1 /*
2  * Copyright (c) 2016 Intel Corporation
3  *
4  * Permission to use, copy, modify, distribute, and sell this software and its
5  * documentation for any purpose is hereby granted without fee, provided that
6  * the above copyright notice appear in all copies and that both that copyright
7  * notice and this permission notice appear in supporting documentation, and
8  * that the name of the copyright holders not be used in advertising or
9  * publicity pertaining to distribution of the software without specific,
10  * written prior permission.  The copyright holders make no representations
11  * about the suitability of this software for any purpose.  It is provided "as
12  * is" without express or implied warranty.
13  *
14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20  * OF THIS SOFTWARE.
21  */
22 
23 #ifndef __DRM_CONNECTOR_H__
24 #define __DRM_CONNECTOR_H__
25 
26 #include <linux/list.h>
27 #include <linux/llist.h>
28 #include <linux/ctype.h>
29 #include <linux/hdmi.h>
30 #include <linux/notifier.h>
31 #include <drm/drm_mode_object.h>
32 #include <drm/drm_util.h>
33 
34 #include <uapi/drm/drm_mode.h>
35 
36 struct drm_connector_helper_funcs;
37 struct drm_modeset_acquire_ctx;
38 struct drm_device;
39 struct drm_crtc;
40 struct drm_encoder;
41 struct drm_panel;
42 struct drm_property;
43 struct drm_property_blob;
44 struct drm_printer;
45 struct drm_privacy_screen;
46 struct edid;
47 struct i2c_adapter;
48 
49 enum drm_connector_force {
50 	DRM_FORCE_UNSPECIFIED,
51 	DRM_FORCE_OFF,
52 	DRM_FORCE_ON,         /* force on analog part normally */
53 	DRM_FORCE_ON_DIGITAL, /* for DVI-I use digital connector */
54 };
55 
56 /**
57  * enum drm_connector_status - status for a &drm_connector
58  *
59  * This enum is used to track the connector status. There are no separate
60  * #defines for the uapi!
61  */
62 enum drm_connector_status {
63 	/**
64 	 * @connector_status_connected: The connector is definitely connected to
65 	 * a sink device, and can be enabled.
66 	 */
67 	connector_status_connected = 1,
68 	/**
69 	 * @connector_status_disconnected: The connector isn't connected to a
70 	 * sink device which can be autodetect. For digital outputs like DP or
71 	 * HDMI (which can be realiable probed) this means there's really
72 	 * nothing there. It is driver-dependent whether a connector with this
73 	 * status can be lit up or not.
74 	 */
75 	connector_status_disconnected = 2,
76 	/**
77 	 * @connector_status_unknown: The connector's status could not be
78 	 * reliably detected. This happens when probing would either cause
79 	 * flicker (like load-detection when the connector is in use), or when a
80 	 * hardware resource isn't available (like when load-detection needs a
81 	 * free CRTC). It should be possible to light up the connector with one
82 	 * of the listed fallback modes. For default configuration userspace
83 	 * should only try to light up connectors with unknown status when
84 	 * there's not connector with @connector_status_connected.
85 	 */
86 	connector_status_unknown = 3,
87 };
88 
89 /**
90  * enum drm_connector_registration_state - userspace registration status for
91  * a &drm_connector
92  *
93  * This enum is used to track the status of initializing a connector and
94  * registering it with userspace, so that DRM can prevent bogus modesets on
95  * connectors that no longer exist.
96  */
97 enum drm_connector_registration_state {
98 	/**
99 	 * @DRM_CONNECTOR_INITIALIZING: The connector has just been created,
100 	 * but has yet to be exposed to userspace. There should be no
101 	 * additional restrictions to how the state of this connector may be
102 	 * modified.
103 	 */
104 	DRM_CONNECTOR_INITIALIZING = 0,
105 
106 	/**
107 	 * @DRM_CONNECTOR_REGISTERED: The connector has been fully initialized
108 	 * and registered with sysfs, as such it has been exposed to
109 	 * userspace. There should be no additional restrictions to how the
110 	 * state of this connector may be modified.
111 	 */
112 	DRM_CONNECTOR_REGISTERED = 1,
113 
114 	/**
115 	 * @DRM_CONNECTOR_UNREGISTERED: The connector has either been exposed
116 	 * to userspace and has since been unregistered and removed from
117 	 * userspace, or the connector was unregistered before it had a chance
118 	 * to be exposed to userspace (e.g. still in the
119 	 * @DRM_CONNECTOR_INITIALIZING state). When a connector is
120 	 * unregistered, there are additional restrictions to how its state
121 	 * may be modified:
122 	 *
123 	 * - An unregistered connector may only have its DPMS changed from
124 	 *   On->Off. Once DPMS is changed to Off, it may not be switched back
125 	 *   to On.
126 	 * - Modesets are not allowed on unregistered connectors, unless they
127 	 *   would result in disabling its assigned CRTCs. This means
128 	 *   disabling a CRTC on an unregistered connector is OK, but enabling
129 	 *   one is not.
130 	 * - Removing a CRTC from an unregistered connector is OK, but new
131 	 *   CRTCs may never be assigned to an unregistered connector.
132 	 */
133 	DRM_CONNECTOR_UNREGISTERED = 2,
134 };
135 
136 enum subpixel_order {
137 	SubPixelUnknown = 0,
138 	SubPixelHorizontalRGB,
139 	SubPixelHorizontalBGR,
140 	SubPixelVerticalRGB,
141 	SubPixelVerticalBGR,
142 	SubPixelNone,
143 
144 };
145 
146 /**
147  * struct drm_scrambling: sink's scrambling support.
148  */
149 struct drm_scrambling {
150 	/**
151 	 * @supported: scrambling supported for rates > 340 Mhz.
152 	 */
153 	bool supported;
154 	/**
155 	 * @low_rates: scrambling supported for rates <= 340 Mhz.
156 	 */
157 	bool low_rates;
158 };
159 
160 /*
161  * struct drm_scdc - Information about scdc capabilities of a HDMI 2.0 sink
162  *
163  * Provides SCDC register support and capabilities related information on a
164  * HDMI 2.0 sink. In case of a HDMI 1.4 sink, all parameter must be 0.
165  */
166 struct drm_scdc {
167 	/**
168 	 * @supported: status control & data channel present.
169 	 */
170 	bool supported;
171 	/**
172 	 * @read_request: sink is capable of generating scdc read request.
173 	 */
174 	bool read_request;
175 	/**
176 	 * @scrambling: sink's scrambling capabilities
177 	 */
178 	struct drm_scrambling scrambling;
179 };
180 
181 /**
182  * struct drm_hdmi_dsc_cap - DSC capabilities of HDMI sink
183  *
184  * Describes the DSC support provided by HDMI 2.1 sink.
185  * The information is fetched fom additional HFVSDB blocks defined
186  * for HDMI 2.1.
187  */
188 struct drm_hdmi_dsc_cap {
189 	/** @v_1p2: flag for dsc1.2 version support by sink */
190 	bool v_1p2;
191 
192 	/** @native_420: Does sink support DSC with 4:2:0 compression */
193 	bool native_420;
194 
195 	/**
196 	 * @all_bpp: Does sink support all bpp with 4:4:4: or 4:2:2
197 	 * compressed formats
198 	 */
199 	bool all_bpp;
200 
201 	/**
202 	 * @bpc_supported: compressed bpc supported by sink : 10, 12 or 16 bpc
203 	 */
204 	u8 bpc_supported;
205 
206 	/** @max_slices: maximum number of Horizontal slices supported by */
207 	u8 max_slices;
208 
209 	/** @clk_per_slice : max pixel clock in MHz supported per slice */
210 	int clk_per_slice;
211 
212 	/** @max_lanes : dsc max lanes supported for Fixed rate Link training */
213 	u8 max_lanes;
214 
215 	/** @max_frl_rate_per_lane : maximum frl rate with DSC per lane */
216 	u8 max_frl_rate_per_lane;
217 
218 	/** @total_chunk_kbytes: max size of chunks in KBs supported per line*/
219 	u8 total_chunk_kbytes;
220 };
221 
222 /**
223  * struct drm_hdmi_info - runtime information about the connected HDMI sink
224  *
225  * Describes if a given display supports advanced HDMI 2.0 features.
226  * This information is available in CEA-861-F extension blocks (like HF-VSDB).
227  */
228 struct drm_hdmi_info {
229 	/** @scdc: sink's scdc support and capabilities */
230 	struct drm_scdc scdc;
231 
232 	/**
233 	 * @y420_vdb_modes: bitmap of modes which can support ycbcr420
234 	 * output only (not normal RGB/YCBCR444/422 outputs). The max VIC
235 	 * defined by the CEA-861-G spec is 219, so the size is 256 bits to map
236 	 * up to 256 VICs.
237 	 */
238 	unsigned long y420_vdb_modes[BITS_TO_LONGS(256)];
239 
240 	/**
241 	 * @y420_cmdb_modes: bitmap of modes which can support ycbcr420
242 	 * output also, along with normal HDMI outputs. The max VIC defined by
243 	 * the CEA-861-G spec is 219, so the size is 256 bits to map up to 256
244 	 * VICs.
