drivers/gpu/drm/exynos/exynos_drm_encoder.c - kernel/msm-4.9 - Gitiles

 /* exynos_drm_encoder.c
  *
  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
  * Authors:
  *	Inki Dae <inki.dae@samsung.com>
  *	Joonyoung Shim <jy0922.shim@samsung.com>
  *	Seung-Woo Kim <sw0312.kim@samsung.com>
  *
  * 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
  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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.
  */

 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>

 #include "exynos_drm_drv.h"
 #include "exynos_drm_encoder.h"
 #include "exynos_drm_connector.h"

 #define to_exynos_encoder(x)	container_of(x, struct exynos_drm_encoder,\
 				drm_encoder)

 /*
  * exynos specific encoder structure.
  *
  * @drm_encoder: encoder object.
  * @manager: specific encoder has its own manager to control a hardware
  *	appropriately and we can access a hardware drawing on this manager.
  * @dpms: store the encoder dpms value.
  */
 struct exynos_drm_encoder {
 	struct drm_crtc			*old_crtc;
 	struct drm_encoder		drm_encoder;
 	struct exynos_drm_manager	*manager;
 	int dpms;
 };

 static void exynos_drm_connector_power(struct drm_encoder *encoder, int mode)
 {
 	struct drm_device *dev = encoder->dev;
 	struct drm_connector *connector;

 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		if (exynos_drm_best_encoder(connector) == encoder) {
 			DRM_DEBUG_KMS("connector[%d] dpms[%d]\n",
 					connector->base.id, mode);

 			exynos_drm_display_power(connector, mode);
 		}
 	}
 }

 static void exynos_drm_encoder_dpms(struct drm_encoder *encoder, int mode)
 {
 	struct drm_device *dev = encoder->dev;
 	struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
 	struct exynos_drm_manager_ops *manager_ops = manager->ops;
 	struct exynos_drm_encoder *exynos_encoder = to_exynos_encoder(encoder);

 	DRM_DEBUG_KMS("%s, encoder dpms: %d\n", __FILE__, mode);

 	if (exynos_encoder->dpms == mode) {
 		DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
 		return;
 	}

 	mutex_lock(&dev->struct_mutex);

 	switch (mode) {
 	case DRM_MODE_DPMS_ON:
 		if (manager_ops && manager_ops->apply)
 			manager_ops->apply(manager->dev);
 		exynos_drm_connector_power(encoder, mode);
 		exynos_encoder->dpms = mode;
 		break;
 	case DRM_MODE_DPMS_STANDBY:
 	case DRM_MODE_DPMS_SUSPEND:
 	case DRM_MODE_DPMS_OFF:
 		exynos_drm_connector_power(encoder, mode);
 		exynos_encoder->dpms = mode;
 		break;
 	default:
 		DRM_ERROR("unspecified mode %d\n", mode);
 		break;
 	}

 	mutex_unlock(&dev->struct_mutex);
 }

 static bool
 exynos_drm_encoder_mode_fixup(struct drm_encoder *encoder,
 			       const struct drm_display_mode *mode,
 			       struct drm_display_mode *adjusted_mode)
 {
 	struct drm_device *dev = encoder->dev;
 	struct drm_connector *connector;
 	struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
 	struct exynos_drm_manager_ops *manager_ops = manager->ops;

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		if (connector->encoder == encoder)
 			if (manager_ops && manager_ops->mode_fixup)
 				manager_ops->mode_fixup(manager->dev, connector,
 							mode, adjusted_mode);
 	}

 	return true;
 }

 static void disable_plane_to_crtc(struct drm_device *dev,
 						struct drm_crtc *old_crtc,
 						struct drm_crtc *new_crtc)
 {
 	struct drm_plane *plane;

 	/*
 	 * if old_crtc isn't same as encoder->crtc then it means that
 	 * user changed crtc id to another one so the plane to old_crtc
 	 * should be disabled and plane->crtc should be set to new_crtc
 	 * (encoder->crtc)
 	 */
 	list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
 		if (plane->crtc == old_crtc) {
 			/*
 			 * do not change below call order.
 			 *
 			 * plane->funcs->disable_plane call checks
 			 * if encoder->crtc is same as plane->crtc and if same
 			 * then overlay_ops->disable callback will be called
 			 * to diasble current hw overlay so plane->crtc should
 			 * have new_crtc because new_crtc was set to
 			 * encoder->crtc in advance.
 			 */
 			plane->crtc = new_crtc;
 			plane->funcs->disable_plane(plane);
 		}
 	}
 }

 static void exynos_drm_encoder_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_connector *connector;
 	struct exynos_drm_manager *manager;
 	struct exynos_drm_manager_ops *manager_ops;

