drivers/gpu/drm/exynos/exynos_drm_vidi.c - kernel/common - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /* exynos_drm_vidi.c
  *
  * Copyright (C) 2012 Samsung Electronics Co.Ltd
  * Authors:
  *	Inki Dae <[email protected]>
  */

 #include <linux/component.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/timer.h>

 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_simple_kms_helper.h>
 #include <drm/drm_vblank.h>
 #include <drm/exynos_drm.h>

 #include "exynos_drm_crtc.h"
 #include "exynos_drm_drv.h"
 #include "exynos_drm_fb.h"
 #include "exynos_drm_plane.h"
 #include "exynos_drm_vidi.h"

 /* VIDI uses fixed refresh rate of 50Hz */
 #define VIDI_REFRESH_TIME (1000 / 50)

 /* vidi has totally three virtual windows. */
 #define WINDOWS_NR		3

 #define ctx_from_connector(c)	container_of(c, struct vidi_context, \
 					connector)

 struct vidi_context {
 	struct drm_encoder		encoder;
 	struct drm_device		*drm_dev;
 	struct device			*dev;
 	struct exynos_drm_crtc		*crtc;
 	struct drm_connector		connector;
 	struct exynos_drm_plane		planes[WINDOWS_NR];
 	struct edid			*raw_edid;
 	unsigned int			clkdiv;
 	unsigned int			connected;
 	bool				suspended;
 	struct timer_list		timer;
 	struct mutex			lock;
 };

 static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e)
 {
 	return container_of(e, struct vidi_context, encoder);
 }

 static const char fake_edid_info[] = {
 	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
 	0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
 	0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
 	0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
 	0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
 	0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
 	0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
 	0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
 	0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
 	0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
 	0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
 	0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
 	0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
 	0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
 	0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
 	0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
 	0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	0x00, 0x00, 0x00, 0x06
 };

 static const uint32_t formats[] = {
 	DRM_FORMAT_XRGB8888,
 	DRM_FORMAT_ARGB8888,
 	DRM_FORMAT_NV12,
 };

 static const enum drm_plane_type vidi_win_types[WINDOWS_NR] = {
 	DRM_PLANE_TYPE_PRIMARY,
 	DRM_PLANE_TYPE_OVERLAY,
 	DRM_PLANE_TYPE_CURSOR,
 };

 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
 {
 	struct vidi_context *ctx = crtc->ctx;

 	if (ctx->suspended)
 		return -EPERM;

 	mod_timer(&ctx->timer,
 		jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);

 	return 0;
 }

 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
 {
 }

 static void vidi_update_plane(struct exynos_drm_crtc *crtc,
 			      struct exynos_drm_plane *plane)
 {
 	struct drm_plane_state *state = plane->base.state;
 	struct vidi_context *ctx = crtc->ctx;
 	dma_addr_t addr;

 	if (ctx->suspended)
 		return;

 	addr = exynos_drm_fb_dma_addr(state->fb, 0);
 	DRM_DEV_DEBUG_KMS(ctx->dev, "dma_addr = %pad\n", &addr);
 }

 static void vidi_atomic_enable(struct exynos_drm_crtc *crtc)
 {
 	struct vidi_context *ctx = crtc->ctx;

 	mutex_lock(&ctx->lock);

 	ctx->suspended = false;

 	mutex_unlock(&ctx->lock);

 	drm_crtc_vblank_on(&crtc->base);
 }

 static void vidi_atomic_disable(struct exynos_drm_crtc *crtc)
 {
 	struct vidi_context *ctx = crtc->ctx;

 	drm_crtc_vblank_off(&crtc->base);

 	mutex_lock(&ctx->lock);

 	ctx->suspended = true;

 	mutex_unlock(&ctx->lock);
 }

 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
 	.atomic_enable = vidi_atomic_enable,
 	.atomic_disable = vidi_atomic_disable,
 	.enable_vblank = vidi_enable_vblank,
 	.disable_vblank = vidi_disable_vblank,
 	.update_plane = vidi_update_plane,
 	.atomic_flush = exynos_crtc_handle_event,
 };

 static void vidi_fake_vblank_timer(struct timer_list *t)
 {
 	struct vidi_context *ctx = from_timer(ctx, t, timer);

 	if (drm_crtc_handle_vblank(&ctx->crtc->base))
 		mod_timer(&ctx->timer,
 			jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
 }