245 	 */
246 	unsigned long y420_cmdb_modes[BITS_TO_LONGS(256)];
247 
248 	/** @y420_cmdb_map: bitmap of SVD index, to extraxt vcb modes */
249 	u64 y420_cmdb_map;
250 
251 	/** @y420_dc_modes: bitmap of deep color support index */
252 	u8 y420_dc_modes;
253 
254 	/** @max_frl_rate_per_lane: support fixed rate link */
255 	u8 max_frl_rate_per_lane;
256 
257 	/** @max_lanes: supported by sink */
258 	u8 max_lanes;
259 
260 	/** @dsc_cap: DSC capabilities of the sink */
261 	struct drm_hdmi_dsc_cap dsc_cap;
262 };
263 
264 /**
265  * enum drm_link_status - connector's link_status property value
266  *
267  * This enum is used as the connector's link status property value.
268  * It is set to the values defined in uapi.
269  *
270  * @DRM_LINK_STATUS_GOOD: DP Link is Good as a result of successful
271  *                        link training
272  * @DRM_LINK_STATUS_BAD: DP Link is BAD as a result of link training
273  *                       failure
274  */
275 enum drm_link_status {
276 	DRM_LINK_STATUS_GOOD = DRM_MODE_LINK_STATUS_GOOD,
277 	DRM_LINK_STATUS_BAD = DRM_MODE_LINK_STATUS_BAD,
278 };
279 
280 /**
281  * enum drm_panel_orientation - panel_orientation info for &drm_display_info
282  *
283  * This enum is used to track the (LCD) panel orientation. There are no
284  * separate #defines for the uapi!
285  *
286  * @DRM_MODE_PANEL_ORIENTATION_UNKNOWN: The drm driver has not provided any
287  *					panel orientation information (normal
288  *					for non panels) in this case the "panel
289  *					orientation" connector prop will not be
290  *					attached.
291  * @DRM_MODE_PANEL_ORIENTATION_NORMAL:	The top side of the panel matches the
292  *					top side of the device's casing.
293  * @DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP: The top side of the panel matches the
294  *					bottom side of the device's casing, iow
295  *					the panel is mounted upside-down.
296  * @DRM_MODE_PANEL_ORIENTATION_LEFT_UP:	The left side of the panel matches the
297  *					top side of the device's casing.
298  * @DRM_MODE_PANEL_ORIENTATION_RIGHT_UP: The right side of the panel matches the
299  *					top side of the device's casing.
300  */
301 enum drm_panel_orientation {
302 	DRM_MODE_PANEL_ORIENTATION_UNKNOWN = -1,
303 	DRM_MODE_PANEL_ORIENTATION_NORMAL = 0,
304 	DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP,
305 	DRM_MODE_PANEL_ORIENTATION_LEFT_UP,
306 	DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
307 };
308 
309 /**
310  * struct drm_monitor_range_info - Panel's Monitor range in EDID for
311  * &drm_display_info
312  *
313  * This struct is used to store a frequency range supported by panel
314  * as parsed from EDID's detailed monitor range descriptor block.
315  *
316  * @min_vfreq: This is the min supported refresh rate in Hz from
317  *             EDID's detailed monitor range.
318  * @max_vfreq: This is the max supported refresh rate in Hz from
319  *             EDID's detailed monitor range
320  */
321 struct drm_monitor_range_info {
322 	u16 min_vfreq;
323 	u16 max_vfreq;
324 };
325 
326 /**
327  * struct drm_luminance_range_info - Panel's luminance range for
328  * &drm_display_info. Calculated using data in EDID
329  *
330  * This struct is used to store a luminance range supported by panel
331  * as calculated using data from EDID's static hdr metadata.
332  *
333  * @min_luminance: This is the min supported luminance value
334  *
335  * @max_luminance: This is the max supported luminance value
336  */
337 struct drm_luminance_range_info {
338 	u32 min_luminance;
339 	u32 max_luminance;
340 };
341 
342 /**
343  * enum drm_privacy_screen_status - privacy screen status
344  *
345  * This enum is used to track and control the state of the integrated privacy
346  * screen present on some display panels, via the "privacy-screen sw-state"
347  * and "privacy-screen hw-state" properties. Note the _LOCKED enum values
348  * are only valid for the "privacy-screen hw-state" property.
349  *
350  * @PRIVACY_SCREEN_DISABLED:
351  *  The privacy-screen on the panel is disabled
352  * @PRIVACY_SCREEN_ENABLED:
353  *  The privacy-screen on the panel is enabled
354  * @PRIVACY_SCREEN_DISABLED_LOCKED:
355  *  The privacy-screen on the panel is disabled and locked (cannot be changed)
356  * @PRIVACY_SCREEN_ENABLED_LOCKED:
357  *  The privacy-screen on the panel is enabled and locked (cannot be changed)
358  */
359 enum drm_privacy_screen_status {
360 	PRIVACY_SCREEN_DISABLED = 0,
361 	PRIVACY_SCREEN_ENABLED,
362 	PRIVACY_SCREEN_DISABLED_LOCKED,
363 	PRIVACY_SCREEN_ENABLED_LOCKED,
364 };
365 
366 /*
367  * This is a consolidated colorimetry list supported by HDMI and
368  * DP protocol standard. The respective connectors will register
369  * a property with the subset of this list (supported by that
370  * respective protocol). Userspace will set the colorspace through
371  * a colorspace property which will be created and exposed to
372  * userspace.
373  */
374 
375 /* For Default case, driver will set the colorspace */
376 #define DRM_MODE_COLORIMETRY_DEFAULT			0
377 /* CEA 861 Normal Colorimetry options */
378 #define DRM_MODE_COLORIMETRY_NO_DATA			0
379 #define DRM_MODE_COLORIMETRY_SMPTE_170M_YCC		1
380 #define DRM_MODE_COLORIMETRY_BT709_YCC			2
381 /* CEA 861 Extended Colorimetry Options */
382 #define DRM_MODE_COLORIMETRY_XVYCC_601			3
383 #define DRM_MODE_COLORIMETRY_XVYCC_709			4
384 #define DRM_MODE_COLORIMETRY_SYCC_601			5
385 #define DRM_MODE_COLORIMETRY_OPYCC_601			6
386 #define DRM_MODE_COLORIMETRY_OPRGB			7
387 #define DRM_MODE_COLORIMETRY_BT2020_CYCC		8
388 #define DRM_MODE_COLORIMETRY_BT2020_RGB			9
389 #define DRM_MODE_COLORIMETRY_BT2020_YCC			10
390 /* Additional Colorimetry extension added as part of CTA 861.G */
391 #define DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65		11
392 #define DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER		12
393 /* Additional Colorimetry Options added for DP 1.4a VSC Colorimetry Format */
394 #define DRM_MODE_COLORIMETRY_RGB_WIDE_FIXED		13
395 #define DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT		14
396 #define DRM_MODE_COLORIMETRY_BT601_YCC			15
397 
398 /**
399  * enum drm_bus_flags - bus_flags info for &drm_display_info
400  *
401  * This enum defines signal polarities and clock edge information for signals on
402  * a bus as bitmask flags.
403  *
404  * The clock edge information is conveyed by two sets of symbols,
405  * DRM_BUS_FLAGS_*_DRIVE_\* and DRM_BUS_FLAGS_*_SAMPLE_\*. When this enum is
406  * used to describe a bus from the point of view of the transmitter, the
407  * \*_DRIVE_\* flags should be used. When used from the point of view of the
408  * receiver, the \*_SAMPLE_\* flags should be used. The \*_DRIVE_\* and
409  * \*_SAMPLE_\* flags alias each other, with the \*_SAMPLE_POSEDGE and
410  * \*_SAMPLE_NEGEDGE flags being equal to \*_DRIVE_NEGEDGE and \*_DRIVE_POSEDGE
411  * respectively. This simplifies code as signals are usually sampled on the
412  * opposite edge of the driving edge. Transmitters and receivers may however
413  * need to take other signal timings into account to convert between driving
414  * and sample edges.
415  */
416 enum drm_bus_flags {
417 	/**
418 	 * @DRM_BUS_FLAG_DE_LOW:
419 	 *
420 	 * The Data Enable signal is active low
421 	 */
422 	DRM_BUS_FLAG_DE_LOW = BIT(0),
423 
424 	/**
425 	 * @DRM_BUS_FLAG_DE_HIGH:
426 	 *
427 	 * The Data Enable signal is active high
428 	 */
429 	DRM_BUS_FLAG_DE_HIGH = BIT(1),
430 
431 	/**
432 	 * @DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE:
433 	 *
434 	 * Data is driven on the rising edge of the pixel clock
435 	 */
436 	DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE = BIT(2),
437 
438 	/**
439 	 * @DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE:
440 	 *
441 	 * Data is driven on the falling edge of the pixel clock
442 	 */
443 	DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE = BIT(3),
444 
445 	/**
446 	 * @DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE:
447 	 *
448 	 * Data is sampled on the rising edge of the pixel clock
449 	 */
450 	DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE = DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
451 
452 	/**
453 	 * @DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE:
454 	 *
455 	 * Data is sampled on the falling edge of the pixel clock
456 	 */
457 	DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE = DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE,
458 
459 	/**
460 	 * @DRM_BUS_FLAG_DATA_MSB_TO_LSB:
461 	 *
462 	 * Data is transmitted MSB to LSB on the bus
463 	 */
464 	DRM_BUS_FLAG_DATA_MSB_TO_LSB = BIT(4),
465 
466 	/**
467 	 * @DRM_BUS_FLAG_DATA_LSB_TO_MSB:
468 	 *
469 	 * Data is transmitted LSB to MSB on the bus
470 	 */
471 	DRM_BUS_FLAG_DATA_LSB_TO_MSB = BIT(5),
472 
473 	/**
474 	 * @DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE:
475 	 *
476 	 * Sync signals are driven on the rising edge of the pixel clock
477 	 */
478 	DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE = BIT(6),
479 
480 	/**
481 	 * @DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE:
482 	 *
483 	 * Sync signals are driven on the falling edge of the pixel clock
484 	 */
485 	DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE = BIT(7),
486 
487 	/**
488 	 * @DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE:
489 	 *
490 	 * Sync signals are sampled on the rising edge of the pixel clock
491 	 */
492 	DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE = DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE,
493 
494 	/**
495 	 * @DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE:
496 	 *
497 	 * Sync signals are sampled on the falling edge of the pixel clock
498 	 */
499 	DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE = DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE,
500 
501 	/**
502 	 * @DRM_BUS_FLAG_SHARP_SIGNALS:
503 	 *
504 	 *  Set if the Sharp-specific signals (SPL, CLS, PS, REV) must be used
505 	 */
506 	DRM_BUS_FLAG_SHARP_SIGNALS = BIT(8),
507 };
508 
509 /**
510  * struct drm_display_info - runtime data about the connected sink
511  *
512  * Describes a given display (e.g. CRT or flat panel) and its limitations. For
513  * fixed display sinks like built-in panels there's not much difference between
514  * this and &struct drm_connector. But for sinks with a real cable this
515  * structure is meant to describe all the things at the other end of the cable.
