drivers/gpu/drm/imx/imx-drm-core.c - arm/linux - Git at Google

 /*
  * Freescale i.MX drm driver
  *
  * Copyright (C) 2011 Sascha Hauer, Pengutronix
  *
  * 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.
  * 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 <linux/component.h>
 #include <linux/device.h>
 #include <linux/dma-buf.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <drm/drmP.h>
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_of.h>
 #include <video/imx-ipu-v3.h>

 #include "imx-drm.h"
 #include "ipuv3-plane.h"

 #define MAX_CRTC	4

 struct imx_drm_device {
 	struct drm_device			*drm;
 	unsigned int				pipes;
 	struct drm_fbdev_cma			*fbhelper;
 	struct drm_atomic_state			*state;
 };

 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 static int legacyfb_depth = 16;
 module_param(legacyfb_depth, int, 0444);
 #endif

 static void imx_drm_driver_lastclose(struct drm_device *drm)
 {
 	struct imx_drm_device *imxdrm = drm->dev_private;

 	drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
 }

 DEFINE_DRM_GEM_CMA_FOPS(imx_drm_driver_fops);

 void imx_drm_connector_destroy(struct drm_connector *connector)
 {
 	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
 }
 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);

 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
 {
 	drm_encoder_cleanup(encoder);
 }
 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);

 static void imx_drm_output_poll_changed(struct drm_device *drm)
 {
 	struct imx_drm_device *imxdrm = drm->dev_private;

 	drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
 }

 static int imx_drm_atomic_check(struct drm_device *dev,
 				struct drm_atomic_state *state)
 {
 	int ret;

 	ret = drm_atomic_helper_check_modeset(dev, state);
 	if (ret)
 		return ret;

 	ret = drm_atomic_helper_check_planes(dev, state);
 	if (ret)
 		return ret;

 	/*
 	 * Check modeset again in case crtc_state->mode_changed is
 	 * updated in plane's ->atomic_check callback.
 	 */
 	ret = drm_atomic_helper_check_modeset(dev, state);
 	if (ret)
 		return ret;

 	/* Assign PRG/PRE channels and check if all constrains are satisfied. */
 	ret = ipu_planes_assign_pre(dev, state);
 	if (ret)
 		return ret;

 	return ret;
 }

 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
 	.fb_create = drm_gem_fb_create,
 	.output_poll_changed = imx_drm_output_poll_changed,
 	.atomic_check = imx_drm_atomic_check,
 	.atomic_commit = drm_atomic_helper_commit,
 };

 static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;
 	struct drm_plane *plane;
 	struct drm_plane_state *old_plane_state, *new_plane_state;
 	bool plane_disabling = false;
 	int i;

 	drm_atomic_helper_commit_modeset_disables(dev, state);

 	drm_atomic_helper_commit_planes(dev, state,
 				DRM_PLANE_COMMIT_ACTIVE_ONLY |
 				DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);

 	drm_atomic_helper_commit_modeset_enables(dev, state);

 	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
 		if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
 			plane_disabling = true;
 	}

 	/*
 	 * The flip done wait is only strictly required by imx-drm if a deferred
 	 * plane disable is in-flight. As the core requires blocking commits
 	 * to wait for the flip it is done here unconditionally. This keeps the
 	 * workitem around a bit longer than required for the majority of
 	 * non-blocking commits, but we accept that for the sake of simplicity.
 	 */
 	drm_atomic_helper_wait_for_flip_done(dev, state);

 	if (plane_disabling) {
 		for_each_old_plane_in_state(state, plane, old_plane_state, i)
 			ipu_plane_disable_deferred(plane);

 	}

 	drm_atomic_helper_commit_hw_done(state);
 }

 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
 	.atomic_commit_tail = imx_drm_atomic_commit_tail,
 };


 int imx_drm_encoder_parse_of(struct drm_device *drm,
 	struct drm_encoder *encoder, struct device_node *np)
 {
 	uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);

 	/*
 	 * If we failed to find the CRTC(s) which this encoder is
 	 * supposed to be connected to, it's because the CRTC has
 	 * not been registered yet.  Defer probing, and hope that
 	 * the required CRTC is added later.
 	 */
 	if (crtc_mask == 0)
 		return -EPROBE_DEFER;

 	encoder->possible_crtcs = crtc_mask;

 	/* FIXME: this is the mask of outputs which can clone this output. */
 	encoder->possible_clones = ~0;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);

