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

 /* exynos_drm_vidi.c
  *
  * Copyright (C) 2012 Samsung Electronics Co.Ltd
  * Authors:
  *	Inki Dae <inki.dae@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 <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/component.h>

 #include <drm/exynos_drm.h>

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

 #include "exynos_drm_drv.h"
 #include "exynos_drm_crtc.h"
 #include "exynos_drm_encoder.h"
 #include "exynos_drm_vidi.h"

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

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

 struct vidi_win_data {
 	unsigned int		offset_x;
 	unsigned int		offset_y;
 	unsigned int		ovl_width;
 	unsigned int		ovl_height;
 	unsigned int		fb_width;
 	unsigned int		fb_height;
 	unsigned int		bpp;
 	dma_addr_t		dma_addr;
 	unsigned int		buf_offsize;
 	unsigned int		line_size;	/* bytes */
 	bool			enabled;
 };

 struct vidi_context {
 	struct exynos_drm_display	display;
 	struct platform_device		*pdev;
 	struct drm_device		*drm_dev;
 	struct exynos_drm_crtc		*crtc;
 	struct drm_encoder		*encoder;
 	struct drm_connector		connector;
 	struct vidi_win_data		win_data[WINDOWS_NR];
 	struct edid			*raw_edid;
 	unsigned int			clkdiv;
 	unsigned int			default_win;
 	unsigned long			irq_flags;
 	unsigned int			connected;
 	bool				vblank_on;
 	bool				suspended;
 	bool				direct_vblank;
 	struct work_struct		work;
 	struct mutex			lock;
 	int				pipe;
 };

 static inline struct vidi_context *display_to_vidi(struct exynos_drm_display *d)
 {
 	return container_of(d, struct vidi_context, display);
 }

 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 void vidi_apply(struct vidi_context *ctx)
 {
 	struct exynos_drm_crtc_ops *crtc_ops = ctx->crtc->ops;
 	struct vidi_win_data *win_data;
 	int i;

 	for (i = 0; i < WINDOWS_NR; i++) {
 		win_data = &ctx->win_data[i];
 		if (win_data->enabled && (crtc_ops && crtc_ops->win_commit))
 			crtc_ops->win_commit(ctx->crtc, i);
 	}
 }

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

 	if (ctx->suspended)
 		return -EPERM;

 	if (!test_and_set_bit(0, &ctx->irq_flags))
 		ctx->vblank_on = true;

 	ctx->direct_vblank = true;

 	/*
 	 * in case of page flip request, vidi_finish_pageflip function
 	 * will not be called because direct_vblank is true and then
 	 * that function will be called by crtc_ops->win_commit callback
 	 */
 	schedule_work(&ctx->work);

 	return 0;
 }

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

 	if (ctx->suspended)
 		return;

 	if (test_and_clear_bit(0, &ctx->irq_flags))
 		ctx->vblank_on = false;
 }

 static void vidi_win_mode_set(struct exynos_drm_crtc *crtc,
 			struct exynos_drm_plane *plane)
 {
 	struct vidi_context *ctx = crtc->ctx;
 	struct vidi_win_data *win_data;
 	int win;
 	unsigned long offset;

 	if (!plane) {
 		DRM_ERROR("plane is NULL\n");
 		return;
 	}

 	win = plane->zpos;
 	if (win == DEFAULT_ZPOS)
 		win = ctx->default_win;

 	if (win < 0 || win >= WINDOWS_NR)
 		return;

 	offset = plane->fb_x * (plane->bpp >> 3);
 	offset += plane->fb_y * plane->pitch;

 	DRM_DEBUG_KMS("offset = 0x%lx, pitch = %x\n", offset, plane->pitch);

 	win_data = &ctx->win_data[win];

 	win_data->offset_x = plane->crtc_x;
 	win_data->offset_y = plane->crtc_y;
 	win_data->ovl_width = plane->crtc_width;
 	win_data->ovl_height = plane->crtc_height;
 	win_data->fb_width = plane->fb_width;
 	win_data->fb_height = plane->fb_height;
 	win_data->dma_addr = plane->dma_addr[0] + offset;
 	win_data->bpp = plane->bpp;
 	win_data->buf_offsize = (plane->fb_width - plane->crtc_width) *
 				(plane->bpp >> 3);
 	win_data->line_size = plane->crtc_width * (plane->bpp >> 3);

