/*
   * Copyright © 2006 Keith Packard
   * Copyright © 2007-2008 Dave Airlie
   * Copyright © 2007-2008 Intel Corporation
   *   Jesse Barnes <jesse.barnes@intel.com>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
   * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
   * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   * OTHER DEALINGS IN THE SOFTWARE.
   */
  #ifndef __DRM_CRTC_H__
  #define __DRM_CRTC_H__
  
  #include <linux/i2c.h>
  #include <linux/spinlock.h>
  #include <linux/types.h>
  #include <linux/idr.h>
  #include <linux/fb.h>
  #include <linux/hdmi.h>
  #include <linux/media-bus-format.h>
  #include <uapi/drm/drm_mode.h>
  #include <uapi/drm/drm_fourcc.h>
  #include <drm/drm_modeset_lock.h>
  
  struct drm_device;
  struct drm_mode_set;
  struct drm_framebuffer;
  struct drm_object_properties;
  struct drm_file;
  struct drm_clip_rect;
  struct device_node;
  struct fence;
  
  #define DRM_MODE_OBJECT_CRTC 0xcccccccc
  #define DRM_MODE_OBJECT_CONNECTOR 0xc0c0c0c0
  #define DRM_MODE_OBJECT_ENCODER 0xe0e0e0e0
  #define DRM_MODE_OBJECT_MODE 0xdededede
  #define DRM_MODE_OBJECT_PROPERTY 0xb0b0b0b0
  #define DRM_MODE_OBJECT_FB 0xfbfbfbfb
  #define DRM_MODE_OBJECT_BLOB 0xbbbbbbbb
  #define DRM_MODE_OBJECT_PLANE 0xeeeeeeee
  #define DRM_MODE_OBJECT_ANY 0
  
  struct drm_mode_object {
  	uint32_t id;
  	uint32_t type;
  	struct drm_object_properties *properties;
  };
  
  #define DRM_OBJECT_MAX_PROPERTY 24
  struct drm_object_properties {
  	int count, atomic_count;
  	/* NOTE: if we ever start dynamically destroying properties (ie.
  	 * not at drm_mode_config_cleanup() time), then we'd have to do
  	 * a better job of detaching property from mode objects to avoid
  	 * dangling property pointers:
  	 */
  	struct drm_property *properties[DRM_OBJECT_MAX_PROPERTY];
  	/* do not read/write values directly, but use drm_object_property_get_value()
  	 * and drm_object_property_set_value():
  	 */
  	uint64_t values[DRM_OBJECT_MAX_PROPERTY];
  };
  
  static inline int64_t U642I64(uint64_t val)
  {
  	return (int64_t)*((int64_t *)&val);
  }
  static inline uint64_t I642U64(int64_t val)
  {
  	return (uint64_t)*((uint64_t *)&val);
  }
  
  /* rotation property bits */
  #define DRM_ROTATE_MASK 0x0f
  #define DRM_ROTATE_0	0
  #define DRM_ROTATE_90	1
  #define DRM_ROTATE_180	2
  #define DRM_ROTATE_270	3
  #define DRM_REFLECT_MASK (~DRM_ROTATE_MASK)
  #define DRM_REFLECT_X	4
  #define DRM_REFLECT_Y	5
  
  enum drm_connector_force {
  	DRM_FORCE_UNSPECIFIED,
  	DRM_FORCE_OFF,
  	DRM_FORCE_ON,         /* force on analog part normally */
  	DRM_FORCE_ON_DIGITAL, /* for DVI-I use digital connector */
  };
  
  #include <drm/drm_modes.h>
  
  enum drm_connector_status {
  	connector_status_connected = 1,
  	connector_status_disconnected = 2,
  	connector_status_unknown = 3,
  };
  
  enum subpixel_order {
  	SubPixelUnknown = 0,
  	SubPixelHorizontalRGB,
  	SubPixelHorizontalBGR,
  	SubPixelVerticalRGB,
  	SubPixelVerticalBGR,
  	SubPixelNone,
  };
  
  #define DRM_COLOR_FORMAT_RGB444		(1<<0)
  #define DRM_COLOR_FORMAT_YCRCB444	(1<<1)
  #define DRM_COLOR_FORMAT_YCRCB422	(1<<2)
  /*
   * Describes a given display (e.g. CRT or flat panel) and its limitations.
   */
  struct drm_display_info {
  	char name[DRM_DISPLAY_INFO_LEN];
  
  	/* Physical size */
          unsigned int width_mm;
  	unsigned int height_mm;
  
  	/* Clock limits FIXME: storage format */
  	unsigned int min_vfreq, max_vfreq;
  	unsigned int min_hfreq, max_hfreq;
  	unsigned int pixel_clock;
  	unsigned int bpc;
  
  	enum subpixel_order subpixel_order;
  	u32 color_formats;
  
  	const u32 *bus_formats;
  	unsigned int num_bus_formats;
  
  	/* Mask of supported hdmi deep color modes */
  	u8 edid_hdmi_dc_modes;
  
  	u8 cea_rev;
  };
  
  /* data corresponds to displayid vend/prod/serial */
  struct drm_tile_group {
  	struct kref refcount;
  	struct drm_device *dev;
  	int id;
  	u8 group_data[8];
  };
  
  struct drm_framebuffer_funcs {
  	/* note: use drm_framebuffer_remove() */
  	void (*destroy)(struct drm_framebuffer *framebuffer);
  	int (*create_handle)(struct drm_framebuffer *fb,
  			     struct drm_file *file_priv,
  			     unsigned int *handle);
  	/*
  	 * Optional callback for the dirty fb ioctl.
  	 *
  	 * Userspace can notify the driver via this callback
  	 * that a area of the framebuffer has changed and should
  	 * be flushed to the display hardware.
  	 *
  	 * See documentation in drm_mode.h for the struct
  	 * drm_mode_fb_dirty_cmd for more information as all
  	 * the semantics and arguments have a one to one mapping
  	 * on this function.
  	 */
  	int (*dirty)(struct drm_framebuffer *framebuffer,
  		     struct drm_file *file_priv, unsigned flags,
  		     unsigned color, struct drm_clip_rect *clips,
  		     unsigned num_clips);
  };
  
  struct drm_framebuffer {
  	struct drm_device *dev;
  	/*
  	 * Note that the fb is refcounted for the benefit of driver internals,
  	 * for example some hw, disabling a CRTC/plane is asynchronous, and
  	 * scanout does not actually complete until the next vblank.  So some
  	 * cleanup (like releasing the reference(s) on the backing GEM bo(s))
  	 * should be deferred.  In cases like this, the driver would like to
  	 * hold a ref to the fb even though it has already been removed from
  	 * userspace perspective.
  	 */
  	struct kref refcount;
  	/*
  	 * Place on the dev->mode_config.fb_list, access protected by
  	 * dev->mode_config.fb_lock.
  	 */
  	struct list_head head;
  	struct drm_mode_object base;
  	const struct drm_framebuffer_funcs *funcs;
  	unsigned int pitches[4];
  	unsigned int offsets[4];
  	uint64_t modifier[4];
  	unsigned int width;
  	unsigned int height;
  	/* depth can be 15 or 16 */
  	unsigned int depth;
  	int bits_per_pixel;
  	int flags;
  	uint32_t pixel_format; /* fourcc format */
  	struct list_head filp_head;
  };
  
  struct drm_property_blob {
  	struct drm_mode_object base;
  	struct drm_device *dev;
  	struct kref refcount;
  	struct list_head head_global;
  	struct list_head head_file;
  	size_t length;
  	unsigned char data[];
  };
  
  struct drm_property_enum {
  	uint64_t value;
  	struct list_head head;
  	char name[DRM_PROP_NAME_LEN];
  };
  
  struct drm_property {
  	struct list_head head;
  	struct drm_mode_object base;
  	uint32_t flags;
  	char name[DRM_PROP_NAME_LEN];
  	uint32_t num_values;
  	uint64_t *values;
  	struct drm_device *dev;
  
  	struct list_head enum_list;
  };
  
  struct drm_crtc;
  struct drm_connector;
  struct drm_encoder;
  struct drm_pending_vblank_event;
  struct drm_plane;
  struct drm_bridge;
  struct drm_atomic_state;
  
