| /* |
| * Copyright © 2006-2010 Intel Corporation |
| * Copyright (c) 2006 Dave Airlie <airlied@linux.ie> |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| * DEALINGS IN THE SOFTWARE. |
| * |
| * Authors: |
| * Eric Anholt <eric@anholt.net> |
| * Dave Airlie <airlied@linux.ie> |
| * Jesse Barnes <jesse.barnes@intel.com> |
| * Chris Wilson <chris@chris-wilson.co.uk> |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/moduleparam.h> |
| #include "intel_drv.h" |
| |
| #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */ |
| |
| void |
| intel_fixed_panel_mode(struct drm_display_mode *fixed_mode, |
| struct drm_display_mode *adjusted_mode) |
| { |
| adjusted_mode->hdisplay = fixed_mode->hdisplay; |
| adjusted_mode->hsync_start = fixed_mode->hsync_start; |
| adjusted_mode->hsync_end = fixed_mode->hsync_end; |
| adjusted_mode->htotal = fixed_mode->htotal; |
| |
| adjusted_mode->vdisplay = fixed_mode->vdisplay; |
| adjusted_mode->vsync_start = fixed_mode->vsync_start; |
| adjusted_mode->vsync_end = fixed_mode->vsync_end; |
| adjusted_mode->vtotal = fixed_mode->vtotal; |
| |
| adjusted_mode->clock = fixed_mode->clock; |
| } |
| |
| /* adjusted_mode has been preset to be the panel's fixed mode */ |
| void |
| intel_pch_panel_fitting(struct drm_device *dev, |
| int fitting_mode, |
| const struct drm_display_mode *mode, |
| struct drm_display_mode *adjusted_mode) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| int x, y, width, height; |
| |
| x = y = width = height = 0; |
| |
| /* Native modes don't need fitting */ |
| if (adjusted_mode->hdisplay == mode->hdisplay && |
| adjusted_mode->vdisplay == mode->vdisplay) |
| goto done; |
| |
| switch (fitting_mode) { |
| case DRM_MODE_SCALE_CENTER: |
| width = mode->hdisplay; |
| height = mode->vdisplay; |
| x = (adjusted_mode->hdisplay - width + 1)/2; |
| y = (adjusted_mode->vdisplay - height + 1)/2; |
| break; |
| |
| case DRM_MODE_SCALE_ASPECT: |
| /* Scale but preserve the aspect ratio */ |
| { |
| u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay; |
| u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay; |
| if (scaled_width > scaled_height) { /* pillar */ |
| width = scaled_height / mode->vdisplay; |
| if (width & 1) |
| width++; |
| x = (adjusted_mode->hdisplay - width + 1) / 2; |
| y = 0; |
| height = adjusted_mode->vdisplay; |
| } else if (scaled_width < scaled_height) { /* letter */ |
| height = scaled_width / mode->hdisplay; |
| if (height & 1) |
| height++; |
| y = (adjusted_mode->vdisplay - height + 1) / 2; |
| x = 0; |
| width = adjusted_mode->hdisplay; |
| } else { |
| x = y = 0; |
| width = adjusted_mode->hdisplay; |
| height = adjusted_mode->vdisplay; |
| } |
| } |
| break; |
| |
| default: |
| case DRM_MODE_SCALE_FULLSCREEN: |
| x = y = 0; |
| width = adjusted_mode->hdisplay; |
| height = adjusted_mode->vdisplay; |
| break; |
| } |
| |
| done: |
| dev_priv->pch_pf_pos = (x << 16) | y; |
| dev_priv->pch_pf_size = (width << 16) | height; |
| } |
| |
| static int is_backlight_combination_mode(struct drm_device *dev) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| |
| if (INTEL_INFO(dev)->gen >= 4) |
| return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE; |
| |
| if (IS_GEN2(dev)) |
| return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE; |
| |
| return 0; |
| } |
| |
| /* XXX: query mode clock or hardware clock and program max PWM appropriately |
| * when it's 0. |
| */ |
| static u32 i915_read_blc_pwm_ctl(struct drm_device *dev) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| u32 val; |
