OpenHarmony-v4.0-Release/s

/*
 * Copyright (c) 2016 Intel Corporation
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#ifndef __DRM_CONNECTOR_H__
#define __DRM_CONNECTOR_H__

#include <linux/list.h>
#include <linux/llist.h>
#include <linux/ctype.h>
#include <linux/hdmi.h>
#include <drm/drm_mode_object.h>
#include <drm/drm_util.h>

#include <uapi/drm/drm_mode.h>

struct drm_connector_helper_funcs;
struct drm_modeset_acquire_ctx;
struct drm_device;
struct drm_crtc;
struct drm_encoder;
struct drm_property;
struct drm_property_blob;
struct drm_printer;
struct edid;
struct i2c_adapter;

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 */
};

/**
 * enum drm_connector_status - status for a &drm_connector
 *
 * This enum is used to track the connector status. There are no separate
 * #defines for the uapi!
 */
enum drm_connector_status {
    /**
     * @connector_status_connected: The connector is definitely connected to
     * a sink device, and can be enabled.
     */
    connector_status_connected = 1,
    /**
     * @connector_status_disconnected: The connector isn't connected to a
     * sink device which can be autodetect. For digital outputs like DP or
     * HDMI (which can be realiable probed) this means there's really
     * nothing there. It is driver-dependent whether a connector with this
     * status can be lit up or not.
     */
    connector_status_disconnected = 2,
    /**
     * @connector_status_unknown: The connector's status could not be
     * reliably detected. This happens when probing would either cause
     * flicker (like load-detection when the connector is in use), or when a
     * hardware resource isn't available (like when load-detection needs a
     * free CRTC). It should be possible to light up the connector with one
     * of the listed fallback modes. For default configuration userspace
     * should only try to light up connectors with unknown status when
     * there's not connector with @connector_status_connected.
     */
    connector_status_unknown = 3,
};

/**
 * enum drm_connector_registration_status - userspace registration status for
 * a &drm_connector
 *
 * This enum is used to track the status of initializing a connector and
 * registering it with userspace, so that DRM can prevent bogus modesets on
 * connectors that no longer exist.
 */
enum drm_connector_registration_state {
    /**
     * @DRM_CONNECTOR_INITIALIZING: The connector has just been created,
     * but has yet to be exposed to userspace. There should be no
     * additional restrictions to how the state of this connector may be
     * modified.
     */
    DRM_CONNECTOR_INITIALIZING = 0,

    /**
     * @DRM_CONNECTOR_REGISTERED: The connector has been fully initialized
     * and registered with sysfs, as such it has been exposed to
     * userspace. There should be no additional restrictions to how the
     * state of this connector may be modified.
     */
    DRM_CONNECTOR_REGISTERED = 1,

    /**
     * @DRM_CONNECTOR_UNREGISTERED: The connector has either been exposed
     * to userspace and has since been unregistered and removed from
     * userspace, or the connector was unregistered before it had a chance
     * to be exposed to userspace (e.g. still in the
     * @DRM_CONNECTOR_INITIALIZING state). When a connector is
     * unregistered, there are additional restrictions to how its state
     * may be modified:
     *
     * - An unregistered connector may only have its DPMS changed from
     *   On->Off. Once DPMS is changed to Off, it may not be switched back
     *   to On.
     * - Modesets are not allowed on unregistered connectors, unless they
     *   would result in disabling its assigned CRTCs. This means
     *   disabling a CRTC on an unregistered connector is OK, but enabling
     *   one is not.
     * - Removing a CRTC from an unregistered connector is OK, but new
     *   CRTCs may never be assigned to an unregistered connector.
     */
    DRM_CONNECTOR_UNREGISTERED = 2,
};

enum subpixel_order {
    SubPixelUnknown = 0,
    SubPixelHorizontalRGB,
    SubPixelHorizontalBGR,
    SubPixelVerticalRGB,
    SubPixelVerticalBGR,
    SubPixelNone,
};

/**
 * struct drm_scrambling: sink's scrambling support.
 */
struct drm_scrambling {
    /**
     * @supported: scrambling supported for rates > 340 Mhz.
     */
    bool supported;
    /**
     * @low_rates: scrambling supported for rates <= 340 Mhz.
     */
    bool low_rates;
};

/*
 * struct drm_scdc - Information about scdc capabilities of a HDMI 2.0 sink
 *
 * Provides SCDC register support and capabilities related information on a
 * HDMI 2.0 sink. In case of a HDMI 1.4 sink, all parameter must be 0.
 */
struct drm_scdc {
    /**
     * @supported: status control & data channel present.
     */
    bool supported;
    /**
     * @read_request: sink is capable of generating scdc read request.
     */
    bool read_request;
    /**
     * @scrambling: sink's scrambling capabilities
     */
    struct drm_scrambling scrambling;
};

#ifdef CONFIG_NO_GKI
/**
 * struct drm_hdmi_dsc_cap - DSC capabilities of HDMI sink
 *
 * Describes the DSC support provided by HDMI 2.1 sink.
 * The information is fetched fom additional HFVSDB blocks defined
 * for HDMI 2.1.
 */
struct drm_hdmi_dsc_cap {
    /** @v_1p2: flag for dsc1.2 version support by sink */
    bool v_1p2;

    /** @native_420: Does sink support DSC with 4:2:0 compression */
    bool native_420;

    /**
     * @all_bpp: Does sink support all bpp with 4:4:4: or 4:2:2
     * compressed formats
     */
    bool all_bpp;

    /**
     * @bpc_supported: compressed bpc supported by sink : 10, 12 or 16 bpc
     */
    u8 bpc_supported;

    /** @max_slices: maximum number of Horizontal slices supported by */
    u8 max_slices;

    /** @clk_per_slice : max pixel clock in MHz supported per slice */
    int clk_per_slice;

    /** @max_lanes : dsc max lanes supported for Fixed rate Link training */
    u8 max_lanes;

    /** @max_frl_rate_per_lane : maximum frl rate with DSC per lane */
    u8 max_frl_rate_per_lane;

    /** @total_chunk_kbytes: max size of chunks in KBs supported per line*/
    u8 total_chunk_kbytes;
};
#endif

/**
 * struct drm_hdmi_info - runtime information about the connected HDMI sink
 *
 * Describes if a given display supports advanced HDMI 2.0 features.
 * This information is available in CEA-861-F extension blocks (like HF-VSDB).
 */
struct drm_hdmi_info {
    /** @scdc: sink's scdc support and capabilities */
    struct drm_scdc scdc;

    /**
     * @y420_vdb_modes: bitmap of modes which can support ycbcr420
     * output only (not normal RGB/YCBCR444/422 outputs). The max VIC
     * defined by the CEA-861-G spec is 219, so the size is 256 bits to map
     * up to 256 VICs.
     */
    unsigned long y420_vdb_modes[BITS_TO_LONGS(256)];

