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WSL2-Linux-Kernel/drivers/gpu/drm/i915/intel_panel.c

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40 KiB
C
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/*
* 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"
void
intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
struct drm_display_mode *adjusted_mode)
{
drm_mode_copy(adjusted_mode, fixed_mode);
drm_mode_set_crtcinfo(adjusted_mode, 0);
}
/**
* intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
* @dev: drm device
* @fixed_mode : panel native mode
* @connector: LVDS/eDP connector
*
* Return downclock_avail
* Find the reduced downclock for LVDS/eDP in EDID.
*/
struct drm_display_mode *
intel_find_panel_downclock(struct drm_device *dev,
struct drm_display_mode *fixed_mode,
struct drm_connector *connector)
{
struct drm_display_mode *scan, *tmp_mode;
int temp_downclock;
temp_downclock = fixed_mode->clock;
tmp_mode = NULL;
list_for_each_entry(scan, &connector->probed_modes, head) {
/*
* If one mode has the same resolution with the fixed_panel
* mode while they have the different refresh rate, it means
* that the reduced downclock is found. In such
* case we can set the different FPx0/1 to dynamically select
* between low and high frequency.
*/
if (scan->hdisplay == fixed_mode->hdisplay &&
scan->hsync_start == fixed_mode->hsync_start &&
scan->hsync_end == fixed_mode->hsync_end &&
scan->htotal == fixed_mode->htotal &&
scan->vdisplay == fixed_mode->vdisplay &&
scan->vsync_start == fixed_mode->vsync_start &&
scan->vsync_end == fixed_mode->vsync_end &&
scan->vtotal == fixed_mode->vtotal) {
if (scan->clock < temp_downclock) {
/*
* The downclock is already found. But we
* expect to find the lower downclock.
*/
temp_downclock = scan->clock;
tmp_mode = scan;
}
}
}
if (temp_downclock < fixed_mode->clock)
return drm_mode_duplicate(dev, tmp_mode);
else
return NULL;
}
/* adjusted_mode has been preset to be the panel's fixed mode */
void
intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
struct intel_crtc_config *pipe_config,
int fitting_mode)
{
struct drm_display_mode *adjusted_mode;
int x, y, width, height;
adjusted_mode = &pipe_config->adjusted_mode;
x = y = width = height = 0;
/* Native modes don't need fitting */
if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
adjusted_mode->vdisplay == pipe_config->pipe_src_h)
goto done;
switch (fitting_mode) {
case DRM_MODE_SCALE_CENTER:
width = pipe_config->pipe_src_w;
height = pipe_config->pipe_src_h;
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
* pipe_config->pipe_src_h;
u32 scaled_height = pipe_config->pipe_src_w
* adjusted_mode->vdisplay;
if (scaled_width > scaled_height) { /* pillar */
width = scaled_height / pipe_config->pipe_src_h;
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 / pipe_config->pipe_src_w;
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;
case DRM_MODE_SCALE_FULLSCREEN:
x = y = 0;
width = adjusted_mode->hdisplay;
height = adjusted_mode->vdisplay;
break;
default:
WARN(1, "bad panel fit mode: %d\n", fitting_mode);
return;
}
done:
pipe_config->pch_pfit.pos = (x << 16) | y;
pipe_config->pch_pfit.size = (width << 16) | height;
pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
}
static void
centre_horizontally(struct drm_display_mode *mode,
int width)
{
u32 border, sync_pos, blank_width, sync_width;
/* keep the hsync and hblank widths constant */
sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
sync_pos = (blank_width - sync_width + 1) / 2;
border = (mode->hdisplay - width + 1) / 2;
border += border & 1; /* make the border even */
mode->crtc_hdisplay = width;
mode->crtc_hblank_start = width + border;
mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
}
static void
centre_vertically(struct drm_display_mode *mode,
int height)
{
u32 border, sync_pos, blank_width, sync_width;
/* keep the vsync and vblank widths constant */
sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
sync_pos = (blank_width - sync_width + 1) / 2;
border = (mode->vdisplay - height + 1) / 2;
mode->crtc_vdisplay = height;
mode->crtc_vblank_start = height + border;
mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
}
static inline u32 panel_fitter_scaling(u32 source, u32 target)
{
/*
* Floating point operation is not supported. So the FACTOR
* is defined, which can avoid the floating point computation
* when calculating the panel ratio.
