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TOMOYO Linux Cross Reference
Linux/include/drm/drm_connector.h

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  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 <drm/drm_mode_object.h>
 31 #include <drm/drm_util.h>
 32 
 33 #include <uapi/drm/drm_mode.h>
 34 
 35 struct drm_connector_helper_funcs;
 36 struct drm_modeset_acquire_ctx;
 37 struct drm_device;
 38 struct drm_crtc;
 39 struct drm_encoder;
 40 struct drm_property;
 41 struct drm_property_blob;
 42 struct drm_printer;
 43 struct edid;
 44 
 45 enum drm_connector_force {
 46         DRM_FORCE_UNSPECIFIED,
 47         DRM_FORCE_OFF,
 48         DRM_FORCE_ON,         /* force on analog part normally */
 49         DRM_FORCE_ON_DIGITAL, /* for DVI-I use digital connector */
 50 };
 51 
 52 /**
 53  * enum drm_connector_status - status for a &drm_connector
 54  *
 55  * This enum is used to track the connector status. There are no separate
 56  * #defines for the uapi!
 57  */
 58 enum drm_connector_status {
 59         /**
 60          * @connector_status_connected: The connector is definitely connected to
 61          * a sink device, and can be enabled.
 62          */
 63         connector_status_connected = 1,
 64         /**
 65          * @connector_status_disconnected: The connector isn't connected to a
 66          * sink device which can be autodetect. For digital outputs like DP or
 67          * HDMI (which can be realiable probed) this means there's really
 68          * nothing there. It is driver-dependent whether a connector with this
 69          * status can be lit up or not.
 70          */
 71         connector_status_disconnected = 2,
 72         /**
 73          * @connector_status_unknown: The connector's status could not be
 74          * reliably detected. This happens when probing would either cause
 75          * flicker (like load-detection when the connector is in use), or when a
 76          * hardware resource isn't available (like when load-detection needs a
 77          * free CRTC). It should be possible to light up the connector with one
 78          * of the listed fallback modes. For default configuration userspace
 79          * should only try to light up connectors with unknown status when
 80          * there's not connector with @connector_status_connected.
 81          */
 82         connector_status_unknown = 3,
 83 };
 84 
 85 /**
 86  * enum drm_connector_registration_status - userspace registration status for
 87  * a &drm_connector
 88  *
 89  * This enum is used to track the status of initializing a connector and
 90  * registering it with userspace, so that DRM can prevent bogus modesets on
 91  * connectors that no longer exist.
 92  */
 93 enum drm_connector_registration_state {
 94         /**
 95          * @DRM_CONNECTOR_INITIALIZING: The connector has just been created,
 96          * but has yet to be exposed to userspace. There should be no
 97          * additional restrictions to how the state of this connector may be
 98          * modified.
 99          */
100         DRM_CONNECTOR_INITIALIZING = 0,
101 
102         /**
103          * @DRM_CONNECTOR_REGISTERED: The connector has been fully initialized
104          * and registered with sysfs, as such it has been exposed to
105          * userspace. There should be no additional restrictions to how the
106          * state of this connector may be modified.
107          */
108         DRM_CONNECTOR_REGISTERED = 1,
109 
110         /**
111          * @DRM_CONNECTOR_UNREGISTERED: The connector has either been exposed
112          * to userspace and has since been unregistered and removed from
113          * userspace, or the connector was unregistered before it had a chance
114          * to be exposed to userspace (e.g. still in the
115          * @DRM_CONNECTOR_INITIALIZING state). When a connector is
116          * unregistered, there are additional restrictions to how its state
117          * may be modified:
118          *
119          * - An unregistered connector may only have its DPMS changed from
120          *   On->Off. Once DPMS is changed to Off, it may not be switched back
121          *   to On.
122          * - Modesets are not allowed on unregistered connectors, unless they
123          *   would result in disabling its assigned CRTCs. This means
124          *   disabling a CRTC on an unregistered connector is OK, but enabling
125          *   one is not.
126          * - Removing a CRTC from an unregistered connector is OK, but new
127          *   CRTCs may never be assigned to an unregistered connector.
128          */
129         DRM_CONNECTOR_UNREGISTERED = 2,
130 };
131 
132 enum subpixel_order {
133         SubPixelUnknown = 0,
134         SubPixelHorizontalRGB,
135         SubPixelHorizontalBGR,
136         SubPixelVerticalRGB,
137         SubPixelVerticalBGR,
138         SubPixelNone,
139 
140 };
141 
142 /**
143  * struct drm_scrambling: sink's scrambling support.
144  */
145 struct drm_scrambling {
146         /**
147          * @supported: scrambling supported for rates > 340 Mhz.
148          */
149         bool supported;
150         /**
151          * @low_rates: scrambling supported for rates <= 340 Mhz.
152          */
153         bool low_rates;
154 };
155 
156 /*
157  * struct drm_scdc - Information about scdc capabilities of a HDMI 2.0 sink
158  *
159  * Provides SCDC register support and capabilities related information on a
160  * HDMI 2.0 sink. In case of a HDMI 1.4 sink, all parameter must be 0.
161  */
162 struct drm_scdc {
163         /**
164          * @supported: status control & data channel present.
165          */
166         bool supported;
167         /**
168          * @read_request: sink is capable of generating scdc read request.
169          */
170         bool read_request;
171         /**
172          * @scrambling: sink's scrambling capabilities
173          */
174         struct drm_scrambling scrambling;
175 };
176 
177 
178 /**
179  * struct drm_hdmi_info - runtime information about the connected HDMI sink
180  *
181  * Describes if a given display supports advanced HDMI 2.0 features.
182  * This information is available in CEA-861-F extension blocks (like HF-VSDB).