    /**
     * @y420_cmdb_modes: bitmap of modes which can support ycbcr420
     * output also, along with normal HDMI outputs. The max VIC defined by
     * the CEA-861-G spec is 219, so the size is 256 bits to map up to 256
     * VICs.
     */
    unsigned long y420_cmdb_modes[BITS_TO_LONGS(256)];

    /** @y420_cmdb_map: bitmap of SVD index, to extraxt vcb modes */
    u64 y420_cmdb_map;

    /** @y420_dc_modes: bitmap of deep color support index */
    u8 y420_dc_modes;

#ifdef CONFIG_NO_GKI
    /** @max_frl_rate_per_lane: support fixed rate link */
    u8 max_frl_rate_per_lane;

    /** @max_lanes: supported by sink */
    u8 max_lanes;

    /** @dsc_cap: DSC capabilities of the sink */
    struct drm_hdmi_dsc_cap dsc_cap;
#endif
};

/**
 * enum drm_link_status - connector's link_status property value
 *
 * This enum is used as the connector's link status property value.
 * It is set to the values defined in uapi.
 *
 * @DRM_LINK_STATUS_GOOD: DP Link is Good as a result of successful
 *                        link training
 * @DRM_LINK_STATUS_BAD: DP Link is BAD as a result of link training
 *                       failure
 */
enum drm_link_status {
    DRM_LINK_STATUS_GOOD = DRM_MODE_LINK_STATUS_GOOD,
    DRM_LINK_STATUS_BAD = DRM_MODE_LINK_STATUS_BAD,
};

/**
 * enum drm_panel_orientation - panel_orientation info for &drm_display_info
 *
 * This enum is used to track the (LCD) panel orientation. There are no
 * separate #defines for the uapi!
 *
 * @DRM_MODE_PANEL_ORIENTATION_UNKNOWN: The drm driver has not provided any
 *                    panel orientation information (normal
 *                    for non panels) in this case the "panel
 *                    orientation" connector prop will not be
 *                    attached.
 * @DRM_MODE_PANEL_ORIENTATION_NORMAL:    The top side of the panel matches the
 *                    top side of the device's casing.
 * @DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP: The top side of the panel matches the
 *                    bottom side of the device's casing, iow
 *                    the panel is mounted upside-down.
 * @DRM_MODE_PANEL_ORIENTATION_LEFT_UP:    The left side of the panel matches the
 *                    top side of the device's casing.
 * @DRM_MODE_PANEL_ORIENTATION_RIGHT_UP: The right side of the panel matches the
 *                    top side of the device's casing.
 */
enum drm_panel_orientation {
    DRM_MODE_PANEL_ORIENTATION_UNKNOWN = -1,
    DRM_MODE_PANEL_ORIENTATION_NORMAL = 0,
    DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP,
    DRM_MODE_PANEL_ORIENTATION_LEFT_UP,
    DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
};

/**
 * struct drm_monitor_range_info - Panel's Monitor range in EDID for
 * &drm_display_info
 *
 * This struct is used to store a frequency range supported by panel
 * as parsed from EDID's detailed monitor range descriptor block.
 *
 * @min_vfreq: This is the min supported refresh rate in Hz from
 *             EDID's detailed monitor range.
 * @max_vfreq: This is the max supported refresh rate in Hz from
 *             EDID's detailed monitor range
 */
struct drm_monitor_range_info {
    u8 min_vfreq;
    u8 max_vfreq;
};

/*
 * This is a consolidated colorimetry list supported by HDMI and
 * DP protocol standard. The respective connectors will register
 * a property with the subset of this list (supported by that
 * respective protocol). Userspace will set the colorspace through
 * a colorspace property which will be created and exposed to
 * userspace.
 */

/* For Default case, driver will set the colorspace */
#define DRM_MODE_COLORIMETRY_DEFAULT 0
/* CEA 861 Normal Colorimetry options */
#define DRM_MODE_COLORIMETRY_NO_DATA 0
#define DRM_MODE_COLORIMETRY_SMPTE_170M_YCC 1
#define DRM_MODE_COLORIMETRY_BT709_YCC 2
/* CEA 861 Extended Colorimetry Options */
#define DRM_MODE_COLORIMETRY_XVYCC_601 3
#define DRM_MODE_COLORIMETRY_XVYCC_709 4
#define DRM_MODE_COLORIMETRY_SYCC_601 5
#define DRM_MODE_COLORIMETRY_OPYCC_601 6
#define DRM_MODE_COLORIMETRY_OPRGB 7
#define DRM_MODE_COLORIMETRY_BT2020_CYCC 8
#define DRM_MODE_COLORIMETRY_BT2020_RGB 9
#define DRM_MODE_COLORIMETRY_BT2020_YCC 10
/* Additional Colorimetry extension added as part of CTA 861.G */
#define DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65 11
#define DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER 12
/* Additional Colorimetry Options added for DP 1.4a VSC Colorimetry Format */
#define DRM_MODE_COLORIMETRY_RGB_WIDE_FIXED 13
#define DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT 14
#define DRM_MODE_COLORIMETRY_BT601_YCC 15

/**
 * enum drm_bus_flags - bus_flags info for &drm_display_info
 *
 * This enum defines signal polarities and clock edge information for signals on
 * a bus as bitmask flags.
 *
 * The clock edge information is conveyed by two sets of symbols,
 * DRM_BUS_FLAGS_*_DRIVE_\* and DRM_BUS_FLAGS_*_SAMPLE_\*. When this enum is
 * used to describe a bus from the point of view of the transmitter, the
 * \*_DRIVE_\* flags should be used. When used from the point of view of the
 * receiver, the \*_SAMPLE_\* flags should be used. The \*_DRIVE_\* and
 * \*_SAMPLE_\* flags alias each other, with the \*_SAMPLE_POSEDGE and
 * \*_SAMPLE_NEGEDGE flags being equal to \*_DRIVE_NEGEDGE and \*_DRIVE_POSEDGE
 * respectively. This simplifies code as signals are usually sampled on the
 * opposite edge of the driving edge. Transmitters and receivers may however
 * need to take other signal timings into account to convert between driving
 * and sample edges.
 */
enum drm_bus_flags {
    /**
     * @DRM_BUS_FLAG_DE_LOW:
     *
     * The Data Enable signal is active low
     */
    DRM_BUS_FLAG_DE_LOW = BIT(0),

    /**
     * @DRM_BUS_FLAG_DE_HIGH:
     *
     * The Data Enable signal is active high
     */
    DRM_BUS_FLAG_DE_HIGH = BIT(1),

    /**
     * @DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE:
     *
     * Data is driven on the rising edge of the pixel clock
     */
    DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE = BIT(2),

    /**
     * @DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE:
     *
     * Data is driven on the falling edge of the pixel clock
     */
    DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE = BIT(3),

    /**
     * @DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE:
     *
     * Data is sampled on the rising edge of the pixel clock
     */
    DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE = BIT(3),

