2 * Copyright © 2006-2010 Intel Corporation
3 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
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:
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
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.
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>
31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33 #include <linux/kernel.h>
34 #include <linux/moduleparam.h>
35 #include <linux/pwm.h>
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"
44 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
45 struct drm_display_mode *adjusted_mode)
47 drm_mode_copy(adjusted_mode, fixed_mode);
49 drm_mode_set_crtcinfo(adjusted_mode, 0);
52 static bool is_downclock_mode(const struct drm_display_mode *downclock_mode,
53 const struct drm_display_mode *fixed_mode)
55 return drm_mode_match(downclock_mode, fixed_mode,
56 DRM_MODE_MATCH_TIMINGS |
57 DRM_MODE_MATCH_FLAGS |
58 DRM_MODE_MATCH_3D_FLAGS) &&
59 downclock_mode->clock < fixed_mode->clock;
62 struct drm_display_mode *
63 intel_panel_edid_downclock_mode(struct intel_connector *connector,
64 const struct drm_display_mode *fixed_mode)
66 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
67 const struct drm_display_mode *scan, *best_mode = NULL;
68 struct drm_display_mode *downclock_mode;
69 int best_clock = fixed_mode->clock;
71 list_for_each_entry(scan, &connector->base.probed_modes, head) {
73 * If one mode has the same resolution with the fixed_panel
74 * mode while they have the different refresh rate, it means
75 * that the reduced downclock is found. In such
76 * case we can set the different FPx0/1 to dynamically select
77 * between low and high frequency.
79 if (is_downclock_mode(scan, fixed_mode) &&
80 scan->clock < best_clock) {
82 * The downclock is already found. But we
83 * expect to find the lower downclock.
85 best_clock = scan->clock;
93 downclock_mode = drm_mode_duplicate(&dev_priv->drm, best_mode);
97 drm_dbg_kms(&dev_priv->drm,
98 "[CONNECTOR:%d:%s] using downclock mode from EDID: ",
99 connector->base.base.id, connector->base.name);
100 drm_mode_debug_printmodeline(downclock_mode);
102 return downclock_mode;
105 struct drm_display_mode *
106 intel_panel_edid_fixed_mode(struct intel_connector *connector)
108 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
109 const struct drm_display_mode *scan;
110 struct drm_display_mode *fixed_mode;
112 if (list_empty(&connector->base.probed_modes))
115 /* prefer fixed mode from EDID if available */
116 list_for_each_entry(scan, &connector->base.probed_modes, head) {
117 if ((scan->type & DRM_MODE_TYPE_PREFERRED) == 0)
120 fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
124 drm_dbg_kms(&dev_priv->drm,
125 "[CONNECTOR:%d:%s] using preferred mode from EDID: ",
126 connector->base.base.id, connector->base.name);
127 drm_mode_debug_printmodeline(fixed_mode);
132 scan = list_first_entry(&connector->base.probed_modes,
133 typeof(*scan), head);
135 fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
139 fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
141 drm_dbg_kms(&dev_priv->drm,
142 "[CONNECTOR:%d:%s] using first mode from EDID: ",
143 connector->base.base.id, connector->base.name);
144 drm_mode_debug_printmodeline(fixed_mode);
149 struct drm_display_mode *
150 intel_panel_vbt_fixed_mode(struct intel_connector *connector)
152 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
153 struct drm_display_info *info = &connector->base.display_info;
154 struct drm_display_mode *fixed_mode;
156 if (!dev_priv->vbt.lfp_lvds_vbt_mode)
159 fixed_mode = drm_mode_duplicate(&dev_priv->drm,
160 dev_priv->vbt.lfp_lvds_vbt_mode);
164 fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
166 drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s] using mode from VBT: ",
167 connector->base.base.id, connector->base.name);
168 drm_mode_debug_printmodeline(fixed_mode);
170 info->width_mm = fixed_mode->width_mm;
171 info->height_mm = fixed_mode->height_mm;
176 /* adjusted_mode has been preset to be the panel's fixed mode */
177 int intel_pch_panel_fitting(struct intel_crtc_state *crtc_state,
178 const struct drm_connector_state *conn_state)
180 const struct drm_display_mode *adjusted_mode =
181 &crtc_state->hw.adjusted_mode;
182 int x, y, width, height;
184 /* Native modes don't need fitting */
185 if (adjusted_mode->crtc_hdisplay == crtc_state->pipe_src_w &&
186 adjusted_mode->crtc_vdisplay == crtc_state->pipe_src_h &&
187 crtc_state->output_format != INTEL_OUTPUT_FORMAT_YCBCR420)
190 switch (conn_state->scaling_mode) {
191 case DRM_MODE_SCALE_CENTER:
192 width = crtc_state->pipe_src_w;
193 height = crtc_state->pipe_src_h;
194 x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
195 y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
198 case DRM_MODE_SCALE_ASPECT:
199 /* Scale but preserve the aspect ratio */
201 u32 scaled_width = adjusted_mode->crtc_hdisplay
202 * crtc_state->pipe_src_h;
203 u32 scaled_height = crtc_state->pipe_src_w
204 * adjusted_mode->crtc_vdisplay;
205 if (scaled_width > scaled_height) { /* pillar */
206 width = scaled_height / crtc_state->pipe_src_h;
209 x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
211 height = adjusted_mode->crtc_vdisplay;
212 } else if (scaled_width < scaled_height) { /* letter */
213 height = scaled_width / crtc_state->pipe_src_w;
216 y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
218 width = adjusted_mode->crtc_hdisplay;
221 width = adjusted_mode->crtc_hdisplay;
222 height = adjusted_mode->crtc_vdisplay;
227 case DRM_MODE_SCALE_NONE:
228 WARN_ON(adjusted_mode->crtc_hdisplay != crtc_state->pipe_src_w);
229 WARN_ON(adjusted_mode->crtc_vdisplay != crtc_state->pipe_src_h);
231 case DRM_MODE_SCALE_FULLSCREEN:
233 width = adjusted_mode->crtc_hdisplay;
234 height = adjusted_mode->crtc_vdisplay;
238 MISSING_CASE(conn_state->scaling_mode);
242 drm_rect_init(&crtc_state->pch_pfit.dst,
243 x, y, width, height);
244 crtc_state->pch_pfit.enabled = true;
250 centre_horizontally(struct drm_display_mode *adjusted_mode,
253 u32 border, sync_pos, blank_width, sync_width;
255 /* keep the hsync and hblank widths constant */
256 sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
257 blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
258 sync_pos = (blank_width - sync_width + 1) / 2;
260 border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
261 border += border & 1; /* make the border even */
263 adjusted_mode->crtc_hdisplay = width;
264 adjusted_mode->crtc_hblank_start = width + border;
265 adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
267 adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
268 adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
272 centre_vertically(struct drm_display_mode *adjusted_mode,
275 u32 border, sync_pos, blank_width, sync_width;
277 /* keep the vsync and vblank widths constant */
278 sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
279 blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
280 sync_pos = (blank_width - sync_width + 1) / 2;
282 border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
284 adjusted_mode->crtc_vdisplay = height;
285 adjusted_mode->crtc_vblank_start = height + border;
286 adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
288 adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
289 adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
292 static u32 panel_fitter_scaling(u32 source, u32 target)
295 * Floating point operation is not supported. So the FACTOR
296 * is defined, which can avoid the floating point computation
297 * when calculating the panel ratio.