  /**
   * struct drm_crtc_state - mutable CRTC state
   * @crtc: backpointer to the CRTC
   * @enable: whether the CRTC should be enabled, gates all other state
   * @active: whether the CRTC is actively displaying (used for DPMS)
   * @planes_changed: planes on this crtc are updated
   * @mode_changed: crtc_state->mode or crtc_state->enable has been changed
   * @active_changed: crtc_state->active has been toggled.
   * @connectors_changed: connectors to this crtc have been updated
   * @color_mgmt_changed: color management properties have changed (degamma or
   *	gamma LUT or CSC matrix)
   * @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
   * @last_vblank_count: for helpers and drivers to capture the vblank of the
   * 	update to ensure framebuffer cleanup isn't done too early
   * @adjusted_mode: for use by helpers and drivers to compute adjusted mode timings
   * @mode: current mode timings
   * @degamma_lut: Lookup table for converting framebuffer pixel data
   *	before apply the conversion matrix
   * @ctm: Transformation matrix
   * @gamma_lut: Lookup table for converting pixel data after the
   *	conversion matrix
   * @event: optional pointer to a DRM event to signal upon completion of the
   * 	state update
   * @state: backpointer to global drm_atomic_state
   *
   * Note that the distinction between @enable and @active is rather subtile:
   * Flipping @active while @enable is set without changing anything else may
   * never return in a failure from the ->atomic_check callback. Userspace assumes
   * that a DPMS On will always succeed. In other words: @enable controls resource
   * assignment, @active controls the actual hardware state.
   */
  struct drm_crtc_state {
  	struct drm_crtc *crtc;
  
  	bool enable;
  	bool active;
  
  	/* computed state bits used by helpers and drivers */
  	bool planes_changed : 1;
  	bool mode_changed : 1;
  	bool active_changed : 1;
  	bool connectors_changed : 1;
  	bool color_mgmt_changed : 1;
  
  	/* attached planes bitmask:
  	 * WARNING: transitional helpers do not maintain plane_mask so
  	 * drivers not converted over to atomic helpers should not rely
  	 * on plane_mask being accurate!
  	 */
  	u32 plane_mask;
  
  	/* last_vblank_count: for vblank waits before cleanup */
  	u32 last_vblank_count;
  
  	/* adjusted_mode: for use by helpers and drivers */
  	struct drm_display_mode adjusted_mode;
  
  	struct drm_display_mode mode;
  
  	/* blob property to expose current mode to atomic userspace */
  	struct drm_property_blob *mode_blob;
  
  	/* blob property to expose color management to userspace */
  	struct drm_property_blob *degamma_lut;
  	struct drm_property_blob *ctm;
  	struct drm_property_blob *gamma_lut;
  
  	struct drm_pending_vblank_event *event;
  
  	struct drm_atomic_state *state;
  };
  
  /**
   * struct drm_crtc_funcs - control CRTCs for a given device
   * @save: save CRTC state
   * @restore: restore CRTC state
   * @reset: reset CRTC after state has been invalidated (e.g. resume)
   * @cursor_set: setup the cursor
   * @cursor_set2: setup the cursor with hotspot, superseeds @cursor_set if set
   * @cursor_move: move the cursor
   * @gamma_set: specify color ramp for CRTC
   * @destroy: deinit and free object
   * @set_property: called when a property is changed
   * @set_config: apply a new CRTC configuration
   * @page_flip: initiate a page flip
   * @atomic_duplicate_state: duplicate the atomic state for this CRTC
   * @atomic_destroy_state: destroy an atomic state for this CRTC
   * @atomic_set_property: set a property on an atomic state for this CRTC
   *    (do not call directly, use drm_atomic_crtc_set_property())
   * @atomic_get_property: get a property on an atomic state for this CRTC
   *    (do not call directly, use drm_atomic_crtc_get_property())
   *
   * The drm_crtc_funcs structure is the central CRTC management structure
   * in the DRM.  Each CRTC controls one or more connectors (note that the name
   * CRTC is simply historical, a CRTC may control LVDS, VGA, DVI, TV out, etc.
   * connectors, not just CRTs).
   *
   * Each driver is responsible for filling out this structure at startup time,
   * in addition to providing other modesetting features, like i2c and DDC
   * bus accessors.
   */
  struct drm_crtc_funcs {
  	/* Save CRTC state */
  	void (*save)(struct drm_crtc *crtc); /* suspend? */
  	/* Restore CRTC state */
  	void (*restore)(struct drm_crtc *crtc); /* resume? */
  	/* Reset CRTC state */
  	void (*reset)(struct drm_crtc *crtc);
  
  	/* cursor controls */
  	int (*cursor_set)(struct drm_crtc *crtc, struct drm_file *file_priv,
  			  uint32_t handle, uint32_t width, uint32_t height);
  	int (*cursor_set2)(struct drm_crtc *crtc, struct drm_file *file_priv,
  			   uint32_t handle, uint32_t width, uint32_t height,
  			   int32_t hot_x, int32_t hot_y);
  	int (*cursor_move)(struct drm_crtc *crtc, int x, int y);
  
  	/* Set gamma on the CRTC */
  	void (*gamma_set)(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
  			  uint32_t start, uint32_t size);
  	/* Object destroy routine */
  	void (*destroy)(struct drm_crtc *crtc);
  
  	int (*set_config)(struct drm_mode_set *set);
  
  	/*
  	 * Flip to the given framebuffer.  This implements the page
  	 * flip ioctl described in drm_mode.h, specifically, the
  	 * implementation must return immediately and block all
  	 * rendering to the current fb until the flip has completed.
  	 * If userspace set the event flag in the ioctl, the event
  	 * argument will point to an event to send back when the flip
  	 * completes, otherwise it will be NULL.
  	 */
  	int (*page_flip)(struct drm_crtc *crtc,
  			 struct drm_framebuffer *fb,
  			 struct drm_pending_vblank_event *event,
  			 uint32_t flags);
  
  	int (*set_property)(struct drm_crtc *crtc,
  			    struct drm_property *property, uint64_t val);
  
  	/* atomic update handling */
  	struct drm_crtc_state *(*atomic_duplicate_state)(struct drm_crtc *crtc);
  	void (*atomic_destroy_state)(struct drm_crtc *crtc,
  				     struct drm_crtc_state *state);
  	int (*atomic_set_property)(struct drm_crtc *crtc,
  				   struct drm_crtc_state *state,
  				   struct drm_property *property,
  				   uint64_t val);
  	int (*atomic_get_property)(struct drm_crtc *crtc,
  				   const struct drm_crtc_state *state,
  				   struct drm_property *property,
  				   uint64_t *val);
  };
  
  /**
   * struct drm_crtc - central CRTC control structure
   * @dev: parent DRM device
   * @port: OF node used by drm_of_find_possible_crtcs()
   * @head: list management
   * @mutex: per-CRTC locking
   * @base: base KMS object for ID tracking etc.
   * @primary: primary plane for this CRTC
   * @cursor: cursor plane for this CRTC
   * @cursor_x: current x position of the cursor, used for universal cursor planes
   * @cursor_y: current y position of the cursor, used for universal cursor planes
   * @enabled: is this CRTC enabled?
   * @mode: current mode timings
   * @hwmode: mode timings as programmed to hw regs
   * @x: x position on screen
   * @y: y position on screen
   * @funcs: CRTC control functions
   * @gamma_size: size of gamma ramp
   * @gamma_store: gamma ramp values
   * @helper_private: mid-layer private data
   * @properties: property tracking for this CRTC
   * @state: current atomic state for this CRTC
   * @acquire_ctx: per-CRTC implicit acquire context used by atomic drivers for
   * 	legacy ioctls
   *
   * Each CRTC may have one or more connectors associated with it.  This structure
   * allows the CRTC to be controlled.
   */
  struct drm_crtc {
  	struct drm_device *dev;
  	struct device_node *port;
  	struct list_head head;
  
  	/*
  	 * crtc mutex
  	 *
  	 * This provides a read lock for the overall crtc state (mode, dpms
  	 * state, ...) and a write lock for everything which can be update
  	 * without a full modeset (fb, cursor data, ...)
  	 */
  	struct drm_modeset_lock mutex;
  
  	struct drm_mode_object base;
  