183  */
184 struct drm_hdmi_info {
185         /** @scdc: sink's scdc support and capabilities */
186         struct drm_scdc scdc;
187 
188         /**
189          * @y420_vdb_modes: bitmap of modes which can support ycbcr420
190          * output only (not normal RGB/YCBCR444/422 outputs). There are total
191          * 107 VICs defined by CEA-861-F spec, so the size is 128 bits to map
192          * upto 128 VICs;
193          */
194         unsigned long y420_vdb_modes[BITS_TO_LONGS(128)];
195 
196         /**
197          * @y420_cmdb_modes: bitmap of modes which can support ycbcr420
198          * output also, along with normal HDMI outputs. There are total 107
199          * VICs defined by CEA-861-F spec, so the size is 128 bits to map upto
200          * 128 VICs;
201          */
202         unsigned long y420_cmdb_modes[BITS_TO_LONGS(128)];
203 
204         /** @y420_cmdb_map: bitmap of SVD index, to extraxt vcb modes */
205         u64 y420_cmdb_map;
206 
207         /** @y420_dc_modes: bitmap of deep color support index */
208         u8 y420_dc_modes;
209 };
210 
211 /**
212  * enum drm_link_status - connector's link_status property value
213  *
214  * This enum is used as the connector's link status property value.
215  * It is set to the values defined in uapi.
216  *
217  * @DRM_LINK_STATUS_GOOD: DP Link is Good as a result of successful
218  *                        link training
219  * @DRM_LINK_STATUS_BAD: DP Link is BAD as a result of link training
220  *                       failure
221  */
222 enum drm_link_status {
223         DRM_LINK_STATUS_GOOD = DRM_MODE_LINK_STATUS_GOOD,
224         DRM_LINK_STATUS_BAD = DRM_MODE_LINK_STATUS_BAD,
225 };
226 
227 /**
228  * enum drm_panel_orientation - panel_orientation info for &drm_display_info
229  *
230  * This enum is used to track the (LCD) panel orientation. There are no
231  * separate #defines for the uapi!
232  *
233  * @DRM_MODE_PANEL_ORIENTATION_UNKNOWN: The drm driver has not provided any
234  *                                      panel orientation information (normal
235  *                                      for non panels) in this case the "panel
236  *                                      orientation" connector prop will not be
237  *                                      attached.
238  * @DRM_MODE_PANEL_ORIENTATION_NORMAL:  The top side of the panel matches the
239  *                                      top side of the device's casing.
240  * @DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP: The top side of the panel matches the
241  *                                      bottom side of the device's casing, iow
242  *                                      the panel is mounted upside-down.
243  * @DRM_MODE_PANEL_ORIENTATION_LEFT_UP: The left side of the panel matches the
244  *                                      top side of the device's casing.
245  * @DRM_MODE_PANEL_ORIENTATION_RIGHT_UP: The right side of the panel matches the
246  *                                      top side of the device's casing.
247  */
248 enum drm_panel_orientation {
249         DRM_MODE_PANEL_ORIENTATION_UNKNOWN = -1,
250         DRM_MODE_PANEL_ORIENTATION_NORMAL = 0,
251         DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP,
252         DRM_MODE_PANEL_ORIENTATION_LEFT_UP,
253         DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
254 };
255 
256 /**
257  * struct drm_display_info - runtime data about the connected sink
258  *
259  * Describes a given display (e.g. CRT or flat panel) and its limitations. For
260  * fixed display sinks like built-in panels there's not much difference between
261  * this and &struct drm_connector. But for sinks with a real cable this
262  * structure is meant to describe all the things at the other end of the cable.
263  *
264  * For sinks which provide an EDID this can be filled out by calling
265  * drm_add_edid_modes().
266  */
267 struct drm_display_info {
268         /**
269          * @name: Name of the display.
270          */
271         char name[DRM_DISPLAY_INFO_LEN];
272 
273         /**
274          * @width_mm: Physical width in mm.
275          */
276         unsigned int width_mm;
277         /**
278          * @height_mm: Physical height in mm.
279          */
280         unsigned int height_mm;
281 
282         /**
283          * @pixel_clock: Maximum pixel clock supported by the sink, in units of
284          * 100Hz. This mismatches the clock in &drm_display_mode (which is in
285          * kHZ), because that's what the EDID uses as base unit.
286          */
287         unsigned int pixel_clock;
288         /**
289          * @bpc: Maximum bits per color channel. Used by HDMI and DP outputs.
290          */
291         unsigned int bpc;
292 
293         /**
294          * @subpixel_order: Subpixel order of LCD panels.
295          */
296         enum subpixel_order subpixel_order;
297 
298 #define DRM_COLOR_FORMAT_RGB444         (1<<0)
299 #define DRM_COLOR_FORMAT_YCRCB444       (1<<1)
300 #define DRM_COLOR_FORMAT_YCRCB422       (1<<2)
301 #define DRM_COLOR_FORMAT_YCRCB420       (1<<3)
302 
303         /**
304          * @panel_orientation: Read only connector property for built-in panels,
305          * indicating the orientation of the panel vs the device's casing.
306          * drm_connector_init() sets this to DRM_MODE_PANEL_ORIENTATION_UNKNOWN.
307          * When not UNKNOWN this gets used by the drm_fb_helpers to rotate the
308          * fb to compensate and gets exported as prop to userspace.
309          */
310         int panel_orientation;
311 
312         /**
313          * @color_formats: HDMI Color formats, selects between RGB and YCrCb
314          * modes. Used DRM_COLOR_FORMAT\_ defines, which are _not_ the same ones
315          * as used to describe the pixel format in framebuffers, and also don't
316          * match the formats in @bus_formats which are shared with v4l.
317          */
318         u32 color_formats;
319 
320         /**
321          * @bus_formats: Pixel data format on the wire, somewhat redundant with
322          * @color_formats. Array of size @num_bus_formats encoded using
323          * MEDIA_BUS_FMT\_ defines shared with v4l and media drivers.
324          */
325         const u32 *bus_formats;
326         /**
327          * @num_bus_formats: Size of @bus_formats array.
328          */
329         unsigned int num_bus_formats;
330 
331 #define DRM_BUS_FLAG_DE_LOW             (1<<0)
332 #define DRM_BUS_FLAG_DE_HIGH            (1<<1)
333 /* drive data on pos. edge */
334 #define DRM_BUS_FLAG_PIXDATA_POSEDGE    (1<<2)
335 /* drive data on neg. edge */
336 #define DRM_BUS_FLAG_PIXDATA_NEGEDGE    (1<<3)
337 /* data is transmitted MSB to LSB on the bus */
338 #define DRM_BUS_FLAG_DATA_MSB_TO_LSB    (1<<4)
339 /* data is transmitted LSB to MSB on the bus */
340 #define DRM_BUS_FLAG_DATA_LSB_TO_MSB    (1<<5)
341 /* drive sync on pos. edge */
342 #define DRM_BUS_FLAG_SYNC_POSEDGE       (1<<6)
343 /* drive sync on neg. edge */
344 #define DRM_BUS_FLAG_SYNC_NEGEDGE       (1<<7)
345 
346         /**
347          * @bus_flags: Additional information (like pixel signal polarity) for
348          * the pixel data on the bus, using DRM_BUS_FLAGS\_ defines.