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		if (connector->encoder == encoder) {
 			struct exynos_drm_encoder *exynos_encoder;

 			exynos_encoder = to_exynos_encoder(encoder);

 			if (exynos_encoder->old_crtc != encoder->crtc &&
 					exynos_encoder->old_crtc) {

 				/*
 				 * disable a plane to old crtc and change
 				 * crtc of the plane to new one.
 				 */
 				disable_plane_to_crtc(dev,
 						exynos_encoder->old_crtc,
 						encoder->crtc);
 			}

 			manager = exynos_drm_get_manager(encoder);
 			manager_ops = manager->ops;

 			if (manager_ops && manager_ops->mode_set)
 				manager_ops->mode_set(manager->dev,
 							adjusted_mode);

 			exynos_encoder->old_crtc = encoder->crtc;
 		}
 	}
 }

 static void exynos_drm_encoder_prepare(struct drm_encoder *encoder)
 {
 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	/* drm framework doesn't check NULL. */
 }

 static void exynos_drm_encoder_commit(struct drm_encoder *encoder)
 {
 	struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
 	struct exynos_drm_manager_ops *manager_ops = manager->ops;

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	if (manager_ops && manager_ops->commit)
 		manager_ops->commit(manager->dev);
 }

 static void exynos_drm_encoder_disable(struct drm_encoder *encoder)
 {
 	struct drm_plane *plane;
 	struct drm_device *dev = encoder->dev;

 	exynos_drm_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);

 	/* all planes connected to this encoder should be also disabled. */
 	list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
 		if (plane->crtc == encoder->crtc)
 			plane->funcs->disable_plane(plane);
 	}
 }

 static struct drm_encoder_helper_funcs exynos_encoder_helper_funcs = {
 	.dpms		= exynos_drm_encoder_dpms,
 	.mode_fixup	= exynos_drm_encoder_mode_fixup,
 	.mode_set	= exynos_drm_encoder_mode_set,
 	.prepare	= exynos_drm_encoder_prepare,
 	.commit		= exynos_drm_encoder_commit,
 	.disable	= exynos_drm_encoder_disable,
 };

 static void exynos_drm_encoder_destroy(struct drm_encoder *encoder)
 {
 	struct exynos_drm_encoder *exynos_encoder =
 		to_exynos_encoder(encoder);

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	exynos_encoder->manager->pipe = -1;

 	drm_encoder_cleanup(encoder);
 	kfree(exynos_encoder);
 }

 static struct drm_encoder_funcs exynos_encoder_funcs = {
 	.destroy = exynos_drm_encoder_destroy,
 };

 static unsigned int exynos_drm_encoder_clones(struct drm_encoder *encoder)
 {
 	struct drm_encoder *clone;
 	struct drm_device *dev = encoder->dev;
 	struct exynos_drm_encoder *exynos_encoder = to_exynos_encoder(encoder);
 	struct exynos_drm_display_ops *display_ops =
 				exynos_encoder->manager->display_ops;
 	unsigned int clone_mask = 0;
 	int cnt = 0;

 	list_for_each_entry(clone, &dev->mode_config.encoder_list, head) {
 		switch (display_ops->type) {
 		case EXYNOS_DISPLAY_TYPE_LCD:
 		case EXYNOS_DISPLAY_TYPE_HDMI:
 		case EXYNOS_DISPLAY_TYPE_VIDI:
 			clone_mask |= (1 << (cnt++));
 			break;
 		default:
 			continue;
 		}
 	}

 	return clone_mask;
 }

 void exynos_drm_encoder_setup(struct drm_device *dev)
 {
 	struct drm_encoder *encoder;

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 		encoder->possible_clones = exynos_drm_encoder_clones(encoder);
 }

 struct drm_encoder *
 exynos_drm_encoder_create(struct drm_device *dev,
 			   struct exynos_drm_manager *manager,
 			   unsigned int possible_crtcs)
 {
 	struct drm_encoder *encoder;
 	struct exynos_drm_encoder *exynos_encoder;