  	/* primary and cursor planes for CRTC */
  	struct drm_plane *primary;
  	struct drm_plane *cursor;
  
  	/* position of cursor plane on crtc */
  	int cursor_x;
  	int cursor_y;
  
  	bool enabled;
  
  	/* Requested mode from modesetting. */
  	struct drm_display_mode mode;
  
  	/* Programmed mode in hw, after adjustments for encoders,
  	 * crtc, panel scaling etc. Needed for timestamping etc.
  	 */
  	struct drm_display_mode hwmode;
  
  	int x, y;
  	const struct drm_crtc_funcs *funcs;
  
  	/* Legacy FB CRTC gamma size for reporting to userspace */
  	uint32_t gamma_size;
  	uint16_t *gamma_store;
  
  	/* if you are using the helper */
  	const void *helper_private;
  
  	struct drm_object_properties properties;
  
  	struct drm_crtc_state *state;
  
  	/*
  	 * For legacy crtc ioctls so that atomic drivers can get at the locking
  	 * acquire context.
  	 */
  	struct drm_modeset_acquire_ctx *acquire_ctx;
  };
  
  /**
   * struct drm_connector_state - mutable connector state
   * @connector: backpointer to the connector
   * @crtc: CRTC to connect connector to, NULL if disabled
   * @best_encoder: can be used by helpers and drivers to select the encoder
   * @state: backpointer to global drm_atomic_state
   */
  struct drm_connector_state {
  	struct drm_connector *connector;
  
  	struct drm_crtc *crtc;  /* do not write directly, use drm_atomic_set_crtc_for_connector() */
  
  	struct drm_encoder *best_encoder;
  
  	struct drm_atomic_state *state;
  };
  
  /**
   * struct drm_connector_funcs - control connectors on a given device
   * @dpms: set power state
   * @save: save connector state
   * @restore: restore connector state
   * @reset: reset connector after state has been invalidated (e.g. resume)
   * @detect: is this connector active?
   * @fill_modes: fill mode list for this connector
   * @set_property: property for this connector may need an update
   * @destroy: make object go away
   * @force: notify the driver that the connector is forced on
   * @atomic_duplicate_state: duplicate the atomic state for this connector
   * @atomic_destroy_state: destroy an atomic state for this connector
   * @atomic_set_property: set a property on an atomic state for this connector
   *    (do not call directly, use drm_atomic_connector_set_property())
   * @atomic_get_property: get a property on an atomic state for this connector
   *    (do not call directly, use drm_atomic_connector_get_property())
   *
   * Each CRTC may have one or more connectors attached to it.  The functions
   * below allow the core DRM code to control connectors, enumerate available modes,
   * etc.
   */
  struct drm_connector_funcs {
  	int (*dpms)(struct drm_connector *connector, int mode);
  	void (*save)(struct drm_connector *connector);
  	void (*restore)(struct drm_connector *connector);
  	void (*reset)(struct drm_connector *connector);
  
  	/* Check to see if anything is attached to the connector.
  	 * @force is set to false whilst polling, true when checking the
  	 * connector due to user request. @force can be used by the driver
  	 * to avoid expensive, destructive operations during automated
  	 * probing.
  	 */
  	enum drm_connector_status (*detect)(struct drm_connector *connector,
  					    bool force);
  	int (*fill_modes)(struct drm_connector *connector, uint32_t max_width, uint32_t max_height);
  	int (*set_property)(struct drm_connector *connector, struct drm_property *property,
  			     uint64_t val);
  	void (*destroy)(struct drm_connector *connector);
  	void (*force)(struct drm_connector *connector);
  
  	/* atomic update handling */
  	struct drm_connector_state *(*atomic_duplicate_state)(struct drm_connector *connector);
  	void (*atomic_destroy_state)(struct drm_connector *connector,
  				     struct drm_connector_state *state);
  	int (*atomic_set_property)(struct drm_connector *connector,
  				   struct drm_connector_state *state,
  				   struct drm_property *property,
  				   uint64_t val);
  	int (*atomic_get_property)(struct drm_connector *connector,
  				   const struct drm_connector_state *state,
  				   struct drm_property *property,
  				   uint64_t *val);
  };
  
  /**
   * struct drm_encoder_funcs - encoder controls
   * @reset: reset state (e.g. at init or resume time)
   * @destroy: cleanup and free associated data
   *
   * Encoders sit between CRTCs and connectors.
   */
  struct drm_encoder_funcs {
  	void (*reset)(struct drm_encoder *encoder);
  	void (*destroy)(struct drm_encoder *encoder);
  };
  
  #define DRM_CONNECTOR_MAX_ENCODER 3
  
  /**
   * struct drm_encoder - central DRM encoder structure
   * @dev: parent DRM device
   * @head: list management
   * @base: base KMS object
   * @name: encoder name
   * @encoder_type: one of the %DRM_MODE_ENCODER_<foo> types in drm_mode.h
   * @possible_crtcs: bitmask of potential CRTC bindings
   * @possible_clones: bitmask of potential sibling encoders for cloning
   * @crtc: currently bound CRTC
   * @bridge: bridge associated to the encoder
   * @funcs: control functions
   * @helper_private: mid-layer private data
   *
   * CRTCs drive pixels to encoders, which convert them into signals
   * appropriate for a given connector or set of connectors.
   */
  struct drm_encoder {
  	struct drm_device *dev;
  	struct list_head head;
  
  	struct drm_mode_object base;
  	char *name;
  	int encoder_type;
  	uint32_t possible_crtcs;
  	uint32_t possible_clones;
  
  	struct drm_crtc *crtc;
  	struct drm_bridge *bridge;
  	const struct drm_encoder_funcs *funcs;
  	const void *helper_private;
  };
  
  /* should we poll this connector for connects and disconnects */
  /* hot plug detectable */
  #define DRM_CONNECTOR_POLL_HPD (1 << 0)
  /* poll for connections */
  #define DRM_CONNECTOR_POLL_CONNECT (1 << 1)
  /* can cleanly poll for disconnections without flickering the screen */
  /* DACs should rarely do this without a lot of testing */
  #define DRM_CONNECTOR_POLL_DISCONNECT (1 << 2)
  
  #define MAX_ELD_BYTES	128
  
  /**
   * struct drm_connector - central DRM connector control structure
   * @dev: parent DRM device
   * @kdev: kernel device for sysfs attributes
   * @attr: sysfs attributes
   * @head: list management
   * @base: base KMS object
   * @name: connector name
   * @connector_type: one of the %DRM_MODE_CONNECTOR_<foo> types from drm_mode.h
   * @connector_type_id: index into connector type enum
   * @interlace_allowed: can this connector handle interlaced modes?
   * @doublescan_allowed: can this connector handle doublescan?
   * @stereo_allowed: can this connector handle stereo modes?
   * @modes: modes available on this connector (from fill_modes() + user)
   * @status: one of the drm_connector_status enums (connected, not, or unknown)
   * @probed_modes: list of modes derived directly from the display
   * @display_info: information about attached display (e.g. from EDID)
   * @funcs: connector control functions
   * @edid_blob_ptr: DRM property containing EDID if present
   * @properties: property tracking for this connector
   * @path_blob_ptr: DRM blob property data for the DP MST path property
   * @polled: a %DRM_CONNECTOR_POLL_<foo> value for core driven polling
   * @dpms: current dpms state
   * @helper_private: mid-layer private data
   * @cmdline_mode: mode line parsed from the kernel cmdline for this connector
   * @force: a %DRM_FORCE_<foo> state for forced mode sets
   * @override_edid: has the EDID been overwritten through debugfs for testing?
   * @encoder_ids: valid encoders for this connector
   * @encoder: encoder driving this connector, if any
   * @eld: EDID-like data, if present
   * @dvi_dual: dual link DVI, if found
   * @max_tmds_clock: max clock rate, if found
   * @latency_present: AV delay info from ELD, if found
   * @video_latency: video latency info from ELD, if found
   * @audio_latency: audio latency info from ELD, if found
   * @null_edid_counter: track sinks that give us all zeros for the EDID
   * @bad_edid_counter: track sinks that give us an EDID with invalid checksum
   * @edid_corrupt: indicates whether the last read EDID was corrupt
   * @debugfs_entry: debugfs directory for this connector
   * @state: current atomic state for this connector
   * @has_tile: is this connector connected to a tiled monitor
   * @tile_group: tile group for the connected monitor
   * @tile_is_single_monitor: whether the tile is one monitor housing
   * @num_h_tile: number of horizontal tiles in the tile group
   * @num_v_tile: number of vertical tiles in the tile group
   * @tile_h_loc: horizontal location of this tile
   * @tile_v_loc: vertical location of this tile
   * @tile_h_size: horizontal size of this tile.
   * @tile_v_size: vertical size of this tile.
   *
   * Each connector may be connected to one or more CRTCs, or may be clonable by
   * another connector if they can share a CRTC.  Each connector also has a specific
   * position in the broader display (referred to as a 'screen' though it could
   * span multiple monitors).
   */
  struct drm_connector {
  	struct drm_device *dev;
  	struct device *kdev;
  	struct device_attribute *attr;
  	struct list_head head;
  
