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 #include "intel_drv.h"
33 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
36 intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
37 struct drm_display_mode *adjusted_mode)
39 adjusted_mode->hdisplay = fixed_mode->hdisplay;
40 adjusted_mode->hsync_start = fixed_mode->hsync_start;
41 adjusted_mode->hsync_end = fixed_mode->hsync_end;
42 adjusted_mode->htotal = fixed_mode->htotal;
44 adjusted_mode->vdisplay = fixed_mode->vdisplay;
45 adjusted_mode->vsync_start = fixed_mode->vsync_start;
46 adjusted_mode->vsync_end = fixed_mode->vsync_end;
47 adjusted_mode->vtotal = fixed_mode->vtotal;
49 adjusted_mode->clock = fixed_mode->clock;
51 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
54 /* adjusted_mode has been preset to be the panel's fixed mode */
56 intel_pch_panel_fitting(struct drm_device *dev,
58 struct drm_display_mode *mode,
59 struct drm_display_mode *adjusted_mode)
61 struct drm_i915_private *dev_priv = dev->dev_private;
62 int x, y, width, height;
64 x = y = width = height = 0;
66 /* Native modes don't need fitting */
67 if (adjusted_mode->hdisplay == mode->hdisplay &&
68 adjusted_mode->vdisplay == mode->vdisplay)
71 switch (fitting_mode) {
72 case DRM_MODE_SCALE_CENTER:
73 width = mode->hdisplay;
74 height = mode->vdisplay;
75 x = (adjusted_mode->hdisplay - width + 1)/2;
76 y = (adjusted_mode->vdisplay - height + 1)/2;
79 case DRM_MODE_SCALE_ASPECT:
80 /* Scale but preserve the aspect ratio */
82 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
83 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
84 if (scaled_width > scaled_height) { /* pillar */
85 width = scaled_height / mode->vdisplay;
88 x = (adjusted_mode->hdisplay - width + 1) / 2;
90 height = adjusted_mode->vdisplay;
91 } else if (scaled_width < scaled_height) { /* letter */
92 height = scaled_width / mode->hdisplay;
95 y = (adjusted_mode->vdisplay - height + 1) / 2;
97 width = adjusted_mode->hdisplay;
100 width = adjusted_mode->hdisplay;
101 height = adjusted_mode->vdisplay;
107 case DRM_MODE_SCALE_FULLSCREEN:
109 width = adjusted_mode->hdisplay;
110 height = adjusted_mode->vdisplay;
115 dev_priv->pch_pf_pos = (x << 16) | y;
116 dev_priv->pch_pf_size = (width << 16) | height;
119 static int is_backlight_combination_mode(struct drm_device *dev)
121 struct drm_i915_private *dev_priv = dev->dev_private;
123 if (INTEL_INFO(dev)->gen >= 4)
124 return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
127 return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
132 static u32 i915_read_blc_pwm_ctl(struct drm_i915_private *dev_priv)
136 /* Restore the CTL value if it lost, e.g. GPU reset */
138 if (HAS_PCH_SPLIT(dev_priv->dev)) {
139 val = I915_READ(BLC_PWM_PCH_CTL2);
140 if (dev_priv->saveBLC_PWM_CTL2 == 0) {
141 dev_priv->saveBLC_PWM_CTL2 = val;
142 } else if (val == 0) {
143 I915_WRITE(BLC_PWM_PCH_CTL2,
144 dev_priv->saveBLC_PWM_CTL);
145 val = dev_priv->saveBLC_PWM_CTL;
148 val = I915_READ(BLC_PWM_CTL);
149 if (dev_priv->saveBLC_PWM_CTL == 0) {
150 dev_priv->saveBLC_PWM_CTL = val;
151 dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
152 } else if (val == 0) {
153 I915_WRITE(BLC_PWM_CTL,
154 dev_priv->saveBLC_PWM_CTL);
155 I915_WRITE(BLC_PWM_CTL2,
156 dev_priv->saveBLC_PWM_CTL2);
157 val = dev_priv->saveBLC_PWM_CTL;
164 u32 intel_panel_get_max_backlight(struct drm_device *dev)
166 struct drm_i915_private *dev_priv = dev->dev_private;
169 max = i915_read_blc_pwm_ctl(dev_priv);
171 /* XXX add code here to query mode clock or hardware clock
172 * and program max PWM appropriately.