516  *
517  * For sinks which provide an EDID this can be filled out by calling
518  * drm_add_edid_modes().
519  */
520 struct drm_display_info {
521 	/**
522 	 * @width_mm: Physical width in mm.
523 	 */
524 	unsigned int width_mm;
525 
526 	/**
527 	 * @height_mm: Physical height in mm.
528 	 */
529 	unsigned int height_mm;
530 
531 	/**
532 	 * @bpc: Maximum bits per color channel. Used by HDMI and DP outputs.
533 	 */
534 	unsigned int bpc;
535 
536 	/**
537 	 * @subpixel_order: Subpixel order of LCD panels.
538 	 */
539 	enum subpixel_order subpixel_order;
540 
541 #define DRM_COLOR_FORMAT_RGB444		(1<<0)
542 #define DRM_COLOR_FORMAT_YCBCR444	(1<<1)
543 #define DRM_COLOR_FORMAT_YCBCR422	(1<<2)
544 #define DRM_COLOR_FORMAT_YCBCR420	(1<<3)
545 
546 	/**
547 	 * @panel_orientation: Read only connector property for built-in panels,
548 	 * indicating the orientation of the panel vs the device's casing.
549 	 * drm_connector_init() sets this to DRM_MODE_PANEL_ORIENTATION_UNKNOWN.
550 	 * When not UNKNOWN this gets used by the drm_fb_helpers to rotate the
551 	 * fb to compensate and gets exported as prop to userspace.
552 	 */
553 	int panel_orientation;
554 
555 	/**
556 	 * @color_formats: HDMI Color formats, selects between RGB and YCrCb
557 	 * modes. Used DRM_COLOR_FORMAT\_ defines, which are _not_ the same ones
558 	 * as used to describe the pixel format in framebuffers, and also don't
559 	 * match the formats in @bus_formats which are shared with v4l.
560 	 */
561 	u32 color_formats;
562 
563 	/**
564 	 * @bus_formats: Pixel data format on the wire, somewhat redundant with
565 	 * @color_formats. Array of size @num_bus_formats encoded using
566 	 * MEDIA_BUS_FMT\_ defines shared with v4l and media drivers.
567 	 */
568 	const u32 *bus_formats;
569 	/**
570 	 * @num_bus_formats: Size of @bus_formats array.
571 	 */
572 	unsigned int num_bus_formats;
573 
574 	/**
575 	 * @bus_flags: Additional information (like pixel signal polarity) for
576 	 * the pixel data on the bus, using &enum drm_bus_flags values
577 	 * DRM_BUS_FLAGS\_.
578 	 */
579 	u32 bus_flags;
580 
581 	/**
582 	 * @max_tmds_clock: Maximum TMDS clock rate supported by the
583 	 * sink in kHz. 0 means undefined.
584 	 */
585 	int max_tmds_clock;
586 
587 	/**
588 	 * @dvi_dual: Dual-link DVI sink?
589 	 */
590 	bool dvi_dual;
591 
592 	/**
593 	 * @is_hdmi: True if the sink is an HDMI device.
594 	 *
595 	 * This field shall be used instead of calling
596 	 * drm_detect_hdmi_monitor() when possible.
597 	 */
598 	bool is_hdmi;
599 
600 	/**
601 	 * @has_hdmi_infoframe: Does the sink support the HDMI infoframe?
602 	 */
603 	bool has_hdmi_infoframe;
604 
605 	/**
606 	 * @rgb_quant_range_selectable: Does the sink support selecting
607 	 * the RGB quantization range?
608 	 */
609 	bool rgb_quant_range_selectable;
610 
611 	/**
612 	 * @edid_hdmi_rgb444_dc_modes: Mask of supported hdmi deep color modes
613 	 * in RGB 4:4:4. Even more stuff redundant with @bus_formats.
614 	 */
615 	u8 edid_hdmi_rgb444_dc_modes;
616 
617 	/**
618 	 * @edid_hdmi_ycbcr444_dc_modes: Mask of supported hdmi deep color
619 	 * modes in YCbCr 4:4:4. Even more stuff redundant with @bus_formats.
620 	 */
621 	u8 edid_hdmi_ycbcr444_dc_modes;
622 
623 	/**
624 	 * @cea_rev: CEA revision of the HDMI sink.
625 	 */
626 	u8 cea_rev;
627 
628 	/**
629 	 * @hdmi: advance features of a HDMI sink.
630 	 */
631 	struct drm_hdmi_info hdmi;
632 
633 	/**
634 	 * @non_desktop: Non desktop display (HMD).
635 	 */
636 	bool non_desktop;
637 
638 	/**
639 	 * @monitor_range: Frequency range supported by monitor range descriptor
640 	 */
641 	struct drm_monitor_range_info monitor_range;
642 
643 	/**
644 	 * @luminance_range: Luminance range supported by panel
645 	 */
646 	struct drm_luminance_range_info luminance_range;
647 
648 	/**
649 	 * @mso_stream_count: eDP Multi-SST Operation (MSO) stream count from
650 	 * the DisplayID VESA vendor block. 0 for conventional Single-Stream
651 	 * Transport (SST), or 2 or 4 MSO streams.
652 	 */
653 	u8 mso_stream_count;
654 
655 	/**
656 	 * @mso_pixel_overlap: eDP MSO segment pixel overlap, 0-8 pixels.
657 	 */
658 	u8 mso_pixel_overlap;
659 
660 	/**
661 	 * @max_dsc_bpp: Maximum DSC target bitrate, if it is set to 0 the
662 	 * monitor's default value is used instead.
663 	 */
664 	u32 max_dsc_bpp;
665 };
666 
667 int drm_display_info_set_bus_formats(struct drm_display_info *info,
668 				     const u32 *formats,
669 				     unsigned int num_formats);
670 
671 /**
672  * struct drm_connector_tv_margins - TV connector related margins
673  *
674  * Describes the margins in pixels to put around the image on TV
675  * connectors to deal with overscan.
676  */
677 struct drm_connector_tv_margins {
678 	/**
679 	 * @bottom: Bottom margin in pixels.
680 	 */
681 	unsigned int bottom;
682 
683 	/**
684 	 * @left: Left margin in pixels.
685 	 */
686 	unsigned int left;
687 
688 	/**
689 	 * @right: Right margin in pixels.
690 	 */
691 	unsigned int right;
692 
693 	/**
694 	 * @top: Top margin in pixels.
695 	 */
696 	unsigned int top;
697 };
698 
699 /**
700  * struct drm_tv_connector_state - TV connector related states
701  * @subconnector: selected subconnector
702  * @margins: TV margins
703  * @mode: TV mode
704  * @brightness: brightness in percent
705  * @contrast: contrast in percent
706  * @flicker_reduction: flicker reduction in percent
707  * @overscan: overscan in percent
708  * @saturation: saturation in percent
709  * @hue: hue in percent
710  */
711 struct drm_tv_connector_state {
712 	enum drm_mode_subconnector subconnector;
713 	struct drm_connector_tv_margins margins;
714 	unsigned int mode;
715 	unsigned int brightness;
716 	unsigned int contrast;
717 	unsigned int flicker_reduction;
718 	unsigned int overscan;
719 	unsigned int saturation;
720 	unsigned int hue;
721 };
722 
723 /**
724  * struct drm_connector_state - mutable connector state
725  */
726 struct drm_connector_state {
727 	/** @connector: backpointer to the connector */
728 	struct drm_connector *connector;
729 
730 	/**
731 	 * @crtc: CRTC to connect connector to, NULL if disabled.
732 	 *
733 	 * Do not change this directly, use drm_atomic_set_crtc_for_connector()
734 	 * instead.
735 	 */
736 	struct drm_crtc *crtc;
737 
738 	/**
739 	 * @best_encoder:
740 	 *
741 	 * Used by the atomic helpers to select the encoder, through the
742 	 * &drm_connector_helper_funcs.atomic_best_encoder or
743 	 * &drm_connector_helper_funcs.best_encoder callbacks.
744 	 *
745 	 * This is also used in the atomic helpers to map encoders to their
746 	 * current and previous connectors, see
747 	 * drm_atomic_get_old_connector_for_encoder() and
748 	 * drm_atomic_get_new_connector_for_encoder().