  	struct drm_mode_object base;
  
  	char *name;
  	int connector_type;
  	int connector_type_id;
  	bool interlace_allowed;
  	bool doublescan_allowed;
  	bool stereo_allowed;
  	struct list_head modes; /* list of modes on this connector */
  
  	enum drm_connector_status status;
  
  	/* these are modes added by probing with DDC or the BIOS */
  	struct list_head probed_modes;
  
  	struct drm_display_info display_info;
  	const struct drm_connector_funcs *funcs;
  
  	struct drm_property_blob *edid_blob_ptr;
  	struct drm_object_properties properties;
  
  	struct drm_property_blob *path_blob_ptr;
  
  	struct drm_property_blob *tile_blob_ptr;
  
  	uint8_t polled; /* DRM_CONNECTOR_POLL_* */
  
  	/* requested DPMS state */
  	int dpms;
  
  	const void *helper_private;
  
  	/* forced on connector */
  	struct drm_cmdline_mode cmdline_mode;
  	enum drm_connector_force force;
  	bool override_edid;
  	uint32_t encoder_ids[DRM_CONNECTOR_MAX_ENCODER];
  	struct drm_encoder *encoder; /* currently active encoder */
  
  	/* EDID bits */
  	uint8_t eld[MAX_ELD_BYTES];
  	bool dvi_dual;
  	int max_tmds_clock;	/* in MHz */
  	bool latency_present[2];
  	int video_latency[2];	/* [0]: progressive, [1]: interlaced */
  	int audio_latency[2];
  	int null_edid_counter; /* needed to workaround some HW bugs where we get all 0s */
  	unsigned bad_edid_counter;
  
  	/* Flag for raw EDID header corruption - used in Displayport
  	 * compliance testing - * Displayport Link CTS Core 1.2 rev1.1 4.2.2.6
  	 */
  	bool edid_corrupt;
  
  	struct dentry *debugfs_entry;
  
  	struct drm_connector_state *state;
  
  	/* DisplayID bits */
  	bool has_tile;
  	struct drm_tile_group *tile_group;
  	bool tile_is_single_monitor;
  
  	uint8_t num_h_tile, num_v_tile;
  	uint8_t tile_h_loc, tile_v_loc;
  	uint16_t tile_h_size, tile_v_size;
  };
  
  /**
   * struct drm_plane_state - mutable plane state
   * @plane: backpointer to the plane
   * @crtc: currently bound CRTC, NULL if disabled
   * @fb: currently bound framebuffer
   * @fence: optional fence to wait for before scanning out @fb
   * @crtc_x: left position of visible portion of plane on crtc
   * @crtc_y: upper position of visible portion of plane on crtc
   * @crtc_w: width of visible portion of plane on crtc
   * @crtc_h: height of visible portion of plane on crtc
   * @src_x: left position of visible portion of plane within
   *	plane (in 16.16)
   * @src_y: upper position of visible portion of plane within
   *	plane (in 16.16)
   * @src_w: width of visible portion of plane (in 16.16)
   * @src_h: height of visible portion of plane (in 16.16)
   * @state: backpointer to global drm_atomic_state
   */
  struct drm_plane_state {
  	struct drm_plane *plane;
  
  	struct drm_crtc *crtc;   /* do not write directly, use drm_atomic_set_crtc_for_plane() */
  	struct drm_framebuffer *fb;  /* do not write directly, use drm_atomic_set_fb_for_plane() */
  	struct fence *fence;
  
  	/* Signed dest location allows it to be partially off screen */
  	int32_t crtc_x, crtc_y;
  	uint32_t crtc_w, crtc_h;
  
  	/* Source values are 16.16 fixed point */
  	uint32_t src_x, src_y;
  	uint32_t src_h, src_w;
  
  	/* Plane rotation */
  	unsigned int rotation;
  
  	struct drm_atomic_state *state;
  };
  
  
  /**
   * struct drm_plane_funcs - driver plane control functions
   * @update_plane: update the plane configuration
   * @disable_plane: shut down the plane
   * @destroy: clean up plane resources
   * @reset: reset plane after state has been invalidated (e.g. resume)
   * @set_property: called when a property is changed
   * @atomic_duplicate_state: duplicate the atomic state for this plane
   * @atomic_destroy_state: destroy an atomic state for this plane
   * @atomic_set_property: set a property on an atomic state for this plane
   *    (do not call directly, use drm_atomic_plane_set_property())
   * @atomic_get_property: get a property on an atomic state for this plane
   *    (do not call directly, use drm_atomic_plane_get_property())
   */
  struct drm_plane_funcs {
  	int (*update_plane)(struct drm_plane *plane,
  			    struct drm_crtc *crtc, struct drm_framebuffer *fb,
  			    int crtc_x, int crtc_y,
  			    unsigned int crtc_w, unsigned int crtc_h,
  			    uint32_t src_x, uint32_t src_y,
  			    uint32_t src_w, uint32_t src_h);
  	int (*disable_plane)(struct drm_plane *plane);
  	void (*destroy)(struct drm_plane *plane);
  	void (*reset)(struct drm_plane *plane);
  
  	int (*set_property)(struct drm_plane *plane,
  			    struct drm_property *property, uint64_t val);
  
  	/* atomic update handling */
  	struct drm_plane_state *(*atomic_duplicate_state)(struct drm_plane *plane);
  	void (*atomic_destroy_state)(struct drm_plane *plane,
  				     struct drm_plane_state *state);
  	int (*atomic_set_property)(struct drm_plane *plane,
  				   struct drm_plane_state *state,
  				   struct drm_property *property,
  				   uint64_t val);
  	int (*atomic_get_property)(struct drm_plane *plane,
  				   const struct drm_plane_state *state,
  				   struct drm_property *property,
  				   uint64_t *val);
  };
  
  enum drm_plane_type {
  	DRM_PLANE_TYPE_OVERLAY,
  	DRM_PLANE_TYPE_PRIMARY,
  	DRM_PLANE_TYPE_CURSOR,
  };
  
  /**
   * struct drm_plane - central DRM plane control structure
   * @dev: DRM device this plane belongs to
   * @head: for list management
   * @base: base mode object
   * @possible_crtcs: pipes this plane can be bound to
   * @format_types: array of formats supported by this plane
   * @format_count: number of formats supported
   * @format_default: driver hasn't supplied supported formats for the plane
   * @crtc: currently bound CRTC
   * @fb: currently bound fb
   * @old_fb: Temporary tracking of the old fb while a modeset is ongoing. Used by
   * 	drm_mode_set_config_internal() to implement correct refcounting.
   * @funcs: helper functions
   * @properties: property tracking for this plane
   * @type: type of plane (overlay, primary, cursor)
   * @state: current atomic state for this plane
   */
  struct drm_plane {
  	struct drm_device *dev;
  	struct list_head head;
  
  	struct drm_modeset_lock mutex;
  
  	struct drm_mode_object base;
  
  	uint32_t possible_crtcs;
  	uint32_t *format_types;
  	unsigned int format_count;
  	bool format_default;
  
  	struct drm_crtc *crtc;
  	struct drm_framebuffer *fb;
  
  	struct drm_framebuffer *old_fb;
  
  	const struct drm_plane_funcs *funcs;
  
  	struct drm_object_properties properties;
  
  	enum drm_plane_type type;
  
  	const void *helper_private;
  
  	struct drm_plane_state *state;
  };
  