300 #define FACTOR (1 << ACCURACY)
301 u32 ratio = source * FACTOR / target;
302 return (FACTOR * ratio + FACTOR/2) / FACTOR;
305 static void i965_scale_aspect(struct intel_crtc_state *crtc_state,
308 const struct drm_display_mode *adjusted_mode =
309 &crtc_state->hw.adjusted_mode;
310 u32 scaled_width = adjusted_mode->crtc_hdisplay *
311 crtc_state->pipe_src_h;
312 u32 scaled_height = crtc_state->pipe_src_w *
313 adjusted_mode->crtc_vdisplay;
315 /* 965+ is easy, it does everything in hw */
316 if (scaled_width > scaled_height)
317 *pfit_control |= PFIT_ENABLE |
319 else if (scaled_width < scaled_height)
320 *pfit_control |= PFIT_ENABLE |
322 else if (adjusted_mode->crtc_hdisplay != crtc_state->pipe_src_w)
323 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
326 static void i9xx_scale_aspect(struct intel_crtc_state *crtc_state,
327 u32 *pfit_control, u32 *pfit_pgm_ratios,
330 struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
331 u32 scaled_width = adjusted_mode->crtc_hdisplay *
332 crtc_state->pipe_src_h;
333 u32 scaled_height = crtc_state->pipe_src_w *
334 adjusted_mode->crtc_vdisplay;
338 * For earlier chips we have to calculate the scaling
339 * ratio by hand and program it into the
340 * PFIT_PGM_RATIO register
342 if (scaled_width > scaled_height) { /* pillar */
343 centre_horizontally(adjusted_mode,
345 crtc_state->pipe_src_h);
347 *border = LVDS_BORDER_ENABLE;
348 if (crtc_state->pipe_src_h != adjusted_mode->crtc_vdisplay) {
349 bits = panel_fitter_scaling(crtc_state->pipe_src_h,
350 adjusted_mode->crtc_vdisplay);
352 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
353 bits << PFIT_VERT_SCALE_SHIFT);
354 *pfit_control |= (PFIT_ENABLE |
355 VERT_INTERP_BILINEAR |
356 HORIZ_INTERP_BILINEAR);
358 } else if (scaled_width < scaled_height) { /* letter */
359 centre_vertically(adjusted_mode,
361 crtc_state->pipe_src_w);
363 *border = LVDS_BORDER_ENABLE;
364 if (crtc_state->pipe_src_w != adjusted_mode->crtc_hdisplay) {
365 bits = panel_fitter_scaling(crtc_state->pipe_src_w,
366 adjusted_mode->crtc_hdisplay);
368 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
369 bits << PFIT_VERT_SCALE_SHIFT);
370 *pfit_control |= (PFIT_ENABLE |
371 VERT_INTERP_BILINEAR |
372 HORIZ_INTERP_BILINEAR);
375 /* Aspects match, Let hw scale both directions */
376 *pfit_control |= (PFIT_ENABLE |
377 VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
378 VERT_INTERP_BILINEAR |
379 HORIZ_INTERP_BILINEAR);
383 int intel_gmch_panel_fitting(struct intel_crtc_state *crtc_state,
384 const struct drm_connector_state *conn_state)
386 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
387 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
388 u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
389 struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
391 /* Native modes don't need fitting */
392 if (adjusted_mode->crtc_hdisplay == crtc_state->pipe_src_w &&
393 adjusted_mode->crtc_vdisplay == crtc_state->pipe_src_h)
396 switch (conn_state->scaling_mode) {
397 case DRM_MODE_SCALE_CENTER:
399 * For centered modes, we have to calculate border widths &
400 * heights and modify the values programmed into the CRTC.
402 centre_horizontally(adjusted_mode, crtc_state->pipe_src_w);
403 centre_vertically(adjusted_mode, crtc_state->pipe_src_h);
404 border = LVDS_BORDER_ENABLE;
406 case DRM_MODE_SCALE_ASPECT:
407 /* Scale but preserve the aspect ratio */
408 if (INTEL_GEN(dev_priv) >= 4)
409 i965_scale_aspect(crtc_state, &pfit_control);
411 i9xx_scale_aspect(crtc_state, &pfit_control,
412 &pfit_pgm_ratios, &border);
414 case DRM_MODE_SCALE_FULLSCREEN:
416 * Full scaling, even if it changes the aspect ratio.
417 * Fortunately this is all done for us in hw.
419 if (crtc_state->pipe_src_h != adjusted_mode->crtc_vdisplay ||
420 crtc_state->pipe_src_w != adjusted_mode->crtc_hdisplay) {
421 pfit_control |= PFIT_ENABLE;
422 if (INTEL_GEN(dev_priv) >= 4)
423 pfit_control |= PFIT_SCALING_AUTO;
425 pfit_control |= (VERT_AUTO_SCALE |
426 VERT_INTERP_BILINEAR |
428 HORIZ_INTERP_BILINEAR);
432 MISSING_CASE(conn_state->scaling_mode);
436 /* 965+ wants fuzzy fitting */
437 /* FIXME: handle multiple panels by failing gracefully */
438 if (INTEL_GEN(dev_priv) >= 4)
439 pfit_control |= PFIT_PIPE(crtc->pipe) | PFIT_FILTER_FUZZY;
442 if ((pfit_control & PFIT_ENABLE) == 0) {
447 /* Make sure pre-965 set dither correctly for 18bpp panels. */
448 if (INTEL_GEN(dev_priv) < 4 && crtc_state->pipe_bpp == 18)
449 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
451 crtc_state->gmch_pfit.control = pfit_control;
452 crtc_state->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
453 crtc_state->gmch_pfit.lvds_border_bits = border;
459 * scale - scale values from one range to another
460 * @source_val: value in range [@source_min..@source_max]
461 * @source_min: minimum legal value for @source_val
462 * @source_max: maximum legal value for @source_val
463 * @target_min: corresponding target value for @source_min
464 * @target_max: corresponding target value for @source_max
466 * Return @source_val in range [@source_min..@source_max] scaled to range
467 * [@target_min..@target_max].
