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android / kernel / omap / 21486af0f34d03b813b023d7a2b887b329f60486 / . / drivers / gpu / drm / i915 / intel_lvds.c
blob: 4324a326f98ee28f4d67936b7a4789556344c4fb [file] [log] [blame]
/*
* Copyright © 2006-2007 Intel Corporation
* Copyright (c) 2006 Dave Airlie <[email protected]>
*
* 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 <[email protected]>
* Dave Airlie <[email protected]>
* Jesse Barnes <[email protected]>
*/
#include <acpi/button.h>
#include <linux/dmi.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"
#include "drm_edid.h"
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"
#include <linux/acpi.h>
/* Private structure for the integrated LVDS support */
struct intel_lvds {
struct intel_encoder base;
struct edid *edid;
int fitting_mode;
u32 pfit_control;
u32 pfit_pgm_ratios;
bool pfit_dirty;
struct drm_display_mode *fixed_mode;
};
static struct intel_lvds *to_intel_lvds(struct drm_encoder *encoder)
{
return container_of(encoder, struct intel_lvds, base.base);
}
static struct intel_lvds *intel_attached_lvds(struct drm_connector *connector)
{
return container_of(intel_attached_encoder(connector),
struct intel_lvds, base);
}
/**
* Sets the power state for the panel.
*/
static void intel_lvds_set_power(struct intel_lvds *intel_lvds, bool on)
{
struct drm_device *dev = intel_lvds->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 ctl_reg, lvds_reg;
if (HAS_PCH_SPLIT(dev)) {
ctl_reg = PCH_PP_CONTROL;
lvds_reg = PCH_LVDS;
} else {
ctl_reg = PP_CONTROL;
lvds_reg = LVDS;
}
if (on) {
I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
intel_panel_set_backlight(dev, dev_priv->backlight_level);
} else {
dev_priv->backlight_level = intel_panel_get_backlight(dev);
intel_panel_set_backlight(dev, 0);
I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
if (intel_lvds->pfit_control) {
if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
DRM_ERROR("timed out waiting for panel to power off\n");
I915_WRITE(PFIT_CONTROL, 0);
intel_lvds->pfit_control = 0;
intel_lvds->pfit_dirty = false;
}
I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
}
POSTING_READ(lvds_reg);
}
static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
{
struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
if (mode == DRM_MODE_DPMS_ON)
intel_lvds_set_power(intel_lvds, true);
else
intel_lvds_set_power(intel_lvds, false);
/* XXX: We never power down the LVDS pairs. */
}
static int intel_lvds_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
struct drm_display_mode *fixed_mode = intel_lvds->fixed_mode;
if (mode->hdisplay > fixed_mode->hdisplay)
return MODE_PANEL;
if (mode->vdisplay > fixed_mode->vdisplay)
return MODE_PANEL;
return MODE_OK;
}
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 bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
struct drm_encoder *tmp_encoder;
u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
/* Should never happen!! */
if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
DRM_ERROR("Can't support LVDS on pipe A\n");
return false;
}
/* Should never happen!! */
list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
DRM_ERROR("Can't enable LVDS and another "
"encoder on the same pipe\n");
return false;
}
}
/*
* We have timings from the BIOS for the panel, put them in
* to the adjusted mode. The CRTC will be set up for this mode,
* with the panel scaling set up to source from the H/VDisplay
* of the original mode.
*/
intel_fixed_panel_mode(intel_lvds->fixed_mode, adjusted_mode);
if (HAS_PCH_SPLIT(dev)) {
intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
mode, adjusted_mode);
return true;
}
/* Make sure pre-965s set dither correctly */
if (INTEL_INFO(dev)->gen < 4) {
if (dev_priv->lvds_dither)
pfit_control |= PANEL_8TO6_DITHER_ENABLE;
}
/* Native modes don't need fitting */
if (adjusted_mode->hdisplay == mode->hdisplay &&
adjusted_mode->vdisplay == mode->vdisplay)
goto out;
/* 965+ wants fuzzy fitting */
if (INTEL_INFO(dev)->gen >= 4)
pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
PFIT_FILTER_FUZZY);
/*
* Enable automatic panel scaling for non-native modes so that they fill
* the screen. Should be enabled before the pipe is enabled, according
* to register description and PRM.