*/
#define ACCURACY 12
#define FACTOR (1 << ACCURACY)
u32 ratio = source * FACTOR / target;
return (FACTOR * ratio + FACTOR/2) / FACTOR;
}
static void i965_scale_aspect(struct intel_crtc_config *pipe_config,
u32 *pfit_control)
{
struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
u32 scaled_width = adjusted_mode->hdisplay *
pipe_config->pipe_src_h;
u32 scaled_height = pipe_config->pipe_src_w *
adjusted_mode->vdisplay;
/* 965+ is easy, it does everything in hw */
if (scaled_width > scaled_height)
*pfit_control |= PFIT_ENABLE |
PFIT_SCALING_PILLAR;
else if (scaled_width < scaled_height)
*pfit_control |= PFIT_ENABLE |
PFIT_SCALING_LETTER;
else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
*pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
}
static void i9xx_scale_aspect(struct intel_crtc_config *pipe_config,
u32 *pfit_control, u32 *pfit_pgm_ratios,
u32 *border)
{
struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
u32 scaled_width = adjusted_mode->hdisplay *
pipe_config->pipe_src_h;
u32 scaled_height = pipe_config->pipe_src_w *
adjusted_mode->vdisplay;
u32 bits;
/*
* For earlier chips we have to calculate the scaling
* ratio by hand and program it into the
* PFIT_PGM_RATIO register
*/
if (scaled_width > scaled_height) { /* pillar */
centre_horizontally(adjusted_mode,
scaled_height /
pipe_config->pipe_src_h);
*border = LVDS_BORDER_ENABLE;
if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
bits = panel_fitter_scaling(pipe_config->pipe_src_h,
adjusted_mode->vdisplay);
*pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
bits << PFIT_VERT_SCALE_SHIFT);
*pfit_control |= (PFIT_ENABLE |
VERT_INTERP_BILINEAR |
HORIZ_INTERP_BILINEAR);
}
} else if (scaled_width < scaled_height) { /* letter */
centre_vertically(adjusted_mode,
scaled_width /
pipe_config->pipe_src_w);
*border = LVDS_BORDER_ENABLE;
if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
bits = panel_fitter_scaling(pipe_config->pipe_src_w,
adjusted_mode->hdisplay);
*pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
bits << PFIT_VERT_SCALE_SHIFT);
*pfit_control |= (PFIT_ENABLE |
VERT_INTERP_BILINEAR |
HORIZ_INTERP_BILINEAR);
}
} else {
/* Aspects match, Let hw scale both directions */
*pfit_control |= (PFIT_ENABLE |
VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
VERT_INTERP_BILINEAR |
HORIZ_INTERP_BILINEAR);
}
}
void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
struct intel_crtc_config *pipe_config,
int fitting_mode)
{
struct drm_device *dev = intel_crtc->base.dev;
u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
struct drm_display_mode *adjusted_mode;
adjusted_mode = &pipe_config->adjusted_mode;
/* Native modes don't need fitting */
if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
adjusted_mode->vdisplay == pipe_config->pipe_src_h)
goto out;
switch (fitting_mode) {
case DRM_MODE_SCALE_CENTER:
/*
* For centered modes, we have to calculate border widths &
* heights and modify the values programmed into the CRTC.
*/
centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
border = LVDS_BORDER_ENABLE;
break;
case DRM_MODE_SCALE_ASPECT:
/* Scale but preserve the aspect ratio */
if (INTEL_INFO(dev)->gen >= 4)
i965_scale_aspect(pipe_config, &pfit_control);
else
i9xx_scale_aspect(pipe_config, &pfit_control,
&pfit_pgm_ratios, &border);
break;
case DRM_MODE_SCALE_FULLSCREEN:
/*
* Full scaling, even if it changes the aspect ratio.
* Fortunately this is all done for us in hw.