749 	 *
750 	 * NOTE: Atomic drivers must fill this out (either themselves or through
751 	 * helpers), for otherwise the GETCONNECTOR and GETENCODER IOCTLs will
752 	 * not return correct data to userspace.
753 	 */
754 	struct drm_encoder *best_encoder;
755 
756 	/**
757 	 * @link_status: Connector link_status to keep track of whether link is
758 	 * GOOD or BAD to notify userspace if retraining is necessary.
759 	 */
760 	enum drm_link_status link_status;
761 
762 	/** @state: backpointer to global drm_atomic_state */
763 	struct drm_atomic_state *state;
764 
765 	/**
766 	 * @commit: Tracks the pending commit to prevent use-after-free conditions.
767 	 *
768 	 * Is only set when @crtc is NULL.
769 	 */
770 	struct drm_crtc_commit *commit;
771 
772 	/** @tv: TV connector state */
773 	struct drm_tv_connector_state tv;
774 
775 	/**
776 	 * @self_refresh_aware:
777 	 *
778 	 * This tracks whether a connector is aware of the self refresh state.
779 	 * It should be set to true for those connector implementations which
780 	 * understand the self refresh state. This is needed since the crtc
781 	 * registers the self refresh helpers and it doesn't know if the
782 	 * connectors downstream have implemented self refresh entry/exit.
783 	 *
784 	 * Drivers should set this to true in atomic_check if they know how to
785 	 * handle self_refresh requests.
786 	 */
787 	bool self_refresh_aware;
788 
789 	/**
790 	 * @picture_aspect_ratio: Connector property to control the
791 	 * HDMI infoframe aspect ratio setting.
792 	 *
793 	 * The %DRM_MODE_PICTURE_ASPECT_\* values much match the
794 	 * values for &enum hdmi_picture_aspect
795 	 */
796 	enum hdmi_picture_aspect picture_aspect_ratio;
797 
798 	/**
799 	 * @content_type: Connector property to control the
800 	 * HDMI infoframe content type setting.
801 	 * The %DRM_MODE_CONTENT_TYPE_\* values much
802 	 * match the values.
803 	 */
804 	unsigned int content_type;
805 
806 	/**
807 	 * @hdcp_content_type: Connector property to pass the type of
808 	 * protected content. This is most commonly used for HDCP.
809 	 */
810 	unsigned int hdcp_content_type;
811 
812 	/**
813 	 * @scaling_mode: Connector property to control the
814 	 * upscaling, mostly used for built-in panels.
815 	 */
816 	unsigned int scaling_mode;
817 
818 	/**
819 	 * @content_protection: Connector property to request content
820 	 * protection. This is most commonly used for HDCP.
821 	 */
822 	unsigned int content_protection;
823 
824 	/**
825 	 * @colorspace: State variable for Connector property to request
826 	 * colorspace change on Sink. This is most commonly used to switch
827 	 * to wider color gamuts like BT2020.
828 	 */
829 	u32 colorspace;
830 
831 	/**
832 	 * @writeback_job: Writeback job for writeback connectors
833 	 *
834 	 * Holds the framebuffer and out-fence for a writeback connector. As
835 	 * the writeback completion may be asynchronous to the normal commit
836 	 * cycle, the writeback job lifetime is managed separately from the
837 	 * normal atomic state by this object.
838 	 *
839 	 * See also: drm_writeback_queue_job() and
840 	 * drm_writeback_signal_completion()
841 	 */
842 	struct drm_writeback_job *writeback_job;
843 
844 	/**
845 	 * @max_requested_bpc: Connector property to limit the maximum bit
846 	 * depth of the pixels.
847 	 */
848 	u8 max_requested_bpc;
849 
850 	/**
851 	 * @max_bpc: Connector max_bpc based on the requested max_bpc property
852 	 * and the connector bpc limitations obtained from edid.
853 	 */
854 	u8 max_bpc;
855 
856 	/**
857 	 * @privacy_screen_sw_state: See :ref:`Standard Connector
858 	 * Properties<standard_connector_properties>`
859 	 */
860 	enum drm_privacy_screen_status privacy_screen_sw_state;
861 
862 	/**
863 	 * @hdr_output_metadata:
864 	 * DRM blob property for HDR output metadata
865 	 */
866 	struct drm_property_blob *hdr_output_metadata;
867 };
868 
869 /**
870  * struct drm_connector_funcs - control connectors on a given device
871  *
872  * Each CRTC may have one or more connectors attached to it.  The functions
873  * below allow the core DRM code to control connectors, enumerate available modes,
874  * etc.
875  */
876 struct drm_connector_funcs {
877 	/**
878 	 * @dpms:
879 	 *
880 	 * Legacy entry point to set the per-connector DPMS state. Legacy DPMS
881 	 * is exposed as a standard property on the connector, but diverted to
882 	 * this callback in the drm core. Note that atomic drivers don't
883 	 * implement the 4 level DPMS support on the connector any more, but
884 	 * instead only have an on/off "ACTIVE" property on the CRTC object.
885 	 *
886 	 * This hook is not used by atomic drivers, remapping of the legacy DPMS
887 	 * property is entirely handled in the DRM core.
888 	 *
889 	 * RETURNS:
890 	 *
891 	 * 0 on success or a negative error code on failure.
892 	 */
893 	int (*dpms)(struct drm_connector *connector, int mode);
894 
895 	/**
896 	 * @reset:
897 	 *
898 	 * Reset connector hardware and software state to off. This function isn't
899 	 * called by the core directly, only through drm_mode_config_reset().
900 	 * It's not a helper hook only for historical reasons.
901 	 *
902 	 * Atomic drivers can use drm_atomic_helper_connector_reset() to reset
903 	 * atomic state using this hook.
904 	 */
905 	void (*reset)(struct drm_connector *connector);
906 
907 	/**
908 	 * @detect:
909 	 *
910 	 * Check to see if anything is attached to the connector. The parameter
911 	 * force is set to false whilst polling, true when checking the
912 	 * connector due to a user request. force can be used by the driver to
913 	 * avoid expensive, destructive operations during automated probing.
914 	 *
915 	 * This callback is optional, if not implemented the connector will be
916 	 * considered as always being attached.
917 	 *
918 	 * FIXME:
919 	 *
920 	 * Note that this hook is only called by the probe helper. It's not in
921 	 * the helper library vtable purely for historical reasons. The only DRM
922 	 * core	entry point to probe connector state is @fill_modes.
923 	 *
924 	 * Note that the helper library will already hold
925 	 * &drm_mode_config.connection_mutex. Drivers which need to grab additional
926 	 * locks to avoid races with concurrent modeset changes need to use
927 	 * &drm_connector_helper_funcs.detect_ctx instead.
928 	 *
929 	 * Also note that this callback can be called no matter the
930 	 * state the connector is in. Drivers that need the underlying
931 	 * device to be powered to perform the detection will first need
932 	 * to make sure it's been properly enabled.
933 	 *
934 	 * RETURNS:
935 	 *
936 	 * drm_connector_status indicating the connector's status.
937 	 */
938 	enum drm_connector_status (*detect)(struct drm_connector *connector,
939 					    bool force);
940 
941 	/**
942 	 * @force:
943 	 *
944 	 * This function is called to update internal encoder state when the
945 	 * connector is forced to a certain state by userspace, either through
946 	 * the sysfs interfaces or on the kernel cmdline. In that case the
947 	 * @detect callback isn't called.
948 	 *
949 	 * FIXME:
950 	 *
951 	 * Note that this hook is only called by the probe helper. It's not in
952 	 * the helper library vtable purely for historical reasons. The only DRM
953 	 * core	entry point to probe connector state is @fill_modes.
954 	 */
955 	void (*force)(struct drm_connector *connector);
956 
957 	/**
958 	 * @fill_modes:
959 	 *
960 	 * Entry point for output detection and basic mode validation. The
961 	 * driver should reprobe the output if needed (e.g. when hotplug
962 	 * handling is unreliable), add all detected modes to &drm_connector.modes
963 	 * and filter out any the device can't support in any configuration. It
964 	 * also needs to filter out any modes wider or higher than the
965 	 * parameters max_width and max_height indicate.
966 	 *
967 	 * The drivers must also prune any modes no longer valid from
968 	 * &drm_connector.modes. Furthermore it must update
969 	 * &drm_connector.status and &drm_connector.edid.  If no EDID has been
970 	 * received for this output connector->edid must be NULL.
971 	 *
972 	 * Drivers using the probe helpers should use
973 	 * drm_helper_probe_single_connector_modes() to implement this
974 	 * function.
975 	 *
976 	 * RETURNS:
977 	 *
978 	 * The number of modes detected and filled into &drm_connector.modes.
979 	 */
980 	int (*fill_modes)(struct drm_connector *connector, uint32_t max_width, uint32_t max_height);
981 
982 	/**
983 	 * @set_property:
984 	 *
985 	 * This is the legacy entry point to update a property attached to the
986 	 * connector.
987 	 *
988 	 * This callback is optional if the driver does not support any legacy
989 	 * driver-private properties. For atomic drivers it is not used because
990 	 * property handling is done entirely in the DRM core.
991 	 *
992 	 * RETURNS:
993 	 *
994 	 * 0 on success or a negative error code on failure.