  /**
   * struct drm_bridge_funcs - drm_bridge control functions
   * @attach: Called during drm_bridge_attach
   * @mode_fixup: Try to fixup (or reject entirely) proposed mode for this bridge
   * @disable: Called right before encoder prepare, disables the bridge
   * @post_disable: Called right after encoder prepare, for lockstepped disable
   * @mode_set: Set this mode to the bridge
   * @pre_enable: Called right before encoder commit, for lockstepped commit
   * @enable: Called right after encoder commit, enables the bridge
   */
  struct drm_bridge_funcs {
  	int (*attach)(struct drm_bridge *bridge);
  	bool (*mode_fixup)(struct drm_bridge *bridge,
  			   const struct drm_display_mode *mode,
  			   struct drm_display_mode *adjusted_mode);
  	void (*disable)(struct drm_bridge *bridge);
  	void (*post_disable)(struct drm_bridge *bridge);
  	void (*mode_set)(struct drm_bridge *bridge,
  			 struct drm_display_mode *mode,
  			 struct drm_display_mode *adjusted_mode);
  	void (*pre_enable)(struct drm_bridge *bridge);
  	void (*enable)(struct drm_bridge *bridge);
  };
  
  /**
   * struct drm_bridge - central DRM bridge control structure
   * @dev: DRM device this bridge belongs to
   * @encoder: encoder to which this bridge is connected
   * @next: the next bridge in the encoder chain
   * @of_node: device node pointer to the bridge
   * @list: to keep track of all added bridges
   * @funcs: control functions
   * @driver_private: pointer to the bridge driver's internal context
   */
  struct drm_bridge {
  	struct drm_device *dev;
  	struct drm_encoder *encoder;
  	struct drm_bridge *next;
  #ifdef CONFIG_OF
  	struct device_node *of_node;
  #endif
  	struct list_head list;
  
  	const struct drm_bridge_funcs *funcs;
  	void *driver_private;
  };
  
  /**
   * struct drm_atomic_state - the global state object for atomic updates
   * @dev: parent DRM device
   * @allow_modeset: allow full modeset
   * @legacy_cursor_update: hint to enforce legacy cursor ioctl semantics
   * @planes: pointer to array of plane pointers
   * @plane_states: pointer to array of plane states pointers
   * @crtcs: pointer to array of CRTC pointers
   * @crtc_states: pointer to array of CRTC states pointers
   * @num_connector: size of the @connectors and @connector_states arrays
   * @connectors: pointer to array of connector pointers
   * @connector_states: pointer to array of connector states pointers
   * @acquire_ctx: acquire context for this atomic modeset state update
   */
  struct drm_atomic_state {
  	struct drm_device *dev;
  	bool allow_modeset : 1;
  	bool legacy_cursor_update : 1;
  	struct drm_plane **planes;
  	struct drm_plane_state **plane_states;
  	struct drm_crtc **crtcs;
  	struct drm_crtc_state **crtc_states;
  	int num_connector;
  	struct drm_connector **connectors;
  	struct drm_connector_state **connector_states;
  
  	struct drm_modeset_acquire_ctx *acquire_ctx;
  };
  
  
  /**
   * struct drm_mode_set - new values for a CRTC config change
   * @fb: framebuffer to use for new config
   * @crtc: CRTC whose configuration we're about to change
   * @mode: mode timings to use
   * @x: position of this CRTC relative to @fb
   * @y: position of this CRTC relative to @fb
   * @connectors: array of connectors to drive with this CRTC if possible
   * @num_connectors: size of @connectors array
   *
   * Represents a single crtc the connectors that it drives with what mode
   * and from which framebuffer it scans out from.
   *
   * This is used to set modes.
   */
  struct drm_mode_set {
  	struct drm_framebuffer *fb;
  	struct drm_crtc *crtc;
  	struct drm_display_mode *mode;
  
  	uint32_t x;
  	uint32_t y;
  
  	struct drm_connector **connectors;
  	size_t num_connectors;
  };
  
  /**
   * struct drm_mode_config_funcs - basic driver provided mode setting functions
   * @fb_create: create a new framebuffer object
   * @output_poll_changed: function to handle output configuration changes
   * @atomic_check: check whether a given atomic state update is possible
   * @atomic_commit: commit an atomic state update previously verified with
   * 	atomic_check()
   * @atomic_state_alloc: allocate a new atomic state
   * @atomic_state_clear: clear the atomic state
   * @atomic_state_free: free the atomic state
   *
   * Some global (i.e. not per-CRTC, connector, etc) mode setting functions that
   * involve drivers.
   */
  struct drm_mode_config_funcs {
  	struct drm_framebuffer *(*fb_create)(struct drm_device *dev,
  					     struct drm_file *file_priv,
  					     struct drm_mode_fb_cmd2 *mode_cmd);
  	void (*output_poll_changed)(struct drm_device *dev);
  
  	int (*atomic_check)(struct drm_device *dev,
  			    struct drm_atomic_state *a);
  	int (*atomic_commit)(struct drm_device *dev,
  			     struct drm_atomic_state *a,
  			     bool async);
  	struct drm_atomic_state *(*atomic_state_alloc)(struct drm_device *dev);
  	void (*atomic_state_clear)(struct drm_atomic_state *state);
  	void (*atomic_state_free)(struct drm_atomic_state *state);
  };
  
  /**
   * struct drm_mode_config - Mode configuration control structure
   * @mutex: mutex protecting KMS related lists and structures
   * @connection_mutex: ww mutex protecting connector state and routing
   * @acquire_ctx: global implicit acquire context used by atomic drivers for
   * 	legacy ioctls
   * @idr_mutex: mutex for KMS ID allocation and management
   * @crtc_idr: main KMS ID tracking object
   * @fb_lock: mutex to protect fb state and lists
   * @num_fb: number of fbs available
   * @fb_list: list of framebuffers available
   * @num_connector: number of connectors on this device
   * @connector_list: list of connector objects
   * @num_encoder: number of encoders on this device
   * @encoder_list: list of encoder objects
   * @num_overlay_plane: number of overlay planes on this device
   * @num_total_plane: number of universal (i.e. with primary/curso) planes on this device
   * @plane_list: list of plane objects
   * @num_crtc: number of CRTCs on this device
   * @crtc_list: list of CRTC objects
   * @property_list: list of property objects
   * @min_width: minimum pixel width on this device
   * @min_height: minimum pixel height on this device
   * @max_width: maximum pixel width on this device
   * @max_height: maximum pixel height on this device
   * @funcs: core driver provided mode setting functions
   * @fb_base: base address of the framebuffer
   * @poll_enabled: track polling support for this device
   * @poll_running: track polling status for this device
   * @output_poll_work: delayed work for polling in process context
   * @property_blob_list: list of all the blob property objects
   * @blob_lock: mutex for blob property allocation and management
   * @*_property: core property tracking
   * @degamma_lut_property: LUT used to convert the framebuffer's colors to linear
   *	gamma
   * @degamma_lut_size_property: size of the degamma LUT as supported by the
   *	driver (read-only)
   * @ctm_property: Matrix used to convert colors after the lookup in the
   *	degamma LUT
   * @gamma_lut_property: LUT used to convert the colors, after the CSC matrix, to
   *	the gamma space of the connected screen (read-only)
   * @gamma_lut_size_property: size of the gamma LUT as supported by the driver
   * @preferred_depth: preferred RBG pixel depth, used by fb helpers
   * @prefer_shadow: hint to userspace to prefer shadow-fb rendering
   * @async_page_flip: does this device support async flips on the primary plane?
   * @cursor_width: hint to userspace for max cursor width
   * @cursor_height: hint to userspace for max cursor height
   *
   * Core mode resource tracking structure.  All CRTC, encoders, and connectors
   * enumerated by the driver are added here, as are global properties.  Some
   * global restrictions are also here, e.g. dimension restrictions.
   */
  struct drm_mode_config {
  	struct mutex mutex; /* protects configuration (mode lists etc.) */
  	struct drm_modeset_lock connection_mutex; /* protects connector->encoder and encoder->crtc links */
  	struct drm_modeset_acquire_ctx *acquire_ctx; /* for legacy _lock_all() / _unlock_all() */
  	struct mutex idr_mutex; /* for IDR management */
  	struct idr crtc_idr; /* use this idr for all IDs, fb, crtc, connector, modes - just makes life easier */
  	struct idr tile_idr; /* use this idr for all IDs, fb, crtc, connector, modes - just makes life easier */
  	/* this is limited to one for now */
  
  	struct mutex fb_lock; /* proctects global and per-file fb lists */
  	int num_fb;
  	struct list_head fb_list;
  
  	int num_connector;
  	struct list_head connector_list;
  	int num_encoder;
  	struct list_head encoder_list;
  
