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1 : : /*
2 : : * Copyright © 2006-2010 Intel Corporation
3 : : * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
4 : : *
5 : : * Permission is hereby granted, free of charge, to any person obtaining a
6 : : * copy of this software and associated documentation files (the "Software"),
7 : : * to deal in the Software without restriction, including without limitation
8 : : * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 : : * and/or sell copies of the Software, and to permit persons to whom the
10 : : * Software is furnished to do so, subject to the following conditions:
11 : : *
12 : : * The above copyright notice and this permission notice (including the next
13 : : * paragraph) shall be included in all copies or substantial portions of the
14 : : * Software.
15 : : *
16 : : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 : : * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 : : * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 : : * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 : : * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 : : * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 : : * DEALINGS IN THE SOFTWARE.
23 : : *
24 : : * Authors:
25 : : * Eric Anholt <eric@anholt.net>
26 : : * Dave Airlie <airlied@linux.ie>
27 : : * Jesse Barnes <jesse.barnes@intel.com>
28 : : * Chris Wilson <chris@chris-wilson.co.uk>
29 : : */
30 : :
31 : : #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32 : :
33 : : #include <linux/kernel.h>
34 : : #include <linux/moduleparam.h>
35 : : #include <linux/pwm.h>
36 : :
37 : : #include "intel_connector.h"
38 : : #include "intel_display_types.h"
39 : : #include "intel_dp_aux_backlight.h"
40 : : #include "intel_dsi_dcs_backlight.h"
41 : : #include "intel_panel.h"
42 : :
43 : : #define CRC_PMIC_PWM_PERIOD_NS 21333
44 : :
45 : : void
46 : 0 : intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
47 : : struct drm_display_mode *adjusted_mode)
48 : : {
49 : 0 : drm_mode_copy(adjusted_mode, fixed_mode);
50 : :
51 : 0 : drm_mode_set_crtcinfo(adjusted_mode, 0);
52 : 0 : }
53 : :
54 : 0 : static bool is_downclock_mode(const struct drm_display_mode *downclock_mode,
55 : : const struct drm_display_mode *fixed_mode)
56 : : {
57 : 0 : return drm_mode_match(downclock_mode, fixed_mode,
58 : : DRM_MODE_MATCH_TIMINGS |
59 : : DRM_MODE_MATCH_FLAGS |
60 [ # # ]: 0 : DRM_MODE_MATCH_3D_FLAGS) &&
61 [ # # ]: 0 : downclock_mode->clock < fixed_mode->clock;
62 : : }
63 : :
64 : : struct drm_display_mode *
65 : 0 : intel_panel_edid_downclock_mode(struct intel_connector *connector,
66 : : const struct drm_display_mode *fixed_mode)
67 : : {
68 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
69 : 0 : const struct drm_display_mode *scan, *best_mode = NULL;
70 : 0 : struct drm_display_mode *downclock_mode;
71 : 0 : int best_clock = fixed_mode->clock;
72 : :
73 [ # # ]: 0 : list_for_each_entry(scan, &connector->base.probed_modes, head) {
74 : : /*
75 : : * If one mode has the same resolution with the fixed_panel
76 : : * mode while they have the different refresh rate, it means
77 : : * that the reduced downclock is found. In such
78 : : * case we can set the different FPx0/1 to dynamically select
79 : : * between low and high frequency.
80 : : */
81 [ # # ]: 0 : if (is_downclock_mode(scan, fixed_mode) &&
82 [ # # ]: 0 : scan->clock < best_clock) {
83 : : /*
84 : : * The downclock is already found. But we
85 : : * expect to find the lower downclock.
86 : : */
87 : 0 : best_clock = scan->clock;
88 : 0 : best_mode = scan;
89 : : }
90 : : }
91 : :
92 [ # # ]: 0 : if (!best_mode)
93 : : return NULL;
94 : :
95 : 0 : downclock_mode = drm_mode_duplicate(&dev_priv->drm, best_mode);
96 [ # # ]: 0 : if (!downclock_mode)
97 : : return NULL;
98 : :
99 : 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using downclock mode from EDID: ",
100 : : connector->base.base.id, connector->base.name);
101 : 0 : drm_mode_debug_printmodeline(downclock_mode);
102 : :
103 : 0 : return downclock_mode;
104 : : }
105 : :
106 : : struct drm_display_mode *
107 : 0 : intel_panel_edid_fixed_mode(struct intel_connector *connector)
108 : : {
109 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
110 : 0 : const struct drm_display_mode *scan;
111 : 0 : struct drm_display_mode *fixed_mode;
112 : :
113 [ # # ]: 0 : if (list_empty(&connector->base.probed_modes))
114 : : return NULL;
115 : :
116 : : /* prefer fixed mode from EDID if available */
117 [ # # ]: 0 : list_for_each_entry(scan, &connector->base.probed_modes, head) {
118 [ # # ]: 0 : if ((scan->type & DRM_MODE_TYPE_PREFERRED) == 0)
119 : 0 : continue;
120 : :
121 : 0 : fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
122 [ # # ]: 0 : if (!fixed_mode)
123 : : return NULL;
124 : :
125 : 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using preferred mode from EDID: ",
126 : : connector->base.base.id, connector->base.name);
127 : 0 : drm_mode_debug_printmodeline(fixed_mode);
128 : :
129 : 0 : return fixed_mode;
130 : : }
131 : :
132 : 0 : scan = list_first_entry(&connector->base.probed_modes,
133 : : typeof(*scan), head);
134 : :
135 : 0 : fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
136 [ # # ]: 0 : if (!fixed_mode)
137 : : return NULL;
138 : :
139 : 0 : fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
140 : :
141 : 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using first mode from EDID: ",
142 : : connector->base.base.id, connector->base.name);
143 : 0 : drm_mode_debug_printmodeline(fixed_mode);
144 : :
145 : 0 : return fixed_mode;
146 : : }
147 : :
148 : : struct drm_display_mode *
149 : 0 : intel_panel_vbt_fixed_mode(struct intel_connector *connector)
150 : : {
151 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
152 : 0 : struct drm_display_info *info = &connector->base.display_info;
153 : 0 : struct drm_display_mode *fixed_mode;
154 : :
155 [ # # ]: 0 : if (!dev_priv->vbt.lfp_lvds_vbt_mode)
156 : : return NULL;
157 : :
158 : 0 : fixed_mode = drm_mode_duplicate(&dev_priv->drm,
159 : : dev_priv->vbt.lfp_lvds_vbt_mode);
160 [ # # ]: 0 : if (!fixed_mode)
161 : : return NULL;
162 : :
163 : 0 : fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
164 : :
165 : 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using mode from VBT: ",
166 : : connector->base.base.id, connector->base.name);
167 : 0 : drm_mode_debug_printmodeline(fixed_mode);
168 : :
169 : 0 : info->width_mm = fixed_mode->width_mm;
170 : 0 : info->height_mm = fixed_mode->height_mm;
171 : :
172 : 0 : return fixed_mode;
173 : : }
174 : :
175 : : /* adjusted_mode has been preset to be the panel's fixed mode */
176 : : void
177 : 0 : intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
178 : : struct intel_crtc_state *pipe_config,
179 : : int fitting_mode)
180 : : {
181 : 0 : const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
182 : 0 : int x = 0, y = 0, width = 0, height = 0;
183 : :
184 : : /* Native modes don't need fitting */
185 [ # # ]: 0 : if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
186 [ # # ]: 0 : adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h &&
187 [ # # ]: 0 : pipe_config->output_format != INTEL_OUTPUT_FORMAT_YCBCR420)
188 : 0 : goto done;
189 : :
190 [ # # # # ]: 0 : switch (fitting_mode) {
191 : 0 : case DRM_MODE_SCALE_CENTER:
192 : 0 : width = pipe_config->pipe_src_w;
193 : 0 : height = pipe_config->pipe_src_h;
194 : 0 : x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
195 : 0 : y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
196 : 0 : break;
197 : :
198 : 0 : case DRM_MODE_SCALE_ASPECT:
199 : : /* Scale but preserve the aspect ratio */
200 : : {
201 : 0 : u32 scaled_width = adjusted_mode->crtc_hdisplay
202 : 0 : * pipe_config->pipe_src_h;
203 : 0 : u32 scaled_height = pipe_config->pipe_src_w
204 : 0 : * adjusted_mode->crtc_vdisplay;
205 [ # # ]: 0 : if (scaled_width > scaled_height) { /* pillar */
206 : 0 : width = scaled_height / pipe_config->pipe_src_h;
207 [ # # ]: 0 : if (width & 1)
208 : 0 : width++;
209 : 0 : x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
210 : 0 : y = 0;
211 : 0 : height = adjusted_mode->crtc_vdisplay;
212 [ # # ]: 0 : } else if (scaled_width < scaled_height) { /* letter */
213 : 0 : height = scaled_width / pipe_config->pipe_src_w;
214 [ # # ]: 0 : if (height & 1)
215 : 0 : height++;
216 : 0 : y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
217 : 0 : x = 0;
218 : 0 : width = adjusted_mode->crtc_hdisplay;
219 : : } else {
220 : : x = y = 0;
221 : : width = adjusted_mode->crtc_hdisplay;
222 : : height = adjusted_mode->crtc_vdisplay;
223 : : }
224 : : }
225 : : break;
226 : :
227 : 0 : case DRM_MODE_SCALE_FULLSCREEN:
228 : 0 : x = y = 0;
229 : 0 : width = adjusted_mode->crtc_hdisplay;
230 : 0 : height = adjusted_mode->crtc_vdisplay;
231 : 0 : break;
232 : :
233 : : default:
234 : 0 : WARN(1, "bad panel fit mode: %d\n", fitting_mode);
235 : 0 : return;
236 : : }
237 : :
238 : 0 : done:
239 : 0 : pipe_config->pch_pfit.pos = (x << 16) | y;
240 : 0 : pipe_config->pch_pfit.size = (width << 16) | height;
241 : 0 : pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
242 : : }
243 : :
244 : : static void
245 : 0 : centre_horizontally(struct drm_display_mode *adjusted_mode,
246 : : int width)
247 : : {
248 : 0 : u32 border, sync_pos, blank_width, sync_width;
249 : :
250 : : /* keep the hsync and hblank widths constant */
251 : 0 : sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
252 : 0 : blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
253 : 0 : sync_pos = (blank_width - sync_width + 1) / 2;
254 : :
255 : 0 : border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
256 : 0 : border += border & 1; /* make the border even */
257 : :
258 : 0 : adjusted_mode->crtc_hdisplay = width;
259 : 0 : adjusted_mode->crtc_hblank_start = width + border;
260 : 0 : adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
261 : :
262 : 0 : adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
263 : 0 : adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
264 : 0 : }
265 : :
266 : : static void
267 : 0 : centre_vertically(struct drm_display_mode *adjusted_mode,
268 : : int height)
269 : : {
270 : 0 : u32 border, sync_pos, blank_width, sync_width;
271 : :
272 : : /* keep the vsync and vblank widths constant */
273 : 0 : sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
274 : 0 : blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
275 : 0 : sync_pos = (blank_width - sync_width + 1) / 2;
276 : :
277 : 0 : border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
278 : :
279 : 0 : adjusted_mode->crtc_vdisplay = height;
280 : 0 : adjusted_mode->crtc_vblank_start = height + border;
281 : 0 : adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
282 : :
283 : 0 : adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
284 : 0 : adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
285 : : }
286 : :
287 : 0 : static inline u32 panel_fitter_scaling(u32 source, u32 target)
288 : : {
289 : : /*
290 : : * Floating point operation is not supported. So the FACTOR
291 : : * is defined, which can avoid the floating point computation
292 : : * when calculating the panel ratio.