 	/*
 	 * some parts of win_data should be transferred to user side
 	 * through specific ioctl.
 	 */

 	DRM_DEBUG_KMS("offset_x = %d, offset_y = %d\n",
 			win_data->offset_x, win_data->offset_y);
 	DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n",
 			win_data->ovl_width, win_data->ovl_height);
 	DRM_DEBUG_KMS("paddr = 0x%lx\n", (unsigned long)win_data->dma_addr);
 	DRM_DEBUG_KMS("fb_width = %d, crtc_width = %d\n",
 			plane->fb_width, plane->crtc_width);
 }

 static void vidi_win_commit(struct exynos_drm_crtc *crtc, int zpos)
 {
 	struct vidi_context *ctx = crtc->ctx;
 	struct vidi_win_data *win_data;
 	int win = zpos;

 	if (ctx->suspended)
 		return;

 	if (win == DEFAULT_ZPOS)
 		win = ctx->default_win;

 	if (win < 0 || win >= WINDOWS_NR)
 		return;

 	win_data = &ctx->win_data[win];

 	win_data->enabled = true;

 	DRM_DEBUG_KMS("dma_addr = %pad\n", &win_data->dma_addr);

 	if (ctx->vblank_on)
 		schedule_work(&ctx->work);
 }

 static void vidi_win_disable(struct exynos_drm_crtc *crtc, int zpos)
 {
 	struct vidi_context *ctx = crtc->ctx;
 	struct vidi_win_data *win_data;
 	int win = zpos;

 	if (win == DEFAULT_ZPOS)
 		win = ctx->default_win;

 	if (win < 0 || win >= WINDOWS_NR)
 		return;

 	win_data = &ctx->win_data[win];
 	win_data->enabled = false;

 	/* TODO. */
 }

 static int vidi_power_on(struct vidi_context *ctx, bool enable)
 {
 	DRM_DEBUG_KMS("%s\n", __FILE__);

 	if (enable != false && enable != true)
 		return -EINVAL;

 	if (enable) {
 		ctx->suspended = false;

 		/* if vblank was enabled status, enable it again. */
 		if (test_and_clear_bit(0, &ctx->irq_flags))
 			vidi_enable_vblank(ctx->crtc);

 		vidi_apply(ctx);
 	} else {
 		ctx->suspended = true;
 	}

 	return 0;
 }

 static void vidi_dpms(struct exynos_drm_crtc *crtc, int mode)
 {
 	struct vidi_context *ctx = crtc->ctx;

 	DRM_DEBUG_KMS("%d\n", mode);

 	mutex_lock(&ctx->lock);

 	switch (mode) {
 	case DRM_MODE_DPMS_ON:
 		vidi_power_on(ctx, true);
 		break;
 	case DRM_MODE_DPMS_STANDBY:
 	case DRM_MODE_DPMS_SUSPEND:
 	case DRM_MODE_DPMS_OFF:
 		vidi_power_on(ctx, false);
 		break;
 	default:
 		DRM_DEBUG_KMS("unspecified mode %d\n", mode);
 		break;
 	}

 	mutex_unlock(&ctx->lock);
 }

 static int vidi_ctx_initialize(struct vidi_context *ctx,
 			struct drm_device *drm_dev)
 {
 	struct exynos_drm_private *priv = drm_dev->dev_private;

 	ctx->drm_dev = drm_dev;
 	ctx->pipe = priv->pipe++;

 	return 0;
 }

 static struct exynos_drm_crtc_ops vidi_crtc_ops = {
 	.dpms = vidi_dpms,
 	.enable_vblank = vidi_enable_vblank,
 	.disable_vblank = vidi_disable_vblank,
 	.win_mode_set = vidi_win_mode_set,
 	.win_commit = vidi_win_commit,
 	.win_disable = vidi_win_disable,
 };

 static void vidi_fake_vblank_handler(struct work_struct *work)
 {
 	struct vidi_context *ctx = container_of(work, struct vidi_context,
 					work);

 	if (ctx->pipe < 0)
 		return;