  	/*
  	 * Track # of overlay planes separately from # of total planes.  By
  	 * default we only advertise overlay planes to userspace; if userspace
  	 * sets the "universal plane" capability bit, we'll go ahead and
  	 * expose all planes.
  	 */
  	int num_overlay_plane;
  	int num_total_plane;
  	struct list_head plane_list;
  
  	int num_crtc;
  	struct list_head crtc_list;
  
  	struct list_head property_list;
  
  	int min_width, min_height;
  	int max_width, max_height;
  	const struct drm_mode_config_funcs *funcs;
  	resource_size_t fb_base;
  
  	/* output poll support */
  	bool poll_enabled;
  	bool poll_running;
  	bool delayed_event;
  	struct delayed_work output_poll_work;
  
  	struct mutex blob_lock;
  
  	/* pointers to standard properties */
  	struct list_head property_blob_list;
  	struct drm_property *edid_property;
  	struct drm_property *dpms_property;
  	struct drm_property *path_property;
  	struct drm_property *tile_property;
  	struct drm_property *plane_type_property;
  	struct drm_property *rotation_property;
  	struct drm_property *prop_src_x;
  	struct drm_property *prop_src_y;
  	struct drm_property *prop_src_w;
  	struct drm_property *prop_src_h;
  	struct drm_property *prop_crtc_x;
  	struct drm_property *prop_crtc_y;
  	struct drm_property *prop_crtc_w;
  	struct drm_property *prop_crtc_h;
  	struct drm_property *prop_fb_id;
  	struct drm_property *prop_crtc_id;
  	struct drm_property *prop_active;
  	struct drm_property *prop_mode_id;
  
  	/* DVI-I properties */
  	struct drm_property *dvi_i_subconnector_property;
  	struct drm_property *dvi_i_select_subconnector_property;
  
  	/* TV properties */
  	struct drm_property *tv_subconnector_property;
  	struct drm_property *tv_select_subconnector_property;
  	struct drm_property *tv_mode_property;
  	struct drm_property *tv_left_margin_property;
  	struct drm_property *tv_right_margin_property;
  	struct drm_property *tv_top_margin_property;
  	struct drm_property *tv_bottom_margin_property;
  	struct drm_property *tv_brightness_property;
  	struct drm_property *tv_contrast_property;
  	struct drm_property *tv_flicker_reduction_property;
  	struct drm_property *tv_overscan_property;
  	struct drm_property *tv_saturation_property;
  	struct drm_property *tv_hue_property;
  
  	/* Optional properties */
  	struct drm_property *scaling_mode_property;
  	struct drm_property *aspect_ratio_property;
  	struct drm_property *dirty_info_property;
  
  	/* Optional color correction properties */
  	struct drm_property *degamma_lut_property;
  	struct drm_property *degamma_lut_size_property;
  	struct drm_property *ctm_property;
  	struct drm_property *gamma_lut_property;
  	struct drm_property *gamma_lut_size_property;
  
  	/* properties for virtual machine layout */
  	struct drm_property *suggested_x_property;
  	struct drm_property *suggested_y_property;
  
  	/* dumb ioctl parameters */
  	uint32_t preferred_depth, prefer_shadow;
  
  	/* whether async page flip is supported or not */
  	bool async_page_flip;
  
  	/* whether the driver supports fb modifiers */
  	bool allow_fb_modifiers;
  
  	/* cursor size */
  	uint32_t cursor_width, cursor_height;
  };
  
  /**
   * drm_for_each_plane_mask - iterate over planes specified by bitmask
   * @plane: the loop cursor
   * @dev: the DRM device
   * @plane_mask: bitmask of plane indices
   *
   * Iterate over all planes specified by bitmask.
   */
  #define drm_for_each_plane_mask(plane, dev, plane_mask) \
  	list_for_each_entry((plane), &(dev)->mode_config.plane_list, head) \
  		if ((plane_mask) & (1 << drm_plane_index(plane)))
  
  
  #define obj_to_crtc(x) container_of(x, struct drm_crtc, base)
  #define obj_to_connector(x) container_of(x, struct drm_connector, base)
  #define obj_to_encoder(x) container_of(x, struct drm_encoder, base)
  #define obj_to_mode(x) container_of(x, struct drm_display_mode, base)
  #define obj_to_fb(x) container_of(x, struct drm_framebuffer, base)
  #define obj_to_property(x) container_of(x, struct drm_property, base)
  #define obj_to_blob(x) container_of(x, struct drm_property_blob, base)
  #define obj_to_plane(x) container_of(x, struct drm_plane, base)
  
  struct drm_prop_enum_list {
  	int type;
  	char *name;
  };
  
  extern int drm_crtc_init_with_planes(struct drm_device *dev,
  				     struct drm_crtc *crtc,
  				     struct drm_plane *primary,
  				     struct drm_plane *cursor,
  				     const struct drm_crtc_funcs *funcs);
  extern void drm_crtc_cleanup(struct drm_crtc *crtc);
  extern unsigned int drm_crtc_index(struct drm_crtc *crtc);
  
  /**
   * drm_crtc_mask - find the mask of a registered CRTC
   * @crtc: CRTC to find mask for
   *
   * Given a registered CRTC, return the mask bit of that CRTC for an
   * encoder's possible_crtcs field.
   */
  static inline uint32_t drm_crtc_mask(struct drm_crtc *crtc)
  {
  	return 1 << drm_crtc_index(crtc);
  }
  
  extern void drm_connector_ida_init(void);
  extern void drm_connector_ida_destroy(void);
  extern int drm_connector_init(struct drm_device *dev,
  			      struct drm_connector *connector,
  			      const struct drm_connector_funcs *funcs,
  			      int connector_type);
  int drm_connector_register(struct drm_connector *connector);
  void drm_connector_unregister(struct drm_connector *connector);
  
  extern void drm_connector_cleanup(struct drm_connector *connector);
  extern unsigned int drm_connector_index(struct drm_connector *connector);
  /* helper to unplug all connectors from sysfs for device */
  extern void drm_connector_unplug_all(struct drm_device *dev);
  
  extern int drm_bridge_add(struct drm_bridge *bridge);
  extern void drm_bridge_remove(struct drm_bridge *bridge);
  extern struct drm_bridge *of_drm_find_bridge(struct device_node *np);
  extern int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge);
  
  bool drm_bridge_mode_fixup(struct drm_bridge *bridge,
  			const struct drm_display_mode *mode,
  			struct drm_display_mode *adjusted_mode);
  void drm_bridge_disable(struct drm_bridge *bridge);
  void drm_bridge_post_disable(struct drm_bridge *bridge);
  void drm_bridge_mode_set(struct drm_bridge *bridge,
  			struct drm_display_mode *mode,
  			struct drm_display_mode *adjusted_mode);
  void drm_bridge_pre_enable(struct drm_bridge *bridge);
  void drm_bridge_enable(struct drm_bridge *bridge);
  
  extern int drm_encoder_init(struct drm_device *dev,
  			    struct drm_encoder *encoder,
  			    const struct drm_encoder_funcs *funcs,
  			    int encoder_type);
  
