- 根目录:
- drivers
- gpu
- drm
- i915
- intel_panel.c
/*
* 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;
}
static u32 i915_read_blc_pwm_ctl(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 val;
/* 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;
}
return max;
}
u32 intel_panel_get_max_backlight(struct drm_device *dev)
{
u32 max;
max = _intel_panel_get_max_backlight(dev);
if (max == 0) {
/* XXX add code here to query mode clock or hardware clock
* and program max PWM appropriately.
*/
pr_warn_once("fixme: max PWM is zero\n");
return 1;
}
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)
return intel_panel_get_max_backlight(dev) - val;
return val;
}
static u32 intel_panel_get_backlight(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 val;
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);
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;
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);
}
void intel_panel_set_backlight(struct drm_device *dev, u32 level)
{
struct drm_i915_private *dev_priv = dev->dev_private;
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);
}
void intel_panel_disable_backlight(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
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);
}
}
}
void intel_panel_enable_backlight(struct drm_device *dev,
enum pipe pipe)
{
struct drm_i915_private *dev_priv = dev->dev_private;
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);
}
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);
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;
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;
props.max_brightness = _intel_panel_get_max_backlight(dev);
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);
}