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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 

#include 

#include 

#include 

#include 

/**

 * DOC: overview

 *

 * The CRTC modeset helper library provides a default set_config implementation

 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using

 * the same callbacks which drivers can use to e.g. restore the modeset

 * configuration on resume with drm_helper_resume_force_mode().

 *

 * Note that this helper library doesn't track the current power state of CRTCs

 * and encoders. It can call callbacks like ->dpms() even though the hardware is

 * already in the desired state. This deficiency has been fixed in the atomic

 * helpers.

 *

 * The driver callbacks are mostly compatible with the atomic modeset helpers,

 * except for the handling of the primary plane: Atomic helpers require that the

 * primary plane is implemented as a real standalone plane and not directly tied

 * to the CRTC state. For easier transition this library provides functions to

 * implement the old semantics required by the CRTC helpers using the new plane

 * and atomic helper callbacks.

 *

 * Drivers are strongly urged to convert to the atomic helpers (by way of first

 * converting to the plane helpers). New drivers must not use these functions

 * but need to implement the atomic interface instead, potentially using the

 * atomic helpers for that.

 *

 * These legacy modeset helpers use the same function table structures as

 * all other modesetting helpers. See the documentation for struct

 * &drm_crtc_helper_funcs, struct &drm_encoder_helper_funcs and struct

 * &drm_connector_helper_funcs.

 */

/**

 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the

 * 						connector list

 * @dev: drm device to operate on

 *

 * Some userspace presumes that the first connected connector is the main

 * display, where it's supposed to display e.g. the login screen. For

 * laptops, this should be the main panel. Use this function to sort all

 * (eDP/LVDS) panels to the front of the connector list, instead of

 * painstakingly trying to initialize them in the right order.

 */

void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)

{

	struct drm_connector *connector, *tmp;

	struct list_head panel_list;

	INIT_LIST_HEAD(&panel_list);

	list_for_each_entry_safe(connector, tmp,

				 &dev->mode_config.connector_list, head) {

		if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||

		    connector->connector_type == DRM_MODE_CONNECTOR_eDP)

			list_move_tail(&connector->head, &panel_list);

	}

	list_splice(&panel_list, &dev->mode_config.connector_list);

}

EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);

/**

 * drm_helper_encoder_in_use - check if a given encoder is in use

 * @encoder: encoder to check

 *

 * Checks whether @encoder is with the current mode setting output configuration

 * in use by any connector. This doesn't mean that it is actually enabled since

 * the DPMS state is tracked separately.

 *

 * Returns:

 * True if @encoder is used, false otherwise.

 */

bool drm_helper_encoder_in_use(struct drm_encoder *encoder)

{

	struct drm_connector *connector;

	struct drm_device *dev = encoder->dev;

	/*

	 * We can expect this mutex to be locked if we are not panicking.

	 * Locking is currently fubar in the panic handler.

	 */

	if (!oops_in_progress) {

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

		WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));

	}

	drm_for_each_connector(connector, dev)

		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

 *

 * Checks whether @crtc is with the current mode setting output configuration

 * in use by any connector. This doesn't mean that it is actually enabled since

 * the DPMS state is tracked separately.

 *

 * Returns:

 * True if @crtc is used, false otherwise.

 */

bool drm_helper_crtc_in_use(struct drm_crtc *crtc)

{

	struct drm_encoder *encoder;

	struct drm_device *dev = crtc->dev;

	/*

	 * We can expect this mutex to be locked if we are not panicking.

	 * Locking is currently fubar in the panic handler.

