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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 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

/**

 * DOC: output probing helper overview

 *

 * This library provides some helper code for output probing. It provides an

 * implementation of the core connector->fill_modes interface with

 * drm_helper_probe_single_connector_modes.

 *

 * It also provides support for polling connectors with a work item and for

 * generic hotplug interrupt handling where the driver doesn't or cannot keep

 * track of a per-connector hpd interrupt.

 *

 * This helper library can be used independently of the modeset helper library.

 * Drivers can also overwrite different parts e.g. use their own hotplug

 * handling code to avoid probing unrelated outputs.

 *

 * The probe helpers share the function table structures with other display

 * helper libraries. See struct &drm_connector_helper_funcs for the details.

 */

static bool drm_kms_helper_poll = true;

module_param_named(poll, drm_kms_helper_poll, bool, 0600);

static enum drm_mode_status

drm_mode_validate_flag(const struct drm_display_mode *mode,

		       int flags)

{

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

	    !(flags & DRM_MODE_FLAG_INTERLACE))

		return MODE_NO_INTERLACE;

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

	    !(flags & DRM_MODE_FLAG_DBLSCAN))

		return MODE_NO_DBLESCAN;

	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&

	    !(flags & DRM_MODE_FLAG_3D_MASK))

		return MODE_NO_STEREO;

	return MODE_OK;

}

static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)

{

	struct drm_display_mode *mode;

	if (!connector->cmdline_mode.specified)

		return 0;

	mode = drm_mode_create_from_cmdline_mode(connector->dev,

						 &connector->cmdline_mode);

	if (mode == NULL)

		return 0;

	drm_mode_probed_add(connector, mode);

	return 1;

}

#define DRM_OUTPUT_POLL_PERIOD (10*HZ)

/**

 * drm_kms_helper_poll_enable_locked - re-enable output polling.

 * @dev: drm_device

 *

 * This function re-enables the output polling work without

 * locking the mode_config mutex.

 *

 * This is like drm_kms_helper_poll_enable() however it is to be

 * called from a context where the mode_config mutex is locked

 * already.

 */

void drm_kms_helper_poll_enable_locked(struct drm_device *dev)

{

	bool poll = false;

	struct drm_connector *connector;

	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));

	if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)

		return;

	drm_for_each_connector(connector, dev) {

		if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |

					 DRM_CONNECTOR_POLL_DISCONNECT))

			poll = true;

	}

	if (poll)

		schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);

}

EXPORT_SYMBOL(drm_kms_helper_poll_enable_locked);

/**

 * drm_helper_probe_single_connector_modes - get complete set of display modes

 * @connector: connector to probe

 * @maxX: max width for modes

 * @maxY: max height for modes

 *

 * Based on the helper callbacks implemented by @connector in struct

 * &drm_connector_helper_funcs try to detect all valid modes.  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 as a generic implementation of the ->fill_modes()

 * @connector vfunc for drivers that use the CRTC helpers for output mode

 * filtering and detection.

 *

 * The basic procedure is as follows

 *

 * 1. All modes currently on the connector's modes list are marked as stale

 *

 * 2. New modes are added to the connector's probed_modes list with

 *    drm_mode_probed_add(). New modes start their life with status as OK.

 *    Modes are added from a single source using the following priority order.

 *

 *    - debugfs 'override_edid' (used for testing only)

 *    - firmware EDID (drm_load_edid_firmware())

 *    - connector helper ->get_modes() vfunc

 *    - if the connector status is connector_status_connected, standard

 *      VESA DMT modes up to 1024x768 are automatically added

 *      (drm_add_modes_noedid())

 *

 *    Finally modes specified via the kernel command line (video=...) are

 *    added in addition to what the earlier probes produced

 *    (drm_helper_probe_add_cmdline_mode()). These modes are generated

 *    using the VESA GTF/CVT formulas.

 *

 * 3. Modes are moved from the probed_modes list to the modes list. Potential

 *    duplicates are merged together (see drm_mode_connector_list_update()).

 *    After this step the probed_modes list will be empty again.

 *

 * 4. Any non-stale mode on the modes list then undergoes validation

 *

 *    - drm_mode_validate_basic() performs basic sanity checks

 *    - drm_mode_validate_size() filters out modes larger than @maxX and @maxY

 *      (if specified)

 *    - drm_mode_validate_flag() checks the modes againt basic connector

 *      capabilites (interlace_allowed,doublescan_allowed,stereo_allowed)

 *    - the optional connector ->mode_valid() helper can perform driver and/or

 *      hardware specific checks

 *

 * 5. Any mode whose status is not OK is pruned from the connector's modes list,

 *    accompanied by a debug message indicating the reason for the mode's

 *    rejection (see drm_mode_prune_invalid()).