* Change the value here to see the borders for debugging
*/
I915_WRITE(BCLRPAT_A, 0);
I915_WRITE(BCLRPAT_B, 0);
switch (intel_lvds->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, mode->hdisplay);
centre_vertically(adjusted_mode, mode->vdisplay);
border = LVDS_BORDER_ENABLE;
break;
case DRM_MODE_SCALE_ASPECT:
/* Scale but preserve the aspect ratio */
if (INTEL_INFO(dev)->gen >= 4) {
u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
pfit_control |= PFIT_ENABLE;
/* 965+ is easy, it does everything in hw */
if (scaled_width > scaled_height)
pfit_control |= PFIT_SCALING_PILLAR;
else if (scaled_width < scaled_height)
pfit_control |= PFIT_SCALING_LETTER;
else
pfit_control |= PFIT_SCALING_AUTO;
} else {
u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
/*
* 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 / mode->vdisplay);
border = LVDS_BORDER_ENABLE;
if (mode->vdisplay != adjusted_mode->vdisplay) {
u32 bits = panel_fitter_scaling(mode->vdisplay, 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 / mode->hdisplay);
border = LVDS_BORDER_ENABLE;
if (mode->hdisplay != adjusted_mode->hdisplay) {
u32 bits = panel_fitter_scaling(mode->hdisplay, 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);
}
break;
case DRM_MODE_SCALE_FULLSCREEN:
/*
* Full scaling, even if it changes the aspect ratio.
* Fortunately this is all done for us in hw.
*/
pfit_control |= PFIT_ENABLE;
if (INTEL_INFO(dev)->gen >= 4)
pfit_control |= PFIT_SCALING_AUTO;
else
pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
VERT_INTERP_BILINEAR |
HORIZ_INTERP_BILINEAR);
break;
default:
break;
}
out:
if (pfit_control != intel_lvds->pfit_control ||
pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
intel_lvds->pfit_control = pfit_control;
intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
intel_lvds->pfit_dirty = true;
}
dev_priv->lvds_border_bits = border;
/*
* XXX: It would be nice to support lower refresh rates on the
* panels to reduce power consumption, and perhaps match the
* user's requested refresh rate.
*/
return true;
}
static void intel_lvds_prepare(struct drm_encoder *encoder)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
dev_priv->backlight_level = intel_panel_get_backlight(dev);
/* We try to do the minimum that is necessary in order to unlock
* the registers for mode setting.
*
* On Ironlake, this is quite simple as we just set the unlock key
* and ignore all subtleties. (This may cause some issues...)
*
* Prior to Ironlake, we must disable the pipe if we want to adjust
* the panel fitter. However at all other times we can just reset
* the registers regardless.
*/
if (HAS_PCH_SPLIT(dev)) {
I915_WRITE(PCH_PP_CONTROL,
I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
} else if (intel_lvds->pfit_dirty) {
I915_WRITE(PP_CONTROL,
(I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS)
& ~POWER_TARGET_ON);
} else {
I915_WRITE(PP_CONTROL,
I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
}
}
static void intel_lvds_commit(struct drm_encoder *encoder)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
if (dev_priv->backlight_level == 0)
dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
/* Undo any unlocking done in prepare to prevent accidental
* adjustment of the registers.
*/
if (HAS_PCH_SPLIT(dev)) {
u32 val = I915_READ(PCH_PP_CONTROL);
if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
I915_WRITE(PCH_PP_CONTROL, val & 0x3);
} else {
u32 val = I915_READ(PP_CONTROL);
if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
I915_WRITE(PP_CONTROL, val & 0x3);
}
/* Always do a full power on as we do not know what state
* we were left in.
*/
intel_lvds_set_power(intel_lvds, true);
}
static void intel_lvds_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
/*
* The LVDS pin pair will already have been turned on in the
* intel_crtc_mode_set since it has a large impact on the DPLL
* settings.
*/
if (HAS_PCH_SPLIT(dev))
return;
if (!intel_lvds->pfit_dirty)
return;
/*
* Enable automatic panel scaling so that non-native modes fill the
* screen. Should be enabled before the pipe is enabled, according to
* register description and PRM.
*/
DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
intel_lvds->pfit_control,
intel_lvds->pfit_pgm_ratios);
if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
DRM_ERROR("timed out waiting for panel to power off\n");
I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
intel_lvds->pfit_dirty = false;
}
/**
* Detect the LVDS connection.
*
* Since LVDS doesn't have hotlug, we use the lid as a proxy. Open means
* connected and closed means disconnected. We also send hotplug events as
* needed, using lid status notification from the input layer.
*/
static enum drm_connector_status
intel_lvds_detect(struct drm_connector *connector, bool force)
{
struct drm_device *dev = connector->dev;
enum drm_connector_status status = connector_status_connected;
/* ACPI lid methods were generally unreliable in this generation, so
* don't even bother.