	 */

	if (!oops_in_progress)

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

	drm_for_each_encoder(encoder, dev)

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

			return true;

	return false;

}

EXPORT_SYMBOL(drm_helper_crtc_in_use);

static void

drm_encoder_disable(struct drm_encoder *encoder)

{

	const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;

	drm_bridge_disable(encoder->bridge);

	if (encoder_funcs->disable)

		(*encoder_funcs->disable)(encoder);

	else

		(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);

	drm_bridge_post_disable(encoder->bridge);

}

static void __drm_helper_disable_unused_functions(struct drm_device *dev)

{

	struct drm_encoder *encoder;

	struct drm_crtc *crtc;

	drm_warn_on_modeset_not_all_locked(dev);

	drm_for_each_encoder(encoder, dev) {

		if (!drm_helper_encoder_in_use(encoder)) {

			drm_encoder_disable(encoder);

			/* disconnect encoder from any connector */

			encoder->crtc = NULL;

		}

	}

	drm_for_each_crtc(crtc, dev) {

		const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;

		crtc->enabled = drm_helper_crtc_in_use(crtc);

		if (!crtc->enabled) {

			if (crtc_funcs->disable)

				(*crtc_funcs->disable)(crtc);

			else

				(*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);

			crtc->primary->fb = NULL;

		}

	}

}

/**

 * drm_helper_disable_unused_functions - disable unused objects

 * @dev: DRM device

 *

 * This function walks through the entire mode setting configuration of @dev. It

 * will remove any CRTC links of unused encoders and encoder links of

 * disconnected connectors. Then it will disable all unused encoders and CRTCs

 * either by calling their disable callback if available or by calling their

 * dpms callback with DRM_MODE_DPMS_OFF.

 *

 * NOTE:

 *

 * This function is part of the legacy modeset helper library and will cause

 * major confusion with atomic drivers. This is because atomic helpers guarantee

 * to never call ->disable() hooks on a disabled function, or ->enable() hooks

 * on an enabled functions. drm_helper_disable_unused_functions() on the other

 * hand throws such guarantees into the wind and calls disable hooks

 * unconditionally on unused functions.

 */

void drm_helper_disable_unused_functions(struct drm_device *dev)

{

	drm_modeset_lock_all(dev);

	__drm_helper_disable_unused_functions(dev);

	drm_modeset_unlock_all(dev);

}

EXPORT_SYMBOL(drm_helper_disable_unused_functions);

/*

 * Check the CRTC we're going to map each output to vs. its current

 * CRTC.  If they don't match, we have to disable the output and the CRTC

 * since the driver will have to re-route things.

 */

static void

drm_crtc_prepare_encoders(struct drm_device *dev)

{

	const struct drm_encoder_helper_funcs *encoder_funcs;

	struct drm_encoder *encoder;

	drm_for_each_encoder(encoder, dev) {

		encoder_funcs = encoder->helper_private;

		/* Disable unused encoders */

		if (encoder->crtc == NULL)

			drm_encoder_disable(encoder);

		/* Disable encoders whose CRTC is about to change */

		if (encoder_funcs->get_crtc &&

		    encoder->crtc != (*encoder_funcs->get_crtc)(encoder))

			drm_encoder_disable(encoder);

	}

}

/**

 * drm_crtc_helper_set_mode - internal helper to set a mode

 * @crtc: CRTC to program

 * @mode: mode to use

 * @x: horizontal offset into the surface

 * @y: vertical offset into the surface

 * @old_fb: old framebuffer, for cleanup

 *

 * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance

 * to fixup or reject the mode prior to trying to set it. This is an internal

 * helper that drivers could e.g. use to update properties that require the

 * entire output pipe to be disabled and re-enabled in a new configuration. For

 * example for changing whether audio is enabled on a hdmi link or for changing

 * panel fitter or dither attributes. It is also called by the

 * drm_crtc_helper_set_config() helper function to drive the mode setting

 * sequence.

 *

 * Returns:

 * True if the mode was set successfully, false otherwise.

 */

bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,

			      struct drm_display_mode *mode,

			      int x, int y,

			      struct drm_framebuffer *old_fb)

{

	struct drm_device *dev = crtc->dev;

	struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;

	const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;

	const struct drm_encoder_helper_funcs *encoder_funcs;

	int saved_x, saved_y;

	bool saved_enabled;

	struct drm_encoder *encoder;

	bool ret = true;

	drm_warn_on_modeset_not_all_locked(dev);

	saved_enabled = crtc->enabled;

	crtc->enabled = drm_helper_crtc_in_use(crtc);

	if (!crtc->enabled)

		return true;

	adjusted_mode = drm_mode_duplicate(dev, mode);

	if (!adjusted_mode) {

		crtc->enabled = saved_enabled;

		return false;

	}

	saved_mode = crtc->mode;

	saved_hwmode = crtc->hwmode;

	saved_x = crtc->x;

	saved_y = crtc->y;

	/* Update crtc values up front so the driver can rely on them for mode

	 * setting.