 *

 * Returns:

 * The 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;

	const struct drm_connector_helper_funcs *connector_funcs =

		connector->helper_private;

	int count = 0;

	int mode_flags = 0;

	bool verbose_prune = true;

	enum drm_connector_status old_status;

	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));

	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,

			connector->name);

	/* set all old modes to the stale state */

	list_for_each_entry(mode, &connector->modes, head)

		mode->status = MODE_STALE;

	old_status = connector->status;

	if (connector->force) {

		if (connector->force == DRM_FORCE_ON ||

		    connector->force == DRM_FORCE_ON_DIGITAL)

			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, true);

	}

	/*

	 * Normally either the driver's hpd code or the poll loop should

	 * pick up any changes and fire the hotplug event. But if

	 * userspace sneaks in a probe, we might miss a change. Hence

	 * check here, and if anything changed start the hotplug code.

	 */

	if (old_status != connector->status) {

		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",

			      connector->base.id,

			      connector->name,

			      drm_get_connector_status_name(old_status),

			      drm_get_connector_status_name(connector->status));

		/*

		 * The hotplug event code might call into the fb

		 * helpers, and so expects that we do not hold any

		 * locks. Fire up the poll struct instead, it will

		 * disable itself again.

		 */

		dev->mode_config.delayed_event = true;

		if (dev->mode_config.poll_enabled)

			schedule_delayed_work(&dev->mode_config.output_poll_work,

					      0);

	}

	/* Re-enable polling in case the global poll config changed. */

	if (drm_kms_helper_poll != dev->mode_config.poll_running)

		drm_kms_helper_poll_enable_locked(dev);

	dev->mode_config.poll_running = drm_kms_helper_poll;

	if (connector->status == connector_status_disconnected) {

		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",

			connector->base.id, connector->name);

		drm_mode_connector_update_edid_property(connector, NULL);

		verbose_prune = false;

		goto prune;

	}

	if (connector->override_edid) {

		struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;

		count = drm_add_edid_modes(connector, edid);

		drm_edid_to_eld(connector, edid);

	} else {

#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE

		count = drm_load_edid_firmware(connector);

		if (count == 0)

#endif

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

	}

	if (count == 0 && connector->status == connector_status_connected)

		count = drm_add_modes_noedid(connector, 1024, 768);

	count += drm_helper_probe_add_cmdline_mode(connector);

	if (count == 0)

		goto prune;

	drm_mode_connector_list_update(connector);

	if (connector->interlace_allowed)

		mode_flags |= DRM_MODE_FLAG_INTERLACE;

	if (connector->doublescan_allowed)

		mode_flags |= DRM_MODE_FLAG_DBLSCAN;

	if (connector->stereo_allowed)

		mode_flags |= DRM_MODE_FLAG_3D_MASK;

	list_for_each_entry(mode, &connector->modes, head) {

		if (mode->status == MODE_OK)

			mode->status = drm_mode_validate_basic(mode);

		if (mode->status == MODE_OK)

			mode->status = drm_mode_validate_size(mode, maxX, maxY);

		if (mode->status == MODE_OK)

			mode->status = drm_mode_validate_flag(mode, mode_flags);

		if (mode->status == MODE_OK && connector_funcs->mode_valid)

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

								   mode);

	}

prune:

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

	if (list_empty(&connector->modes))

		return 0;

	list_for_each_entry(mode, &connector->modes, head)

		mode->vrefresh = drm_mode_vrefresh(mode);

	drm_mode_sort(&connector->modes);

	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,

			connector->name);

	list_for_each_entry(mode, &connector->modes, head) {

		drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);

		drm_mode_debug_printmodeline(mode);

	}

	return count;

}

EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);

/**

 * drm_kms_helper_hotplug_event - fire off KMS hotplug events

 * @dev: drm_device whose connector state changed

 *

 * This function fires off the uevent for userspace and also calls the

 * output_poll_changed function, which is most commonly used to inform the fbdev

 * emulation code and allow it to update the fbcon output configuration.

 *

 * Drivers should call this from their hotplug handling code when a change is

 * detected. Note that this function does not do any output detection of its

 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the

 * driver already.

 *

 * This function must be called from process context with no mode

 * setting locks held.

 */

void drm_kms_helper_hotplug_event(struct drm_device *dev)

{

	/* send a uevent + call fbdev */

	drm_sysfs_hotplug_event(dev);

	if (dev->mode_config.funcs->output_poll_changed)

		dev->mode_config.funcs->output_poll_changed(dev);

}

EXPORT_SYMBOL(drm_kms_helper_hotplug_event);

static void output_poll_execute(struct work_struct *work)

{

	struct delayed_work *delayed_work = to_delayed_work(work);

	struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);

	struct drm_connector *connector;

	enum drm_connector_status old_status;

	bool repoll = false, changed;

	/* Pick up any changes detected by the probe functions. */

	changed = dev->mode_config.delayed_event;

	dev->mode_config.delayed_event = false;

	if (!drm_kms_helper_poll)

		goto out;

	mutex_lock(&dev->mode_config.mutex);

	drm_for_each_connector(connector, dev) {

		/* Ignore forced connectors. */

		if (connector->force)

			continue;

		/* Ignore HPD capable connectors and connectors where we don't

		 * want any hotplug detection at all for polling. */

		if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)

			continue;

		old_status = connector->status;

		/* if we are connected and don't want to poll for disconnect

		   skip it */

		if (old_status == connector_status_connected &&

		    !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))

			continue;

		repoll = true;

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

		if (old_status != connector->status) {

			const char *old, *new;

			/*

			 * The poll work sets force=false when calling detect so

			 * that drivers can avoid to do disruptive tests (e.g.