469 static u32 scale(u32 source_val,
470 u32 source_min, u32 source_max,
471 u32 target_min, u32 target_max)
475 WARN_ON(source_min > source_max);
476 WARN_ON(target_min > target_max);
479 source_val = clamp(source_val, source_min, source_max);
481 /* avoid overflows */
482 target_val = mul_u32_u32(source_val - source_min,
483 target_max - target_min);
484 target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
485 target_val += target_min;
490 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
491 * to [hw_min..hw_max]. */
492 static u32 clamp_user_to_hw(struct intel_connector *connector,
493 u32 user_level, u32 user_max)
495 struct intel_panel *panel = &connector->panel;
498 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
499 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
504 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
505 static u32 scale_hw_to_user(struct intel_connector *connector,
506 u32 hw_level, u32 user_max)
508 struct intel_panel *panel = &connector->panel;
510 return scale(hw_level, panel->backlight.min, panel->backlight.max,
514 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
517 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
518 struct intel_panel *panel = &connector->panel;
520 drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
522 if (dev_priv->params.invert_brightness < 0)
525 if (dev_priv->params.invert_brightness > 0 ||
526 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
527 return panel->backlight.max - val + panel->backlight.min;
533 static u32 lpt_get_backlight(struct intel_connector *connector)
535 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
537 return intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
540 static u32 pch_get_backlight(struct intel_connector *connector)
542 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
544 return intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
547 static u32 i9xx_get_backlight(struct intel_connector *connector)
549 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
550 struct intel_panel *panel = &connector->panel;
553 val = intel_de_read(dev_priv, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
554 if (INTEL_GEN(dev_priv) < 4)
557 if (panel->backlight.combination_mode) {
560 pci_read_config_byte(dev_priv->drm.pdev, LBPC, &lbpc);
567 static u32 _vlv_get_backlight(struct drm_i915_private *dev_priv, enum pipe pipe)
569 if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
572 return intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
575 static u32 vlv_get_backlight(struct intel_connector *connector)
577 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
578 enum pipe pipe = intel_connector_get_pipe(connector);
580 return _vlv_get_backlight(dev_priv, pipe);
583 static u32 bxt_get_backlight(struct intel_connector *connector)
585 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
586 struct intel_panel *panel = &connector->panel;
588 return intel_de_read(dev_priv,
589 BXT_BLC_PWM_DUTY(panel->backlight.controller));
592 static u32 pwm_get_backlight(struct intel_connector *connector)
594 struct intel_panel *panel = &connector->panel;
597 duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
598 return DIV_ROUND_UP(duty_ns * 100, panel->backlight.pwm_period_ns);
601 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
603 struct intel_connector *connector = to_intel_connector(conn_state->connector);
604 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
606 u32 val = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
607 intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, val | level);
610 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
612 struct intel_connector *connector = to_intel_connector(conn_state->connector);
613 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
616 tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
617 intel_de_write(dev_priv, BLC_PWM_CPU_CTL, tmp | level);
620 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
622 struct intel_connector *connector = to_intel_connector(conn_state->connector);
623 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
624 struct intel_panel *panel = &connector->panel;
627 drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
629 if (panel->backlight.combination_mode) {
632 lbpc = level * 0xfe / panel->backlight.max + 1;
634 pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
637 if (IS_GEN(dev_priv, 4)) {
638 mask = BACKLIGHT_DUTY_CYCLE_MASK;
641 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
644 tmp = intel_de_read(dev_priv, BLC_PWM_CTL) & ~mask;
645 intel_de_write(dev_priv, BLC_PWM_CTL, tmp | level);
648 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
650 struct intel_connector *connector = to_intel_connector(conn_state->connector);
651 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
652 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
655 tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
656 intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), tmp | level);
659 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
661 struct intel_connector *connector = to_intel_connector(conn_state->connector);
662 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
663 struct intel_panel *panel = &connector->panel;
665 intel_de_write(dev_priv,
666 BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
669 static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
671 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
672 int duty_ns = DIV_ROUND_UP(level * panel->backlight.pwm_period_ns, 100);
674 pwm_config(panel->backlight.pwm, duty_ns,
675 panel->backlight.pwm_period_ns);
679 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
681 struct intel_connector *connector = to_intel_connector(conn_state->connector);
682 struct drm_i915_private *i915 = to_i915(connector->base.dev);
683 struct intel_panel *panel = &connector->panel;
685 drm_dbg_kms(&i915->drm, "set backlight PWM = %d\n", level);
687 level = intel_panel_compute_brightness(connector, level);
688 panel->backlight.set(conn_state, level);
691 /* set backlight brightness to level in range [0..max], assuming hw min is
694 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
695 u32 user_level, u32 user_max)
697 struct intel_connector *connector = to_intel_connector(conn_state->connector);
698 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
699 struct intel_panel *panel = &connector->panel;
703 * Lack of crtc may occur during driver init because
704 * connection_mutex isn't held across the entire backlight
705 * setup + modeset readout, and the BIOS can issue the
706 * requests at any time.
708 if (!panel->backlight.present || !conn_state->crtc)
711 mutex_lock(&dev_priv->backlight_lock);
713 drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
715 hw_level = clamp_user_to_hw(connector, user_level, user_max);
716 panel->backlight.level = hw_level;
718 if (panel->backlight.device)
719 panel->backlight.device->props.brightness =
720 scale_hw_to_user(connector,
721 panel->backlight.level,
722 panel->backlight.device->props.max_brightness);
724 if (panel->backlight.enabled)
725 intel_panel_actually_set_backlight(conn_state, hw_level);
727 mutex_unlock(&dev_priv->backlight_lock);
730 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state)
732 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
733 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
736 intel_panel_actually_set_backlight(old_conn_state, 0);
739 * Although we don't support or enable CPU PWM with LPT/SPT based
740 * systems, it may have been enabled prior to loading the
741 * driver. Disable to avoid warnings on LCPLL disable.