*/
if (IS_GEN2(dev) || IS_GEN3(dev))
return connector_status_connected;
return status;
}
/**
* Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
*/
static int intel_lvds_get_modes(struct drm_connector *connector)
{
struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
struct drm_device *dev = connector->dev;
struct drm_display_mode *mode;
if (intel_lvds->edid)
return drm_add_edid_modes(connector, intel_lvds->edid);
mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
if (mode == 0)
return 0;
drm_mode_probed_add(connector, mode);
return 1;
}
static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
{
DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
return 1;
}
/* The GPU hangs up on these systems if modeset is performed on LID open */
static const struct dmi_system_id intel_no_modeset_on_lid[] = {
{
.callback = intel_no_modeset_on_lid_dmi_callback,
.ident = "Toshiba Tecra A11",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
},
},
{ } /* terminating entry */
};
/*
* Lid events. Note the use of 'modeset_on_lid':
* - we set it on lid close, and reset it on open
* - we use it as a "only once" bit (ie we ignore
* duplicate events where it was already properly
* set/reset)
* - the suspend/resume paths will also set it to
* zero, since they restore the mode ("lid open").
*/
static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
void *unused)
{
struct drm_i915_private *dev_priv =
container_of(nb, struct drm_i915_private, lid_notifier);
struct drm_device *dev = dev_priv->dev;
struct drm_connector *connector = dev_priv->int_lvds_connector;
/*
* check and update the status of LVDS connector after receiving
* the LID nofication event.
*/
if (connector)
connector->status = connector->funcs->detect(connector,
false);
/* Don't force modeset on machines where it causes a GPU lockup */
if (dmi_check_system(intel_no_modeset_on_lid))
return NOTIFY_OK;
if (!acpi_lid_open()) {
dev_priv->modeset_on_lid = 1;
return NOTIFY_OK;
}
if (!dev_priv->modeset_on_lid)
return NOTIFY_OK;
dev_priv->modeset_on_lid = 0;
mutex_lock(&dev->mode_config.mutex);
drm_helper_resume_force_mode(dev);
mutex_unlock(&dev->mode_config.mutex);
return NOTIFY_OK;
}
/**
* intel_lvds_destroy - unregister and free LVDS structures
* @connector: connector to free
*
* Unregister the DDC bus for this connector then free the driver private
* structure.
*/
static void intel_lvds_destroy(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
if (dev_priv->lid_notifier.notifier_call)
acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
static int intel_lvds_set_property(struct drm_connector *connector,
struct drm_property *property,
uint64_t value)
{
struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
struct drm_device *dev = connector->dev;
if (property == dev->mode_config.scaling_mode_property) {
struct drm_crtc *crtc = intel_lvds->base.base.crtc;
if (value == DRM_MODE_SCALE_NONE) {
DRM_DEBUG_KMS("no scaling not supported\n");
return -EINVAL;
}
if (intel_lvds->fitting_mode == value) {
/* the LVDS scaling property is not changed */
return 0;
}
intel_lvds->fitting_mode = value;
if (crtc && crtc->enabled) {
/*
* If the CRTC is enabled, the display will be changed
* according to the new panel fitting mode.
*/
drm_crtc_helper_set_mode(crtc, &crtc->mode,
crtc->x, crtc->y, crtc->fb);
}
}
return 0;
}
static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
.dpms = intel_lvds_dpms,
.mode_fixup = intel_lvds_mode_fixup,
.prepare = intel_lvds_prepare,
.mode_set = intel_lvds_mode_set,
.commit = intel_lvds_commit,
};
static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
.get_modes = intel_lvds_get_modes,
.mode_valid = intel_lvds_mode_valid,
.best_encoder = intel_best_encoder,
};
static const struct drm_connector_funcs intel_lvds_connector_funcs = {
.dpms = drm_helper_connector_dpms,
.detect = intel_lvds_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.set_property = intel_lvds_set_property,
.destroy = intel_lvds_destroy,
};
static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
.destroy = intel_encoder_destroy,
};
static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
{
DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
return 1;
}
/* These systems claim to have LVDS, but really don't */
static const struct dmi_system_id intel_no_lvds[] = {
{
.callback = intel_no_lvds_dmi_callback,
.ident = "Apple Mac Mini (Core series)",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
},
},
{
.callback = intel_no_lvds_dmi_callback,
.ident = "Apple Mac Mini (Core 2 series)",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
},
},
{
.callback = intel_no_lvds_dmi_callback,
.ident = "MSI IM-945GSE-A",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
},
},
{
.callback = intel_no_lvds_dmi_callback,
.ident = "Dell Studio Hybrid",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
},
},
{
.callback = intel_no_lvds_dmi_callback,
.ident = "AOpen Mini PC",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
},
},
{
.callback = intel_no_lvds_dmi_callback,
.ident = "AOpen Mini PC MP915",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
},
},
{
.callback = intel_no_lvds_dmi_callback,
.ident = "Aopen i945GTt-VFA",
.matches = {
DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
},
},
{
.callback = intel_no_lvds_dmi_callback,
.ident = "Clientron U800",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
},
},
{ } /* terminating entry */
};
/**
* intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
* @dev: drm device
* @connector: LVDS connector
*
* Find the reduced downclock for LVDS in EDID.
