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/moduleparam.h>
34 #include "intel_drv.h"
36 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
39 intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
40 struct drm_display_mode *adjusted_mode)
42 adjusted_mode->hdisplay = fixed_mode->hdisplay;
43 adjusted_mode->hsync_start = fixed_mode->hsync_start;
44 adjusted_mode->hsync_end = fixed_mode->hsync_end;
45 adjusted_mode->htotal = fixed_mode->htotal;
47 adjusted_mode->vdisplay = fixed_mode->vdisplay;
48 adjusted_mode->vsync_start = fixed_mode->vsync_start;
49 adjusted_mode->vsync_end = fixed_mode->vsync_end;
50 adjusted_mode->vtotal = fixed_mode->vtotal;
52 adjusted_mode->clock = fixed_mode->clock;
55 /* adjusted_mode has been preset to be the panel's fixed mode */
57 intel_pch_panel_fitting(struct drm_device *dev,
59 const struct drm_display_mode *mode,
60 struct drm_display_mode *adjusted_mode)
62 struct drm_i915_private *dev_priv = dev->dev_private;
63 int x, y, width, height;
65 x = y = width = height = 0;
67 /* Native modes don't need fitting */
68 if (adjusted_mode->hdisplay == mode->hdisplay &&
69 adjusted_mode->vdisplay == mode->vdisplay)
72 switch (fitting_mode) {
73 case DRM_MODE_SCALE_CENTER:
74 width = mode->hdisplay;
75 height = mode->vdisplay;
76 x = (adjusted_mode->hdisplay - width + 1)/2;
77 y = (adjusted_mode->vdisplay - height + 1)/2;
80 case DRM_MODE_SCALE_ASPECT:
81 /* Scale but preserve the aspect ratio */
83 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
84 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
85 if (scaled_width > scaled_height) { /* pillar */
86 width = scaled_height / mode->vdisplay;
89 x = (adjusted_mode->hdisplay - width + 1) / 2;
91 height = adjusted_mode->vdisplay;
92 } else if (scaled_width < scaled_height) { /* letter */
93 height = scaled_width / mode->hdisplay;
96 y = (adjusted_mode->vdisplay - height + 1) / 2;
98 width = adjusted_mode->hdisplay;
101 width = adjusted_mode->hdisplay;
102 height = adjusted_mode->vdisplay;
108 case DRM_MODE_SCALE_FULLSCREEN:
110 width = adjusted_mode->hdisplay;
111 height = adjusted_mode->vdisplay;
116 dev_priv->pch_pf_pos = (x << 16) | y;
117 dev_priv->pch_pf_size = (width << 16) | height;
120 static int is_backlight_combination_mode(struct drm_device *dev)
122 struct drm_i915_private *dev_priv = dev->dev_private;
124 if (INTEL_INFO(dev)->gen >= 4)
125 return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
128 return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
133 static u32 i915_read_blc_pwm_ctl(struct drm_device *dev)
135 struct drm_i915_private *dev_priv = dev->dev_private;
138 /* Restore the CTL value if it lost, e.g. GPU reset */
140 if (HAS_PCH_SPLIT(dev_priv->dev)) {
141 val = I915_READ(BLC_PWM_PCH_CTL2);
142 if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) {
143 dev_priv->regfile.saveBLC_PWM_CTL2 = val;
144 } else if (val == 0) {
145 val = dev_priv->regfile.saveBLC_PWM_CTL2;
146 I915_WRITE(BLC_PWM_PCH_CTL2, val);
149 val = I915_READ(BLC_PWM_CTL);
150 if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
151 dev_priv->regfile.saveBLC_PWM_CTL = val;
152 if (INTEL_INFO(dev)->gen >= 4)
153 dev_priv->regfile.saveBLC_PWM_CTL2 =
154 I915_READ(BLC_PWM_CTL2);
155 } else if (val == 0) {
156 val = dev_priv->regfile.saveBLC_PWM_CTL;
157 I915_WRITE(BLC_PWM_CTL, val);
158 if (INTEL_INFO(dev)->gen >= 4)
159 I915_WRITE(BLC_PWM_CTL2,
160 dev_priv->regfile.saveBLC_PWM_CTL2);
167 static u32 _intel_panel_get_max_backlight(struct drm_device *dev)
171 max = i915_read_blc_pwm_ctl(dev);
173 if (HAS_PCH_SPLIT(dev)) {
176 if (INTEL_INFO(dev)->gen < 4)
181 if (is_backlight_combination_mode(dev))
188 u32 intel_panel_get_max_backlight(struct drm_device *dev)
192 max = _intel_panel_get_max_backlight(dev);
194 /* XXX add code here to query mode clock or hardware clock
195 * and program max PWM appropriately.
