drivers/gpu/drm/exynos/exynos_drm_crtc.c - kernel/msm-4.19 - Gitiles

 /* exynos_drm_crtc.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>
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
  */

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

 #include "exynos_drm_drv.h"
 #include "exynos_drm_encoder.h"
 #include "exynos_drm_plane.h"

 #define to_exynos_crtc(x)	container_of(x, struct exynos_drm_crtc,\
 				drm_crtc)

 enum exynos_crtc_mode {
 	CRTC_MODE_NORMAL,	/* normal mode */
 	CRTC_MODE_BLANK,	/* The private plane of crtc is blank */
 };

 /*
  * Exynos specific crtc structure.
  *
  * @drm_crtc: crtc object.
  * @drm_plane: pointer of private plane object for this crtc
  * @pipe: a crtc index created at load() with a new crtc object creation
  *	and the crtc object would be set to private->crtc array
  *	to get a crtc object corresponding to this pipe from private->crtc
  *	array when irq interrupt occured. the reason of using this pipe is that
  *	drm framework doesn't support multiple irq yet.
  *	we can refer to the crtc to current hardware interrupt occured through
  *	this pipe value.
  * @dpms: store the crtc dpms value
  * @mode: store the crtc mode value
  */
 struct exynos_drm_crtc {
 	struct drm_crtc			drm_crtc;
 	struct drm_plane		*plane;
 	unsigned int			pipe;
 	unsigned int			dpms;
 	enum exynos_crtc_mode		mode;
 	wait_queue_head_t		pending_flip_queue;
 	atomic_t			pending_flip;
 };

 static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
 {
 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 	DRM_DEBUG_KMS("crtc[%d] mode[%d]\n", crtc->base.id, mode);

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

 	if (mode > DRM_MODE_DPMS_ON) {
 		/* wait for the completion of page flip. */
 		wait_event(exynos_crtc->pending_flip_queue,
 				atomic_read(&exynos_crtc->pending_flip) == 0);
 		drm_vblank_off(crtc->dev, exynos_crtc->pipe);
 	}

 	exynos_drm_fn_encoder(crtc, &mode, exynos_drm_encoder_crtc_dpms);
 	exynos_crtc->dpms = mode;
 }

 static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)
 {
 	/* drm framework doesn't check NULL. */
 }

 static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
 {
 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 	exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
 	exynos_plane_commit(exynos_crtc->plane);
 	exynos_plane_dpms(exynos_crtc->plane, DRM_MODE_DPMS_ON);
 }

 static bool
 exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
 			    const struct drm_display_mode *mode,
 			    struct drm_display_mode *adjusted_mode)
 {
 	/* drm framework doesn't check NULL */
 	return true;
 }

 static int
 exynos_drm_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 exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 	struct drm_plane *plane = exynos_crtc->plane;
 	unsigned int crtc_w;
 	unsigned int crtc_h;
 	int pipe = exynos_crtc->pipe;
 	int ret;

 	/*
 	 * copy the mode data adjusted by mode_fixup() into crtc->mode
 	 * so that hardware can be seet to proper mode.
 	 */
 	memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));

 	crtc_w = crtc->fb->width - x;
 	crtc_h = crtc->fb->height - y;

 	ret = exynos_plane_mode_set(plane, crtc, crtc->fb, 0, 0, crtc_w, crtc_h,
 				    x, y, crtc_w, crtc_h);
 	if (ret)
 		return ret;

 	plane->crtc = crtc;
 	plane->fb = crtc->fb;

 	exynos_drm_fn_encoder(crtc, &pipe, exynos_drm_encoder_crtc_pipe);

 	return 0;
 }

 static int exynos_drm_crtc_mode_set_commit(struct drm_crtc *crtc, int x, int y,
 					  struct drm_framebuffer *old_fb)
 {
 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 	struct drm_plane *plane = exynos_crtc->plane;
 	unsigned int crtc_w;
 	unsigned int crtc_h;
 	int ret;