    /**
     * @DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE:
     *
     * Data is sampled on the falling edge of the pixel clock
     */
    DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE = BIT(2),

    /**
     * @DRM_BUS_FLAG_DATA_MSB_TO_LSB:
     *
     * Data is transmitted MSB to LSB on the bus
     */
    DRM_BUS_FLAG_DATA_MSB_TO_LSB = BIT(4),

    /**
     * @DRM_BUS_FLAG_DATA_LSB_TO_MSB:
     *
     * Data is transmitted LSB to MSB on the bus
     */
    DRM_BUS_FLAG_DATA_LSB_TO_MSB = BIT(5),

    /**
     * @DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE:
     *
     * Sync signals are driven on the rising edge of the pixel clock
     */
    DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE = BIT(6),

    /**
     * @DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE:
     *
     * Sync signals are driven on the falling edge of the pixel clock
     */
    DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE = BIT(7),

    /**
     * @DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE:
     *
     * Sync signals are sampled on the rising edge of the pixel clock
     */
    DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE = DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE,

    /**
     * @DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE:
     *
     * Sync signals are sampled on the falling edge of the pixel clock
     */
    DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE = DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE,

    /**
     * @DRM_BUS_FLAG_SHARP_SIGNALS:
     *
     *  Set if the Sharp-specific signals (SPL, CLS, PS, REV) must be used
     */
    DRM_BUS_FLAG_SHARP_SIGNALS = BIT(8),
};

/**
 * struct drm_display_info - runtime data about the connected sink
 *
 * Describes a given display (e.g. CRT or flat panel) and its limitations. For
 * fixed display sinks like built-in panels there's not much difference between
 * this and &struct drm_connector. But for sinks with a real cable this
 * structure is meant to describe all the things at the other end of the cable.
 *
 * For sinks which provide an EDID this can be filled out by calling
 * drm_add_edid_modes().
 */
struct drm_display_info {
    /**
     * @width_mm: Physical width in mm.
     */
    unsigned int width_mm;

    /**
     * @height_mm: Physical height in mm.
     */
    unsigned int height_mm;

    /**
     * @bpc: Maximum bits per color channel. Used by HDMI and DP outputs.
     */
    unsigned int bpc;

    /**
     * @subpixel_order: Subpixel order of LCD panels.
     */
    enum subpixel_order subpixel_order;

#define DRM_COLOR_FORMAT_RGB444 (1 << 0)
#define DRM_COLOR_FORMAT_YCRCB444 (1 << 1)
#define DRM_COLOR_FORMAT_YCRCB422 (1 << 2)
#define DRM_COLOR_FORMAT_YCRCB420 (1 << 3)

    /**
     * @panel_orientation: Read only connector property for built-in panels,
     * indicating the orientation of the panel vs the device's casing.
     * drm_connector_init() sets this to DRM_MODE_PANEL_ORIENTATION_UNKNOWN.
     * When not UNKNOWN this gets used by the drm_fb_helpers to rotate the
     * fb to compensate and gets exported as prop to userspace.
     */
    int panel_orientation;

    /**
     * @color_formats: HDMI Color formats, selects between RGB and YCrCb
     * modes. Used DRM_COLOR_FORMAT\_ defines, which are _not_ the same ones
     * as used to describe the pixel format in framebuffers, and also don't
     * match the formats in @bus_formats which are shared with v4l.
     */
    u32 color_formats;

    /**
     * @bus_formats: Pixel data format on the wire, somewhat redundant with
     * @color_formats. Array of size @num_bus_formats encoded using
     * MEDIA_BUS_FMT\_ defines shared with v4l and media drivers.
     */
    const u32 *bus_formats;
    /**
     * @num_bus_formats: Size of @bus_formats array.
     */
    unsigned int num_bus_formats;

    /**
     * @bus_flags: Additional information (like pixel signal polarity) for
     * the pixel data on the bus, using &enum drm_bus_flags values
     * DRM_BUS_FLAGS\_.
     */
    u32 bus_flags;

    /**
     * @max_tmds_clock: Maximum TMDS clock rate supported by the
     * sink in kHz. 0 means undefined.
     */
    int max_tmds_clock;

    /**
     * @dvi_dual: Dual-link DVI sink?
     */
    bool dvi_dual;

    /**
     * @is_hdmi: True if the sink is an HDMI device.
     *
     * This field shall be used instead of calling
     * drm_detect_hdmi_monitor() when possible.
     */
    bool is_hdmi;

    /**
     * @has_hdmi_infoframe: Does the sink support the HDMI infoframe?
     */
    bool has_hdmi_infoframe;

    /**
     * @rgb_quant_range_selectable: Does the sink support selecting
     * the RGB quantization range?
     */
    bool rgb_quant_range_selectable;

    /**
     * @edid_hdmi_dc_modes: Mask of supported hdmi deep color modes. Even
     * more stuff redundant with @bus_formats.
     */
    u8 edid_hdmi_dc_modes;

    /**
     * @cea_rev: CEA revision of the HDMI sink.
     */
    u8 cea_rev;

    /**
     * @hdmi: advance features of a HDMI sink.
     */
    struct drm_hdmi_info hdmi;

    /**
     * @non_desktop: Non desktop display (HMD).
     */
    bool non_desktop;

    /**
     * @monitor_range: Frequency range supported by monitor range descriptor
     */
    struct drm_monitor_range_info monitor_range;
};

int drm_display_info_set_bus_formats(struct drm_display_info *info, const u32 *formats, unsigned int num_formats);

/**
 * struct drm_connector_tv_margins - TV connector related margins
 *
 * Describes the margins in pixels to put around the image on TV
 * connectors to deal with overscan.
 */
struct drm_connector_tv_margins {
    /**
     * @bottom: Bottom margin in pixels.
     */
    unsigned int bottom;

    /**
     * @left: Left margin in pixels.
     */
    unsigned int left;

    /**
     * @right: Right margin in pixels.
     */
    unsigned int right;

    /**
     * @top: Top margin in pixels.
     */
    unsigned int top;
};

/**
 * struct drm_tv_connector_state - TV connector related states
 * @subconnector: selected subconnector
 * @margins: TV margins
 * @mode: TV mode
 * @brightness: brightness in percent
 * @contrast: contrast in percent
 * @flicker_reduction: flicker reduction in percent
 * @overscan: overscan in percent
 * @saturation: saturation in percent
 * @hue: hue in percent
 */
struct drm_tv_connector_state {
    enum drm_mode_subconnector subconnector;
    struct drm_connector_tv_margins margins;
    unsigned int mode;
    unsigned int brightness;
    unsigned int contrast;
    unsigned int flicker_reduction;
    unsigned int overscan;
    unsigned int saturation;
    unsigned int hue;
};

/**
 * struct drm_connector_state - mutable connector state
 */
struct drm_connector_state {
    /** @connector: backpointer to the connector */
    struct drm_connector *connector;