293 : : */
294 : : #define ACCURACY 12
295 : : #define FACTOR (1 << ACCURACY)
296 : 0 : u32 ratio = source * FACTOR / target;
297 : 0 : return (FACTOR * ratio + FACTOR/2) / FACTOR;
298 : : }
299 : :
300 : 0 : static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
301 : : u32 *pfit_control)
302 : : {
303 : 0 : const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
304 : 0 : u32 scaled_width = adjusted_mode->crtc_hdisplay *
305 : 0 : pipe_config->pipe_src_h;
306 : 0 : u32 scaled_height = pipe_config->pipe_src_w *
307 : 0 : adjusted_mode->crtc_vdisplay;
308 : :
309 : : /* 965+ is easy, it does everything in hw */
310 : 0 : if (scaled_width > scaled_height)
311 : 0 : *pfit_control |= PFIT_ENABLE |
312 : : PFIT_SCALING_PILLAR;
313 [ # # ]: 0 : else if (scaled_width < scaled_height)
314 : 0 : *pfit_control |= PFIT_ENABLE |
315 : : PFIT_SCALING_LETTER;
316 [ # # ]: 0 : else if (adjusted_mode->crtc_hdisplay != pipe_config->pipe_src_w)
317 : 0 : *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
318 : : }
319 : :
320 : 0 : static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
321 : : u32 *pfit_control, u32 *pfit_pgm_ratios,
322 : : u32 *border)
323 : : {
324 : 0 : struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
325 : 0 : u32 scaled_width = adjusted_mode->crtc_hdisplay *
326 : 0 : pipe_config->pipe_src_h;
327 : 0 : u32 scaled_height = pipe_config->pipe_src_w *
328 : 0 : adjusted_mode->crtc_vdisplay;
329 : 0 : u32 bits;
330 : :
331 : : /*
332 : : * For earlier chips we have to calculate the scaling
333 : : * ratio by hand and program it into the
334 : : * PFIT_PGM_RATIO register
335 : : */
336 [ # # ]: 0 : if (scaled_width > scaled_height) { /* pillar */
337 : 0 : centre_horizontally(adjusted_mode,
338 : 0 : scaled_height /
339 : 0 : pipe_config->pipe_src_h);
340 : :
341 : 0 : *border = LVDS_BORDER_ENABLE;
342 [ # # ]: 0 : if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay) {
343 : 0 : bits = panel_fitter_scaling(pipe_config->pipe_src_h,
344 : : adjusted_mode->crtc_vdisplay);
345 : :
346 : 0 : *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
347 : 0 : bits << PFIT_VERT_SCALE_SHIFT);
348 : 0 : *pfit_control |= (PFIT_ENABLE |
349 : : VERT_INTERP_BILINEAR |
350 : : HORIZ_INTERP_BILINEAR);
351 : : }
352 [ # # ]: 0 : } else if (scaled_width < scaled_height) { /* letter */
353 : 0 : centre_vertically(adjusted_mode,
354 : 0 : scaled_width /
355 : 0 : pipe_config->pipe_src_w);
356 : :
357 : 0 : *border = LVDS_BORDER_ENABLE;
358 [ # # ]: 0 : if (pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
359 : 0 : bits = panel_fitter_scaling(pipe_config->pipe_src_w,
360 : : adjusted_mode->crtc_hdisplay);
361 : :
362 : 0 : *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
363 : 0 : bits << PFIT_VERT_SCALE_SHIFT);
364 : 0 : *pfit_control |= (PFIT_ENABLE |
365 : : VERT_INTERP_BILINEAR |
366 : : HORIZ_INTERP_BILINEAR);
367 : : }
368 : : } else {
369 : : /* Aspects match, Let hw scale both directions */
370 : 0 : *pfit_control |= (PFIT_ENABLE |
371 : : VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
372 : : VERT_INTERP_BILINEAR |
373 : : HORIZ_INTERP_BILINEAR);
374 : : }
375 : 0 : }
376 : :
377 : 0 : void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
378 : : struct intel_crtc_state *pipe_config,
379 : : int fitting_mode)
380 : : {
381 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
382 : 0 : u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
383 : 0 : struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
384 : :
385 : : /* Native modes don't need fitting */
386 [ # # ]: 0 : if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
387 [ # # ]: 0 : adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
388 : 0 : goto out;
389 : :
390 [ # # # # ]: 0 : switch (fitting_mode) {
391 : 0 : case DRM_MODE_SCALE_CENTER:
392 : : /*
393 : : * For centered modes, we have to calculate border widths &
394 : : * heights and modify the values programmed into the CRTC.
395 : : */
396 : 0 : centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
397 : 0 : centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
398 : 0 : border = LVDS_BORDER_ENABLE;
399 : 0 : break;
400 : 0 : case DRM_MODE_SCALE_ASPECT:
401 : : /* Scale but preserve the aspect ratio */
402 [ # # ]: 0 : if (INTEL_GEN(dev_priv) >= 4)
403 [ # # ]: 0 : i965_scale_aspect(pipe_config, &pfit_control);
404 : : else
405 : 0 : i9xx_scale_aspect(pipe_config, &pfit_control,
406 : : &pfit_pgm_ratios, &border);
407 : : break;
408 : 0 : case DRM_MODE_SCALE_FULLSCREEN:
409 : : /*
410 : : * Full scaling, even if it changes the aspect ratio.
411 : : * Fortunately this is all done for us in hw.
412 : : */
413 [ # # # # ]: 0 : if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
414 : : pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
415 : 0 : pfit_control |= PFIT_ENABLE;
416 [ # # ]: 0 : if (INTEL_GEN(dev_priv) >= 4)
417 : : pfit_control |= PFIT_SCALING_AUTO;
418 : : else
419 : 0 : pfit_control |= (VERT_AUTO_SCALE |
420 : : VERT_INTERP_BILINEAR |
421 : : HORIZ_AUTO_SCALE |
422 : : HORIZ_INTERP_BILINEAR);
423 : : }
424 : : break;
425 : : default:
426 : 0 : WARN(1, "bad panel fit mode: %d\n", fitting_mode);
427 : 0 : return;
428 : : }
429 : :
430 : : /* 965+ wants fuzzy fitting */
431 : : /* FIXME: handle multiple panels by failing gracefully */
432 [ # # ]: 0 : if (INTEL_GEN(dev_priv) >= 4)
433 : 0 : pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
434 : : PFIT_FILTER_FUZZY);
435 : :
436 : 0 : out:
437 [ # # ]: 0 : if ((pfit_control & PFIT_ENABLE) == 0) {
438 : 0 : pfit_control = 0;
439 : 0 : pfit_pgm_ratios = 0;
440 : : }
441 : :
442 : : /* Make sure pre-965 set dither correctly for 18bpp panels. */
443 [ # # # # ]: 0 : if (INTEL_GEN(dev_priv) < 4 && pipe_config->pipe_bpp == 18)
444 : 0 : pfit_control |= PANEL_8TO6_DITHER_ENABLE;
445 : :
446 : 0 : pipe_config->gmch_pfit.control = pfit_control;
447 : 0 : pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
448 : 0 : pipe_config->gmch_pfit.lvds_border_bits = border;
449 : : }
450 : :
451 : : /**
452 : : * scale - scale values from one range to another
453 : : * @source_val: value in range [@source_min..@source_max]
454 : : * @source_min: minimum legal value for @source_val
455 : : * @source_max: maximum legal value for @source_val
456 : : * @target_min: corresponding target value for @source_min
457 : : * @target_max: corresponding target value for @source_max
458 : : *
459 : : * Return @source_val in range [@source_min..@source_max] scaled to range
460 : : * [@target_min..@target_max].