*/
if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
pfit_control |= PFIT_ENABLE;
if (INTEL_INFO(dev)->gen >= 4)
pfit_control |= PFIT_SCALING_AUTO;
else
pfit_control |= (VERT_AUTO_SCALE |
VERT_INTERP_BILINEAR |
HORIZ_AUTO_SCALE |
HORIZ_INTERP_BILINEAR);
}
break;
default:
WARN(1, "bad panel fit mode: %d\n", fitting_mode);
return;
}
/* 965+ wants fuzzy fitting */
/* FIXME: handle multiple panels by failing gracefully */
if (INTEL_INFO(dev)->gen >= 4)
pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
PFIT_FILTER_FUZZY);
out:
if ((pfit_control & PFIT_ENABLE) == 0) {
pfit_control = 0;
pfit_pgm_ratios = 0;
}
/* Make sure pre-965 set dither correctly for 18bpp panels. */
if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
pfit_control |= PANEL_8TO6_DITHER_ENABLE;
pipe_config->gmch_pfit.control = pfit_control;
pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
pipe_config->gmch_pfit.lvds_border_bits = border;
}
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;
}
}
/**
* scale - scale values from one range to another
*
* @source_val: value in range [@source_min..@source_max]
*
* Return @source_val in range [@source_min..@source_max] scaled to range
* [@target_min..@target_max].
*/
static uint32_t scale(uint32_t source_val,
uint32_t source_min, uint32_t source_max,
uint32_t target_min, uint32_t target_max)
{
uint64_t target_val;
WARN_ON(source_min > source_max);
WARN_ON(target_min > target_max);
/* defensive */
source_val = clamp(source_val, source_min, source_max);
/* avoid overflows */
target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
(target_max - target_min), source_max - source_min);
target_val += target_min;
return target_val;
}
/* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
static inline u32 scale_user_to_hw(struct intel_connector *connector,
u32 user_level, u32 user_max)
{
struct intel_panel *panel = &connector->panel;
return scale(user_level, 0, user_max,
panel->backlight.min, panel->backlight.max);
}
/* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
* to [hw_min..hw_max]. */
static inline u32 clamp_user_to_hw(struct intel_connector *connector,
u32 user_level, u32 user_max)
{
struct intel_panel *panel = &connector->panel;
u32 hw_level;
hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
return hw_level;
}
/* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
static inline u32 scale_hw_to_user(struct intel_connector *connector,
u32 hw_level, u32 user_max)
{
struct intel_panel *panel = &connector->panel;
return scale(hw_level, panel->backlight.min, panel->backlight.max,
0, user_max);
}
static u32 intel_panel_compute_brightness(struct intel_connector *connector,
u32 val)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
WARN_ON(panel->backlight.max == 0);
if (i915.invert_brightness < 0)
return val;
if (i915.invert_brightness > 0 ||
dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
return panel->backlight.max - val;
}
return val;
}
static u32 bdw_get_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
}
static u32 pch_get_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
}
static u32 i9xx_get_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
u32 val;
val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
if (INTEL_INFO(dev)->gen < 4)
val >>= 1;
if (panel->backlight.combination_mode) {
u8 lbpc;
pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
val *= lbpc;
}
return val;
}
static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
{
struct drm_i915_private *dev_priv = dev->dev_private;
return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
}
static u32 vlv_get_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
enum pipe pipe = intel_get_pipe_from_connector(connector);
return _vlv_get_backlight(dev, pipe);
}
static u32 intel_panel_get_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 val;
mutex_lock(&dev_priv->backlight_lock);
val = dev_priv->display.get_backlight(connector);
val = intel_panel_compute_brightness(connector, val);
mutex_unlock(&dev_priv->backlight_lock);
DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
return val;
}
static void bdw_set_backlight(struct intel_connector *connector, u32 level)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
}
static void pch_set_backlight(struct intel_connector *connector, u32 level)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 tmp;
tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
}
static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
u32 tmp, mask;
WARN_ON(panel->backlight.max == 0);
if (panel->backlight.combination_mode) {
u8 lbpc;
lbpc = level * 0xfe / panel->backlight.max + 1;
level /= lbpc;
pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
}
if (IS_GEN4(dev)) {
mask = BACKLIGHT_DUTY_CYCLE_MASK;
} else {
level <<= 1;
mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
}
tmp = I915_READ(BLC_PWM_CTL) & ~mask;
I915_WRITE(BLC_PWM_CTL, tmp | level);
}
static void vlv_set_backlight(struct intel_connector *connector, u32 level)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 tmp;
tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
}
static void
intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
level = intel_panel_compute_brightness(connector, level);
dev_priv->display.set_backlight(connector, level);
}
/* set backlight brightness to level in range [0..max], scaling wrt hw min */
static void intel_panel_set_backlight(struct intel_connector *connector,
u32 user_level, u32 user_max)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 hw_level;
if (!panel->backlight.present || pipe == INVALID_PIPE)
return;
mutex_lock(&dev_priv->backlight_lock);
WARN_ON(panel->backlight.max == 0);
hw_level = scale_user_to_hw(connector, user_level, user_max);
panel->backlight.level = hw_level;
if (panel->backlight.enabled)
intel_panel_actually_set_backlight(connector, hw_level);
mutex_unlock(&dev_priv->backlight_lock);
}
/* set backlight brightness to level in range [0..max], assuming hw min is
* respected.