    /**
     * @crtc: CRTC to connect connector to, NULL if disabled.
     *
     * Do not change this directly, use drm_atomic_set_crtc_for_connector()
     * instead.
     */
    struct drm_crtc *crtc;

    /**
     * @best_encoder:
     *
     * Used by the atomic helpers to select the encoder, through the
     * &drm_connector_helper_funcs.atomic_best_encoder or
     * &drm_connector_helper_funcs.best_encoder callbacks.
     *
     * This is also used in the atomic helpers to map encoders to their
     * current and previous connectors, see
     * drm_atomic_get_old_connector_for_encoder() and
     * drm_atomic_get_new_connector_for_encoder().
     *
     * NOTE: Atomic drivers must fill this out (either themselves or through
     * helpers), for otherwise the GETCONNECTOR and GETENCODER IOCTLs will
     * not return correct data to userspace.
     */
    struct drm_encoder *best_encoder;

    /**
     * @link_status: Connector link_status to keep track of whether link is
     * GOOD or BAD to notify userspace if retraining is necessary.
     */
    enum drm_link_status link_status;

    /** @state: backpointer to global drm_atomic_state */
    struct drm_atomic_state *state;

    /**
     * @commit: Tracks the pending commit to prevent use-after-free conditions.
     *
     * Is only set when @crtc is NULL.
     */
    struct drm_crtc_commit *commit;

    /** @tv: TV connector state */
    struct drm_tv_connector_state tv;

    /**
     * @self_refresh_aware:
     *
     * This tracks whether a connector is aware of the self refresh state.
     * It should be set to true for those connector implementations which
     * understand the self refresh state. This is needed since the crtc
     * registers the self refresh helpers and it doesn't know if the
     * connectors downstream have implemented self refresh entry/exit.
     *
     * Drivers should set this to true in atomic_check if they know how to
     * handle self_refresh requests.
     */
    bool self_refresh_aware;

    /**
     * @picture_aspect_ratio: Connector property to control the
     * HDMI infoframe aspect ratio setting.
     *
     * The %DRM_MODE_PICTURE_ASPECT_\* values much match the
     * values for &enum hdmi_picture_aspect
     */
    enum hdmi_picture_aspect picture_aspect_ratio;

    /**
     * @content_type: Connector property to control the
     * HDMI infoframe content type setting.
     * The %DRM_MODE_CONTENT_TYPE_\* values much
     * match the values.
     */
    unsigned int content_type;

    /**
     * @hdcp_content_type: Connector property to pass the type of
     * protected content. This is most commonly used for HDCP.
     */
    unsigned int hdcp_content_type;

    /**
     * @scaling_mode: Connector property to control the
     * upscaling, mostly used for built-in panels.
     */
    unsigned int scaling_mode;

    /**
     * @content_protection: Connector property to request content
     * protection. This is most commonly used for HDCP.
     */
    unsigned int content_protection;

    /**
     * @colorspace: State variable for Connector property to request
     * colorspace change on Sink. This is most commonly used to switch
     * to wider color gamuts like BT2020.
     */
    u32 colorspace;

    /**
     * @writeback_job: Writeback job for writeback connectors
     *
     * Holds the framebuffer and out-fence for a writeback connector. As
     * the writeback completion may be asynchronous to the normal commit
     * cycle, the writeback job lifetime is managed separately from the
     * normal atomic state by this object.
     *
     * See also: drm_writeback_queue_job() and
     * drm_writeback_signal_completion()
     */
    struct drm_writeback_job *writeback_job;

    /**
     * @max_requested_bpc: Connector property to limit the maximum bit
     * depth of the pixels.
     */
    u8 max_requested_bpc;

    /**
     * @max_bpc: Connector max_bpc based on the requested max_bpc property
     * and the connector bpc limitations obtained from edid.
     */
    u8 max_bpc;

    /**
     * @hdr_output_metadata:
     * DRM blob property for HDR output metadata
     */
    struct drm_property_blob *hdr_output_metadata;
};

/**
 * struct drm_connector_funcs - control connectors on a given device
 *
 * 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 {
    /**
     * @dpms
     *
     * Legacy entry point to set the per-connector DPMS state. Legacy DPMS
     * is exposed as a standard property on the connector, but diverted to
     * this callback in the drm core. Note that atomic drivers don't
     * implement the 4 level DPMS support on the connector any more, but
     * instead only have an on/off "ACTIVE" property on the CRTC object.
     *
     * This hook is not used by atomic drivers, remapping of the legacy DPMS
     * property is entirely handled in the DRM core.
     *
     * RETURNS
     *
     * 0 on success or a negative error code on failure.
     */
    int (*dpms)(struct drm_connector *connector, int mode);

    /**
     * @reset
     *
     * Reset connector hardware and software state to off. This function isn't
     * called by the core directly, only through drm_mode_config_reset().
     * It's not a helper hook only for historical reasons.
     *
     * Atomic drivers can use drm_atomic_helper_connector_reset() to reset
     * atomic state using this hook.
     */
    void (*reset)(struct drm_connector *connector);

    /**
     * @detect
     *
     * Check to see if anything is attached to the connector. The parameter
     * force is set to false whilst polling, true when checking the
     * connector due to a user request. force can be used by the driver to
     * avoid expensive, destructive operations during automated probing.
     *
     * This callback is optional, if not implemented the connector will be
     * considered as always being attached.
     *
     *
     * Note that this hook is only called by the probe helper. It's not in
     * the helper library vtable purely for historical reasons. The only DRM
     * core    entry point to probe connector state is @fill_modes.
     *
     * Note that the helper library will already hold
     * &drm_mode_config.connection_mutex. Drivers which need to grab additional
     * locks to avoid races with concurrent modeset changes need to use
     * &drm_connector_helper_funcs.detect_ctx instead.
     *
     * RETURNS
     *
     * drm_connector_status indicating the connector's status.
     */
    enum drm_connector_status (*detect)(struct drm_connector *connector, bool force);

    /**
     * @force
     *
     * This function is called to update internal encoder state when the
     * connector is forced to a certain state by userspace, either through
     * the sysfs interfaces or on the kernel cmdline. In that case the
     * @detect callback isn't called.
     *
     *
     * Note that this hook is only called by the probe helper. It's not in
     * the helper library vtable purely for historical reasons. The only DRM
     * core    entry point to probe connector state is @fill_modes.
     */
    void (*force)(struct drm_connector *connector);

    /**
     * @fill_modes
     *
     * Entry point for output detection and basic mode validation. The
     * driver should reprobe the output if needed (e.g. when hotplug
     * handling is unreliable), add all detected modes to &drm_connector.modes
     * and filter out any the device can't support in any configuration. It
     * also needs to filter out any modes wider or higher than the
     * parameters max_width and max_height indicate.
     *
     * The drivers must also prune any modes no longer valid from
     * &drm_connector.modes. Furthermore it must update
     * &drm_connector.status and &drm_connector.edid.  If no EDID has been
     * received for this output connector->edid must be NULL.
     *
     * Drivers using the probe helpers should use
     * drm_helper_probe_single_connector_modes() to implement this
     * function.
     *
     * RETURNS
     *
     * The number of modes detected and filled into &drm_connector.modes.
     */
    int (*fill_modes)(struct drm_connector *connector, uint32_t max_width, uint32_t max_height);