 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 	/* none so far */
 };

 static struct drm_driver imx_drm_driver = {
 	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 				  DRIVER_ATOMIC,
 	.lastclose		= imx_drm_driver_lastclose,
 	.gem_free_object_unlocked = drm_gem_cma_free_object,
 	.gem_vm_ops		= &drm_gem_cma_vm_ops,
 	.dumb_create		= drm_gem_cma_dumb_create,

 	.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	= 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,
 	.ioctls			= imx_drm_ioctls,
 	.num_ioctls		= ARRAY_SIZE(imx_drm_ioctls),
 	.fops			= &imx_drm_driver_fops,
 	.name			= "imx-drm",
 	.desc			= "i.MX DRM graphics",
 	.date			= "20120507",
 	.major			= 1,
 	.minor			= 0,
 	.patchlevel		= 0,
 };

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

 	/* Special case for DI, dev->of_node may not be set yet */
 	if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
 		struct ipu_client_platformdata *pdata = dev->platform_data;

 		return pdata->of_node == np;
 	}

 	/* Special case for LDB, one device for two channels */
 	if (of_node_cmp(np->name, "lvds-channel") == 0) {
 		np = of_get_parent(np);
 		of_node_put(np);
 	}

 	return dev->of_node == np;
 }

 static int imx_drm_bind(struct device *dev)
 {
 	struct drm_device *drm;
 	struct imx_drm_device *imxdrm;
 	int ret;

 	drm = drm_dev_alloc(&imx_drm_driver, dev);
 	if (IS_ERR(drm))
 		return PTR_ERR(drm);

 	imxdrm = devm_kzalloc(dev, sizeof(*imxdrm), GFP_KERNEL);
 	if (!imxdrm) {
 		ret = -ENOMEM;
 		goto err_unref;
 	}

 	imxdrm->drm = drm;
 	drm->dev_private = imxdrm;

 	/*
 	 * enable drm irq mode.
 	 * - with irq_enabled = true, we can use the vblank feature.
 	 *
 	 * P.S. note that we wouldn't use drm irq handler but
 	 *      just specific driver own one instead because
 	 *      drm framework supports only one irq handler and
 	 *      drivers can well take care of their interrupts
 	 */
 	drm->irq_enabled = true;

 	/*
 	 * set max width and height as default value(4096x4096).
 	 * this value would be used to check framebuffer size limitation
 	 * at drm_mode_addfb().
 	 */
 	drm->mode_config.min_width = 1;
 	drm->mode_config.min_height = 1;
 	drm->mode_config.max_width = 4096;
 	drm->mode_config.max_height = 4096;
 	drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 	drm->mode_config.helper_private = &imx_drm_mode_config_helpers;

 	drm_mode_config_init(drm);

 	ret = drm_vblank_init(drm, MAX_CRTC);
 	if (ret)
 		goto err_kms;

 	dev_set_drvdata(dev, drm);

 	/* Now try and bind all our sub-components */
 	ret = component_bind_all(dev, drm);
 	if (ret)
 		goto err_kms;

 	drm_mode_config_reset(drm);

 	/*
 	 * All components are now initialised, so setup the fb helper.
 	 * The fb helper takes copies of key hardware information, so the
 	 * crtcs/connectors/encoders must not change after this point.
 	 */
 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 	if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 		dev_warn(dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 		legacyfb_depth = 16;
 	}
 	imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth, MAX_CRTC);
 	if (IS_ERR(imxdrm->fbhelper)) {
 		ret = PTR_ERR(imxdrm->fbhelper);
 		imxdrm->fbhelper = NULL;
 		goto err_unbind;
 	}
 #endif

 	drm_kms_helper_poll_init(drm);

 	ret = drm_dev_register(drm, 0);
 	if (ret)
 		goto err_fbhelper;

 	return 0;

 err_fbhelper:
 	drm_kms_helper_poll_fini(drm);
 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 	if (imxdrm->fbhelper)
 		drm_fbdev_cma_fini(imxdrm->fbhelper);
 err_unbind:
 #endif
 	component_unbind_all(drm->dev, drm);
 err_kms:
 	drm_mode_config_cleanup(drm);
 err_unref:
 	drm_dev_unref(drm);

 	return ret;
 }

 static void imx_drm_unbind(struct device *dev)
 {
 	struct drm_device *drm = dev_get_drvdata(dev);
 	struct imx_drm_device *imxdrm = drm->dev_private;

 	drm_dev_unregister(drm);

 	drm_kms_helper_poll_fini(drm);

 	if (imxdrm->fbhelper)
 		drm_fbdev_cma_fini(imxdrm->fbhelper);

 	drm_mode_config_cleanup(drm);

 	component_unbind_all(drm->dev, drm);
 	dev_set_drvdata(dev, NULL);