349          */
350         u32 bus_flags;
351 
352         /**
353          * @max_tmds_clock: Maximum TMDS clock rate supported by the
354          * sink in kHz. 0 means undefined.
355          */
356         int max_tmds_clock;
357 
358         /**
359          * @dvi_dual: Dual-link DVI sink?
360          */
361         bool dvi_dual;
362 
363         /**
364          * @has_hdmi_infoframe: Does the sink support the HDMI infoframe?
365          */
366         bool has_hdmi_infoframe;
367 
368         /**
369          * @edid_hdmi_dc_modes: Mask of supported hdmi deep color modes. Even
370          * more stuff redundant with @bus_formats.
371          */
372         u8 edid_hdmi_dc_modes;
373 
374         /**
375          * @cea_rev: CEA revision of the HDMI sink.
376          */
377         u8 cea_rev;
378 
379         /**
380          * @hdmi: advance features of a HDMI sink.
381          */
382         struct drm_hdmi_info hdmi;
383 
384         /**
385          * @non_desktop: Non desktop display (HMD).
386          */
387         bool non_desktop;
388 };
389 
390 int drm_display_info_set_bus_formats(struct drm_display_info *info,
391                                      const u32 *formats,
392                                      unsigned int num_formats);
393 
394 /**
395  * struct drm_tv_connector_state - TV connector related states
396  * @subconnector: selected subconnector
397  * @margins: margins
398  * @margins.left: left margin
399  * @margins.right: right margin
400  * @margins.top: top margin
401  * @margins.bottom: bottom margin
402  * @mode: TV mode
403  * @brightness: brightness in percent
404  * @contrast: contrast in percent
405  * @flicker_reduction: flicker reduction in percent
406  * @overscan: overscan in percent
407  * @saturation: saturation in percent
408  * @hue: hue in percent
409  */
410 struct drm_tv_connector_state {
411         enum drm_mode_subconnector subconnector;
412         struct {
413                 unsigned int left;
414                 unsigned int right;
415                 unsigned int top;
416                 unsigned int bottom;
417         } margins;
418         unsigned int mode;
419         unsigned int brightness;
420         unsigned int contrast;
421         unsigned int flicker_reduction;
422         unsigned int overscan;
423         unsigned int saturation;
424         unsigned int hue;
425 };
426 
427 /**
428  * struct drm_connector_state - mutable connector state
429  */
430 struct drm_connector_state {
431         /** @connector: backpointer to the connector */
432         struct drm_connector *connector;
433 
434         /**
435          * @crtc: CRTC to connect connector to, NULL if disabled.
436          *
437          * Do not change this directly, use drm_atomic_set_crtc_for_connector()
438          * instead.
439          */
440         struct drm_crtc *crtc;
441 
442         /**
443          * @best_encoder:
444          *
445          * Used by the atomic helpers to select the encoder, through the
446          * &drm_connector_helper_funcs.atomic_best_encoder or
447          * &drm_connector_helper_funcs.best_encoder callbacks.
448          */
449         struct drm_encoder *best_encoder;
450 
451         /**
452          * @link_status: Connector link_status to keep track of whether link is
453          * GOOD or BAD to notify userspace if retraining is necessary.
454          */
455         enum drm_link_status link_status;
456 
457         /** @state: backpointer to global drm_atomic_state */
458         struct drm_atomic_state *state;
459 
460         /**
461          * @commit: Tracks the pending commit to prevent use-after-free conditions.
462          *
463          * Is only set when @crtc is NULL.
464          */
465         struct drm_crtc_commit *commit;
466 
467         /** @tv: TV connector state */
468         struct drm_tv_connector_state tv;
469 
470         /**
471          * @picture_aspect_ratio: Connector property to control the
472          * HDMI infoframe aspect ratio setting.
473          *
474          * The %DRM_MODE_PICTURE_ASPECT_\* values much match the
475          * values for &enum hdmi_picture_aspect
476          */
477         enum hdmi_picture_aspect picture_aspect_ratio;
478 
479         /**
480          * @content_type: Connector property to control the
481          * HDMI infoframe content type setting.
482          * The %DRM_MODE_CONTENT_TYPE_\* values much
483          * match the values.
484          */
485         unsigned int content_type;
486 
487         /**
488          * @scaling_mode: Connector property to control the
489          * upscaling, mostly used for built-in panels.
490          */
491         unsigned int scaling_mode;
492 
493         /**
494          * @content_protection: Connector property to request content
495          * protection. This is most commonly used for HDCP.
496          */
497         unsigned int content_protection;
498 
499         /**
500          * @writeback_job: Writeback job for writeback connectors
501          *
502          * Holds the framebuffer and out-fence for a writeback connector. As
503          * the writeback completion may be asynchronous to the normal commit
504          * cycle, the writeback job lifetime is managed separately from the
505          * normal atomic state by this object.
506          *
507          * See also: drm_writeback_queue_job() and
508          * drm_writeback_signal_completion()
509          */
510         struct drm_writeback_job *writeback_job;
511 
512         /**
513          * @max_requested_bpc: Connector property to limit the maximum bit
514          * depth of the pixels.
515          */
516         u8 max_requested_bpc;
517 
518         /**
519          * @max_bpc: Connector max_bpc based on the requested max_bpc property
520          * and the connector bpc limitations obtained from edid.
521          */
522         u8 max_bpc;
523 };
524 
525 /**
526  * struct drm_connector_funcs - control connectors on a given device
527  *
528  * Each CRTC may have one or more connectors attached to it.  The functions
529  * below allow the core DRM code to control connectors, enumerate available modes,
530  * etc.