*/
static void intel_find_lvds_downclock(struct drm_device *dev,
struct drm_display_mode *fixed_mode,
struct drm_connector *connector)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_display_mode *scan;
int temp_downclock;
temp_downclock = fixed_mode->clock;
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 for the LVDS. 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;
}
}
}
if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
/* We found the downclock for LVDS. */
dev_priv->lvds_downclock_avail = 1;
dev_priv->lvds_downclock = temp_downclock;
DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
"Normal clock %dKhz, downclock %dKhz\n",
fixed_mode->clock, temp_downclock);
}
}
/*
* Enumerate the child dev array parsed from VBT to check whether
* the LVDS is present.
* If it is present, return 1.
* If it is not present, return false.
* If no child dev is parsed from VBT, it assumes that the LVDS is present.
*/
static bool lvds_is_present_in_vbt(struct drm_device *dev,
u8 *i2c_pin)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int i;
if (!dev_priv->child_dev_num)
return true;
for (i = 0; i < dev_priv->child_dev_num; i++) {
struct child_device_config *child = dev_priv->child_dev + i;
/* If the device type is not LFP, continue.
* We have to check both the new identifiers as well as the
* old for compatibility with some BIOSes.
*/
if (child->device_type != DEVICE_TYPE_INT_LFP &&
child->device_type != DEVICE_TYPE_LFP)
continue;
if (child->i2c_pin)
*i2c_pin = child->i2c_pin;
/* However, we cannot trust the BIOS writers to populate
* the VBT correctly. Since LVDS requires additional
* information from AIM blocks, a non-zero addin offset is
* a good indicator that the LVDS is actually present.
*/
if (child->addin_offset)
return true;
/* But even then some BIOS writers perform some black magic
* and instantiate the device without reference to any
* additional data. Trust that if the VBT was written into
* the OpRegion then they have validated the LVDS's existence.
*/
if (dev_priv->opregion.vbt)
return true;
}
return false;
}
static bool intel_lvds_ddc_probe(struct drm_device *dev, u8 pin)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u8 buf = 0;
struct i2c_msg msgs[] = {
{
.addr = 0xA0,
.flags = 0,
.len = 1,
.buf = &buf,
},
};
struct i2c_adapter *i2c = &dev_priv->gmbus[pin].adapter;
/* XXX this only appears to work when using GMBUS */
if (intel_gmbus_is_forced_bit(i2c))
return true;
return i2c_transfer(i2c, msgs, 1) == 1;
}
/**
* intel_lvds_init - setup LVDS connectors on this device
* @dev: drm device
*
* Create the connector, register the LVDS DDC bus, and try to figure out what
* modes we can display on the LVDS panel (if present).
*/
void intel_lvds_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_lvds *intel_lvds;
struct intel_encoder *intel_encoder;
struct intel_connector *intel_connector;
struct drm_connector *connector;
struct drm_encoder *encoder;
struct drm_display_mode *scan; /* *modes, *bios_mode; */
struct drm_crtc *crtc;
u32 lvds;
int pipe;
u8 pin;
/* Skip init on machines we know falsely report LVDS */
if (dmi_check_system(intel_no_lvds))
return;
pin = GMBUS_PORT_PANEL;
if (!lvds_is_present_in_vbt(dev, &pin)) {
DRM_DEBUG_KMS("LVDS is not present in VBT\n");
return;
}
if (HAS_PCH_SPLIT(dev)) {
if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
return;
if (dev_priv->edp.support) {
DRM_DEBUG_KMS("disable LVDS for eDP support\n");
return;
}
}
if (!intel_lvds_ddc_probe(dev, pin)) {
DRM_DEBUG_KMS("LVDS did not respond to DDC probe\n");
return;
}
intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
if (!intel_lvds) {
return;
}
intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
if (!intel_connector) {
kfree(intel_lvds);
return;
}
if (!HAS_PCH_SPLIT(dev)) {
intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
}
intel_encoder = &intel_lvds->base;
encoder = &intel_encoder->base;
connector = &intel_connector->base;
drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
DRM_MODE_CONNECTOR_LVDS);
drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
DRM_MODE_ENCODER_LVDS);
intel_connector_attach_encoder(intel_connector, intel_encoder);
intel_encoder->type = INTEL_OUTPUT_LVDS;
intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
intel_encoder->crtc_mask = (1 << 1);
drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
connector->display_info.subpixel_order = SubPixelHorizontalRGB;
connector->interlace_allowed = false;
connector->doublescan_allowed = false;
/* create the scaling mode property */
drm_mode_create_scaling_mode_property(dev);
/*
* the initial panel fitting mode will be FULL_SCREEN.