743 * This needs rework if we need to add support for CPU PWM on PCH split
746 tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
747 if (tmp & BLM_PWM_ENABLE) {
748 drm_dbg_kms(&dev_priv->drm,
749 "cpu backlight was enabled, disabling\n");
750 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
751 tmp & ~BLM_PWM_ENABLE);
754 tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
755 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
758 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state)
760 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
761 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
764 intel_panel_actually_set_backlight(old_conn_state, 0);
766 tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
767 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
769 tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
770 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
773 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state)
775 intel_panel_actually_set_backlight(old_conn_state, 0);
778 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
780 struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
783 intel_panel_actually_set_backlight(old_conn_state, 0);
785 tmp = intel_de_read(dev_priv, BLC_PWM_CTL2);
786 intel_de_write(dev_priv, BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
789 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state)
791 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
792 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
793 enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
796 intel_panel_actually_set_backlight(old_conn_state, 0);
798 tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
799 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
800 tmp & ~BLM_PWM_ENABLE);
803 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state)
805 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
806 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
807 struct intel_panel *panel = &connector->panel;
810 intel_panel_actually_set_backlight(old_conn_state, 0);
812 tmp = intel_de_read(dev_priv,
813 BXT_BLC_PWM_CTL(panel->backlight.controller));
814 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
815 tmp & ~BXT_BLC_PWM_ENABLE);
817 if (panel->backlight.controller == 1) {
818 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
819 val &= ~UTIL_PIN_ENABLE;
820 intel_de_write(dev_priv, UTIL_PIN_CTL, val);
824 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state)
826 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
827 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
828 struct intel_panel *panel = &connector->panel;
831 intel_panel_actually_set_backlight(old_conn_state, 0);
833 tmp = intel_de_read(dev_priv,
834 BXT_BLC_PWM_CTL(panel->backlight.controller));
835 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
836 tmp & ~BXT_BLC_PWM_ENABLE);
839 static void pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
841 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
842 struct intel_panel *panel = &connector->panel;
844 /* Disable the backlight */
845 intel_panel_actually_set_backlight(old_conn_state, 0);
846 usleep_range(2000, 3000);
847 pwm_disable(panel->backlight.pwm);
850 void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
852 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
853 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
854 struct intel_panel *panel = &connector->panel;
856 if (!panel->backlight.present)
860 * Do not disable backlight on the vga_switcheroo path. When switching
861 * away from i915, the other client may depend on i915 to handle the
862 * backlight. This will leave the backlight on unnecessarily when
863 * another client is not activated.
865 if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
866 drm_dbg_kms(&dev_priv->drm,
867 "Skipping backlight disable on vga switch\n");
871 mutex_lock(&dev_priv->backlight_lock);
873 if (panel->backlight.device)
874 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
875 panel->backlight.enabled = false;
876 panel->backlight.disable(old_conn_state);
878 mutex_unlock(&dev_priv->backlight_lock);
881 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
882 const struct drm_connector_state *conn_state)
884 struct intel_connector *connector = to_intel_connector(conn_state->connector);
885 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
886 struct intel_panel *panel = &connector->panel;
887 u32 pch_ctl1, pch_ctl2, schicken;
889 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
890 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
891 drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
892 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
893 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
896 if (HAS_PCH_LPT(dev_priv)) {
897 schicken = intel_de_read(dev_priv, SOUTH_CHICKEN2);
898 if (panel->backlight.alternate_pwm_increment)
899 schicken |= LPT_PWM_GRANULARITY;
901 schicken &= ~LPT_PWM_GRANULARITY;
902 intel_de_write(dev_priv, SOUTH_CHICKEN2, schicken);
904 schicken = intel_de_read(dev_priv, SOUTH_CHICKEN1);
905 if (panel->backlight.alternate_pwm_increment)
906 schicken |= SPT_PWM_GRANULARITY;
908 schicken &= ~SPT_PWM_GRANULARITY;
909 intel_de_write(dev_priv, SOUTH_CHICKEN1, schicken);
912 pch_ctl2 = panel->backlight.max << 16;
913 intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
916 if (panel->backlight.active_low_pwm)
917 pch_ctl1 |= BLM_PCH_POLARITY;
919 /* After LPT, override is the default. */
920 if (HAS_PCH_LPT(dev_priv))
921 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
923 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
924 intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
925 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
926 pch_ctl1 | BLM_PCH_PWM_ENABLE);
928 /* This won't stick until the above enable. */
929 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
932 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
933 const struct drm_connector_state *conn_state)
935 struct intel_connector *connector = to_intel_connector(conn_state->connector);
936 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
937 struct intel_panel *panel = &connector->panel;
938 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
939 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
941 cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
942 if (cpu_ctl2 & BLM_PWM_ENABLE) {
943 drm_dbg_kms(&dev_priv->drm, "cpu backlight already enabled\n");
944 cpu_ctl2 &= ~BLM_PWM_ENABLE;
945 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
948 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
949 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
950 drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
951 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
952 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
955 if (cpu_transcoder == TRANSCODER_EDP)
956 cpu_ctl2 = BLM_TRANSCODER_EDP;
958 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
959 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
960 intel_de_posting_read(dev_priv, BLC_PWM_CPU_CTL2);
961 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
963 /* This won't stick until the above enable. */
964 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
966 pch_ctl2 = panel->backlight.max << 16;
967 intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
970 if (panel->backlight.active_low_pwm)
971 pch_ctl1 |= BLM_PCH_POLARITY;
973 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
974 intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
975 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
976 pch_ctl1 | BLM_PCH_PWM_ENABLE);
979 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
980 const struct drm_connector_state *conn_state)
982 struct intel_connector *connector = to_intel_connector(conn_state->connector);
983 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
984 struct intel_panel *panel = &connector->panel;
987 ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
988 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
989 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
990 intel_de_write(dev_priv, BLC_PWM_CTL, 0);
993 freq = panel->backlight.max;
994 if (panel->backlight.combination_mode)
998 if (panel->backlight.combination_mode)
999 ctl |= BLM_LEGACY_MODE;
1000 if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
1001 ctl |= BLM_POLARITY_PNV;
1003 intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
1004 intel_de_posting_read(dev_priv, BLC_PWM_CTL);
1006 /* XXX: combine this into above write? */
1007 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1010 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
1011 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
1012 * that has backlight.