 	/* refresh rate is about 50Hz. */
 	usleep_range(16000, 20000);

 	mutex_lock(&ctx->lock);

 	if (ctx->direct_vblank) {
 		drm_handle_vblank(ctx->drm_dev, ctx->pipe);
 		ctx->direct_vblank = false;
 		mutex_unlock(&ctx->lock);
 		return;
 	}

 	mutex_unlock(&ctx->lock);

 	exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe);
 }

 static int 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 int 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_DEBUG_KMS("edid data is not fake data.\n");
 		return -EINVAL;
 	}

 	DRM_DEBUG_KMS("requested connection.\n");

 	drm_helper_hpd_irq_event(ctx->drm_dev);

 	return len;
 }

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

 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
 				struct drm_file *file_priv)
 {
 	struct vidi_context *ctx = NULL;
 	struct drm_encoder *encoder;
 	struct exynos_drm_display *display;
 	struct drm_exynos_vidi_connection *vidi = data;

 	if (!vidi) {
 		DRM_DEBUG_KMS("user data for vidi is null.\n");
 		return -EINVAL;
 	}

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

 	list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list,
 								head) {
 		display = exynos_drm_get_display(encoder);

 		if (display->type == EXYNOS_DISPLAY_TYPE_VIDI) {
 			ctx = display_to_vidi(display);
 			break;
 		}
 	}

 	if (!ctx) {
 		DRM_DEBUG_KMS("not found virtual device type encoder.\n");
 		return -EINVAL;
 	}

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

 	if (vidi->connection) {
 		struct edid *raw_edid  = (struct edid *)(uint32_t)vidi->edid;
 		if (!drm_edid_is_valid(raw_edid)) {
 			DRM_DEBUG_KMS("edid data is invalid.\n");
 			return -EINVAL;
 		}
 		ctx->raw_edid = drm_edid_duplicate(raw_edid);
 		if (!ctx->raw_edid) {
 			DRM_DEBUG_KMS("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 struct drm_connector_funcs vidi_connector_funcs = {
 	.dpms = drm_helper_connector_dpms,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.detect = vidi_detect,
 	.destroy = vidi_connector_destroy,
 };

 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_DEBUG_KMS("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_DEBUG_KMS("failed to allocate edid\n");
 		return -ENOMEM;
 	}

 	drm_mode_connector_update_edid_property(connector, edid);

 	return drm_add_edid_modes(connector, edid);
 }

 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector)
 {
 	struct vidi_context *ctx = ctx_from_connector(connector);

 	return ctx->encoder;
 }

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

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

 	ctx->encoder = encoder;
 	connector->polled = DRM_CONNECTOR_POLL_HPD;

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

 	drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
 	drm_connector_register(connector);
 	drm_mode_connector_attach_encoder(connector, encoder);

 	return 0;
 }


 static struct exynos_drm_display_ops vidi_display_ops = {
 	.create_connector = vidi_create_connector,
 };

 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;
 	int ret;

 	vidi_ctx_initialize(ctx, drm_dev);

 	ctx->crtc = exynos_drm_crtc_create(drm_dev, ctx->pipe,
 					   EXYNOS_DISPLAY_TYPE_VIDI,
 					   &vidi_crtc_ops, ctx);
 	if (IS_ERR(ctx->crtc)) {
 		DRM_ERROR("failed to create crtc.\n");
 		return PTR_ERR(ctx->crtc);
 	}

 	ret = exynos_drm_create_enc_conn(drm_dev, &ctx->display);
 	if (ret) {
 		ctx->crtc->base.funcs->destroy(&ctx->crtc->base);
 		return ret;
 	}

 	return 0;
 }


 static void vidi_unbind(struct device *dev, struct device *master, void *data)
 {
 }

