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_i915_private *dev_priv)
137 /* Restore the CTL value if it lost, e.g. GPU reset */
139 if (HAS_PCH_SPLIT(dev_priv->dev)) {
140 val = I915_READ(BLC_PWM_PCH_CTL2);
141 if (dev_priv->saveBLC_PWM_CTL2 == 0) {
142 dev_priv->saveBLC_PWM_CTL2 = val;
143 } else if (val == 0) {
144 I915_WRITE(BLC_PWM_PCH_CTL2,
145 dev_priv->saveBLC_PWM_CTL2);
146 val = dev_priv->saveBLC_PWM_CTL2;
149 val = I915_READ(BLC_PWM_CTL);
150 if (dev_priv->saveBLC_PWM_CTL == 0) {
151 dev_priv->saveBLC_PWM_CTL = val;
152 dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
153 } else if (val == 0) {
154 I915_WRITE(BLC_PWM_CTL,
155 dev_priv->saveBLC_PWM_CTL);
156 I915_WRITE(BLC_PWM_CTL2,
157 dev_priv->saveBLC_PWM_CTL2);
158 val = dev_priv->saveBLC_PWM_CTL;
165 u32 intel_panel_get_max_backlight(struct drm_device *dev)
167 struct drm_i915_private *dev_priv = dev->dev_private;
170 max = i915_read_blc_pwm_ctl(dev_priv);
172 /* XXX add code here to query mode clock or hardware clock
173 * and program max PWM appropriately.
175 pr_warn_once("fixme: max PWM is zero\n");
179 if (HAS_PCH_SPLIT(dev)) {
182 if (INTEL_INFO(dev)->gen < 4)
187 if (is_backlight_combination_mode(dev))
191 DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
195 static int i915_panel_invert_brightness;
196 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
197 "(-1 force normal, 0 machine defaults, 1 force inversion), please "
198 "report PCI device ID, subsystem vendor and subsystem device ID "
199 "to dri-devel@lists.freedesktop.org, if your machine needs it. "
200 "It will then be included in an upcoming module version.");
201 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
202 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
204 struct drm_i915_private *dev_priv = dev->dev_private;
206 if (i915_panel_invert_brightness < 0)
209 if (i915_panel_invert_brightness > 0 ||
210 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
211 return intel_panel_get_max_backlight(dev) - val;
216 static u32 intel_panel_get_backlight(struct drm_device *dev)
218 struct drm_i915_private *dev_priv = dev->dev_private;
221 if (HAS_PCH_SPLIT(dev)) {
222 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
224 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
225 if (INTEL_INFO(dev)->gen < 4)
228 if (is_backlight_combination_mode(dev)) {
231 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
236 val = intel_panel_compute_brightness(dev, val);
237 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
241 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
243 struct drm_i915_private *dev_priv = dev->dev_private;
244 u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
245 I915_WRITE(BLC_PWM_CPU_CTL, val | level);
248 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
250 struct drm_i915_private *dev_priv = dev->dev_private;
253 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
254 level = intel_panel_compute_brightness(dev, level);
256 if (HAS_PCH_SPLIT(dev))
257 return intel_pch_panel_set_backlight(dev, level);
259 if (is_backlight_combination_mode(dev)) {
260 u32 max = intel_panel_get_max_backlight(dev);
263 lbpc = level * 0xfe / max + 1;
265 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
268 tmp = I915_READ(BLC_PWM_CTL);
269 if (INTEL_INFO(dev)->gen < 4)
271 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
272 I915_WRITE(BLC_PWM_CTL, tmp | level);
275 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
277 struct drm_i915_private *dev_priv = dev->dev_private;
279 dev_priv->backlight_level = level;
280 if (dev_priv->backlight_enabled)
281 intel_panel_actually_set_backlight(dev, level);
284 void intel_panel_disable_backlight(struct drm_device *dev)
286 struct drm_i915_private *dev_priv = dev->dev_private;
288 dev_priv->backlight_enabled = false;
289 intel_panel_actually_set_backlight(dev, 0);
291 if (INTEL_INFO(dev)->gen >= 4) {
294 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
296 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
298 if (HAS_PCH_SPLIT(dev)) {
299 tmp = I915_READ(BLC_PWM_PCH_CTL1);