1014 if (IS_GEN(dev_priv, 2))
1015 intel_de_write(dev_priv, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
1018 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
1019 const struct drm_connector_state *conn_state)
1021 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1022 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1023 struct intel_panel *panel = &connector->panel;
1024 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
1025 u32 ctl, ctl2, freq;
1027 ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
1028 if (ctl2 & BLM_PWM_ENABLE) {
1029 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1030 ctl2 &= ~BLM_PWM_ENABLE;
1031 intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
1034 freq = panel->backlight.max;
1035 if (panel->backlight.combination_mode)
1039 intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
1041 ctl2 = BLM_PIPE(pipe);
1042 if (panel->backlight.combination_mode)
1043 ctl2 |= BLM_COMBINATION_MODE;
1044 if (panel->backlight.active_low_pwm)
1045 ctl2 |= BLM_POLARITY_I965;
1046 intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
1047 intel_de_posting_read(dev_priv, BLC_PWM_CTL2);
1048 intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1050 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1053 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1054 const struct drm_connector_state *conn_state)
1056 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1057 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1058 struct intel_panel *panel = &connector->panel;
1059 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1062 ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1063 if (ctl2 & BLM_PWM_ENABLE) {
1064 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1065 ctl2 &= ~BLM_PWM_ENABLE;
1066 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
1069 ctl = panel->backlight.max << 16;
1070 intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), ctl);
1072 /* XXX: combine this into above write? */
1073 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1076 if (panel->backlight.active_low_pwm)
1077 ctl2 |= BLM_POLARITY_I965;
1078 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
1079 intel_de_posting_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1080 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
1081 ctl2 | BLM_PWM_ENABLE);
1084 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1085 const struct drm_connector_state *conn_state)
1087 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1088 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1089 struct intel_panel *panel = &connector->panel;
1090 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1093 /* Controller 1 uses the utility pin. */
1094 if (panel->backlight.controller == 1) {
1095 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
1096 if (val & UTIL_PIN_ENABLE) {
1097 drm_dbg_kms(&dev_priv->drm,
1098 "util pin already enabled\n");
1099 val &= ~UTIL_PIN_ENABLE;
1100 intel_de_write(dev_priv, UTIL_PIN_CTL, val);
1104 if (panel->backlight.util_pin_active_low)
1105 val |= UTIL_PIN_POLARITY;
1106 intel_de_write(dev_priv, UTIL_PIN_CTL,
1107 val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1110 pwm_ctl = intel_de_read(dev_priv,
1111 BXT_BLC_PWM_CTL(panel->backlight.controller));
1112 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1113 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1114 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1115 intel_de_write(dev_priv,
1116 BXT_BLC_PWM_CTL(panel->backlight.controller),
1120 intel_de_write(dev_priv,
1121 BXT_BLC_PWM_FREQ(panel->backlight.controller),
1122 panel->backlight.max);
1124 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1127 if (panel->backlight.active_low_pwm)
1128 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1130 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1132 intel_de_posting_read(dev_priv,
1133 BXT_BLC_PWM_CTL(panel->backlight.controller));
1134 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1135 pwm_ctl | BXT_BLC_PWM_ENABLE);
1138 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1139 const struct drm_connector_state *conn_state)
1141 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1142 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1143 struct intel_panel *panel = &connector->panel;
1146 pwm_ctl = intel_de_read(dev_priv,
1147 BXT_BLC_PWM_CTL(panel->backlight.controller));
1148 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1149 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1150 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1151 intel_de_write(dev_priv,
1152 BXT_BLC_PWM_CTL(panel->backlight.controller),
1156 intel_de_write(dev_priv,
1157 BXT_BLC_PWM_FREQ(panel->backlight.controller),
1158 panel->backlight.max);
1160 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1163 if (panel->backlight.active_low_pwm)
1164 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1166 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1168 intel_de_posting_read(dev_priv,
1169 BXT_BLC_PWM_CTL(panel->backlight.controller));
1170 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1171 pwm_ctl | BXT_BLC_PWM_ENABLE);
1174 static void pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1175 const struct drm_connector_state *conn_state)
1177 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1178 struct intel_panel *panel = &connector->panel;
1180 pwm_enable(panel->backlight.pwm);
1181 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1184 static void __intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1185 const struct drm_connector_state *conn_state)
1187 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1188 struct intel_panel *panel = &connector->panel;
1190 WARN_ON(panel->backlight.max == 0);
1192 if (panel->backlight.level <= panel->backlight.min) {
1193 panel->backlight.level = panel->backlight.max;
1194 if (panel->backlight.device)
1195 panel->backlight.device->props.brightness =
1196 scale_hw_to_user(connector,
1197 panel->backlight.level,
1198 panel->backlight.device->props.max_brightness);
1201 panel->backlight.enable(crtc_state, conn_state);
1202 panel->backlight.enabled = true;
1203 if (panel->backlight.device)
1204 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1207 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1208 const struct drm_connector_state *conn_state)
1210 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1211 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1212 struct intel_panel *panel = &connector->panel;
1213 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1215 if (!panel->backlight.present)
1218 drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(pipe));
1220 mutex_lock(&dev_priv->backlight_lock);
1222 __intel_panel_enable_backlight(crtc_state, conn_state);
1224 mutex_unlock(&dev_priv->backlight_lock);
1227 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1228 static u32 intel_panel_get_backlight(struct intel_connector *connector)
1230 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1231 struct intel_panel *panel = &connector->panel;
1234 mutex_lock(&dev_priv->backlight_lock);
1236 if (panel->backlight.enabled) {
1237 val = panel->backlight.get(connector);
1238 val = intel_panel_compute_brightness(connector, val);
1241 mutex_unlock(&dev_priv->backlight_lock);
1243 drm_dbg_kms(&dev_priv->drm, "get backlight PWM = %d\n", val);
1247 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
1248 static u32 scale_user_to_hw(struct intel_connector *connector,
1249 u32 user_level, u32 user_max)
1251 struct intel_panel *panel = &connector->panel;
1253 return scale(user_level, 0, user_max,
1254 panel->backlight.min, panel->backlight.max);
1257 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
1258 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
1259 u32 user_level, u32 user_max)
1261 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1262 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1263 struct intel_panel *panel = &connector->panel;
1266 if (!panel->backlight.present)
1269 mutex_lock(&dev_priv->backlight_lock);
1271 drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
1273 hw_level = scale_user_to_hw(connector, user_level, user_max);
1274 panel->backlight.level = hw_level;
1276 if (panel->backlight.enabled)
1277 intel_panel_actually_set_backlight(conn_state, hw_level);
1279 mutex_unlock(&dev_priv->backlight_lock);
1282 static int intel_backlight_device_update_status(struct backlight_device *bd)
1284 struct intel_connector *connector = bl_get_data(bd);
1285 struct intel_panel *panel = &connector->panel;
1286 struct drm_device *dev = connector->base.dev;
1288 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1289 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1290 bd->props.brightness, bd->props.max_brightness);
1291 intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1292 bd->props.max_brightness);
1295 * Allow flipping bl_power as a sub-state of enabled. Sadly the
1296 * backlight class device does not make it easy to to differentiate
1297 * between callbacks for brightness and bl_power, so our backlight_power
1298 * callback needs to take this into account.