    /**
     * @set_property
     *
     * This is the legacy entry point to update a property attached to the
     * connector.
     *
     * This callback is optional if the driver does not support any legacy
     * driver-private properties. For atomic drivers it is not used because
     * property handling is done entirely in the DRM core.
     *
     * RETURNS
     *
     * 0 on success or a negative error code on failure.
     */
    int (*set_property)(struct drm_connector *connector, struct drm_property *property, uint64_t val);

    /**
     * @late_register
     *
     * This optional hook can be used to register additional userspace
     * interfaces attached to the connector, light backlight control, i2c,
     * DP aux or similar interfaces. It is called late in the driver load
     * sequence from drm_connector_register() when registering all the
     * core drm connector interfaces. Everything added from this callback
     * should be unregistered in the early_unregister callback.
     *
     * This is called while holding &drm_connector.mutex.
     *
     * Returns
     *
     * 0 on success, or a negative error code on failure.
     */
    int (*late_register)(struct drm_connector *connector);

    /**
     * @early_unregister
     *
     * This optional hook should be used to unregister the additional
     * userspace interfaces attached to the connector from
     * late_register(). It is called from drm_connector_unregister(),
     * early in the driver unload sequence to disable userspace access
     * before data structures are torndown.
     *
     * This is called while holding &drm_connector.mutex.
     */
    void (*early_unregister)(struct drm_connector *connector);

    /**
     * @destroy
     *
     * Clean up connector resources. This is called at driver unload time
     * through drm_mode_config_cleanup(). It can also be called at runtime
     * when a connector is being hot-unplugged for drivers that support
     * connector hotplugging (e.g. DisplayPort MST).
     */
    void (*destroy)(struct drm_connector *connector);

    /**
     * @atomic_duplicate_state
     *
     * Duplicate the current atomic state for this connector and return it.
     * The core and helpers guarantee that any atomic state duplicated with
     * this hook and still owned by the caller (i.e. not transferred to the
     * driver by calling &drm_mode_config_funcs.atomic_commit) will be
     * cleaned up by calling the @atomic_destroy_state hook in this
     * structure.
     *
     * This callback is mandatory for atomic drivers.
     *
     * Atomic drivers which don't subclass &struct drm_connector_state should use
     * drm_atomic_helper_connector_duplicate_state(). Drivers that subclass the
     * state structure to extend it with driver-private state should use
     * __drm_atomic_helper_connector_duplicate_state() to make sure shared state is
     * duplicated in a consistent fashion across drivers.
     *
     * It is an error to call this hook before &drm_connector.state has been
     * initialized correctly.
     *
     * NOTE
     *
     * If the duplicate state references refcounted resources this hook must
     * acquire a reference for each of them. The driver must release these
     * references again in @atomic_destroy_state.
     *
     * RETURNS
     *
     * Duplicated atomic state or NULL when the allocation failed.
     */
    struct drm_connector_state *(*atomic_duplicate_state)(struct drm_connector *connector);

    /**
     * @atomic_destroy_state
     *
     * Destroy a state duplicated with @atomic_duplicate_state and release
     * or unreference all resources it references
     *
     * This callback is mandatory for atomic drivers.
     */
    void (*atomic_destroy_state)(struct drm_connector *connector, struct drm_connector_state *state);

    /**
     * @atomic_set_property
     *
     * Decode a driver-private property value and store the decoded value
     * into the passed-in state structure. Since the atomic core decodes all
     * standardized properties (even for extensions beyond the core set of
     * properties which might not be implemented by all drivers) this
     * requires drivers to subclass the state structure.
     *
     * Such driver-private properties should really only be implemented for
     * truly hardware/vendor specific state. Instead it is preferred to
     * standardize atomic extension and decode the properties used to expose
     * such an extension in the core.
     *
     * Do not call this function directly, use
     * drm_atomic_connector_set_property() instead.
     *
     * This callback is optional if the driver does not support any
     * driver-private atomic properties.
     *
     * NOTE
     *
     * This function is called in the state assembly phase of atomic
     * modesets, which can be aborted for any reason (including on
     * userspace's request to just check whether a configuration would be
     * possible). Drivers MUST NOT touch any persistent state (hardware or
     * software) or data structures except the passed in @state parameter.
     *
     * Also since userspace controls in which order properties are set this
     * function must not do any input validation (since the state update is
     * incomplete and hence likely inconsistent). Instead any such input
     * validation must be done in the various atomic_check callbacks.
     *
     * RETURNS
     *
     * 0 if the property has been found, -EINVAL if the property isn't
     * implemented by the driver (which shouldn't ever happen, the core only
     * asks for properties attached to this connector). No other validation
     * is allowed by the driver. The core already checks that the property
     * value is within the range (integer, valid enum value, ...) the driver
     * set when registering the property.
     */
    int (*atomic_set_property)(struct drm_connector *connector, struct drm_connector_state *state,
                               struct drm_property *property, uint64_t val);

    /**
     * @atomic_get_property
     *
     * Reads out the decoded driver-private property. This is used to
     * implement the GETCONNECTOR IOCTL.
     *
     * Do not call this function directly, use
     * drm_atomic_connector_get_property() instead.
     *
     * This callback is optional if the driver does not support any
     * driver-private atomic properties.
     *
     * RETURNS
     *
     * 0 on success, -EINVAL if the property isn't implemented by the
     * driver (which shouldn't ever happen, the core only asks for
     * properties attached to this connector).
     */
    int (*atomic_get_property)(struct drm_connector *connector, const struct drm_connector_state *state,
                               struct drm_property *property, uint64_t *val);

    /**
     * @atomic_print_state
     *
     * If driver subclasses &struct drm_connector_state, it should implement
     * this optional hook for printing additional driver specific state.
     *
     * Do not call this directly, use drm_atomic_connector_print_state()
     * instead.
     */
    void (*atomic_print_state)(struct drm_printer *p, const struct drm_connector_state *state);
};

/**
 * struct drm_cmdline_mode - DRM Mode passed through the kernel command-line
 *
 * Each connector can have an initial mode with additional options
 * passed through the kernel command line. This structure allows to
 * express those parameters and will be filled by the command-line
 * parser.
 */
struct drm_cmdline_mode {
    /**
     * @name:
     *
     * Name of the mode.
     */
    char name[DRM_DISPLAY_MODE_LEN];

    /**
     * @specified:
     *
     * Has a mode been read from the command-line?
     */
    bool specified;

    /**
     * @refresh_specified:
     *
     * Did the mode have a preferred refresh rate?
     */
    bool refresh_specified;