531  */
532 struct drm_connector_funcs {
533         /**
534          * @dpms:
535          *
536          * Legacy entry point to set the per-connector DPMS state. Legacy DPMS
537          * is exposed as a standard property on the connector, but diverted to
538          * this callback in the drm core. Note that atomic drivers don't
539          * implement the 4 level DPMS support on the connector any more, but
540          * instead only have an on/off "ACTIVE" property on the CRTC object.
541          *
542          * This hook is not used by atomic drivers, remapping of the legacy DPMS
543          * property is entirely handled in the DRM core.
544          *
545          * RETURNS:
546          *
547          * 0 on success or a negative error code on failure.
548          */
549         int (*dpms)(struct drm_connector *connector, int mode);
550 
551         /**
552          * @reset:
553          *
554          * Reset connector hardware and software state to off. This function isn't
555          * called by the core directly, only through drm_mode_config_reset().
556          * It's not a helper hook only for historical reasons.
557          *
558          * Atomic drivers can use drm_atomic_helper_connector_reset() to reset
559          * atomic state using this hook.
560          */
561         void (*reset)(struct drm_connector *connector);
562 
563         /**
564          * @detect:
565          *
566          * Check to see if anything is attached to the connector. The parameter
567          * force is set to false whilst polling, true when checking the
568          * connector due to a user request. force can be used by the driver to
569          * avoid expensive, destructive operations during automated probing.
570          *
571          * This callback is optional, if not implemented the connector will be
572          * considered as always being attached.
573          *
574          * FIXME:
575          *
576          * Note that this hook is only called by the probe helper. It's not in
577          * the helper library vtable purely for historical reasons. The only DRM
578          * core entry point to probe connector state is @fill_modes.
579          *
580          * Note that the helper library will already hold
581          * &drm_mode_config.connection_mutex. Drivers which need to grab additional
582          * locks to avoid races with concurrent modeset changes need to use
583          * &drm_connector_helper_funcs.detect_ctx instead.
584          *
585          * RETURNS:
586          *
587          * drm_connector_status indicating the connector's status.
588          */
589         enum drm_connector_status (*detect)(struct drm_connector *connector,
590                                             bool force);
591 
592         /**
593          * @force:
594          *
595          * This function is called to update internal encoder state when the
596          * connector is forced to a certain state by userspace, either through
597          * the sysfs interfaces or on the kernel cmdline. In that case the
598          * @detect callback isn't called.
599          *
600          * FIXME:
601          *
602          * Note that this hook is only called by the probe helper. It's not in
603          * the helper library vtable purely for historical reasons. The only DRM
604          * core entry point to probe connector state is @fill_modes.
605          */
606         void (*force)(struct drm_connector *connector);
607 
608         /**
609          * @fill_modes:
610          *
611          * Entry point for output detection and basic mode validation. The
612          * driver should reprobe the output if needed (e.g. when hotplug
613          * handling is unreliable), add all detected modes to &drm_connector.modes
614          * and filter out any the device can't support in any configuration. It
615          * also needs to filter out any modes wider or higher than the
616          * parameters max_width and max_height indicate.
617          *
618          * The drivers must also prune any modes no longer valid from
619          * &drm_connector.modes. Furthermore it must update
620          * &drm_connector.status and &drm_connector.edid.  If no EDID has been
621          * received for this output connector->edid must be NULL.
622          *
623          * Drivers using the probe helpers should use
624          * drm_helper_probe_single_connector_modes() to implement this
625          * function.
626          *
627          * RETURNS:
628          *
629          * The number of modes detected and filled into &drm_connector.modes.
630          */
631         int (*fill_modes)(struct drm_connector *connector, uint32_t max_width, uint32_t max_height);
632 
633         /**
634          * @set_property:
635          *
636          * This is the legacy entry point to update a property attached to the
637          * connector.
638          *
639          * This callback is optional if the driver does not support any legacy
640          * driver-private properties. For atomic drivers it is not used because
641          * property handling is done entirely in the DRM core.
642          *
643          * RETURNS:
644          *
645          * 0 on success or a negative error code on failure.
646          */
647         int (*set_property)(struct drm_connector *connector, struct drm_property *property,
648                              uint64_t val);
649 
650         /**
651          * @late_register:
652          *
653          * This optional hook can be used to register additional userspace
654          * interfaces attached to the connector, light backlight control, i2c,
655          * DP aux or similar interfaces. It is called late in the driver load
656          * sequence from drm_connector_register() when registering all the
657          * core drm connector interfaces. Everything added from this callback
658          * should be unregistered in the early_unregister callback.
659          *
660          * This is called while holding &drm_connector.mutex.
661          *
662          * Returns:
663          *
664          * 0 on success, or a negative error code on failure.
665          */
666         int (*late_register)(struct drm_connector *connector);
667 
668         /**
669          * @early_unregister:
670          *
671          * This optional hook should be used to unregister the additional
672          * userspace interfaces attached to the connector from
673          * late_register(). It is called from drm_connector_unregister(),
674          * early in the driver unload sequence to disable userspace access
675          * before data structures are torndown.
676          *
677          * This is called while holding &drm_connector.mutex.
678          */
679         void (*early_unregister)(struct drm_connector *connector);
680 
681         /**
682          * @destroy:
683          *
684          * Clean up connector resources. This is called at driver unload time
685          * through drm_mode_config_cleanup(). It can also be called at runtime
686          * when a connector is being hot-unplugged for drivers that support
687          * connector hotplugging (e.g. DisplayPort MST).
688          */
689         void (*destroy)(struct drm_connector *connector);
690 
691         /**
692          * @atomic_duplicate_state:
693          *
694          * Duplicate the current atomic state for this connector and return it.
695          * The core and helpers guarantee that any atomic state duplicated with
696          * this hook and still owned by the caller (i.e. not transferred to the
697          * driver by calling &drm_mode_config_funcs.atomic_commit) will be
698          * cleaned up by calling the @atomic_destroy_state hook in this
699          * structure.
700          *
701          * This callback is mandatory for atomic drivers.
702          *
703          * Atomic drivers which don't subclass &struct drm_connector_state should use
704          * drm_atomic_helper_connector_duplicate_state(). Drivers that subclass the
705          * state structure to extend it with driver-private state should use
706          * __drm_atomic_helper_connector_duplicate_state() to make sure shared state is
707          * duplicated in a consistent fashion across drivers.
