2 * Copyright (c) 2016 Intel Corporation
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.
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
24 #include <drm/drm_connector.h>
25 #include <drm/drm_edid.h>
26 #include <drm/drm_encoder.h>
28 #include "drm_crtc_internal.h"
29 #include "drm_internal.h"
34 * In DRM connectors are the general abstraction for display sinks, and include
35 * als fixed panels or anything else that can display pixels in some form. As
36 * opposed to all other KMS objects representing hardware (like CRTC, encoder or
37 * plane abstractions) connectors can be hotplugged and unplugged at runtime.
38 * Hence they are reference-counted using drm_connector_get() and
39 * drm_connector_put().
41 * KMS driver must create, initialize, register and attach at a &struct
42 * drm_connector for each such sink. The instance is created as other KMS
43 * objects and initialized by setting the following fields. The connector is
44 * initialized with a call to drm_connector_init() with a pointer to the
45 * &struct drm_connector_funcs and a connector type, and then exposed to
46 * userspace with a call to drm_connector_register().
48 * Connectors must be attached to an encoder to be used. For devices that map
49 * connectors to encoders 1:1, the connector should be attached at
50 * initialization time with a call to drm_mode_connector_attach_encoder(). The
51 * driver must also set the &drm_connector.encoder field to point to the
54 * For connectors which are not fixed (like built-in panels) the driver needs to
55 * support hotplug notifications. The simplest way to do that is by using the
56 * probe helpers, see drm_kms_helper_poll_init() for connectors which don't have
57 * hardware support for hotplug interrupts. Connectors with hardware hotplug
58 * support can instead use e.g. drm_helper_hpd_irq_event().
61 struct drm_conn_prop_enum_list
{
68 * Connector and encoder types.
70 static struct drm_conn_prop_enum_list drm_connector_enum_list
[] = {
71 { DRM_MODE_CONNECTOR_Unknown
, "Unknown" },
72 { DRM_MODE_CONNECTOR_VGA
, "VGA" },
73 { DRM_MODE_CONNECTOR_DVII
, "DVI-I" },
74 { DRM_MODE_CONNECTOR_DVID
, "DVI-D" },
75 { DRM_MODE_CONNECTOR_DVIA
, "DVI-A" },
76 { DRM_MODE_CONNECTOR_Composite
, "Composite" },
77 { DRM_MODE_CONNECTOR_SVIDEO
, "SVIDEO" },
78 { DRM_MODE_CONNECTOR_LVDS
, "LVDS" },
79 { DRM_MODE_CONNECTOR_Component
, "Component" },
80 { DRM_MODE_CONNECTOR_9PinDIN
, "DIN" },
81 { DRM_MODE_CONNECTOR_DisplayPort
, "DP" },
82 { DRM_MODE_CONNECTOR_HDMIA
, "HDMI-A" },
83 { DRM_MODE_CONNECTOR_HDMIB
, "HDMI-B" },
84 { DRM_MODE_CONNECTOR_TV
, "TV" },
85 { DRM_MODE_CONNECTOR_eDP
, "eDP" },
86 { DRM_MODE_CONNECTOR_VIRTUAL
, "Virtual" },
87 { DRM_MODE_CONNECTOR_DSI
, "DSI" },
88 { DRM_MODE_CONNECTOR_DPI
, "DPI" },
91 void drm_connector_ida_init(void)
95 for (i
= 0; i
< ARRAY_SIZE(drm_connector_enum_list
); i
++)
96 ida_init(&drm_connector_enum_list
[i
].ida
);
99 void drm_connector_ida_destroy(void)
103 for (i
= 0; i
< ARRAY_SIZE(drm_connector_enum_list
); i
++)
104 ida_destroy(&drm_connector_enum_list
[i
].ida
);
108 * drm_connector_get_cmdline_mode - reads the user's cmdline mode
109 * @connector: connector to quwery
111 * The kernel supports per-connector configuration of its consoles through
112 * use of the video= parameter. This function parses that option and
113 * extracts the user's specified mode (or enable/disable status) for a
114 * particular connector. This is typically only used during the early fbdev
117 static void drm_connector_get_cmdline_mode(struct drm_connector
*connector
)
119 struct drm_cmdline_mode
*mode
= &connector
->cmdline_mode
;
122 if (fb_get_options(connector
->name
, &option
))
125 if (!drm_mode_parse_command_line_for_connector(option
,
131 DRM_INFO("forcing %s connector %s\n", connector
->name
,
132 drm_get_connector_force_name(mode
->force
));
133 connector
->force
= mode
->force
;
136 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
138 mode
->xres
, mode
->yres
,
139 mode
->refresh_specified
? mode
->refresh
: 60,
140 mode
->rb
? " reduced blanking" : "",
141 mode
->margins
? " with margins" : "",
142 mode
->interlace
? " interlaced" : "");
145 static void drm_connector_free(struct kref
*kref
)
147 struct drm_connector
*connector
=
148 container_of(kref
, struct drm_connector
, base
.refcount
);
149 struct drm_device
*dev
= connector
->dev
;
151 drm_mode_object_unregister(dev
, &connector
->base
);
152 connector
->funcs
->destroy(connector
);
156 * drm_connector_init - Init a preallocated connector
158 * @connector: the connector to init
159 * @funcs: callbacks for this connector
160 * @connector_type: user visible type of the connector
162 * Initialises a preallocated connector. Connectors should be
163 * subclassed as part of driver connector objects.