    /**
     * @bpp_specified:
     *
     * Did the mode have a preferred BPP?
     */
    bool bpp_specified;

    /**
     * @xres:
     *
     * Active resolution on the X axis, in pixels.
     */
    int xres;

    /**
     * @yres:
     *
     * Active resolution on the Y axis, in pixels.
     */
    int yres;

    /**
     * @bpp:
     *
     * Bits per pixels for the mode.
     */
    int bpp;

    /**
     * @refresh:
     *
     * Refresh rate, in Hertz.
     */
    int refresh;

    /**
     * @rb:
     *
     * Do we need to use reduced blanking?
     */
    bool rb;

    /**
     * @interlace:
     *
     * The mode is interlaced.
     */
    bool interlace;

    /**
     * @cvt:
     *
     * The timings will be calculated using the VESA Coordinated
     * Video Timings instead of looking up the mode from a table.
     */
    bool cvt;

    /**
     * @margins:
     *
     * Add margins to the mode calculation (1.8% of xres rounded
     * down to 8 pixels and 1.8% of yres).
     */
    bool margins;

    /**
     * @force:
     *
     * Ignore the hotplug state of the connector, and force its
     * state to one of the DRM_FORCE_* values.
     */
    enum drm_connector_force force;

    /**
     * @rotation_reflection:
     *
     * Initial rotation and reflection of the mode setup from the
     * command line. See DRM_MODE_ROTATE_* and
     * DRM_MODE_REFLECT_*. The only rotations supported are
     * DRM_MODE_ROTATE_0 and DRM_MODE_ROTATE_180.
     */
    unsigned int rotation_reflection;

    /**
     * @panel_orientation:
     *
     * drm-connector "panel orientation" property override value,
     * DRM_MODE_PANEL_ORIENTATION_UNKNOWN if not set.
     */
    enum drm_panel_orientation panel_orientation;

    /**
     * @tv_margins: TV margins to apply to the mode.
     */
    struct drm_connector_tv_margins tv_margins;
};

/**
 * struct drm_connector - central DRM connector control structure
 *
 * 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 {
    /** @dev: parent DRM device */
    struct drm_device *dev;
    /** @kdev: kernel device for sysfs attributes */
    struct device *kdev;
    /** @attr: sysfs attributes */
    struct device_attribute *attr;

    /**
     * @head:
     *
     * List of all connectors on a @dev, linked from
     * &drm_mode_config.connector_list. Protected by
     * &drm_mode_config.connector_list_lock, but please only use
     * &drm_connector_list_iter to walk this list.
     */
    struct list_head head;

    /** @base: base KMS object */
    struct drm_mode_object base;

    /** @name: human readable name, can be overwritten by the driver */
    char *name;

    /**
     * @mutex: Lock for general connector state, but currently only protects
     * @registered. Most of the connector state is still protected by
     * &drm_mode_config.mutex.
     */
    struct mutex mutex;

    /**
     * @index: Compacted connector index, which matches the position inside
     * the mode_config.list for drivers not supporting hot-add/removing. Can
     * be used as an array index. It is invariant over the lifetime of the
     * connector.
     */
    unsigned index;

    /**
     * @connector_type:
     * one of the DRM_MODE_CONNECTOR_<foo> types from drm_mode.h
     */
    int connector_type;
    /** @connector_type_id: index into connector type enum */
    int connector_type_id;
    /**
     * @interlace_allowed:
     * Can this connector handle interlaced modes? Only used by
     * drm_helper_probe_single_connector_modes() for mode filtering.
     */
    bool interlace_allowed;
    /**
     * @doublescan_allowed:
     * Can this connector handle doublescan? Only used by
     * drm_helper_probe_single_connector_modes() for mode filtering.
     */
    bool doublescan_allowed;
    /**
     * @stereo_allowed:
     * Can this connector handle stereo modes? Only used by
     * drm_helper_probe_single_connector_modes() for mode filtering.
     */
    bool stereo_allowed;

    /**
     * @ycbcr_420_allowed : This bool indicates if this connector is
     * capable of handling YCBCR 420 output. While parsing the EDID
     * blocks it's very helpful to know if the source is capable of
     * handling YCBCR 420 outputs.
     */
    bool ycbcr_420_allowed;

    /**
     * @registration_state: Is this connector initializing, exposed
     * (registered) with userspace, or unregistered?
     *
     * Protected by @mutex.
     */
    enum drm_connector_registration_state registration_state;

    /**
     * @modes:
     * Modes available on this connector (from fill_modes() + user).
     * Protected by &drm_mode_config.mutex.
     */
    struct list_head modes;

    /**
     * @status:
     * One of the drm_connector_status enums (connected, not, or unknown).
     * Protected by &drm_mode_config.mutex.
     */
    enum drm_connector_status status;

    /**
     * @probed_modes:
     * These are modes added by probing with DDC or the BIOS, before
     * filtering is applied. Used by the probe helpers. Protected by
     * &drm_mode_config.mutex.
     */
    struct list_head probed_modes;

    /**
     * @display_info: Display information is filled from EDID information
     * when a display is detected. For non hot-pluggable displays such as
     * flat panels in embedded systems, the driver should initialize the
     * &drm_display_info.width_mm and &drm_display_info.height_mm fields
     * with the physical size of the display.
     *
     * Protected by &drm_mode_config.mutex.
     */
    struct drm_display_info display_info;

    /** @funcs: connector control functions */
    const struct drm_connector_funcs *funcs;

    /**
     * @edid_blob_ptr: DRM property containing EDID if present. Protected by
     * &drm_mode_config.mutex. This should be updated only by calling
     * drm_connector_update_edid_property().
     */
    struct drm_property_blob *edid_blob_ptr;

    /** @properties: property tracking for this connector */
    struct drm_object_properties properties;

    /**
     * @scaling_mode_property: Optional atomic property to control the
     * upscaling. See drm_connector_attach_content_protection_property().
     */
    struct drm_property *scaling_mode_property;

    /**
     * @vrr_capable_property: Optional property to help userspace
     * query hardware support for variable refresh rate on a connector.
     * connector. Drivers can add the property to a connector by
     * calling drm_connector_attach_vrr_capable_property().
     *
     * This should be updated only by calling
     * drm_connector_set_vrr_capable_property().
     */
    struct drm_property *vrr_capable_property;

    /**
     * @colorspace_property: Connector property to set the suitable
     * colorspace supported by the sink.
     */
    struct drm_property *colorspace_property;

    /**
     * @path_blob_ptr:
     *
     * DRM blob property data for the DP MST path property. This should only
     * be updated by calling drm_connector_set_path_property().
     */
    struct drm_property_blob *path_blob_ptr;

    /**
     * @max_bpc_property: Default connector property for the max bpc to be
     * driven out of the connector.
     */
    struct drm_property *max_bpc_property;

