drivers/gpu/drm/rockchip/rockchip_drm_drv.c - kernel/msm-4.19 - Gitiles

 /*
  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
  * Author:Mark Yao <mark.yao@rock-chips.com>
  *
  * based on exynos_drm_drv.c
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <asm/dma-iommu.h>

 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <linux/dma-mapping.h>
 #include <linux/pm_runtime.h>
 #include <linux/module.h>
 #include <linux/of_graph.h>
 #include <linux/component.h>
 #include <linux/console.h>

 #include "rockchip_drm_drv.h"
 #include "rockchip_drm_fb.h"
 #include "rockchip_drm_fbdev.h"
 #include "rockchip_drm_gem.h"

 #define DRIVER_NAME	"rockchip"
 #define DRIVER_DESC	"RockChip Soc DRM"
 #define DRIVER_DATE	"20140818"
 #define DRIVER_MAJOR	1
 #define DRIVER_MINOR	0

 static bool is_support_iommu = true;
 static struct drm_driver rockchip_drm_driver;

 /*
  * Attach a (component) device to the shared drm dma mapping from master drm
  * device.  This is used by the VOPs to map GEM buffers to a common DMA
  * mapping.
  */
 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
 				   struct device *dev)
 {
 	struct dma_iommu_mapping *mapping = drm_dev->dev->archdata.mapping;
 	int ret;

 	if (!is_support_iommu)
 		return 0;

 	ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 	if (ret)
 		return ret;

 	dma_set_max_seg_size(dev, DMA_BIT_MASK(32));

 	return arm_iommu_attach_device(dev, mapping);
 }

 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
 				    struct device *dev)
 {
 	if (!is_support_iommu)
 		return;

 	arm_iommu_detach_device(dev);
 }

 int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
 				 const struct rockchip_crtc_funcs *crtc_funcs)
 {
 	int pipe = drm_crtc_index(crtc);
 	struct rockchip_drm_private *priv = crtc->dev->dev_private;

 	if (pipe >= ROCKCHIP_MAX_CRTC)
 		return -EINVAL;

 	priv->crtc_funcs[pipe] = crtc_funcs;

 	return 0;
 }

 void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc)
 {
 	int pipe = drm_crtc_index(crtc);
 	struct rockchip_drm_private *priv = crtc->dev->dev_private;

 	if (pipe >= ROCKCHIP_MAX_CRTC)
 		return;

 	priv->crtc_funcs[pipe] = NULL;
 }

 static struct drm_crtc *rockchip_crtc_from_pipe(struct drm_device *drm,
 						int pipe)
 {
 	struct drm_crtc *crtc;
 	int i = 0;

 	list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
 		if (i++ == pipe)
 			return crtc;

 	return NULL;
 }

 static int rockchip_drm_crtc_enable_vblank(struct drm_device *dev,
 					   unsigned int pipe)
 {
 	struct rockchip_drm_private *priv = dev->dev_private;
 	struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);

 	if (crtc && priv->crtc_funcs[pipe] &&
 	    priv->crtc_funcs[pipe]->enable_vblank)
 		return priv->crtc_funcs[pipe]->enable_vblank(crtc);

 	return 0;
 }

 static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev,
 					     unsigned int pipe)
 {
 	struct rockchip_drm_private *priv = dev->dev_private;
 	struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);

 	if (crtc && priv->crtc_funcs[pipe] &&
 	    priv->crtc_funcs[pipe]->enable_vblank)
 		priv->crtc_funcs[pipe]->disable_vblank(crtc);
 }

 static int rockchip_drm_bind(struct device *dev)
 {
 	struct drm_device *drm_dev;
 	struct rockchip_drm_private *private;
 	struct dma_iommu_mapping *mapping = NULL;
 	int ret;

 	drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
 	if (!drm_dev)
 		return -ENOMEM;

 	dev_set_drvdata(dev, drm_dev);

 	private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 	if (!private) {
 		ret = -ENOMEM;
 		goto err_free;
 	}

 	drm_dev->dev_private = private;

 	drm_mode_config_init(drm_dev);

 	rockchip_drm_mode_config_init(drm_dev);

 	dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
 				      GFP_KERNEL);
 	if (!dev->dma_parms) {
 		ret = -ENOMEM;
 		goto err_config_cleanup;
 	}

 	if (is_support_iommu) {
 		/* TODO(djkurtz): fetch the mapping start/size from somewhere */
 		mapping = arm_iommu_create_mapping(&platform_bus_type,
 						   0x00000000,
 						   SZ_2G);
 		if (IS_ERR(mapping)) {
 			ret = PTR_ERR(mapping);
 			goto err_config_cleanup;
 		}

