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drm/linux-core/intel_lvds.c

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/*
* Copyright © 2006-2007 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>
*/
#include <linux/i2c.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"
/**
* Sets the backlight level.
*
* \param level backlight level, from 0 to intel_lvds_get_max_backlight().
*/
static void intel_lvds_set_backlight(struct drm_device *dev, int level)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 blc_pwm_ctl;
blc_pwm_ctl = I915_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
I915_WRITE(BLC_PWM_CTL, (blc_pwm_ctl |
(level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
}
/**
* Returns the maximum level of the backlight duty cycle field.
*/
static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
return ((I915_READ(BLC_PWM_CTL) & BACKLIGHT_MODULATION_FREQ_MASK) >>
BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
}
/**
* Sets the power state for the panel.
*/
static void intel_lvds_set_power(struct drm_device *dev, bool on)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp_status;
if (on) {
I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) |
POWER_TARGET_ON);
do {
pp_status = I915_READ(PP_STATUS);
} while ((pp_status & PP_ON) == 0);
intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
} else {
intel_lvds_set_backlight(dev, 0);
I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) &
~POWER_TARGET_ON);
do {
pp_status = I915_READ(PP_STATUS);
} while (pp_status & PP_ON);
}
}
static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
{
struct drm_device *dev = encoder->dev;
if (mode == DRM_MODE_DPMS_ON)
intel_lvds_set_power(dev, true);
else
intel_lvds_set_power(dev, false);
/* XXX: We never power down the LVDS pairs. */
}
static void intel_lvds_save(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
dev_priv->savePP_ON = I915_READ(PP_ON_DELAYS);
dev_priv->savePP_OFF = I915_READ(PP_OFF_DELAYS);
dev_priv->savePP_CONTROL = I915_READ(PP_CONTROL);
dev_priv->savePP_DIVISOR = I915_READ(PP_DIVISOR);
dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
BACKLIGHT_DUTY_CYCLE_MASK);
/*
* If the light is off at server startup, just make it full brightness
*/
if (dev_priv->backlight_duty_cycle == 0)
dev_priv->backlight_duty_cycle =
intel_lvds_get_max_backlight(dev);
}
static void intel_lvds_restore(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
I915_WRITE(BLC_PWM_CTL, dev_priv->saveBLC_PWM_CTL);
I915_WRITE(PP_ON_DELAYS, dev_priv->savePP_ON);
I915_WRITE(PP_OFF_DELAYS, dev_priv->savePP_OFF);
I915_WRITE(PP_DIVISOR, dev_priv->savePP_DIVISOR);
I915_WRITE(PP_CONTROL, dev_priv->savePP_CONTROL);
if (dev_priv->savePP_CONTROL & POWER_TARGET_ON)
intel_lvds_set_power(dev, true);
else
intel_lvds_set_power(dev, false);
}
static int intel_lvds_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct drm_device *dev = connector->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
if (fixed_mode) {
if (mode->hdisplay > fixed_mode->hdisplay)
return MODE_PANEL;
if (mode->vdisplay > fixed_mode->vdisplay)
return MODE_PANEL;
}
return MODE_OK;
}
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 drm_encoder *tmp_encoder;
/* Should never happen!! */
if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
printk(KERN_ERR "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) {
printk(KERN_ERR "Can't enable LVDS and another "
"encoder on the same pipe\n");
return false;
}
}
/*
* If 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.
*/
if (dev_priv->panel_fixed_mode != NULL) {
adjusted_mode->hdisplay = dev_priv->panel_fixed_mode->hdisplay;
adjusted_mode->hsync_start =
dev_priv->panel_fixed_mode->hsync_start;
adjusted_mode->hsync_end =
dev_priv->panel_fixed_mode->hsync_end;
adjusted_mode->htotal = dev_priv->panel_fixed_mode->htotal;
adjusted_mode->vdisplay = dev_priv->panel_fixed_mode->vdisplay;
adjusted_mode->vsync_start =
dev_priv->panel_fixed_mode->vsync_start;
adjusted_mode->vsync_end =
dev_priv->panel_fixed_mode->vsync_end;
adjusted_mode->vtotal = dev_priv->panel_fixed_mode->vtotal;
adjusted_mode->clock = dev_priv->panel_fixed_mode->clock;
drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
}
/*
* 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;
dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
BACKLIGHT_DUTY_CYCLE_MASK);
intel_lvds_set_power(dev, false);
}
static void intel_lvds_commit( struct drm_encoder *encoder)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
if (dev_priv->backlight_duty_cycle == 0)
dev_priv->backlight_duty_cycle =
intel_lvds_get_max_backlight(dev);
intel_lvds_set_power(dev, 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_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
u32 pfit_control;
/*
* 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.
*/
/*
* 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.
