drivers/gpu/drm/sti/sti_drv.c - kernel/quantenna - Git at Google

 /*
  * Copyright (C) STMicroelectronics SA 2014
  * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
  * License terms:  GNU General Public License (GPL), version 2
  */

 #include <drm/drmP.h>

 #include <linux/component.h>
 #include <linux/debugfs.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_platform.h>

 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_fb_cma_helper.h>

 #include "sti_crtc.h"
 #include "sti_drv.h"
 #include "sti_plane.h"

 #define DRIVER_NAME	"sti"
 #define DRIVER_DESC	"STMicroelectronics SoC DRM"
 #define DRIVER_DATE	"20140601"
 #define DRIVER_MAJOR	1
 #define DRIVER_MINOR	0

 #define STI_MAX_FB_HEIGHT	4096
 #define STI_MAX_FB_WIDTH	4096

 static int sti_drm_fps_get(void *data, u64 *val)
 {
 	struct drm_device *drm_dev = data;
 	struct drm_plane *p;
 	unsigned int i = 0;

 	*val = 0;
 	list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
 		struct sti_plane *plane = to_sti_plane(p);

 		*val |= plane->fps_info.output << i;
 		i++;
 	}

 	return 0;
 }

 static int sti_drm_fps_set(void *data, u64 val)
 {
 	struct drm_device *drm_dev = data;
 	struct drm_plane *p;
 	unsigned int i = 0;

 	list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
 		struct sti_plane *plane = to_sti_plane(p);

 		plane->fps_info.output = (val >> i) & 1;
 		i++;
 	}

 	return 0;
 }

 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops,
 			sti_drm_fps_get, sti_drm_fps_set, "%llu\n");

 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data)
 {
 	struct drm_info_node *node = s->private;
 	struct drm_device *dev = node->minor->dev;
 	struct drm_plane *p;
 	int ret;

 	ret = mutex_lock_interruptible(&dev->struct_mutex);
 	if (ret)
 		return ret;

 	list_for_each_entry(p, &dev->mode_config.plane_list, head) {
 		struct sti_plane *plane = to_sti_plane(p);

 		seq_printf(s, "%s%s\n",
 			   plane->fps_info.fps_str,
 			   plane->fps_info.fips_str);
 	}

 	mutex_unlock(&dev->struct_mutex);
 	return 0;
 }

 static struct drm_info_list sti_drm_dbg_list[] = {
 	{"fps_get", sti_drm_fps_dbg_show, 0},
 };

 static int sti_drm_debugfs_create(struct dentry *root,
 				  struct drm_minor *minor,
 				  const char *name,
 				  const struct file_operations *fops)
 {
 	struct drm_device *dev = minor->dev;
 	struct drm_info_node *node;
 	struct dentry *ent;

 	ent = debugfs_create_file(name, S_IRUGO | S_IWUSR, root, dev, fops);
 	if (IS_ERR(ent))
 		return PTR_ERR(ent);

 	node = kmalloc(sizeof(*node), GFP_KERNEL);
 	if (!node) {
 		debugfs_remove(ent);
 		return -ENOMEM;
 	}

 	node->minor = minor;
 	node->dent = ent;
 	node->info_ent = (void *)fops;

 	mutex_lock(&minor->debugfs_lock);
 	list_add(&node->list, &minor->debugfs_list);
 	mutex_unlock(&minor->debugfs_lock);

 	return 0;
 }

 static int sti_drm_dbg_init(struct drm_minor *minor)
 {
 	int ret;

 	ret = drm_debugfs_create_files(sti_drm_dbg_list,
 				       ARRAY_SIZE(sti_drm_dbg_list),
 				       minor->debugfs_root, minor);
 	if (ret)
 		goto err;

 	ret = sti_drm_debugfs_create(minor->debugfs_root, minor, "fps_show",
 				     &sti_drm_fps_fops);
 	if (ret)
 		goto err;