461 : : */
462 : 0 : static u32 scale(u32 source_val,
463 : : u32 source_min, u32 source_max,
464 : : u32 target_min, u32 target_max)
465 : : {
466 : 0 : u64 target_val;
467 : :
468 [ # # ]: 0 : WARN_ON(source_min > source_max);
469 [ # # ]: 0 : WARN_ON(target_min > target_max);
470 : :
471 : : /* defensive */
472 : 0 : source_val = clamp(source_val, source_min, source_max);
473 : :
474 : : /* avoid overflows */
475 : 0 : target_val = mul_u32_u32(source_val - source_min,
476 : : target_max - target_min);
477 : 0 : target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
478 : 0 : target_val += target_min;
479 : :
480 : 0 : return target_val;
481 : : }
482 : :
483 : : /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
484 : 0 : static inline u32 scale_user_to_hw(struct intel_connector *connector,
485 : : u32 user_level, u32 user_max)
486 : : {
487 : 0 : struct intel_panel *panel = &connector->panel;
488 : :
489 : 0 : return scale(user_level, 0, user_max,
490 : : panel->backlight.min, panel->backlight.max);
491 : : }
492 : :
493 : : /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
494 : : * to [hw_min..hw_max]. */
495 : 0 : static inline u32 clamp_user_to_hw(struct intel_connector *connector,
496 : : u32 user_level, u32 user_max)
497 : : {
498 : 0 : struct intel_panel *panel = &connector->panel;
499 : 0 : u32 hw_level;
500 : :
501 : 0 : hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
502 : 0 : hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
503 : :
504 : 0 : return hw_level;
505 : : }
506 : :
507 : : /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
508 : 0 : static inline u32 scale_hw_to_user(struct intel_connector *connector,
509 : : u32 hw_level, u32 user_max)
510 : : {
511 : 0 : struct intel_panel *panel = &connector->panel;
512 : :
513 : 0 : return scale(hw_level, panel->backlight.min, panel->backlight.max,
514 : : 0, user_max);
515 : : }
516 : :
517 : 0 : static u32 intel_panel_compute_brightness(struct intel_connector *connector,
518 : : u32 val)
519 : : {
520 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
521 : 0 : struct intel_panel *panel = &connector->panel;
522 : :
523 [ # # ]: 0 : WARN_ON(panel->backlight.max == 0);
524 : :
525 [ # # ]: 0 : if (i915_modparams.invert_brightness < 0)
526 : : return val;
527 : :
528 [ # # ]: 0 : if (i915_modparams.invert_brightness > 0 ||
529 [ # # ]: 0 : dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
530 : 0 : return panel->backlight.max - val + panel->backlight.min;
531 : : }
532 : :
533 : : return val;
534 : : }
535 : :
536 : 0 : static u32 lpt_get_backlight(struct intel_connector *connector)
537 : : {
538 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
539 : :
540 : 0 : return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
541 : : }
542 : :
543 : 0 : static u32 pch_get_backlight(struct intel_connector *connector)
544 : : {
545 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
546 : :
547 : 0 : return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
548 : : }
549 : :
550 : 0 : static u32 i9xx_get_backlight(struct intel_connector *connector)
551 : : {
552 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
553 : 0 : struct intel_panel *panel = &connector->panel;
554 : 0 : u32 val;
555 : :
556 : 0 : val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
557 [ # # ]: 0 : if (INTEL_GEN(dev_priv) < 4)
558 : 0 : val >>= 1;
559 : :
560 [ # # ]: 0 : if (panel->backlight.combination_mode) {
561 : 0 : u8 lbpc;
562 : :
563 : 0 : pci_read_config_byte(dev_priv->drm.pdev, LBPC, &lbpc);
564 : 0 : val *= lbpc;
565 : : }
566 : :
567 : 0 : return val;
568 : : }
569 : :
570 : 0 : static u32 _vlv_get_backlight(struct drm_i915_private *dev_priv, enum pipe pipe)
571 : : {
572 [ # # # # ]: 0 : if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
573 : : return 0;
574 : :
575 : 0 : return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
576 : : }
577 : :
578 : 0 : static u32 vlv_get_backlight(struct intel_connector *connector)
579 : : {
580 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
581 : 0 : enum pipe pipe = intel_connector_get_pipe(connector);
582 : :
583 : 0 : return _vlv_get_backlight(dev_priv, pipe);
584 : : }
585 : :
586 : 0 : static u32 bxt_get_backlight(struct intel_connector *connector)
587 : : {
588 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
589 : 0 : struct intel_panel *panel = &connector->panel;
590 : :
591 : 0 : return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
592 : : }
593 : :
594 : 0 : static u32 pwm_get_backlight(struct intel_connector *connector)
595 : : {
596 : 0 : struct intel_panel *panel = &connector->panel;
597 : 0 : int duty_ns;
598 : :
599 : 0 : duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
600 : 0 : return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
601 : : }
602 : :
603 : 0 : static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
604 : : {
605 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
606 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
607 : :
608 : 0 : u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
609 : 0 : I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
610 : 0 : }
611 : :
612 : 0 : static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
613 : : {
614 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
615 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
616 : 0 : u32 tmp;
617 : :
618 : 0 : tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
619 : 0 : I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
620 : 0 : }
621 : :
622 : 0 : static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
623 : : {
624 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
625 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
626 : 0 : struct intel_panel *panel = &connector->panel;
627 : 0 : u32 tmp, mask;
628 : :
629 [ # # ]: 0 : WARN_ON(panel->backlight.max == 0);
630 : :
631 [ # # ]: 0 : if (panel->backlight.combination_mode) {
632 : 0 : u8 lbpc;
633 : :
634 : 0 : lbpc = level * 0xfe / panel->backlight.max + 1;
635 : 0 : level /= lbpc;
636 : 0 : pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
637 : : }
638 : :
639 [ # # ]: 0 : if (IS_GEN(dev_priv, 4)) {
640 : : mask = BACKLIGHT_DUTY_CYCLE_MASK;
641 : : } else {
642 : 0 : level <<= 1;
643 : 0 : mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
644 : : }
645 : :
646 : 0 : tmp = I915_READ(BLC_PWM_CTL) & ~mask;
647 : 0 : I915_WRITE(BLC_PWM_CTL, tmp | level);
648 : 0 : }
649 : :
650 : 0 : static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
651 : : {
652 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
653 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
654 : 0 : enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
655 : 0 : u32 tmp;
656 : :
657 : 0 : tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
658 : 0 : I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
659 : 0 : }
660 : :
661 : 0 : static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
662 : : {
663 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
664 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
665 : 0 : struct intel_panel *panel = &connector->panel;
666 : :
667 : 0 : I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
668 : 0 : }
669 : :
670 : 0 : static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
671 : : {
672 : 0 : struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
673 : 0 : int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
674 : :
675 : 0 : pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
676 : 0 : }
677 : :
678 : : static void
679 : 0 : intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
680 : : {
681 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
682 : 0 : struct intel_panel *panel = &connector->panel;
683 : :
684 : 0 : DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
685 : :
686 : 0 : level = intel_panel_compute_brightness(connector, level);
687 : 0 : panel->backlight.set(conn_state, level);
688 : 0 : }
689 : :
690 : : /* set backlight brightness to level in range [0..max], assuming hw min is
691 : : * respected.
692 : : */
693 : 0 : void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
694 : : u32 user_level, u32 user_max)
695 : : {
696 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
697 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
698 : 0 : struct intel_panel *panel = &connector->panel;
699 : 0 : u32 hw_level;
700 : :
701 : : /*
702 : : * Lack of crtc may occur during driver init because
703 : : * connection_mutex isn't held across the entire backlight
704 : : * setup + modeset readout, and the BIOS can issue the
705 : : * requests at any time.
706 : : */
707 [ # # # # ]: 0 : if (!panel->backlight.present || !conn_state->crtc)
708 : : return;
709 : :
710 : 0 : mutex_lock(&dev_priv->backlight_lock);
711 : :
712 [ # # ]: 0 : WARN_ON(panel->backlight.max == 0);
713 : :
714 : 0 : hw_level = clamp_user_to_hw(connector, user_level, user_max);
715 : 0 : panel->backlight.level = hw_level;
716 : :
717 [ # # ]: 0 : if (panel->backlight.device)
718 : 0 : panel->backlight.device->props.brightness =
719 : 0 : scale_hw_to_user(connector,
720 : : panel->backlight.level,
721 : 0 : panel->backlight.device->props.max_brightness);
722 : :
723 [ # # ]: 0 : if (panel->backlight.enabled)
724 : 0 : intel_panel_actually_set_backlight(conn_state, hw_level);
725 : :
726 : 0 : mutex_unlock(&dev_priv->backlight_lock);
727 : : }
728 : :
729 : 0 : static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state)
730 : : {
731 : 0 : struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
732 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
733 : 0 : u32 tmp;
734 : :
735 : 0 : intel_panel_actually_set_backlight(old_conn_state, 0);
736 : :
737 : : /*
738 : : * Although we don't support or enable CPU PWM with LPT/SPT based
739 : : * systems, it may have been enabled prior to loading the
740 : : * driver. Disable to avoid warnings on LCPLL disable.
741 : : *
742 : : * This needs rework if we need to add support for CPU PWM on PCH split
743 : : * platforms.
