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.
197 pr_warn_once("fixme: max PWM is zero\n");
201 DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
205 static int i915_panel_invert_brightness;
206 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
207 "(-1 force normal, 0 machine defaults, 1 force inversion), please "
208 "report PCI device ID, subsystem vendor and subsystem device ID "
209 "to dri-devel@lists.freedesktop.org, if your machine needs it. "
210 "It will then be included in an upcoming module version.");
211 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
212 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
214 struct drm_i915_private *dev_priv = dev->dev_private;
216 if (i915_panel_invert_brightness < 0)
219 if (i915_panel_invert_brightness > 0 ||
220 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
221 return intel_panel_get_max_backlight(dev) - val;
226 static u32 intel_panel_get_backlight(struct drm_device *dev)
228 struct drm_i915_private *dev_priv = dev->dev_private;
231 if (HAS_PCH_SPLIT(dev)) {
232 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
234 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
235 if (INTEL_INFO(dev)->gen < 4)
238 if (is_backlight_combination_mode(dev)) {
241 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
246 val = intel_panel_compute_brightness(dev, val);
247 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
251 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
253 struct drm_i915_private *dev_priv = dev->dev_private;
254 u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
255 I915_WRITE(BLC_PWM_CPU_CTL, val | level);
258 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
260 struct drm_i915_private *dev_priv = dev->dev_private;
263 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
264 level = intel_panel_compute_brightness(dev, level);
266 if (HAS_PCH_SPLIT(dev))
267 return intel_pch_panel_set_backlight(dev, level);
269 if (is_backlight_combination_mode(dev)) {
270 u32 max = intel_panel_get_max_backlight(dev);
273 lbpc = level * 0xfe / max + 1;
275 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
278 tmp = I915_READ(BLC_PWM_CTL);
279 if (INTEL_INFO(dev)->gen < 4)
281 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
282 I915_WRITE(BLC_PWM_CTL, tmp | level);
285 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
287 struct drm_i915_private *dev_priv = dev->dev_private;
289 dev_priv->backlight.level = level;
290 if (dev_priv->backlight.device)
291 dev_priv->backlight.device->props.brightness = 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);
326 if (dev_priv->backlight.device)
327 dev_priv->backlight.device->props.brightness =
328 dev_priv->backlight.level;
331 if (INTEL_INFO(dev)->gen >= 4) {
334 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
337 tmp = I915_READ(reg);
339 /* Note that this can also get called through dpms changes. And
340 * we don't track the backlight dpms state, hence check whether
341 * we have to do anything first. */
342 if (tmp & BLM_PWM_ENABLE)
345 if (INTEL_INFO(dev)->num_pipes == 3)
346 tmp &= ~BLM_PIPE_SELECT_IVB;
348 tmp &= ~BLM_PIPE_SELECT;
350 tmp |= BLM_PIPE(pipe);
351 tmp &= ~BLM_PWM_ENABLE;
353 I915_WRITE(reg, tmp);
355 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
357 if (HAS_PCH_SPLIT(dev) &&
358 !(dev_priv->quirks & QUIRK_NO_PCH_PWM_ENABLE)) {
359 tmp = I915_READ(BLC_PWM_PCH_CTL1);
360 tmp |= BLM_PCH_PWM_ENABLE;
361 tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
362 I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
367 /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
368 * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
371 dev_priv->backlight.enabled = true;
372 intel_panel_actually_set_backlight(dev, dev_priv->backlight.level);
375 static void intel_panel_init_backlight(struct drm_device *dev)
377 struct drm_i915_private *dev_priv = dev->dev_private;
379 dev_priv->backlight.level = intel_panel_get_backlight(dev);
380 dev_priv->backlight.enabled = dev_priv->backlight.level != 0;
383 enum drm_connector_status
384 intel_panel_detect(struct drm_device *dev)
386 struct drm_i915_private *dev_priv = dev->dev_private;
388 /* Assume that the BIOS does not lie through the OpRegion... */
389 if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
390 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
391 connector_status_connected :
392 connector_status_disconnected;
395 switch (i915_panel_ignore_lid) {
397 return connector_status_connected;
399 return connector_status_disconnected;
401 return connector_status_unknown;
405 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
406 static int intel_panel_update_status(struct backlight_device *bd)
408 struct drm_device *dev = bl_get_data(bd);
409 intel_panel_set_backlight(dev, bd->props.brightness);
413 static int intel_panel_get_brightness(struct backlight_device *bd)
415 struct drm_device *dev = bl_get_data(bd);
416 return intel_panel_get_backlight(dev);
419 static const struct backlight_ops intel_panel_bl_ops = {
420 .update_status = intel_panel_update_status,
421 .get_brightness = intel_panel_get_brightness,
424 int intel_panel_setup_backlight(struct drm_connector *connector)
426 struct drm_device *dev = connector->dev;
427 struct drm_i915_private *dev_priv = dev->dev_private;
428 struct backlight_properties props;
430 intel_panel_init_backlight(dev);
432 if (WARN_ON(dev_priv->backlight.device))
435 memset(&props, 0, sizeof(props));
436 props.type = BACKLIGHT_RAW;
437 props.brightness = dev_priv->backlight.level;
438 props.max_brightness = _intel_panel_get_max_backlight(dev);
439 if (props.max_brightness == 0) {
440 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
443 dev_priv->backlight.device =
444 backlight_device_register("intel_backlight",
445 &connector->kdev, dev,
446 &intel_panel_bl_ops, &props);
448 if (IS_ERR(dev_priv->backlight.device)) {
449 DRM_ERROR("Failed to register backlight: %ld\n",
450 PTR_ERR(dev_priv->backlight.device));
451 dev_priv->backlight.device = NULL;
457 void intel_panel_destroy_backlight(struct drm_device *dev)
459 struct drm_i915_private *dev_priv = dev->dev_private;
460 if (dev_priv->backlight.device) {
461 backlight_device_unregister(dev_priv->backlight.device);
462 dev_priv->backlight.device = NULL;
466 int intel_panel_setup_backlight(struct drm_connector *connector)
468 intel_panel_init_backlight(connector->dev);
472 void intel_panel_destroy_backlight(struct drm_device *dev)
478 int intel_panel_init(struct intel_panel *panel,
479 struct drm_display_mode *fixed_mode)
481 panel->fixed_mode = fixed_mode;
486 void intel_panel_fini(struct intel_panel *panel)
488 struct intel_connector *intel_connector =
489 container_of(panel, struct intel_connector, panel);
491 if (panel->fixed_mode)
492 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);