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	if (!manager || !possible_crtcs)
 		return NULL;

 	if (!manager->dev)
 		return NULL;

 	exynos_encoder = kzalloc(sizeof(*exynos_encoder), GFP_KERNEL);
 	if (!exynos_encoder) {
 		DRM_ERROR("failed to allocate encoder\n");
 		return NULL;
 	}

 	exynos_encoder->dpms = DRM_MODE_DPMS_OFF;
 	exynos_encoder->manager = manager;
 	encoder = &exynos_encoder->drm_encoder;
 	encoder->possible_crtcs = possible_crtcs;

 	DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);

 	drm_encoder_init(dev, encoder, &exynos_encoder_funcs,
 			DRM_MODE_ENCODER_TMDS);

 	drm_encoder_helper_add(encoder, &exynos_encoder_helper_funcs);

 	DRM_DEBUG_KMS("encoder has been created\n");

 	return encoder;
 }

 struct exynos_drm_manager *exynos_drm_get_manager(struct drm_encoder *encoder)
 {
 	return to_exynos_encoder(encoder)->manager;
 }

 void exynos_drm_fn_encoder(struct drm_crtc *crtc, void *data,
 			    void (*fn)(struct drm_encoder *, void *))
 {
 	struct drm_device *dev = crtc->dev;
 	struct drm_encoder *encoder;
 	struct exynos_drm_private *private = dev->dev_private;
 	struct exynos_drm_manager *manager;

 	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 		/*
 		 * if crtc is detached from encoder, check pipe,
 		 * otherwise check crtc attached to encoder
 		 */
 		if (!encoder->crtc) {
 			manager = to_exynos_encoder(encoder)->manager;
 			if (manager->pipe < 0 ||
 					private->crtc[manager->pipe] != crtc)
 				continue;
 		} else {
 			if (encoder->crtc != crtc)
 				continue;
 		}

 		fn(encoder, data);
 	}
 }

 void exynos_drm_enable_vblank(struct drm_encoder *encoder, void *data)
 {
 	struct exynos_drm_manager *manager =
 		to_exynos_encoder(encoder)->manager;
 	struct exynos_drm_manager_ops *manager_ops = manager->ops;
 	int crtc = *(int *)data;

 	if (manager->pipe != crtc)
 		return;

 	if (manager_ops->enable_vblank)
 		manager_ops->enable_vblank(manager->dev);
 }

 void exynos_drm_disable_vblank(struct drm_encoder *encoder, void *data)
 {
 	struct exynos_drm_manager *manager =
 		to_exynos_encoder(encoder)->manager;
 	struct exynos_drm_manager_ops *manager_ops = manager->ops;
 	int crtc = *(int *)data;

 	if (manager->pipe != crtc)
 		return;

 	if (manager_ops->disable_vblank)
 		manager_ops->disable_vblank(manager->dev);
 }

 void exynos_drm_encoder_crtc_dpms(struct drm_encoder *encoder, void *data)
 {
 	struct exynos_drm_encoder *exynos_encoder = to_exynos_encoder(encoder);
 	struct exynos_drm_manager *manager = exynos_encoder->manager;
 	struct exynos_drm_manager_ops *manager_ops = manager->ops;
 	int mode = *(int *)data;

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	if (manager_ops && manager_ops->dpms)
 		manager_ops->dpms(manager->dev, mode);

 	/*
 	 * set current mode to new one so that data aren't updated into
 	 * registers by drm_helper_connector_dpms two times.
 	 *
 	 * in case that drm_crtc_helper_set_mode() is called,
 	 * overlay_ops->commit() and manager_ops->commit() callbacks
 	 * can be called two times, first at drm_crtc_helper_set_mode()
 	 * and second at drm_helper_connector_dpms().
 	 * so with this setting, when drm_helper_connector_dpms() is called
 	 * encoder->funcs->dpms() will be ignored.
 	 */
 	exynos_encoder->dpms = mode;

 	/*
 	 * if this condition is ok then it means that the crtc is already
 	 * detached from encoder and last function for detaching is properly
 	 * done, so clear pipe from manager to prevent repeated call.
 	 */
 	if (mode > DRM_MODE_DPMS_ON) {
 		if (!encoder->crtc)
 			manager->pipe = -1;
 	}
 }

 void exynos_drm_encoder_crtc_pipe(struct drm_encoder *encoder, void *data)
 {
 	struct exynos_drm_manager *manager =
 		to_exynos_encoder(encoder)->manager;
 	int pipe = *(int *)data;