744 : : */
745 : 0 : tmp = I915_READ(BLC_PWM_CPU_CTL2);
746 [ # # ]: 0 : if (tmp & BLM_PWM_ENABLE) {
747 : 0 : DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
748 : 0 : I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
749 : : }
750 : :
751 : 0 : tmp = I915_READ(BLC_PWM_PCH_CTL1);
752 : 0 : I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
753 : 0 : }
754 : :
755 : 0 : static void pch_disable_backlight(const struct drm_connector_state *old_conn_state)
756 : : {
757 : 0 : struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
758 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
759 : 0 : u32 tmp;
760 : :
761 : 0 : intel_panel_actually_set_backlight(old_conn_state, 0);
762 : :
763 : 0 : tmp = I915_READ(BLC_PWM_CPU_CTL2);
764 : 0 : I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
765 : :
766 : 0 : tmp = I915_READ(BLC_PWM_PCH_CTL1);
767 : 0 : I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
768 : 0 : }
769 : :
770 : 0 : static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state)
771 : : {
772 : 0 : intel_panel_actually_set_backlight(old_conn_state, 0);
773 : 0 : }
774 : :
775 : 0 : static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
776 : : {
777 : 0 : struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
778 : 0 : u32 tmp;
779 : :
780 : 0 : intel_panel_actually_set_backlight(old_conn_state, 0);
781 : :
782 : 0 : tmp = I915_READ(BLC_PWM_CTL2);
783 : 0 : I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
784 : 0 : }
785 : :
786 : 0 : static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state)
787 : : {
788 : 0 : struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
789 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
790 : 0 : enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
791 : 0 : u32 tmp;
792 : :
793 : 0 : intel_panel_actually_set_backlight(old_conn_state, 0);
794 : :
795 : 0 : tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
796 : 0 : I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
797 : 0 : }
798 : :
799 : 0 : static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state)
800 : : {
801 : 0 : struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
802 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
803 : 0 : struct intel_panel *panel = &connector->panel;
804 : 0 : u32 tmp, val;
805 : :
806 : 0 : intel_panel_actually_set_backlight(old_conn_state, 0);
807 : :
808 : 0 : tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
809 : 0 : I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
810 : : tmp & ~BXT_BLC_PWM_ENABLE);
811 : :
812 [ # # ]: 0 : if (panel->backlight.controller == 1) {
813 : 0 : val = I915_READ(UTIL_PIN_CTL);
814 : 0 : val &= ~UTIL_PIN_ENABLE;
815 : 0 : I915_WRITE(UTIL_PIN_CTL, val);
816 : : }
817 : 0 : }
818 : :
819 : 0 : static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state)
820 : : {
821 : 0 : struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
822 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
823 : 0 : struct intel_panel *panel = &connector->panel;
824 : 0 : u32 tmp;
825 : :
826 : 0 : intel_panel_actually_set_backlight(old_conn_state, 0);
827 : :
828 : 0 : tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
829 : 0 : I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
830 : : tmp & ~BXT_BLC_PWM_ENABLE);
831 : 0 : }
832 : :
833 : 0 : static void pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
834 : : {
835 : 0 : struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
836 : 0 : struct intel_panel *panel = &connector->panel;
837 : :
838 : : /* Disable the backlight */
839 : 0 : intel_panel_actually_set_backlight(old_conn_state, 0);
840 : 0 : usleep_range(2000, 3000);
841 : 0 : pwm_disable(panel->backlight.pwm);
842 : 0 : }
843 : :
844 : 0 : void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
845 : : {
846 : 0 : struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
847 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
848 : 0 : struct intel_panel *panel = &connector->panel;
849 : :
850 [ # # ]: 0 : if (!panel->backlight.present)
851 : : return;
852 : :
853 : : /*
854 : : * Do not disable backlight on the vga_switcheroo path. When switching
855 : : * away from i915, the other client may depend on i915 to handle the
856 : : * backlight. This will leave the backlight on unnecessarily when
857 : : * another client is not activated.
858 : : */
859 [ # # ]: 0 : if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
860 : 0 : DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
861 : 0 : return;
862 : : }
863 : :
864 : 0 : mutex_lock(&dev_priv->backlight_lock);
865 : :
866 [ # # ]: 0 : if (panel->backlight.device)
867 : 0 : panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
868 : 0 : panel->backlight.enabled = false;
869 : 0 : panel->backlight.disable(old_conn_state);
870 : :
871 : 0 : mutex_unlock(&dev_priv->backlight_lock);
872 : : }
873 : :
874 : 0 : static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
875 : : const struct drm_connector_state *conn_state)
876 : : {
877 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
878 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
879 : 0 : struct intel_panel *panel = &connector->panel;
880 : 0 : u32 pch_ctl1, pch_ctl2, schicken;
881 : :
882 : 0 : pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
883 [ # # ]: 0 : if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
884 : 0 : DRM_DEBUG_KMS("pch backlight already enabled\n");
885 : 0 : pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
886 : 0 : I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
887 : : }
888 : :
889 [ # # ]: 0 : if (HAS_PCH_LPT(dev_priv)) {
890 : 0 : schicken = I915_READ(SOUTH_CHICKEN2);
891 [ # # ]: 0 : if (panel->backlight.alternate_pwm_increment)
892 : 0 : schicken |= LPT_PWM_GRANULARITY;
893 : : else
894 : 0 : schicken &= ~LPT_PWM_GRANULARITY;
895 : 0 : I915_WRITE(SOUTH_CHICKEN2, schicken);
896 : : } else {
897 : 0 : schicken = I915_READ(SOUTH_CHICKEN1);
898 [ # # ]: 0 : if (panel->backlight.alternate_pwm_increment)
899 : 0 : schicken |= SPT_PWM_GRANULARITY;
900 : : else
901 : 0 : schicken &= ~SPT_PWM_GRANULARITY;
902 : 0 : I915_WRITE(SOUTH_CHICKEN1, schicken);
903 : : }
904 : :
905 : 0 : pch_ctl2 = panel->backlight.max << 16;
906 : 0 : I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
907 : :
908 : 0 : pch_ctl1 = 0;
909 [ # # ]: 0 : if (panel->backlight.active_low_pwm)
910 : 0 : pch_ctl1 |= BLM_PCH_POLARITY;
911 : :
912 : : /* After LPT, override is the default. */
913 [ # # ]: 0 : if (HAS_PCH_LPT(dev_priv))
914 : 0 : pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
915 : :
916 : 0 : I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
917 : 0 : POSTING_READ(BLC_PWM_PCH_CTL1);
918 : 0 : I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
919 : :
920 : : /* This won't stick until the above enable. */
921 : 0 : intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
922 : 0 : }
923 : :
924 : 0 : static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
925 : : const struct drm_connector_state *conn_state)
926 : : {
927 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
928 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
929 : 0 : struct intel_panel *panel = &connector->panel;
930 : 0 : enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
931 : 0 : u32 cpu_ctl2, pch_ctl1, pch_ctl2;
932 : :
933 : 0 : cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
934 [ # # ]: 0 : if (cpu_ctl2 & BLM_PWM_ENABLE) {
935 : 0 : DRM_DEBUG_KMS("cpu backlight already enabled\n");
936 : 0 : cpu_ctl2 &= ~BLM_PWM_ENABLE;
937 : 0 : I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
938 : : }
939 : :
940 : 0 : pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
941 [ # # ]: 0 : if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
942 : 0 : DRM_DEBUG_KMS("pch backlight already enabled\n");
943 : 0 : pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
944 : 0 : I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
945 : : }
946 : :
947 [ # # ]: 0 : if (cpu_transcoder == TRANSCODER_EDP)
948 : : cpu_ctl2 = BLM_TRANSCODER_EDP;
949 : : else
950 : 0 : cpu_ctl2 = BLM_PIPE(cpu_transcoder);
951 : 0 : I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
952 : 0 : POSTING_READ(BLC_PWM_CPU_CTL2);
953 : 0 : I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
954 : :
955 : : /* This won't stick until the above enable. */
956 : 0 : intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
957 : :
958 : 0 : pch_ctl2 = panel->backlight.max << 16;
959 : 0 : I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
960 : :
961 : 0 : pch_ctl1 = 0;
962 [ # # ]: 0 : if (panel->backlight.active_low_pwm)
963 : 0 : pch_ctl1 |= BLM_PCH_POLARITY;
964 : :
965 : 0 : I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
966 : 0 : POSTING_READ(BLC_PWM_PCH_CTL1);
967 : 0 : I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
968 : 0 : }
969 : :
970 : 0 : static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
971 : : const struct drm_connector_state *conn_state)
972 : : {
973 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
974 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
975 : 0 : struct intel_panel *panel = &connector->panel;
976 : 0 : u32 ctl, freq;
977 : :
978 : 0 : ctl = I915_READ(BLC_PWM_CTL);
979 [ # # ]: 0 : if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
980 : 0 : DRM_DEBUG_KMS("backlight already enabled\n");
981 : 0 : I915_WRITE(BLC_PWM_CTL, 0);
982 : : }
983 : :
984 : 0 : freq = panel->backlight.max;
985 [ # # ]: 0 : if (panel->backlight.combination_mode)
986 : 0 : freq /= 0xff;
987 : :
988 : 0 : ctl = freq << 17;
989 [ # # ]: 0 : if (panel->backlight.combination_mode)
990 : 0 : ctl |= BLM_LEGACY_MODE;
991 [ # # # # ]: 0 : if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
992 : 0 : ctl |= BLM_POLARITY_PNV;
993 : :
994 : 0 : I915_WRITE(BLC_PWM_CTL, ctl);
995 : 0 : POSTING_READ(BLC_PWM_CTL);
996 : :
997 : : /* XXX: combine this into above write? */
998 : 0 : intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
999 : :
1000 : : /*
1001 : : * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
1002 : : * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
1003 : : * that has backlight.