	 */

	crtc->mode = *mode;

	crtc->x = x;

	crtc->y = y;

	/* Pass our mode to the connectors and the CRTC to give them a chance to

	 * adjust it according to limitations or connector properties, and also

	 * a chance to reject the mode entirely.

	 */

	drm_for_each_encoder(encoder, dev) {

		if (encoder->crtc != crtc)

			continue;

		ret = drm_bridge_mode_fixup(encoder->bridge,

			mode, adjusted_mode);

		if (!ret) {

			DRM_DEBUG_KMS("Bridge fixup failed\n");

			goto done;

		}

		encoder_funcs = encoder->helper_private;

		if (encoder_funcs->mode_fixup) {

			if (!(ret = encoder_funcs->mode_fixup(encoder, mode,

							      adjusted_mode))) {

				DRM_DEBUG_KMS("Encoder fixup failed\n");

				goto done;

			}

		}

	}

	if (crtc_funcs->mode_fixup) {

		if (!(ret = crtc_funcs->mode_fixup(crtc, mode,

						adjusted_mode))) {

			DRM_DEBUG_KMS("CRTC fixup failed\n");

			goto done;

		}

	}

	DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);

	crtc->hwmode = *adjusted_mode;

	/* Prepare the encoders and CRTCs before setting the mode. */

	drm_for_each_encoder(encoder, dev) {

		if (encoder->crtc != crtc)

			continue;

		drm_bridge_disable(encoder->bridge);

		encoder_funcs = encoder->helper_private;

		/* Disable the encoders as the first thing we do. */

		encoder_funcs->prepare(encoder);

		drm_bridge_post_disable(encoder->bridge);

	}

	drm_crtc_prepare_encoders(dev);

	crtc_funcs->prepare(crtc);

	/* Set up the DPLL and any encoders state that needs to adjust or depend

	 * on the DPLL.

	 */

	ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);

	if (!ret)

	    goto done;

	drm_for_each_encoder(encoder, dev) {

		if (encoder->crtc != crtc)

			continue;

		DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",

			encoder->base.id, encoder->name,

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

		encoder_funcs = encoder->helper_private;

		encoder_funcs->mode_set(encoder, mode, adjusted_mode);

		drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);

	}

	/* Now enable the clocks, plane, pipe, and connectors that we set up. */

	crtc_funcs->commit(crtc);

	drm_for_each_encoder(encoder, dev) {

		if (encoder->crtc != crtc)

			continue;

		drm_bridge_pre_enable(encoder->bridge);

		encoder_funcs = encoder->helper_private;

		encoder_funcs->commit(encoder);

		drm_bridge_enable(encoder->bridge);

	}

	/* Calculate and store various constants which

	 * are later needed by vblank and swap-completion

	 * timestamping. They are derived from true hwmode.

	 */

	drm_calc_timestamping_constants(crtc, &crtc->hwmode);

	/* FIXME: add subpixel order */

done:

	drm_mode_destroy(dev, adjusted_mode);

	if (!ret) {

		crtc->enabled = saved_enabled;

		crtc->mode = saved_mode;

		crtc->hwmode = saved_hwmode;

		crtc->x = saved_x;

		crtc->y = saved_y;

	}

	return ret;

}

EXPORT_SYMBOL(drm_crtc_helper_set_mode);

static void

drm_crtc_helper_disable(struct drm_crtc *crtc)

{

	struct drm_device *dev = crtc->dev;

	struct drm_connector *connector;

	struct drm_encoder *encoder;

	/* Decouple all encoders and their attached connectors from this crtc */

	drm_for_each_encoder(encoder, dev) {

		if (encoder->crtc != crtc)

			continue;

		drm_for_each_connector(connector, dev) {

			if (connector->encoder != encoder)

				continue;

			connector->encoder = NULL;

			/*

			 * drm_helper_disable_unused_functions() ought to be

			 * doing this, but since we've decoupled the encoder

			 * from the connector above, the required connection

			 * between them is henceforth no longer available.