 	/* when framebuffer changing is requested, crtc's dpms should be on */
 	if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
 		DRM_ERROR("failed framebuffer changing request.\n");
 		return -EPERM;
 	}

 	crtc_w = crtc->fb->width - x;
 	crtc_h = crtc->fb->height - y;

 	ret = exynos_plane_mode_set(plane, crtc, crtc->fb, 0, 0, crtc_w, crtc_h,
 				    x, y, crtc_w, crtc_h);
 	if (ret)
 		return ret;

 	exynos_drm_crtc_commit(crtc);

 	return 0;
 }

 static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 					  struct drm_framebuffer *old_fb)
 {
 	return exynos_drm_crtc_mode_set_commit(crtc, x, y, old_fb);
 }

 static void exynos_drm_crtc_disable(struct drm_crtc *crtc)
 {
 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 	exynos_plane_dpms(exynos_crtc->plane, DRM_MODE_DPMS_OFF);
 	exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 }

 static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
 	.dpms		= exynos_drm_crtc_dpms,
 	.prepare	= exynos_drm_crtc_prepare,
 	.commit		= exynos_drm_crtc_commit,
 	.mode_fixup	= exynos_drm_crtc_mode_fixup,
 	.mode_set	= exynos_drm_crtc_mode_set,
 	.mode_set_base	= exynos_drm_crtc_mode_set_base,
 	.disable	= exynos_drm_crtc_disable,
 };

 static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
 				      struct drm_framebuffer *fb,
 				      struct drm_pending_vblank_event *event)
 {
 	struct drm_device *dev = crtc->dev;
 	struct exynos_drm_private *dev_priv = dev->dev_private;
 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 	struct drm_framebuffer *old_fb = crtc->fb;
 	int ret = -EINVAL;

 	/* when the page flip is requested, crtc's dpms should be on */
 	if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
 		DRM_ERROR("failed page flip request.\n");
 		return -EINVAL;
 	}

 	mutex_lock(&dev->struct_mutex);

 	if (event) {
 		/*
 		 * the pipe from user always is 0 so we can set pipe number
 		 * of current owner to event.
 		 */
 		event->pipe = exynos_crtc->pipe;

 		ret = drm_vblank_get(dev, exynos_crtc->pipe);
 		if (ret) {
 			DRM_DEBUG("failed to acquire vblank counter\n");

 			goto out;
 		}

 		spin_lock_irq(&dev->event_lock);
 		list_add_tail(&event->base.link,
 				&dev_priv->pageflip_event_list);
 		atomic_set(&exynos_crtc->pending_flip, 1);
 		spin_unlock_irq(&dev->event_lock);

 		crtc->fb = fb;
 		ret = exynos_drm_crtc_mode_set_commit(crtc, crtc->x, crtc->y,
 						    NULL);
 		if (ret) {
 			crtc->fb = old_fb;

 			spin_lock_irq(&dev->event_lock);
 			drm_vblank_put(dev, exynos_crtc->pipe);
 			list_del(&event->base.link);
 			spin_unlock_irq(&dev->event_lock);

 			goto out;
 		}
 	}
 out:
 	mutex_unlock(&dev->struct_mutex);
 	return ret;
 }

 static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
 {
 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 	struct exynos_drm_private *private = crtc->dev->dev_private;

 	private->crtc[exynos_crtc->pipe] = NULL;

 	drm_crtc_cleanup(crtc);
 	kfree(exynos_crtc);
 }

 static int exynos_drm_crtc_set_property(struct drm_crtc *crtc,
 					struct drm_property *property,
 					uint64_t val)
 {
 	struct drm_device *dev = crtc->dev;
 	struct exynos_drm_private *dev_priv = dev->dev_private;
 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 	if (property == dev_priv->crtc_mode_property) {
 		enum exynos_crtc_mode mode = val;

 		if (mode == exynos_crtc->mode)
 			return 0;