1300 if (panel->backlight.enabled) {
1301 if (panel->backlight.power) {
1302 bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1303 bd->props.brightness != 0;
1304 panel->backlight.power(connector, enable);
1307 bd->props.power = FB_BLANK_POWERDOWN;
1310 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1314 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1316 struct intel_connector *connector = bl_get_data(bd);
1317 struct drm_device *dev = connector->base.dev;
1318 struct drm_i915_private *dev_priv = to_i915(dev);
1319 intel_wakeref_t wakeref;
1322 with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
1325 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1327 hw_level = intel_panel_get_backlight(connector);
1328 ret = scale_hw_to_user(connector,
1329 hw_level, bd->props.max_brightness);
1331 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1337 static const struct backlight_ops intel_backlight_device_ops = {
1338 .update_status = intel_backlight_device_update_status,
1339 .get_brightness = intel_backlight_device_get_brightness,
1342 int intel_backlight_device_register(struct intel_connector *connector)
1344 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1345 struct intel_panel *panel = &connector->panel;
1346 struct backlight_properties props;
1348 if (WARN_ON(panel->backlight.device))
1351 if (!panel->backlight.present)
1354 WARN_ON(panel->backlight.max == 0);
1356 memset(&props, 0, sizeof(props));
1357 props.type = BACKLIGHT_RAW;
1360 * Note: Everything should work even if the backlight device max
1361 * presented to the userspace is arbitrarily chosen.
1363 props.max_brightness = panel->backlight.max;
1364 props.brightness = scale_hw_to_user(connector,
1365 panel->backlight.level,
1366 props.max_brightness);
1368 if (panel->backlight.enabled)
1369 props.power = FB_BLANK_UNBLANK;
1371 props.power = FB_BLANK_POWERDOWN;
1374 * Note: using the same name independent of the connector prevents
1375 * registration of multiple backlight devices in the driver.
1377 panel->backlight.device =
1378 backlight_device_register("intel_backlight",
1379 connector->base.kdev,
1381 &intel_backlight_device_ops, &props);
1383 if (IS_ERR(panel->backlight.device)) {
1384 drm_err(&i915->drm, "Failed to register backlight: %ld\n",
1385 PTR_ERR(panel->backlight.device));
1386 panel->backlight.device = NULL;
1390 drm_dbg_kms(&i915->drm,
1391 "Connector %s backlight sysfs interface registered\n",
1392 connector->base.name);
1397 void intel_backlight_device_unregister(struct intel_connector *connector)
1399 struct intel_panel *panel = &connector->panel;
1401 if (panel->backlight.device) {
1402 backlight_device_unregister(panel->backlight.device);
1403 panel->backlight.device = NULL;
1406 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1409 * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1412 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1414 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1416 return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1421 * BXT: PWM clock frequency = 19.2 MHz.
1423 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1425 return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1429 * SPT: This value represents the period of the PWM stream in clock periods
1430 * multiplied by 16 (default increment) or 128 (alternate increment selected in
1431 * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1433 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1435 struct intel_panel *panel = &connector->panel;
1438 if (panel->backlight.alternate_pwm_increment)
1443 return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1447 * LPT: This value represents the period of the PWM stream in clock periods
1448 * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1449 * LPT SOUTH_CHICKEN2 register bit 5).
1451 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1453 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1454 struct intel_panel *panel = &connector->panel;
1457 if (panel->backlight.alternate_pwm_increment)
1462 if (HAS_PCH_LPT_H(dev_priv))
1463 clock = MHz(135); /* LPT:H */
1465 clock = MHz(24); /* LPT:LP */
1467 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1471 * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1472 * display raw clocks multiplied by 128.
1474 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1476 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1478 return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1483 * Gen2: This field determines the number of time base events (display core
1484 * clock frequency/32) in total for a complete cycle of modulated backlight
1487 * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1490 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1492 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1495 if (IS_PINEVIEW(dev_priv))
1496 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1498 clock = KHz(dev_priv->cdclk.hw.cdclk);
1500 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1504 * Gen4: This value represents the period of the PWM stream in display core
1505 * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1508 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1510 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1513 if (IS_G4X(dev_priv))
1514 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1516 clock = KHz(dev_priv->cdclk.hw.cdclk);
1518 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1522 * VLV: This value represents the period of the PWM stream in display core
1523 * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1524 * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1526 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1528 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1531 if ((intel_de_read(dev_priv, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1532 if (IS_CHERRYVIEW(dev_priv))
1538 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1542 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1545 static u16 get_vbt_pwm_freq(struct drm_i915_private *dev_priv)
1547 u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1550 drm_dbg_kms(&dev_priv->drm,
1551 "VBT defined backlight frequency %u Hz\n",
1555 drm_dbg_kms(&dev_priv->drm,
1556 "default backlight frequency %u Hz\n",
1563 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1565 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1566 struct intel_panel *panel = &connector->panel;
1567 u16 pwm_freq_hz = get_vbt_pwm_freq(dev_priv);
1570 if (!panel->backlight.hz_to_pwm) {
1571 drm_dbg_kms(&dev_priv->drm,
1572 "backlight frequency conversion not supported\n");
1576 pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1578 drm_dbg_kms(&dev_priv->drm,
1579 "backlight frequency conversion failed\n");
1587 * Note: The setup hooks can't assume pipe is set!