 static ssize_t vidi_show_connection(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	struct vidi_context *ctx = dev_get_drvdata(dev);
 	int rc;

 	mutex_lock(&ctx->lock);

 	rc = sprintf(buf, "%d\n", ctx->connected);

 	mutex_unlock(&ctx->lock);

 	return rc;
 }

 static ssize_t vidi_store_connection(struct device *dev,
 				struct device_attribute *attr,
 				const char *buf, size_t len)
 {
 	struct vidi_context *ctx = dev_get_drvdata(dev);
 	int ret;

 	ret = kstrtoint(buf, 0, &ctx->connected);
 	if (ret)
 		return ret;

 	if (ctx->connected > 1)
 		return -EINVAL;

 	/* use fake edid data for test. */
 	if (!ctx->raw_edid)
 		ctx->raw_edid = (struct edid *)fake_edid_info;

 	/* if raw_edid isn't same as fake data then it can't be tested. */
 	if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 		DRM_DEV_DEBUG_KMS(dev, "edid data is not fake data.\n");
 		return -EINVAL;
 	}

 	DRM_DEV_DEBUG_KMS(dev, "requested connection.\n");

 	drm_helper_hpd_irq_event(ctx->drm_dev);

 	return len;
 }

 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
 			vidi_store_connection);

 static struct attribute *vidi_attrs[] = {
 	&dev_attr_connection.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(vidi);

 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
 				struct drm_file *file_priv)
 {
 	struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
 	struct drm_exynos_vidi_connection *vidi = data;

 	if (!vidi) {
 		DRM_DEV_DEBUG_KMS(ctx->dev,
 				  "user data for vidi is null.\n");
 		return -EINVAL;
 	}

 	if (vidi->connection > 1) {
 		DRM_DEV_DEBUG_KMS(ctx->dev,
 				  "connection should be 0 or 1.\n");
 		return -EINVAL;
 	}

 	if (ctx->connected == vidi->connection) {
 		DRM_DEV_DEBUG_KMS(ctx->dev,
 				  "same connection request.\n");
 		return -EINVAL;
 	}

 	if (vidi->connection) {
 		struct edid *raw_edid;

 		raw_edid = (struct edid *)(unsigned long)vidi->edid;
 		if (!drm_edid_is_valid(raw_edid)) {
 			DRM_DEV_DEBUG_KMS(ctx->dev,
 					  "edid data is invalid.\n");
 			return -EINVAL;
 		}
 		ctx->raw_edid = drm_edid_duplicate(raw_edid);
 		if (!ctx->raw_edid) {
 			DRM_DEV_DEBUG_KMS(ctx->dev,
 					  "failed to allocate raw_edid.\n");
 			return -ENOMEM;
 		}
 	} else {
 		/*
 		 * with connection = 0, free raw_edid
 		 * only if raw edid data isn't same as fake data.
 		 */
 		if (ctx->raw_edid && ctx->raw_edid !=
 				(struct edid *)fake_edid_info) {
 			kfree(ctx->raw_edid);
 			ctx->raw_edid = NULL;
 		}
 	}

 	ctx->connected = vidi->connection;
 	drm_helper_hpd_irq_event(ctx->drm_dev);

 	return 0;
 }

 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
 			bool force)
 {
 	struct vidi_context *ctx = ctx_from_connector(connector);

 	/*
 	 * connection request would come from user side
 	 * to do hotplug through specific ioctl.
 	 */
 	return ctx->connected ? connector_status_connected :
 			connector_status_disconnected;
 }

 static void vidi_connector_destroy(struct drm_connector *connector)
 {
 }

 static const struct drm_connector_funcs vidi_connector_funcs = {
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.detect = vidi_detect,
 	.destroy = vidi_connector_destroy,
 	.reset = drm_atomic_helper_connector_reset,
 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };

 static int vidi_get_modes(struct drm_connector *connector)
 {
 	struct vidi_context *ctx = ctx_from_connector(connector);
 	struct edid *edid;
 	int edid_len;