 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;
 	int ret;

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

 	ctx->display.type = EXYNOS_DISPLAY_TYPE_VIDI;
 	ctx->display.ops = &vidi_display_ops;
 	ctx->default_win = 0;
 	ctx->pdev = pdev;

 	ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC,
 					EXYNOS_DISPLAY_TYPE_VIDI);
 	if (ret)
 		return ret;

 	ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR,
 					ctx->display.type);
 	if (ret)
 		goto err_del_crtc_component;

 	INIT_WORK(&ctx->work, vidi_fake_vblank_handler);

 	mutex_init(&ctx->lock);

 	platform_set_drvdata(pdev, ctx);

 	ret = device_create_file(&pdev->dev, &dev_attr_connection);
 	if (ret < 0) {
 		DRM_ERROR("failed to create connection sysfs.\n");
 		goto err_del_conn_component;
 	}

 	ret = component_add(&pdev->dev, &vidi_component_ops);
 	if (ret)
 		goto err_remove_file;

 	return ret;

 err_remove_file:
 	device_remove_file(&pdev->dev, &dev_attr_connection);
 err_del_conn_component:
 	exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
 err_del_crtc_component:
 	exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC);

 	return ret;
 }

 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);
 	exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
 	exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC);

 	return 0;
 }

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

 int exynos_drm_probe_vidi(void)
 {
 	struct platform_device *pdev;
 	int ret;

 	pdev = platform_device_register_simple("exynos-drm-vidi", -1, NULL, 0);
 	if (IS_ERR(pdev))
 		return PTR_ERR(pdev);

 	ret = platform_driver_register(&vidi_driver);
 	if (ret) {
 		platform_device_unregister(pdev);
 		return ret;
 	}

 	return ret;
 }

 static int exynos_drm_remove_vidi_device(struct device *dev, void *data)
 {
 	platform_device_unregister(to_platform_device(dev));

 	return 0;
 }

 void exynos_drm_remove_vidi(void)
 {
 	int ret = driver_for_each_device(&vidi_driver.driver, NULL, NULL,
 					 exynos_drm_remove_vidi_device);
 	/* silence compiler warning */
 	(void)ret;

 	platform_driver_unregister(&vidi_driver);
 }
	/* exynos_drm_vidi.c
	*
	* Copyright (C) 2012 Samsung Electronics Co.Ltd
	* Authors:
	* Inki Dae <inki.dae@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 <linux/kernel.h>
	#include <linux/platform_device.h>
	#include <linux/component.h>

	#include <drm/exynos_drm.h>

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

	#include "exynos_drm_drv.h"
	#include "exynos_drm_crtc.h"
	#include "exynos_drm_encoder.h"
	#include "exynos_drm_vidi.h"

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

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

	struct vidi_win_data {
	unsigned int offset_x;
	unsigned int offset_y;
	unsigned int ovl_width;
	unsigned int ovl_height;
	unsigned int fb_width;
	unsigned int fb_height;
	unsigned int bpp;
	dma_addr_t dma_addr;
	unsigned int buf_offsize;
	unsigned int line_size; /* bytes */
	bool enabled;
	};

	struct vidi_context {
	struct exynos_drm_display display;
	struct platform_device *pdev;
	struct drm_device *drm_dev;
	struct exynos_drm_crtc *crtc;
	struct drm_encoder *encoder;
	struct drm_connector connector;
	struct vidi_win_data win_data[WINDOWS_NR];
	struct edid *raw_edid;
	unsigned int clkdiv;
	unsigned int default_win;
	unsigned long irq_flags;
	unsigned int connected;
	bool vblank_on;
	bool suspended;
	bool direct_vblank;
	struct work_struct work;
	struct mutex lock;
	int pipe;
	};

	static inline struct vidi_context display_to_vidi(struct exynos_drm_display d)
	{
	return container_of(d, struct vidi_context, display);
	}