1589 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1591 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1592 struct intel_panel *panel = &connector->panel;
1595 drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
1598 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1599 * to problems. There are such machines out there. Either our
1600 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1601 * against this by letting the minimum be at most (arbitrarily chosen)
1604 min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1605 if (min != dev_priv->vbt.backlight.min_brightness) {
1606 drm_dbg_kms(&dev_priv->drm,
1607 "clamping VBT min backlight %d/255 to %d/255\n",
1608 dev_priv->vbt.backlight.min_brightness, min);
1611 /* vbt value is a coefficient in range [0..255] */
1612 return scale(min, 0, 255, 0, panel->backlight.max);
1615 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1617 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1618 struct intel_panel *panel = &connector->panel;
1619 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1622 if (HAS_PCH_LPT(dev_priv))
1623 alt = intel_de_read(dev_priv, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1625 alt = intel_de_read(dev_priv, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1626 panel->backlight.alternate_pwm_increment = alt;
1628 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
1629 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1631 pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
1632 panel->backlight.max = pch_ctl2 >> 16;
1634 cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
1636 if (!panel->backlight.max)
1637 panel->backlight.max = get_backlight_max_vbt(connector);
1639 if (!panel->backlight.max)
1642 panel->backlight.min = get_backlight_min_vbt(connector);
1644 panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1646 cpu_mode = panel->backlight.enabled && HAS_PCH_LPT(dev_priv) &&
1647 !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
1648 (cpu_ctl2 & BLM_PWM_ENABLE);
1650 val = pch_get_backlight(connector);
1652 val = lpt_get_backlight(connector);
1653 val = intel_panel_compute_brightness(connector, val);
1654 panel->backlight.level = clamp(val, panel->backlight.min,
1655 panel->backlight.max);
1658 drm_dbg_kms(&dev_priv->drm,
1659 "CPU backlight register was enabled, switching to PCH override\n");
1661 /* Write converted CPU PWM value to PCH override register */
1662 lpt_set_backlight(connector->base.state, panel->backlight.level);
1663 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
1664 pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
1666 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
1667 cpu_ctl2 & ~BLM_PWM_ENABLE);
1673 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1675 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1676 struct intel_panel *panel = &connector->panel;
1677 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1679 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
1680 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1682 pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
1683 panel->backlight.max = pch_ctl2 >> 16;
1685 if (!panel->backlight.max)
1686 panel->backlight.max = get_backlight_max_vbt(connector);
1688 if (!panel->backlight.max)
1691 panel->backlight.min = get_backlight_min_vbt(connector);
1693 val = pch_get_backlight(connector);
1694 val = intel_panel_compute_brightness(connector, val);
1695 panel->backlight.level = clamp(val, panel->backlight.min,
1696 panel->backlight.max);
1698 cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
1699 panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1700 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1705 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1707 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1708 struct intel_panel *panel = &connector->panel;
1711 ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1713 if (IS_GEN(dev_priv, 2) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1714 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1716 if (IS_PINEVIEW(dev_priv))
1717 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1719 panel->backlight.max = ctl >> 17;
1721 if (!panel->backlight.max) {
1722 panel->backlight.max = get_backlight_max_vbt(connector);
1723 panel->backlight.max >>= 1;
1726 if (!panel->backlight.max)
1729 if (panel->backlight.combination_mode)
1730 panel->backlight.max *= 0xff;
1732 panel->backlight.min = get_backlight_min_vbt(connector);
1734 val = i9xx_get_backlight(connector);
1735 val = intel_panel_compute_brightness(connector, val);
1736 panel->backlight.level = clamp(val, panel->backlight.min,
1737 panel->backlight.max);
1739 panel->backlight.enabled = val != 0;
1744 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1746 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1747 struct intel_panel *panel = &connector->panel;
1750 ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
1751 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1752 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1754 ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1755 panel->backlight.max = ctl >> 16;
1757 if (!panel->backlight.max)
1758 panel->backlight.max = get_backlight_max_vbt(connector);
1760 if (!panel->backlight.max)
1763 if (panel->backlight.combination_mode)
1764 panel->backlight.max *= 0xff;
1766 panel->backlight.min = get_backlight_min_vbt(connector);
1768 val = i9xx_get_backlight(connector);
1769 val = intel_panel_compute_brightness(connector, val);
1770 panel->backlight.level = clamp(val, panel->backlight.min,
1771 panel->backlight.max);
1773 panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1778 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1780 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1781 struct intel_panel *panel = &connector->panel;
1784 if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
1787 ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1788 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1790 ctl = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe));
1791 panel->backlight.max = ctl >> 16;
1793 if (!panel->backlight.max)
1794 panel->backlight.max = get_backlight_max_vbt(connector);
1796 if (!panel->backlight.max)
1799 panel->backlight.min = get_backlight_min_vbt(connector);
1801 val = _vlv_get_backlight(dev_priv, pipe);
1802 val = intel_panel_compute_brightness(connector, val);
1803 panel->backlight.level = clamp(val, panel->backlight.min,
1804 panel->backlight.max);
1806 panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1812 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1814 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1815 struct intel_panel *panel = &connector->panel;
1818 panel->backlight.controller = dev_priv->vbt.backlight.controller;
1820 pwm_ctl = intel_de_read(dev_priv,
1821 BXT_BLC_PWM_CTL(panel->backlight.controller));
1823 /* Controller 1 uses the utility pin. */
1824 if (panel->backlight.controller == 1) {
1825 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
1826 panel->backlight.util_pin_active_low =
1827 val & UTIL_PIN_POLARITY;
1830 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1831 panel->backlight.max =
1832 intel_de_read(dev_priv,
1833 BXT_BLC_PWM_FREQ(panel->backlight.controller));
1835 if (!panel->backlight.max)
1836 panel->backlight.max = get_backlight_max_vbt(connector);
1838 if (!panel->backlight.max)
1841 panel->backlight.min = get_backlight_min_vbt(connector);
1843 val = bxt_get_backlight(connector);
1844 val = intel_panel_compute_brightness(connector, val);
1845 panel->backlight.level = clamp(val, panel->backlight.min,
1846 panel->backlight.max);
1848 panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1854 cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1856 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1857 struct intel_panel *panel = &connector->panel;
1861 * CNP has the BXT implementation of backlight, but with only one
1862 * controller. TODO: ICP has multiple controllers but we only use
1863 * controller 0 for now.
1865 panel->backlight.controller = 0;
1867 pwm_ctl = intel_de_read(dev_priv,
1868 BXT_BLC_PWM_CTL(panel->backlight.controller));
1870 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1871 panel->backlight.max =
1872 intel_de_read(dev_priv,
1873 BXT_BLC_PWM_FREQ(panel->backlight.controller));
1875 if (!panel->backlight.max)
1876 panel->backlight.max = get_backlight_max_vbt(connector);
1878 if (!panel->backlight.max)
1881 panel->backlight.min = get_backlight_min_vbt(connector);
1883 val = bxt_get_backlight(connector);
1884 val = intel_panel_compute_brightness(connector, val);
1885 panel->backlight.level = clamp(val, panel->backlight.min,
1886 panel->backlight.max);
1888 panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1893 static int pwm_setup_backlight(struct intel_connector *connector,
1896 struct drm_device *dev = connector->base.dev;
1897 struct drm_i915_private *dev_priv = to_i915(dev);
1898 struct intel_panel *panel = &connector->panel;
1903 /* Get the right PWM chip for DSI backlight according to VBT */
1904 if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
1905 panel->backlight.pwm = pwm_get(dev->dev, "pwm_pmic_backlight");
1908 panel->backlight.pwm = pwm_get(dev->dev, "pwm_soc_backlight");
1912 if (IS_ERR(panel->backlight.pwm)) {
1913 drm_err(&dev_priv->drm, "Failed to get the %s PWM chip\n",
1915 panel->backlight.pwm = NULL;
1919 panel->backlight.pwm_period_ns = NSEC_PER_SEC /
1920 get_vbt_pwm_freq(dev_priv);
1923 * FIXME: pwm_apply_args() should be removed when switching to
1924 * the atomic PWM API.