166 * Zero on success, error code on failure.
168 int drm_connector_init(struct drm_device
*dev
,
169 struct drm_connector
*connector
,
170 const struct drm_connector_funcs
*funcs
,
173 struct drm_mode_config
*config
= &dev
->mode_config
;
175 struct ida
*connector_ida
=
176 &drm_connector_enum_list
[connector_type
].ida
;
178 ret
= __drm_mode_object_add(dev
, &connector
->base
,
179 DRM_MODE_OBJECT_CONNECTOR
,
180 false, drm_connector_free
);
184 connector
->base
.properties
= &connector
->properties
;
185 connector
->dev
= dev
;
186 connector
->funcs
= funcs
;
188 ret
= ida_simple_get(&config
->connector_ida
, 0, 0, GFP_KERNEL
);
191 connector
->index
= ret
;
194 connector
->connector_type
= connector_type
;
195 connector
->connector_type_id
=
196 ida_simple_get(connector_ida
, 1, 0, GFP_KERNEL
);
197 if (connector
->connector_type_id
< 0) {
198 ret
= connector
->connector_type_id
;
202 kasprintf(GFP_KERNEL
, "%s-%d",
203 drm_connector_enum_list
[connector_type
].name
,
204 connector
->connector_type_id
);
205 if (!connector
->name
) {
207 goto out_put_type_id
;
210 INIT_LIST_HEAD(&connector
->probed_modes
);
211 INIT_LIST_HEAD(&connector
->modes
);
212 mutex_init(&connector
->mutex
);
213 connector
->edid_blob_ptr
= NULL
;
214 connector
->status
= connector_status_unknown
;
216 drm_connector_get_cmdline_mode(connector
);
218 /* We should add connectors at the end to avoid upsetting the connector
220 spin_lock_irq(&config
->connector_list_lock
);
221 list_add_tail(&connector
->head
, &config
->connector_list
);
222 config
->num_connector
++;
223 spin_unlock_irq(&config
->connector_list_lock
);
225 if (connector_type
!= DRM_MODE_CONNECTOR_VIRTUAL
)
226 drm_object_attach_property(&connector
->base
,
227 config
->edid_property
,
230 drm_object_attach_property(&connector
->base
,
231 config
->dpms_property
, 0);
233 drm_object_attach_property(&connector
->base
,
234 config
->link_status_property
,
237 if (drm_core_check_feature(dev
, DRIVER_ATOMIC
)) {
238 drm_object_attach_property(&connector
->base
, config
->prop_crtc_id
, 0);
241 connector
->debugfs_entry
= NULL
;
244 ida_simple_remove(connector_ida
, connector
->connector_type_id
);
247 ida_simple_remove(&config
->connector_ida
, connector
->index
);
250 drm_mode_object_unregister(dev
, &connector
->base
);
254 EXPORT_SYMBOL(drm_connector_init
);
257 * drm_mode_connector_attach_encoder - attach a connector to an encoder
258 * @connector: connector to attach
259 * @encoder: encoder to attach @connector to
261 * This function links up a connector to an encoder. Note that the routing
262 * restrictions between encoders and crtcs are exposed to userspace through the
263 * possible_clones and possible_crtcs bitmasks.
266 * Zero on success, negative errno on failure.
268 int drm_mode_connector_attach_encoder(struct drm_connector
*connector
,
269 struct drm_encoder
*encoder
)
274 * In the past, drivers have attempted to model the static association
275 * of connector to encoder in simple connector/encoder devices using a
276 * direct assignment of connector->encoder = encoder. This connection
277 * is a logical one and the responsibility of the core, so drivers are
278 * expected not to mess with this.
280 * Note that the error return should've been enough here, but a large
281 * majority of drivers ignores the return value, so add in a big WARN
282 * to get people's attention.
284 if (WARN_ON(connector
->encoder
))
287 for (i
= 0; i
< DRM_CONNECTOR_MAX_ENCODER
; i
++) {
288 if (connector
->encoder_ids
[i
] == 0) {
289 connector
->encoder_ids
[i
] = encoder
->base
.id
;
295 EXPORT_SYMBOL(drm_mode_connector_attach_encoder
);
297 static void drm_mode_remove(struct drm_connector
*connector
,
298 struct drm_display_mode
*mode
)
300 list_del(&mode
->head
);
301 drm_mode_destroy(connector
->dev
, mode
);
305 * drm_connector_cleanup - cleans up an initialised connector
306 * @connector: connector to cleanup
308 * Cleans up the connector but doesn't free the object.