995 	 */
996 	int (*set_property)(struct drm_connector *connector, struct drm_property *property,
997 			     uint64_t val);
998 
999 	/**
1000 	 * @late_register:
1001 	 *
1002 	 * This optional hook can be used to register additional userspace
1003 	 * interfaces attached to the connector, light backlight control, i2c,
1004 	 * DP aux or similar interfaces. It is called late in the driver load
1005 	 * sequence from drm_connector_register() when registering all the
1006 	 * core drm connector interfaces. Everything added from this callback
1007 	 * should be unregistered in the early_unregister callback.
1008 	 *
1009 	 * This is called while holding &drm_connector.mutex.
1010 	 *
1011 	 * Returns:
1012 	 *
1013 	 * 0 on success, or a negative error code on failure.
1014 	 */
1015 	int (*late_register)(struct drm_connector *connector);
1016 
1017 	/**
1018 	 * @early_unregister:
1019 	 *
1020 	 * This optional hook should be used to unregister the additional
1021 	 * userspace interfaces attached to the connector from
1022 	 * late_register(). It is called from drm_connector_unregister(),
1023 	 * early in the driver unload sequence to disable userspace access
1024 	 * before data structures are torndown.
1025 	 *
1026 	 * This is called while holding &drm_connector.mutex.
1027 	 */
1028 	void (*early_unregister)(struct drm_connector *connector);
1029 
1030 	/**
1031 	 * @destroy:
1032 	 *
1033 	 * Clean up connector resources. This is called at driver unload time
1034 	 * through drm_mode_config_cleanup(). It can also be called at runtime
1035 	 * when a connector is being hot-unplugged for drivers that support
1036 	 * connector hotplugging (e.g. DisplayPort MST).
1037 	 */
1038 	void (*destroy)(struct drm_connector *connector);
1039 
1040 	/**
1041 	 * @atomic_duplicate_state:
1042 	 *
1043 	 * Duplicate the current atomic state for this connector and return it.
1044 	 * The core and helpers guarantee that any atomic state duplicated with
1045 	 * this hook and still owned by the caller (i.e. not transferred to the
1046 	 * driver by calling &drm_mode_config_funcs.atomic_commit) will be
1047 	 * cleaned up by calling the @atomic_destroy_state hook in this
1048 	 * structure.
1049 	 *
1050 	 * This callback is mandatory for atomic drivers.
1051 	 *
1052 	 * Atomic drivers which don't subclass &struct drm_connector_state should use
1053 	 * drm_atomic_helper_connector_duplicate_state(). Drivers that subclass the
1054 	 * state structure to extend it with driver-private state should use
1055 	 * __drm_atomic_helper_connector_duplicate_state() to make sure shared state is
1056 	 * duplicated in a consistent fashion across drivers.
1057 	 *
1058 	 * It is an error to call this hook before &drm_connector.state has been
1059 	 * initialized correctly.
1060 	 *
1061 	 * NOTE:
1062 	 *
1063 	 * If the duplicate state references refcounted resources this hook must
1064 	 * acquire a reference for each of them. The driver must release these
1065 	 * references again in @atomic_destroy_state.
1066 	 *
1067 	 * RETURNS:
1068 	 *
1069 	 * Duplicated atomic state or NULL when the allocation failed.
1070 	 */
1071 	struct drm_connector_state *(*atomic_duplicate_state)(struct drm_connector *connector);
1072 
1073 	/**
1074 	 * @atomic_destroy_state:
1075 	 *
1076 	 * Destroy a state duplicated with @atomic_duplicate_state and release
1077 	 * or unreference all resources it references
1078 	 *
1079 	 * This callback is mandatory for atomic drivers.
1080 	 */
1081 	void (*atomic_destroy_state)(struct drm_connector *connector,
1082 				     struct drm_connector_state *state);
1083 
1084 	/**
1085 	 * @atomic_set_property:
1086 	 *
1087 	 * Decode a driver-private property value and store the decoded value
1088 	 * into the passed-in state structure. Since the atomic core decodes all
1089 	 * standardized properties (even for extensions beyond the core set of
1090 	 * properties which might not be implemented by all drivers) this
1091 	 * requires drivers to subclass the state structure.
1092 	 *
1093 	 * Such driver-private properties should really only be implemented for
1094 	 * truly hardware/vendor specific state. Instead it is preferred to
1095 	 * standardize atomic extension and decode the properties used to expose
1096 	 * such an extension in the core.
1097 	 *
1098 	 * Do not call this function directly, use
1099 	 * drm_atomic_connector_set_property() instead.
1100 	 *
1101 	 * This callback is optional if the driver does not support any
1102 	 * driver-private atomic properties.
1103 	 *
1104 	 * NOTE:
1105 	 *
1106 	 * This function is called in the state assembly phase of atomic
1107 	 * modesets, which can be aborted for any reason (including on
1108 	 * userspace's request to just check whether a configuration would be
1109 	 * possible). Drivers MUST NOT touch any persistent state (hardware or
1110 	 * software) or data structures except the passed in @state parameter.
1111 	 *
1112 	 * Also since userspace controls in which order properties are set this
1113 	 * function must not do any input validation (since the state update is
1114 	 * incomplete and hence likely inconsistent). Instead any such input
1115 	 * validation must be done in the various atomic_check callbacks.
1116 	 *
1117 	 * RETURNS:
1118 	 *
1119 	 * 0 if the property has been found, -EINVAL if the property isn't
1120 	 * implemented by the driver (which shouldn't ever happen, the core only
1121 	 * asks for properties attached to this connector). No other validation
1122 	 * is allowed by the driver. The core already checks that the property
1123 	 * value is within the range (integer, valid enum value, ...) the driver
1124 	 * set when registering the property.
1125 	 */
1126 	int (*atomic_set_property)(struct drm_connector *connector,
1127 				   struct drm_connector_state *state,
1128 				   struct drm_property *property,
1129 				   uint64_t val);
1130 
1131 	/**
1132 	 * @atomic_get_property:
1133 	 *
1134 	 * Reads out the decoded driver-private property. This is used to
1135 	 * implement the GETCONNECTOR IOCTL.
1136 	 *
1137 	 * Do not call this function directly, use
1138 	 * drm_atomic_connector_get_property() instead.
1139 	 *
1140 	 * This callback is optional if the driver does not support any
1141 	 * driver-private atomic properties.
1142 	 *
1143 	 * RETURNS:
1144 	 *
1145 	 * 0 on success, -EINVAL if the property isn't implemented by the
1146 	 * driver (which shouldn't ever happen, the core only asks for
1147 	 * properties attached to this connector).
1148 	 */
1149 	int (*atomic_get_property)(struct drm_connector *connector,
1150 				   const struct drm_connector_state *state,
1151 				   struct drm_property *property,
1152 				   uint64_t *val);
1153 
1154 	/**
1155 	 * @atomic_print_state:
1156 	 *
1157 	 * If driver subclasses &struct drm_connector_state, it should implement
1158 	 * this optional hook for printing additional driver specific state.
1159 	 *
1160 	 * Do not call this directly, use drm_atomic_connector_print_state()
1161 	 * instead.
1162 	 */
1163 	void (*atomic_print_state)(struct drm_printer *p,
1164 				   const struct drm_connector_state *state);
1165 
1166 	/**
1167 	 * @oob_hotplug_event:
1168 	 *
1169 	 * This will get called when a hotplug-event for a drm-connector
1170 	 * has been received from a source outside the display driver / device.
1171 	 */
1172 	void (*oob_hotplug_event)(struct drm_connector *connector);
1173 
1174 	/**
1175 	 * @debugfs_init:
1176 	 *
1177 	 * Allows connectors to create connector-specific debugfs files.
1178 	 */
1179 	void (*debugfs_init)(struct drm_connector *connector, struct dentry *root);
1180 };
1181 
1182 /**
1183  * struct drm_cmdline_mode - DRM Mode passed through the kernel command-line
1184  *
1185  * Each connector can have an initial mode with additional options
1186  * passed through the kernel command line. This structure allows to
1187  * express those parameters and will be filled by the command-line
1188  * parser.
1189  */
1190 struct drm_cmdline_mode {
1191 	/**
1192 	 * @name:
1193 	 *
1194 	 * Name of the mode.
1195 	 */
1196 	char name[DRM_DISPLAY_MODE_LEN];
1197 
1198 	/**
1199 	 * @specified:
1200 	 *
1201 	 * Has a mode been read from the command-line?
1202 	 */
1203 	bool specified;
1204 
1205 	/**
1206 	 * @refresh_specified:
1207 	 *
1208 	 * Did the mode have a preferred refresh rate?
1209 	 */
1210 	bool refresh_specified;
1211 
1212 	/**
1213 	 * @bpp_specified:
1214 	 *
1215 	 * Did the mode have a preferred BPP?
1216 	 */
1217 	bool bpp_specified;
1218 
1219 	/**
1220 	 * @xres:
1221 	 *
1222 	 * Active resolution on the X axis, in pixels.
1223 	 */
1224 	int xres;
1225 
1226 	/**
1227 	 * @yres:
1228 	 *
1229 	 * Active resolution on the Y axis, in pixels.
1230 	 */
1231 	int yres;
1232 
1233 	/**
1234 	 * @bpp:
1235 	 *
1236 	 * Bits per pixels for the mode.
1237 	 */
1238 	int bpp;
1239 
1240 	/**
1241 	 * @refresh:
1242 	 *
1243 	 * Refresh rate, in Hertz.
1244 	 */
1245 	int refresh;
1246 
1247 	/**
1248 	 * @rb:
1249 	 *
1250 	 * Do we need to use reduced blanking?