708          *
709          * It is an error to call this hook before &drm_connector.state has been
710          * initialized correctly.
711          *
712          * NOTE:
713          *
714          * If the duplicate state references refcounted resources this hook must
715          * acquire a reference for each of them. The driver must release these
716          * references again in @atomic_destroy_state.
717          *
718          * RETURNS:
719          *
720          * Duplicated atomic state or NULL when the allocation failed.
721          */
722         struct drm_connector_state *(*atomic_duplicate_state)(struct drm_connector *connector);
723 
724         /**
725          * @atomic_destroy_state:
726          *
727          * Destroy a state duplicated with @atomic_duplicate_state and release
728          * or unreference all resources it references
729          *
730          * This callback is mandatory for atomic drivers.
731          */
732         void (*atomic_destroy_state)(struct drm_connector *connector,
733                                      struct drm_connector_state *state);
734 
735         /**
736          * @atomic_set_property:
737          *
738          * Decode a driver-private property value and store the decoded value
739          * into the passed-in state structure. Since the atomic core decodes all
740          * standardized properties (even for extensions beyond the core set of
741          * properties which might not be implemented by all drivers) this
742          * requires drivers to subclass the state structure.
743          *
744          * Such driver-private properties should really only be implemented for
745          * truly hardware/vendor specific state. Instead it is preferred to
746          * standardize atomic extension and decode the properties used to expose
747          * such an extension in the core.
748          *
749          * Do not call this function directly, use
750          * drm_atomic_connector_set_property() instead.
751          *
752          * This callback is optional if the driver does not support any
753          * driver-private atomic properties.
754          *
755          * NOTE:
756          *
757          * This function is called in the state assembly phase of atomic
758          * modesets, which can be aborted for any reason (including on
759          * userspace's request to just check whether a configuration would be
760          * possible). Drivers MUST NOT touch any persistent state (hardware or
761          * software) or data structures except the passed in @state parameter.
762          *
763          * Also since userspace controls in which order properties are set this
764          * function must not do any input validation (since the state update is
765          * incomplete and hence likely inconsistent). Instead any such input
766          * validation must be done in the various atomic_check callbacks.
767          *
768          * RETURNS:
769          *
770          * 0 if the property has been found, -EINVAL if the property isn't
771          * implemented by the driver (which shouldn't ever happen, the core only
772          * asks for properties attached to this connector). No other validation
773          * is allowed by the driver. The core already checks that the property
774          * value is within the range (integer, valid enum value, ...) the driver
775          * set when registering the property.
776          */
777         int (*atomic_set_property)(struct drm_connector *connector,
778                                    struct drm_connector_state *state,
779                                    struct drm_property *property,
780                                    uint64_t val);
781 
782         /**
783          * @atomic_get_property:
784          *
785          * Reads out the decoded driver-private property. This is used to
786          * implement the GETCONNECTOR IOCTL.
787          *
788          * Do not call this function directly, use
789          * drm_atomic_connector_get_property() instead.
790          *
791          * This callback is optional if the driver does not support any
792          * driver-private atomic properties.
793          *
794          * RETURNS:
795          *
796          * 0 on success, -EINVAL if the property isn't implemented by the
797          * driver (which shouldn't ever happen, the core only asks for
798          * properties attached to this connector).
799          */
800         int (*atomic_get_property)(struct drm_connector *connector,
801                                    const struct drm_connector_state *state,
802                                    struct drm_property *property,
803                                    uint64_t *val);
804 
805         /**
806          * @atomic_print_state:
807          *
808          * If driver subclasses &struct drm_connector_state, it should implement
809          * this optional hook for printing additional driver specific state.
810          *
811          * Do not call this directly, use drm_atomic_connector_print_state()
812          * instead.
813          */
814         void (*atomic_print_state)(struct drm_printer *p,
815                                    const struct drm_connector_state *state);
816 };
817 
818 /* mode specified on the command line */
819 struct drm_cmdline_mode {
820         bool specified;
821         bool refresh_specified;
822         bool bpp_specified;
823         int xres, yres;
824         int bpp;
825         int refresh;
826         bool rb;
827         bool interlace;
828         bool cvt;
829         bool margins;
830         enum drm_connector_force force;
831 };
832 
833 /**
834  * struct drm_connector - central DRM connector control structure
835  *
836  * Each connector may be connected to one or more CRTCs, or may be clonable by
837  * another connector if they can share a CRTC.  Each connector also has a specific
838  * position in the broader display (referred to as a 'screen' though it could
839  * span multiple monitors).
840  */
841 struct drm_connector {
842         /** @dev: parent DRM device */
843         struct drm_device *dev;
844         /** @kdev: kernel device for sysfs attributes */
845         struct device *kdev;
846         /** @attr: sysfs attributes */
847         struct device_attribute *attr;
848 
849         /**
850          * @head:
851          *
852          * List of all connectors on a @dev, linked from
853          * &drm_mode_config.connector_list. Protected by
854          * &drm_mode_config.connector_list_lock, but please only use
855          * &drm_connector_list_iter to walk this list.
856          */
857         struct list_head head;
858 
859         /** @base: base KMS object */
860         struct drm_mode_object base;
861 
862         /** @name: human readable name, can be overwritten by the driver */
863         char *name;
864 
865         /**
866          * @mutex: Lock for general connector state, but currently only protects
867          * @registered. Most of the connector state is still protected by
868          * &drm_mode_config.mutex.
869          */
870         struct mutex mutex;
871 
872         /**
873          * @index: Compacted connector index, which matches the position inside
874          * the mode_config.list for drivers not supporting hot-add/removing. Can
875          * be used as an array index. It is invariant over the lifetime of the
876          * connector.
877          */
878         unsigned index;
879 
880         /**
881          * @connector_type:
882          * one of the DRM_MODE_CONNECTOR_<foo> types from drm_mode.h
883          */
884         int connector_type;
885         /** @connector_type_id: index into connector type enum */
886         int connector_type_id;
887         /**
888          * @interlace_allowed:
889          * Can this connector handle interlaced modes? Only used by
890          * drm_helper_probe_single_connector_modes() for mode filtering.