*/
drm_connector_attach_property(&intel_connector->base,
dev->mode_config.scaling_mode_property,
DRM_MODE_SCALE_ASPECT);
intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
/*
* LVDS discovery:
* 1) check for EDID on DDC
* 2) check for VBT data
* 3) check to see if LVDS is already on
* if none of the above, no panel
* 4) make sure lid is open
* if closed, act like it's not there for now
*/
/*
* Attempt to get the fixed panel mode from DDC. Assume that the
* preferred mode is the right one.
*/
intel_lvds->edid = drm_get_edid(connector,
&dev_priv->gmbus[pin].adapter);
if (intel_lvds->edid) {
if (drm_add_edid_modes(connector,
intel_lvds->edid)) {
drm_mode_connector_update_edid_property(connector,
intel_lvds->edid);
} else {
kfree(intel_lvds->edid);
intel_lvds->edid = NULL;
}
}
if (!intel_lvds->edid) {
/* Didn't get an EDID, so
* Set wide sync ranges so we get all modes
* handed to valid_mode for checking
*/
connector->display_info.min_vfreq = 0;
connector->display_info.max_vfreq = 200;
connector->display_info.min_hfreq = 0;
connector->display_info.max_hfreq = 200;
}
list_for_each_entry(scan, &connector->probed_modes, head) {
if (scan->type & DRM_MODE_TYPE_PREFERRED) {
intel_lvds->fixed_mode =
drm_mode_duplicate(dev, scan);
intel_find_lvds_downclock(dev,
intel_lvds->fixed_mode,
connector);
goto out;
}
}
/* Failed to get EDID, what about VBT? */
if (dev_priv->lfp_lvds_vbt_mode) {
intel_lvds->fixed_mode =
drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
if (intel_lvds->fixed_mode) {
intel_lvds->fixed_mode->type |=
DRM_MODE_TYPE_PREFERRED;
goto out;
}
}
/*
* If we didn't get EDID, try checking if the panel is already turned
* on. If so, assume that whatever is currently programmed is the
* correct mode.
*/
/* Ironlake: FIXME if still fail, not try pipe mode now */
if (HAS_PCH_SPLIT(dev))
goto failed;
lvds = I915_READ(LVDS);
pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
crtc = intel_get_crtc_for_pipe(dev, pipe);
if (crtc && (lvds & LVDS_PORT_EN)) {
intel_lvds->fixed_mode = intel_crtc_mode_get(dev, crtc);
if (intel_lvds->fixed_mode) {
intel_lvds->fixed_mode->type |=
DRM_MODE_TYPE_PREFERRED;
goto out;
}
}
/* If we still don't have a mode after all that, give up. */
if (!intel_lvds->fixed_mode)
goto failed;
out:
if (HAS_PCH_SPLIT(dev)) {
u32 pwm;
/* make sure PWM is enabled */
pwm = I915_READ(BLC_PWM_CPU_CTL2);
pwm |= (PWM_ENABLE | PWM_PIPE_B);
I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
pwm = I915_READ(BLC_PWM_PCH_CTL1);
pwm |= PWM_PCH_ENABLE;
I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
}
dev_priv->lid_notifier.notifier_call = intel_lid_notify;
if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
DRM_DEBUG_KMS("lid notifier registration failed\n");
dev_priv->lid_notifier.notifier_call = NULL;
}
/* keep the LVDS connector */
dev_priv->int_lvds_connector = connector;
drm_sysfs_connector_add(connector);
return;
failed:
DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
drm_connector_cleanup(connector);
drm_encoder_cleanup(encoder);
kfree(intel_lvds);
kfree(intel_connector);
}