 		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 		if (ret)
 			goto err_release_mapping;

 		dma_set_max_seg_size(dev, DMA_BIT_MASK(32));

 		ret = arm_iommu_attach_device(dev, mapping);
 		if (ret)
 			goto err_release_mapping;
 	}

 	/* Try to bind all sub drivers. */
 	ret = component_bind_all(dev, drm_dev);
 	if (ret)
 		goto err_detach_device;

 	/* init kms poll for handling hpd */
 	drm_kms_helper_poll_init(drm_dev);

 	/*
 	 * enable drm irq mode.
 	 * - with irq_enabled = true, we can use the vblank feature.
 	 */
 	drm_dev->irq_enabled = true;

 	ret = drm_vblank_init(drm_dev, ROCKCHIP_MAX_CRTC);
 	if (ret)
 		goto err_kms_helper_poll_fini;

 	drm_mode_config_reset(drm_dev);

 	ret = rockchip_drm_fbdev_init(drm_dev);
 	if (ret)
 		goto err_vblank_cleanup;

 	ret = drm_dev_register(drm_dev, 0);
 	if (ret)
 		goto err_fbdev_fini;

 	if (is_support_iommu)
 		arm_iommu_release_mapping(mapping);
 	return 0;
 err_fbdev_fini:
 	rockchip_drm_fbdev_fini(drm_dev);
 err_vblank_cleanup:
 	drm_vblank_cleanup(drm_dev);
 err_kms_helper_poll_fini:
 	drm_kms_helper_poll_fini(drm_dev);
 	component_unbind_all(dev, drm_dev);
 err_detach_device:
 	if (is_support_iommu)
 		arm_iommu_detach_device(dev);
 err_release_mapping:
 	if (is_support_iommu)
 		arm_iommu_release_mapping(mapping);
 err_config_cleanup:
 	drm_mode_config_cleanup(drm_dev);
 	drm_dev->dev_private = NULL;
 err_free:
 	drm_dev_unref(drm_dev);
 	return ret;
 }

 static void rockchip_drm_unbind(struct device *dev)
 {
 	struct drm_device *drm_dev = dev_get_drvdata(dev);

 	rockchip_drm_fbdev_fini(drm_dev);
 	drm_vblank_cleanup(drm_dev);
 	drm_kms_helper_poll_fini(drm_dev);
 	component_unbind_all(dev, drm_dev);
 	if (is_support_iommu)
 		arm_iommu_detach_device(dev);
 	drm_mode_config_cleanup(drm_dev);
 	drm_dev->dev_private = NULL;
 	drm_dev_unregister(drm_dev);
 	drm_dev_unref(drm_dev);
 	dev_set_drvdata(dev, NULL);
 }

 static void rockchip_drm_lastclose(struct drm_device *dev)
 {
 	struct rockchip_drm_private *priv = dev->dev_private;

 	drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
 }

 static const struct file_operations rockchip_drm_driver_fops = {
 	.owner = THIS_MODULE,
 	.open = drm_open,
 	.mmap = rockchip_gem_mmap,
 	.poll = drm_poll,
 	.read = drm_read,
 	.unlocked_ioctl = drm_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = drm_compat_ioctl,
 #endif
 	.release = drm_release,
 };