174 printk_once(KERN_WARNING "fixme: max PWM is zero.\n");
178 if (HAS_PCH_SPLIT(dev)) {
181 if (INTEL_INFO(dev)->gen < 4)
186 if (is_backlight_combination_mode(dev))
190 DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
194 u32 intel_panel_get_backlight(struct drm_device *dev)
196 struct drm_i915_private *dev_priv = dev->dev_private;
199 if (HAS_PCH_SPLIT(dev)) {
200 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
202 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
203 if (INTEL_INFO(dev)->gen < 4)
206 if (is_backlight_combination_mode(dev)) {
209 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
214 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
218 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
220 struct drm_i915_private *dev_priv = dev->dev_private;
221 u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
222 I915_WRITE(BLC_PWM_CPU_CTL, val | level);
225 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
227 struct drm_i915_private *dev_priv = dev->dev_private;
230 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
232 if (HAS_PCH_SPLIT(dev))
233 return intel_pch_panel_set_backlight(dev, level);
235 if (is_backlight_combination_mode(dev)) {
236 u32 max = intel_panel_get_max_backlight(dev);
239 lbpc = level * 0xfe / max + 1;
241 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
244 tmp = I915_READ(BLC_PWM_CTL);
245 if (INTEL_INFO(dev)->gen < 4)
247 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
248 I915_WRITE(BLC_PWM_CTL, tmp | level);
251 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
253 struct drm_i915_private *dev_priv = dev->dev_private;
255 dev_priv->backlight_level = level;
256 if (dev_priv->backlight_enabled)
257 intel_panel_actually_set_backlight(dev, level);
260 void intel_panel_disable_backlight(struct drm_device *dev)
262 struct drm_i915_private *dev_priv = dev->dev_private;
264 dev_priv->backlight_enabled = false;
265 intel_panel_actually_set_backlight(dev, 0);
268 void intel_panel_enable_backlight(struct drm_device *dev)
270 struct drm_i915_private *dev_priv = dev->dev_private;
272 if (dev_priv->backlight_level == 0)
273 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
275 dev_priv->backlight_enabled = true;
276 intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
279 static void intel_panel_init_backlight(struct drm_device *dev)
281 struct drm_i915_private *dev_priv = dev->dev_private;
283 dev_priv->backlight_level = intel_panel_get_backlight(dev);
284 dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
287 enum drm_connector_status
288 intel_panel_detect(struct drm_device *dev)
291 struct drm_i915_private *dev_priv = dev->dev_private;
294 if (i915_panel_ignore_lid)
295 return i915_panel_ignore_lid > 0 ?
296 connector_status_connected :
297 connector_status_disconnected;
299 /* opregion lid state on HP 2540p is wrong at boot up,
300 * appears to be either the BIOS or Linux ACPI fault */
302 /* Assume that the BIOS does not lie through the OpRegion... */
303 if (dev_priv->opregion.lid_state)
304 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
305 connector_status_connected :
306 connector_status_disconnected;
309 return connector_status_unknown;
312 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
313 static int intel_panel_update_status(struct backlight_device *bd)
315 struct drm_device *dev = bl_get_data(bd);
316 intel_panel_set_backlight(dev, bd->props.brightness);
320 static int intel_panel_get_brightness(struct backlight_device *bd)
322 struct drm_device *dev = bl_get_data(bd);
323 struct drm_i915_private *dev_priv = dev->dev_private;
324 return dev_priv->backlight_level;
327 static const struct backlight_ops intel_panel_bl_ops = {
328 .update_status = intel_panel_update_status,
329 .get_brightness = intel_panel_get_brightness,
332 int intel_panel_setup_backlight(struct drm_device *dev)
334 struct drm_i915_private *dev_priv = dev->dev_private;
335 struct backlight_properties props;
336 struct drm_connector *connector;
338 intel_panel_init_backlight(dev);
340 if (dev_priv->int_lvds_connector)
341 connector = dev_priv->int_lvds_connector;
342 else if (dev_priv->int_edp_connector)
343 connector = dev_priv->int_edp_connector;
347 props.type = BACKLIGHT_RAW;
348 props.max_brightness = intel_panel_get_max_backlight(dev);
349 dev_priv->backlight =
350 backlight_device_register("intel_backlight",
351 &connector->kdev, dev,
352 &intel_panel_bl_ops, &props);
354 if (IS_ERR(dev_priv->backlight)) {
355 DRM_ERROR("Failed to register backlight: %ld\n",
356 PTR_ERR(dev_priv->backlight));
357 dev_priv->backlight = NULL;
360 dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
364 void intel_panel_destroy_backlight(struct drm_device *dev)
366 struct drm_i915_private *dev_priv = dev->dev_private;
367 if (dev_priv->backlight)
368 backlight_device_unregister(dev_priv->backlight);
371 int intel_panel_setup_backlight(struct drm_device *dev)
373 intel_panel_init_backlight(dev);
377 void intel_panel_destroy_backlight(struct drm_device *dev)