pwm_set_backlight(const struct drm_connector_state * conn_state,u32 level)1570 static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
1571 {
1572 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1573 struct intel_panel *panel = &connector->panel;
1574
1575 panel->backlight.pwm_funcs->set(conn_state,
1576 intel_backlight_invert_pwm_level(connector, level));
1577 }
1578
intel_pwm_get_backlight(struct intel_connector * connector,enum pipe pipe)1579 static u32 intel_pwm_get_backlight(struct intel_connector *connector, enum pipe pipe)
1580 {
1581 struct intel_panel *panel = &connector->panel;
1582
1583 return intel_backlight_invert_pwm_level(connector,
1584 panel->backlight.pwm_funcs->get(connector, pipe));
1585 }
1586
intel_pwm_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)1587 static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1588 const struct drm_connector_state *conn_state, u32 level)
1589 {
1590 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1591 struct intel_panel *panel = &connector->panel;
1592
1593 panel->backlight.pwm_funcs->enable(crtc_state, conn_state,
1594 intel_backlight_invert_pwm_level(connector, level));
1595 }
1596
intel_pwm_disable_backlight(const struct drm_connector_state * conn_state,u32 level)1597 static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
1598 {
1599 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1600 struct intel_panel *panel = &connector->panel;
1601
1602 panel->backlight.pwm_funcs->disable(conn_state,
1603 intel_backlight_invert_pwm_level(connector, level));
1604 }
1605
intel_pwm_setup_backlight(struct intel_connector * connector,enum pipe pipe)1606 static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1607 {
1608 struct intel_panel *panel = &connector->panel;
1609 int ret;
1610
1611 ret = panel->backlight.pwm_funcs->setup(connector, pipe);
1612 if (ret < 0)
1613 return ret;
1614
1615 panel->backlight.min = panel->backlight.pwm_level_min;
1616 panel->backlight.max = panel->backlight.pwm_level_max;
1617 panel->backlight.level = intel_pwm_get_backlight(connector, pipe);
1618 panel->backlight.enabled = panel->backlight.pwm_enabled;
1619
1620 return 0;
1621 }
1622
intel_backlight_update(struct intel_atomic_state * state,struct intel_encoder * encoder,const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)1623 void intel_backlight_update(struct intel_atomic_state *state,
1624 struct intel_encoder *encoder,
1625 const struct intel_crtc_state *crtc_state,
1626 const struct drm_connector_state *conn_state)
1627 {
1628 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1629 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1630 struct intel_panel *panel = &connector->panel;
1631
1632 if (!panel->backlight.present)
1633 return;
1634
1635 mutex_lock(&i915->display.backlight.lock);
1636 if (!panel->backlight.enabled)
1637 __intel_backlight_enable(crtc_state, conn_state);
1638
1639 mutex_unlock(&i915->display.backlight.lock);
1640 }
1641
intel_backlight_setup(struct intel_connector * connector,enum pipe pipe)1642 int intel_backlight_setup(struct intel_connector *connector, enum pipe pipe)
1643 {
1644 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1645 struct intel_panel *panel = &connector->panel;
1646 int ret;
1647
1648 if (!connector->panel.vbt.backlight.present) {
1649 if (intel_has_quirk(i915, QUIRK_BACKLIGHT_PRESENT)) {
1650 drm_dbg_kms(&i915->drm,
1651 "[CONNECTOR:%d:%s] no backlight present per VBT, but present per quirk\n",
1652 connector->base.base.id, connector->base.name);
1653 } else {
1654 drm_dbg_kms(&i915->drm,
1655 "[CONNECTOR:%d:%s] no backlight present per VBT\n",
1656 connector->base.base.id, connector->base.name);
1657 return 0;
1658 }
1659 }
1660
1661 /* ensure intel_panel has been initialized first */
1662 if (drm_WARN_ON(&i915->drm, !panel->backlight.funcs))
1663 return -ENODEV;
1664
1665 /* set level and max in panel struct */
1666 mutex_lock(&i915->display.backlight.lock);
1667 ret = panel->backlight.funcs->setup(connector, pipe);
1668 mutex_unlock(&i915->display.backlight.lock);
1669
1670 if (ret) {
1671 drm_dbg_kms(&i915->drm,
1672 "[CONNECTOR:%d:%s] failed to setup backlight\n",
1673 connector->base.base.id, connector->base.name);
1674 return ret;
1675 }
1676
1677 panel->backlight.present = true;
1678
1679 drm_dbg_kms(&i915->drm,
1680 "[CONNECTOR:%d:%s] backlight initialized, %s, brightness %u/%u\n",
1681 connector->base.base.id, connector->base.name,
1682 str_enabled_disabled(panel->backlight.enabled),
1683 panel->backlight.level, panel->backlight.max);
1684
1685 return 0;
1686 }
1687
intel_backlight_destroy(struct intel_panel * panel)1688 void intel_backlight_destroy(struct intel_panel *panel)
1689 {
1690 /* dispose of the pwm */