			 */

			connector->dpms = DRM_MODE_DPMS_OFF;

		}

	}

	__drm_helper_disable_unused_functions(dev);

}

/**

 * drm_crtc_helper_set_config - set a new config from userspace

 * @set: mode set configuration

 *

 * The drm_crtc_helper_set_config() helper function implements the set_config

 * callback of struct &drm_crtc_funcs for drivers using the legacy CRTC helpers.

 *

 * It first tries to locate the best encoder for each connector by calling the

 * connector ->best_encoder() (struct &drm_connector_helper_funcs) helper

 * operation.

 *

 * After locating the appropriate encoders, the helper function will call the

 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,

 * or reject it completely in which case an error will be returned to the

 * application. If the new configuration after mode adjustment is identical to

 * the current configuration the helper function will return without performing

 * any other operation.

 *

 * If the adjusted mode is identical to the current mode but changes to the

 * frame buffer need to be applied, the drm_crtc_helper_set_config() function

 * will call the CRTC ->mode_set_base() (struct &drm_crtc_helper_funcs) helper

 * operation.

 *

 * If the adjusted mode differs from the current mode, or if the

 * ->mode_set_base() helper operation is not provided, the helper function

 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()

 * and ->commit() CRTC and encoder helper operations, in that order.

 * Alternatively it can also use the dpms and disable helper operations. For

 * details see struct &drm_crtc_helper_funcs and struct

 * &drm_encoder_helper_funcs.

 *

 * This function is deprecated.  New drivers must implement atomic modeset

 * support, for which this function is unsuitable. Instead drivers should use

 * drm_atomic_helper_set_config().

 *

 * Returns:

 * Returns 0 on success, negative errno numbers on failure.

 */

int drm_crtc_helper_set_config(struct drm_mode_set *set)

{

	struct drm_device *dev;

	struct drm_crtc *new_crtc;

	struct drm_encoder *save_encoders, *new_encoder, *encoder;

	bool mode_changed = false; /* if true do a full mode set */

	bool fb_changed = false; /* if true and !mode_changed just do a flip */

	struct drm_connector *save_connectors, *connector;

	int count = 0, ro, fail = 0;

	const struct drm_crtc_helper_funcs *crtc_funcs;

	struct drm_mode_set save_set;

	int ret;

	int i;

	DRM_DEBUG_KMS("\n");

	BUG_ON(!set);

	BUG_ON(!set->crtc);

	BUG_ON(!set->crtc->helper_private);

	/* Enforce sane interface api - has been abused by the fb helper. */

	BUG_ON(!set->mode && set->fb);

	BUG_ON(set->fb && set->num_connectors == 0);

	crtc_funcs = set->crtc->helper_private;

	if (!set->mode)

		set->fb = NULL;

	if (set->fb) {

		DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",

			      set->crtc->base.id, set->crtc->name,

			      set->fb->base.id,

			      (int)set->num_connectors, set->x, set->y);

	} else {

		DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",

			      set->crtc->base.id, set->crtc->name);

		drm_crtc_helper_disable(set->crtc);

		return 0;

	}

	dev = set->crtc->dev;

	drm_warn_on_modeset_not_all_locked(dev);

	/*

	 * Allocate space for the backup of all (non-pointer) encoder and

	 * connector data.

	 */

	save_encoders = kzalloc(dev->mode_config.num_encoder *

				sizeof(struct drm_encoder), GFP_KERNEL);

	if (!save_encoders)

		return -ENOMEM;

	save_connectors = kzalloc(dev->mode_config.num_connector *

				sizeof(struct drm_connector), GFP_KERNEL);

	if (!save_connectors) {

		kfree(save_encoders);

		return -ENOMEM;

	}

	/*

	 * Copy data. Note that driver private data is not affected.