1004 : : */
1005 [ # # ]: 0 : if (IS_GEN(dev_priv, 2))
1006 : 0 : I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
1007 : 0 : }
1008 : :
1009 : 0 : static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
1010 : : const struct drm_connector_state *conn_state)
1011 : : {
1012 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
1013 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1014 : 0 : struct intel_panel *panel = &connector->panel;
1015 : 0 : enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
1016 : 0 : u32 ctl, ctl2, freq;
1017 : :
1018 : 0 : ctl2 = I915_READ(BLC_PWM_CTL2);
1019 [ # # ]: 0 : if (ctl2 & BLM_PWM_ENABLE) {
1020 : 0 : DRM_DEBUG_KMS("backlight already enabled\n");
1021 : 0 : ctl2 &= ~BLM_PWM_ENABLE;
1022 : 0 : I915_WRITE(BLC_PWM_CTL2, ctl2);
1023 : : }
1024 : :
1025 : 0 : freq = panel->backlight.max;
1026 [ # # ]: 0 : if (panel->backlight.combination_mode)
1027 : 0 : freq /= 0xff;
1028 : :
1029 : 0 : ctl = freq << 16;
1030 : 0 : I915_WRITE(BLC_PWM_CTL, ctl);
1031 : :
1032 : 0 : ctl2 = BLM_PIPE(pipe);
1033 [ # # ]: 0 : if (panel->backlight.combination_mode)
1034 : 0 : ctl2 |= BLM_COMBINATION_MODE;
1035 [ # # ]: 0 : if (panel->backlight.active_low_pwm)
1036 : 0 : ctl2 |= BLM_POLARITY_I965;
1037 : 0 : I915_WRITE(BLC_PWM_CTL2, ctl2);
1038 : 0 : POSTING_READ(BLC_PWM_CTL2);
1039 : 0 : I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1040 : :
1041 : 0 : intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1042 : 0 : }
1043 : :
1044 : 0 : static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1045 : : const struct drm_connector_state *conn_state)
1046 : : {
1047 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
1048 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1049 : 0 : struct intel_panel *panel = &connector->panel;
1050 : 0 : enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1051 : 0 : u32 ctl, ctl2;
1052 : :
1053 : 0 : ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1054 [ # # ]: 0 : if (ctl2 & BLM_PWM_ENABLE) {
1055 : 0 : DRM_DEBUG_KMS("backlight already enabled\n");
1056 : 0 : ctl2 &= ~BLM_PWM_ENABLE;
1057 : 0 : I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1058 : : }
1059 : :
1060 : 0 : ctl = panel->backlight.max << 16;
1061 : 0 : I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1062 : :
1063 : : /* XXX: combine this into above write? */
1064 : 0 : intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1065 : :
1066 : 0 : ctl2 = 0;
1067 [ # # ]: 0 : if (panel->backlight.active_low_pwm)
1068 : 0 : ctl2 |= BLM_POLARITY_I965;
1069 : 0 : I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1070 : 0 : POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1071 : 0 : I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1072 : 0 : }
1073 : :
1074 : 0 : static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1075 : : const struct drm_connector_state *conn_state)
1076 : : {
1077 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
1078 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1079 : 0 : struct intel_panel *panel = &connector->panel;
1080 : 0 : enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1081 : 0 : u32 pwm_ctl, val;
1082 : :
1083 : : /* Controller 1 uses the utility pin. */
1084 [ # # ]: 0 : if (panel->backlight.controller == 1) {
1085 : 0 : val = I915_READ(UTIL_PIN_CTL);
1086 [ # # ]: 0 : if (val & UTIL_PIN_ENABLE) {
1087 : 0 : DRM_DEBUG_KMS("util pin already enabled\n");
1088 : 0 : val &= ~UTIL_PIN_ENABLE;
1089 : 0 : I915_WRITE(UTIL_PIN_CTL, val);
1090 : : }
1091 : :
1092 : 0 : val = 0;
1093 [ # # ]: 0 : if (panel->backlight.util_pin_active_low)
1094 : 0 : val |= UTIL_PIN_POLARITY;
1095 : 0 : I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
1096 : : UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1097 : : }
1098 : :
1099 : 0 : pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1100 [ # # ]: 0 : if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1101 : 0 : DRM_DEBUG_KMS("backlight already enabled\n");
1102 : 0 : pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1103 : 0 : I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1104 : : pwm_ctl);
1105 : : }
1106 : :
1107 : 0 : I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1108 : : panel->backlight.max);
1109 : :
1110 : 0 : intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1111 : :
1112 : 0 : pwm_ctl = 0;
1113 [ # # ]: 0 : if (panel->backlight.active_low_pwm)
1114 : 0 : pwm_ctl |= BXT_BLC_PWM_POLARITY;
1115 : :
1116 : 0 : I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1117 : 0 : POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1118 : 0 : I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1119 : : pwm_ctl | BXT_BLC_PWM_ENABLE);
1120 : 0 : }
1121 : :
1122 : 0 : static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1123 : : const struct drm_connector_state *conn_state)
1124 : : {
1125 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
1126 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1127 : 0 : struct intel_panel *panel = &connector->panel;
1128 : 0 : u32 pwm_ctl;
1129 : :
1130 : 0 : pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1131 [ # # ]: 0 : if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1132 : 0 : DRM_DEBUG_KMS("backlight already enabled\n");
1133 : 0 : pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1134 : 0 : I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1135 : : pwm_ctl);
1136 : : }
1137 : :
1138 : 0 : I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1139 : : panel->backlight.max);
1140 : :
1141 : 0 : intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1142 : :
1143 : 0 : pwm_ctl = 0;
1144 [ # # ]: 0 : if (panel->backlight.active_low_pwm)
1145 : 0 : pwm_ctl |= BXT_BLC_PWM_POLARITY;
1146 : :
1147 : 0 : I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1148 : 0 : POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1149 : 0 : I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1150 : : pwm_ctl | BXT_BLC_PWM_ENABLE);
1151 : 0 : }
1152 : :
1153 : 0 : static void pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1154 : : const struct drm_connector_state *conn_state)
1155 : : {
1156 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
1157 : 0 : struct intel_panel *panel = &connector->panel;
1158 : :
1159 : 0 : pwm_enable(panel->backlight.pwm);
1160 : 0 : intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1161 : 0 : }
1162 : :
1163 : 0 : static void __intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1164 : : const struct drm_connector_state *conn_state)
1165 : : {
1166 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
1167 : 0 : struct intel_panel *panel = &connector->panel;
1168 : :
1169 [ # # ]: 0 : WARN_ON(panel->backlight.max == 0);
1170 : :
1171 [ # # ]: 0 : if (panel->backlight.level <= panel->backlight.min) {
1172 : 0 : panel->backlight.level = panel->backlight.max;
1173 [ # # ]: 0 : if (panel->backlight.device)
1174 : 0 : panel->backlight.device->props.brightness =
1175 : 0 : scale_hw_to_user(connector,
1176 : : panel->backlight.level,
1177 : 0 : panel->backlight.device->props.max_brightness);
1178 : : }
1179 : :
1180 : 0 : panel->backlight.enable(crtc_state, conn_state);
1181 : 0 : panel->backlight.enabled = true;
1182 [ # # ]: 0 : if (panel->backlight.device)
1183 : 0 : panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1184 : 0 : }
1185 : :
1186 : 0 : void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1187 : : const struct drm_connector_state *conn_state)
1188 : : {
1189 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
1190 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1191 : 0 : struct intel_panel *panel = &connector->panel;
1192 : 0 : enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1193 : :
1194 [ # # ]: 0 : if (!panel->backlight.present)
1195 : : return;
1196 : :
1197 : 0 : DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1198 : :
1199 : 0 : mutex_lock(&dev_priv->backlight_lock);
1200 : :
1201 : 0 : __intel_panel_enable_backlight(crtc_state, conn_state);
1202 : :
1203 : 0 : mutex_unlock(&dev_priv->backlight_lock);
1204 : : }
1205 : :
1206 : : #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1207 : 0 : static u32 intel_panel_get_backlight(struct intel_connector *connector)
1208 : : {
1209 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1210 : 0 : struct intel_panel *panel = &connector->panel;
1211 : 0 : u32 val = 0;
1212 : :
1213 : 0 : mutex_lock(&dev_priv->backlight_lock);
1214 : :
1215 [ # # ]: 0 : if (panel->backlight.enabled) {
1216 : 0 : val = panel->backlight.get(connector);
1217 : 0 : val = intel_panel_compute_brightness(connector, val);
1218 : : }
1219 : :
1220 : 0 : mutex_unlock(&dev_priv->backlight_lock);
1221 : :
1222 : 0 : DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
1223 : 0 : return val;
1224 : : }
1225 : :
1226 : : /* set backlight brightness to level in range [0..max], scaling wrt hw min */
1227 : 0 : static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
1228 : : u32 user_level, u32 user_max)
1229 : : {
1230 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
1231 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1232 : 0 : struct intel_panel *panel = &connector->panel;
1233 : 0 : u32 hw_level;
1234 : :
1235 [ # # ]: 0 : if (!panel->backlight.present)
1236 : : return;
1237 : :
1238 : 0 : mutex_lock(&dev_priv->backlight_lock);
1239 : :
1240 [ # # ]: 0 : WARN_ON(panel->backlight.max == 0);
1241 : :
1242 : 0 : hw_level = scale_user_to_hw(connector, user_level, user_max);
1243 : 0 : panel->backlight.level = hw_level;
1244 : :
1245 [ # # ]: 0 : if (panel->backlight.enabled)
1246 : 0 : intel_panel_actually_set_backlight(conn_state, hw_level);
1247 : :
1248 : 0 : mutex_unlock(&dev_priv->backlight_lock);
1249 : : }
1250 : :
1251 : 0 : static int intel_backlight_device_update_status(struct backlight_device *bd)
1252 : : {
1253 : 0 : struct intel_connector *connector = bl_get_data(bd);
1254 : 0 : struct intel_panel *panel = &connector->panel;
1255 : 0 : struct drm_device *dev = connector->base.dev;
1256 : :
1257 : 0 : drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1258 : 0 : DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1259 : : bd->props.brightness, bd->props.max_brightness);
1260 : 0 : intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1261 : 0 : bd->props.max_brightness);
1262 : :
1263 : : /*
1264 : : * Allow flipping bl_power as a sub-state of enabled. Sadly the
1265 : : * backlight class device does not make it easy to to differentiate
1266 : : * between callbacks for brightness and bl_power, so our backlight_power
1267 : : * callback needs to take this into account.
1268 : : */
1269 [ # # ]: 0 : if (panel->backlight.enabled) {
1270 [ # # ]: 0 : if (panel->backlight.power) {
1271 [ # # ]: 0 : bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1272 [ # # ]: 0 : bd->props.brightness != 0;
1273 : 0 : panel->backlight.power(connector, enable);
1274 : : }
1275 : : } else {
1276 : 0 : bd->props.power = FB_BLANK_POWERDOWN;
1277 : : }
1278 : :
1279 : 0 : drm_modeset_unlock(&dev->mode_config.connection_mutex);
1280 : 0 : return 0;
1281 : : }
1282 : :
1283 : 0 : static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1284 : : {
1285 : 0 : struct intel_connector *connector = bl_get_data(bd);
1286 : 0 : struct drm_device *dev = connector->base.dev;
1287 : 0 : struct drm_i915_private *dev_priv = to_i915(dev);
1288 : 0 : intel_wakeref_t wakeref;
1289 : 0 : int ret = 0;
1290 : :
1291 [ # # ]: 0 : with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
1292 : 0 : u32 hw_level;
1293 : :
1294 : 0 : drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1295 : :
1296 : 0 : hw_level = intel_panel_get_backlight(connector);
1297 : 0 : ret = scale_hw_to_user(connector,
1298 : 0 : hw_level, bd->props.max_brightness);
1299 : :
1300 : 0 : drm_modeset_unlock(&dev->mode_config.connection_mutex);
1301 : : }
1302 : :
1303 : 0 : return ret;
1304 : : }
1305 : :
1306 : : static const struct backlight_ops intel_backlight_device_ops = {
1307 : : .update_status = intel_backlight_device_update_status,
1308 : : .get_brightness = intel_backlight_device_get_brightness,
1309 : : };
1310 : :
1311 : 0 : int intel_backlight_device_register(struct intel_connector *connector)
1312 : : {
1313 : 0 : struct intel_panel *panel = &connector->panel;
1314 : 0 : struct backlight_properties props;
1315 : :
1316 [ # # # # ]: 0 : if (WARN_ON(panel->backlight.device))
1317 : : return -ENODEV;
1318 : :
1319 [ # # ]: 0 : if (!panel->backlight.present)
1320 : : return 0;
1321 : :
1322 [ # # ]: 0 : WARN_ON(panel->backlight.max == 0);
1323 : :
1324 : 0 : memset(&props, 0, sizeof(props));
1325 : 0 : props.type = BACKLIGHT_RAW;
1326 : :
1327 : : /*
1328 : : * Note: Everything should work even if the backlight device max
1329 : : * presented to the userspace is arbitrarily chosen.