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	/*
 	 * when crtc is detached from encoder, this pipe is used
 	 * to select manager operation
 	 */
 	manager->pipe = pipe;
 }

 void exynos_drm_encoder_plane_mode_set(struct drm_encoder *encoder, void *data)
 {
 	struct exynos_drm_manager *manager =
 		to_exynos_encoder(encoder)->manager;
 	struct exynos_drm_overlay_ops *overlay_ops = manager->overlay_ops;
 	struct exynos_drm_overlay *overlay = data;

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	if (overlay_ops && overlay_ops->mode_set)
 		overlay_ops->mode_set(manager->dev, overlay);
 }

 void exynos_drm_encoder_plane_commit(struct drm_encoder *encoder, void *data)
 {
 	struct exynos_drm_manager *manager =
 		to_exynos_encoder(encoder)->manager;
 	struct exynos_drm_overlay_ops *overlay_ops = manager->overlay_ops;
 	int zpos = DEFAULT_ZPOS;

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	if (data)
 		zpos = *(int *)data;

 	if (overlay_ops && overlay_ops->commit)
 		overlay_ops->commit(manager->dev, zpos);
 }

 void exynos_drm_encoder_plane_enable(struct drm_encoder *encoder, void *data)
 {
 	struct exynos_drm_manager *manager =
 		to_exynos_encoder(encoder)->manager;
 	struct exynos_drm_overlay_ops *overlay_ops = manager->overlay_ops;
 	int zpos = DEFAULT_ZPOS;

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	if (data)
 		zpos = *(int *)data;

 	if (overlay_ops && overlay_ops->enable)
 		overlay_ops->enable(manager->dev, zpos);
 }

 void exynos_drm_encoder_plane_disable(struct drm_encoder *encoder, void *data)
 {
 	struct exynos_drm_manager *manager =
 		to_exynos_encoder(encoder)->manager;
 	struct exynos_drm_overlay_ops *overlay_ops = manager->overlay_ops;
 	int zpos = DEFAULT_ZPOS;

 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	if (data)
 		zpos = *(int *)data;

 	if (overlay_ops && overlay_ops->disable)
 		overlay_ops->disable(manager->dev, zpos);

 	/*
 	 * wait for vblank interrupt
 	 * - this makes sure that hardware overlay is disabled to avoid
 	 * for the dma accesses to memory after gem buffer was released
 	 * because the setting for disabling the overlay will be updated
 	 * at vsync.
 	 */
 	if (overlay_ops->wait_for_vblank)
 		overlay_ops->wait_for_vblank(manager->dev);
 }
	/* exynos_drm_encoder.c
	*
	* Copyright (c) 2011 Samsung Electronics Co., Ltd.
	* Authors:
	* Inki Dae <inki.dae@samsung.com>
	* Joonyoung Shim <jy0922.shim@samsung.com>
	* Seung-Woo Kim <sw0312.kim@samsung.com>
	*
	* 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
	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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.
	*/

	#include <drm/drmP.h>
	#include <drm/drm_crtc_helper.h>

	#include "exynos_drm_drv.h"
	#include "exynos_drm_encoder.h"
	#include "exynos_drm_connector.h"

	#define to_exynos_encoder(x) container_of(x, struct exynos_drm_encoder,\
	drm_encoder)

	/*
	* exynos specific encoder structure.
	*
	* @drm_encoder: encoder object.
	* @manager: specific encoder has its own manager to control a hardware
	* appropriately and we can access a hardware drawing on this manager.
	* @dpms: store the encoder dpms value.
	*/
	struct exynos_drm_encoder {
	struct drm_crtc *old_crtc;
	struct drm_encoder drm_encoder;
	struct exynos_drm_manager *manager;
	int dpms;
	};

	static void exynos_drm_connector_power(struct drm_encoder *encoder, int mode)
	{
	struct drm_device *dev = encoder->dev;
	struct drm_connector *connector;

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
	if (exynos_drm_best_encoder(connector) == encoder) {
	DRM_DEBUG_KMS("connector[%d] dpms[%d]\n",
	connector->base.id, mode);

	exynos_drm_display_power(connector, mode);
	}
	}
	}

	static void exynos_drm_encoder_dpms(struct drm_encoder *encoder, int mode)
	{
	struct drm_device *dev = encoder->dev;
	struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
	struct exynos_drm_manager_ops *manager_ops = manager->ops;
	struct exynos_drm_encoder *exynos_encoder = to_exynos_encoder(encoder);