 		exynos_crtc->mode = mode;

 		switch (mode) {
 		case CRTC_MODE_NORMAL:
 			exynos_drm_crtc_commit(crtc);
 			break;
 		case CRTC_MODE_BLANK:
 			exynos_plane_dpms(exynos_crtc->plane,
 					  DRM_MODE_DPMS_OFF);
 			break;
 		default:
 			break;
 		}

 		return 0;
 	}

 	return -EINVAL;
 }

 static struct drm_crtc_funcs exynos_crtc_funcs = {
 	.set_config	= drm_crtc_helper_set_config,
 	.page_flip	= exynos_drm_crtc_page_flip,
 	.destroy	= exynos_drm_crtc_destroy,
 	.set_property	= exynos_drm_crtc_set_property,
 };

 static const struct drm_prop_enum_list mode_names[] = {
 	{ CRTC_MODE_NORMAL, "normal" },
 	{ CRTC_MODE_BLANK, "blank" },
 };

 static void exynos_drm_crtc_attach_mode_property(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
 	struct exynos_drm_private *dev_priv = dev->dev_private;
 	struct drm_property *prop;

 	prop = dev_priv->crtc_mode_property;
 	if (!prop) {
 		prop = drm_property_create_enum(dev, 0, "mode", mode_names,
 						ARRAY_SIZE(mode_names));
 		if (!prop)
 			return;

 		dev_priv->crtc_mode_property = prop;
 	}

 	drm_object_attach_property(&crtc->base, prop, 0);
 }

 int exynos_drm_crtc_create(struct drm_device *dev, unsigned int nr)
 {
 	struct exynos_drm_crtc *exynos_crtc;
 	struct exynos_drm_private *private = dev->dev_private;
 	struct drm_crtc *crtc;

 	exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
 	if (!exynos_crtc) {
 		DRM_ERROR("failed to allocate exynos crtc\n");
 		return -ENOMEM;
 	}

 	exynos_crtc->pipe = nr;
 	exynos_crtc->dpms = DRM_MODE_DPMS_OFF;
 	init_waitqueue_head(&exynos_crtc->pending_flip_queue);
 	atomic_set(&exynos_crtc->pending_flip, 0);
 	exynos_crtc->plane = exynos_plane_init(dev, 1 << nr, true);
 	if (!exynos_crtc->plane) {
 		kfree(exynos_crtc);
 		return -ENOMEM;
 	}

 	crtc = &exynos_crtc->drm_crtc;

 	private->crtc[nr] = crtc;

 	drm_crtc_init(dev, crtc, &exynos_crtc_funcs);
 	drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);

 	exynos_drm_crtc_attach_mode_property(crtc);

 	return 0;
 }

 int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
 {
 	struct exynos_drm_private *private = dev->dev_private;
 	struct exynos_drm_crtc *exynos_crtc =
 		to_exynos_crtc(private->crtc[crtc]);

 	if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 		return -EPERM;

 	exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 			exynos_drm_enable_vblank);

 	return 0;
 }

 void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
 {
 	struct exynos_drm_private *private = dev->dev_private;
 	struct exynos_drm_crtc *exynos_crtc =
 		to_exynos_crtc(private->crtc[crtc]);

 	if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 		return;

 	exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 			exynos_drm_disable_vblank);
 }

 void exynos_drm_crtc_finish_pageflip(struct drm_device *dev, int crtc)
 {
 	struct exynos_drm_private *dev_priv = dev->dev_private;
 	struct drm_pending_vblank_event *e, *t;
 	struct drm_crtc *drm_crtc = dev_priv->crtc[crtc];
 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(drm_crtc);
 	unsigned long flags;

 	spin_lock_irqsave(&dev->event_lock, flags);

 	list_for_each_entry_safe(e, t, &dev_priv->pageflip_event_list,
 			base.link) {
 		/* if event's pipe isn't same as crtc then ignore it. */
 		if (crtc != e->pipe)
 			continue;

 		list_del(&e->base.link);
 		drm_send_vblank_event(dev, -1, e);
 		drm_vblank_put(dev, crtc);
 		atomic_set(&exynos_crtc->pending_flip, 0);
 		wake_up(&exynos_crtc->pending_flip_queue);
 	}

 	spin_unlock_irqrestore(&dev->event_lock, flags);
 }
	/* exynos_drm_crtc.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>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*/