891          */
892         bool interlace_allowed;
893         /**
894          * @doublescan_allowed:
895          * Can this connector handle doublescan? Only used by
896          * drm_helper_probe_single_connector_modes() for mode filtering.
897          */
898         bool doublescan_allowed;
899         /**
900          * @stereo_allowed:
901          * Can this connector handle stereo modes? Only used by
902          * drm_helper_probe_single_connector_modes() for mode filtering.
903          */
904         bool stereo_allowed;
905 
906         /**
907          * @ycbcr_420_allowed : This bool indicates if this connector is
908          * capable of handling YCBCR 420 output. While parsing the EDID
909          * blocks, its very helpful to know, if the source is capable of
910          * handling YCBCR 420 outputs.
911          */
912         bool ycbcr_420_allowed;
913 
914         /**
915          * @registration_state: Is this connector initializing, exposed
916          * (registered) with userspace, or unregistered?
917          *
918          * Protected by @mutex.
919          */
920         enum drm_connector_registration_state registration_state;
921 
922         /**
923          * @modes:
924          * Modes available on this connector (from fill_modes() + user).
925          * Protected by &drm_mode_config.mutex.
926          */
927         struct list_head modes;
928 
929         /**
930          * @status:
931          * One of the drm_connector_status enums (connected, not, or unknown).
932          * Protected by &drm_mode_config.mutex.
933          */
934         enum drm_connector_status status;
935 
936         /**
937          * @probed_modes:
938          * These are modes added by probing with DDC or the BIOS, before
939          * filtering is applied. Used by the probe helpers. Protected by
940          * &drm_mode_config.mutex.
941          */
942         struct list_head probed_modes;
943 
944         /**
945          * @display_info: Display information is filled from EDID information
946          * when a display is detected. For non hot-pluggable displays such as
947          * flat panels in embedded systems, the driver should initialize the
948          * &drm_display_info.width_mm and &drm_display_info.height_mm fields
949          * with the physical size of the display.
950          *
951          * Protected by &drm_mode_config.mutex.
952          */
953         struct drm_display_info display_info;
954 
955         /** @funcs: connector control functions */
956         const struct drm_connector_funcs *funcs;
957 
958         /**
959          * @edid_blob_ptr: DRM property containing EDID if present. Protected by
960          * &drm_mode_config.mutex. This should be updated only by calling
961          * drm_connector_update_edid_property().
962          */
963         struct drm_property_blob *edid_blob_ptr;
964 
965         /** @properties: property tracking for this connector */
966         struct drm_object_properties properties;
967 
968         /**
969          * @scaling_mode_property: Optional atomic property to control the
970          * upscaling. See drm_connector_attach_content_protection_property().
971          */
972         struct drm_property *scaling_mode_property;
973 
974         /**
975          * @vrr_capable_property: Optional property to help userspace
976          * query hardware support for variable refresh rate on a connector.
977          * connector. Drivers can add the property to a connector by
978          * calling drm_connector_attach_vrr_capable_property().
979          *
980          * This should be updated only by calling
981          * drm_connector_set_vrr_capable_property().
982          */
983         struct drm_property *vrr_capable_property;
984 
985         /**
986          * @content_protection_property: DRM ENUM property for content
987          * protection. See drm_connector_attach_content_protection_property().
988          */
989         struct drm_property *content_protection_property;
990 
991         /**
992          * @path_blob_ptr:
993          *
994          * DRM blob property data for the DP MST path property. This should only
995          * be updated by calling drm_connector_set_path_property().
996          */
997         struct drm_property_blob *path_blob_ptr;
998 
999         /**
1000          * @max_bpc_property: Default connector property for the max bpc to be
1001          * driven out of the connector.
1002          */
1003         struct drm_property *max_bpc_property;
1004 
1005 #define DRM_CONNECTOR_POLL_HPD (1 << 0)
1006 #define DRM_CONNECTOR_POLL_CONNECT (1 << 1)
1007 #define DRM_CONNECTOR_POLL_DISCONNECT (1 << 2)
1008 
1009         /**
1010          * @polled:
1011          *
1012          * Connector polling mode, a combination of
1013          *
1014          * DRM_CONNECTOR_POLL_HPD
1015          *     The connector generates hotplug events and doesn't need to be
1016          *     periodically polled. The CONNECT and DISCONNECT flags must not
1017          *     be set together with the HPD flag.
1018          *
1019          * DRM_CONNECTOR_POLL_CONNECT
1020          *     Periodically poll the connector for connection.
1021          *
1022          * DRM_CONNECTOR_POLL_DISCONNECT
1023          *     Periodically poll the connector for disconnection, without
1024          *     causing flickering even when the connector is in use. DACs should
1025          *     rarely do this without a lot of testing.
1026          *
1027          * Set to 0 for connectors that don't support connection status
1028          * discovery.
1029          */
1030         uint8_t polled;
1031 
1032         /**
1033          * @dpms: Current dpms state. For legacy drivers the
1034          * &drm_connector_funcs.dpms callback must update this. For atomic
1035          * drivers, this is handled by the core atomic code, and drivers must
1036          * only take &drm_crtc_state.active into account.
1037          */
1038         int dpms;
1039 
1040         /** @helper_private: mid-layer private data */
1041         const struct drm_connector_helper_funcs *helper_private;
1042 
1043         /** @cmdline_mode: mode line parsed from the kernel cmdline for this connector */
1044         struct drm_cmdline_mode cmdline_mode;
1045         /** @force: a DRM_FORCE_<foo> state for forced mode sets */
1046         enum drm_connector_force force;
1047         /** @override_edid: has the EDID been overwritten through debugfs for testing? */
1048         bool override_edid;
1049 
1050 #define DRM_CONNECTOR_MAX_ENCODER 3
1051         /**
1052          * @encoder_ids: Valid encoders for this connector. Please only use
1053          * drm_connector_for_each_possible_encoder() to enumerate these.
1054          */
1055         uint32_t encoder_ids[DRM_CONNECTOR_MAX_ENCODER];
1056 
1057         /**
1058          * @encoder: Currently bound encoder driving this connector, if any.