198 pr_warn_once("fixme: max PWM is zero\n");
203 DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
207 static int i915_panel_invert_brightness;
208 TUNABLE_INT("drm.i915.panel_invert_brightness", &i915_panel_invert_brightness);
209 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
210 "(-1 force normal, 0 machine defaults, 1 force inversion), please "
211 "report PCI device ID, subsystem vendor and subsystem device ID "
212 "to dri-devel@lists.freedesktop.org, if your machine needs it. "
213 "It will then be included in an upcoming module version.");
214 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
215 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
217 struct drm_i915_private *dev_priv = dev->dev_private;
219 if (i915_panel_invert_brightness < 0)
222 if (i915_panel_invert_brightness > 0 ||
223 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
224 return intel_panel_get_max_backlight(dev) - val;
229 static u32 intel_panel_get_backlight(struct drm_device *dev)
231 struct drm_i915_private *dev_priv = dev->dev_private;
234 if (HAS_PCH_SPLIT(dev)) {
235 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
237 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
238 if (INTEL_INFO(dev)->gen < 4)
241 if (is_backlight_combination_mode(dev)) {
244 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
249 val = intel_panel_compute_brightness(dev, val);
250 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
254 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
256 struct drm_i915_private *dev_priv = dev->dev_private;
257 u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
258 I915_WRITE(BLC_PWM_CPU_CTL, val | level);
261 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
263 struct drm_i915_private *dev_priv = dev->dev_private;
266 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
267 level = intel_panel_compute_brightness(dev, level);
269 if (HAS_PCH_SPLIT(dev))
270 return intel_pch_panel_set_backlight(dev, level);
272 if (is_backlight_combination_mode(dev)) {
273 u32 max = intel_panel_get_max_backlight(dev);
276 lbpc = level * 0xfe / max + 1;
278 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
281 tmp = I915_READ(BLC_PWM_CTL);
282 if (INTEL_INFO(dev)->gen < 4)
284 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
285 I915_WRITE(BLC_PWM_CTL, tmp | level);
288 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
290 struct drm_i915_private *dev_priv = dev->dev_private;
292 dev_priv->backlight_level = level;
293 if (dev_priv->backlight_enabled)
294 intel_panel_actually_set_backlight(dev, level);
297 void intel_panel_disable_backlight(struct drm_device *dev)
299 struct drm_i915_private *dev_priv = dev->dev_private;
301 dev_priv->backlight_enabled = false;
302 intel_panel_actually_set_backlight(dev, 0);
304 if (INTEL_INFO(dev)->gen >= 4) {
307 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
309 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
311 if (HAS_PCH_SPLIT(dev)) {
312 tmp = I915_READ(BLC_PWM_PCH_CTL1);
313 tmp &= ~BLM_PCH_PWM_ENABLE;
314 I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
319 void intel_panel_enable_backlight(struct drm_device *dev,
322 struct drm_i915_private *dev_priv = dev->dev_private;
324 if (dev_priv->backlight_level == 0)
325 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
327 if (INTEL_INFO(dev)->gen >= 4) {
330 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
333 tmp = I915_READ(reg);
335 /* Note that this can also get called through dpms changes. And
336 * we don't track the backlight dpms state, hence check whether
337 * we have to do anything first. */
338 if (tmp & BLM_PWM_ENABLE)
341 if (dev_priv->num_pipe == 3)
342 tmp &= ~BLM_PIPE_SELECT_IVB;
344 tmp &= ~BLM_PIPE_SELECT;
346 tmp |= BLM_PIPE(pipe);
347 tmp &= ~BLM_PWM_ENABLE;
349 I915_WRITE(reg, tmp);
351 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
353 if (HAS_PCH_SPLIT(dev)) {
354 tmp = I915_READ(BLC_PWM_PCH_CTL1);
355 tmp |= BLM_PCH_PWM_ENABLE;
356 tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
357 I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
362 /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
363 * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
366 dev_priv->backlight_enabled = true;