*/
void intel_panel_set_backlight_acpi(struct intel_connector *connector,
u32 user_level, u32 user_max)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 hw_level;
if (!panel->backlight.present || pipe == INVALID_PIPE)
return;
mutex_lock(&dev_priv->backlight_lock);
WARN_ON(panel->backlight.max == 0);
hw_level = clamp_user_to_hw(connector, user_level, user_max);
panel->backlight.level = hw_level;
if (panel->backlight.device)
panel->backlight.device->props.brightness =
scale_hw_to_user(connector,
panel->backlight.level,
panel->backlight.device->props.max_brightness);
if (panel->backlight.enabled)
intel_panel_actually_set_backlight(connector, hw_level);
mutex_unlock(&dev_priv->backlight_lock);
}
static void pch_disable_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 tmp;
intel_panel_actually_set_backlight(connector, 0);
tmp = I915_READ(BLC_PWM_CPU_CTL2);
I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
tmp = I915_READ(BLC_PWM_PCH_CTL1);
I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
}
static void i9xx_disable_backlight(struct intel_connector *connector)
{
intel_panel_actually_set_backlight(connector, 0);
}
static void i965_disable_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 tmp;
intel_panel_actually_set_backlight(connector, 0);
tmp = I915_READ(BLC_PWM_CTL2);
I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
}
static void vlv_disable_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 tmp;
intel_panel_actually_set_backlight(connector, 0);
tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
}
void intel_panel_disable_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
if (!panel->backlight.present || pipe == INVALID_PIPE)
return;
/*
* Do not disable backlight on the vgaswitcheroo path. When switching
* away from i915, the other client may depend on i915 to handle the
* backlight. This will leave the backlight on unnecessarily when
* another client is not activated.
*/
if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
return;
}
mutex_lock(&dev_priv->backlight_lock);
if (panel->backlight.device)
panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
panel->backlight.enabled = false;
dev_priv->display.disable_backlight(connector);
mutex_unlock(&dev_priv->backlight_lock);
}
static void bdw_enable_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
u32 pch_ctl1, pch_ctl2;
pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
DRM_DEBUG_KMS("pch backlight already enabled\n");
pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
}
pch_ctl2 = panel->backlight.max << 16;
I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
pch_ctl1 = 0;
if (panel->backlight.active_low_pwm)
pch_ctl1 |= BLM_PCH_POLARITY;
/* After LPT, override is the default. */
if (HAS_PCH_LPT(dev_priv))
pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
POSTING_READ(BLC_PWM_PCH_CTL1);
I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
/* This won't stick until the above enable. */
intel_panel_actually_set_backlight(connector, panel->backlight.level);
}
static void pch_enable_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
enum transcoder cpu_transcoder =
intel_pipe_to_cpu_transcoder(dev_priv, pipe);
u32 cpu_ctl2, pch_ctl1, pch_ctl2;
cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
if (cpu_ctl2 & BLM_PWM_ENABLE) {
DRM_DEBUG_KMS("cpu backlight already enabled\n");
cpu_ctl2 &= ~BLM_PWM_ENABLE;
I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
}
pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
DRM_DEBUG_KMS("pch backlight already enabled\n");
pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
}
if (cpu_transcoder == TRANSCODER_EDP)
cpu_ctl2 = BLM_TRANSCODER_EDP;
else
cpu_ctl2 = BLM_PIPE(cpu_transcoder);
I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
POSTING_READ(BLC_PWM_CPU_CTL2);
I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
/* This won't stick until the above enable. */