 	DRM_INFO("%s: debugfs installed\n", DRIVER_NAME);
 	return 0;
 err:
 	DRM_ERROR("%s: cannot install debugfs\n", DRIVER_NAME);
 	return ret;
 }

 void sti_drm_dbg_cleanup(struct drm_minor *minor)
 {
 	drm_debugfs_remove_files(sti_drm_dbg_list,
 				 ARRAY_SIZE(sti_drm_dbg_list), minor);

 	drm_debugfs_remove_files((struct drm_info_list *)&sti_drm_fps_fops,
 				 1, minor);
 }

 static void sti_atomic_schedule(struct sti_private *private,
 				struct drm_atomic_state *state)
 {
 	private->commit.state = state;
 	schedule_work(&private->commit.work);
 }

 static void sti_atomic_complete(struct sti_private *private,
 				struct drm_atomic_state *state)
 {
 	struct drm_device *drm = private->drm_dev;

 	/*
 	 * Everything below can be run asynchronously without the need to grab
 	 * any modeset locks at all under one condition: It must be guaranteed
 	 * that the asynchronous work has either been cancelled (if the driver
 	 * supports it, which at least requires that the framebuffers get
 	 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
 	 * before the new state gets committed on the software side with
 	 * drm_atomic_helper_swap_state().
 	 *
 	 * This scheme allows new atomic state updates to be prepared and
 	 * checked in parallel to the asynchronous completion of the previous
 	 * update. Which is important since compositors need to figure out the
 	 * composition of the next frame right after having submitted the
 	 * current layout.
 	 */

 	drm_atomic_helper_commit_modeset_disables(drm, state);
 	drm_atomic_helper_commit_planes(drm, state, false);
 	drm_atomic_helper_commit_modeset_enables(drm, state);

 	drm_atomic_helper_wait_for_vblanks(drm, state);

 	drm_atomic_helper_cleanup_planes(drm, state);
 	drm_atomic_state_free(state);
 }

 static void sti_atomic_work(struct work_struct *work)
 {
 	struct sti_private *private = container_of(work,
 			struct sti_private, commit.work);

 	sti_atomic_complete(private, private->commit.state);
 }

 static int sti_atomic_commit(struct drm_device *drm,
 			     struct drm_atomic_state *state, bool nonblock)
 {
 	struct sti_private *private = drm->dev_private;
 	int err;

 	err = drm_atomic_helper_prepare_planes(drm, state);
 	if (err)
 		return err;

 	/* serialize outstanding nonblocking commits */
 	mutex_lock(&private->commit.lock);
 	flush_work(&private->commit.work);

 	/*
 	 * This is the point of no return - everything below never fails except
 	 * when the hw goes bonghits. Which means we can commit the new state on
 	 * the software side now.
 	 */

 	drm_atomic_helper_swap_state(drm, state);

 	if (nonblock)
 		sti_atomic_schedule(private, state);
 	else
 		sti_atomic_complete(private, state);

 	mutex_unlock(&private->commit.lock);
 	return 0;
 }

 static const struct drm_mode_config_funcs sti_mode_config_funcs = {
 	.fb_create = drm_fb_cma_create,
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = sti_atomic_commit,
 };

 static void sti_mode_config_init(struct drm_device *dev)
 {
 	dev->mode_config.min_width = 0;
 	dev->mode_config.min_height = 0;

 	/*
 	 * set max width and height as default value.
 	 * this value would be used to check framebuffer size limitation
 	 * at drm_mode_addfb().
 	 */
 	dev->mode_config.max_width = STI_MAX_FB_WIDTH;
 	dev->mode_config.max_height = STI_MAX_FB_HEIGHT;

 	dev->mode_config.funcs = &sti_mode_config_funcs;
 }

 static int sti_load(struct drm_device *dev, unsigned long flags)
 {
 	struct sti_private *private;
 	int ret;

 	private = kzalloc(sizeof(*private), GFP_KERNEL);
 	if (!private) {
 		DRM_ERROR("Failed to allocate private\n");
 		return -ENOMEM;
 	}
 	dev->dev_private = (void *)private;
 	private->drm_dev = dev;

 	mutex_init(&private->commit.lock);
 	INIT_WORK(&private->commit.work, sti_atomic_work);

 	drm_mode_config_init(dev);
 	drm_kms_helper_poll_init(dev);