1059          * Only really meaningful for non-atomic drivers. Atomic drivers should
1060          * instead look at &drm_connector_state.best_encoder, and in case they
1061          * need the CRTC driving this output, &drm_connector_state.crtc.
1062          */
1063         struct drm_encoder *encoder;
1064 
1065 #define MAX_ELD_BYTES   128
1066         /** @eld: EDID-like data, if present */
1067         uint8_t eld[MAX_ELD_BYTES];
1068         /** @latency_present: AV delay info from ELD, if found */
1069         bool latency_present[2];
1070         /**
1071          * @video_latency: Video latency info from ELD, if found.
1072          * [0]: progressive, [1]: interlaced
1073          */
1074         int video_latency[2];
1075         /**
1076          * @audio_latency: audio latency info from ELD, if found
1077          * [0]: progressive, [1]: interlaced
1078          */
1079         int audio_latency[2];
1080         /**
1081          * @null_edid_counter: track sinks that give us all zeros for the EDID.
1082          * Needed to workaround some HW bugs where we get all 0s
1083          */
1084         int null_edid_counter;
1085 
1086         /** @bad_edid_counter: track sinks that give us an EDID with invalid checksum */
1087         unsigned bad_edid_counter;
1088 
1089         /**
1090          * @edid_corrupt: Indicates whether the last read EDID was corrupt. Used
1091          * in Displayport compliance testing - Displayport Link CTS Core 1.2
1092          * rev1.1 4.2.2.6
1093          */
1094         bool edid_corrupt;
1095 
1096         /** @debugfs_entry: debugfs directory for this connector */
1097         struct dentry *debugfs_entry;
1098 
1099         /**
1100          * @state:
1101          *
1102          * Current atomic state for this connector.
1103          *
1104          * This is protected by &drm_mode_config.connection_mutex. Note that
1105          * nonblocking atomic commits access the current connector state without
1106          * taking locks. Either by going through the &struct drm_atomic_state
1107          * pointers, see for_each_oldnew_connector_in_state(),
1108          * for_each_old_connector_in_state() and
1109          * for_each_new_connector_in_state(). Or through careful ordering of
1110          * atomic commit operations as implemented in the atomic helpers, see
1111          * &struct drm_crtc_commit.
1112          */
1113         struct drm_connector_state *state;
1114 
1115         /* DisplayID bits. FIXME: Extract into a substruct? */
1116 
1117         /**
1118          * @tile_blob_ptr:
1119          *
1120          * DRM blob property data for the tile property (used mostly by DP MST).
1121          * This is meant for screens which are driven through separate display
1122          * pipelines represented by &drm_crtc, which might not be running with
1123          * genlocked clocks. For tiled panels which are genlocked, like
1124          * dual-link LVDS or dual-link DSI, the driver should try to not expose
1125          * the tiling and virtualize both &drm_crtc and &drm_plane if needed.
1126          *
1127          * This should only be updated by calling
1128          * drm_connector_set_tile_property().
1129          */
1130         struct drm_property_blob *tile_blob_ptr;
1131 
1132         /** @has_tile: is this connector connected to a tiled monitor */
1133         bool has_tile;
1134         /** @tile_group: tile group for the connected monitor */
1135         struct drm_tile_group *tile_group;
1136         /** @tile_is_single_monitor: whether the tile is one monitor housing */
1137         bool tile_is_single_monitor;
1138 
1139         /** @num_h_tile: number of horizontal tiles in the tile group */
1140         /** @num_v_tile: number of vertical tiles in the tile group */
1141         uint8_t num_h_tile, num_v_tile;
1142         /** @tile_h_loc: horizontal location of this tile */
1143         /** @tile_v_loc: vertical location of this tile */
1144         uint8_t tile_h_loc, tile_v_loc;
1145         /** @tile_h_size: horizontal size of this tile. */
1146         /** @tile_v_size: vertical size of this tile. */
1147         uint16_t tile_h_size, tile_v_size;
1148 
1149         /**
1150          * @free_node:
1151          *
1152          * List used only by &drm_connector_list_iter to be able to clean up a
1153          * connector from any context, in conjunction with
1154          * &drm_mode_config.connector_free_work.
1155          */
1156         struct llist_node free_node;
1157 };
1158 
1159 #define obj_to_connector(x) container_of(x, struct drm_connector, base)
1160 
1161 int drm_connector_init(struct drm_device *dev,
1162                        struct drm_connector *connector,
1163                        const struct drm_connector_funcs *funcs,
1164                        int connector_type);
1165 void drm_connector_attach_edid_property(struct drm_connector *connector);
1166 int drm_connector_register(struct drm_connector *connector);
1167 void drm_connector_unregister(struct drm_connector *connector);
1168 int drm_connector_attach_encoder(struct drm_connector *connector,
1169                                       struct drm_encoder *encoder);
1170 
1171 void drm_connector_cleanup(struct drm_connector *connector);
1172 
1173 static inline unsigned int drm_connector_index(const struct drm_connector *connector)
1174 {
1175         return connector->index;
1176 }
1177 
1178 static inline u32 drm_connector_mask(const struct drm_connector *connector)
1179 {
1180         return 1 << connector->index;
1181 }
1182 
1183 /**
1184  * drm_connector_lookup - lookup connector object
1185  * @dev: DRM device
1186  * @file_priv: drm file to check for lease against.
1187  * @id: connector object id
1188  *
1189  * This function looks up the connector object specified by id
1190  * add takes a reference to it.
1191  */
1192 static inline struct drm_connector *drm_connector_lookup(struct drm_device *dev,
1193                 struct drm_file *file_priv,
1194                 uint32_t id)
1195 {
1196         struct drm_mode_object *mo;
1197         mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_CONNECTOR);
1198         return mo ? obj_to_connector(mo) : NULL;
1199 }
1200 
1201 /**
1202  * drm_connector_get - acquire a connector reference
1203  * @connector: DRM connector
1204  *
1205  * This function increments the connector's refcount.
1206  */
1207 static inline void drm_connector_get(struct drm_connector *connector)
1208 {
1209         drm_mode_object_get(&connector->base);
1210 }
1211 
1212 /**
1213  * drm_connector_put - release a connector reference
1214  * @connector: DRM connector
1215  *
1216  * This function decrements the connector's reference count and frees the
1217  * object if the reference count drops to zero.