intel_panel_actually_set_backlight(connector, panel->backlight.level);
pch_ctl2 = panel->backlight.max << 16;
I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
pch_ctl1 = 0;
if (panel->backlight.active_low_pwm)
pch_ctl1 |= BLM_PCH_POLARITY;
I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
POSTING_READ(BLC_PWM_PCH_CTL1);
I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
}
static void i9xx_enable_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
u32 ctl, freq;
ctl = I915_READ(BLC_PWM_CTL);
if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
DRM_DEBUG_KMS("backlight already enabled\n");
I915_WRITE(BLC_PWM_CTL, 0);
}
freq = panel->backlight.max;
if (panel->backlight.combination_mode)
freq /= 0xff;
ctl = freq << 17;
if (panel->backlight.combination_mode)
ctl |= BLM_LEGACY_MODE;
if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
ctl |= BLM_POLARITY_PNV;
I915_WRITE(BLC_PWM_CTL, ctl);
POSTING_READ(BLC_PWM_CTL);
/* XXX: combine this into above write? */
intel_panel_actually_set_backlight(connector, panel->backlight.level);
}
static void i965_enable_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 ctl, ctl2, freq;
ctl2 = I915_READ(BLC_PWM_CTL2);
if (ctl2 & BLM_PWM_ENABLE) {
DRM_DEBUG_KMS("backlight already enabled\n");
ctl2 &= ~BLM_PWM_ENABLE;
I915_WRITE(BLC_PWM_CTL2, ctl2);
}
freq = panel->backlight.max;
if (panel->backlight.combination_mode)
freq /= 0xff;
ctl = freq << 16;
I915_WRITE(BLC_PWM_CTL, ctl);
ctl2 = BLM_PIPE(pipe);
if (panel->backlight.combination_mode)
ctl2 |= BLM_COMBINATION_MODE;
if (panel->backlight.active_low_pwm)
ctl2 |= BLM_POLARITY_I965;
I915_WRITE(BLC_PWM_CTL2, ctl2);
POSTING_READ(BLC_PWM_CTL2);
I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
intel_panel_actually_set_backlight(connector, panel->backlight.level);
}
static void vlv_enable_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 ctl, ctl2;
ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
if (ctl2 & BLM_PWM_ENABLE) {
DRM_DEBUG_KMS("backlight already enabled\n");
ctl2 &= ~BLM_PWM_ENABLE;
I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
}
ctl = panel->backlight.max << 16;
I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
/* XXX: combine this into above write? */
intel_panel_actually_set_backlight(connector, panel->backlight.level);
ctl2 = 0;
if (panel->backlight.active_low_pwm)
ctl2 |= BLM_POLARITY_I965;
I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
}
void intel_panel_enable_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
if (!panel->backlight.present || pipe == INVALID_PIPE)
return;
DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
mutex_lock(&dev_priv->backlight_lock);
WARN_ON(panel->backlight.max == 0);
if (panel->backlight.level == 0) {
panel->backlight.level = panel->backlight.max;
if (panel->backlight.device)
panel->backlight.device->props.brightness =
scale_hw_to_user(connector,
panel->backlight.level,
panel->backlight.device->props.max_brightness);
}
dev_priv->display.enable_backlight(connector);
panel->backlight.enabled = true;
if (panel->backlight.device)
panel->backlight.device->props.power = FB_BLANK_UNBLANK;
mutex_unlock(&dev_priv->backlight_lock);
}
#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
static int intel_backlight_device_update_status(struct backlight_device *bd)
{
struct intel_connector *connector = bl_get_data(bd);
struct intel_panel *panel = &connector->panel;
struct drm_device *dev = connector->base.dev;
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
bd->props.brightness, bd->props.max_brightness);
intel_panel_set_backlight(connector, bd->props.brightness,
bd->props.max_brightness);
/*
* Allow flipping bl_power as a sub-state of enabled. Sadly the
* backlight class device does not make it easy to to differentiate
* between callbacks for brightness and bl_power, so our backlight_power
* callback needs to take this into account.