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

	#include "exynos_drm_drv.h"
	#include "exynos_drm_encoder.h"
	#include "exynos_drm_plane.h"

	#define to_exynos_crtc(x) container_of(x, struct exynos_drm_crtc,\
	drm_crtc)

	enum exynos_crtc_mode {
	CRTC_MODE_NORMAL, /* normal mode */
	CRTC_MODE_BLANK, /* The private plane of crtc is blank */
	};

	/*
	* Exynos specific crtc structure.
	*
	* @drm_crtc: crtc object.
	* @drm_plane: pointer of private plane object for this crtc
	* @pipe: a crtc index created at load() with a new crtc object creation
	* and the crtc object would be set to private->crtc array
	* to get a crtc object corresponding to this pipe from private->crtc
	* array when irq interrupt occured. the reason of using this pipe is that
	* drm framework doesn't support multiple irq yet.
	* we can refer to the crtc to current hardware interrupt occured through
	* this pipe value.
	* @dpms: store the crtc dpms value
	* @mode: store the crtc mode value
	*/
	struct exynos_drm_crtc {
	struct drm_crtc drm_crtc;
	struct drm_plane *plane;
	unsigned int pipe;
	unsigned int dpms;
	enum exynos_crtc_mode mode;
	wait_queue_head_t pending_flip_queue;
	atomic_t pending_flip;
	};

	static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
	{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	DRM_DEBUG_KMS("crtc[%d] mode[%d]\n", crtc->base.id, mode);

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

	if (mode > DRM_MODE_DPMS_ON) {
	/* wait for the completion of page flip. */
	wait_event(exynos_crtc->pending_flip_queue,
	atomic_read(&exynos_crtc->pending_flip) == 0);
	drm_vblank_off(crtc->dev, exynos_crtc->pipe);
	}

	exynos_drm_fn_encoder(crtc, &mode, exynos_drm_encoder_crtc_dpms);
	exynos_crtc->dpms = mode;
	}

	static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)
	{
	/* drm framework doesn't check NULL. */
	}

	static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
	{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
	exynos_plane_commit(exynos_crtc->plane);
	exynos_plane_dpms(exynos_crtc->plane, DRM_MODE_DPMS_ON);
	}

	static bool
	exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
	const struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{
	/* drm framework doesn't check NULL */
	return true;
	}

	static int
	exynos_drm_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 exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
	struct drm_plane *plane = exynos_crtc->plane;
	unsigned int crtc_w;
	unsigned int crtc_h;
	int pipe = exynos_crtc->pipe;
	int ret;

	/*
	* copy the mode data adjusted by mode_fixup() into crtc->mode
	* so that hardware can be seet to proper mode.
	*/
	memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));

	crtc_w = crtc->fb->width - x;
	crtc_h = crtc->fb->height - y;

	ret = exynos_plane_mode_set(plane, crtc, crtc->fb, 0, 0, crtc_w, crtc_h,
	x, y, crtc_w, crtc_h);
	if (ret)
	return ret;

	plane->crtc = crtc;
	plane->fb = crtc->fb;

	exynos_drm_fn_encoder(crtc, &pipe, exynos_drm_encoder_crtc_pipe);

	return 0;
	}

	static int exynos_drm_crtc_mode_set_commit(struct drm_crtc *crtc, int x, int y,
	struct drm_framebuffer *old_fb)
	{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
	struct drm_plane *plane = exynos_crtc->plane;
	unsigned int crtc_w;
	unsigned int crtc_h;
	int ret;