1691 if (panel->backlight.pwm)
1692 pwm_put(panel->backlight.pwm);
1693
1694 panel->backlight.present = false;
1695 }
1696
1697 static const struct intel_panel_bl_funcs bxt_pwm_funcs = {
1698 .setup = bxt_setup_backlight,
1699 .enable = bxt_enable_backlight,
1700 .disable = bxt_disable_backlight,
1701 .set = bxt_set_backlight,
1702 .get = bxt_get_backlight,
1703 .hz_to_pwm = bxt_hz_to_pwm,
1704 };
1705
1706 static const struct intel_panel_bl_funcs cnp_pwm_funcs = {
1707 .setup = cnp_setup_backlight,
1708 .enable = cnp_enable_backlight,
1709 .disable = cnp_disable_backlight,
1710 .set = bxt_set_backlight,
1711 .get = bxt_get_backlight,
1712 .hz_to_pwm = cnp_hz_to_pwm,
1713 };
1714
1715 static const struct intel_panel_bl_funcs lpt_pwm_funcs = {
1716 .setup = lpt_setup_backlight,
1717 .enable = lpt_enable_backlight,
1718 .disable = lpt_disable_backlight,
1719 .set = lpt_set_backlight,
1720 .get = lpt_get_backlight,
1721 .hz_to_pwm = lpt_hz_to_pwm,
1722 };
1723
1724 static const struct intel_panel_bl_funcs spt_pwm_funcs = {
1725 .setup = lpt_setup_backlight,
1726 .enable = lpt_enable_backlight,
1727 .disable = lpt_disable_backlight,
1728 .set = lpt_set_backlight,
1729 .get = lpt_get_backlight,
1730 .hz_to_pwm = spt_hz_to_pwm,
1731 };
1732
1733 static const struct intel_panel_bl_funcs pch_pwm_funcs = {
1734 .setup = pch_setup_backlight,
1735 .enable = pch_enable_backlight,
1736 .disable = pch_disable_backlight,
1737 .set = pch_set_backlight,
1738 .get = pch_get_backlight,
1739 .hz_to_pwm = pch_hz_to_pwm,
1740 };
1741
1742 static const struct intel_panel_bl_funcs ext_pwm_funcs = {
1743 .setup = ext_pwm_setup_backlight,
1744 .enable = ext_pwm_enable_backlight,
1745 .disable = ext_pwm_disable_backlight,
1746 .set = ext_pwm_set_backlight,
1747 .get = ext_pwm_get_backlight,
1748 };
1749
1750 static const struct intel_panel_bl_funcs vlv_pwm_funcs = {
1751 .setup = vlv_setup_backlight,
1752 .enable = vlv_enable_backlight,
1753 .disable = vlv_disable_backlight,
1754 .set = vlv_set_backlight,
1755 .get = vlv_get_backlight,
1756 .hz_to_pwm = vlv_hz_to_pwm,
1757 };
1758
1759 static const struct intel_panel_bl_funcs i965_pwm_funcs = {
1760 .setup = i965_setup_backlight,
1761 .enable = i965_enable_backlight,
1762 .disable = i965_disable_backlight,
1763 .set = i9xx_set_backlight,
1764 .get = i9xx_get_backlight,
1765 .hz_to_pwm = i965_hz_to_pwm,
1766 };
1767
1768 static const struct intel_panel_bl_funcs i9xx_pwm_funcs = {
1769 .setup = i9xx_setup_backlight,
1770 .enable = i9xx_enable_backlight,
1771 .disable = i9xx_disable_backlight,
1772 .set = i9xx_set_backlight,
1773 .get = i9xx_get_backlight,
1774 .hz_to_pwm = i9xx_hz_to_pwm,
1775 };
1776
1777 static const struct intel_panel_bl_funcs pwm_bl_funcs = {
1778 .setup = intel_pwm_setup_backlight,
1779 .enable = intel_pwm_enable_backlight,
1780 .disable = intel_pwm_disable_backlight,
1781 .set = intel_pwm_set_backlight,
1782 .get = intel_pwm_get_backlight,
1783 };
1784
1785 /* Set up chip specific backlight functions */
intel_backlight_init_funcs(struct intel_panel * panel)1786 void intel_backlight_init_funcs(struct intel_panel *panel)
1787 {
1788 struct intel_connector *connector =
1789 container_of(panel, struct intel_connector, panel);
1790 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1791
1792 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1793 intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1794 return;
1795
1796 if (IS_GEMINILAKE(i915) || IS_BROXTON(i915)) {
1797 panel->backlight.pwm_funcs = &bxt_pwm_funcs;
1798 } else if (INTEL_PCH_TYPE(i915) >= PCH_CNP) {
1799 panel->backlight.pwm_funcs = &cnp_pwm_funcs;
1800 } else if (INTEL_PCH_TYPE(i915) >= PCH_LPT) {
1801 if (HAS_PCH_LPT(i915))
1802 panel->backlight.pwm_funcs = &lpt_pwm_funcs;
1803 else
1804 panel->backlight.pwm_funcs = &spt_pwm_funcs;
1805 } else if (HAS_PCH_SPLIT(i915)) {
1806 panel->backlight.pwm_funcs = &pch_pwm_funcs;
1807 } else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
1808 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1809 panel->backlight.pwm_funcs = &ext_pwm_funcs;
1810 } else {
1811 panel->backlight.pwm_funcs = &vlv_pwm_funcs;
1812 }
1813 } else if (DISPLAY_VER(i915) == 4) {
1814 panel->backlight.pwm_funcs = &i965_pwm_funcs;
1815 } else {
1816 panel->backlight.pwm_funcs = &i9xx_pwm_funcs;
1817 }
1818
1819 if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) {
1820 if (intel_dp_aux_init_backlight_funcs(connector) == 0)
1821 return;
1822
1823 if (!intel_has_quirk(i915, QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK))
1824 connector->panel.backlight.power = intel_pps_backlight_power;
1825 }
1826
1827 /* We're using a standard PWM backlight interface */
1828 panel->backlight.funcs = &pwm_bl_funcs;
1829 }
1830