310 void drm_connector_cleanup(struct drm_connector
*connector
)
312 struct drm_device
*dev
= connector
->dev
;
313 struct drm_display_mode
*mode
, *t
;
315 /* The connector should have been removed from userspace long before
316 * it is finally destroyed.
318 if (WARN_ON(connector
->registered
))
319 drm_connector_unregister(connector
);
321 if (connector
->tile_group
) {
322 drm_mode_put_tile_group(dev
, connector
->tile_group
);
323 connector
->tile_group
= NULL
;
326 list_for_each_entry_safe(mode
, t
, &connector
->probed_modes
, head
)
327 drm_mode_remove(connector
, mode
);
329 list_for_each_entry_safe(mode
, t
, &connector
->modes
, head
)
330 drm_mode_remove(connector
, mode
);
332 ida_simple_remove(&drm_connector_enum_list
[connector
->connector_type
].ida
,
333 connector
->connector_type_id
);
335 ida_simple_remove(&dev
->mode_config
.connector_ida
,
338 kfree(connector
->display_info
.bus_formats
);
339 drm_mode_object_unregister(dev
, &connector
->base
);
340 kfree(connector
->name
);
341 connector
->name
= NULL
;
342 spin_lock_irq(&dev
->mode_config
.connector_list_lock
);
343 list_del(&connector
->head
);
344 dev
->mode_config
.num_connector
--;
345 spin_unlock_irq(&dev
->mode_config
.connector_list_lock
);
347 WARN_ON(connector
->state
&& !connector
->funcs
->atomic_destroy_state
);
348 if (connector
->state
&& connector
->funcs
->atomic_destroy_state
)
349 connector
->funcs
->atomic_destroy_state(connector
,
352 mutex_destroy(&connector
->mutex
);
354 memset(connector
, 0, sizeof(*connector
));
356 EXPORT_SYMBOL(drm_connector_cleanup
);
359 * drm_connector_register - register a connector
360 * @connector: the connector to register
362 * Register userspace interfaces for a connector
365 * Zero on success, error code on failure.
367 int drm_connector_register(struct drm_connector
*connector
)
371 if (!connector
->dev
->registered
)
374 mutex_lock(&connector
->mutex
);
375 if (connector
->registered
)
378 ret
= drm_sysfs_connector_add(connector
);
382 ret
= drm_debugfs_connector_add(connector
);
387 if (connector
->funcs
->late_register
) {
388 ret
= connector
->funcs
->late_register(connector
);
393 drm_mode_object_register(connector
->dev
, &connector
->base
);
395 connector
->registered
= true;
399 drm_debugfs_connector_remove(connector
);
401 drm_sysfs_connector_remove(connector
);
403 mutex_unlock(&connector
->mutex
);
406 EXPORT_SYMBOL(drm_connector_register
);
409 * drm_connector_unregister - unregister a connector
410 * @connector: the connector to unregister
412 * Unregister userspace interfaces for a connector
414 void drm_connector_unregister(struct drm_connector
*connector
)
416 mutex_lock(&connector
->mutex
);
417 if (!connector
->registered
) {
418 mutex_unlock(&connector
->mutex
);
422 if (connector
->funcs
->early_unregister
)
423 connector
->funcs
->early_unregister(connector
);
425 drm_sysfs_connector_remove(connector
);
426 drm_debugfs_connector_remove(connector
);
428 connector
->registered
= false;
429 mutex_unlock(&connector
->mutex
);
431 EXPORT_SYMBOL(drm_connector_unregister
);
433 void drm_connector_unregister_all(struct drm_device
*dev
)
435 struct drm_connector
*connector
;
436 struct drm_connector_list_iter conn_iter
;
438 drm_connector_list_iter_begin(dev
, &conn_iter
);
439 drm_for_each_connector_iter(connector
, &conn_iter
)
440 drm_connector_unregister(connector
);
441 drm_connector_list_iter_end(&conn_iter
);
444 int drm_connector_register_all(struct drm_device
*dev
)
446 struct drm_connector
*connector
;
447 struct drm_connector_list_iter conn_iter
;
450 drm_connector_list_iter_begin(dev
, &conn_iter
);
451 drm_for_each_connector_iter(connector
, &conn_iter
) {
452 ret
= drm_connector_register(connector
);
456 drm_connector_list_iter_end(&conn_iter
);
459 drm_connector_unregister_all(dev
);
464 * drm_get_connector_status_name - return a string for connector status
465 * @status: connector status to compute name of
467 * In contrast to the other drm_get_*_name functions this one here returns a
468 * const pointer and hence is threadsafe.
470 const char *drm_get_connector_status_name(enum drm_connector_status status
)
472 if (status
== connector_status_connected
)
474 else if (status
== connector_status_disconnected
)
475 return "disconnected";
479 EXPORT_SYMBOL(drm_get_connector_status_name
);
482 * drm_get_connector_force_name - return a string for connector force
483 * @force: connector force to get name of
485 * Returns: const pointer to name.