1251 	 */
1252 	bool rb;
1253 
1254 	/**
1255 	 * @interlace:
1256 	 *
1257 	 * The mode is interlaced.
1258 	 */
1259 	bool interlace;
1260 
1261 	/**
1262 	 * @cvt:
1263 	 *
1264 	 * The timings will be calculated using the VESA Coordinated
1265 	 * Video Timings instead of looking up the mode from a table.
1266 	 */
1267 	bool cvt;
1268 
1269 	/**
1270 	 * @margins:
1271 	 *
1272 	 * Add margins to the mode calculation (1.8% of xres rounded
1273 	 * down to 8 pixels and 1.8% of yres).
1274 	 */
1275 	bool margins;
1276 
1277 	/**
1278 	 * @force:
1279 	 *
1280 	 * Ignore the hotplug state of the connector, and force its
1281 	 * state to one of the DRM_FORCE_* values.
1282 	 */
1283 	enum drm_connector_force force;
1284 
1285 	/**
1286 	 * @rotation_reflection:
1287 	 *
1288 	 * Initial rotation and reflection of the mode setup from the
1289 	 * command line. See DRM_MODE_ROTATE_* and
1290 	 * DRM_MODE_REFLECT_*. The only rotations supported are
1291 	 * DRM_MODE_ROTATE_0 and DRM_MODE_ROTATE_180.
1292 	 */
1293 	unsigned int rotation_reflection;
1294 
1295 	/**
1296 	 * @panel_orientation:
1297 	 *
1298 	 * drm-connector "panel orientation" property override value,
1299 	 * DRM_MODE_PANEL_ORIENTATION_UNKNOWN if not set.
1300 	 */
1301 	enum drm_panel_orientation panel_orientation;
1302 
1303 	/**
1304 	 * @tv_margins: TV margins to apply to the mode.
1305 	 */
1306 	struct drm_connector_tv_margins tv_margins;
1307 };
1308 
1309 /**
1310  * struct drm_connector - central DRM connector control structure
1311  *
1312  * Each connector may be connected to one or more CRTCs, or may be clonable by
1313  * another connector if they can share a CRTC.  Each connector also has a specific
1314  * position in the broader display (referred to as a 'screen' though it could
1315  * span multiple monitors).
1316  */
1317 struct drm_connector {
1318 	/** @dev: parent DRM device */
1319 	struct drm_device *dev;
1320 	/** @kdev: kernel device for sysfs attributes */
1321 	struct device *kdev;
1322 	/** @attr: sysfs attributes */
1323 	struct device_attribute *attr;
1324 	/**
1325 	 * @fwnode: associated fwnode supplied by platform firmware
1326 	 *
1327 	 * Drivers can set this to associate a fwnode with a connector, drivers
1328 	 * are expected to get a reference on the fwnode when setting this.
1329 	 * drm_connector_cleanup() will call fwnode_handle_put() on this.
1330 	 */
1331 	struct fwnode_handle *fwnode;
1332 
1333 	/**
1334 	 * @head:
1335 	 *
1336 	 * List of all connectors on a @dev, linked from
1337 	 * &drm_mode_config.connector_list. Protected by
1338 	 * &drm_mode_config.connector_list_lock, but please only use
1339 	 * &drm_connector_list_iter to walk this list.
1340 	 */
1341 	struct list_head head;
1342 
1343 	/**
1344 	 * @global_connector_list_entry:
1345 	 *
1346 	 * Connector entry in the global connector-list, used by
1347 	 * drm_connector_find_by_fwnode().
1348 	 */
1349 	struct list_head global_connector_list_entry;
1350 
1351 	/** @base: base KMS object */
1352 	struct drm_mode_object base;
1353 
1354 	/** @name: human readable name, can be overwritten by the driver */
1355 	char *name;
1356 
1357 	/**
1358 	 * @mutex: Lock for general connector state, but currently only protects
1359 	 * @registered. Most of the connector state is still protected by
1360 	 * &drm_mode_config.mutex.
1361 	 */
1362 	struct mutex mutex;
1363 
1364 	/**
1365 	 * @index: Compacted connector index, which matches the position inside
1366 	 * the mode_config.list for drivers not supporting hot-add/removing. Can
1367 	 * be used as an array index. It is invariant over the lifetime of the
1368 	 * connector.
1369 	 */
1370 	unsigned index;
1371 
1372 	/**
1373 	 * @connector_type:
1374 	 * one of the DRM_MODE_CONNECTOR_<foo> types from drm_mode.h
1375 	 */
1376 	int connector_type;
1377 	/** @connector_type_id: index into connector type enum */
1378 	int connector_type_id;
1379 	/**
1380 	 * @interlace_allowed:
1381 	 * Can this connector handle interlaced modes? Only used by
1382 	 * drm_helper_probe_single_connector_modes() for mode filtering.
1383 	 */
1384 	bool interlace_allowed;
1385 	/**
1386 	 * @doublescan_allowed:
1387 	 * Can this connector handle doublescan? Only used by
1388 	 * drm_helper_probe_single_connector_modes() for mode filtering.
1389 	 */
1390 	bool doublescan_allowed;
1391 	/**
1392 	 * @stereo_allowed:
1393 	 * Can this connector handle stereo modes? Only used by
1394 	 * drm_helper_probe_single_connector_modes() for mode filtering.
1395 	 */
1396 	bool stereo_allowed;
1397 
1398 	/**
1399 	 * @ycbcr_420_allowed : This bool indicates if this connector is
1400 	 * capable of handling YCBCR 420 output. While parsing the EDID
1401 	 * blocks it's very helpful to know if the source is capable of
1402 	 * handling YCBCR 420 outputs.
1403 	 */
1404 	bool ycbcr_420_allowed;
1405 
1406 	/**
1407 	 * @registration_state: Is this connector initializing, exposed
1408 	 * (registered) with userspace, or unregistered?
1409 	 *
1410 	 * Protected by @mutex.
1411 	 */
1412 	enum drm_connector_registration_state registration_state;
1413 
1414 	/**
1415 	 * @modes:
1416 	 * Modes available on this connector (from fill_modes() + user).
1417 	 * Protected by &drm_mode_config.mutex.
1418 	 */
1419 	struct list_head modes;
1420 
1421 	/**
1422 	 * @status:
1423 	 * One of the drm_connector_status enums (connected, not, or unknown).
1424 	 * Protected by &drm_mode_config.mutex.
1425 	 */
1426 	enum drm_connector_status status;
1427 
1428 	/**
1429 	 * @probed_modes:
1430 	 * These are modes added by probing with DDC or the BIOS, before
1431 	 * filtering is applied. Used by the probe helpers. Protected by
1432 	 * &drm_mode_config.mutex.
1433 	 */
1434 	struct list_head probed_modes;
1435 
1436 	/**
1437 	 * @display_info: Display information is filled from EDID information
1438 	 * when a display is detected. For non hot-pluggable displays such as
1439 	 * flat panels in embedded systems, the driver should initialize the
1440 	 * &drm_display_info.width_mm and &drm_display_info.height_mm fields
1441 	 * with the physical size of the display.
1442 	 *
1443 	 * Protected by &drm_mode_config.mutex.
1444 	 */
1445 	struct drm_display_info display_info;
1446 
1447 	/** @funcs: connector control functions */
1448 	const struct drm_connector_funcs *funcs;
1449 
1450 	/**
1451 	 * @edid_blob_ptr: DRM property containing EDID if present. Protected by
1452 	 * &drm_mode_config.mutex. This should be updated only by calling
1453 	 * drm_connector_update_edid_property().
1454 	 */
1455 	struct drm_property_blob *edid_blob_ptr;
1456 
1457 	/** @properties: property tracking for this connector */
1458 	struct drm_object_properties properties;
1459 
1460 	/**
1461 	 * @scaling_mode_property: Optional atomic property to control the
1462 	 * upscaling. See drm_connector_attach_content_protection_property().
1463 	 */
1464 	struct drm_property *scaling_mode_property;
1465 
1466 	/**
1467 	 * @vrr_capable_property: Optional property to help userspace
1468 	 * query hardware support for variable refresh rate on a connector.
1469 	 * connector. Drivers can add the property to a connector by
1470 	 * calling drm_connector_attach_vrr_capable_property().
1471 	 *
1472 	 * This should be updated only by calling
1473 	 * drm_connector_set_vrr_capable_property().
1474 	 */
1475 	struct drm_property *vrr_capable_property;
1476 
1477 	/**
1478 	 * @colorspace_property: Connector property to set the suitable
1479 	 * colorspace supported by the sink.
1480 	 */
1481 	struct drm_property *colorspace_property;
1482 
1483 	/**
1484 	 * @path_blob_ptr:
1485 	 *
1486 	 * DRM blob property data for the DP MST path property. This should only
1487 	 * be updated by calling drm_connector_set_path_property().
1488 	 */
1489 	struct drm_property_blob *path_blob_ptr;
1490 
1491 	/**
1492 	 * @max_bpc_property: Default connector property for the max bpc to be
1493 	 * driven out of the connector.
1494 	 */
1495 	struct drm_property *max_bpc_property;
1496 
1497 	/** @privacy_screen: drm_privacy_screen for this connector, or NULL. */
1498 	struct drm_privacy_screen *privacy_screen;
1499 
1500 	/** @privacy_screen_notifier: privacy-screen notifier_block */
1501 	struct notifier_block privacy_screen_notifier;
1502 
1503 	/**
1504 	 * @privacy_screen_sw_state_property: Optional atomic property for the
1505 	 * connector to control the integrated privacy screen.