1330 : : */
1331 : 0 : props.max_brightness = panel->backlight.max;
1332 : 0 : props.brightness = scale_hw_to_user(connector,
1333 : : panel->backlight.level,
1334 : : props.max_brightness);
1335 : :
1336 [ # # ]: 0 : if (panel->backlight.enabled)
1337 : 0 : props.power = FB_BLANK_UNBLANK;
1338 : : else
1339 : 0 : props.power = FB_BLANK_POWERDOWN;
1340 : :
1341 : : /*
1342 : : * Note: using the same name independent of the connector prevents
1343 : : * registration of multiple backlight devices in the driver.
1344 : : */
1345 : 0 : panel->backlight.device =
1346 : 0 : backlight_device_register("intel_backlight",
1347 : : connector->base.kdev,
1348 : : connector,
1349 : : &intel_backlight_device_ops, &props);
1350 : :
1351 [ # # ]: 0 : if (IS_ERR(panel->backlight.device)) {
1352 : 0 : DRM_ERROR("Failed to register backlight: %ld\n",
1353 : : PTR_ERR(panel->backlight.device));
1354 : 0 : panel->backlight.device = NULL;
1355 : 0 : return -ENODEV;
1356 : : }
1357 : :
1358 : 0 : DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1359 : : connector->base.name);
1360 : :
1361 : 0 : return 0;
1362 : : }
1363 : :
1364 : 0 : void intel_backlight_device_unregister(struct intel_connector *connector)
1365 : : {
1366 : 0 : struct intel_panel *panel = &connector->panel;
1367 : :
1368 [ # # ]: 0 : if (panel->backlight.device) {
1369 : 0 : backlight_device_unregister(panel->backlight.device);
1370 : 0 : panel->backlight.device = NULL;
1371 : : }
1372 : 0 : }
1373 : : #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1374 : :
1375 : : /*
1376 : : * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1377 : : * PWM increment = 1
1378 : : */
1379 : 0 : static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1380 : : {
1381 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1382 : :
1383 : 0 : return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
1384 : : }
1385 : :
1386 : : /*
1387 : : * BXT: PWM clock frequency = 19.2 MHz.
1388 : : */
1389 : 0 : static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1390 : : {
1391 : 0 : return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1392 : : }
1393 : :
1394 : : /*
1395 : : * SPT: This value represents the period of the PWM stream in clock periods
1396 : : * multiplied by 16 (default increment) or 128 (alternate increment selected in
1397 : : * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1398 : : */
1399 : 0 : static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1400 : : {
1401 : 0 : struct intel_panel *panel = &connector->panel;
1402 : 0 : u32 mul;
1403 : :
1404 [ # # ]: 0 : if (panel->backlight.alternate_pwm_increment)
1405 : : mul = 128;
1406 : : else
1407 : 0 : mul = 16;
1408 : :
1409 : 0 : return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1410 : : }
1411 : :
1412 : : /*
1413 : : * LPT: This value represents the period of the PWM stream in clock periods
1414 : : * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1415 : : * LPT SOUTH_CHICKEN2 register bit 5).
1416 : : */
1417 : 0 : static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1418 : : {
1419 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1420 : 0 : struct intel_panel *panel = &connector->panel;
1421 : 0 : u32 mul, clock;
1422 : :
1423 [ # # ]: 0 : if (panel->backlight.alternate_pwm_increment)
1424 : : mul = 16;
1425 : : else
1426 : 0 : mul = 128;
1427 : :
1428 [ # # ]: 0 : if (HAS_PCH_LPT_H(dev_priv))
1429 : : clock = MHz(135); /* LPT:H */
1430 : : else
1431 : 0 : clock = MHz(24); /* LPT:LP */
1432 : :
1433 : 0 : return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1434 : : }
1435 : :
1436 : : /*
1437 : : * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1438 : : * display raw clocks multiplied by 128.
1439 : : */
1440 : 0 : static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1441 : : {
1442 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1443 : :
1444 : 0 : return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz * 128);
1445 : : }
1446 : :
1447 : : /*
1448 : : * Gen2: This field determines the number of time base events (display core
1449 : : * clock frequency/32) in total for a complete cycle of modulated backlight
1450 : : * control.
1451 : : *
1452 : : * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1453 : : * divided by 32.
1454 : : */
1455 : 0 : static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1456 : : {
1457 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1458 : 0 : int clock;
1459 : :
1460 [ # # ]: 0 : if (IS_PINEVIEW(dev_priv))
1461 : 0 : clock = KHz(dev_priv->rawclk_freq);
1462 : : else
1463 : 0 : clock = KHz(dev_priv->cdclk.hw.cdclk);
1464 : :
1465 : 0 : return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1466 : : }
1467 : :
1468 : : /*
1469 : : * Gen4: This value represents the period of the PWM stream in display core
1470 : : * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1471 : : *
1472 : : */
1473 : 0 : static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1474 : : {
1475 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1476 : 0 : int clock;
1477 : :
1478 [ # # # # ]: 0 : if (IS_G4X(dev_priv))
1479 : 0 : clock = KHz(dev_priv->rawclk_freq);
1480 : : else
1481 : 0 : clock = KHz(dev_priv->cdclk.hw.cdclk);
1482 : :
1483 : 0 : return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1484 : : }
1485 : :
1486 : : /*
1487 : : * VLV: This value represents the period of the PWM stream in display core
1488 : : * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1489 : : * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1490 : : */
1491 : 0 : static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1492 : : {
1493 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1494 : 0 : int mul, clock;
1495 : :
1496 [ # # ]: 0 : if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1497 [ # # ]: 0 : if (IS_CHERRYVIEW(dev_priv))
1498 : : clock = KHz(19200);
1499 : : else
1500 : 0 : clock = MHz(25);
1501 : : mul = 16;
1502 : : } else {
1503 : 0 : clock = KHz(dev_priv->rawclk_freq);
1504 : 0 : mul = 128;
1505 : : }
1506 : :
1507 : 0 : return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1508 : : }
1509 : :
1510 : 0 : static u32 get_backlight_max_vbt(struct intel_connector *connector)
1511 : : {
1512 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1513 : 0 : struct intel_panel *panel = &connector->panel;
1514 : 0 : u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1515 : 0 : u32 pwm;
1516 : :
1517 [ # # ]: 0 : if (!panel->backlight.hz_to_pwm) {
1518 : 0 : DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
1519 : 0 : return 0;
1520 : : }
1521 : :
1522 [ # # ]: 0 : if (pwm_freq_hz) {
1523 : 0 : DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
1524 : : pwm_freq_hz);
1525 : : } else {
1526 : 0 : pwm_freq_hz = 200;
1527 : 0 : DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
1528 : : pwm_freq_hz);
1529 : : }
1530 : :
1531 : 0 : pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1532 [ # # ]: 0 : if (!pwm) {
1533 : 0 : DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1534 : 0 : return 0;
1535 : : }
1536 : :
1537 : : return pwm;
1538 : : }
1539 : :
1540 : : /*
1541 : : * Note: The setup hooks can't assume pipe is set!
1542 : : */
1543 : 0 : static u32 get_backlight_min_vbt(struct intel_connector *connector)
1544 : : {
1545 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1546 : 0 : struct intel_panel *panel = &connector->panel;
1547 : 0 : int min;
1548 : :
1549 [ # # ]: 0 : WARN_ON(panel->backlight.max == 0);
1550 : :
1551 : : /*
1552 : : * XXX: If the vbt value is 255, it makes min equal to max, which leads
1553 : : * to problems. There are such machines out there. Either our
1554 : : * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1555 : : * against this by letting the minimum be at most (arbitrarily chosen)
1556 : : * 25% of the max.