487 const char *drm_get_connector_force_name(enum drm_connector_force force
)
490 case DRM_FORCE_UNSPECIFIED
:
491 return "unspecified";
496 case DRM_FORCE_ON_DIGITAL
:
503 #ifdef CONFIG_LOCKDEP
504 static struct lockdep_map connector_list_iter_dep_map
= {
505 .name
= "drm_connector_list_iter"
510 * drm_connector_list_iter_begin - initialize a connector_list iterator
512 * @iter: connector_list iterator
514 * Sets @iter up to walk the &drm_mode_config.connector_list of @dev. @iter
515 * must always be cleaned up again by calling drm_connector_list_iter_end().
516 * Iteration itself happens using drm_connector_list_iter_next() or
517 * drm_for_each_connector_iter().
519 void drm_connector_list_iter_begin(struct drm_device
*dev
,
520 struct drm_connector_list_iter
*iter
)
524 lock_acquire_shared_recursive(&connector_list_iter_dep_map
, 0, 1, NULL
, _RET_IP_
);
526 EXPORT_SYMBOL(drm_connector_list_iter_begin
);
529 * drm_connector_list_iter_next - return next connector
530 * @iter: connectr_list iterator
532 * Returns the next connector for @iter, or NULL when the list walk has
535 struct drm_connector
*
536 drm_connector_list_iter_next(struct drm_connector_list_iter
*iter
)
538 struct drm_connector
*old_conn
= iter
->conn
;
539 struct drm_mode_config
*config
= &iter
->dev
->mode_config
;
540 struct list_head
*lhead
;
543 spin_lock_irqsave(&config
->connector_list_lock
, flags
);
544 lhead
= old_conn
? &old_conn
->head
: &config
->connector_list
;
547 if (lhead
->next
== &config
->connector_list
) {
553 iter
->conn
= list_entry(lhead
, struct drm_connector
, head
);
555 /* loop until it's not a zombie connector */
556 } while (!kref_get_unless_zero(&iter
->conn
->base
.refcount
));
557 spin_unlock_irqrestore(&config
->connector_list_lock
, flags
);
560 drm_connector_put(old_conn
);
564 EXPORT_SYMBOL(drm_connector_list_iter_next
);
567 * drm_connector_list_iter_end - tear down a connector_list iterator
568 * @iter: connector_list iterator
570 * Tears down @iter and releases any resources (like &drm_connector references)
571 * acquired while walking the list. This must always be called, both when the
572 * iteration completes fully or when it was aborted without walking the entire
575 void drm_connector_list_iter_end(struct drm_connector_list_iter
*iter
)
579 drm_connector_put(iter
->conn
);
580 lock_release(&connector_list_iter_dep_map
, 0, _RET_IP_
);
582 EXPORT_SYMBOL(drm_connector_list_iter_end
);
584 static const struct drm_prop_enum_list drm_subpixel_enum_list
[] = {
585 { SubPixelUnknown
, "Unknown" },
586 { SubPixelHorizontalRGB
, "Horizontal RGB" },
587 { SubPixelHorizontalBGR
, "Horizontal BGR" },
588 { SubPixelVerticalRGB
, "Vertical RGB" },
589 { SubPixelVerticalBGR
, "Vertical BGR" },
590 { SubPixelNone
, "None" },
594 * drm_get_subpixel_order_name - return a string for a given subpixel enum
595 * @order: enum of subpixel_order
597 * Note you could abuse this and return something out of bounds, but that
598 * would be a caller error. No unscrubbed user data should make it here.
600 const char *drm_get_subpixel_order_name(enum subpixel_order order
)
602 return drm_subpixel_enum_list
[order
].name
;
604 EXPORT_SYMBOL(drm_get_subpixel_order_name
);
606 static const struct drm_prop_enum_list drm_dpms_enum_list
[] = {
607 { DRM_MODE_DPMS_ON
, "On" },
608 { DRM_MODE_DPMS_STANDBY
, "Standby" },
609 { DRM_MODE_DPMS_SUSPEND
, "Suspend" },
610 { DRM_MODE_DPMS_OFF
, "Off" }
612 DRM_ENUM_NAME_FN(drm_get_dpms_name
, drm_dpms_enum_list
)
614 static const struct drm_prop_enum_list drm_link_status_enum_list
[] = {
615 { DRM_MODE_LINK_STATUS_GOOD
, "Good" },
616 { DRM_MODE_LINK_STATUS_BAD
, "Bad" },
620 * drm_display_info_set_bus_formats - set the supported bus formats
621 * @info: display info to store bus formats in
622 * @formats: array containing the supported bus formats
623 * @num_formats: the number of entries in the fmts array
625 * Store the supported bus formats in display info structure.
626 * See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for
627 * a full list of available formats.