 	sti_mode_config_init(dev);

 	ret = component_bind_all(dev->dev, dev);
 	if (ret) {
 		drm_kms_helper_poll_fini(dev);
 		drm_mode_config_cleanup(dev);
 		kfree(private);
 		return ret;
 	}

 	drm_mode_config_reset(dev);

 	drm_helper_disable_unused_functions(dev);
 	drm_fbdev_cma_init(dev, 32,
 			   dev->mode_config.num_crtc,
 			   dev->mode_config.num_connector);

 	return 0;
 }

 static const struct file_operations sti_driver_fops = {
 	.owner = THIS_MODULE,
 	.open = drm_open,
 	.mmap = drm_gem_cma_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 sti_driver = {
 	.driver_features = DRIVER_HAVE_IRQ | DRIVER_MODESET |
 	    DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
 	.load = sti_load,
 	.gem_free_object = drm_gem_cma_free_object,
 	.gem_vm_ops = &drm_gem_cma_vm_ops,
 	.dumb_create = drm_gem_cma_dumb_create,
 	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
 	.dumb_destroy = drm_gem_dumb_destroy,
 	.fops = &sti_driver_fops,

 	.get_vblank_counter = drm_vblank_no_hw_counter,
 	.enable_vblank = sti_crtc_enable_vblank,
 	.disable_vblank = sti_crtc_disable_vblank,

 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 	.gem_prime_export = drm_gem_prime_export,
 	.gem_prime_import = drm_gem_prime_import,
 	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 	.gem_prime_vmap = drm_gem_cma_prime_vmap,
 	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 	.gem_prime_mmap = drm_gem_cma_prime_mmap,

 	.debugfs_init = sti_drm_dbg_init,
 	.debugfs_cleanup = sti_drm_dbg_cleanup,

 	.name = DRIVER_NAME,
 	.desc = DRIVER_DESC,
 	.date = DRIVER_DATE,
 	.major = DRIVER_MAJOR,
 	.minor = DRIVER_MINOR,
 };

 static int compare_of(struct device *dev, void *data)
 {
 	return dev->of_node == data;
 }

 static int sti_bind(struct device *dev)
 {
 	return drm_platform_init(&sti_driver, to_platform_device(dev));
 }

 static void sti_unbind(struct device *dev)
 {
 	drm_put_dev(dev_get_drvdata(dev));
 }

 static const struct component_master_ops sti_ops = {
 	.bind = sti_bind,
 	.unbind = sti_unbind,
 };

 static int sti_platform_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *node = dev->of_node;
 	struct device_node *child_np;
 	struct component_match *match = NULL;

 	dma_set_coherent_mask(dev, DMA_BIT_MASK(32));

 	of_platform_populate(node, NULL, NULL, dev);

 	child_np = of_get_next_available_child(node, NULL);

 	while (child_np) {
 		component_match_add(dev, &match, compare_of, child_np);
 		of_node_put(child_np);
 		child_np = of_get_next_available_child(node, child_np);
 	}

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

 static int sti_platform_remove(struct platform_device *pdev)
 {
 	component_master_del(&pdev->dev, &sti_ops);
 	of_platform_depopulate(&pdev->dev);

 	return 0;
 }

 static const struct of_device_id sti_dt_ids[] = {
 	{ .compatible = "st,sti-display-subsystem", },
 	{ /* end node */ },
 };
 MODULE_DEVICE_TABLE(of, sti_dt_ids);

 static struct platform_driver sti_platform_driver = {
 	.probe = sti_platform_probe,
 	.remove = sti_platform_remove,
 	.driver = {
 		.name = DRIVER_NAME,
 		.of_match_table = sti_dt_ids,
 	},
 };

 static struct platform_driver * const drivers[] = {
 	&sti_tvout_driver,
 	&sti_vtac_driver,
 	&sti_hqvdp_driver,
 	&sti_hdmi_driver,
 	&sti_hda_driver,
 	&sti_dvo_driver,
 	&sti_vtg_driver,
 	&sti_compositor_driver,
 	&sti_platform_driver,
 };

 static int sti_drm_init(void)
 {
 	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 }
 module_init(sti_drm_init);

 static void sti_drm_exit(void)
 {
 	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 }
 module_exit(sti_drm_exit);