 	/*
 	 * the edid data comes from user side and it would be set
 	 * to ctx->raw_edid through specific ioctl.
 	 */
 	if (!ctx->raw_edid) {
 		DRM_DEV_DEBUG_KMS(ctx->dev, "raw_edid is null.\n");
 		return -EFAULT;
 	}

 	edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
 	edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
 	if (!edid) {
 		DRM_DEV_DEBUG_KMS(ctx->dev, "failed to allocate edid\n");
 		return -ENOMEM;
 	}

 	drm_connector_update_edid_property(connector, edid);

 	return drm_add_edid_modes(connector, edid);
 }

 static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
 	.get_modes = vidi_get_modes,
 };

 static int vidi_create_connector(struct drm_encoder *encoder)
 {
 	struct vidi_context *ctx = encoder_to_vidi(encoder);
 	struct drm_connector *connector = &ctx->connector;
 	int ret;

 	connector->polled = DRM_CONNECTOR_POLL_HPD;

 	ret = drm_connector_init(ctx->drm_dev, connector,
 			&vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
 	if (ret) {
 		DRM_DEV_ERROR(ctx->dev,
 			      "Failed to initialize connector with drm\n");
 		return ret;
 	}

 	drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
 	drm_connector_attach_encoder(connector, encoder);

 	return 0;
 }

 static void exynos_vidi_mode_set(struct drm_encoder *encoder,
 			       struct drm_display_mode *mode,
 			       struct drm_display_mode *adjusted_mode)
 {
 }

 static void exynos_vidi_enable(struct drm_encoder *encoder)
 {
 }

 static void exynos_vidi_disable(struct drm_encoder *encoder)
 {
 }

 static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
 	.mode_set = exynos_vidi_mode_set,
 	.enable = exynos_vidi_enable,
 	.disable = exynos_vidi_disable,
 };

 static int vidi_bind(struct device *dev, struct device *master, void *data)
 {
 	struct vidi_context *ctx = dev_get_drvdata(dev);
 	struct drm_device *drm_dev = data;
 	struct drm_encoder *encoder = &ctx->encoder;
 	struct exynos_drm_plane *exynos_plane;
 	struct exynos_drm_plane_config plane_config = { 0 };
 	unsigned int i;
 	int ret;

 	ctx->drm_dev = drm_dev;

 	plane_config.pixel_formats = formats;
 	plane_config.num_pixel_formats = ARRAY_SIZE(formats);

 	for (i = 0; i < WINDOWS_NR; i++) {
 		plane_config.zpos = i;
 		plane_config.type = vidi_win_types[i];

 		ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
 					&plane_config);
 		if (ret)
 			return ret;
 	}

 	exynos_plane = &ctx->planes[DEFAULT_WIN];
 	ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
 			EXYNOS_DISPLAY_TYPE_VIDI, &vidi_crtc_ops, ctx);
 	if (IS_ERR(ctx->crtc)) {
 		DRM_DEV_ERROR(dev, "failed to create crtc.\n");
 		return PTR_ERR(ctx->crtc);
 	}

 	drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);

 	drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);

 	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_VIDI);
 	if (ret < 0)
 		return ret;

 	ret = vidi_create_connector(encoder);
 	if (ret) {
 		DRM_DEV_ERROR(dev, "failed to create connector ret = %d\n",
 			      ret);
 		drm_encoder_cleanup(encoder);
 		return ret;
 	}

 	return 0;
 }


 static void vidi_unbind(struct device *dev, struct device *master, void *data)
 {
 	struct vidi_context *ctx = dev_get_drvdata(dev);

 	del_timer_sync(&ctx->timer);
 }

 static const struct component_ops vidi_component_ops = {
 	.bind	= vidi_bind,
 	.unbind = vidi_unbind,
 };

 static int vidi_probe(struct platform_device *pdev)
 {
 	struct vidi_context *ctx;
 	struct device *dev = &pdev->dev;

 	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;

 	ctx->dev = dev;

 	timer_setup(&ctx->timer, vidi_fake_vblank_timer, 0);

 	mutex_init(&ctx->lock);

 	platform_set_drvdata(pdev, ctx);

 	return component_add(dev, &vidi_component_ops);
 }

 static int vidi_remove(struct platform_device *pdev)
 {
 	struct vidi_context *ctx = platform_get_drvdata(pdev);

 	if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 		kfree(ctx->raw_edid);
 		ctx->raw_edid = NULL;

 		return -EINVAL;
 	}

 	component_del(&pdev->dev, &vidi_component_ops);

 	return 0;
 }

 struct platform_driver vidi_driver = {
 	.probe		= vidi_probe,
 	.remove		= vidi_remove,
 	.driver		= {
 		.name	= "exynos-drm-vidi",
 		.owner	= THIS_MODULE,
 		.dev_groups = vidi_groups,
 	},
 };
	// SPDX-License-Identifier: GPL-2.0-or-later
	/* exynos_drm_vidi.c
	*
	* Copyright (C) 2012 Samsung Electronics Co.Ltd
	* Authors:
	* Inki Dae <[email protected]>
	*/