629 int drm_display_info_set_bus_formats(struct drm_display_info
*info
,
631 unsigned int num_formats
)
635 if (!formats
&& num_formats
)
638 if (formats
&& num_formats
) {
639 fmts
= kmemdup(formats
, sizeof(*formats
) * num_formats
,
645 kfree(info
->bus_formats
);
646 info
->bus_formats
= fmts
;
647 info
->num_bus_formats
= num_formats
;
651 EXPORT_SYMBOL(drm_display_info_set_bus_formats
);
653 /* Optional connector properties. */
654 static const struct drm_prop_enum_list drm_scaling_mode_enum_list
[] = {
655 { DRM_MODE_SCALE_NONE
, "None" },
656 { DRM_MODE_SCALE_FULLSCREEN
, "Full" },
657 { DRM_MODE_SCALE_CENTER
, "Center" },
658 { DRM_MODE_SCALE_ASPECT
, "Full aspect" },
661 static const struct drm_prop_enum_list drm_aspect_ratio_enum_list
[] = {
662 { DRM_MODE_PICTURE_ASPECT_NONE
, "Automatic" },
663 { DRM_MODE_PICTURE_ASPECT_4_3
, "4:3" },
664 { DRM_MODE_PICTURE_ASPECT_16_9
, "16:9" },
667 static const struct drm_prop_enum_list drm_dvi_i_select_enum_list
[] = {
668 { DRM_MODE_SUBCONNECTOR_Automatic
, "Automatic" }, /* DVI-I and TV-out */
669 { DRM_MODE_SUBCONNECTOR_DVID
, "DVI-D" }, /* DVI-I */
670 { DRM_MODE_SUBCONNECTOR_DVIA
, "DVI-A" }, /* DVI-I */
672 DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name
, drm_dvi_i_select_enum_list
)
674 static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list
[] = {
675 { DRM_MODE_SUBCONNECTOR_Unknown
, "Unknown" }, /* DVI-I and TV-out */
676 { DRM_MODE_SUBCONNECTOR_DVID
, "DVI-D" }, /* DVI-I */
677 { DRM_MODE_SUBCONNECTOR_DVIA
, "DVI-A" }, /* DVI-I */
679 DRM_ENUM_NAME_FN(drm_get_dvi_i_subconnector_name
,
680 drm_dvi_i_subconnector_enum_list
)
682 static const struct drm_prop_enum_list drm_tv_select_enum_list
[] = {
683 { DRM_MODE_SUBCONNECTOR_Automatic
, "Automatic" }, /* DVI-I and TV-out */
684 { DRM_MODE_SUBCONNECTOR_Composite
, "Composite" }, /* TV-out */
685 { DRM_MODE_SUBCONNECTOR_SVIDEO
, "SVIDEO" }, /* TV-out */
686 { DRM_MODE_SUBCONNECTOR_Component
, "Component" }, /* TV-out */
687 { DRM_MODE_SUBCONNECTOR_SCART
, "SCART" }, /* TV-out */
689 DRM_ENUM_NAME_FN(drm_get_tv_select_name
, drm_tv_select_enum_list
)
691 static const struct drm_prop_enum_list drm_tv_subconnector_enum_list
[] = {
692 { DRM_MODE_SUBCONNECTOR_Unknown
, "Unknown" }, /* DVI-I and TV-out */
693 { DRM_MODE_SUBCONNECTOR_Composite
, "Composite" }, /* TV-out */
694 { DRM_MODE_SUBCONNECTOR_SVIDEO
, "SVIDEO" }, /* TV-out */
695 { DRM_MODE_SUBCONNECTOR_Component
, "Component" }, /* TV-out */
696 { DRM_MODE_SUBCONNECTOR_SCART
, "SCART" }, /* TV-out */
698 DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name
,
699 drm_tv_subconnector_enum_list
)
702 * DOC: standard connector properties
704 * DRM connectors have a few standardized properties:
707 * Blob property which contains the current EDID read from the sink. This
708 * is useful to parse sink identification information like vendor, model
709 * and serial. Drivers should update this property by calling
710 * drm_mode_connector_update_edid_property(), usually after having parsed
711 * the EDID using drm_add_edid_modes(). Userspace cannot change this
714 * Legacy property for setting the power state of the connector. For atomic
715 * drivers this is only provided for backwards compatibility with existing
716 * drivers, it remaps to controlling the "ACTIVE" property on the CRTC the
717 * connector is linked to. Drivers should never set this property directly,
718 * it is handled by the DRM core by calling the &drm_connector_funcs.dpms
719 * callback. For atomic drivers the remapping to the "ACTIVE" property is
720 * implemented in the DRM core. This is the only standard connector
721 * property that userspace can change.
723 * Note that this property cannot be set through the MODE_ATOMIC ioctl,
724 * userspace must use "ACTIVE" on the CRTC instead.