 	drm_dev_unref(drm);
 }

 static const struct component_master_ops imx_drm_ops = {
 	.bind = imx_drm_bind,
 	.unbind = imx_drm_unbind,
 };

 static int imx_drm_platform_probe(struct platform_device *pdev)
 {
 	int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);

 	if (!ret)
 		ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));

 	return ret;
 }

 static int imx_drm_platform_remove(struct platform_device *pdev)
 {
 	component_master_del(&pdev->dev, &imx_drm_ops);
 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int imx_drm_suspend(struct device *dev)
 {
 	struct drm_device *drm_dev = dev_get_drvdata(dev);
 	struct imx_drm_device *imxdrm;

 	/* The drm_dev is NULL before .load hook is called */
 	if (drm_dev == NULL)
 		return 0;

 	drm_kms_helper_poll_disable(drm_dev);

 	imxdrm = drm_dev->dev_private;
 	imxdrm->state = drm_atomic_helper_suspend(drm_dev);
 	if (IS_ERR(imxdrm->state)) {
 		drm_kms_helper_poll_enable(drm_dev);
 		return PTR_ERR(imxdrm->state);
 	}

 	return 0;
 }

 static int imx_drm_resume(struct device *dev)
 {
 	struct drm_device *drm_dev = dev_get_drvdata(dev);
 	struct imx_drm_device *imx_drm;

 	if (drm_dev == NULL)
 		return 0;

 	imx_drm = drm_dev->dev_private;
 	drm_atomic_helper_resume(drm_dev, imx_drm->state);
 	drm_kms_helper_poll_enable(drm_dev);

 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);

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

 static struct platform_driver imx_drm_pdrv = {
 	.probe		= imx_drm_platform_probe,
 	.remove		= imx_drm_platform_remove,
 	.driver		= {
 		.name	= "imx-drm",
 		.pm	= &imx_drm_pm_ops,
 		.of_match_table = imx_drm_dt_ids,
 	},
 };

 static struct platform_driver * const drivers[] = {
 	&imx_drm_pdrv,
 	&ipu_drm_driver,
 };

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

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

 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 MODULE_DESCRIPTION("i.MX drm driver core");
 MODULE_LICENSE("GPL");
	/*
	* Freescale i.MX drm driver
	*
	* Copyright (C) 2011 Sascha Hauer, Pengutronix
	*
	* 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.
	* 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 <linux/component.h>
	#include <linux/device.h>
	#include <linux/dma-buf.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <drm/drmP.h>
	#include <drm/drm_atomic.h>
	#include <drm/drm_atomic_helper.h>
	#include <drm/drm_fb_helper.h>
	#include <drm/drm_crtc_helper.h>
	#include <drm/drm_gem_cma_helper.h>
	#include <drm/drm_gem_framebuffer_helper.h>
	#include <drm/drm_fb_cma_helper.h>
	#include <drm/drm_plane_helper.h>
	#include <drm/drm_of.h>
	#include <video/imx-ipu-v3.h>

	#include "imx-drm.h"
	#include "ipuv3-plane.h"

	#define MAX_CRTC 4

	struct imx_drm_device {
	struct drm_device *drm;
	unsigned int pipes;
	struct drm_fbdev_cma *fbhelper;
	struct drm_atomic_state *state;
	};

	#if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
	static int legacyfb_depth = 16;
	module_param(legacyfb_depth, int, 0444);
	#endif

	static void imx_drm_driver_lastclose(struct drm_device *drm)
	{
	struct imx_drm_device *imxdrm = drm->dev_private;

	drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
	}

	DEFINE_DRM_GEM_CMA_FOPS(imx_drm_driver_fops);

	void imx_drm_connector_destroy(struct drm_connector *connector)
	{
	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);
	}
	EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);

	void imx_drm_encoder_destroy(struct drm_encoder *encoder)
	{
	drm_encoder_cleanup(encoder);
	}
	EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);

	static void imx_drm_output_poll_changed(struct drm_device *drm)
	{
	struct imx_drm_device *imxdrm = drm->dev_private;

	drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
	}

	static int imx_drm_atomic_check(struct drm_device *dev,
	struct drm_atomic_state *state)
	{
	int ret;

	ret = drm_atomic_helper_check_modeset(dev, state);
	if (ret)
	return ret;

	ret = drm_atomic_helper_check_planes(dev, state);
	if (ret)
	return ret;

	/*
	* Check modeset again in case crtc_state->mode_changed is
	* updated in plane's ->atomic_check callback.
	*/
	ret = drm_atomic_helper_check_modeset(dev, state);
	if (ret)
	return ret;