	DRM_DEBUG_KMS("%s, encoder dpms: %d\n", __FILE__, mode);

	if (exynos_encoder->dpms == mode) {
	DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
	return;
	}

	mutex_lock(&dev->struct_mutex);

	switch (mode) {
	case DRM_MODE_DPMS_ON:
	if (manager_ops && manager_ops->apply)
	manager_ops->apply(manager->dev);
	exynos_drm_connector_power(encoder, mode);
	exynos_encoder->dpms = mode;
	break;
	case DRM_MODE_DPMS_STANDBY:
	case DRM_MODE_DPMS_SUSPEND:
	case DRM_MODE_DPMS_OFF:
	exynos_drm_connector_power(encoder, mode);
	exynos_encoder->dpms = mode;
	break;
	default:
	DRM_ERROR("unspecified mode %d\n", mode);
	break;
	}

	mutex_unlock(&dev->struct_mutex);
	}

	static bool
	exynos_drm_encoder_mode_fixup(struct drm_encoder *encoder,
	const struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{
	struct drm_device *dev = encoder->dev;
	struct drm_connector *connector;
	struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
	struct exynos_drm_manager_ops *manager_ops = manager->ops;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
	if (connector->encoder == encoder)
	if (manager_ops && manager_ops->mode_fixup)
	manager_ops->mode_fixup(manager->dev, connector,
	mode, adjusted_mode);
	}

	return true;
	}

	static void disable_plane_to_crtc(struct drm_device *dev,
	struct drm_crtc *old_crtc,
	struct drm_crtc *new_crtc)
	{
	struct drm_plane *plane;

	/*
	* if old_crtc isn't same as encoder->crtc then it means that
	* user changed crtc id to another one so the plane to old_crtc
	* should be disabled and plane->crtc should be set to new_crtc
	* (encoder->crtc)
	*/
	list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
	if (plane->crtc == old_crtc) {
	/*
	* do not change below call order.
	*
	* plane->funcs->disable_plane call checks
	* if encoder->crtc is same as plane->crtc and if same
	* then overlay_ops->disable callback will be called
	* to diasble current hw overlay so plane->crtc should
	* have new_crtc because new_crtc was set to
	* encoder->crtc in advance.
	*/
	plane->crtc = new_crtc;
	plane->funcs->disable_plane(plane);
	}
	}
	}

	static void exynos_drm_encoder_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_connector *connector;
	struct exynos_drm_manager *manager;
	struct exynos_drm_manager_ops *manager_ops;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
	if (connector->encoder == encoder) {
	struct exynos_drm_encoder *exynos_encoder;

	exynos_encoder = to_exynos_encoder(encoder);

	if (exynos_encoder->old_crtc != encoder->crtc &&
	exynos_encoder->old_crtc) {

	/*
	* disable a plane to old crtc and change
	* crtc of the plane to new one.
	*/
	disable_plane_to_crtc(dev,
	exynos_encoder->old_crtc,
	encoder->crtc);
	}

	manager = exynos_drm_get_manager(encoder);
	manager_ops = manager->ops;

	if (manager_ops && manager_ops->mode_set)
	manager_ops->mode_set(manager->dev,
	adjusted_mode);

	exynos_encoder->old_crtc = encoder->crtc;
	}
	}
	}

	static void exynos_drm_encoder_prepare(struct drm_encoder *encoder)
	{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	/* drm framework doesn't check NULL. */
	}

	static void exynos_drm_encoder_commit(struct drm_encoder *encoder)
	{
	struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
	struct exynos_drm_manager_ops *manager_ops = manager->ops;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (manager_ops && manager_ops->commit)
	manager_ops->commit(manager->dev);
	}

	static void exynos_drm_encoder_disable(struct drm_encoder *encoder)
	{
	struct drm_plane *plane;
	struct drm_device *dev = encoder->dev;

	exynos_drm_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);