  /**
   * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
   * @encoder: encoder to test
   * @crtc: crtc to test
   *
   * Return false if @encoder can't be driven by @crtc, true otherwise.
   */
  static inline bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
  				       struct drm_crtc *crtc)
  {
  	return !!(encoder->possible_crtcs & drm_crtc_mask(crtc));
  }
  
  extern int drm_universal_plane_init(struct drm_device *dev,
  				    struct drm_plane *plane,
  				    unsigned long possible_crtcs,
  				    const struct drm_plane_funcs *funcs,
  				    const uint32_t *formats,
  				    unsigned int format_count,
  				    enum drm_plane_type type);
  extern int drm_plane_init(struct drm_device *dev,
  			  struct drm_plane *plane,
  			  unsigned long possible_crtcs,
  			  const struct drm_plane_funcs *funcs,
  			  const uint32_t *formats, unsigned int format_count,
  			  bool is_primary);
  extern void drm_plane_cleanup(struct drm_plane *plane);
  extern unsigned int drm_plane_index(struct drm_plane *plane);
  extern struct drm_plane * drm_plane_from_index(struct drm_device *dev, int idx);
  extern void drm_plane_force_disable(struct drm_plane *plane);
  extern int drm_plane_check_pixel_format(const struct drm_plane *plane,
  					u32 format);
  extern void drm_crtc_get_hv_timing(const struct drm_display_mode *mode,
  				   int *hdisplay, int *vdisplay);
  extern int drm_crtc_check_viewport(const struct drm_crtc *crtc,
  				   int x, int y,
  				   const struct drm_display_mode *mode,
  				   const struct drm_framebuffer *fb);
  
  extern void drm_encoder_cleanup(struct drm_encoder *encoder);
  
  extern const char *drm_get_connector_status_name(enum drm_connector_status status);
  extern const char *drm_get_subpixel_order_name(enum subpixel_order order);
  extern const char *drm_get_dpms_name(int val);
  extern const char *drm_get_dvi_i_subconnector_name(int val);
  extern const char *drm_get_dvi_i_select_name(int val);
  extern const char *drm_get_tv_subconnector_name(int val);
  extern const char *drm_get_tv_select_name(int val);
  extern void drm_fb_release(struct drm_file *file_priv);
  extern void drm_property_destroy_user_blobs(struct drm_device *dev,
                                              struct drm_file *file_priv);
  extern bool drm_probe_ddc(struct i2c_adapter *adapter);
  extern struct edid *drm_get_edid(struct drm_connector *connector,
  				 struct i2c_adapter *adapter);
  extern struct edid *drm_edid_duplicate(const struct edid *edid);
  extern int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid);
  extern void drm_mode_config_init(struct drm_device *dev);
  extern void drm_mode_config_reset(struct drm_device *dev);
  extern void drm_mode_config_cleanup(struct drm_device *dev);
  
  extern int drm_mode_connector_set_path_property(struct drm_connector *connector,
  						const char *path);
  int drm_mode_connector_set_tile_property(struct drm_connector *connector);
  extern int drm_mode_connector_update_edid_property(struct drm_connector *connector,
  						   const struct edid *edid);
  
  extern int drm_display_info_set_bus_formats(struct drm_display_info *info,
  					    const u32 *formats,
  					    unsigned int num_formats);
  
  static inline bool drm_property_type_is(struct drm_property *property,
  		uint32_t type)
  {
  	/* instanceof for props.. handles extended type vs original types: */
  	if (property->flags & DRM_MODE_PROP_EXTENDED_TYPE)
  		return (property->flags & DRM_MODE_PROP_EXTENDED_TYPE) == type;
  	return property->flags & type;
  }
  
  static inline bool drm_property_type_valid(struct drm_property *property)
  {
  	if (property->flags & DRM_MODE_PROP_EXTENDED_TYPE)
  		return !(property->flags & DRM_MODE_PROP_LEGACY_TYPE);
  	return !!(property->flags & DRM_MODE_PROP_LEGACY_TYPE);
  }
  
  extern int drm_object_property_set_value(struct drm_mode_object *obj,
  					 struct drm_property *property,
  					 uint64_t val);
  extern int drm_object_property_get_value(struct drm_mode_object *obj,
  					 struct drm_property *property,
  					 uint64_t *value);
  extern int drm_framebuffer_init(struct drm_device *dev,
  				struct drm_framebuffer *fb,
  				const struct drm_framebuffer_funcs *funcs);
  extern struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
  						      uint32_t id);
  extern void drm_framebuffer_unreference(struct drm_framebuffer *fb);
  extern void drm_framebuffer_reference(struct drm_framebuffer *fb);
  extern void drm_framebuffer_remove(struct drm_framebuffer *fb);
  extern void drm_framebuffer_cleanup(struct drm_framebuffer *fb);
  extern void drm_framebuffer_unregister_private(struct drm_framebuffer *fb);
  
  extern void drm_object_attach_property(struct drm_mode_object *obj,
  				       struct drm_property *property,
  				       uint64_t init_val);
  extern struct drm_property *drm_property_create(struct drm_device *dev, int flags,
  						const char *name, int num_values);
  extern struct drm_property *drm_property_create_enum(struct drm_device *dev, int flags,
  					 const char *name,
  					 const struct drm_prop_enum_list *props,
  					 int num_values);
  struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
  					 int flags, const char *name,
  					 const struct drm_prop_enum_list *props,
  					 int num_props,
  					 uint64_t supported_bits);
  struct drm_property *drm_property_create_range(struct drm_device *dev, int flags,
  					 const char *name,
  					 uint64_t min, uint64_t max);
  struct drm_property *drm_property_create_signed_range(struct drm_device *dev,
  					 int flags, const char *name,
  					 int64_t min, int64_t max);
  struct drm_property *drm_property_create_object(struct drm_device *dev,
  					 int flags, const char *name, uint32_t type);
  struct drm_property *drm_property_create_bool(struct drm_device *dev, int flags,
  					 const char *name);
  struct drm_property_blob *drm_property_create_blob(struct drm_device *dev,
                                                     size_t length,
                                                     const void *data);
  struct drm_property_blob *drm_property_lookup_blob(struct drm_device *dev,
                                                     uint32_t id);
  struct drm_property_blob *drm_property_reference_blob(struct drm_property_blob *blob);
  void drm_property_unreference_blob(struct drm_property_blob *blob);
  extern void drm_property_destroy(struct drm_device *dev, struct drm_property *property);
  extern int drm_property_add_enum(struct drm_property *property, int index,
  				 uint64_t value, const char *name);
  extern int drm_mode_create_dvi_i_properties(struct drm_device *dev);
  extern int drm_mode_create_tv_properties(struct drm_device *dev,
  					 unsigned int num_modes,
  					 const char * const modes[]);
  extern int drm_mode_create_scaling_mode_property(struct drm_device *dev);
  extern int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
  extern int drm_mode_create_dirty_info_property(struct drm_device *dev);
  extern int drm_mode_create_suggested_offset_properties(struct drm_device *dev);
  extern bool drm_property_change_valid_get(struct drm_property *property,
  					 uint64_t value, struct drm_mode_object **ref);
  extern void drm_property_change_valid_put(struct drm_property *property,
  		struct drm_mode_object *ref);
  
  extern int drm_mode_connector_attach_encoder(struct drm_connector *connector,
  					     struct drm_encoder *encoder);
  extern int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
  					 int gamma_size);
  extern struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
  		uint32_t id, uint32_t type);
  