	 * Should anything bad happen only the expected state is

	 * restored, not the drivers personal bookkeeping.

	 */

	count = 0;

	drm_for_each_encoder(encoder, dev) {

		save_encoders[count++] = *encoder;

	}

	count = 0;

	drm_for_each_connector(connector, dev) {

		save_connectors[count++] = *connector;

	}

	save_set.crtc = set->crtc;

	save_set.mode = &set->crtc->mode;

	save_set.x = set->crtc->x;

	save_set.y = set->crtc->y;

	save_set.fb = set->crtc->primary->fb;

	/* We should be able to check here if the fb has the same properties

	 * and then just flip_or_move it */

	if (set->crtc->primary->fb != set->fb) {

		/* If we have no fb then treat it as a full mode set */

		if (set->crtc->primary->fb == NULL) {

			DRM_DEBUG_KMS("crtc has no fb, full mode set\n");

			mode_changed = true;

		} else if (set->fb->pixel_format !=

			   set->crtc->primary->fb->pixel_format) {

			mode_changed = true;

		} else

			fb_changed = true;

	}

	if (set->x != set->crtc->x || set->y != set->crtc->y)

		fb_changed = true;

	if (!drm_mode_equal(set->mode, &set->crtc->mode)) {

		DRM_DEBUG_KMS("modes are different, full mode set\n");

		drm_mode_debug_printmodeline(&set->crtc->mode);

		drm_mode_debug_printmodeline(set->mode);

		mode_changed = true;

	}

	/* a) traverse passed in connector list and get encoders for them */

	count = 0;

	drm_for_each_connector(connector, dev) {

		const struct drm_connector_helper_funcs *connector_funcs =

			connector->helper_private;

		new_encoder = connector->encoder;

		for (ro = 0; ro < set->num_connectors; ro++) {

			if (set->connectors[ro] == connector) {

				new_encoder = connector_funcs->best_encoder(connector);

				/* if we can't get an encoder for a connector

				   we are setting now - then fail */

				if (new_encoder == NULL)

					/* don't break so fail path works correct */

					fail = 1;

				if (connector->dpms != DRM_MODE_DPMS_ON) {

					DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");

					mode_changed = true;

				}

				break;

			}

		}

		if (new_encoder != connector->encoder) {

			DRM_DEBUG_KMS("encoder changed, full mode switch\n");

			mode_changed = true;

			/* If the encoder is reused for another connector, then

			 * the appropriate crtc will be set later.

			 */

			if (connector->encoder)

				connector->encoder->crtc = NULL;

			connector->encoder = new_encoder;

		}

	}

	if (fail) {

		ret = -EINVAL;

		goto fail;

	}

	count = 0;

	drm_for_each_connector(connector, dev) {

		if (!connector->encoder)

			continue;

		if (connector->encoder->crtc == set->crtc)

			new_crtc = NULL;

		else

			new_crtc = connector->encoder->crtc;

		for (ro = 0; ro < set->num_connectors; ro++) {

			if (set->connectors[ro] == connector)

				new_crtc = set->crtc;

		}

		/* Make sure the new CRTC will work with the encoder */

		if (new_crtc &&

		    !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {

			ret = -EINVAL;

			goto fail;

		}

		if (new_crtc != connector->encoder->crtc) {

			DRM_DEBUG_KMS("crtc changed, full mode switch\n");

			mode_changed = true;

			connector->encoder->crtc = new_crtc;

		}

		if (new_crtc) {

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

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

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

		} else {

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

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

		}

	}

	/* mode_set_base is not a required function */

	if (fb_changed && !crtc_funcs->mode_set_base)

		mode_changed = true;

	if (mode_changed) {

		if (drm_helper_crtc_in_use(set->crtc)) {

			DRM_DEBUG_KMS("attempting to set mode from"