	/* all planes connected to this encoder should be also disabled. */
	list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
	if (plane->crtc == encoder->crtc)
	plane->funcs->disable_plane(plane);
	}
	}

	static struct drm_encoder_helper_funcs exynos_encoder_helper_funcs = {
	.dpms = exynos_drm_encoder_dpms,
	.mode_fixup = exynos_drm_encoder_mode_fixup,
	.mode_set = exynos_drm_encoder_mode_set,
	.prepare = exynos_drm_encoder_prepare,
	.commit = exynos_drm_encoder_commit,
	.disable = exynos_drm_encoder_disable,
	};

	static void exynos_drm_encoder_destroy(struct drm_encoder *encoder)
	{
	struct exynos_drm_encoder *exynos_encoder =
	to_exynos_encoder(encoder);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	exynos_encoder->manager->pipe = -1;

	drm_encoder_cleanup(encoder);
	kfree(exynos_encoder);
	}

	static struct drm_encoder_funcs exynos_encoder_funcs = {
	.destroy = exynos_drm_encoder_destroy,
	};

	static unsigned int exynos_drm_encoder_clones(struct drm_encoder *encoder)
	{
	struct drm_encoder *clone;
	struct drm_device *dev = encoder->dev;
	struct exynos_drm_encoder *exynos_encoder = to_exynos_encoder(encoder);
	struct exynos_drm_display_ops *display_ops =
	exynos_encoder->manager->display_ops;
	unsigned int clone_mask = 0;
	int cnt = 0;

	list_for_each_entry(clone, &dev->mode_config.encoder_list, head) {
	switch (display_ops->type) {
	case EXYNOS_DISPLAY_TYPE_LCD:
	case EXYNOS_DISPLAY_TYPE_HDMI:
	case EXYNOS_DISPLAY_TYPE_VIDI:
	clone_mask \|= (1 << (cnt++));
	break;
	default:
	continue;
	}
	}

	return clone_mask;
	}

	void exynos_drm_encoder_setup(struct drm_device *dev)
	{
	struct drm_encoder *encoder;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
	encoder->possible_clones = exynos_drm_encoder_clones(encoder);
	}

	struct drm_encoder *
	exynos_drm_encoder_create(struct drm_device *dev,
	struct exynos_drm_manager *manager,
	unsigned int possible_crtcs)
	{
	struct drm_encoder *encoder;
	struct exynos_drm_encoder *exynos_encoder;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (!manager \|\| !possible_crtcs)
	return NULL;

	if (!manager->dev)
	return NULL;

	exynos_encoder = kzalloc(sizeof(*exynos_encoder), GFP_KERNEL);
	if (!exynos_encoder) {
	DRM_ERROR("failed to allocate encoder\n");
	return NULL;
	}

	exynos_encoder->dpms = DRM_MODE_DPMS_OFF;
	exynos_encoder->manager = manager;
	encoder = &exynos_encoder->drm_encoder;
	encoder->possible_crtcs = possible_crtcs;

	DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);

	drm_encoder_init(dev, encoder, &exynos_encoder_funcs,
	DRM_MODE_ENCODER_TMDS);

	drm_encoder_helper_add(encoder, &exynos_encoder_helper_funcs);

	DRM_DEBUG_KMS("encoder has been created\n");

	return encoder;
	}

	struct exynos_drm_manager exynos_drm_get_manager(struct drm_encoder encoder)
	{
	return to_exynos_encoder(encoder)->manager;
	}

	void exynos_drm_fn_encoder(struct drm_crtc crtc, void data,
	void (fn)(struct drm_encoder , void *))
	{
	struct drm_device *dev = crtc->dev;
	struct drm_encoder *encoder;
	struct exynos_drm_private *private = dev->dev_private;
	struct exynos_drm_manager *manager;

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
	/*
	* if crtc is detached from encoder, check pipe,
	* otherwise check crtc attached to encoder
	*/
	if (!encoder->crtc) {
	manager = to_exynos_encoder(encoder)->manager;
	if (manager->pipe < 0 \|\|
	private->crtc[manager->pipe] != crtc)
	continue;
	} else {
	if (encoder->crtc != crtc)
	continue;
	}

	fn(encoder, data);
	}
	}

	void exynos_drm_enable_vblank(struct drm_encoder encoder, void data)
	{
	struct exynos_drm_manager *manager =
	to_exynos_encoder(encoder)->manager;
	struct exynos_drm_manager_ops *manager_ops = manager->ops;
	int crtc = (int )data;

	if (manager->pipe != crtc)
	return;