728 * For userspace also running on legacy drivers the "DPMS" semantics are a
729 * lot more complicated. First, userspace cannot rely on the "DPMS" value
730 * returned by the GETCONNECTOR actually reflecting reality, because many
731 * drivers fail to update it. For atomic drivers this is taken care of in
732 * drm_atomic_helper_update_legacy_modeset_state().
734 * The second issue is that the DPMS state is only well-defined when the
735 * connector is connected to a CRTC. In atomic the DRM core enforces that
736 * "ACTIVE" is off in such a case, no such checks exists for "DPMS".
738 * Finally, when enabling an output using the legacy SETCONFIG ioctl then
739 * "DPMS" is forced to ON. But see above, that might not be reflected in
740 * the software value on legacy drivers.
742 * Summarizing: Only set "DPMS" when the connector is known to be enabled,
743 * assume that a successful SETCONFIG call also sets "DPMS" to on, and
744 * never read back the value of "DPMS" because it can be incorrect.
746 * Connector path property to identify how this sink is physically
747 * connected. Used by DP MST. This should be set by calling
748 * drm_mode_connector_set_path_property(), in the case of DP MST with the
749 * path property the MST manager created. Userspace cannot change this
752 * Connector tile group property to indicate how a set of DRM connector
753 * compose together into one logical screen. This is used by both high-res
754 * external screens (often only using a single cable, but exposing multiple
755 * DP MST sinks), or high-res integrated panels (like dual-link DSI) which
756 * are not gen-locked. Note that for tiled panels which are genlocked, like
757 * dual-link LVDS or dual-link DSI, the driver should try to not expose the
758 * tiling and virtualize both &drm_crtc and &drm_plane if needed. Drivers
759 * should update this value using drm_mode_connector_set_tile_property().
760 * Userspace cannot change this property.
762 * Connector link-status property to indicate the status of link. The default
763 * value of link-status is "GOOD". If something fails during or after modeset,
764 * the kernel driver may set this to "BAD" and issue a hotplug uevent. Drivers
765 * should update this value using drm_mode_connector_set_link_status_property().
767 * Connectors also have one standardized atomic property:
770 * Mode object ID of the &drm_crtc this connector should be connected to.
773 int drm_connector_create_standard_properties(struct drm_device
*dev
)
775 struct drm_property
*prop
;
777 prop
= drm_property_create(dev
, DRM_MODE_PROP_BLOB
|
778 DRM_MODE_PROP_IMMUTABLE
,
782 dev
->mode_config
.edid_property
= prop
;
784 prop
= drm_property_create_enum(dev
, 0,
785 "DPMS", drm_dpms_enum_list
,
786 ARRAY_SIZE(drm_dpms_enum_list
));
789 dev
->mode_config
.dpms_property
= prop
;
791 prop
= drm_property_create(dev
,
793 DRM_MODE_PROP_IMMUTABLE
,
797 dev
->mode_config
.path_property
= prop
;
799 prop
= drm_property_create(dev
,
801 DRM_MODE_PROP_IMMUTABLE
,
805 dev
->mode_config
.tile_property
= prop
;
807 prop
= drm_property_create_enum(dev
, 0, "link-status",
808 drm_link_status_enum_list
,
809 ARRAY_SIZE(drm_link_status_enum_list
));
812 dev
->mode_config
.link_status_property
= prop
;
818 * drm_mode_create_dvi_i_properties - create DVI-I specific connector properties
821 * Called by a driver the first time a DVI-I connector is made.
823 int drm_mode_create_dvi_i_properties(struct drm_device
*dev
)
825 struct drm_property
*dvi_i_selector
;
826 struct drm_property
*dvi_i_subconnector
;
828 if (dev
->mode_config
.dvi_i_select_subconnector_property
)
832 drm_property_create_enum(dev
, 0,
833 "select subconnector",
834 drm_dvi_i_select_enum_list
,
835 ARRAY_SIZE(drm_dvi_i_select_enum_list
));
836 dev
->mode_config
.dvi_i_select_subconnector_property
= dvi_i_selector
;
838 dvi_i_subconnector
= drm_property_create_enum(dev
, DRM_MODE_PROP_IMMUTABLE
,
840 drm_dvi_i_subconnector_enum_list
,
841 ARRAY_SIZE(drm_dvi_i_subconnector_enum_list
));
842 dev
->mode_config
.dvi_i_subconnector_property
= dvi_i_subconnector
;
846 EXPORT_SYMBOL(drm_mode_create_dvi_i_properties
);
849 * drm_create_tv_properties - create TV specific connector properties
851 * @num_modes: number of different TV formats (modes) supported
852 * @modes: array of pointers to strings containing name of each format
854 * Called by a driver's TV initialization routine, this function creates
855 * the TV specific connector properties for a given device. Caller is
856 * responsible for allocating a list of format names and passing them to
859 int drm_mode_create_tv_properties(struct drm_device
*dev
,
860 unsigned int num_modes
,
861 const char * const modes
[])
863 struct drm_property
*tv_selector
;
864 struct drm_property
*tv_subconnector
;
867 if (dev
->mode_config
.tv_select_subconnector_property
)
871 * Basic connector properties
873 tv_selector
= drm_property_create_enum(dev
, 0,
874 "select subconnector",
875 drm_tv_select_enum_list
,
876 ARRAY_SIZE(drm_tv_select_enum_list
));
880 dev
->mode_config
.tv_select_subconnector_property
= tv_selector
;
883 drm_property_create_enum(dev
, DRM_MODE_PROP_IMMUTABLE
,
885 drm_tv_subconnector_enum_list
,
886 ARRAY_SIZE(drm_tv_subconnector_enum_list
));
887 if (!tv_subconnector
)
889 dev
->mode_config
.tv_subconnector_property
= tv_subconnector
;
892 * Other, TV specific properties: margins & TV modes.