	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 void vidi_apply(struct vidi_context *ctx)
	{
	struct exynos_drm_crtc_ops *crtc_ops = ctx->crtc->ops;
	struct vidi_win_data *win_data;
	int i;

	for (i = 0; i < WINDOWS_NR; i++) {
	win_data = &ctx->win_data[i];
	if (win_data->enabled && (crtc_ops && crtc_ops->win_commit))
	crtc_ops->win_commit(ctx->crtc, i);
	}
	}

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

	if (ctx->suspended)
	return -EPERM;

	if (!test_and_set_bit(0, &ctx->irq_flags))
	ctx->vblank_on = true;

	ctx->direct_vblank = true;

	/*
	* in case of page flip request, vidi_finish_pageflip function
	* will not be called because direct_vblank is true and then
	* that function will be called by crtc_ops->win_commit callback
	*/
	schedule_work(&ctx->work);

	return 0;
	}

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

	if (ctx->suspended)
	return;

	if (test_and_clear_bit(0, &ctx->irq_flags))
	ctx->vblank_on = false;
	}

	static void vidi_win_mode_set(struct exynos_drm_crtc *crtc,
	struct exynos_drm_plane *plane)
	{
	struct vidi_context *ctx = crtc->ctx;
	struct vidi_win_data *win_data;
	int win;
	unsigned long offset;

	if (!plane) {
	DRM_ERROR("plane is NULL\n");
	return;
	}

	win = plane->zpos;
	if (win == DEFAULT_ZPOS)
	win = ctx->default_win;

	if (win < 0 \|\| win >= WINDOWS_NR)
	return;

	offset = plane->fb_x * (plane->bpp >> 3);
	offset += plane->fb_y * plane->pitch;

	DRM_DEBUG_KMS("offset = 0x%lx, pitch = %x\n", offset, plane->pitch);

	win_data = &ctx->win_data[win];

	win_data->offset_x = plane->crtc_x;
	win_data->offset_y = plane->crtc_y;
	win_data->ovl_width = plane->crtc_width;
	win_data->ovl_height = plane->crtc_height;
	win_data->fb_width = plane->fb_width;
	win_data->fb_height = plane->fb_height;
	win_data->dma_addr = plane->dma_addr[0] + offset;
	win_data->bpp = plane->bpp;
	win_data->buf_offsize = (plane->fb_width - plane->crtc_width) *
	(plane->bpp >> 3);
	win_data->line_size = plane->crtc_width * (plane->bpp >> 3);

	/*
	* some parts of win_data should be transferred to user side
	* through specific ioctl.
	*/

	DRM_DEBUG_KMS("offset_x = %d, offset_y = %d\n",
	win_data->offset_x, win_data->offset_y);
	DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n",
	win_data->ovl_width, win_data->ovl_height);
	DRM_DEBUG_KMS("paddr = 0x%lx\n", (unsigned long)win_data->dma_addr);
	DRM_DEBUG_KMS("fb_width = %d, crtc_width = %d\n",
	plane->fb_width, plane->crtc_width);
	}

	static void vidi_win_commit(struct exynos_drm_crtc *crtc, int zpos)
	{
	struct vidi_context *ctx = crtc->ctx;
	struct vidi_win_data *win_data;
	int win = zpos;

	if (ctx->suspended)
	return;

	if (win == DEFAULT_ZPOS)
	win = ctx->default_win;

	if (win < 0 \|\| win >= WINDOWS_NR)
	return;

	win_data = &ctx->win_data[win];

	win_data->enabled = true;

	DRM_DEBUG_KMS("dma_addr = %pad\n", &win_data->dma_addr);

	if (ctx->vblank_on)
	schedule_work(&ctx->work);
	}

	static void vidi_win_disable(struct exynos_drm_crtc *crtc, int zpos)
	{
	struct vidi_context *ctx = crtc->ctx;
	struct vidi_win_data *win_data;
	int win = zpos;

	if (win == DEFAULT_ZPOS)
	win = ctx->default_win;

	if (win < 0 \|\| win >= WINDOWS_NR)
	return;

	win_data = &ctx->win_data[win];
	win_data->enabled = false;