	#include <linux/component.h>
	#include <linux/kernel.h>
	#include <linux/platform_device.h>
	#include <linux/timer.h>

	#include <drm/drm_atomic_helper.h>
	#include <drm/drm_edid.h>
	#include <drm/drm_probe_helper.h>
	#include <drm/drm_simple_kms_helper.h>
	#include <drm/drm_vblank.h>
	#include <drm/exynos_drm.h>

	#include "exynos_drm_crtc.h"
	#include "exynos_drm_drv.h"
	#include "exynos_drm_fb.h"
	#include "exynos_drm_plane.h"
	#include "exynos_drm_vidi.h"

	/* VIDI uses fixed refresh rate of 50Hz */
	#define VIDI_REFRESH_TIME (1000 / 50)

	/* vidi has totally three virtual windows. */
	#define WINDOWS_NR 3

	#define ctx_from_connector(c) container_of(c, struct vidi_context, \
	connector)

	struct vidi_context {
	struct drm_encoder encoder;
	struct drm_device *drm_dev;
	struct device *dev;
	struct exynos_drm_crtc *crtc;
	struct drm_connector connector;
	struct exynos_drm_plane planes[WINDOWS_NR];
	struct edid *raw_edid;
	unsigned int clkdiv;
	unsigned int connected;
	bool suspended;
	struct timer_list timer;
	struct mutex lock;
	};

	static inline struct vidi_context encoder_to_vidi(struct drm_encoder e)
	{
	return container_of(e, struct vidi_context, encoder);
	}

	static const char fake_edid_info[] = {
	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
	0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
	0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
	0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
	0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
	0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
	0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
	0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
	0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
	0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
	0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
	0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
	0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
	0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
	0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
	0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x06
	};

	static const uint32_t formats[] = {
	DRM_FORMAT_XRGB8888,
	DRM_FORMAT_ARGB8888,
	DRM_FORMAT_NV12,
	};

	static const enum drm_plane_type vidi_win_types[WINDOWS_NR] = {
	DRM_PLANE_TYPE_PRIMARY,
	DRM_PLANE_TYPE_OVERLAY,
	DRM_PLANE_TYPE_CURSOR,
	};

	static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
	{
	struct vidi_context *ctx = crtc->ctx;

	if (ctx->suspended)
	return -EPERM;

	mod_timer(&ctx->timer,
	jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);

	return 0;
	}

	static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
	{
	}

	static void vidi_update_plane(struct exynos_drm_crtc *crtc,
	struct exynos_drm_plane *plane)
	{
	struct drm_plane_state *state = plane->base.state;
	struct vidi_context *ctx = crtc->ctx;
	dma_addr_t addr;

	if (ctx->suspended)
	return;

	addr = exynos_drm_fb_dma_addr(state->fb, 0);
	DRM_DEV_DEBUG_KMS(ctx->dev, "dma_addr = %pad\n", &addr);
	}

	static void vidi_atomic_enable(struct exynos_drm_crtc *crtc)
	{
	struct vidi_context *ctx = crtc->ctx;

	mutex_lock(&ctx->lock);

	ctx->suspended = false;

	mutex_unlock(&ctx->lock);

	drm_crtc_vblank_on(&crtc->base);
	}

	static void vidi_atomic_disable(struct exynos_drm_crtc *crtc)
	{
	struct vidi_context *ctx = crtc->ctx;

	drm_crtc_vblank_off(&crtc->base);

	mutex_lock(&ctx->lock);

	ctx->suspended = true;

	mutex_unlock(&ctx->lock);
	}

	static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
	.atomic_enable = vidi_atomic_enable,
	.atomic_disable = vidi_atomic_disable,
	.enable_vblank = vidi_enable_vblank,
	.disable_vblank = vidi_disable_vblank,
	.update_plane = vidi_update_plane,
	.atomic_flush = exynos_crtc_handle_event,
	};

	static void vidi_fake_vblank_timer(struct timer_list *t)
	{
	struct vidi_context *ctx = from_timer(ctx, t, timer);