1557 : : */
1558 : 0 : min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1559 [ # # ]: 0 : if (min != dev_priv->vbt.backlight.min_brightness) {
1560 : 0 : DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1561 : : dev_priv->vbt.backlight.min_brightness, min);
1562 : : }
1563 : :
1564 : : /* vbt value is a coefficient in range [0..255] */
1565 : 0 : return scale(min, 0, 255, 0, panel->backlight.max);
1566 : : }
1567 : :
1568 : 0 : static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1569 : : {
1570 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1571 : 0 : struct intel_panel *panel = &connector->panel;
1572 : 0 : u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1573 : 0 : bool alt, cpu_mode;
1574 : :
1575 [ # # ]: 0 : if (HAS_PCH_LPT(dev_priv))
1576 : 0 : alt = I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1577 : : else
1578 : 0 : alt = I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1579 : 0 : panel->backlight.alternate_pwm_increment = alt;
1580 : :
1581 : 0 : pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1582 : 0 : panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1583 : :
1584 : 0 : pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1585 : 0 : panel->backlight.max = pch_ctl2 >> 16;
1586 : :
1587 : 0 : cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1588 : :
1589 [ # # ]: 0 : if (!panel->backlight.max)
1590 : 0 : panel->backlight.max = get_backlight_max_vbt(connector);
1591 : :
1592 [ # # ]: 0 : if (!panel->backlight.max)
1593 : : return -ENODEV;
1594 : :
1595 : 0 : panel->backlight.min = get_backlight_min_vbt(connector);
1596 : :
1597 : 0 : panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1598 : :
1599 [ # # ]: 0 : cpu_mode = panel->backlight.enabled && HAS_PCH_LPT(dev_priv) &&
1600 [ # # # # : 0 : !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
# # ]
1601 : : (cpu_ctl2 & BLM_PWM_ENABLE);
1602 [ # # ]: 0 : if (cpu_mode)
1603 : 0 : val = pch_get_backlight(connector);
1604 : : else
1605 : 0 : val = lpt_get_backlight(connector);
1606 : 0 : val = intel_panel_compute_brightness(connector, val);
1607 : 0 : panel->backlight.level = clamp(val, panel->backlight.min,
1608 : : panel->backlight.max);
1609 : :
1610 [ # # ]: 0 : if (cpu_mode) {
1611 : 0 : DRM_DEBUG_KMS("CPU backlight register was enabled, switching to PCH override\n");
1612 : :
1613 : : /* Write converted CPU PWM value to PCH override register */
1614 : 0 : lpt_set_backlight(connector->base.state, panel->backlight.level);
1615 : 0 : I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
1616 : :
1617 : 0 : I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 & ~BLM_PWM_ENABLE);
1618 : : }
1619 : :
1620 : : return 0;
1621 : : }
1622 : :
1623 : 0 : static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1624 : : {
1625 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1626 : 0 : struct intel_panel *panel = &connector->panel;
1627 : 0 : u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1628 : :
1629 : 0 : pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1630 : 0 : panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1631 : :
1632 : 0 : pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1633 : 0 : panel->backlight.max = pch_ctl2 >> 16;
1634 : :
1635 [ # # ]: 0 : if (!panel->backlight.max)
1636 : 0 : panel->backlight.max = get_backlight_max_vbt(connector);
1637 : :
1638 [ # # ]: 0 : if (!panel->backlight.max)
1639 : : return -ENODEV;
1640 : :
1641 : 0 : panel->backlight.min = get_backlight_min_vbt(connector);
1642 : :
1643 : 0 : val = pch_get_backlight(connector);
1644 : 0 : val = intel_panel_compute_brightness(connector, val);
1645 : 0 : panel->backlight.level = clamp(val, panel->backlight.min,
1646 : : panel->backlight.max);
1647 : :
1648 : 0 : cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1649 : 0 : panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1650 : : (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1651 : :
1652 : 0 : return 0;
1653 : : }
1654 : :
1655 : 0 : static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1656 : : {
1657 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1658 : 0 : struct intel_panel *panel = &connector->panel;
1659 : 0 : u32 ctl, val;
1660 : :
1661 : 0 : ctl = I915_READ(BLC_PWM_CTL);
1662 : :
1663 [ # # # # : 0 : if (IS_GEN(dev_priv, 2) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
# # ]
1664 : 0 : panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1665 : :
1666 [ # # ]: 0 : if (IS_PINEVIEW(dev_priv))
1667 : 0 : panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1668 : :
1669 : 0 : panel->backlight.max = ctl >> 17;
1670 : :
1671 [ # # ]: 0 : if (!panel->backlight.max) {
1672 : 0 : panel->backlight.max = get_backlight_max_vbt(connector);
1673 : 0 : panel->backlight.max >>= 1;
1674 : : }
1675 : :
1676 [ # # ]: 0 : if (!panel->backlight.max)
1677 : : return -ENODEV;
1678 : :
1679 [ # # ]: 0 : if (panel->backlight.combination_mode)
1680 : 0 : panel->backlight.max *= 0xff;
1681 : :
1682 : 0 : panel->backlight.min = get_backlight_min_vbt(connector);
1683 : :
1684 : 0 : val = i9xx_get_backlight(connector);
1685 : 0 : val = intel_panel_compute_brightness(connector, val);
1686 : 0 : panel->backlight.level = clamp(val, panel->backlight.min,
1687 : : panel->backlight.max);
1688 : :
1689 : 0 : panel->backlight.enabled = val != 0;
1690 : :
1691 : 0 : return 0;
1692 : : }
1693 : :
1694 : 0 : static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1695 : : {
1696 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1697 : 0 : struct intel_panel *panel = &connector->panel;
1698 : 0 : u32 ctl, ctl2, val;
1699 : :
1700 : 0 : ctl2 = I915_READ(BLC_PWM_CTL2);
1701 : 0 : panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1702 : 0 : panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1703 : :
1704 : 0 : ctl = I915_READ(BLC_PWM_CTL);
1705 : 0 : panel->backlight.max = ctl >> 16;
1706 : :
1707 [ # # ]: 0 : if (!panel->backlight.max)
1708 : 0 : panel->backlight.max = get_backlight_max_vbt(connector);
1709 : :
1710 [ # # ]: 0 : if (!panel->backlight.max)
1711 : : return -ENODEV;
1712 : :
1713 [ # # ]: 0 : if (panel->backlight.combination_mode)
1714 : 0 : panel->backlight.max *= 0xff;
1715 : :
1716 : 0 : panel->backlight.min = get_backlight_min_vbt(connector);
1717 : :
1718 : 0 : val = i9xx_get_backlight(connector);
1719 : 0 : val = intel_panel_compute_brightness(connector, val);
1720 : 0 : panel->backlight.level = clamp(val, panel->backlight.min,
1721 : : panel->backlight.max);
1722 : :
1723 : 0 : panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1724 : :
1725 : 0 : return 0;
1726 : : }
1727 : :
1728 : 0 : static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1729 : : {
1730 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1731 : 0 : struct intel_panel *panel = &connector->panel;
1732 : 0 : u32 ctl, ctl2, val;
1733 : :
1734 [ # # # # ]: 0 : if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1735 : : return -ENODEV;
1736 : :
1737 : 0 : ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1738 : 0 : panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1739 : :
1740 : 0 : ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1741 : 0 : panel->backlight.max = ctl >> 16;
1742 : :
1743 [ # # ]: 0 : if (!panel->backlight.max)
1744 : 0 : panel->backlight.max = get_backlight_max_vbt(connector);
1745 : :
1746 [ # # ]: 0 : if (!panel->backlight.max)
1747 : : return -ENODEV;
1748 : :
1749 : 0 : panel->backlight.min = get_backlight_min_vbt(connector);
1750 : :
1751 : 0 : val = _vlv_get_backlight(dev_priv, pipe);
1752 : 0 : val = intel_panel_compute_brightness(connector, val);
1753 : 0 : panel->backlight.level = clamp(val, panel->backlight.min,
1754 : : panel->backlight.max);
1755 : :
1756 : 0 : panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1757 : :
1758 : 0 : return 0;
1759 : : }
1760 : :
1761 : : static int
1762 : 0 : bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1763 : : {
1764 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1765 : 0 : struct intel_panel *panel = &connector->panel;
1766 : 0 : u32 pwm_ctl, val;
1767 : :
1768 : 0 : panel->backlight.controller = dev_priv->vbt.backlight.controller;
1769 : :
1770 : 0 : pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1771 : :
1772 : : /* Controller 1 uses the utility pin. */
1773 [ # # ]: 0 : if (panel->backlight.controller == 1) {
1774 : 0 : val = I915_READ(UTIL_PIN_CTL);
1775 : 0 : panel->backlight.util_pin_active_low =
1776 : 0 : val & UTIL_PIN_POLARITY;
1777 : : }
1778 : :
1779 : 0 : panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1780 : 0 : panel->backlight.max =
1781 : 0 : I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1782 : :
1783 [ # # ]: 0 : if (!panel->backlight.max)
1784 : 0 : panel->backlight.max = get_backlight_max_vbt(connector);
1785 : :
1786 [ # # ]: 0 : if (!panel->backlight.max)
1787 : : return -ENODEV;
1788 : :
1789 : 0 : panel->backlight.min = get_backlight_min_vbt(connector);
1790 : :
1791 : 0 : val = bxt_get_backlight(connector);
1792 : 0 : val = intel_panel_compute_brightness(connector, val);
1793 : 0 : panel->backlight.level = clamp(val, panel->backlight.min,
1794 : : panel->backlight.max);
1795 : :
1796 : 0 : panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1797 : :
1798 : 0 : return 0;
1799 : : }
1800 : :
1801 : : static int
1802 : 0 : cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1803 : : {
1804 : 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1805 : 0 : struct intel_panel *panel = &connector->panel;
1806 : 0 : u32 pwm_ctl, val;
1807 : :
1808 : : /*
1809 : : * CNP has the BXT implementation of backlight, but with only one
1810 : : * controller. TODO: ICP has multiple controllers but we only use
1811 : : * controller 0 for now.
1812 : : */
1813 : 0 : panel->backlight.controller = 0;
1814 : :
1815 : 0 : pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1816 : :
1817 : 0 : panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1818 : 0 : panel->backlight.max =
1819 : 0 : I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1820 : :
1821 [ # # ]: 0 : if (!panel->backlight.max)
1822 : 0 : panel->backlight.max = get_backlight_max_vbt(connector);
1823 : :
1824 [ # # ]: 0 : if (!panel->backlight.max)
1825 : : return -ENODEV;
1826 : :
1827 : 0 : panel->backlight.min = get_backlight_min_vbt(connector);
1828 : :
1829 : 0 : val = bxt_get_backlight(connector);
1830 : 0 : val = intel_panel_compute_brightness(connector, val);
1831 : 0 : panel->backlight.level = clamp(val, panel->backlight.min,
1832 : : panel->backlight.max);
1833 : :
1834 : 0 : panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1835 : :
1836 : 0 : return 0;
1837 : : }
1838 : :
1839 : 0 : static int pwm_setup_backlight(struct intel_connector *connector,
1840 : : enum pipe pipe)
1841 : : {
1842 : 0 : struct drm_device *dev = connector->base.dev;
1843 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(dev);
1844 : 0 : struct intel_panel *panel = &connector->panel;
1845 : 0 : const char *desc;
1846 : 0 : int retval;
1847 : :
1848 : : /* Get the right PWM chip for DSI backlight according to VBT */
1849 [ # # ]: 0 : if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
1850 : 0 : panel->backlight.pwm = pwm_get(dev->dev, "pwm_pmic_backlight");
1851 : 0 : desc = "PMIC";
1852 : : } else {
1853 : 0 : panel->backlight.pwm = pwm_get(dev->dev, "pwm_soc_backlight");
1854 : 0 : desc = "SoC";
1855 : : }
1856 : :
1857 [ # # ]: 0 : if (IS_ERR(panel->backlight.pwm)) {
1858 : 0 : DRM_ERROR("Failed to get the %s PWM chip\n", desc);
1859 : 0 : panel->backlight.pwm = NULL;
1860 : 0 : return -ENODEV;
1861 : : }
1862 : :
1863 : : /*
1864 : : * FIXME: pwm_apply_args() should be removed when switching to
1865 : : * the atomic PWM API.