894 dev
->mode_config
.tv_left_margin_property
=
895 drm_property_create_range(dev
, 0, "left margin", 0, 100);
896 if (!dev
->mode_config
.tv_left_margin_property
)
899 dev
->mode_config
.tv_right_margin_property
=
900 drm_property_create_range(dev
, 0, "right margin", 0, 100);
901 if (!dev
->mode_config
.tv_right_margin_property
)
904 dev
->mode_config
.tv_top_margin_property
=
905 drm_property_create_range(dev
, 0, "top margin", 0, 100);
906 if (!dev
->mode_config
.tv_top_margin_property
)
909 dev
->mode_config
.tv_bottom_margin_property
=
910 drm_property_create_range(dev
, 0, "bottom margin", 0, 100);
911 if (!dev
->mode_config
.tv_bottom_margin_property
)
914 dev
->mode_config
.tv_mode_property
=
915 drm_property_create(dev
, DRM_MODE_PROP_ENUM
,
917 if (!dev
->mode_config
.tv_mode_property
)
920 for (i
= 0; i
< num_modes
; i
++)
921 drm_property_add_enum(dev
->mode_config
.tv_mode_property
, i
,
924 dev
->mode_config
.tv_brightness_property
=
925 drm_property_create_range(dev
, 0, "brightness", 0, 100);
926 if (!dev
->mode_config
.tv_brightness_property
)
929 dev
->mode_config
.tv_contrast_property
=
930 drm_property_create_range(dev
, 0, "contrast", 0, 100);
931 if (!dev
->mode_config
.tv_contrast_property
)
934 dev
->mode_config
.tv_flicker_reduction_property
=
935 drm_property_create_range(dev
, 0, "flicker reduction", 0, 100);
936 if (!dev
->mode_config
.tv_flicker_reduction_property
)
939 dev
->mode_config
.tv_overscan_property
=
940 drm_property_create_range(dev
, 0, "overscan", 0, 100);
941 if (!dev
->mode_config
.tv_overscan_property
)
944 dev
->mode_config
.tv_saturation_property
=
945 drm_property_create_range(dev
, 0, "saturation", 0, 100);
946 if (!dev
->mode_config
.tv_saturation_property
)
949 dev
->mode_config
.tv_hue_property
=
950 drm_property_create_range(dev
, 0, "hue", 0, 100);
951 if (!dev
->mode_config
.tv_hue_property
)
958 EXPORT_SYMBOL(drm_mode_create_tv_properties
);
961 * drm_mode_create_scaling_mode_property - create scaling mode property
964 * Called by a driver the first time it's needed, must be attached to desired
967 * Atomic drivers should use drm_connector_attach_scaling_mode_property()
968 * instead to correctly assign &drm_connector_state.picture_aspect_ratio
969 * in the atomic state.
971 int drm_mode_create_scaling_mode_property(struct drm_device
*dev
)
973 struct drm_property
*scaling_mode
;
975 if (dev
->mode_config
.scaling_mode_property
)
979 drm_property_create_enum(dev
, 0, "scaling mode",
980 drm_scaling_mode_enum_list
,
981 ARRAY_SIZE(drm_scaling_mode_enum_list
));
983 dev
->mode_config
.scaling_mode_property
= scaling_mode
;
987 EXPORT_SYMBOL(drm_mode_create_scaling_mode_property
);
990 * drm_connector_attach_scaling_mode_property - attach atomic scaling mode property
991 * @connector: connector to attach scaling mode property on.
992 * @scaling_mode_mask: or'ed mask of BIT(%DRM_MODE_SCALE_\*).
994 * This is used to add support for scaling mode to atomic drivers.
995 * The scaling mode will be set to &drm_connector_state.picture_aspect_ratio
996 * and can be used from &drm_connector_helper_funcs->atomic_check for validation.
998 * This is the atomic version of drm_mode_create_scaling_mode_property().
1001 * Zero on success, negative errno on failure.