					" userspace\n");

			drm_mode_debug_printmodeline(set->mode);

			set->crtc->primary->fb = set->fb;

			if (!drm_crtc_helper_set_mode(set->crtc, set->mode,

						      set->x, set->y,

						      save_set.fb)) {

				DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",

					  set->crtc->base.id, set->crtc->name);

				set->crtc->primary->fb = save_set.fb;

				ret = -EINVAL;

				goto fail;

			}

			DRM_DEBUG_KMS("Setting connector DPMS state to on\n");

			for (i = 0; i < set->num_connectors; i++) {

				DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,

					      set->connectors[i]->name);

				set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);

			}

		}

		__drm_helper_disable_unused_functions(dev);

	} else if (fb_changed) {

		set->crtc->x = set->x;

		set->crtc->y = set->y;

		set->crtc->primary->fb = set->fb;

		ret = crtc_funcs->mode_set_base(set->crtc,

						set->x, set->y, save_set.fb);

		if (ret != 0) {

			set->crtc->x = save_set.x;

			set->crtc->y = save_set.y;

			set->crtc->primary->fb = save_set.fb;

			goto fail;

		}

	}

	kfree(save_connectors);

	kfree(save_encoders);

	return 0;

fail:

	/* Restore all previous data. */

	count = 0;

	drm_for_each_encoder(encoder, dev) {

		*encoder = save_encoders[count++];

	}

	count = 0;

	drm_for_each_connector(connector, dev) {

		*connector = save_connectors[count++];

	}

	/* Try to restore the config */

	if (mode_changed &&

	    !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,

				      save_set.y, save_set.fb))

		DRM_ERROR("failed to restore config after modeset failure\n");

	kfree(save_connectors);

	kfree(save_encoders);

	return ret;

}

EXPORT_SYMBOL(drm_crtc_helper_set_config);

static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)

{

	int dpms = DRM_MODE_DPMS_OFF;

	struct drm_connector *connector;

	struct drm_device *dev = encoder->dev;

	drm_for_each_connector(connector, dev)

		if (connector->encoder == encoder)

			if (connector->dpms < dpms)

				dpms = connector->dpms;

	return dpms;

}

/* Helper which handles bridge ordering around encoder dpms */

static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)

{

	struct drm_bridge *bridge = encoder->bridge;

	const struct drm_encoder_helper_funcs *encoder_funcs;

	if (mode == DRM_MODE_DPMS_ON)

		drm_bridge_pre_enable(bridge);

	else

		drm_bridge_disable(bridge);

	encoder_funcs = encoder->helper_private;

	if (encoder_funcs->dpms)

		encoder_funcs->dpms(encoder, mode);

	if (mode == DRM_MODE_DPMS_ON)

		drm_bridge_enable(bridge);

	else

		drm_bridge_post_disable(bridge);

}

static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)

{

	int dpms = DRM_MODE_DPMS_OFF;

	struct drm_connector *connector;

	struct drm_device *dev = crtc->dev;

	drm_for_each_connector(connector, dev)

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

			if (connector->dpms < dpms)

				dpms = connector->dpms;

	return dpms;

}

/**

 * drm_helper_connector_dpms() - connector dpms helper implementation

 * @connector: affected connector

 * @mode: DPMS mode

 *

 * The drm_helper_connector_dpms() helper function implements the ->dpms()

 * callback of struct &drm_connector_funcs for drivers using the legacy CRTC helpers.

 *

 * This is the main helper function provided by the CRTC helper framework for

 * implementing the DPMS connector attribute. It computes the new desired DPMS

 * state for all encoders and CRTCs in the output mesh and calls the ->dpms()

 * callbacks provided by the driver in struct &drm_crtc_helper_funcs and struct

 * &drm_encoder_helper_funcs appropriately.

 *

 * This function is deprecated.  New drivers must implement atomic modeset

 * support, for which this function is unsuitable. Instead drivers should use

 * drm_atomic_helper_connector_dpms().

 *

 * Returns:

 * Always returns 0.