	/* Assign PRG/PRE channels and check if all constrains are satisfied. */
	ret = ipu_planes_assign_pre(dev, state);
	if (ret)
	return ret;

	return ret;
	}

	static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
	.fb_create = drm_gem_fb_create,
	.output_poll_changed = imx_drm_output_poll_changed,
	.atomic_check = imx_drm_atomic_check,
	.atomic_commit = drm_atomic_helper_commit,
	};

	static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
	{
	struct drm_device *dev = state->dev;
	struct drm_plane *plane;
	struct drm_plane_state old_plane_state, new_plane_state;
	bool plane_disabling = false;
	int i;

	drm_atomic_helper_commit_modeset_disables(dev, state);

	drm_atomic_helper_commit_planes(dev, state,
	DRM_PLANE_COMMIT_ACTIVE_ONLY \|
	DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);

	drm_atomic_helper_commit_modeset_enables(dev, state);

	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
	if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
	plane_disabling = true;
	}

	/*
	* The flip done wait is only strictly required by imx-drm if a deferred
	* plane disable is in-flight. As the core requires blocking commits
	* to wait for the flip it is done here unconditionally. This keeps the
	* workitem around a bit longer than required for the majority of
	* non-blocking commits, but we accept that for the sake of simplicity.
	*/
	drm_atomic_helper_wait_for_flip_done(dev, state);

	if (plane_disabling) {
	for_each_old_plane_in_state(state, plane, old_plane_state, i)
	ipu_plane_disable_deferred(plane);

	}

	drm_atomic_helper_commit_hw_done(state);
	}

	static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
	.atomic_commit_tail = imx_drm_atomic_commit_tail,
	};


	int imx_drm_encoder_parse_of(struct drm_device *drm,
	struct drm_encoder encoder, struct device_node np)
	{
	uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);

	/*
	* If we failed to find the CRTC(s) which this encoder is
	* supposed to be connected to, it's because the CRTC has
	* not been registered yet. Defer probing, and hope that
	* the required CRTC is added later.
	*/
	if (crtc_mask == 0)
	return -EPROBE_DEFER;

	encoder->possible_crtcs = crtc_mask;

	/* FIXME: this is the mask of outputs which can clone this output. */
	encoder->possible_clones = ~0;

	return 0;
	}
	EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);

	static const struct drm_ioctl_desc imx_drm_ioctls[] = {
	/* none so far */
	};

	static struct drm_driver imx_drm_driver = {
	.driver_features = DRIVER_MODESET \| DRIVER_GEM \| DRIVER_PRIME \|
	DRIVER_ATOMIC,
	.lastclose = imx_drm_driver_lastclose,
	.gem_free_object_unlocked = drm_gem_cma_free_object,
	.gem_vm_ops = &drm_gem_cma_vm_ops,
	.dumb_create = drm_gem_cma_dumb_create,

	.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 = 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,
	.ioctls = imx_drm_ioctls,
	.num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
	.fops = &imx_drm_driver_fops,
	.name = "imx-drm",
	.desc = "i.MX DRM graphics",
	.date = "20120507",
	.major = 1,
	.minor = 0,
	.patchlevel = 0,
	};

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

	/* Special case for DI, dev->of_node may not be set yet */
	if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
	struct ipu_client_platformdata *pdata = dev->platform_data;

	return pdata->of_node == np;
	}

	/* Special case for LDB, one device for two channels */
	if (of_node_cmp(np->name, "lvds-channel") == 0) {
	np = of_get_parent(np);
	of_node_put(np);
	}

	return dev->of_node == np;
	}

	static int imx_drm_bind(struct device *dev)
	{
	struct drm_device *drm;
	struct imx_drm_device *imxdrm;
	int ret;

	drm = drm_dev_alloc(&imx_drm_driver, dev);
	if (IS_ERR(drm))
	return PTR_ERR(drm);

	imxdrm = devm_kzalloc(dev, sizeof(*imxdrm), GFP_KERNEL);
	if (!imxdrm) {
	ret = -ENOMEM;
	goto err_unref;
	}

	imxdrm->drm = drm;
	drm->dev_private = imxdrm;

	/*
	* enable drm irq mode.
	* - with irq_enabled = true, we can use the vblank feature.
	*
	* P.S. note that we wouldn't use drm irq handler but
	* just specific driver own one instead because
	* drm framework supports only one irq handler and
	* drivers can well take care of their interrupts
	*/
	drm->irq_enabled = true;