	if (drm_crtc_handle_vblank(&ctx->crtc->base))
	mod_timer(&ctx->timer,
	jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
	}

	static ssize_t vidi_show_connection(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct vidi_context *ctx = dev_get_drvdata(dev);
	int rc;

	mutex_lock(&ctx->lock);

	rc = sprintf(buf, "%d\n", ctx->connected);

	mutex_unlock(&ctx->lock);

	return rc;
	}

	static ssize_t vidi_store_connection(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	struct vidi_context *ctx = dev_get_drvdata(dev);
	int ret;

	ret = kstrtoint(buf, 0, &ctx->connected);
	if (ret)
	return ret;

	if (ctx->connected > 1)
	return -EINVAL;

	/* use fake edid data for test. */
	if (!ctx->raw_edid)
	ctx->raw_edid = (struct edid *)fake_edid_info;

	/* if raw_edid isn't same as fake data then it can't be tested. */
	if (ctx->raw_edid != (struct edid *)fake_edid_info) {
	DRM_DEV_DEBUG_KMS(dev, "edid data is not fake data.\n");
	return -EINVAL;
	}

	DRM_DEV_DEBUG_KMS(dev, "requested connection.\n");

	drm_helper_hpd_irq_event(ctx->drm_dev);

	return len;
	}

	static DEVICE_ATTR(connection, 0644, vidi_show_connection,
	vidi_store_connection);

	static struct attribute *vidi_attrs[] = {
	&dev_attr_connection.attr,
	NULL,
	};
	ATTRIBUTE_GROUPS(vidi);

	int vidi_connection_ioctl(struct drm_device drm_dev, void data,
	struct drm_file *file_priv)
	{
	struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
	struct drm_exynos_vidi_connection *vidi = data;

	if (!vidi) {
	DRM_DEV_DEBUG_KMS(ctx->dev,
	"user data for vidi is null.\n");
	return -EINVAL;
	}

	if (vidi->connection > 1) {
	DRM_DEV_DEBUG_KMS(ctx->dev,
	"connection should be 0 or 1.\n");
	return -EINVAL;
	}

	if (ctx->connected == vidi->connection) {
	DRM_DEV_DEBUG_KMS(ctx->dev,
	"same connection request.\n");
	return -EINVAL;
	}

	if (vidi->connection) {
	struct edid *raw_edid;

	raw_edid = (struct edid *)(unsigned long)vidi->edid;
	if (!drm_edid_is_valid(raw_edid)) {
	DRM_DEV_DEBUG_KMS(ctx->dev,
	"edid data is invalid.\n");
	return -EINVAL;
	}
	ctx->raw_edid = drm_edid_duplicate(raw_edid);
	if (!ctx->raw_edid) {
	DRM_DEV_DEBUG_KMS(ctx->dev,
	"failed to allocate raw_edid.\n");
	return -ENOMEM;
	}
	} else {
	/*
	* with connection = 0, free raw_edid
	* only if raw edid data isn't same as fake data.
	*/
	if (ctx->raw_edid && ctx->raw_edid !=
	(struct edid *)fake_edid_info) {
	kfree(ctx->raw_edid);
	ctx->raw_edid = NULL;
	}
	}

	ctx->connected = vidi->connection;
	drm_helper_hpd_irq_event(ctx->drm_dev);

	return 0;
	}

	static enum drm_connector_status vidi_detect(struct drm_connector *connector,
	bool force)
	{
	struct vidi_context *ctx = ctx_from_connector(connector);

	/*
	* connection request would come from user side
	* to do hotplug through specific ioctl.
	*/
	return ctx->connected ? connector_status_connected :
	connector_status_disconnected;
	}

	static void vidi_connector_destroy(struct drm_connector *connector)
	{
	}

	static const struct drm_connector_funcs vidi_connector_funcs = {
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = vidi_detect,
	.destroy = vidi_connector_destroy,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
	};

	static int vidi_get_modes(struct drm_connector *connector)
	{
	struct vidi_context *ctx = ctx_from_connector(connector);
	struct edid *edid;
	int edid_len;