 static struct drm_driver rockchip_drm_driver = {
 	.driver_features	= DRIVER_MODESET | DRIVER_GEM |
 				  DRIVER_PRIME | DRIVER_ATOMIC,
 	.lastclose		= rockchip_drm_lastclose,
 	.get_vblank_counter	= drm_vblank_no_hw_counter,
 	.enable_vblank		= rockchip_drm_crtc_enable_vblank,
 	.disable_vblank		= rockchip_drm_crtc_disable_vblank,
 	.gem_vm_ops		= &drm_gem_cma_vm_ops,
 	.gem_free_object_unlocked = rockchip_gem_free_object,
 	.dumb_create		= rockchip_gem_dumb_create,
 	.dumb_map_offset	= rockchip_gem_dumb_map_offset,
 	.dumb_destroy		= drm_gem_dumb_destroy,
 	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
 	.gem_prime_import	= drm_gem_prime_import,
 	.gem_prime_export	= drm_gem_prime_export,
 	.gem_prime_get_sg_table	= rockchip_gem_prime_get_sg_table,
 	.gem_prime_vmap		= rockchip_gem_prime_vmap,
 	.gem_prime_vunmap	= rockchip_gem_prime_vunmap,
 	.gem_prime_mmap		= rockchip_gem_mmap_buf,
 	.fops			= &rockchip_drm_driver_fops,
 	.name	= DRIVER_NAME,
 	.desc	= DRIVER_DESC,
 	.date	= DRIVER_DATE,
 	.major	= DRIVER_MAJOR,
 	.minor	= DRIVER_MINOR,
 };

 #ifdef CONFIG_PM_SLEEP
 void rockchip_drm_fb_suspend(struct drm_device *drm)
 {
 	struct rockchip_drm_private *priv = drm->dev_private;

 	console_lock();
 	drm_fb_helper_set_suspend(&priv->fbdev_helper, 1);
 	console_unlock();
 }

 void rockchip_drm_fb_resume(struct drm_device *drm)
 {
 	struct rockchip_drm_private *priv = drm->dev_private;

 	console_lock();
 	drm_fb_helper_set_suspend(&priv->fbdev_helper, 0);
 	console_unlock();
 }

 static int rockchip_drm_sys_suspend(struct device *dev)
 {
 	struct drm_device *drm = dev_get_drvdata(dev);
 	struct rockchip_drm_private *priv = drm->dev_private;

 	drm_kms_helper_poll_disable(drm);
 	rockchip_drm_fb_suspend(drm);

 	priv->state = drm_atomic_helper_suspend(drm);
 	if (IS_ERR(priv->state)) {
 		rockchip_drm_fb_resume(drm);
 		drm_kms_helper_poll_enable(drm);
 		return PTR_ERR(priv->state);
 	}

 	return 0;
 }

 static int rockchip_drm_sys_resume(struct device *dev)
 {
 	struct drm_device *drm = dev_get_drvdata(dev);
 	struct rockchip_drm_private *priv = drm->dev_private;

 	drm_atomic_helper_resume(drm, priv->state);
 	rockchip_drm_fb_resume(drm);
 	drm_kms_helper_poll_enable(drm);

 	return 0;
 }
 #endif

 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 				rockchip_drm_sys_resume)
 };

 static int compare_of(struct device *dev, void *data)
 {
 	struct device_node *np = data;

 	return dev->of_node == np;
 }

 static void rockchip_add_endpoints(struct device *dev,
 				   struct component_match **match,
 				   struct device_node *port)
 {
 	struct device_node *ep, *remote;

 	for_each_child_of_node(port, ep) {
 		remote = of_graph_get_remote_port_parent(ep);
 		if (!remote || !of_device_is_available(remote)) {
 			of_node_put(remote);
 			continue;
 		} else if (!of_device_is_available(remote->parent)) {
 			dev_warn(dev, "parent device of %s is not available\n",
 				 remote->full_name);
 			of_node_put(remote);
 			continue;
 		}

 		component_match_add(dev, match, compare_of, remote);
 		of_node_put(remote);
 	}
 }

 static const struct component_master_ops rockchip_drm_ops = {
 	.bind = rockchip_drm_bind,
 	.unbind = rockchip_drm_unbind,
 };