| |
| WARN_ON(!spin_is_locked(&dev_priv->backlight.lock)); |
| |
| /* Restore the CTL value if it lost, e.g. GPU reset */ |
| |
| if (HAS_PCH_SPLIT(dev_priv->dev)) { |
| val = I915_READ(BLC_PWM_PCH_CTL2); |
| if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) { |
| dev_priv->regfile.saveBLC_PWM_CTL2 = val; |
| } else if (val == 0) { |
| val = dev_priv->regfile.saveBLC_PWM_CTL2; |
| I915_WRITE(BLC_PWM_PCH_CTL2, val); |
| } |
| } else { |
| val = I915_READ(BLC_PWM_CTL); |
| if (dev_priv->regfile.saveBLC_PWM_CTL == 0) { |
| dev_priv->regfile.saveBLC_PWM_CTL = val; |
| if (INTEL_INFO(dev)->gen >= 4) |
| dev_priv->regfile.saveBLC_PWM_CTL2 = |
| I915_READ(BLC_PWM_CTL2); |
| } else if (val == 0) { |
| val = dev_priv->regfile.saveBLC_PWM_CTL; |
| I915_WRITE(BLC_PWM_CTL, val); |
| if (INTEL_INFO(dev)->gen >= 4) |
| I915_WRITE(BLC_PWM_CTL2, |
| dev_priv->regfile.saveBLC_PWM_CTL2); |
| } |
| } |
| |
| return val; |
| } |
| |
| static u32 intel_panel_get_max_backlight(struct drm_device *dev) |
| { |
| u32 max; |
| |
| max = i915_read_blc_pwm_ctl(dev); |
| |
| if (HAS_PCH_SPLIT(dev)) { |
| max >>= 16; |
| } else { |
| if (INTEL_INFO(dev)->gen < 4) |
| max >>= 17; |
| else |
| max >>= 16; |
| |
| if (is_backlight_combination_mode(dev)) |
| max *= 0xff; |
| } |
| |
| DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max); |
| |
| return max; |
| } |
| |
| static int i915_panel_invert_brightness; |
| MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness " |
| "(-1 force normal, 0 machine defaults, 1 force inversion), please " |
| "report PCI device ID, subsystem vendor and subsystem device ID " |
| "to dri-devel@lists.freedesktop.org, if your machine needs it. " |
| "It will then be included in an upcoming module version."); |
| module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600); |
| static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| |
| if (i915_panel_invert_brightness < 0) |
| return val; |
| |
| if (i915_panel_invert_brightness > 0 || |
| dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) { |
| u32 max = intel_panel_get_max_backlight(dev); |
| if (max) |
| return max - val; |
| } |
| |
| return val; |
| } |
| |
| static u32 intel_panel_get_backlight(struct drm_device *dev) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| u32 val; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dev_priv->backlight.lock, flags); |
| |
| if (HAS_PCH_SPLIT(dev)) { |
| val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; |
| } else { |
| val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; |
| if (INTEL_INFO(dev)->gen < 4) |
| val >>= 1; |
| |
| if (is_backlight_combination_mode(dev)) { |
| u8 lbpc; |
| |
| pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc); |
| val *= lbpc; |
| } |
| } |
| |
| val = intel_panel_compute_brightness(dev, val); |
| |
| spin_unlock_irqrestore(&dev_priv->backlight.lock, flags); |
| |
| DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val); |
| return val; |
| } |
| |
| static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; |
| I915_WRITE(BLC_PWM_CPU_CTL, val | level); |
| } |
| |
| static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| u32 tmp; |
| |
| DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level); |
| level = intel_panel_compute_brightness(dev, level); |
| |
| if (HAS_PCH_SPLIT(dev)) |
| return intel_pch_panel_set_backlight(dev, level); |
| |
| if (is_backlight_combination_mode(dev)) { |
| u32 max = intel_panel_get_max_backlight(dev); |
| u8 lbpc; |
| |