#define DRM_CONNECTOR_POLL_HPD (1 << 0)
#define DRM_CONNECTOR_POLL_CONNECT (1 << 1)
#define DRM_CONNECTOR_POLL_DISCONNECT (1 << 2)

    /**
     * @polled:
     *
     * Connector polling mode, a combination of
     *
     * DRM_CONNECTOR_POLL_HPD
     *     The connector generates hotplug events and doesn't need to be
     *     periodically polled. The CONNECT and DISCONNECT flags must not
     *     be set together with the HPD flag.
     *
     * DRM_CONNECTOR_POLL_CONNECT
     *     Periodically poll the connector for connection.
     *
     * DRM_CONNECTOR_POLL_DISCONNECT
     *     Periodically poll the connector for disconnection, without
     *     causing flickering even when the connector is in use. DACs should
     *     rarely do this without a lot of testing.
     *
     * Set to 0 for connectors that don't support connection status
     * discovery.
     */
    uint8_t polled;

    /**
     * @dpms: Current dpms state. For legacy drivers the
     * &drm_connector_funcs.dpms callback must update this. For atomic
     * drivers, this is handled by the core atomic code, and drivers must
     * only take &drm_crtc_state.active into account.
     */
    int dpms;

    /** @helper_private: mid-layer private data */
    const struct drm_connector_helper_funcs *helper_private;

    /** @cmdline_mode: mode line parsed from the kernel cmdline for this connector */
    struct drm_cmdline_mode cmdline_mode;
    /** @force: a DRM_FORCE_<foo> state for forced mode sets */
    enum drm_connector_force force;
    /** @override_edid: has the EDID been overwritten through debugfs for testing? */
    bool override_edid;
    /** @epoch_counter: used to detect any other changes in connector, besides status */
    u64 epoch_counter;

    /**
     * @possible_encoders: Bit mask of encoders that can drive this
     * connector, drm_encoder_index() determines the index into the bitfield
     * and the bits are set with drm_connector_attach_encoder().
     */
    u32 possible_encoders;

    /**
     * @encoder: Currently bound encoder driving this connector, if any.
     * Only really meaningful for non-atomic drivers. Atomic drivers should
     * instead look at &drm_connector_state.best_encoder, and in case they
     * need the CRTC driving this output, &drm_connector_state.crtc.
     */
    struct drm_encoder *encoder;

#define MAX_ELD_BYTES 128
    /** @eld: EDID-like data, if present */
    uint8_t eld[MAX_ELD_BYTES];
    /** @latency_present: AV delay info from ELD, if found */
    bool latency_present[2];
    /**
     * @video_latency: Video latency info from ELD, if found.
     * [0]: progressive, [1]: interlaced
     */
    int video_latency[2];
    /**
     * @audio_latency: audio latency info from ELD, if found
     * [0]: progressive, [1]: interlaced
     */
    int audio_latency[2];

    /**
     * @ddc: associated ddc adapter.
     * A connector usually has its associated ddc adapter. If a driver uses
     * this field, then an appropriate symbolic link is created in connector
     * sysfs directory to make it easy for the user to tell which i2c
     * adapter is for a particular display.
     *
     * The field should be set by calling drm_connector_init_with_ddc().
     */
    struct i2c_adapter *ddc;

    /**
     * @null_edid_counter: track sinks that give us all zeros for the EDID.
     * Needed to workaround some HW bugs where we get all 0s
     */
    int null_edid_counter;

    /** @bad_edid_counter: track sinks that give us an EDID with invalid checksum */
    unsigned bad_edid_counter;

    /**
     * @edid_corrupt: Indicates whether the last read EDID was corrupt. Used
     * in Displayport compliance testing - Displayport Link CTS Core 1.2
     * rev1.1 4.2.2.6
     */
    bool edid_corrupt;
    /**
     * @real_edid_checksum: real edid checksum for corrupted edid block.
     * Required in Displayport 1.4 compliance testing
     * rev1.1 4.2.2.6
     */
    u8 real_edid_checksum;

    /** @debugfs_entry: debugfs directory for this connector */
    struct dentry *debugfs_entry;

    /**
     * @state:
     *
     * Current atomic state for this connector.
     *
     * This is protected by &drm_mode_config.connection_mutex. Note that
     * nonblocking atomic commits access the current connector state without
     * taking locks. Either by going through the &struct drm_atomic_state
     * pointers, see for_each_oldnew_connector_in_state(),
     * for_each_old_connector_in_state() and
     * for_each_new_connector_in_state(). Or through careful ordering of
     * atomic commit operations as implemented in the atomic helpers, see
     * &struct drm_crtc_commit.
     */
    struct drm_connector_state *state;

    /* DisplayID bits. Extract into a substruct? */

    /**
     * @tile_blob_ptr:
     *
     * DRM blob property data for the tile property (used mostly by DP MST).
     * This is meant for screens which are driven through separate display
     * pipelines represented by &drm_crtc, which might not be running with
     * genlocked clocks. For tiled panels which are genlocked, like
     * dual-link LVDS or dual-link DSI, the driver should try to not expose
     * the tiling and virtualize both &drm_crtc and &drm_plane if needed.
     *
     * This should only be updated by calling
     * drm_connector_set_tile_property().
     */
    struct drm_property_blob *tile_blob_ptr;

    /** @has_tile: is this connector connected to a tiled monitor */
    bool has_tile;
    /** @tile_group: tile group for the connected monitor */
    struct drm_tile_group *tile_group;
    /** @tile_is_single_monitor: whether the tile is one monitor housing */
    bool tile_is_single_monitor;

    /** @num_h_tile: number of horizontal tiles in the tile group */
    /** @num_v_tile: number of vertical tiles in the tile group */
    uint8_t num_h_tile, num_v_tile;
    /** @tile_h_loc: horizontal location of this tile */
    /** @tile_v_loc: vertical location of this tile */
    uint8_t tile_h_loc, tile_v_loc;
    /** @tile_h_size: horizontal size of this tile. */
    /** @tile_v_size: vertical size of this tile. */
    uint16_t tile_h_size, tile_v_size;

    /**
     * @free_node:
     *
     * List used only by &drm_connector_list_iter to be able to clean up a
     * connector from any context, in conjunction with
     * &drm_mode_config.connector_free_work.
     */
    struct llist_node free_node;

    /** @hdr_sink_metadata: HDR Metadata Information read from sink */
    struct hdr_sink_metadata hdr_sink_metadata;
};

#define obj_to_connector(x) container_of(x, struct drm_connector, base)

int drm_connector_init(struct drm_device *dev, struct drm_connector *connector, const struct drm_connector_funcs *funcs,
                       int connector_type);
int drm_connector_init_with_ddc(struct drm_device *dev, struct drm_connector *connector,
                                const struct drm_connector_funcs *funcs, int connector_type, struct i2c_adapter *ddc);
void drm_connector_attach_edid_property(struct drm_connector *connector);
int drm_connector_register(struct drm_connector *connector);
void drm_connector_unregister(struct drm_connector *connector);
int drm_connector_attach_encoder(struct drm_connector *connector, struct drm_encoder *encoder);

void drm_connector_cleanup(struct drm_connector *connector);

static inline unsigned int drm_connector_index(const struct drm_connector *connector)
{
    return connector->index;
}

static inline u32 drm_connector_mask(const struct drm_connector *connector)
{
    return 1 << connector->index;
}