1866 : : */
1867 : 0 : pwm_apply_args(panel->backlight.pwm);
1868 : :
1869 : 0 : retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1870 : : CRC_PMIC_PWM_PERIOD_NS);
1871 : 0 : if (retval < 0) {
1872 : 0 : DRM_ERROR("Failed to configure the pwm chip\n");
1873 : 0 : pwm_put(panel->backlight.pwm);
1874 : 0 : panel->backlight.pwm = NULL;
1875 : 0 : return retval;
1876 : : }
1877 : :
1878 : : panel->backlight.min = 0; /* 0% */
1879 : : panel->backlight.max = 100; /* 100% */
1880 : : panel->backlight.level = DIV_ROUND_UP(
1881 : : pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1882 : : CRC_PMIC_PWM_PERIOD_NS);
1883 : : panel->backlight.enabled = panel->backlight.level != 0;
1884 : :
1885 : : DRM_INFO("Using %s PWM for LCD backlight control\n", desc);
1886 : : return 0;
1887 : : }
1888 : :
1889 : 0 : void intel_panel_update_backlight(struct intel_encoder *encoder,
1890 : : const struct intel_crtc_state *crtc_state,
1891 : : const struct drm_connector_state *conn_state)
1892 : : {
1893 : 0 : struct intel_connector *connector = to_intel_connector(conn_state->connector);
1894 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1895 : 0 : struct intel_panel *panel = &connector->panel;
1896 : :
1897 [ # # ]: 0 : if (!panel->backlight.present)
1898 : : return;
1899 : :
1900 : 0 : mutex_lock(&dev_priv->backlight_lock);
1901 [ # # ]: 0 : if (!panel->backlight.enabled)
1902 : 0 : __intel_panel_enable_backlight(crtc_state, conn_state);
1903 : :
1904 : 0 : mutex_unlock(&dev_priv->backlight_lock);
1905 : : }
1906 : :
1907 : 0 : int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1908 : : {
1909 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->dev);
1910 : 0 : struct intel_connector *intel_connector = to_intel_connector(connector);
1911 : 0 : struct intel_panel *panel = &intel_connector->panel;
1912 : 0 : int ret;
1913 : :
1914 [ # # ]: 0 : if (!dev_priv->vbt.backlight.present) {
1915 [ # # ]: 0 : if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1916 : 0 : DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1917 : : } else {
1918 : 0 : DRM_DEBUG_KMS("no backlight present per VBT\n");
1919 : 0 : return 0;
1920 : : }
1921 : : }
1922 : :
1923 : : /* ensure intel_panel has been initialized first */
1924 [ # # # # ]: 0 : if (WARN_ON(!panel->backlight.setup))
1925 : : return -ENODEV;
1926 : :
1927 : : /* set level and max in panel struct */
1928 : 0 : mutex_lock(&dev_priv->backlight_lock);
1929 : 0 : ret = panel->backlight.setup(intel_connector, pipe);
1930 : 0 : mutex_unlock(&dev_priv->backlight_lock);
1931 : :
1932 [ # # ]: 0 : if (ret) {
1933 : 0 : DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1934 : : connector->name);
1935 : 0 : return ret;
1936 : : }
1937 : :
1938 : 0 : panel->backlight.present = true;
1939 : :
1940 [ # # ]: 0 : DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1941 : : connector->name,
1942 : : enableddisabled(panel->backlight.enabled),
1943 : : panel->backlight.level, panel->backlight.max);
1944 : :
1945 : 0 : return 0;
1946 : : }
1947 : :
1948 : 0 : static void intel_panel_destroy_backlight(struct intel_panel *panel)
1949 : : {
1950 : : /* dispose of the pwm */
1951 : 0 : if (panel->backlight.pwm)
1952 : : pwm_put(panel->backlight.pwm);
1953 : :
1954 : 0 : panel->backlight.present = false;
1955 : : }
1956 : :
1957 : : /* Set up chip specific backlight functions */
1958 : : static void
1959 : 0 : intel_panel_init_backlight_funcs(struct intel_panel *panel)
1960 : : {
1961 : 0 : struct intel_connector *connector =
1962 : 0 : container_of(panel, struct intel_connector, panel);
1963 [ # # ]: 0 : struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1964 : :
1965 [ # # # # ]: 0 : if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
1966 : 0 : intel_dp_aux_init_backlight_funcs(connector) == 0)
1967 : : return;
1968 : :
1969 [ # # # # ]: 0 : if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1970 : 0 : intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1971 : : return;
1972 : :
1973 [ # # # # ]: 0 : if (IS_GEN9_LP(dev_priv)) {
1974 : 0 : panel->backlight.setup = bxt_setup_backlight;
1975 : 0 : panel->backlight.enable = bxt_enable_backlight;
1976 : 0 : panel->backlight.disable = bxt_disable_backlight;
1977 : 0 : panel->backlight.set = bxt_set_backlight;
1978 : 0 : panel->backlight.get = bxt_get_backlight;
1979 : 0 : panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
1980 [ # # ]: 0 : } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) {
1981 : 0 : panel->backlight.setup = cnp_setup_backlight;
1982 : 0 : panel->backlight.enable = cnp_enable_backlight;
1983 : 0 : panel->backlight.disable = cnp_disable_backlight;
1984 : 0 : panel->backlight.set = bxt_set_backlight;
1985 : 0 : panel->backlight.get = bxt_get_backlight;
1986 : 0 : panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
1987 [ # # ]: 0 : } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) {
1988 : 0 : panel->backlight.setup = lpt_setup_backlight;
1989 : 0 : panel->backlight.enable = lpt_enable_backlight;
1990 : 0 : panel->backlight.disable = lpt_disable_backlight;
1991 : 0 : panel->backlight.set = lpt_set_backlight;
1992 : 0 : panel->backlight.get = lpt_get_backlight;
1993 [ # # ]: 0 : if (HAS_PCH_LPT(dev_priv))
1994 : 0 : panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1995 : : else
1996 : 0 : panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1997 [ # # ]: 0 : } else if (HAS_PCH_SPLIT(dev_priv)) {
1998 : 0 : panel->backlight.setup = pch_setup_backlight;
1999 : 0 : panel->backlight.enable = pch_enable_backlight;
2000 : 0 : panel->backlight.disable = pch_disable_backlight;
2001 : 0 : panel->backlight.set = pch_set_backlight;
2002 : 0 : panel->backlight.get = pch_get_backlight;
2003 : 0 : panel->backlight.hz_to_pwm = pch_hz_to_pwm;
2004 [ # # # # ]: 0 : } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
2005 [ # # ]: 0 : if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
2006 : 0 : panel->backlight.setup = pwm_setup_backlight;
2007 : 0 : panel->backlight.enable = pwm_enable_backlight;
2008 : 0 : panel->backlight.disable = pwm_disable_backlight;
2009 : 0 : panel->backlight.set = pwm_set_backlight;
2010 : 0 : panel->backlight.get = pwm_get_backlight;
2011 : : } else {
2012 : 0 : panel->backlight.setup = vlv_setup_backlight;
2013 : 0 : panel->backlight.enable = vlv_enable_backlight;
2014 : 0 : panel->backlight.disable = vlv_disable_backlight;
2015 : 0 : panel->backlight.set = vlv_set_backlight;
2016 : 0 : panel->backlight.get = vlv_get_backlight;
2017 : 0 : panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
2018 : : }
2019 [ # # ]: 0 : } else if (IS_GEN(dev_priv, 4)) {
2020 : 0 : panel->backlight.setup = i965_setup_backlight;
2021 : 0 : panel->backlight.enable = i965_enable_backlight;
2022 : 0 : panel->backlight.disable = i965_disable_backlight;
2023 : 0 : panel->backlight.set = i9xx_set_backlight;
2024 : 0 : panel->backlight.get = i9xx_get_backlight;
2025 : 0 : panel->backlight.hz_to_pwm = i965_hz_to_pwm;
2026 : : } else {
2027 : 0 : panel->backlight.setup = i9xx_setup_backlight;
2028 : 0 : panel->backlight.enable = i9xx_enable_backlight;
2029 : 0 : panel->backlight.disable = i9xx_disable_backlight;
2030 : 0 : panel->backlight.set = i9xx_set_backlight;
2031 : 0 : panel->backlight.get = i9xx_get_backlight;
2032 : 0 : panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
2033 : : }
2034 : : }
2035 : :
2036 : 0 : int intel_panel_init(struct intel_panel *panel,
2037 : : struct drm_display_mode *fixed_mode,
2038 : : struct drm_display_mode *downclock_mode)
2039 : : {
2040 : 0 : intel_panel_init_backlight_funcs(panel);
2041 : :
2042 : 0 : panel->fixed_mode = fixed_mode;
2043 : 0 : panel->downclock_mode = downclock_mode;
2044 : :
2045 : 0 : return 0;
2046 : : }
2047 : :
2048 : 0 : void intel_panel_fini(struct intel_panel *panel)
2049 : : {
2050 : 0 : struct intel_connector *intel_connector =
2051 : 0 : container_of(panel, struct intel_connector, panel);
2052 : :
2053 : 0 : intel_panel_destroy_backlight(panel);
2054 : :
2055 [ # # ]: 0 : if (panel->fixed_mode)
2056 : 0 : drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
2057 : :
2058 [ # # ]: 0 : if (panel->downclock_mode)
2059 : 0 : drm_mode_destroy(intel_connector->base.dev,
2060 : : panel->downclock_mode);
2061 : 0 : }
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