	/*
	* set max width and height as default value(4096x4096).
	* this value would be used to check framebuffer size limitation
	* at drm_mode_addfb().
	*/
	drm->mode_config.min_width = 1;
	drm->mode_config.min_height = 1;
	drm->mode_config.max_width = 4096;
	drm->mode_config.max_height = 4096;
	drm->mode_config.funcs = &imx_drm_mode_config_funcs;
	drm->mode_config.helper_private = &imx_drm_mode_config_helpers;

	drm_mode_config_init(drm);

	ret = drm_vblank_init(drm, MAX_CRTC);
	if (ret)
	goto err_kms;

	dev_set_drvdata(dev, drm);

	/* Now try and bind all our sub-components */
	ret = component_bind_all(dev, drm);
	if (ret)
	goto err_kms;

	drm_mode_config_reset(drm);

	/*
	* All components are now initialised, so setup the fb helper.
	* The fb helper takes copies of key hardware information, so the
	* crtcs/connectors/encoders must not change after this point.
	*/
	#if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
	if (legacyfb_depth != 16 && legacyfb_depth != 32) {
	dev_warn(dev, "Invalid legacyfb_depth. Defaulting to 16bpp\n");
	legacyfb_depth = 16;
	}
	imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth, MAX_CRTC);
	if (IS_ERR(imxdrm->fbhelper)) {
	ret = PTR_ERR(imxdrm->fbhelper);
	imxdrm->fbhelper = NULL;
	goto err_unbind;
	}
	#endif

	drm_kms_helper_poll_init(drm);

	ret = drm_dev_register(drm, 0);
	if (ret)
	goto err_fbhelper;

	return 0;

	err_fbhelper:
	drm_kms_helper_poll_fini(drm);
	#if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
	if (imxdrm->fbhelper)
	drm_fbdev_cma_fini(imxdrm->fbhelper);
	err_unbind:
	#endif
	component_unbind_all(drm->dev, drm);
	err_kms:
	drm_mode_config_cleanup(drm);
	err_unref:
	drm_dev_unref(drm);

	return ret;
	}

	static void imx_drm_unbind(struct device *dev)
	{
	struct drm_device *drm = dev_get_drvdata(dev);
	struct imx_drm_device *imxdrm = drm->dev_private;

	drm_dev_unregister(drm);

	drm_kms_helper_poll_fini(drm);

	if (imxdrm->fbhelper)
	drm_fbdev_cma_fini(imxdrm->fbhelper);

	drm_mode_config_cleanup(drm);

	component_unbind_all(drm->dev, drm);
	dev_set_drvdata(dev, NULL);

	drm_dev_unref(drm);
	}

	static const struct component_master_ops imx_drm_ops = {
	.bind = imx_drm_bind,
	.unbind = imx_drm_unbind,
	};

	static int imx_drm_platform_probe(struct platform_device *pdev)
	{
	int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);

	if (!ret)
	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));

	return ret;
	}

	static int imx_drm_platform_remove(struct platform_device *pdev)
	{
	component_master_del(&pdev->dev, &imx_drm_ops);
	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int imx_drm_suspend(struct device *dev)
	{
	struct drm_device *drm_dev = dev_get_drvdata(dev);
	struct imx_drm_device *imxdrm;

	/* The drm_dev is NULL before .load hook is called */
	if (drm_dev == NULL)
	return 0;

	drm_kms_helper_poll_disable(drm_dev);

	imxdrm = drm_dev->dev_private;
	imxdrm->state = drm_atomic_helper_suspend(drm_dev);
	if (IS_ERR(imxdrm->state)) {
	drm_kms_helper_poll_enable(drm_dev);
	return PTR_ERR(imxdrm->state);
	}

	return 0;
	}

	static int imx_drm_resume(struct device *dev)
	{
	struct drm_device *drm_dev = dev_get_drvdata(dev);
	struct imx_drm_device *imx_drm;

	if (drm_dev == NULL)
	return 0;

	imx_drm = drm_dev->dev_private;
	drm_atomic_helper_resume(drm_dev, imx_drm->state);
	drm_kms_helper_poll_enable(drm_dev);

	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);

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

	static struct platform_driver imx_drm_pdrv = {
	.probe = imx_drm_platform_probe,
	.remove = imx_drm_platform_remove,
	.driver = {
	.name = "imx-drm",
	.pm = &imx_drm_pm_ops,
	.of_match_table = imx_drm_dt_ids,
	},
	};

	static struct platform_driver * const drivers[] = {
	&imx_drm_pdrv,
	&ipu_drm_driver,
	};

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

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

	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
	MODULE_DESCRIPTION("i.MX drm driver core");
	MODULE_LICENSE("GPL");