 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct component_match *match = NULL;
 	struct device_node *np = dev->of_node;
 	struct device_node *port;
 	int i;

 	if (!np)
 		return -ENODEV;
 	/*
 	 * Bind the crtc ports first, so that
 	 * drm_of_find_possible_crtcs called from encoder .bind callbacks
 	 * works as expected.
 	 */
 	for (i = 0;; i++) {
 		struct device_node *iommu;

 		port = of_parse_phandle(np, "ports", i);
 		if (!port)
 			break;

 		if (!of_device_is_available(port->parent)) {
 			of_node_put(port);
 			continue;
 		}

 		iommu = of_parse_phandle(port->parent, "iommus", 0);
 		if (!iommu || !of_device_is_available(iommu->parent)) {
 			dev_dbg(dev, "no iommu attached for %s, using non-iommu buffers\n",
 				port->parent->full_name);
 			/*
 			 * if there is a crtc not support iommu, force set all
 			 * crtc use non-iommu buffer.
 			 */
 			is_support_iommu = false;
 		}

 		of_node_put(iommu);
 		component_match_add(dev, &match, compare_of, port->parent);
 		of_node_put(port);
 	}

 	if (i == 0) {
 		dev_err(dev, "missing 'ports' property\n");
 		return -ENODEV;
 	}

 	if (!match) {
 		dev_err(dev, "No available vop found for display-subsystem.\n");
 		return -ENODEV;
 	}
 	/*
 	 * For each bound crtc, bind the encoders attached to its
 	 * remote endpoint.
 	 */
 	for (i = 0;; i++) {
 		port = of_parse_phandle(np, "ports", i);
 		if (!port)
 			break;

 		if (!of_device_is_available(port->parent)) {
 			of_node_put(port);
 			continue;
 		}

 		rockchip_add_endpoints(dev, &match, port);
 		of_node_put(port);
 	}

 	return component_master_add_with_match(dev, &rockchip_drm_ops, match);
 }

 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 {
 	component_master_del(&pdev->dev, &rockchip_drm_ops);

 	return 0;
 }

 static const struct of_device_id rockchip_drm_dt_ids[] = {
 	{ .compatible = "rockchip,display-subsystem", },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);

 static struct platform_driver rockchip_drm_platform_driver = {
 	.probe = rockchip_drm_platform_probe,
 	.remove = rockchip_drm_platform_remove,
 	.driver = {
 		.name = "rockchip-drm",
 		.of_match_table = rockchip_drm_dt_ids,
 		.pm = &rockchip_drm_pm_ops,
 	},
 };

 module_platform_driver(rockchip_drm_platform_driver);

 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
	* Author:Mark Yao <mark.yao@rock-chips.com>
	*
	* based on exynos_drm_drv.c
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <asm/dma-iommu.h>

	#include <drm/drmP.h>
	#include <drm/drm_crtc_helper.h>
	#include <drm/drm_fb_helper.h>
	#include <drm/drm_gem_cma_helper.h>
	#include <linux/dma-mapping.h>
	#include <linux/pm_runtime.h>
	#include <linux/module.h>
	#include <linux/of_graph.h>
	#include <linux/component.h>
	#include <linux/console.h>

	#include "rockchip_drm_drv.h"
	#include "rockchip_drm_fb.h"
	#include "rockchip_drm_fbdev.h"
	#include "rockchip_drm_gem.h"

	#define DRIVER_NAME "rockchip"
	#define DRIVER_DESC "RockChip Soc DRM"
	#define DRIVER_DATE "20140818"
	#define DRIVER_MAJOR 1
	#define DRIVER_MINOR 0

	static bool is_support_iommu = true;
	static struct drm_driver rockchip_drm_driver;

	/*
	* Attach a (component) device to the shared drm dma mapping from master drm
	* device. This is used by the VOPs to map GEM buffers to a common DMA
	* mapping.
	*/
	int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
	struct device *dev)
	{
	struct dma_iommu_mapping *mapping = drm_dev->dev->archdata.mapping;
	int ret;

	if (!is_support_iommu)
	return 0;

	ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
	if (ret)
	return ret;

	dma_set_max_seg_size(dev, DMA_BIT_MASK(32));

	return arm_iommu_attach_device(dev, mapping);
	}

	void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
	struct device *dev)
	{
	if (!is_support_iommu)
	return;

	arm_iommu_detach_device(dev);
	}

	int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
	const struct rockchip_crtc_funcs *crtc_funcs)
	{
	int pipe = drm_crtc_index(crtc);
	struct rockchip_drm_private *priv = crtc->dev->dev_private;

	if (pipe >= ROCKCHIP_MAX_CRTC)
	return -EINVAL;

	priv->crtc_funcs[pipe] = crtc_funcs;

	return 0;
	}

	void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc)
	{
	int pipe = drm_crtc_index(crtc);
	struct rockchip_drm_private *priv = crtc->dev->dev_private;

	if (pipe >= ROCKCHIP_MAX_CRTC)
	return;

	priv->crtc_funcs[pipe] = NULL;
	}

	static struct drm_crtc rockchip_crtc_from_pipe(struct drm_device drm,
	int pipe)
	{
	struct drm_crtc *crtc;
	int i = 0;

	list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
	if (i++ == pipe)
	return crtc;

	return NULL;
	}

	static int rockchip_drm_crtc_enable_vblank(struct drm_device *dev,
	unsigned int pipe)
	{
	struct rockchip_drm_private *priv = dev->dev_private;
	struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);

	if (crtc && priv->crtc_funcs[pipe] &&
	priv->crtc_funcs[pipe]->enable_vblank)
	return priv->crtc_funcs[pipe]->enable_vblank(crtc);

	return 0;
	}

	static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev,
	unsigned int pipe)
	{
	struct rockchip_drm_private *priv = dev->dev_private;
	struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);

	if (crtc && priv->crtc_funcs[pipe] &&
	priv->crtc_funcs[pipe]->enable_vblank)
	priv->crtc_funcs[pipe]->disable_vblank(crtc);
	}

	static int rockchip_drm_bind(struct device *dev)
	{
	struct drm_device *drm_dev;
	struct rockchip_drm_private *private;
	struct dma_iommu_mapping *mapping = NULL;
	int ret;

	drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
	if (!drm_dev)
	return -ENOMEM;

	dev_set_drvdata(dev, drm_dev);

	private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
	if (!private) {
	ret = -ENOMEM;
	goto err_free;
	}

	drm_dev->dev_private = private;

	drm_mode_config_init(drm_dev);

	rockchip_drm_mode_config_init(drm_dev);

	dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
	GFP_KERNEL);
	if (!dev->dma_parms) {
	ret = -ENOMEM;
	goto err_config_cleanup;
	}

	if (is_support_iommu) {
	/* TODO(djkurtz): fetch the mapping start/size from somewhere */
	mapping = arm_iommu_create_mapping(&platform_bus_type,
	0x00000000,
	SZ_2G);
	if (IS_ERR(mapping)) {
	ret = PTR_ERR(mapping);
	goto err_config_cleanup;
	}

	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
	if (ret)
	goto err_release_mapping;

	dma_set_max_seg_size(dev, DMA_BIT_MASK(32));

	ret = arm_iommu_attach_device(dev, mapping);
	if (ret)
	goto err_release_mapping;
	}

	/* Try to bind all sub drivers. */
	ret = component_bind_all(dev, drm_dev);
	if (ret)
	goto err_detach_device;

	/* init kms poll for handling hpd */
	drm_kms_helper_poll_init(drm_dev);

	/*
	* enable drm irq mode.
	* - with irq_enabled = true, we can use the vblank feature.
	*/
	drm_dev->irq_enabled = true;

	ret = drm_vblank_init(drm_dev, ROCKCHIP_MAX_CRTC);
	if (ret)
	goto err_kms_helper_poll_fini;

	drm_mode_config_reset(drm_dev);

	ret = rockchip_drm_fbdev_init(drm_dev);
	if (ret)
	goto err_vblank_cleanup;

	ret = drm_dev_register(drm_dev, 0);
	if (ret)
	goto err_fbdev_fini;