			 * when load detect cycles could cause flickering on

			 * other, running displays). This bears the risk that we

			 * flip-flop between unknown here in the poll work and

			 * the real state when userspace forces a full detect

			 * call after receiving a hotplug event due to this

			 * change.

			 *

			 * Hence clamp an unknown detect status to the old

			 * value.

			 */

			if (connector->status == connector_status_unknown) {

				connector->status = old_status;

				continue;

			}

			old = drm_get_connector_status_name(old_status);

			new = drm_get_connector_status_name(connector->status);

			DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "

				      "status updated from %s to %s\n",

				      connector->base.id,

				      connector->name,

				      old, new);

			changed = true;

		}

	}

	mutex_unlock(&dev->mode_config.mutex);

out:

	if (changed)

		drm_kms_helper_hotplug_event(dev);

	if (repoll)

		schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);

}

/**

 * drm_kms_helper_poll_disable - disable output polling

 * @dev: drm_device

 *

 * This function disables the output polling work.

 *

 * Drivers can call this helper from their device suspend implementation. It is

 * not an error to call this even when output polling isn't enabled or arlready

 * disabled.

 */

void drm_kms_helper_poll_disable(struct drm_device *dev)

{

	if (!dev->mode_config.poll_enabled)

		return;

	cancel_delayed_work_sync(&dev->mode_config.output_poll_work);

}

EXPORT_SYMBOL(drm_kms_helper_poll_disable);

/**

 * drm_kms_helper_poll_enable - re-enable output polling.

 * @dev: drm_device

 *

 * This function re-enables the output polling work.

 *

 * Drivers can call this helper from their device resume implementation. It is

 * an error to call this when the output polling support has not yet been set

 * up.

 */

void drm_kms_helper_poll_enable(struct drm_device *dev)

{

	mutex_lock(&dev->mode_config.mutex);

	drm_kms_helper_poll_enable_locked(dev);

	mutex_unlock(&dev->mode_config.mutex);

}

EXPORT_SYMBOL(drm_kms_helper_poll_enable);

/**

 * drm_kms_helper_poll_init - initialize and enable output polling

 * @dev: drm_device

 *

 * This function intializes and then also enables output polling support for

 * @dev. Drivers which do not have reliable hotplug support in hardware can use

 * this helper infrastructure to regularly poll such connectors for changes in

 * their connection state.

 *

 * Drivers can control which connectors are polled by setting the

 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On

 * connectors where probing live outputs can result in visual distortion drivers

 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.

 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are

 * completely ignored by the polling logic.

 *

 * Note that a connector can be both polled and probed from the hotplug handler,

 * in case the hotplug interrupt is known to be unreliable.

 */

void drm_kms_helper_poll_init(struct drm_device *dev)

{

	INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);

	dev->mode_config.poll_enabled = true;

	drm_kms_helper_poll_enable(dev);

}

EXPORT_SYMBOL(drm_kms_helper_poll_init);

/**

 * drm_kms_helper_poll_fini - disable output polling and clean it up

 * @dev: drm_device

 */

void drm_kms_helper_poll_fini(struct drm_device *dev)

{

	drm_kms_helper_poll_disable(dev);

}

EXPORT_SYMBOL(drm_kms_helper_poll_fini);

/**

 * drm_helper_hpd_irq_event - hotplug processing

 * @dev: drm_device

 *

 * Drivers can use this helper function to run a detect cycle on all connectors

 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All

 * other connectors are ignored, which is useful to avoid reprobing fixed

 * panels.

 *

 * This helper function is useful for drivers which can't or don't track hotplug

 * interrupts for each connector.

 *

 * Drivers which support hotplug interrupts for each connector individually and

 * which have a more fine-grained detect logic should bypass this code and

 * directly call drm_kms_helper_hotplug_event() in case the connector state

 * changed.

 *

 * This function must be called from process context with no mode

 * setting locks held.

 *

 * Note that a connector can be both polled and probed from the hotplug handler,

 * in case the hotplug interrupt is known to be unreliable.

 */

bool drm_helper_hpd_irq_event(struct drm_device *dev)

{

	struct drm_connector *connector;

	enum drm_connector_status old_status;

	bool changed = false;

	if (!dev->mode_config.poll_enabled)

		return false;

	mutex_lock(&dev->mode_config.mutex);

	drm_for_each_connector(connector, dev) {

		/* Only handle HPD capable connectors. */

		if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))

			continue;

		old_status = connector->status;

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

		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",

			      connector->base.id,

			      connector->name,

			      drm_get_connector_status_name(old_status),

			      drm_get_connector_status_name(connector->status));

		if (old_status != connector->status)

			changed = true;

	}

	mutex_unlock(&dev->mode_config.mutex);

	if (changed)

		drm_kms_helper_hotplug_event(dev);

	return changed;

}

EXPORT_SYMBOL(drm_helper_hpd_irq_event);