 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (C) STMicroelectronics SA 2014
	* Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
	* License terms: GNU General Public License (GPL), version 2
	*/

	#include <drm/drmP.h>

	#include <linux/component.h>
	#include <linux/debugfs.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of_platform.h>

	#include <drm/drm_atomic.h>
	#include <drm/drm_atomic_helper.h>
	#include <drm/drm_crtc_helper.h>
	#include <drm/drm_gem_cma_helper.h>
	#include <drm/drm_fb_cma_helper.h>

	#include "sti_crtc.h"
	#include "sti_drv.h"
	#include "sti_plane.h"

	#define DRIVER_NAME "sti"
	#define DRIVER_DESC "STMicroelectronics SoC DRM"
	#define DRIVER_DATE "20140601"
	#define DRIVER_MAJOR 1
	#define DRIVER_MINOR 0

	#define STI_MAX_FB_HEIGHT 4096
	#define STI_MAX_FB_WIDTH 4096

	static int sti_drm_fps_get(void data, u64 val)
	{
	struct drm_device *drm_dev = data;
	struct drm_plane *p;
	unsigned int i = 0;

	*val = 0;
	list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
	struct sti_plane *plane = to_sti_plane(p);

	*val \|= plane->fps_info.output << i;
	i++;
	}

	return 0;
	}

	static int sti_drm_fps_set(void *data, u64 val)
	{
	struct drm_device *drm_dev = data;
	struct drm_plane *p;
	unsigned int i = 0;

	list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
	struct sti_plane *plane = to_sti_plane(p);

	plane->fps_info.output = (val >> i) & 1;
	i++;
	}

	return 0;
	}

	DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops,
	sti_drm_fps_get, sti_drm_fps_set, "%llu\n");

	static int sti_drm_fps_dbg_show(struct seq_file s, void data)
	{
	struct drm_info_node *node = s->private;
	struct drm_device *dev = node->minor->dev;
	struct drm_plane *p;
	int ret;

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
	return ret;

	list_for_each_entry(p, &dev->mode_config.plane_list, head) {
	struct sti_plane *plane = to_sti_plane(p);

	seq_printf(s, "%s%s\n",
	plane->fps_info.fps_str,
	plane->fps_info.fips_str);
	}

	mutex_unlock(&dev->struct_mutex);
	return 0;
	}

	static struct drm_info_list sti_drm_dbg_list[] = {
	{"fps_get", sti_drm_fps_dbg_show, 0},
	};

	static int sti_drm_debugfs_create(struct dentry *root,
	struct drm_minor *minor,
	const char *name,
	const struct file_operations *fops)
	{
	struct drm_device *dev = minor->dev;
	struct drm_info_node *node;
	struct dentry *ent;

	ent = debugfs_create_file(name, S_IRUGO \| S_IWUSR, root, dev, fops);
	if (IS_ERR(ent))
	return PTR_ERR(ent);

	node = kmalloc(sizeof(*node), GFP_KERNEL);
	if (!node) {
	debugfs_remove(ent);
	return -ENOMEM;
	}

	node->minor = minor;
	node->dent = ent;
	node->info_ent = (void *)fops;

	mutex_lock(&minor->debugfs_lock);
	list_add(&node->list, &minor->debugfs_list);
	mutex_unlock(&minor->debugfs_lock);

	return 0;
	}

	static int sti_drm_dbg_init(struct drm_minor *minor)
	{
	int ret;

	ret = drm_debugfs_create_files(sti_drm_dbg_list,
	ARRAY_SIZE(sti_drm_dbg_list),
	minor->debugfs_root, minor);
	if (ret)
	goto err;

	ret = sti_drm_debugfs_create(minor->debugfs_root, minor, "fps_show",
	&sti_drm_fps_fops);
	if (ret)
	goto err;