/**
 * drm_connector_lookup - lookup connector object
 * @dev: DRM device
 * @file_priv: drm file to check for lease against.
 * @id: connector object id
 *
 * This function looks up the connector object specified by id
 * add takes a reference to it.
 */
static inline struct drm_connector *drm_connector_lookup(struct drm_device *dev, struct drm_file *file_priv,
                                                         uint32_t id)
{
    struct drm_mode_object *mo;
    mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_CONNECTOR);
    return mo ? obj_to_connector(mo) : NULL;
}

/**
 * drm_connector_get - acquire a connector reference
 * @connector: DRM connector
 *
 * This function increments the connector's refcount.
 */
static inline void drm_connector_get(struct drm_connector *connector)
{
    drm_mode_object_get(&connector->base);
}

/**
 * drm_connector_put - release a connector reference
 * @connector: DRM connector
 *
 * This function decrements the connector's reference count and frees the
 * object if the reference count drops to zero.
 */
static inline void drm_connector_put(struct drm_connector *connector)
{
    drm_mode_object_put(&connector->base);
}

/**
 * drm_connector_is_unregistered - has the connector been unregistered from
 * userspace?
 * @connector: DRM connector
 *
 * Checks whether or not @connector has been unregistered from userspace.
 *
 * Returns:
 * True if the connector was unregistered, false if the connector is
 * registered or has not yet been registered with userspace.
 */
static inline bool drm_connector_is_unregistered(struct drm_connector *connector)
{
    return READ_ONCE(connector->registration_state) == DRM_CONNECTOR_UNREGISTERED;
}

void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode);
const char *drm_get_connector_type_name(unsigned int connector_type);
const char *drm_get_connector_status_name(enum drm_connector_status status);
const char *drm_get_subpixel_order_name(enum subpixel_order order);
const char *drm_get_dpms_name(int val);
const char *drm_get_dvi_i_subconnector_name(int val);
const char *drm_get_dvi_i_select_name(int val);
const char *drm_get_tv_subconnector_name(int val);
const char *drm_get_tv_select_name(int val);
const char *drm_get_dp_subconnector_name(int val);
const char *drm_get_content_protection_name(int val);
const char *drm_get_hdcp_content_type_name(int val);

int drm_mode_create_dvi_i_properties(struct drm_device *dev);
void drm_connector_attach_dp_subconnector_property(struct drm_connector *connector);

int drm_mode_create_tv_margin_properties(struct drm_device *dev);
int drm_mode_create_tv_properties(struct drm_device *dev, unsigned int num_modes, const char *const modes[]);
void drm_connector_attach_tv_margin_properties(struct drm_connector *conn);
int drm_mode_create_scaling_mode_property(struct drm_device *dev);
int drm_connector_attach_content_type_property(struct drm_connector *dev);
int drm_connector_attach_scaling_mode_property(struct drm_connector *connector, u32 scaling_mode_mask);
int drm_connector_attach_vrr_capable_property(struct drm_connector *connector);
int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
int drm_mode_create_hdmi_colorspace_property(struct drm_connector *connector);
int drm_mode_create_dp_colorspace_property(struct drm_connector *connector);
int drm_mode_create_content_type_property(struct drm_device *dev);
void drm_hdmi_avi_infoframe_content_type(struct hdmi_avi_infoframe *frame,
                                         const struct drm_connector_state *conn_state);

int drm_mode_create_suggested_offset_properties(struct drm_device *dev);

int drm_connector_set_path_property(struct drm_connector *connector, const char *path);
int drm_connector_set_tile_property(struct drm_connector *connector);
int drm_connector_update_edid_property(struct drm_connector *connector, const struct edid *edid);
void drm_connector_set_link_status_property(struct drm_connector *connector, uint64_t link_status);
void drm_connector_set_vrr_capable_property(struct drm_connector *connector, bool capable);
int drm_connector_set_panel_orientation(struct drm_connector *connector, enum drm_panel_orientation panel_orientation);
int drm_connector_set_panel_orientation_with_quirk(struct drm_connector *connector,
                                                   enum drm_panel_orientation panel_orientation, int width, int height);
int drm_connector_attach_max_bpc_property(struct drm_connector *connector, int min, int max);

/**
 * struct drm_tile_group - Tile group metadata
 * @refcount: reference count
 * @dev: DRM device
 * @id: tile group id exposed to userspace
 * @group_data: Sink-private data identifying this group
 *
 * @group_data corresponds to displayid vend/prod/serial for external screens
 * with an EDID.
 */
struct drm_tile_group {
    struct kref refcount;
    struct drm_device *dev;
    int id;
    u8 group_data[8];
};

struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev, const char topology[8]);
struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev, const char topology[8]);
void drm_mode_put_tile_group(struct drm_device *dev, struct drm_tile_group *tg);

/**
 * struct drm_connector_list_iter - connector_list iterator
 *
 * This iterator tracks state needed to be able to walk the connector_list
 * within struct drm_mode_config. Only use together with
 * drm_connector_list_iter_begin(), drm_connector_list_iter_end() and
 * drm_connector_list_iter_next() respectively the convenience macro
 * drm_for_each_connector_iter().
 */
struct drm_connector_list_iter {
    /* private: */
    struct drm_device *dev;
    struct drm_connector *conn;
};

void drm_connector_list_iter_begin(struct drm_device *dev, struct drm_connector_list_iter *iter);
struct drm_connector *drm_connector_list_iter_next(struct drm_connector_list_iter *iter);
void drm_connector_list_iter_end(struct drm_connector_list_iter *iter);

bool drm_connector_has_possible_encoder(struct drm_connector *connector, struct drm_encoder *encoder);

/**
 * drm_for_each_connector_iter - connector_list iterator macro
 * @connector: &struct drm_connector pointer used as cursor
 * @iter: &struct drm_connector_list_iter
 *
 * Note that @connector is only valid within the list body, if you want to use
 * @connector after calling drm_connector_list_iter_end() then you need to grab
 * your own reference first using drm_connector_get().
 */
#define drm_for_each_connector_iter(connector, iter) while (((connector) = drm_connector_list_iter_next(iter)))

/**
 * drm_connector_for_each_possible_encoder - iterate connector's possible encoders
 * @connector: &struct drm_connector pointer
 * @encoder: &struct drm_encoder pointer used as cursor
 */
#define drm_connector_for_each_possible_encoder(connector, encoder)                                                    \
    drm_for_each_encoder_mask(encoder, (connector)->dev, (connector)->possible_encoders)

#endif