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 /*
  * 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 <linux/notifier.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_panel;
 struct drm_property;
 struct drm_property_blob;
 struct drm_printer;
 struct drm_privacy_screen;
 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_state - 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;
 };
 
 /**
  * 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;
 };
 
 /**
  * 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;
 
     /** @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;
 };
 
 /**
  * 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 {
     u16 min_vfreq;
     u16 max_vfreq;
 };
 
 /**
  * enum drm_privacy_screen_status - privacy screen status
  *
  * This enum is used to track and control the state of the integrated privacy
  * screen present on some display panels, via the "privacy-screen sw-state"
  * and "privacy-screen hw-state" properties. Note the _LOCKED enum values
  * are only valid for the "privacy-screen hw-state" property.
  *
  * @PRIVACY_SCREEN_DISABLED:
  *  The privacy-screen on the panel is disabled
  * @PRIVACY_SCREEN_ENABLED:
  *  The privacy-screen on the panel is enabled
  * @PRIVACY_SCREEN_DISABLED_LOCKED:
  *  The privacy-screen on the panel is disabled and locked (cannot be changed)
  * @PRIVACY_SCREEN_ENABLED_LOCKED:
  *  The privacy-screen on the panel is enabled and locked (cannot be changed)
  */
 enum drm_privacy_screen_status {
     PRIVACY_SCREEN_DISABLED = 0,
     PRIVACY_SCREEN_ENABLED,
     PRIVACY_SCREEN_DISABLED_LOCKED,
     PRIVACY_SCREEN_ENABLED_LOCKED,
 };
 
 /*
  * 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 = DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
 
     /**
      * @DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE:
      *
      * Data is sampled on the falling edge of the pixel clock
      */
     DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE = DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE,
 
     /**
      * @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_YCBCR444   (1<<1)
 #define DRM_COLOR_FORMAT_YCBCR422   (1<<2)
 #define DRM_COLOR_FORMAT_YCBCR420   (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_rgb444_dc_modes: Mask of supported hdmi deep color modes
      * in RGB 4:4:4. Even more stuff redundant with @bus_formats.
      */
     u8 edid_hdmi_rgb444_dc_modes;
 
     /**
      * @edid_hdmi_ycbcr444_dc_modes: Mask of supported hdmi deep color
      * modes in YCbCr 4:4:4. Even more stuff redundant with @bus_formats.
      */
     u8 edid_hdmi_ycbcr444_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;
 
     /**
      * @mso_stream_count: eDP Multi-SST Operation (MSO) stream count from
      * the DisplayID VESA vendor block. 0 for conventional Single-Stream
      * Transport (SST), or 2 or 4 MSO streams.
      */
     u8 mso_stream_count;
 
     /**
      * @mso_pixel_overlap: eDP MSO segment pixel overlap, 0-8 pixels.
      */
     u8 mso_pixel_overlap;
 };
 
 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;
 
     /**
      * @privacy_screen_sw_state: See :ref:`Standard Connector
      * Properties<standard_connector_properties>`
      */
     enum drm_privacy_screen_status privacy_screen_sw_state;
 
     /**
      * @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.
      *
      * FIXME:
      *
      * 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.
      *
      * Also note that this callback can be called no matter the
      * state the connector is in. Drivers that need the underlying
      * device to be powered to perform the detection will first need
      * to make sure it's been properly enabled.
      *
      * 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.
      *
      * FIXME:
      *
      * 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);
 
     /**
      * @oob_hotplug_event:
      *
      * This will get called when a hotplug-event for a drm-connector
      * has been received from a source outside the display driver / device.
      */
     void (*oob_hotplug_event)(struct drm_connector *connector);
 
     /**
      * @debugfs_init:
      *
      * Allows connectors to create connector-specific debugfs files.
      */
     void (*debugfs_init)(struct drm_connector *connector, struct dentry *root);
 };
 
 /**
  * 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;
     /**
      * @fwnode: associated fwnode supplied by platform firmware
      *
      * Drivers can set this to associate a fwnode with a connector, drivers
      * are expected to get a reference on the fwnode when setting this.
      * drm_connector_cleanup() will call fwnode_handle_put() on this.
      */
     struct fwnode_handle *fwnode;
 
     /**
      * @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;
 
     /**
      * @global_connector_list_entry:
      *
      * Connector entry in the global connector-list, used by
      * drm_connector_find_by_fwnode().
      */
     struct list_head global_connector_list_entry;
 
     /** @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;
 
     /** @privacy_screen: drm_privacy_screen for this connector, or NULL. */
     struct drm_privacy_screen *privacy_screen;
 
     /** @privacy_screen_notifier: privacy-screen notifier_block */
     struct notifier_block privacy_screen_notifier;
 
     /**
      * @privacy_screen_sw_state_property: Optional atomic property for the
      * connector to control the integrated privacy screen.
      */
     struct drm_property *privacy_screen_sw_state_property;
 
     /**
      * @privacy_screen_hw_state_property: Optional atomic property for the
      * connector to report the actual integrated privacy screen state.
      */
     struct drm_property *privacy_screen_hw_state_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? Do not modify outside of drm_edid_override_set() and
      * drm_edid_override_reset().
      */
     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. FIXME: 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_connector_attach_colorspace_property(struct drm_connector *connector);
 int drm_connector_attach_hdr_output_metadata_property(struct drm_connector *connector);
 bool drm_connector_atomic_hdr_metadata_equal(struct drm_connector_state *old_state,
                          struct drm_connector_state *new_state);
 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);
 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_set_orientation_from_panel(
     struct drm_connector *connector,
     struct drm_panel *panel);
 int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
                       int min, int max);
 void drm_connector_create_privacy_screen_properties(struct drm_connector *conn);
 void drm_connector_attach_privacy_screen_properties(struct drm_connector *conn);
 void drm_connector_attach_privacy_screen_provider(
     struct drm_connector *connector, struct drm_privacy_screen *priv);
 void drm_connector_update_privacy_screen(const struct drm_connector_state *connector_state);
 
 /**
  * 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().
  *
  * Note that the return value of drm_connector_list_iter_next() is only valid
  * up to the next drm_connector_list_iter_next() or
  * drm_connector_list_iter_end() call. If you want to use the connector later,
  * then you need to grab your own reference first using drm_connector_get().
  */
 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

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