  /* IOCTLs */
  extern int drm_mode_getresources(struct drm_device *dev,
  				 void *data, struct drm_file *file_priv);
  extern int drm_mode_getplane_res(struct drm_device *dev, void *data,
  				   struct drm_file *file_priv);
  extern int drm_mode_getcrtc(struct drm_device *dev,
  			    void *data, struct drm_file *file_priv);
  extern int drm_mode_getconnector(struct drm_device *dev,
  			      void *data, struct drm_file *file_priv);
  extern int drm_mode_set_config_internal(struct drm_mode_set *set);
  extern int drm_mode_setcrtc(struct drm_device *dev,
  			    void *data, struct drm_file *file_priv);
  extern int drm_mode_getplane(struct drm_device *dev,
  			       void *data, struct drm_file *file_priv);
  extern int drm_mode_setplane(struct drm_device *dev,
  			       void *data, struct drm_file *file_priv);
  extern int drm_mode_cursor_ioctl(struct drm_device *dev,
  				void *data, struct drm_file *file_priv);
  extern int drm_mode_cursor2_ioctl(struct drm_device *dev,
  				void *data, struct drm_file *file_priv);
  extern int drm_mode_addfb(struct drm_device *dev,
  			  void *data, struct drm_file *file_priv);
  extern int drm_mode_addfb2(struct drm_device *dev,
  			   void *data, struct drm_file *file_priv);
  extern uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth);
  extern int drm_mode_rmfb(struct drm_device *dev,
  			 void *data, struct drm_file *file_priv);
  extern int drm_mode_getfb(struct drm_device *dev,
  			  void *data, struct drm_file *file_priv);
  extern int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
  				  void *data, struct drm_file *file_priv);
  
  extern int drm_mode_getproperty_ioctl(struct drm_device *dev,
  				      void *data, struct drm_file *file_priv);
  extern int drm_mode_getblob_ioctl(struct drm_device *dev,
  				  void *data, struct drm_file *file_priv);
  extern int drm_mode_createblob_ioctl(struct drm_device *dev,
  				     void *data, struct drm_file *file_priv);
  extern int drm_mode_destroyblob_ioctl(struct drm_device *dev,
  				      void *data, struct drm_file *file_priv);
  extern int drm_mode_connector_property_set_ioctl(struct drm_device *dev,
  					      void *data, struct drm_file *file_priv);
  extern int drm_mode_getencoder(struct drm_device *dev,
  			       void *data, struct drm_file *file_priv);
  extern int drm_mode_gamma_get_ioctl(struct drm_device *dev,
  				    void *data, struct drm_file *file_priv);
  extern int drm_mode_gamma_set_ioctl(struct drm_device *dev,
  				    void *data, struct drm_file *file_priv);
  extern u8 drm_match_cea_mode(const struct drm_display_mode *to_match);
  extern enum hdmi_picture_aspect drm_get_cea_aspect_ratio(const u8 video_code);
  extern bool drm_detect_hdmi_monitor(struct edid *edid);
  extern bool drm_detect_monitor_audio(struct edid *edid);
  extern bool drm_rgb_quant_range_selectable(struct edid *edid);
  extern int drm_mode_page_flip_ioctl(struct drm_device *dev,
  				    void *data, struct drm_file *file_priv);
  extern int drm_add_modes_noedid(struct drm_connector *connector,
  				int hdisplay, int vdisplay);
  extern void drm_set_preferred_mode(struct drm_connector *connector,
  				   int hpref, int vpref);
  
  extern int drm_edid_header_is_valid(const u8 *raw_edid);
  extern bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid,
  				 bool *edid_corrupt);
  extern bool drm_edid_is_valid(struct edid *edid);
  
  extern struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
  							 char topology[8]);
  extern struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
  					       char topology[8]);
  extern void drm_mode_put_tile_group(struct drm_device *dev,
  				   struct drm_tile_group *tg);
  struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
  					   int hsize, int vsize, int fresh,
  					   bool rb);
  
  extern int drm_mode_create_dumb_ioctl(struct drm_device *dev,
  				      void *data, struct drm_file *file_priv);
  extern int drm_mode_mmap_dumb_ioctl(struct drm_device *dev,
  				    void *data, struct drm_file *file_priv);
  extern int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
  				      void *data, struct drm_file *file_priv);
  extern int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
  					     struct drm_file *file_priv);
  extern int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
  					   struct drm_file *file_priv);
  extern int drm_mode_plane_set_obj_prop(struct drm_plane *plane,
  				       struct drm_property *property,
  				       uint64_t value);
  extern int drm_mode_atomic_ioctl(struct drm_device *dev,
  				 void *data, struct drm_file *file_priv);
  
  extern void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
  				 int *bpp);
  extern int drm_format_num_planes(uint32_t format);
  extern int drm_format_plane_cpp(uint32_t format, int plane);
  extern int drm_format_horz_chroma_subsampling(uint32_t format);
  extern int drm_format_vert_chroma_subsampling(uint32_t format);
  extern const char *drm_get_format_name(uint32_t format);
  extern struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
  							      unsigned int supported_rotations);
  extern unsigned int drm_rotation_simplify(unsigned int rotation,
  					  unsigned int supported_rotations);
  extern void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
  				       uint degamma_lut_size,
  				       bool has_ctm,
  				       uint gamma_lut_size);
  /* Helpers */
  
  static inline struct drm_plane *drm_plane_find(struct drm_device *dev,
  		uint32_t id)
  {
  	struct drm_mode_object *mo;
  	mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_PLANE);
  	return mo ? obj_to_plane(mo) : NULL;
  }
  
  static inline struct drm_crtc *drm_crtc_find(struct drm_device *dev,
  	uint32_t id)
  {
  	struct drm_mode_object *mo;
  	mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_CRTC);
  	return mo ? obj_to_crtc(mo) : NULL;
  }
  
  static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev,
  	uint32_t id)
  {
  	struct drm_mode_object *mo;
  	mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_ENCODER);
  	return mo ? obj_to_encoder(mo) : NULL;
  }
  
  static inline struct drm_connector *drm_connector_find(struct drm_device *dev,
  		uint32_t id)
  {
  	struct drm_mode_object *mo;
  	mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_CONNECTOR);
  	return mo ? obj_to_connector(mo) : NULL;
  }
  
  static inline struct drm_property *drm_property_find(struct drm_device *dev,
  		uint32_t id)
  {
  	struct drm_mode_object *mo;
  	mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_PROPERTY);
  	return mo ? obj_to_property(mo) : NULL;
  }
  
  /*
   * Extract a degamma/gamma LUT value provided by user and round it to the
   * precision supported by the hardware.
   */
  static inline uint32_t drm_color_lut_extract(uint32_t user_input,
  					     uint32_t bit_precision)
  {
  	uint32_t val = user_input + (1 << (16 - bit_precision - 1));
  	uint32_t max = 0xffff >> (16 - bit_precision);
  
  	val >>= 16 - bit_precision;
  
  	return clamp_val(val, 0, max);
  }
  
  /* Plane list iterator for legacy (overlay only) planes. */
  #define drm_for_each_legacy_plane(plane, dev) \
  	list_for_each_entry(plane, &(dev)->mode_config.plane_list, head) \
  		if (plane->type == DRM_PLANE_TYPE_OVERLAY)
  
  #define drm_for_each_plane(plane, dev) \
  	list_for_each_entry(plane, &(dev)->mode_config.plane_list, head)
  
  #define drm_for_each_crtc(crtc, dev) \
  	list_for_each_entry(crtc, &(dev)->mode_config.crtc_list, head)
  
  static inline void
  assert_drm_connector_list_read_locked(struct drm_mode_config *mode_config)
  {
  	/*
  	 * The connector hotadd/remove code currently grabs both locks when
  	 * updating lists. Hence readers need only hold either of them to be
  	 * safe and the check amounts to
  	 *
  	 * WARN_ON(not_holding(A) && not_holding(B)).
  	 */
  	WARN_ON(!mutex_is_locked(&mode_config->mutex) &&
  		!drm_modeset_is_locked(&mode_config->connection_mutex));
  }
  
  #define drm_for_each_connector(connector, dev) \
  	for (assert_drm_connector_list_read_locked(&(dev)->mode_config),	\
  	     connector = list_first_entry(&(dev)->mode_config.connector_list,	\
  					  struct drm_connector, head);		\
  	     &connector->head != (&(dev)->mode_config.connector_list);		\
  	     connector = list_next_entry(connector, head))
  
  #define drm_for_each_encoder(encoder, dev) \
  	list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head)
  
  #define drm_for_each_fb(fb, dev) \
  	for (WARN_ON(!mutex_is_locked(&(dev)->mode_config.fb_lock)),		\
  	     fb = list_first_entry(&(dev)->mode_config.fb_list,	\
  					  struct drm_framebuffer, head);	\
  	     &fb->head != (&(dev)->mode_config.fb_list);			\
  	     fb = list_next_entry(fb, head))
  
  #endif /* __DRM_CRTC_H__ */