	if (manager_ops->enable_vblank)
	manager_ops->enable_vblank(manager->dev);
	}

	void exynos_drm_disable_vblank(struct drm_encoder encoder, void data)
	{
	struct exynos_drm_manager *manager =
	to_exynos_encoder(encoder)->manager;
	struct exynos_drm_manager_ops *manager_ops = manager->ops;
	int crtc = (int )data;

	if (manager->pipe != crtc)
	return;

	if (manager_ops->disable_vblank)
	manager_ops->disable_vblank(manager->dev);
	}

	void exynos_drm_encoder_crtc_dpms(struct drm_encoder encoder, void data)
	{
	struct exynos_drm_encoder *exynos_encoder = to_exynos_encoder(encoder);
	struct exynos_drm_manager *manager = exynos_encoder->manager;
	struct exynos_drm_manager_ops *manager_ops = manager->ops;
	int mode = (int )data;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (manager_ops && manager_ops->dpms)
	manager_ops->dpms(manager->dev, mode);

	/*
	* set current mode to new one so that data aren't updated into
	* registers by drm_helper_connector_dpms two times.
	*
	* in case that drm_crtc_helper_set_mode() is called,
	* overlay_ops->commit() and manager_ops->commit() callbacks
	* can be called two times, first at drm_crtc_helper_set_mode()
	* and second at drm_helper_connector_dpms().
	* so with this setting, when drm_helper_connector_dpms() is called
	* encoder->funcs->dpms() will be ignored.
	*/
	exynos_encoder->dpms = mode;

	/*
	* if this condition is ok then it means that the crtc is already
	* detached from encoder and last function for detaching is properly
	* done, so clear pipe from manager to prevent repeated call.
	*/
	if (mode > DRM_MODE_DPMS_ON) {
	if (!encoder->crtc)
	manager->pipe = -1;
	}
	}

	void exynos_drm_encoder_crtc_pipe(struct drm_encoder encoder, void data)
	{
	struct exynos_drm_manager *manager =
	to_exynos_encoder(encoder)->manager;
	int pipe = (int )data;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	/*
	* when crtc is detached from encoder, this pipe is used
	* to select manager operation
	*/
	manager->pipe = pipe;
	}

	void exynos_drm_encoder_plane_mode_set(struct drm_encoder encoder, void data)
	{
	struct exynos_drm_manager *manager =
	to_exynos_encoder(encoder)->manager;
	struct exynos_drm_overlay_ops *overlay_ops = manager->overlay_ops;
	struct exynos_drm_overlay *overlay = data;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (overlay_ops && overlay_ops->mode_set)
	overlay_ops->mode_set(manager->dev, overlay);
	}

	void exynos_drm_encoder_plane_commit(struct drm_encoder encoder, void data)
	{
	struct exynos_drm_manager *manager =
	to_exynos_encoder(encoder)->manager;
	struct exynos_drm_overlay_ops *overlay_ops = manager->overlay_ops;
	int zpos = DEFAULT_ZPOS;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (data)
	zpos = (int )data;

	if (overlay_ops && overlay_ops->commit)
	overlay_ops->commit(manager->dev, zpos);
	}

	void exynos_drm_encoder_plane_enable(struct drm_encoder encoder, void data)
	{
	struct exynos_drm_manager *manager =
	to_exynos_encoder(encoder)->manager;
	struct exynos_drm_overlay_ops *overlay_ops = manager->overlay_ops;
	int zpos = DEFAULT_ZPOS;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (data)
	zpos = (int )data;

	if (overlay_ops && overlay_ops->enable)
	overlay_ops->enable(manager->dev, zpos);
	}

	void exynos_drm_encoder_plane_disable(struct drm_encoder encoder, void data)
	{
	struct exynos_drm_manager *manager =
	to_exynos_encoder(encoder)->manager;
	struct exynos_drm_overlay_ops *overlay_ops = manager->overlay_ops;
	int zpos = DEFAULT_ZPOS;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (data)
	zpos = (int )data;

	if (overlay_ops && overlay_ops->disable)
	overlay_ops->disable(manager->dev, zpos);

	/*
	* wait for vblank interrupt
	* - this makes sure that hardware overlay is disabled to avoid
	* for the dma accesses to memory after gem buffer was released
	* because the setting for disabling the overlay will be updated
	* at vsync.
	*/
	if (overlay_ops->wait_for_vblank)
	overlay_ops->wait_for_vblank(manager->dev);
	}