367 intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
370 static void intel_panel_init_backlight(struct drm_device *dev)
372 struct drm_i915_private *dev_priv = dev->dev_private;
374 dev_priv->backlight_level = intel_panel_get_backlight(dev);
375 dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
378 enum drm_connector_status
379 intel_panel_detect(struct drm_device *dev)
381 struct drm_i915_private *dev_priv = dev->dev_private;
383 /* Assume that the BIOS does not lie through the OpRegion... */
384 if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
385 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
386 connector_status_connected :
387 connector_status_disconnected;
390 switch (i915_panel_ignore_lid) {
392 return connector_status_connected;
394 return connector_status_disconnected;
396 return connector_status_unknown;
400 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
401 static int intel_panel_update_status(struct backlight_device *bd)
403 struct drm_device *dev = bl_get_data(bd);
404 intel_panel_set_backlight(dev, bd->props.brightness);
408 static int intel_panel_get_brightness(struct backlight_device *bd)
410 struct drm_device *dev = bl_get_data(bd);
411 struct drm_i915_private *dev_priv = dev->dev_private;
412 return dev_priv->backlight_level;
415 static const struct backlight_ops intel_panel_bl_ops = {
416 .update_status = intel_panel_update_status,
417 .get_brightness = intel_panel_get_brightness,
420 int intel_panel_setup_backlight(struct drm_connector *connector)
422 struct drm_device *dev = connector->dev;
423 struct drm_i915_private *dev_priv = dev->dev_private;
424 struct backlight_properties props;
426 intel_panel_init_backlight(dev);
428 if (WARN_ON(dev_priv->backlight))
431 memset(&props, 0, sizeof(props));
432 props.type = BACKLIGHT_RAW;
433 props.max_brightness = _intel_panel_get_max_backlight(dev);
434 if (props.max_brightness == 0) {
435 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
438 dev_priv->backlight =
439 backlight_device_register("intel_backlight",
440 &connector->kdev, dev,
441 &intel_panel_bl_ops, &props);
443 if (IS_ERR(dev_priv->backlight)) {
444 DRM_ERROR("Failed to register backlight: %ld\n",
445 PTR_ERR(dev_priv->backlight));
446 dev_priv->backlight = NULL;
449 dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
453 void intel_panel_destroy_backlight(struct drm_device *dev)
455 struct drm_i915_private *dev_priv = dev->dev_private;
456 if (dev_priv->backlight) {
457 backlight_device_unregister(dev_priv->backlight);
458 dev_priv->backlight = NULL;
464 * Read max backlight level
467 sysctl_backlight_max(SYSCTL_HANDLER_ARGS)
471 val = intel_panel_get_max_backlight((struct drm_device *)arg1);
472 err = sysctl_handle_int(oidp, &val, 0, req);
477 * Read/write backlight level
480 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)
482 struct drm_i915_private *dev_priv;
485 dev_priv = ((struct drm_device *)arg1)->dev_private;
486 val = dev_priv->backlight_level;
488 err = sysctl_handle_int(oidp, &val, 0, req);
489 if (err != 0 || req->newptr == NULL) {
493 if (val != dev_priv->backlight_level && val >=0 &&
494 val <= intel_panel_get_max_backlight((struct drm_device *)arg1)) {
495 intel_panel_set_backlight(arg1, val);
501 int intel_panel_setup_backlight(struct drm_connector *connector)
503 intel_panel_init_backlight(connector->dev);
505 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
506 OID_AUTO, "backlight_max",
507 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY,
508 connector->dev, sizeof(int),
509 sysctl_backlight_max,
510 "I", "Max backlight level");
511 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
512 OID_AUTO, "backlight_level",
513 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
514 connector->dev, sizeof(int),
515 sysctl_backlight_handler,
516 "I", "Backlight level");
520 void intel_panel_destroy_backlight(struct drm_device *dev)
527 int intel_panel_init(struct intel_panel *panel,
528 struct drm_display_mode *fixed_mode)
530 panel->fixed_mode = fixed_mode;
535 void intel_panel_fini(struct intel_panel *panel)
537 struct intel_connector *intel_connector =
538 container_of(panel, struct intel_connector, panel);
540 if (panel->fixed_mode)
541 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);