	/* TODO. */
	}

	static int vidi_power_on(struct vidi_context *ctx, bool enable)
	{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (enable != false && enable != true)
	return -EINVAL;

	if (enable) {
	ctx->suspended = false;

	/* if vblank was enabled status, enable it again. */
	if (test_and_clear_bit(0, &ctx->irq_flags))
	vidi_enable_vblank(ctx->crtc);

	vidi_apply(ctx);
	} else {
	ctx->suspended = true;
	}

	return 0;
	}

	static void vidi_dpms(struct exynos_drm_crtc *crtc, int mode)
	{
	struct vidi_context *ctx = crtc->ctx;

	DRM_DEBUG_KMS("%d\n", mode);

	mutex_lock(&ctx->lock);

	switch (mode) {
	case DRM_MODE_DPMS_ON:
	vidi_power_on(ctx, true);
	break;
	case DRM_MODE_DPMS_STANDBY:
	case DRM_MODE_DPMS_SUSPEND:
	case DRM_MODE_DPMS_OFF:
	vidi_power_on(ctx, false);
	break;
	default:
	DRM_DEBUG_KMS("unspecified mode %d\n", mode);
	break;
	}

	mutex_unlock(&ctx->lock);
	}

	static int vidi_ctx_initialize(struct vidi_context *ctx,
	struct drm_device *drm_dev)
	{
	struct exynos_drm_private *priv = drm_dev->dev_private;

	ctx->drm_dev = drm_dev;
	ctx->pipe = priv->pipe++;

	return 0;
	}

	static struct exynos_drm_crtc_ops vidi_crtc_ops = {
	.dpms = vidi_dpms,
	.enable_vblank = vidi_enable_vblank,
	.disable_vblank = vidi_disable_vblank,
	.win_mode_set = vidi_win_mode_set,
	.win_commit = vidi_win_commit,
	.win_disable = vidi_win_disable,
	};

	static void vidi_fake_vblank_handler(struct work_struct *work)
	{
	struct vidi_context *ctx = container_of(work, struct vidi_context,
	work);

	if (ctx->pipe < 0)
	return;

	/* refresh rate is about 50Hz. */
	usleep_range(16000, 20000);

	mutex_lock(&ctx->lock);

	if (ctx->direct_vblank) {
	drm_handle_vblank(ctx->drm_dev, ctx->pipe);
	ctx->direct_vblank = false;
	mutex_unlock(&ctx->lock);
	return;
	}

	mutex_unlock(&ctx->lock);

	exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe);
	}

	static int 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 int 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_DEBUG_KMS("edid data is not fake data.\n");
	return -EINVAL;
	}

	DRM_DEBUG_KMS("requested connection.\n");

	drm_helper_hpd_irq_event(ctx->drm_dev);

	return len;
	}

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

	int vidi_connection_ioctl(struct drm_device drm_dev, void data,
	struct drm_file *file_priv)
	{
	struct vidi_context *ctx = NULL;
	struct drm_encoder *encoder;
	struct exynos_drm_display *display;
	struct drm_exynos_vidi_connection *vidi = data;

	if (!vidi) {
	DRM_DEBUG_KMS("user data for vidi is null.\n");
	return -EINVAL;
	}

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

	list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list,
	head) {
	display = exynos_drm_get_display(encoder);

	if (display->type == EXYNOS_DISPLAY_TYPE_VIDI) {
	ctx = display_to_vidi(display);
	break;
	}
	}

	if (!ctx) {
	DRM_DEBUG_KMS("not found virtual device type encoder.\n");
	return -EINVAL;
	}