*/
if (panel->backlight.enabled) {
if (panel->backlight_power) {
bool enable = bd->props.power == FB_BLANK_UNBLANK &&
bd->props.brightness != 0;
panel->backlight_power(connector, enable);
}
} else {
bd->props.power = FB_BLANK_POWERDOWN;
}
drm_modeset_unlock(&dev->mode_config.connection_mutex);
return 0;
}
static int intel_backlight_device_get_brightness(struct backlight_device *bd)
{
struct intel_connector *connector = bl_get_data(bd);
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 hw_level;
int ret;
intel_runtime_pm_get(dev_priv);
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
hw_level = intel_panel_get_backlight(connector);
ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
drm_modeset_unlock(&dev->mode_config.connection_mutex);
intel_runtime_pm_put(dev_priv);
return ret;
}
static const struct backlight_ops intel_backlight_device_ops = {
.update_status = intel_backlight_device_update_status,
.get_brightness = intel_backlight_device_get_brightness,
};
static int intel_backlight_device_register(struct intel_connector *connector)
{
struct intel_panel *panel = &connector->panel;
struct backlight_properties props;
if (WARN_ON(panel->backlight.device))
return -ENODEV;
WARN_ON(panel->backlight.max == 0);
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
/*
* Note: Everything should work even if the backlight device max
* presented to the userspace is arbitrarily chosen.
*/
props.max_brightness = panel->backlight.max;
props.brightness = scale_hw_to_user(connector,
panel->backlight.level,
props.max_brightness);
if (panel->backlight.enabled)
props.power = FB_BLANK_UNBLANK;
else
props.power = FB_BLANK_POWERDOWN;
/*
* Note: using the same name independent of the connector prevents
* registration of multiple backlight devices in the driver.
*/
panel->backlight.device =
backlight_device_register("intel_backlight",
connector->base.kdev,
connector,
&intel_backlight_device_ops, &props);
if (IS_ERR(panel->backlight.device)) {
DRM_ERROR("Failed to register backlight: %ld\n",
PTR_ERR(panel->backlight.device));
panel->backlight.device = NULL;
return -ENODEV;
}
return 0;
}
static void intel_backlight_device_unregister(struct intel_connector *connector)
{
struct intel_panel *panel = &connector->panel;
if (panel->backlight.device) {
backlight_device_unregister(panel->backlight.device);
panel->backlight.device = NULL;
}
}
#else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
static int intel_backlight_device_register(struct intel_connector *connector)
{
return 0;
}
static void intel_backlight_device_unregister(struct intel_connector *connector)
{
}
#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
/*
* Note: The setup hooks can't assume pipe is set!
*
* XXX: Query mode clock or hardware clock and program PWM modulation frequency
* appropriately when it's 0. Use VBT and/or sane defaults.
*/
static u32 get_backlight_min_vbt(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
WARN_ON(panel->backlight.max == 0);
/* vbt value is a coefficient in range [0..255] */
return scale(dev_priv->vbt.backlight.min_brightness, 0, 255,
0, panel->backlight.max);
}
static int bdw_setup_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
u32 pch_ctl1, pch_ctl2, val;
pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
panel->backlight.max = pch_ctl2 >> 16;
if (!panel->backlight.max)
return -ENODEV;
panel->backlight.min = get_backlight_min_vbt(connector);
val = bdw_get_backlight(connector);
panel->backlight.level = intel_panel_compute_brightness(connector, val);
panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
panel->backlight.level != 0;
return 0;
}
static int pch_setup_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
panel->backlight.max = pch_ctl2 >> 16;
if (!panel->backlight.max)
return -ENODEV;
panel->backlight.min = get_backlight_min_vbt(connector);
val = pch_get_backlight(connector);
panel->backlight.level = intel_panel_compute_brightness(connector, val);
cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
(pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
return 0;
}
static int i9xx_setup_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
u32 ctl, val;
ctl = I915_READ(BLC_PWM_CTL);
if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
if (IS_PINEVIEW(dev))
panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
panel->backlight.max = ctl >> 17;
if (panel->backlight.combination_mode)
panel->backlight.max *= 0xff;
if (!panel->backlight.max)
return -ENODEV;
panel->backlight.min = get_backlight_min_vbt(connector);
val = i9xx_get_backlight(connector);
panel->backlight.level = intel_panel_compute_brightness(connector, val);
panel->backlight.enabled = panel->backlight.level != 0;
return 0;
}
static int i965_setup_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