	/*
	* the edid data comes from user side and it would be set
	* to ctx->raw_edid through specific ioctl.
	*/
	if (!ctx->raw_edid) {
	DRM_DEV_DEBUG_KMS(ctx->dev, "raw_edid is null.\n");
	return -EFAULT;
	}

	edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
	edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
	if (!edid) {
	DRM_DEV_DEBUG_KMS(ctx->dev, "failed to allocate edid\n");
	return -ENOMEM;
	}

	drm_connector_update_edid_property(connector, edid);

	return drm_add_edid_modes(connector, edid);
	}

	static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
	.get_modes = vidi_get_modes,
	};

	static int vidi_create_connector(struct drm_encoder *encoder)
	{
	struct vidi_context *ctx = encoder_to_vidi(encoder);
	struct drm_connector *connector = &ctx->connector;
	int ret;

	connector->polled = DRM_CONNECTOR_POLL_HPD;

	ret = drm_connector_init(ctx->drm_dev, connector,
	&vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
	if (ret) {
	DRM_DEV_ERROR(ctx->dev,
	"Failed to initialize connector with drm\n");
	return ret;
	}

	drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
	drm_connector_attach_encoder(connector, encoder);

	return 0;
	}

	static void exynos_vidi_mode_set(struct drm_encoder *encoder,
	struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{
	}

	static void exynos_vidi_enable(struct drm_encoder *encoder)
	{
	}

	static void exynos_vidi_disable(struct drm_encoder *encoder)
	{
	}

	static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
	.mode_set = exynos_vidi_mode_set,
	.enable = exynos_vidi_enable,
	.disable = exynos_vidi_disable,
	};

	static int vidi_bind(struct device dev, struct device master, void *data)
	{
	struct vidi_context *ctx = dev_get_drvdata(dev);
	struct drm_device *drm_dev = data;
	struct drm_encoder *encoder = &ctx->encoder;
	struct exynos_drm_plane *exynos_plane;
	struct exynos_drm_plane_config plane_config = { 0 };
	unsigned int i;
	int ret;

	ctx->drm_dev = drm_dev;

	plane_config.pixel_formats = formats;
	plane_config.num_pixel_formats = ARRAY_SIZE(formats);

	for (i = 0; i < WINDOWS_NR; i++) {
	plane_config.zpos = i;
	plane_config.type = vidi_win_types[i];

	ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
	&plane_config);
	if (ret)
	return ret;
	}

	exynos_plane = &ctx->planes[DEFAULT_WIN];
	ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
	EXYNOS_DISPLAY_TYPE_VIDI, &vidi_crtc_ops, ctx);
	if (IS_ERR(ctx->crtc)) {
	DRM_DEV_ERROR(dev, "failed to create crtc.\n");
	return PTR_ERR(ctx->crtc);
	}

	drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);

	drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);

	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_VIDI);
	if (ret < 0)
	return ret;

	ret = vidi_create_connector(encoder);
	if (ret) {
	DRM_DEV_ERROR(dev, "failed to create connector ret = %d\n",
	ret);
	drm_encoder_cleanup(encoder);
	return ret;
	}

	return 0;
	}


	static void vidi_unbind(struct device dev, struct device master, void *data)
	{
	struct vidi_context *ctx = dev_get_drvdata(dev);

	del_timer_sync(&ctx->timer);
	}

	static const struct component_ops vidi_component_ops = {
	.bind = vidi_bind,
	.unbind = vidi_unbind,
	};

	static int vidi_probe(struct platform_device *pdev)
	{
	struct vidi_context *ctx;
	struct device *dev = &pdev->dev;

	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
	return -ENOMEM;

	ctx->dev = dev;

	timer_setup(&ctx->timer, vidi_fake_vblank_timer, 0);

	mutex_init(&ctx->lock);

	platform_set_drvdata(pdev, ctx);

	return component_add(dev, &vidi_component_ops);
	}

	static int vidi_remove(struct platform_device *pdev)
	{
	struct vidi_context *ctx = platform_get_drvdata(pdev);

	if (ctx->raw_edid != (struct edid *)fake_edid_info) {
	kfree(ctx->raw_edid);
	ctx->raw_edid = NULL;

	return -EINVAL;
	}

	component_del(&pdev->dev, &vidi_component_ops);

	return 0;
	}

	struct platform_driver vidi_driver = {
	.probe = vidi_probe,
	.remove = vidi_remove,
	.driver = {
	.name = "exynos-drm-vidi",
	.owner = THIS_MODULE,
	.dev_groups = vidi_groups,
	},
	};