	DRM_INFO("%s: debugfs installed\n", DRIVER_NAME);
	return 0;
	err:
	DRM_ERROR("%s: cannot install debugfs\n", DRIVER_NAME);
	return ret;
	}

	void sti_drm_dbg_cleanup(struct drm_minor *minor)
	{
	drm_debugfs_remove_files(sti_drm_dbg_list,
	ARRAY_SIZE(sti_drm_dbg_list), minor);

	drm_debugfs_remove_files((struct drm_info_list *)&sti_drm_fps_fops,
	1, minor);
	}

	static void sti_atomic_schedule(struct sti_private *private,
	struct drm_atomic_state *state)
	{
	private->commit.state = state;
	schedule_work(&private->commit.work);
	}

	static void sti_atomic_complete(struct sti_private *private,
	struct drm_atomic_state *state)
	{
	struct drm_device *drm = private->drm_dev;

	/*
	* Everything below can be run asynchronously without the need to grab
	* any modeset locks at all under one condition: It must be guaranteed
	* that the asynchronous work has either been cancelled (if the driver
	* supports it, which at least requires that the framebuffers get
	* cleaned up with drm_atomic_helper_cleanup_planes()) or completed
	* before the new state gets committed on the software side with
	* drm_atomic_helper_swap_state().
	*
	* This scheme allows new atomic state updates to be prepared and
	* checked in parallel to the asynchronous completion of the previous
	* update. Which is important since compositors need to figure out the
	* composition of the next frame right after having submitted the
	* current layout.
	*/

	drm_atomic_helper_commit_modeset_disables(drm, state);
	drm_atomic_helper_commit_planes(drm, state, false);
	drm_atomic_helper_commit_modeset_enables(drm, state);

	drm_atomic_helper_wait_for_vblanks(drm, state);

	drm_atomic_helper_cleanup_planes(drm, state);
	drm_atomic_state_free(state);
	}

	static void sti_atomic_work(struct work_struct *work)
	{
	struct sti_private *private = container_of(work,
	struct sti_private, commit.work);

	sti_atomic_complete(private, private->commit.state);
	}

	static int sti_atomic_commit(struct drm_device *drm,
	struct drm_atomic_state *state, bool nonblock)
	{
	struct sti_private *private = drm->dev_private;
	int err;

	err = drm_atomic_helper_prepare_planes(drm, state);
	if (err)
	return err;

	/* serialize outstanding nonblocking commits */
	mutex_lock(&private->commit.lock);
	flush_work(&private->commit.work);

	/*
	* This is the point of no return - everything below never fails except
	* when the hw goes bonghits. Which means we can commit the new state on
	* the software side now.
	*/

	drm_atomic_helper_swap_state(drm, state);

	if (nonblock)
	sti_atomic_schedule(private, state);
	else
	sti_atomic_complete(private, state);

	mutex_unlock(&private->commit.lock);
	return 0;
	}

	static const struct drm_mode_config_funcs sti_mode_config_funcs = {
	.fb_create = drm_fb_cma_create,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = sti_atomic_commit,
	};

	static void sti_mode_config_init(struct drm_device *dev)
	{
	dev->mode_config.min_width = 0;
	dev->mode_config.min_height = 0;

	/*
	* set max width and height as default value.
	* this value would be used to check framebuffer size limitation
	* at drm_mode_addfb().
	*/
	dev->mode_config.max_width = STI_MAX_FB_WIDTH;
	dev->mode_config.max_height = STI_MAX_FB_HEIGHT;

	dev->mode_config.funcs = &sti_mode_config_funcs;
	}

	static int sti_load(struct drm_device *dev, unsigned long flags)
	{
	struct sti_private *private;
	int ret;

	private = kzalloc(sizeof(*private), GFP_KERNEL);
	if (!private) {
	DRM_ERROR("Failed to allocate private\n");
	return -ENOMEM;
	}
	dev->dev_private = (void *)private;
	private->drm_dev = dev;

	mutex_init(&private->commit.lock);
	INIT_WORK(&private->commit.work, sti_atomic_work);

	drm_mode_config_init(dev);
	drm_kms_helper_poll_init(dev);

	sti_mode_config_init(dev);