u32 ctl, ctl2, val;
ctl2 = I915_READ(BLC_PWM_CTL2);
panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
ctl = I915_READ(BLC_PWM_CTL);
panel->backlight.max = ctl >> 16;
if (panel->backlight.combination_mode)
panel->backlight.max *= 0xff;
if (!panel->backlight.max)
return -ENODEV;
panel->backlight.min = get_backlight_min_vbt(connector);
val = i9xx_get_backlight(connector);
panel->backlight.level = intel_panel_compute_brightness(connector, val);
panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
panel->backlight.level != 0;
return 0;
}
static int vlv_setup_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe;
u32 ctl, ctl2, val;
for_each_pipe(dev_priv, pipe) {
u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
/* Skip if the modulation freq is already set */
if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
continue;
cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) |
cur_val);
}
ctl2 = I915_READ(VLV_BLC_PWM_CTL2(PIPE_A));
panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
ctl = I915_READ(VLV_BLC_PWM_CTL(PIPE_A));
panel->backlight.max = ctl >> 16;
if (!panel->backlight.max)
return -ENODEV;
panel->backlight.min = get_backlight_min_vbt(connector);
val = _vlv_get_backlight(dev, PIPE_A);
panel->backlight.level = intel_panel_compute_brightness(connector, val);
panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
panel->backlight.level != 0;
return 0;
}
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 intel_connector *intel_connector = to_intel_connector(connector);
struct intel_panel *panel = &intel_connector->panel;
int ret;
if (!dev_priv->vbt.backlight.present) {
if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
} else {
DRM_DEBUG_KMS("no backlight present per VBT\n");
return 0;
}
}
/* set level and max in panel struct */
mutex_lock(&dev_priv->backlight_lock);
ret = dev_priv->display.setup_backlight(intel_connector);
mutex_unlock(&dev_priv->backlight_lock);
if (ret) {
DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
connector->name);
return ret;
}
intel_backlight_device_register(intel_connector);
panel->backlight.present = true;
DRM_DEBUG_KMS("backlight initialized, %s, brightness %u/%u, "
"sysfs interface %sregistered\n",
panel->backlight.enabled ? "enabled" : "disabled",
panel->backlight.level, panel->backlight.max,
panel->backlight.device ? "" : "not ");
return 0;
}
void intel_panel_destroy_backlight(struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
struct intel_panel *panel = &intel_connector->panel;
panel->backlight.present = false;
intel_backlight_device_unregister(intel_connector);
}
/* Set up chip specific backlight functions */
void intel_panel_init_backlight_funcs(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (IS_BROADWELL(dev) || (INTEL_INFO(dev)->gen >= 9)) {
dev_priv->display.setup_backlight = bdw_setup_backlight;
dev_priv->display.enable_backlight = bdw_enable_backlight;
dev_priv->display.disable_backlight = pch_disable_backlight;
dev_priv->display.set_backlight = bdw_set_backlight;
dev_priv->display.get_backlight = bdw_get_backlight;
} else if (HAS_PCH_SPLIT(dev)) {
dev_priv->display.setup_backlight = pch_setup_backlight;
dev_priv->display.enable_backlight = pch_enable_backlight;
dev_priv->display.disable_backlight = pch_disable_backlight;
dev_priv->display.set_backlight = pch_set_backlight;
dev_priv->display.get_backlight = pch_get_backlight;
} else if (IS_VALLEYVIEW(dev)) {
dev_priv->display.setup_backlight = vlv_setup_backlight;
dev_priv->display.enable_backlight = vlv_enable_backlight;
dev_priv->display.disable_backlight = vlv_disable_backlight;
dev_priv->display.set_backlight = vlv_set_backlight;
dev_priv->display.get_backlight = vlv_get_backlight;
} else if (IS_GEN4(dev)) {
dev_priv->display.setup_backlight = i965_setup_backlight;
dev_priv->display.enable_backlight = i965_enable_backlight;
dev_priv->display.disable_backlight = i965_disable_backlight;
dev_priv->display.set_backlight = i9xx_set_backlight;
dev_priv->display.get_backlight = i9xx_get_backlight;
} else {
dev_priv->display.setup_backlight = i9xx_setup_backlight;
dev_priv->display.enable_backlight = i9xx_enable_backlight;
dev_priv->display.disable_backlight = i9xx_disable_backlight;
dev_priv->display.set_backlight = i9xx_set_backlight;
dev_priv->display.get_backlight = i9xx_get_backlight;
}
}
int intel_panel_init(struct intel_panel *panel,
struct drm_display_mode *fixed_mode,
struct drm_display_mode *downclock_mode)
{
panel->fixed_mode = fixed_mode;
panel->downclock_mode = downclock_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);
if (panel->downclock_mode)
drm_mode_destroy(intel_connector->base.dev,
panel->downclock_mode);
}
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