1926 pwm_apply_args(panel->backlight.pwm);
1928 panel->backlight.max = 100; /* 100% */
1929 panel->backlight.min = get_backlight_min_vbt(connector);
1930 level = intel_panel_compute_brightness(connector, 100);
1931 ns = DIV_ROUND_UP(level * panel->backlight.pwm_period_ns, 100);
1933 retval = pwm_config(panel->backlight.pwm, ns,
1934 panel->backlight.pwm_period_ns);
1936 drm_err(&dev_priv->drm, "Failed to configure the pwm chip\n");
1937 pwm_put(panel->backlight.pwm);
1938 panel->backlight.pwm = NULL;
1942 level = DIV_ROUND_UP(pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1943 panel->backlight.pwm_period_ns);
1944 level = intel_panel_compute_brightness(connector, level);
1945 panel->backlight.level = clamp(level, panel->backlight.min,
1946 panel->backlight.max);
1947 panel->backlight.enabled = panel->backlight.level != 0;
1949 drm_info(&dev_priv->drm, "Using %s PWM for LCD backlight control\n",
1954 void intel_panel_update_backlight(struct intel_atomic_state *state,
1955 struct intel_encoder *encoder,
1956 const struct intel_crtc_state *crtc_state,
1957 const struct drm_connector_state *conn_state)
1959 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1960 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1961 struct intel_panel *panel = &connector->panel;
1963 if (!panel->backlight.present)
1966 mutex_lock(&dev_priv->backlight_lock);
1967 if (!panel->backlight.enabled)
1968 __intel_panel_enable_backlight(crtc_state, conn_state);
1970 mutex_unlock(&dev_priv->backlight_lock);
1973 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1975 struct drm_i915_private *dev_priv = to_i915(connector->dev);
1976 struct intel_connector *intel_connector = to_intel_connector(connector);
1977 struct intel_panel *panel = &intel_connector->panel;
1980 if (!dev_priv->vbt.backlight.present) {
1981 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1982 drm_dbg_kms(&dev_priv->drm,
1983 "no backlight present per VBT, but present per quirk\n");
1985 drm_dbg_kms(&dev_priv->drm,
1986 "no backlight present per VBT\n");
1991 /* ensure intel_panel has been initialized first */
1992 if (drm_WARN_ON(&dev_priv->drm, !panel->backlight.setup))
1995 /* set level and max in panel struct */
1996 mutex_lock(&dev_priv->backlight_lock);
1997 ret = panel->backlight.setup(intel_connector, pipe);
1998 mutex_unlock(&dev_priv->backlight_lock);
2001 drm_dbg_kms(&dev_priv->drm,
2002 "failed to setup backlight for connector %s\n",
2007 panel->backlight.present = true;
2009 drm_dbg_kms(&dev_priv->drm,
2010 "Connector %s backlight initialized, %s, brightness %u/%u\n",
2012 enableddisabled(panel->backlight.enabled),
2013 panel->backlight.level, panel->backlight.max);
2018 static void intel_panel_destroy_backlight(struct intel_panel *panel)
2020 /* dispose of the pwm */
2021 if (panel->backlight.pwm)
2022 pwm_put(panel->backlight.pwm);
2024 panel->backlight.present = false;
2027 /* Set up chip specific backlight functions */
2029 intel_panel_init_backlight_funcs(struct intel_panel *panel)
2031 struct intel_connector *connector =
2032 container_of(panel, struct intel_connector, panel);
2033 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
2035 if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
2036 intel_dp_aux_init_backlight_funcs(connector) == 0)
2039 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
2040 intel_dsi_dcs_init_backlight_funcs(connector) == 0)
2043 if (IS_GEN9_LP(dev_priv)) {
2044 panel->backlight.setup = bxt_setup_backlight;
2045 panel->backlight.enable = bxt_enable_backlight;
2046 panel->backlight.disable = bxt_disable_backlight;
2047 panel->backlight.set = bxt_set_backlight;
2048 panel->backlight.get = bxt_get_backlight;
2049 panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
2050 } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) {
2051 panel->backlight.setup = cnp_setup_backlight;
2052 panel->backlight.enable = cnp_enable_backlight;
2053 panel->backlight.disable = cnp_disable_backlight;
2054 panel->backlight.set = bxt_set_backlight;
2055 panel->backlight.get = bxt_get_backlight;
2056 panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
2057 } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) {
2058 panel->backlight.setup = lpt_setup_backlight;
2059 panel->backlight.enable = lpt_enable_backlight;
2060 panel->backlight.disable = lpt_disable_backlight;
2061 panel->backlight.set = lpt_set_backlight;
2062 panel->backlight.get = lpt_get_backlight;
2063 if (HAS_PCH_LPT(dev_priv))
2064 panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
2066 panel->backlight.hz_to_pwm = spt_hz_to_pwm;
2067 } else if (HAS_PCH_SPLIT(dev_priv)) {
2068 panel->backlight.setup = pch_setup_backlight;
2069 panel->backlight.enable = pch_enable_backlight;
2070 panel->backlight.disable = pch_disable_backlight;
2071 panel->backlight.set = pch_set_backlight;
2072 panel->backlight.get = pch_get_backlight;
2073 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
2074 } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
2075 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
2076 panel->backlight.setup = pwm_setup_backlight;
2077 panel->backlight.enable = pwm_enable_backlight;
2078 panel->backlight.disable = pwm_disable_backlight;
2079 panel->backlight.set = pwm_set_backlight;
2080 panel->backlight.get = pwm_get_backlight;
2082 panel->backlight.setup = vlv_setup_backlight;
2083 panel->backlight.enable = vlv_enable_backlight;
2084 panel->backlight.disable = vlv_disable_backlight;
2085 panel->backlight.set = vlv_set_backlight;
2086 panel->backlight.get = vlv_get_backlight;
2087 panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
2089 } else if (IS_GEN(dev_priv, 4)) {
2090 panel->backlight.setup = i965_setup_backlight;
2091 panel->backlight.enable = i965_enable_backlight;
2092 panel->backlight.disable = i965_disable_backlight;
2093 panel->backlight.set = i9xx_set_backlight;
2094 panel->backlight.get = i9xx_get_backlight;
2095 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
2097 panel->backlight.setup = i9xx_setup_backlight;
2098 panel->backlight.enable = i9xx_enable_backlight;
2099 panel->backlight.disable = i9xx_disable_backlight;
2100 panel->backlight.set = i9xx_set_backlight;
2101 panel->backlight.get = i9xx_get_backlight;
2102 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
2106 int intel_panel_init(struct intel_panel *panel,
2107 struct drm_display_mode *fixed_mode,
2108 struct drm_display_mode *downclock_mode)
2110 intel_panel_init_backlight_funcs(panel);
2112 panel->fixed_mode = fixed_mode;
2113 panel->downclock_mode = downclock_mode;
2118 void intel_panel_fini(struct intel_panel *panel)
2120 struct intel_connector *intel_connector =
2121 container_of(panel, struct intel_connector, panel);
2123 intel_panel_destroy_backlight(panel);
2125 if (panel->fixed_mode)
2126 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
2128 if (panel->downclock_mode)
2129 drm_mode_destroy(intel_connector->base.dev,
2130 panel->downclock_mode);