*/
if (mode->hdisplay != adjusted_mode->hdisplay ||
mode->vdisplay != adjusted_mode->vdisplay)
pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
HORIZ_INTERP_BILINEAR);
else
pfit_control = 0;
if (!IS_I965G(dev)) {
if (dev_priv->panel_wants_dither)
pfit_control |= PANEL_8TO6_DITHER_ENABLE;
}
else
pfit_control |= intel_crtc->pipe << PFIT_PIPE_SHIFT;
I915_WRITE(PFIT_CONTROL, pfit_control);
}
/**
* Detect the LVDS connection.
*
* This always returns CONNECTOR_STATUS_CONNECTED. This connector should only have
* been set up if the LVDS was actually connected anyway.
*/
static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
{
return connector_status_connected;
}
/**
* 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 drm_device *dev = connector->dev;
struct intel_output *intel_output = to_intel_output(connector);
struct drm_i915_private *dev_priv = dev->dev_private;
int ret = 0;
ret = intel_ddc_get_modes(intel_output);
if (ret)
return ret;
/* 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;
if (dev_priv->panel_fixed_mode != NULL) {
struct drm_display_mode *mode =
drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
drm_mode_probed_add(connector, mode);
return 1;
}
return 0;
}
/**
* 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 intel_output *intel_output = to_intel_output(connector);
if (intel_output->ddc_bus)
intel_i2c_destroy(intel_output->ddc_bus);
drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
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 = {
.save = intel_lvds_save,
.restore = intel_lvds_restore,
.detect = intel_lvds_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = intel_lvds_destroy,
};
static void intel_lvds_enc_destroy(struct drm_encoder *encoder)
{
drm_encoder_cleanup(encoder);
}
static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
.destroy = intel_lvds_enc_destroy,
};
/**
* 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_output *intel_output;
struct drm_connector *connector;
struct drm_encoder *encoder;
struct drm_display_mode *scan; /* *modes, *bios_mode; */
struct drm_crtc *crtc;
u32 lvds;
int pipe;
intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
if (!intel_output) {
return;
}
connector = &intel_output->base;
encoder = &intel_output->enc;
drm_connector_init(dev, &intel_output->base, &intel_lvds_connector_funcs,
DRM_MODE_CONNECTOR_LVDS);
drm_encoder_init(dev, &intel_output->enc, &intel_lvds_enc_funcs,
DRM_MODE_ENCODER_LVDS);
drm_mode_connector_attach_encoder(&intel_output->base, &intel_output->enc);
intel_output->type = INTEL_OUTPUT_LVDS;
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;
/*
* 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
*/
/* Set up the DDC bus. */
intel_output->ddc_bus = intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
if (!intel_output->ddc_bus) {
dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
"failed.\n");
goto failed;
}
/*
* Attempt to get the fixed panel mode from DDC. Assume that the
* preferred mode is the right one.
*/
intel_ddc_get_modes(intel_output);
list_for_each_entry(scan, &connector->probed_modes, head) {
if (scan->type & DRM_MODE_TYPE_PREFERRED) {
dev_priv->panel_fixed_mode =
drm_mode_duplicate(dev, scan);
goto out; /* FIXME: check for quirks */
}
}
/* Failed to get EDID, what about VBT? */
if (dev_priv->vbt_mode)
dev_priv->panel_fixed_mode =
drm_mode_duplicate(dev, dev_priv->vbt_mode);
/*
* 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.
*/
lvds = I915_READ(LVDS);
pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
crtc = intel_get_crtc_from_pipe(dev, pipe);
if (crtc && (lvds & LVDS_PORT_EN)) {
dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
if (dev_priv->panel_fixed_mode) {
dev_priv->panel_fixed_mode->type |=
DRM_MODE_TYPE_PREFERRED;
goto out; /* FIXME: check for quirks */
}
}
/* If we still don't have a mode after all that, give up. */
if (!dev_priv->panel_fixed_mode)
goto failed;
/* FIXME: detect aopen & mac mini type stuff automatically? */
/*
* Blacklist machines with BIOSes that list an LVDS panel without
* actually having one.
*/
if (IS_I945GM(dev)) {
/* aopen mini pc */
if (dev->pdev->subsystem_vendor == 0xa0a0)
goto failed;
if ((dev->pdev->subsystem_vendor == 0x8086) &&
(dev->pdev->subsystem_device == 0x7270)) {
/* It's a Mac Mini or Macbook Pro.
*
* Apple hardware is out to get us. The macbook pro
* has a real LVDS panel, but the mac mini does not,
* and they have the same device IDs. We'll
* distinguish by panel size, on the assumption
* that Apple isn't about to make any machines with an
* 800x600 display.
*/
if (dev_priv->panel_fixed_mode != NULL &&
dev_priv->panel_fixed_mode->hdisplay == 800 &&
dev_priv->panel_fixed_mode->vdisplay == 600) {
DRM_DEBUG("Suspected Mac Mini, ignoring the LVDS\n");
goto failed;
}
}
}
out:
drm_sysfs_connector_add(connector);
return;
failed:
DRM_DEBUG("No LVDS modes found, disabling.\n");
if (intel_output->ddc_bus)
intel_i2c_destroy(intel_output->ddc_bus);
drm_connector_cleanup(connector);
kfree(connector);
}
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