	/* when framebuffer changing is requested, crtc's dpms should be on */
	if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
	DRM_ERROR("failed framebuffer changing request.\n");
	return -EPERM;
	}

	crtc_w = crtc->fb->width - x;
	crtc_h = crtc->fb->height - y;

	ret = exynos_plane_mode_set(plane, crtc, crtc->fb, 0, 0, crtc_w, crtc_h,
	x, y, crtc_w, crtc_h);
	if (ret)
	return ret;

	exynos_drm_crtc_commit(crtc);

	return 0;
	}

	static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
	struct drm_framebuffer *old_fb)
	{
	return exynos_drm_crtc_mode_set_commit(crtc, x, y, old_fb);
	}

	static void exynos_drm_crtc_disable(struct drm_crtc *crtc)
	{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	exynos_plane_dpms(exynos_crtc->plane, DRM_MODE_DPMS_OFF);
	exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
	}

	static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
	.dpms = exynos_drm_crtc_dpms,
	.prepare = exynos_drm_crtc_prepare,
	.commit = exynos_drm_crtc_commit,
	.mode_fixup = exynos_drm_crtc_mode_fixup,
	.mode_set = exynos_drm_crtc_mode_set,
	.mode_set_base = exynos_drm_crtc_mode_set_base,
	.disable = exynos_drm_crtc_disable,
	};

	static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
	struct drm_framebuffer *fb,
	struct drm_pending_vblank_event *event)
	{
	struct drm_device *dev = crtc->dev;
	struct exynos_drm_private *dev_priv = dev->dev_private;
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
	struct drm_framebuffer *old_fb = crtc->fb;
	int ret = -EINVAL;

	/* when the page flip is requested, crtc's dpms should be on */
	if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
	DRM_ERROR("failed page flip request.\n");
	return -EINVAL;
	}

	mutex_lock(&dev->struct_mutex);

	if (event) {
	/*
	* the pipe from user always is 0 so we can set pipe number
	* of current owner to event.
	*/
	event->pipe = exynos_crtc->pipe;

	ret = drm_vblank_get(dev, exynos_crtc->pipe);
	if (ret) {
	DRM_DEBUG("failed to acquire vblank counter\n");

	goto out;
	}

	spin_lock_irq(&dev->event_lock);
	list_add_tail(&event->base.link,
	&dev_priv->pageflip_event_list);
	atomic_set(&exynos_crtc->pending_flip, 1);
	spin_unlock_irq(&dev->event_lock);

	crtc->fb = fb;
	ret = exynos_drm_crtc_mode_set_commit(crtc, crtc->x, crtc->y,
	NULL);
	if (ret) {
	crtc->fb = old_fb;

	spin_lock_irq(&dev->event_lock);
	drm_vblank_put(dev, exynos_crtc->pipe);
	list_del(&event->base.link);
	spin_unlock_irq(&dev->event_lock);

	goto out;
	}
	}
	out:
	mutex_unlock(&dev->struct_mutex);
	return ret;
	}

	static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
	{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
	struct exynos_drm_private *private = crtc->dev->dev_private;

	private->crtc[exynos_crtc->pipe] = NULL;

	drm_crtc_cleanup(crtc);
	kfree(exynos_crtc);
	}

	static int exynos_drm_crtc_set_property(struct drm_crtc *crtc,
	struct drm_property *property,
	uint64_t val)
	{
	struct drm_device *dev = crtc->dev;
	struct exynos_drm_private *dev_priv = dev->dev_private;
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	if (property == dev_priv->crtc_mode_property) {
	enum exynos_crtc_mode mode = val;

	if (mode == exynos_crtc->mode)
	return 0;

	exynos_crtc->mode = mode;

	switch (mode) {
	case CRTC_MODE_NORMAL:
	exynos_drm_crtc_commit(crtc);
	break;
	case CRTC_MODE_BLANK:
	exynos_plane_dpms(exynos_crtc->plane,
	DRM_MODE_DPMS_OFF);
	break;
	default:
	break;
	}