300 tmp &= ~BLM_PCH_PWM_ENABLE;
301 I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
306 void intel_panel_enable_backlight(struct drm_device *dev,
309 struct drm_i915_private *dev_priv = dev->dev_private;
311 if (dev_priv->backlight_level == 0)
312 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
314 if (INTEL_INFO(dev)->gen >= 4) {
317 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
320 tmp = I915_READ(reg);
322 /* Note that this can also get called through dpms changes. And
323 * we don't track the backlight dpms state, hence check whether
324 * we have to do anything first. */
325 if (tmp & BLM_PWM_ENABLE)
328 if (dev_priv->num_pipe == 3)
329 tmp &= ~BLM_PIPE_SELECT_IVB;
331 tmp &= ~BLM_PIPE_SELECT;
333 tmp |= BLM_PIPE(pipe);
334 tmp &= ~BLM_PWM_ENABLE;
336 I915_WRITE(reg, tmp);
338 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
340 if (HAS_PCH_SPLIT(dev)) {
341 tmp = I915_READ(BLC_PWM_PCH_CTL1);
342 tmp |= BLM_PCH_PWM_ENABLE;
343 tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
344 I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
349 /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
350 * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
353 dev_priv->backlight_enabled = true;
354 intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
357 static void intel_panel_init_backlight(struct drm_device *dev)
359 struct drm_i915_private *dev_priv = dev->dev_private;
361 dev_priv->backlight_level = intel_panel_get_backlight(dev);
362 dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
365 enum drm_connector_status
366 intel_panel_detect(struct drm_device *dev)
369 struct drm_i915_private *dev_priv = dev->dev_private;
372 if (i915_panel_ignore_lid)
373 return i915_panel_ignore_lid > 0 ?
374 connector_status_connected :
375 connector_status_disconnected;
377 /* opregion lid state on HP 2540p is wrong at boot up,
378 * appears to be either the BIOS or Linux ACPI fault */
380 /* Assume that the BIOS does not lie through the OpRegion... */
381 if (dev_priv->opregion.lid_state)
382 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
383 connector_status_connected :
384 connector_status_disconnected;
387 return connector_status_unknown;
390 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
391 static int intel_panel_update_status(struct backlight_device *bd)
393 struct drm_device *dev = bl_get_data(bd);
394 intel_panel_set_backlight(dev, bd->props.brightness);
398 static int intel_panel_get_brightness(struct backlight_device *bd)
400 struct drm_device *dev = bl_get_data(bd);
401 struct drm_i915_private *dev_priv = dev->dev_private;
402 return dev_priv->backlight_level;
405 static const struct backlight_ops intel_panel_bl_ops = {
406 .update_status = intel_panel_update_status,
407 .get_brightness = intel_panel_get_brightness,
410 int intel_panel_setup_backlight(struct drm_device *dev)
412 struct drm_i915_private *dev_priv = dev->dev_private;
413 struct backlight_properties props;
414 struct drm_connector *connector;
416 intel_panel_init_backlight(dev);
418 if (dev_priv->int_lvds_connector)
419 connector = dev_priv->int_lvds_connector;
420 else if (dev_priv->int_edp_connector)
421 connector = dev_priv->int_edp_connector;
425 memset(&props, 0, sizeof(props));
426 props.type = BACKLIGHT_RAW;
427 props.max_brightness = intel_panel_get_max_backlight(dev);
428 dev_priv->backlight =
429 backlight_device_register("intel_backlight",
430 &connector->kdev, dev,
431 &intel_panel_bl_ops, &props);
433 if (IS_ERR(dev_priv->backlight)) {
434 DRM_ERROR("Failed to register backlight: %ld\n",
435 PTR_ERR(dev_priv->backlight));
436 dev_priv->backlight = NULL;
439 dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
443 void intel_panel_destroy_backlight(struct drm_device *dev)
445 struct drm_i915_private *dev_priv = dev->dev_private;
446 if (dev_priv->backlight)
447 backlight_device_unregister(dev_priv->backlight);
450 int intel_panel_setup_backlight(struct drm_device *dev)
452 intel_panel_init_backlight(dev);
456 void intel_panel_destroy_backlight(struct drm_device *dev)