 */

int drm_helper_connector_dpms(struct drm_connector *connector, int mode)

{

	struct drm_encoder *encoder = connector->encoder;

	struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;

	int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;

	if (mode == connector->dpms)

		return 0;

	old_dpms = connector->dpms;

	connector->dpms = mode;

	if (encoder)

		encoder_dpms = drm_helper_choose_encoder_dpms(encoder);

	/* from off to on, do crtc then encoder */

	if (mode < old_dpms) {

		if (crtc) {

			const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;

			if (crtc_funcs->dpms)

				(*crtc_funcs->dpms) (crtc,

						     drm_helper_choose_crtc_dpms(crtc));

		}

		if (encoder)

			drm_helper_encoder_dpms(encoder, encoder_dpms);

	}

	/* from on to off, do encoder then crtc */

	if (mode > old_dpms) {

		if (encoder)

			drm_helper_encoder_dpms(encoder, encoder_dpms);

		if (crtc) {

			const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;

			if (crtc_funcs->dpms)

				(*crtc_funcs->dpms) (crtc,

						     drm_helper_choose_crtc_dpms(crtc));

		}

	}

	return 0;

}

EXPORT_SYMBOL(drm_helper_connector_dpms);

/**

 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata

 * @fb: drm_framebuffer object to fill out

 * @mode_cmd: metadata from the userspace fb creation request

 *

 * This helper can be used in a drivers fb_create callback to pre-fill the fb's

 * metadata fields.

 */

void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,

				    const struct drm_mode_fb_cmd2 *mode_cmd)

{

	int i;

	fb->width = mode_cmd->width;

	fb->height = mode_cmd->height;

	for (i = 0; i < 4; i++) {

		fb->pitches[i] = mode_cmd->pitches[i];

		fb->offsets[i] = mode_cmd->offsets[i];

		fb->modifier[i] = mode_cmd->modifier[i];

	}

	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,

				    &fb->bits_per_pixel);

	fb->pixel_format = mode_cmd->pixel_format;

	fb->flags = mode_cmd->flags;

}

EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);

/**

 * drm_helper_resume_force_mode - force-restore mode setting configuration

 * @dev: drm_device which should be restored

 *

 * Drivers which use the mode setting helpers can use this function to

 * force-restore the mode setting configuration e.g. on resume or when something

 * else might have trampled over the hw state (like some overzealous old BIOSen

 * tended to do).

 *

 * This helper doesn't provide a error return value since restoring the old

 * config should never fail due to resource allocation issues since the driver

 * has successfully set the restored configuration already. Hence this should

 * boil down to the equivalent of a few dpms on calls, which also don't provide

 * an error code.

 *

 * Drivers where simply restoring an old configuration again might fail (e.g.

 * due to slight differences in allocating shared resources when the

 * configuration is restored in a different order than when userspace set it up)

 * need to use their own restore logic.

 *

 * This function is deprecated. New drivers should implement atomic mode-

 * setting and use the atomic suspend/resume helpers.

 *

 * See also:

 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()

 */

void drm_helper_resume_force_mode(struct drm_device *dev)

{

	struct drm_crtc *crtc;

	struct drm_encoder *encoder;

	const struct drm_crtc_helper_funcs *crtc_funcs;

	int encoder_dpms;

	bool ret;

	drm_modeset_lock_all(dev);

	drm_for_each_crtc(crtc, dev) {

		if (!crtc->enabled)

			continue;

		ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,

					       crtc->x, crtc->y, crtc->primary->fb);

		/* Restoring the old config should never fail! */

		if (ret == false)

			DRM_ERROR("failed to set mode on crtc %p\n", crtc);

		/* Turn off outputs that were already powered off */

		if (drm_helper_choose_crtc_dpms(crtc)) {

			drm_for_each_encoder(encoder, dev) {

				if(encoder->crtc != crtc)

					continue;

				encoder_dpms = drm_helper_choose_encoder_dpms(

							encoder);

				drm_helper_encoder_dpms(encoder, encoder_dpms);