| /* we're screwed, but keep behaviour backwards compatible */ |
| if (!max) |
| max = 1; |
| |
| lbpc = level * 0xfe / max + 1; |
| level /= lbpc; |
| pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc); |
| } |
| |
| tmp = I915_READ(BLC_PWM_CTL); |
| if (INTEL_INFO(dev)->gen < 4) |
| level <<= 1; |
| tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK; |
| I915_WRITE(BLC_PWM_CTL, tmp | level); |
| } |
| |
| /* set backlight brightness to level in range [0..max] */ |
| void intel_panel_set_backlight(struct drm_device *dev, u32 level, u32 max) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| u32 freq; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dev_priv->backlight.lock, flags); |
| |
| freq = intel_panel_get_max_backlight(dev); |
| if (!freq) { |
| /* we are screwed, bail out */ |
| goto out; |
| } |
| |
| /* scale to hardware */ |
| level = level * freq / max; |
| |
| dev_priv->backlight.level = level; |
| if (dev_priv->backlight.device) |
| dev_priv->backlight.device->props.brightness = level; |
| |
| if (dev_priv->backlight.enabled) |
| intel_panel_actually_set_backlight(dev, level); |
| out: |
| spin_unlock_irqrestore(&dev_priv->backlight.lock, flags); |
| } |
| |
| void intel_panel_disable_backlight(struct drm_device *dev) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dev_priv->backlight.lock, flags); |
| |
| dev_priv->backlight.enabled = false; |
| intel_panel_actually_set_backlight(dev, 0); |
| |
| if (INTEL_INFO(dev)->gen >= 4) { |
| uint32_t reg, tmp; |
| |
| reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; |
| |
| I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE); |
| |
| if (HAS_PCH_SPLIT(dev)) { |
| tmp = I915_READ(BLC_PWM_PCH_CTL1); |
| tmp &= ~BLM_PCH_PWM_ENABLE; |
| I915_WRITE(BLC_PWM_PCH_CTL1, tmp); |
| } |
| } |
| |
| spin_unlock_irqrestore(&dev_priv->backlight.lock, flags); |
| } |
| |
| void intel_panel_enable_backlight(struct drm_device *dev, |
| enum pipe pipe) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dev_priv->backlight.lock, flags); |
| |
| if (dev_priv->backlight.level == 0) { |
| dev_priv->backlight.level = intel_panel_get_max_backlight(dev); |
| if (dev_priv->backlight.device) |
| dev_priv->backlight.device->props.brightness = |
| dev_priv->backlight.level; |
| } |
| |
| if (INTEL_INFO(dev)->gen >= 4) { |
| uint32_t reg, tmp; |
| |
| reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; |
| |
| |
| tmp = I915_READ(reg); |
| |
| /* Note that this can also get called through dpms changes. And |
| * we don't track the backlight dpms state, hence check whether |
| * we have to do anything first. */ |
| if (tmp & BLM_PWM_ENABLE) |
| goto set_level; |
| |
| if (INTEL_INFO(dev)->num_pipes == 3) |
| tmp &= ~BLM_PIPE_SELECT_IVB; |
| else |
| tmp &= ~BLM_PIPE_SELECT; |
| |
| tmp |= BLM_PIPE(pipe); |
| tmp &= ~BLM_PWM_ENABLE; |
| |
| I915_WRITE(reg, tmp); |
| POSTING_READ(reg); |
| I915_WRITE(reg, tmp | BLM_PWM_ENABLE); |
| |
| if (HAS_PCH_SPLIT(dev)) { |
| tmp = I915_READ(BLC_PWM_PCH_CTL1); |
| tmp |= BLM_PCH_PWM_ENABLE; |
| tmp &= ~BLM_PCH_OVERRIDE_ENABLE; |
| I915_WRITE(BLC_PWM_PCH_CTL1, tmp); |
| } |
| } |
| |
| set_level: |
| /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1. |
| * BLC_PWM_CPU_CTL may be cleared to zero automatically when these |
| * registers are set. |
| */ |
| dev_priv->backlight.enabled = true; |
| intel_panel_actually_set_backlight(dev, dev_priv->backlight.level); |
| |
| spin_unlock_irqrestore(&dev_priv->backlight.lock, flags); |
| } |
| |
| static void intel_panel_init_backlight(struct drm_device *dev) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| |