1506 	 */
1507 	struct drm_property *privacy_screen_sw_state_property;
1508 
1509 	/**
1510 	 * @privacy_screen_hw_state_property: Optional atomic property for the
1511 	 * connector to report the actual integrated privacy screen state.
1512 	 */
1513 	struct drm_property *privacy_screen_hw_state_property;
1514 
1515 #define DRM_CONNECTOR_POLL_HPD (1 << 0)
1516 #define DRM_CONNECTOR_POLL_CONNECT (1 << 1)
1517 #define DRM_CONNECTOR_POLL_DISCONNECT (1 << 2)
1518 
1519 	/**
1520 	 * @polled:
1521 	 *
1522 	 * Connector polling mode, a combination of
1523 	 *
1524 	 * DRM_CONNECTOR_POLL_HPD
1525 	 *     The connector generates hotplug events and doesn't need to be
1526 	 *     periodically polled. The CONNECT and DISCONNECT flags must not
1527 	 *     be set together with the HPD flag.
1528 	 *
1529 	 * DRM_CONNECTOR_POLL_CONNECT
1530 	 *     Periodically poll the connector for connection.
1531 	 *
1532 	 * DRM_CONNECTOR_POLL_DISCONNECT
1533 	 *     Periodically poll the connector for disconnection, without
1534 	 *     causing flickering even when the connector is in use. DACs should
1535 	 *     rarely do this without a lot of testing.
1536 	 *
1537 	 * Set to 0 for connectors that don't support connection status
1538 	 * discovery.
1539 	 */
1540 	uint8_t polled;
1541 
1542 	/**
1543 	 * @dpms: Current dpms state. For legacy drivers the
1544 	 * &drm_connector_funcs.dpms callback must update this. For atomic
1545 	 * drivers, this is handled by the core atomic code, and drivers must
1546 	 * only take &drm_crtc_state.active into account.
1547 	 */
1548 	int dpms;
1549 
1550 	/** @helper_private: mid-layer private data */
1551 	const struct drm_connector_helper_funcs *helper_private;
1552 
1553 	/** @cmdline_mode: mode line parsed from the kernel cmdline for this connector */
1554 	struct drm_cmdline_mode cmdline_mode;
1555 	/** @force: a DRM_FORCE_<foo> state for forced mode sets */
1556 	enum drm_connector_force force;
1557 	/**
1558 	 * @override_edid: has the EDID been overwritten through debugfs for
1559 	 * testing? Do not modify outside of drm_edid_override_set() and
1560 	 * drm_edid_override_reset().
1561 	 */
1562 	bool override_edid;
1563 	/** @epoch_counter: used to detect any other changes in connector, besides status */
1564 	u64 epoch_counter;
1565 
1566 	/**
1567 	 * @possible_encoders: Bit mask of encoders that can drive this
1568 	 * connector, drm_encoder_index() determines the index into the bitfield
1569 	 * and the bits are set with drm_connector_attach_encoder().
1570 	 */
1571 	u32 possible_encoders;
1572 
1573 	/**
1574 	 * @encoder: Currently bound encoder driving this connector, if any.
1575 	 * Only really meaningful for non-atomic drivers. Atomic drivers should
1576 	 * instead look at &drm_connector_state.best_encoder, and in case they
1577 	 * need the CRTC driving this output, &drm_connector_state.crtc.
1578 	 */
1579 	struct drm_encoder *encoder;
1580 
1581 #define MAX_ELD_BYTES	128
1582 	/** @eld: EDID-like data, if present */
1583 	uint8_t eld[MAX_ELD_BYTES];
1584 	/** @latency_present: AV delay info from ELD, if found */
1585 	bool latency_present[2];
1586 	/**
1587 	 * @video_latency: Video latency info from ELD, if found.
1588 	 * [0]: progressive, [1]: interlaced
1589 	 */
1590 	int video_latency[2];
1591 	/**
1592 	 * @audio_latency: audio latency info from ELD, if found
1593 	 * [0]: progressive, [1]: interlaced
1594 	 */
1595 	int audio_latency[2];
1596 
1597 	/**
1598 	 * @ddc: associated ddc adapter.
1599 	 * A connector usually has its associated ddc adapter. If a driver uses
1600 	 * this field, then an appropriate symbolic link is created in connector
1601 	 * sysfs directory to make it easy for the user to tell which i2c
1602 	 * adapter is for a particular display.
1603 	 *
1604 	 * The field should be set by calling drm_connector_init_with_ddc().
1605 	 */
1606 	struct i2c_adapter *ddc;
1607 
1608 	/**
1609 	 * @null_edid_counter: track sinks that give us all zeros for the EDID.
1610 	 * Needed to workaround some HW bugs where we get all 0s
1611 	 */
1612 	int null_edid_counter;
1613 
1614 	/** @bad_edid_counter: track sinks that give us an EDID with invalid checksum */
1615 	unsigned bad_edid_counter;
1616 
1617 	/**
1618 	 * @edid_corrupt: Indicates whether the last read EDID was corrupt. Used
1619 	 * in Displayport compliance testing - Displayport Link CTS Core 1.2
1620 	 * rev1.1 4.2.2.6
1621 	 */
1622 	bool edid_corrupt;
1623 	/**
1624 	 * @real_edid_checksum: real edid checksum for corrupted edid block.
1625 	 * Required in Displayport 1.4 compliance testing
1626 	 * rev1.1 4.2.2.6
1627 	 */
1628 	u8 real_edid_checksum;
1629 
1630 	/** @debugfs_entry: debugfs directory for this connector */
1631 	struct dentry *debugfs_entry;
1632 
1633 	/**
1634 	 * @state:
1635 	 *
1636 	 * Current atomic state for this connector.
1637 	 *
1638 	 * This is protected by &drm_mode_config.connection_mutex. Note that
1639 	 * nonblocking atomic commits access the current connector state without
1640 	 * taking locks. Either by going through the &struct drm_atomic_state
1641 	 * pointers, see for_each_oldnew_connector_in_state(),
1642 	 * for_each_old_connector_in_state() and
1643 	 * for_each_new_connector_in_state(). Or through careful ordering of
1644 	 * atomic commit operations as implemented in the atomic helpers, see
1645 	 * &struct drm_crtc_commit.
1646 	 */
1647 	struct drm_connector_state *state;
1648 
1649 	/* DisplayID bits. FIXME: Extract into a substruct? */
1650 
1651 	/**
1652 	 * @tile_blob_ptr:
1653 	 *
1654 	 * DRM blob property data for the tile property (used mostly by DP MST).
1655 	 * This is meant for screens which are driven through separate display
1656 	 * pipelines represented by &drm_crtc, which might not be running with
1657 	 * genlocked clocks. For tiled panels which are genlocked, like
1658 	 * dual-link LVDS or dual-link DSI, the driver should try to not expose
1659 	 * the tiling and virtualize both &drm_crtc and &drm_plane if needed.
1660 	 *
1661 	 * This should only be updated by calling
1662 	 * drm_connector_set_tile_property().
1663 	 */
1664 	struct drm_property_blob *tile_blob_ptr;
1665 
1666 	/** @has_tile: is this connector connected to a tiled monitor */
1667 	bool has_tile;
1668 	/** @tile_group: tile group for the connected monitor */
1669 	struct drm_tile_group *tile_group;
1670 	/** @tile_is_single_monitor: whether the tile is one monitor housing */
1671 	bool tile_is_single_monitor;
1672 
1673 	/** @num_h_tile: number of horizontal tiles in the tile group */
1674 	/** @num_v_tile: number of vertical tiles in the tile group */
1675 	uint8_t num_h_tile, num_v_tile;
1676 	/** @tile_h_loc: horizontal location of this tile */
1677 	/** @tile_v_loc: vertical location of this tile */
1678 	uint8_t tile_h_loc, tile_v_loc;
1679 	/** @tile_h_size: horizontal size of this tile. */
1680 	/** @tile_v_size: vertical size of this tile. */
1681 	uint16_t tile_h_size, tile_v_size;
1682 
1683 	/**
1684 	 * @free_node:
1685 	 *
1686 	 * List used only by &drm_connector_list_iter to be able to clean up a
1687 	 * connector from any context, in conjunction with
1688 	 * &drm_mode_config.connector_free_work.
1689 	 */
1690 	struct llist_node free_node;
1691 
1692 	/** @hdr_sink_metadata: HDR Metadata Information read from sink */
1693 	struct hdr_sink_metadata hdr_sink_metadata;
1694 };
1695 
1696 #define obj_to_connector(x) container_of(x, struct drm_connector, base)
1697 
1698 int drm_connector_init(struct drm_device *dev,
1699 		       struct drm_connector *connector,
1700 		       const struct drm_connector_funcs *funcs,
1701 		       int connector_type);
1702 int drm_connector_init_with_ddc(struct drm_device *dev,
1703 				struct drm_connector *connector,
1704 				const struct drm_connector_funcs *funcs,
1705 				int connector_type,
1706 				struct i2c_adapter *ddc);
1707 int drmm_connector_init(struct drm_device *dev,
1708 			struct drm_connector *connector,
1709 			const struct drm_connector_funcs *funcs,
1710 			int connector_type,
1711 			struct i2c_adapter *ddc);
1712 void drm_connector_attach_edid_property(struct drm_connector *connector);
1713 int drm_connector_register(struct drm_connector *connector);
1714 void drm_connector_unregister(struct drm_connector *connector);
1715 int drm_connector_attach_encoder(struct drm_connector *connector,
1716 				      struct drm_encoder *encoder);
1717 
1718 void drm_connector_cleanup(struct drm_connector *connector);
1719 
drm_connector_index(const struct drm_connector * connector)1720 static inline unsigned int drm_connector_index(const struct drm_connector *connector)
1721 {
1722 	return connector->index;
1723 }
1724 
drm_connector_mask(const struct drm_connector * connector)1725 static inline u32 drm_connector_mask(const struct drm_connector *connector)
1726 {
1727 	return 1 << connector->index;
1728 }
1729 
1730 /**
1731  * drm_connector_lookup - lookup connector object
1732  * @dev: DRM device
1733  * @file_priv: drm file to check for lease against.