	if (is_support_iommu)
	arm_iommu_release_mapping(mapping);
	return 0;
	err_fbdev_fini:
	rockchip_drm_fbdev_fini(drm_dev);
	err_vblank_cleanup:
	drm_vblank_cleanup(drm_dev);
	err_kms_helper_poll_fini:
	drm_kms_helper_poll_fini(drm_dev);
	component_unbind_all(dev, drm_dev);
	err_detach_device:
	if (is_support_iommu)
	arm_iommu_detach_device(dev);
	err_release_mapping:
	if (is_support_iommu)
	arm_iommu_release_mapping(mapping);
	err_config_cleanup:
	drm_mode_config_cleanup(drm_dev);
	drm_dev->dev_private = NULL;
	err_free:
	drm_dev_unref(drm_dev);
	return ret;
	}

	static void rockchip_drm_unbind(struct device *dev)
	{
	struct drm_device *drm_dev = dev_get_drvdata(dev);

	rockchip_drm_fbdev_fini(drm_dev);
	drm_vblank_cleanup(drm_dev);
	drm_kms_helper_poll_fini(drm_dev);
	component_unbind_all(dev, drm_dev);
	if (is_support_iommu)
	arm_iommu_detach_device(dev);
	drm_mode_config_cleanup(drm_dev);
	drm_dev->dev_private = NULL;
	drm_dev_unregister(drm_dev);
	drm_dev_unref(drm_dev);
	dev_set_drvdata(dev, NULL);
	}

	static void rockchip_drm_lastclose(struct drm_device *dev)
	{
	struct rockchip_drm_private *priv = dev->dev_private;

	drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
	}

	static const struct file_operations rockchip_drm_driver_fops = {
	.owner = THIS_MODULE,
	.open = drm_open,
	.mmap = rockchip_gem_mmap,
	.poll = drm_poll,
	.read = drm_read,
	.unlocked_ioctl = drm_ioctl,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = drm_compat_ioctl,
	#endif
	.release = drm_release,
	};

	static struct drm_driver rockchip_drm_driver = {
	.driver_features = DRIVER_MODESET \| DRIVER_GEM \|
	DRIVER_PRIME \| DRIVER_ATOMIC,
	.lastclose = rockchip_drm_lastclose,
	.get_vblank_counter = drm_vblank_no_hw_counter,
	.enable_vblank = rockchip_drm_crtc_enable_vblank,
	.disable_vblank = rockchip_drm_crtc_disable_vblank,
	.gem_vm_ops = &drm_gem_cma_vm_ops,
	.gem_free_object_unlocked = rockchip_gem_free_object,
	.dumb_create = rockchip_gem_dumb_create,
	.dumb_map_offset = rockchip_gem_dumb_map_offset,
	.dumb_destroy = drm_gem_dumb_destroy,
	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
	.gem_prime_import = drm_gem_prime_import,
	.gem_prime_export = drm_gem_prime_export,
	.gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
	.gem_prime_vmap = rockchip_gem_prime_vmap,
	.gem_prime_vunmap = rockchip_gem_prime_vunmap,
	.gem_prime_mmap = rockchip_gem_mmap_buf,
	.fops = &rockchip_drm_driver_fops,
	.name = DRIVER_NAME,
	.desc = DRIVER_DESC,
	.date = DRIVER_DATE,
	.major = DRIVER_MAJOR,
	.minor = DRIVER_MINOR,
	};

	#ifdef CONFIG_PM_SLEEP
	void rockchip_drm_fb_suspend(struct drm_device *drm)
	{
	struct rockchip_drm_private *priv = drm->dev_private;

	console_lock();
	drm_fb_helper_set_suspend(&priv->fbdev_helper, 1);
	console_unlock();
	}

	void rockchip_drm_fb_resume(struct drm_device *drm)
	{
	struct rockchip_drm_private *priv = drm->dev_private;

	console_lock();
	drm_fb_helper_set_suspend(&priv->fbdev_helper, 0);
	console_unlock();
	}

	static int rockchip_drm_sys_suspend(struct device *dev)
	{
	struct drm_device *drm = dev_get_drvdata(dev);
	struct rockchip_drm_private *priv = drm->dev_private;

	drm_kms_helper_poll_disable(drm);
	rockchip_drm_fb_suspend(drm);

	priv->state = drm_atomic_helper_suspend(drm);
	if (IS_ERR(priv->state)) {
	rockchip_drm_fb_resume(drm);
	drm_kms_helper_poll_enable(drm);
	return PTR_ERR(priv->state);
	}