			}

			crtc_funcs = crtc->helper_private;

			if (crtc_funcs->dpms)

				(*crtc_funcs->dpms) (crtc,

						     drm_helper_choose_crtc_dpms(crtc));

		}

	}

	/* disable the unused connectors while restoring the modesetting */

	__drm_helper_disable_unused_functions(dev);

	drm_modeset_unlock_all(dev);

}

EXPORT_SYMBOL(drm_helper_resume_force_mode);

/**

 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers

 * @crtc: DRM CRTC

 * @mode: DRM display mode which userspace requested

 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks

 * @x: x offset of the CRTC scanout area on the underlying framebuffer

 * @y: y offset of the CRTC scanout area on the underlying framebuffer

 * @old_fb: previous framebuffer

 *

 * This function implements a callback useable as the ->mode_set callback

 * required by the CRTC helpers. Besides the atomic plane helper functions for

 * the primary plane the driver must also provide the ->mode_set_nofb callback

 * to set up the CRTC.

 *

 * This is a transitional helper useful for converting drivers to the atomic

 * interfaces.

 */

int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,

			     struct drm_display_mode *adjusted_mode, int x, int y,

			     struct drm_framebuffer *old_fb)

{

	struct drm_crtc_state *crtc_state;

	const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;

	int ret;

	if (crtc->funcs->atomic_duplicate_state)

		crtc_state = crtc->funcs->atomic_duplicate_state(crtc);

	else {

		if (!crtc->state)

			drm_atomic_helper_crtc_reset(crtc);

		crtc_state = drm_atomic_helper_crtc_duplicate_state(crtc);

	}

	if (!crtc_state)

		return -ENOMEM;

	crtc_state->planes_changed = true;

	crtc_state->mode_changed = true;

	ret = drm_atomic_set_mode_for_crtc(crtc_state, mode);

	if (ret)

		goto out;

	drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode);

	if (crtc_funcs->atomic_check) {

		ret = crtc_funcs->atomic_check(crtc, crtc_state);

		if (ret)

			goto out;

	}

	swap(crtc->state, crtc_state);

	crtc_funcs->mode_set_nofb(crtc);

	ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb);

out:

	if (crtc_state) {

		if (crtc->funcs->atomic_destroy_state)

			crtc->funcs->atomic_destroy_state(crtc, crtc_state);

		else

			drm_atomic_helper_crtc_destroy_state(crtc, crtc_state);

	}

	return ret;

}

EXPORT_SYMBOL(drm_helper_crtc_mode_set);

/**

 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers

 * @crtc: DRM CRTC

 * @x: x offset of the CRTC scanout area on the underlying framebuffer

 * @y: y offset of the CRTC scanout area on the underlying framebuffer

 * @old_fb: previous framebuffer

 *

 * This function implements a callback useable as the ->mode_set_base used

 * required by the CRTC helpers. The driver must provide the atomic plane helper

 * functions for the primary plane.

 *

 * This is a transitional helper useful for converting drivers to the atomic

 * interfaces.

 */

int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,

				  struct drm_framebuffer *old_fb)

{

	struct drm_plane_state *plane_state;

	struct drm_plane *plane = crtc->primary;

	if (plane->funcs->atomic_duplicate_state)

		plane_state = plane->funcs->atomic_duplicate_state(plane);

	else if (plane->state)

		plane_state = drm_atomic_helper_plane_duplicate_state(plane);

	else

		plane_state = kzalloc(sizeof(*plane_state), GFP_KERNEL);

	if (!plane_state)

		return -ENOMEM;

	plane_state->plane = plane;

	plane_state->crtc = crtc;

	drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb);

	plane_state->crtc_x = 0;

	plane_state->crtc_y = 0;

	plane_state->crtc_h = crtc->mode.vdisplay;

	plane_state->crtc_w = crtc->mode.hdisplay;

	plane_state->src_x = x << 16;

	plane_state->src_y = y << 16;

	plane_state->src_h = crtc->mode.vdisplay << 16;

	plane_state->src_w = crtc->mode.hdisplay << 16;