1734  * @id: connector object id
1735  *
1736  * This function looks up the connector object specified by id
1737  * add takes a reference to it.
1738  */
drm_connector_lookup(struct drm_device * dev,struct drm_file * file_priv,uint32_t id)1739 static inline struct drm_connector *drm_connector_lookup(struct drm_device *dev,
1740 		struct drm_file *file_priv,
1741 		uint32_t id)
1742 {
1743 	struct drm_mode_object *mo;
1744 	mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_CONNECTOR);
1745 	return mo ? obj_to_connector(mo) : NULL;
1746 }
1747 
1748 /**
1749  * drm_connector_get - acquire a connector reference
1750  * @connector: DRM connector
1751  *
1752  * This function increments the connector's refcount.
1753  */
drm_connector_get(struct drm_connector * connector)1754 static inline void drm_connector_get(struct drm_connector *connector)
1755 {
1756 	drm_mode_object_get(&connector->base);
1757 }
1758 
1759 /**
1760  * drm_connector_put - release a connector reference
1761  * @connector: DRM connector
1762  *
1763  * This function decrements the connector's reference count and frees the
1764  * object if the reference count drops to zero.
1765  */
drm_connector_put(struct drm_connector * connector)1766 static inline void drm_connector_put(struct drm_connector *connector)
1767 {
1768 	drm_mode_object_put(&connector->base);
1769 }
1770 
1771 /**
1772  * drm_connector_is_unregistered - has the connector been unregistered from
1773  * userspace?
1774  * @connector: DRM connector
1775  *
1776  * Checks whether or not @connector has been unregistered from userspace.
1777  *
1778  * Returns:
1779  * True if the connector was unregistered, false if the connector is
1780  * registered or has not yet been registered with userspace.
1781  */
1782 static inline bool
drm_connector_is_unregistered(struct drm_connector * connector)1783 drm_connector_is_unregistered(struct drm_connector *connector)
1784 {
1785 	return READ_ONCE(connector->registration_state) ==
1786 		DRM_CONNECTOR_UNREGISTERED;
1787 }
1788 
1789 void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode);
1790 const char *drm_get_connector_type_name(unsigned int connector_type);
1791 const char *drm_get_connector_status_name(enum drm_connector_status status);
1792 const char *drm_get_subpixel_order_name(enum subpixel_order order);
1793 const char *drm_get_dpms_name(int val);
1794 const char *drm_get_dvi_i_subconnector_name(int val);
1795 const char *drm_get_dvi_i_select_name(int val);
1796 const char *drm_get_tv_subconnector_name(int val);
1797 const char *drm_get_tv_select_name(int val);
1798 const char *drm_get_dp_subconnector_name(int val);
1799 const char *drm_get_content_protection_name(int val);
1800 const char *drm_get_hdcp_content_type_name(int val);
1801 
1802 int drm_mode_create_dvi_i_properties(struct drm_device *dev);
1803 void drm_connector_attach_dp_subconnector_property(struct drm_connector *connector);
1804 
1805 int drm_mode_create_tv_margin_properties(struct drm_device *dev);
1806 int drm_mode_create_tv_properties(struct drm_device *dev,
1807 				  unsigned int num_modes,
1808 				  const char * const modes[]);
1809 void drm_connector_attach_tv_margin_properties(struct drm_connector *conn);
1810 int drm_mode_create_scaling_mode_property(struct drm_device *dev);
1811 int drm_connector_attach_content_type_property(struct drm_connector *dev);
1812 int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
1813 					       u32 scaling_mode_mask);
1814 int drm_connector_attach_vrr_capable_property(
1815 		struct drm_connector *connector);
1816 int drm_connector_attach_colorspace_property(struct drm_connector *connector);
1817 int drm_connector_attach_hdr_output_metadata_property(struct drm_connector *connector);
1818 bool drm_connector_atomic_hdr_metadata_equal(struct drm_connector_state *old_state,
1819 					     struct drm_connector_state *new_state);
1820 int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
1821 int drm_mode_create_hdmi_colorspace_property(struct drm_connector *connector);
1822 int drm_mode_create_dp_colorspace_property(struct drm_connector *connector);
1823 int drm_mode_create_content_type_property(struct drm_device *dev);
1824 int drm_mode_create_suggested_offset_properties(struct drm_device *dev);
1825 
1826 int drm_connector_set_path_property(struct drm_connector *connector,
1827 				    const char *path);
1828 int drm_connector_set_tile_property(struct drm_connector *connector);
1829 int drm_connector_update_edid_property(struct drm_connector *connector,
1830 				       const struct edid *edid);
1831 void drm_connector_set_link_status_property(struct drm_connector *connector,
1832 					    uint64_t link_status);
1833 void drm_connector_set_vrr_capable_property(
1834 		struct drm_connector *connector, bool capable);
1835 int drm_connector_set_panel_orientation(
1836 	struct drm_connector *connector,
1837 	enum drm_panel_orientation panel_orientation);
1838 int drm_connector_set_panel_orientation_with_quirk(
1839 	struct drm_connector *connector,
1840 	enum drm_panel_orientation panel_orientation,
1841 	int width, int height);
1842 int drm_connector_set_orientation_from_panel(
1843 	struct drm_connector *connector,
1844 	struct drm_panel *panel);
1845 int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
1846 					  int min, int max);
1847 void drm_connector_create_privacy_screen_properties(struct drm_connector *conn);
1848 void drm_connector_attach_privacy_screen_properties(struct drm_connector *conn);
1849 void drm_connector_attach_privacy_screen_provider(
1850 	struct drm_connector *connector, struct drm_privacy_screen *priv);
1851 void drm_connector_update_privacy_screen(const struct drm_connector_state *connector_state);
1852 
1853 /**
1854  * struct drm_tile_group - Tile group metadata
1855  * @refcount: reference count
1856  * @dev: DRM device
1857  * @id: tile group id exposed to userspace
1858  * @group_data: Sink-private data identifying this group
1859  *
1860  * @group_data corresponds to displayid vend/prod/serial for external screens
1861  * with an EDID.
1862  */
1863 struct drm_tile_group {
1864 	struct kref refcount;
1865 	struct drm_device *dev;
1866 	int id;
1867 	u8 group_data[8];
1868 };
1869 
1870 struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
1871 						  const char topology[8]);
1872 struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
1873 					       const char topology[8]);
1874 void drm_mode_put_tile_group(struct drm_device *dev,
1875 			     struct drm_tile_group *tg);
1876 
1877 /**
1878  * struct drm_connector_list_iter - connector_list iterator
1879  *
1880  * This iterator tracks state needed to be able to walk the connector_list
1881  * within struct drm_mode_config. Only use together with
1882  * drm_connector_list_iter_begin(), drm_connector_list_iter_end() and
1883  * drm_connector_list_iter_next() respectively the convenience macro
1884  * drm_for_each_connector_iter().
1885  *
1886  * Note that the return value of drm_connector_list_iter_next() is only valid
1887  * up to the next drm_connector_list_iter_next() or
1888  * drm_connector_list_iter_end() call. If you want to use the connector later,
1889  * then you need to grab your own reference first using drm_connector_get().
1890  */
1891 struct drm_connector_list_iter {
1892 /* private: */
1893 	struct drm_device *dev;
1894 	struct drm_connector *conn;
1895 };
1896 
1897 void drm_connector_list_iter_begin(struct drm_device *dev,
1898 				   struct drm_connector_list_iter *iter);
1899 struct drm_connector *
1900 drm_connector_list_iter_next(struct drm_connector_list_iter *iter);
1901 void drm_connector_list_iter_end(struct drm_connector_list_iter *iter);
1902 
1903 bool drm_connector_has_possible_encoder(struct drm_connector *connector,
1904 					struct drm_encoder *encoder);
1905 
1906 /**
1907  * drm_for_each_connector_iter - connector_list iterator macro
1908  * @connector: &struct drm_connector pointer used as cursor
1909  * @iter: &struct drm_connector_list_iter
1910  *
1911  * Note that @connector is only valid within the list body, if you want to use
1912  * @connector after calling drm_connector_list_iter_end() then you need to grab
1913  * your own reference first using drm_connector_get().
1914  */
1915 #define drm_for_each_connector_iter(connector, iter) \
1916 	while ((connector = drm_connector_list_iter_next(iter)))
1917 
1918 /**
1919  * drm_connector_for_each_possible_encoder - iterate connector's possible encoders
1920  * @connector: &struct drm_connector pointer
1921  * @encoder: &struct drm_encoder pointer used as cursor
1922  */
1923 #define drm_connector_for_each_possible_encoder(connector, encoder) \
1924 	drm_for_each_encoder_mask(encoder, (connector)->dev, \
1925 				  (connector)->possible_encoders)
1926 
1927 #endif
1928