	return 0;
	}

	static int rockchip_drm_sys_resume(struct device *dev)
	{
	struct drm_device *drm = dev_get_drvdata(dev);
	struct rockchip_drm_private *priv = drm->dev_private;

	drm_atomic_helper_resume(drm, priv->state);
	rockchip_drm_fb_resume(drm);
	drm_kms_helper_poll_enable(drm);

	return 0;
	}
	#endif

	static const struct dev_pm_ops rockchip_drm_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
	rockchip_drm_sys_resume)
	};

	static int compare_of(struct device dev, void data)
	{
	struct device_node *np = data;

	return dev->of_node == np;
	}

	static void rockchip_add_endpoints(struct device *dev,
	struct component_match **match,
	struct device_node *port)
	{
	struct device_node ep, remote;

	for_each_child_of_node(port, ep) {
	remote = of_graph_get_remote_port_parent(ep);
	if (!remote \|\| !of_device_is_available(remote)) {
	of_node_put(remote);
	continue;
	} else if (!of_device_is_available(remote->parent)) {
	dev_warn(dev, "parent device of %s is not available\n",
	remote->full_name);
	of_node_put(remote);
	continue;
	}

	component_match_add(dev, match, compare_of, remote);
	of_node_put(remote);
	}
	}

	static const struct component_master_ops rockchip_drm_ops = {
	.bind = rockchip_drm_bind,
	.unbind = rockchip_drm_unbind,
	};

	static int rockchip_drm_platform_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct component_match *match = NULL;
	struct device_node *np = dev->of_node;
	struct device_node *port;
	int i;

	if (!np)
	return -ENODEV;
	/*
	* Bind the crtc ports first, so that
	* drm_of_find_possible_crtcs called from encoder .bind callbacks
	* works as expected.
	*/
	for (i = 0;; i++) {
	struct device_node *iommu;

	port = of_parse_phandle(np, "ports", i);
	if (!port)
	break;

	if (!of_device_is_available(port->parent)) {
	of_node_put(port);
	continue;
	}

	iommu = of_parse_phandle(port->parent, "iommus", 0);
	if (!iommu \|\| !of_device_is_available(iommu->parent)) {
	dev_dbg(dev, "no iommu attached for %s, using non-iommu buffers\n",
	port->parent->full_name);
	/*
	* if there is a crtc not support iommu, force set all
	* crtc use non-iommu buffer.
	*/
	is_support_iommu = false;
	}

	of_node_put(iommu);
	component_match_add(dev, &match, compare_of, port->parent);
	of_node_put(port);
	}

	if (i == 0) {
	dev_err(dev, "missing 'ports' property\n");
	return -ENODEV;
	}

	if (!match) {
	dev_err(dev, "No available vop found for display-subsystem.\n");
	return -ENODEV;
	}
	/*
	* For each bound crtc, bind the encoders attached to its
	* remote endpoint.
	*/
	for (i = 0;; i++) {
	port = of_parse_phandle(np, "ports", i);
	if (!port)
	break;

	if (!of_device_is_available(port->parent)) {
	of_node_put(port);
	continue;
	}

	rockchip_add_endpoints(dev, &match, port);
	of_node_put(port);
	}

	return component_master_add_with_match(dev, &rockchip_drm_ops, match);
	}

	static int rockchip_drm_platform_remove(struct platform_device *pdev)
	{
	component_master_del(&pdev->dev, &rockchip_drm_ops);

	return 0;
	}

	static const struct of_device_id rockchip_drm_dt_ids[] = {
	{ .compatible = "rockchip,display-subsystem", },
	{ /* sentinel */ },
	};
	MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);

	static struct platform_driver rockchip_drm_platform_driver = {
	.probe = rockchip_drm_platform_probe,
	.remove = rockchip_drm_platform_remove,
	.driver = {
	.name = "rockchip-drm",
	.of_match_table = rockchip_drm_dt_ids,
	.pm = &rockchip_drm_pm_ops,
	},
	};

	module_platform_driver(rockchip_drm_platform_driver);

	MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
	MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
	MODULE_LICENSE("GPL v2");