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/*

 * Copyright (c) 2006-2008 Intel Corporation

 * Copyright (c) 2007 Dave Airlie 

 *

 * DRM core CRTC related functions

 *

 * Permission to use, copy, modify, distribute, and sell this software and its

 * documentation for any purpose is hereby granted without fee, provided that

 * the above copyright notice appear in all copies and that both that copyright

 * notice and this permission notice appear in supporting documentation, and

 * that the name of the copyright holders not be used in advertising or

 * publicity pertaining to distribution of the software without specific,

 * written prior permission.  The copyright holders make no representations

 * about the suitability of this software for any purpose.  It is provided "as

 * is" without express or implied warranty.

 *

 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,

 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO

 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR

 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,

 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER

 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE

 * OF THIS SOFTWARE.

 *

 * Authors:

 *      Keith Packard

 *	Eric Anholt 

 *      Dave Airlie 

 *      Jesse Barnes 

 */

#include "drmP.h"

#include "drm_crtc.h"

#include "drm_crtc_helper.h"

#include "drm_fb_helper.h"

static void drm_mode_validate_flag(struct drm_connector *connector,

				   int flags)

{

	struct drm_display_mode *mode, *t;

	if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))

		return;

	list_for_each_entry_safe(mode, t, &connector->modes, head) {

		if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&

				!(flags & DRM_MODE_FLAG_INTERLACE))

			mode->status = MODE_NO_INTERLACE;

		if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&

				!(flags & DRM_MODE_FLAG_DBLSCAN))

			mode->status = MODE_NO_DBLESCAN;

	}

	return;

}

/**

 * drm_helper_probe_connector_modes - get complete set of display modes

 * @dev: DRM device

 * @maxX: max width for modes

 * @maxY: max height for modes

 *

 * LOCKING:

 * Caller must hold mode config lock.

 *

 * Based on @dev's mode_config layout, scan all the connectors and try to detect

 * modes on them.  Modes will first be added to the connector's probed_modes

 * list, then culled (based on validity and the @maxX, @maxY parameters) and

 * put into the normal modes list.

 *

 * Intended to be used either at bootup time or when major configuration

 * changes have occurred.

 *

 * FIXME: take into account monitor limits

 *

 * RETURNS:

 * Number of modes found on @connector.

 */

int drm_helper_probe_single_connector_modes(struct drm_connector *connector,

					    uint32_t maxX, uint32_t maxY)

{

	struct drm_device *dev = connector->dev;

	struct drm_display_mode *mode, *t;

	struct drm_connector_helper_funcs *connector_funcs =

		connector->helper_private;

	int count = 0;

	int mode_flags = 0;

	DRM_DEBUG_KMS("%s\n", drm_get_connector_name(connector));

	/* set all modes to the unverified state */

	list_for_each_entry_safe(mode, t, &connector->modes, head)

		mode->status = MODE_UNVERIFIED;

	if (connector->force) {

		if (connector->force == DRM_FORCE_ON)

			connector->status = connector_status_connected;

		else

			connector->status = connector_status_disconnected;

		if (connector->funcs->force)

			connector->funcs->force(connector);

	} else

	connector->status = connector->funcs->detect(connector);

	if (connector->status == connector_status_disconnected) {

		DRM_DEBUG_KMS("%s is disconnected\n",

			  drm_get_connector_name(connector));

		goto prune;

	}

	count = (*connector_funcs->get_modes)(connector);

	if (!count) {

		count = drm_add_modes_noedid(connector, 1024, 768);

	if (!count)

		return 0;

	}

	drm_mode_connector_list_update(connector);

	if (maxX && maxY)

		drm_mode_validate_size(dev, &connector->modes, maxX,

				       maxY, 0);

	if (connector->interlace_allowed)

		mode_flags |= DRM_MODE_FLAG_INTERLACE;

	if (connector->doublescan_allowed)

		mode_flags |= DRM_MODE_FLAG_DBLSCAN;

	drm_mode_validate_flag(connector, mode_flags);

	list_for_each_entry_safe(mode, t, &connector->modes, head) {

		if (mode->status == MODE_OK)

			mode->status = connector_funcs->mode_valid(connector,

								   mode);

	}

prune:

	drm_mode_prune_invalid(dev, &connector->modes, true);

	if (list_empty(&connector->modes))

		return 0;

	drm_mode_sort(&connector->modes);

	DRM_DEBUG_KMS("Probed modes for %s\n",

				drm_get_connector_name(connector));

	list_for_each_entry_safe(mode, t, &connector->modes, head) {

		mode->vrefresh = drm_mode_vrefresh(mode);

		drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);

		drm_mode_debug_printmodeline(mode);

	}

	return count;

}

EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);

int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,

				      uint32_t maxY)

{

	struct drm_connector *connector;

	int count = 0;

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {

		count += drm_helper_probe_single_connector_modes(connector,

								 maxX, maxY);

	}

	return count;

}

EXPORT_SYMBOL(drm_helper_probe_connector_modes);

/**

 * drm_helper_encoder_in_use - check if a given encoder is in use

 * @encoder: encoder to check

 *

 * LOCKING:

 * Caller must hold mode config lock.

 *

 * Walk @encoders's DRM device's mode_config and see if it's in use.

 *

 * RETURNS:

 * True if @encoder is part of the mode_config, false otherwise.

 */

bool drm_helper_encoder_in_use(struct drm_encoder *encoder)

{

	struct drm_connector *connector;

	struct drm_device *dev = encoder->dev;

	list_for_each_entry(connector, &dev->mode_config.connector_list, head)

		if (connector->encoder == encoder)

			return true;

	return false;

}

EXPORT_SYMBOL(drm_helper_encoder_in_use);

/**

 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config

 * @crtc: CRTC to check

 *

 * LOCKING:

 * Caller must hold mode config lock.

 *

 * Walk @crtc's DRM device's mode_config and see if it's in use.

 *

 * RETURNS:

 * True if @crtc is part of the mode_config, false otherwise.

 */

bool drm_helper_crtc_in_use(struct drm_crtc *crtc)

{

	struct drm_encoder *encoder;

	struct drm_device *dev = crtc->dev;

	/* FIXME: Locking around list access? */

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)

		if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))

			return true;

	return false;

}

EXPORT_SYMBOL(drm_helper_crtc_in_use);

/**

 * drm_disable_unused_functions - disable unused objects

 * @dev: DRM device

 *

 * LOCKING:

 * Caller must hold mode config lock.

 *

 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled

 * by calling its dpms function, which should power it off.

 */

void drm_helper_disable_unused_functions(struct drm_device *dev)

{

	struct drm_encoder *encoder;

	struct drm_connector *connector;

	struct drm_encoder_helper_funcs *encoder_funcs;

	struct drm_crtc *crtc;

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {

		if (!connector->encoder)

			continue;

		if (connector->status == connector_status_disconnected)

			connector->encoder = NULL;

	}

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {

		encoder_funcs = encoder->helper_private;

		if (!drm_helper_encoder_in_use(encoder)) {

			if (encoder_funcs->disable)

				(*encoder_funcs->disable)(encoder);

			else