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

	if (vidi->connection) {
	struct edid raw_edid = (struct edid )(uint32_t)vidi->edid;
	if (!drm_edid_is_valid(raw_edid)) {
	DRM_DEBUG_KMS("edid data is invalid.\n");
	return -EINVAL;
	}
	ctx->raw_edid = drm_edid_duplicate(raw_edid);
	if (!ctx->raw_edid) {
	DRM_DEBUG_KMS("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 struct drm_connector_funcs vidi_connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = vidi_detect,
	.destroy = vidi_connector_destroy,
	};

	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_DEBUG_KMS("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_DEBUG_KMS("failed to allocate edid\n");
	return -ENOMEM;
	}

	drm_mode_connector_update_edid_property(connector, edid);

	return drm_add_edid_modes(connector, edid);
	}

	static struct drm_encoder vidi_best_encoder(struct drm_connector connector)
	{
	struct vidi_context *ctx = ctx_from_connector(connector);

	return ctx->encoder;
	}

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

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

	ctx->encoder = encoder;
	connector->polled = DRM_CONNECTOR_POLL_HPD;

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

	drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
	drm_connector_register(connector);
	drm_mode_connector_attach_encoder(connector, encoder);

	return 0;
	}


	static struct exynos_drm_display_ops vidi_display_ops = {
	.create_connector = vidi_create_connector,
	};

	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;
	int ret;

	vidi_ctx_initialize(ctx, drm_dev);

	ctx->crtc = exynos_drm_crtc_create(drm_dev, ctx->pipe,
	EXYNOS_DISPLAY_TYPE_VIDI,
	&vidi_crtc_ops, ctx);
	if (IS_ERR(ctx->crtc)) {
	DRM_ERROR("failed to create crtc.\n");
	return PTR_ERR(ctx->crtc);
	}

	ret = exynos_drm_create_enc_conn(drm_dev, &ctx->display);
	if (ret) {
	ctx->crtc->base.funcs->destroy(&ctx->crtc->base);
	return ret;
	}

	return 0;
	}


	static void vidi_unbind(struct device dev, struct device master, void *data)
	{
	}

	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;
	int ret;

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

	ctx->display.type = EXYNOS_DISPLAY_TYPE_VIDI;
	ctx->display.ops = &vidi_display_ops;
	ctx->default_win = 0;
	ctx->pdev = pdev;

	ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC,
	EXYNOS_DISPLAY_TYPE_VIDI);
	if (ret)
	return ret;

	ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR,
	ctx->display.type);
	if (ret)
	goto err_del_crtc_component;

	INIT_WORK(&ctx->work, vidi_fake_vblank_handler);

	mutex_init(&ctx->lock);

	platform_set_drvdata(pdev, ctx);

	ret = device_create_file(&pdev->dev, &dev_attr_connection);
	if (ret < 0) {
	DRM_ERROR("failed to create connection sysfs.\n");
	goto err_del_conn_component;
	}

	ret = component_add(&pdev->dev, &vidi_component_ops);
	if (ret)
	goto err_remove_file;

	return ret;

	err_remove_file:
	device_remove_file(&pdev->dev, &dev_attr_connection);
	err_del_conn_component:
	exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
	err_del_crtc_component:
	exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC);

	return ret;
	}

	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);
	exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
	exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC);

	return 0;
	}

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

	int exynos_drm_probe_vidi(void)
	{
	struct platform_device *pdev;
	int ret;

	pdev = platform_device_register_simple("exynos-drm-vidi", -1, NULL, 0);
	if (IS_ERR(pdev))
	return PTR_ERR(pdev);

	ret = platform_driver_register(&vidi_driver);
	if (ret) {
	platform_device_unregister(pdev);
	return ret;
	}

	return ret;
	}

	static int exynos_drm_remove_vidi_device(struct device dev, void data)
	{
	platform_device_unregister(to_platform_device(dev));

	return 0;
	}

	void exynos_drm_remove_vidi(void)
	{
	int ret = driver_for_each_device(&vidi_driver.driver, NULL, NULL,
	exynos_drm_remove_vidi_device);
	/* silence compiler warning */
	(void)ret;

	platform_driver_unregister(&vidi_driver);
	}