| dev_priv->backlight.level = intel_panel_get_backlight(dev); |
| dev_priv->backlight.enabled = dev_priv->backlight.level != 0; |
| } |
| |
| enum drm_connector_status |
| intel_panel_detect(struct drm_device *dev) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| |
| /* Assume that the BIOS does not lie through the OpRegion... */ |
| if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) { |
| return ioread32(dev_priv->opregion.lid_state) & 0x1 ? |
| connector_status_connected : |
| connector_status_disconnected; |
| } |
| |
| switch (i915_panel_ignore_lid) { |
| case -2: |
| return connector_status_connected; |
| case -1: |
| return connector_status_disconnected; |
| default: |
| return connector_status_unknown; |
| } |
| } |
| |
| #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE |
| static int intel_panel_update_status(struct backlight_device *bd) |
| { |
| struct drm_device *dev = bl_get_data(bd); |
| intel_panel_set_backlight(dev, bd->props.brightness, |
| bd->props.max_brightness); |
| return 0; |
| } |
| |
| static int intel_panel_get_brightness(struct backlight_device *bd) |
| { |
| struct drm_device *dev = bl_get_data(bd); |
| return intel_panel_get_backlight(dev); |
| } |
| |
| static const struct backlight_ops intel_panel_bl_ops = { |
| .update_status = intel_panel_update_status, |
| .get_brightness = intel_panel_get_brightness, |
| }; |
| |
| int intel_panel_setup_backlight(struct drm_connector *connector) |
| { |
| struct drm_device *dev = connector->dev; |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| struct backlight_properties props; |
| unsigned long flags; |
| |
| intel_panel_init_backlight(dev); |
| |
| if (WARN_ON(dev_priv->backlight.device)) |
| return -ENODEV; |
| |
| memset(&props, 0, sizeof(props)); |
| props.type = BACKLIGHT_RAW; |
| props.brightness = dev_priv->backlight.level; |
| |
| spin_lock_irqsave(&dev_priv->backlight.lock, flags); |
| props.max_brightness = intel_panel_get_max_backlight(dev); |
| spin_unlock_irqrestore(&dev_priv->backlight.lock, flags); |
| |
| if (props.max_brightness == 0) { |
| DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n"); |
| return -ENODEV; |
| } |
| dev_priv->backlight.device = |
| backlight_device_register("intel_backlight", |
| &connector->kdev, dev, |
| &intel_panel_bl_ops, &props); |
| |
| if (IS_ERR(dev_priv->backlight.device)) { |
| DRM_ERROR("Failed to register backlight: %ld\n", |
| PTR_ERR(dev_priv->backlight.device)); |
| dev_priv->backlight.device = NULL; |
| return -ENODEV; |
| } |
| return 0; |
| } |
| |
| void intel_panel_destroy_backlight(struct drm_device *dev) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| if (dev_priv->backlight.device) { |
| backlight_device_unregister(dev_priv->backlight.device); |
| dev_priv->backlight.device = NULL; |
| } |
| } |
| #else |
| int intel_panel_setup_backlight(struct drm_connector *connector) |
| { |
| intel_panel_init_backlight(connector->dev); |
| return 0; |
| } |
| |
| void intel_panel_destroy_backlight(struct drm_device *dev) |
| { |
| return; |
| } |
| #endif |
| |
| int intel_panel_init(struct intel_panel *panel, |
| struct drm_display_mode *fixed_mode) |
| { |
| panel->fixed_mode = fixed_mode; |
| |
| return 0; |
| } |
| |
| void intel_panel_fini(struct intel_panel *panel) |
| { |
| struct intel_connector *intel_connector = |
| container_of(panel, struct intel_connector, panel); |
| |
| if (panel->fixed_mode) |
| drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode); |
| } |