	ret = component_bind_all(dev->dev, dev);
	if (ret) {
	drm_kms_helper_poll_fini(dev);
	drm_mode_config_cleanup(dev);
	kfree(private);
	return ret;
	}

	drm_mode_config_reset(dev);

	drm_helper_disable_unused_functions(dev);
	drm_fbdev_cma_init(dev, 32,
	dev->mode_config.num_crtc,
	dev->mode_config.num_connector);

	return 0;
	}

	static const struct file_operations sti_driver_fops = {
	.owner = THIS_MODULE,
	.open = drm_open,
	.mmap = drm_gem_cma_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 sti_driver = {
	.driver_features = DRIVER_HAVE_IRQ \| DRIVER_MODESET \|
	DRIVER_GEM \| DRIVER_PRIME \| DRIVER_ATOMIC,
	.load = sti_load,
	.gem_free_object = drm_gem_cma_free_object,
	.gem_vm_ops = &drm_gem_cma_vm_ops,
	.dumb_create = drm_gem_cma_dumb_create,
	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
	.dumb_destroy = drm_gem_dumb_destroy,
	.fops = &sti_driver_fops,

	.get_vblank_counter = drm_vblank_no_hw_counter,
	.enable_vblank = sti_crtc_enable_vblank,
	.disable_vblank = sti_crtc_disable_vblank,

	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
	.gem_prime_export = drm_gem_prime_export,
	.gem_prime_import = drm_gem_prime_import,
	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
	.gem_prime_vmap = drm_gem_cma_prime_vmap,
	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
	.gem_prime_mmap = drm_gem_cma_prime_mmap,

	.debugfs_init = sti_drm_dbg_init,
	.debugfs_cleanup = sti_drm_dbg_cleanup,

	.name = DRIVER_NAME,
	.desc = DRIVER_DESC,
	.date = DRIVER_DATE,
	.major = DRIVER_MAJOR,
	.minor = DRIVER_MINOR,
	};

	static int compare_of(struct device dev, void data)
	{
	return dev->of_node == data;
	}

	static int sti_bind(struct device *dev)
	{
	return drm_platform_init(&sti_driver, to_platform_device(dev));
	}

	static void sti_unbind(struct device *dev)
	{
	drm_put_dev(dev_get_drvdata(dev));
	}

	static const struct component_master_ops sti_ops = {
	.bind = sti_bind,
	.unbind = sti_unbind,
	};

	static int sti_platform_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct device_node *node = dev->of_node;
	struct device_node *child_np;
	struct component_match *match = NULL;

	dma_set_coherent_mask(dev, DMA_BIT_MASK(32));

	of_platform_populate(node, NULL, NULL, dev);

	child_np = of_get_next_available_child(node, NULL);

	while (child_np) {
	component_match_add(dev, &match, compare_of, child_np);
	of_node_put(child_np);
	child_np = of_get_next_available_child(node, child_np);
	}

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

	static int sti_platform_remove(struct platform_device *pdev)
	{
	component_master_del(&pdev->dev, &sti_ops);
	of_platform_depopulate(&pdev->dev);

	return 0;
	}

	static const struct of_device_id sti_dt_ids[] = {
	{ .compatible = "st,sti-display-subsystem", },
	{ /* end node */ },
	};
	MODULE_DEVICE_TABLE(of, sti_dt_ids);

	static struct platform_driver sti_platform_driver = {
	.probe = sti_platform_probe,
	.remove = sti_platform_remove,
	.driver = {
	.name = DRIVER_NAME,
	.of_match_table = sti_dt_ids,
	},
	};

	static struct platform_driver * const drivers[] = {
	&sti_tvout_driver,
	&sti_vtac_driver,
	&sti_hqvdp_driver,
	&sti_hdmi_driver,
	&sti_hda_driver,
	&sti_dvo_driver,
	&sti_vtg_driver,
	&sti_compositor_driver,
	&sti_platform_driver,
	};

	static int sti_drm_init(void)
	{
	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
	}
	module_init(sti_drm_init);

	static void sti_drm_exit(void)
	{
	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
	}
	module_exit(sti_drm_exit);

	MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
	MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
	MODULE_LICENSE("GPL");