	return 0;
	}

	return -EINVAL;
	}

	static struct drm_crtc_funcs exynos_crtc_funcs = {
	.set_config = drm_crtc_helper_set_config,
	.page_flip = exynos_drm_crtc_page_flip,
	.destroy = exynos_drm_crtc_destroy,
	.set_property = exynos_drm_crtc_set_property,
	};

	static const struct drm_prop_enum_list mode_names[] = {
	{ CRTC_MODE_NORMAL, "normal" },
	{ CRTC_MODE_BLANK, "blank" },
	};

	static void exynos_drm_crtc_attach_mode_property(struct drm_crtc *crtc)
	{
	struct drm_device *dev = crtc->dev;
	struct exynos_drm_private *dev_priv = dev->dev_private;
	struct drm_property *prop;

	prop = dev_priv->crtc_mode_property;
	if (!prop) {
	prop = drm_property_create_enum(dev, 0, "mode", mode_names,
	ARRAY_SIZE(mode_names));
	if (!prop)
	return;

	dev_priv->crtc_mode_property = prop;
	}

	drm_object_attach_property(&crtc->base, prop, 0);
	}

	int exynos_drm_crtc_create(struct drm_device *dev, unsigned int nr)
	{
	struct exynos_drm_crtc *exynos_crtc;
	struct exynos_drm_private *private = dev->dev_private;
	struct drm_crtc *crtc;

	exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
	if (!exynos_crtc) {
	DRM_ERROR("failed to allocate exynos crtc\n");
	return -ENOMEM;
	}

	exynos_crtc->pipe = nr;
	exynos_crtc->dpms = DRM_MODE_DPMS_OFF;
	init_waitqueue_head(&exynos_crtc->pending_flip_queue);
	atomic_set(&exynos_crtc->pending_flip, 0);
	exynos_crtc->plane = exynos_plane_init(dev, 1 << nr, true);
	if (!exynos_crtc->plane) {
	kfree(exynos_crtc);
	return -ENOMEM;
	}

	crtc = &exynos_crtc->drm_crtc;

	private->crtc[nr] = crtc;

	drm_crtc_init(dev, crtc, &exynos_crtc_funcs);
	drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);

	exynos_drm_crtc_attach_mode_property(crtc);

	return 0;
	}

	int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
	{
	struct exynos_drm_private *private = dev->dev_private;
	struct exynos_drm_crtc *exynos_crtc =
	to_exynos_crtc(private->crtc[crtc]);

	if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
	return -EPERM;

	exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
	exynos_drm_enable_vblank);

	return 0;
	}

	void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
	{
	struct exynos_drm_private *private = dev->dev_private;
	struct exynos_drm_crtc *exynos_crtc =
	to_exynos_crtc(private->crtc[crtc]);

	if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
	return;

	exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
	exynos_drm_disable_vblank);
	}

	void exynos_drm_crtc_finish_pageflip(struct drm_device *dev, int crtc)
	{
	struct exynos_drm_private *dev_priv = dev->dev_private;
	struct drm_pending_vblank_event e, t;
	struct drm_crtc *drm_crtc = dev_priv->crtc[crtc];
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(drm_crtc);
	unsigned long flags;

	spin_lock_irqsave(&dev->event_lock, flags);

	list_for_each_entry_safe(e, t, &dev_priv->pageflip_event_list,
	base.link) {
	/* if event's pipe isn't same as crtc then ignore it. */
	if (crtc != e->pipe)
	continue;

	list_del(&e->base.link);
	drm_send_vblank_event(dev, -1, e);
	drm_vblank_put(dev, crtc);
	atomic_set(&exynos_crtc->pending_flip, 0);
	wake_up(&exynos_crtc->pending_flip_queue);
	}

	spin_unlock_irqrestore(&dev->event_lock, flags);
	}