1218  */
1219 static inline void drm_connector_put(struct drm_connector *connector)
1220 {
1221         drm_mode_object_put(&connector->base);
1222 }
1223 
1224 /**
1225  * drm_connector_is_unregistered - has the connector been unregistered from
1226  * userspace?
1227  * @connector: DRM connector
1228  *
1229  * Checks whether or not @connector has been unregistered from userspace.
1230  *
1231  * Returns:
1232  * True if the connector was unregistered, false if the connector is
1233  * registered or has not yet been registered with userspace.
1234  */
1235 static inline bool
1236 drm_connector_is_unregistered(struct drm_connector *connector)
1237 {
1238         return READ_ONCE(connector->registration_state) ==
1239                 DRM_CONNECTOR_UNREGISTERED;
1240 }
1241 
1242 const char *drm_get_connector_status_name(enum drm_connector_status status);
1243 const char *drm_get_subpixel_order_name(enum subpixel_order order);
1244 const char *drm_get_dpms_name(int val);
1245 const char *drm_get_dvi_i_subconnector_name(int val);
1246 const char *drm_get_dvi_i_select_name(int val);
1247 const char *drm_get_tv_subconnector_name(int val);
1248 const char *drm_get_tv_select_name(int val);
1249 const char *drm_get_content_protection_name(int val);
1250 
1251 int drm_mode_create_dvi_i_properties(struct drm_device *dev);
1252 int drm_mode_create_tv_properties(struct drm_device *dev,
1253                                   unsigned int num_modes,
1254                                   const char * const modes[]);
1255 int drm_mode_create_scaling_mode_property(struct drm_device *dev);
1256 int drm_connector_attach_content_type_property(struct drm_connector *dev);
1257 int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
1258                                                u32 scaling_mode_mask);
1259 int drm_connector_attach_vrr_capable_property(
1260                 struct drm_connector *connector);
1261 int drm_connector_attach_content_protection_property(
1262                 struct drm_connector *connector);
1263 int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
1264 int drm_mode_create_content_type_property(struct drm_device *dev);
1265 void drm_hdmi_avi_infoframe_content_type(struct hdmi_avi_infoframe *frame,
1266                                          const struct drm_connector_state *conn_state);
1267 
1268 int drm_mode_create_suggested_offset_properties(struct drm_device *dev);
1269 
1270 int drm_connector_set_path_property(struct drm_connector *connector,
1271                                     const char *path);
1272 int drm_connector_set_tile_property(struct drm_connector *connector);
1273 int drm_connector_update_edid_property(struct drm_connector *connector,
1274                                        const struct edid *edid);
1275 void drm_connector_set_link_status_property(struct drm_connector *connector,
1276                                             uint64_t link_status);
1277 void drm_connector_set_vrr_capable_property(
1278                 struct drm_connector *connector, bool capable);
1279 int drm_connector_init_panel_orientation_property(
1280         struct drm_connector *connector, int width, int height);
1281 int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
1282                                           int min, int max);
1283 
1284 /**
1285  * struct drm_tile_group - Tile group metadata
1286  * @refcount: reference count
1287  * @dev: DRM device
1288  * @id: tile group id exposed to userspace
1289  * @group_data: Sink-private data identifying this group
1290  *
1291  * @group_data corresponds to displayid vend/prod/serial for external screens
1292  * with an EDID.
1293  */
1294 struct drm_tile_group {
1295         struct kref refcount;
1296         struct drm_device *dev;
1297         int id;
1298         u8 group_data[8];
1299 };
1300 
1301 struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
1302                                                   char topology[8]);
1303 struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
1304                                                char topology[8]);
1305 void drm_mode_put_tile_group(struct drm_device *dev,
1306                              struct drm_tile_group *tg);
1307 
1308 /**
1309  * struct drm_connector_list_iter - connector_list iterator
1310  *
1311  * This iterator tracks state needed to be able to walk the connector_list
1312  * within struct drm_mode_config. Only use together with
1313  * drm_connector_list_iter_begin(), drm_connector_list_iter_end() and
1314  * drm_connector_list_iter_next() respectively the convenience macro
1315  * drm_for_each_connector_iter().
1316  */
1317 struct drm_connector_list_iter {
1318 /* private: */
1319         struct drm_device *dev;
1320         struct drm_connector *conn;
1321 };
1322 
1323 void drm_connector_list_iter_begin(struct drm_device *dev,
1324                                    struct drm_connector_list_iter *iter);
1325 struct drm_connector *
1326 drm_connector_list_iter_next(struct drm_connector_list_iter *iter);
1327 void drm_connector_list_iter_end(struct drm_connector_list_iter *iter);
1328 
1329 bool drm_connector_has_possible_encoder(struct drm_connector *connector,
1330                                         struct drm_encoder *encoder);
1331 
1332 /**
1333  * drm_for_each_connector_iter - connector_list iterator macro
1334  * @connector: &struct drm_connector pointer used as cursor
1335  * @iter: &struct drm_connector_list_iter
1336  *
1337  * Note that @connector is only valid within the list body, if you want to use
1338  * @connector after calling drm_connector_list_iter_end() then you need to grab
1339  * your own reference first using drm_connector_get().
1340  */
1341 #define drm_for_each_connector_iter(connector, iter) \
1342         while ((connector = drm_connector_list_iter_next(iter)))
1343 
1344 /**
1345  * drm_connector_for_each_possible_encoder - iterate connector's possible encoders
1346  * @connector: &struct drm_connector pointer
1347  * @encoder: &struct drm_encoder pointer used as cursor
1348  * @__i: int iteration cursor, for macro-internal use
1349  */
1350 #define drm_connector_for_each_possible_encoder(connector, encoder, __i) \
1351         for ((__i) = 0; (__i) < ARRAY_SIZE((connector)->encoder_ids) && \
1352                      (connector)->encoder_ids[(__i)] != 0; (__i)++) \
1353                 for_each_if((encoder) = \
1354                             drm_encoder_find((connector)->dev, NULL, \
1355                                              (connector)->encoder_ids[(__i)])) \
1356 
1357 #endif
1358 

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