1003 int drm_connector_attach_scaling_mode_property(struct drm_connector
*connector
,
1004 u32 scaling_mode_mask
)
1006 struct drm_device
*dev
= connector
->dev
;
1007 struct drm_property
*scaling_mode_property
;
1009 const unsigned valid_scaling_mode_mask
=
1010 (1U << ARRAY_SIZE(drm_scaling_mode_enum_list
)) - 1;
1012 if (WARN_ON(hweight32(scaling_mode_mask
) < 2 ||
1013 scaling_mode_mask
& ~valid_scaling_mode_mask
))
1016 scaling_mode_property
=
1017 drm_property_create(dev
, DRM_MODE_PROP_ENUM
, "scaling mode",
1018 hweight32(scaling_mode_mask
));
1020 if (!scaling_mode_property
)
1023 for (i
= 0; i
< ARRAY_SIZE(drm_scaling_mode_enum_list
); i
++) {
1026 if (!(BIT(i
) & scaling_mode_mask
))
1029 ret
= drm_property_add_enum(scaling_mode_property
, j
++,
1030 drm_scaling_mode_enum_list
[i
].type
,
1031 drm_scaling_mode_enum_list
[i
].name
);
1034 drm_property_destroy(dev
, scaling_mode_property
);
1040 drm_object_attach_property(&connector
->base
,
1041 scaling_mode_property
, 0);
1043 connector
->scaling_mode_property
= scaling_mode_property
;
1047 EXPORT_SYMBOL(drm_connector_attach_scaling_mode_property
);
1050 * drm_mode_create_aspect_ratio_property - create aspect ratio property
1053 * Called by a driver the first time it's needed, must be attached to desired
1057 * Zero on success, negative errno on failure.
1059 int drm_mode_create_aspect_ratio_property(struct drm_device
*dev
)
1061 if (dev
->mode_config
.aspect_ratio_property
)
1064 dev
->mode_config
.aspect_ratio_property
=
1065 drm_property_create_enum(dev
, 0, "aspect ratio",
1066 drm_aspect_ratio_enum_list
,
1067 ARRAY_SIZE(drm_aspect_ratio_enum_list
));
1069 if (dev
->mode_config
.aspect_ratio_property
== NULL
)
1074 EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property
);
1077 * drm_mode_create_suggested_offset_properties - create suggests offset properties
1080 * Create the the suggested x/y offset property for connectors.
1082 int drm_mode_create_suggested_offset_properties(struct drm_device
*dev
)
1084 if (dev
->mode_config
.suggested_x_property
&& dev
->mode_config
.suggested_y_property
)
1087 dev
->mode_config
.suggested_x_property
=
1088 drm_property_create_range(dev
, DRM_MODE_PROP_IMMUTABLE
, "suggested X", 0, 0xffffffff);
1090 dev
->mode_config
.suggested_y_property
=
1091 drm_property_create_range(dev
, DRM_MODE_PROP_IMMUTABLE
, "suggested Y", 0, 0xffffffff);
1093 if (dev
->mode_config
.suggested_x_property
== NULL
||
1094 dev
->mode_config
.suggested_y_property
== NULL
)
1098 EXPORT_SYMBOL(drm_mode_create_suggested_offset_properties
);
1101 * drm_mode_connector_set_path_property - set tile property on connector
1102 * @connector: connector to set property on.
1103 * @path: path to use for property; must not be NULL.
1105 * This creates a property to expose to userspace to specify a
1106 * connector path. This is mainly used for DisplayPort MST where
1107 * connectors have a topology and we want to allow userspace to give
1108 * them more meaningful names.
1111 * Zero on success, negative errno on failure.
1113 int drm_mode_connector_set_path_property(struct drm_connector
*connector
,
1116 struct drm_device
*dev
= connector
->dev
;
1119 ret
= drm_property_replace_global_blob(dev
,
1120 &connector
->path_blob_ptr
,
1124 dev
->mode_config
.path_property
);
1127 EXPORT_SYMBOL(drm_mode_connector_set_path_property
);
1130 * drm_mode_connector_set_tile_property - set tile property on connector
1131 * @connector: connector to set property on.
1133 * This looks up the tile information for a connector, and creates a
1134 * property for userspace to parse if it exists. The property is of
1135 * the form of 8 integers using ':' as a separator.
1138 * Zero on success, errno on failure.
1140 int drm_mode_connector_set_tile_property(struct drm_connector
*connector
)
1142 struct drm_device
*dev
= connector
->dev
;
1146 if (!connector
->has_tile
) {
1147 ret
= drm_property_replace_global_blob(dev
,
1148 &connector
->tile_blob_ptr
,
1152 dev
->mode_config
.tile_property
);
1156 snprintf(tile
, 256, "%d:%d:%d:%d:%d:%d:%d:%d",
1157 connector
->tile_group
->id
, connector
->tile_is_single_monitor
,
1158 connector
->num_h_tile
, connector
->num_v_tile
,
1159 connector
->tile_h_loc
, connector
->tile_v_loc
,
1160 connector
->tile_h_size
, connector
->tile_v_size
);
1162 ret
= drm_property_replace_global_blob(dev
,
1163 &connector
->tile_blob_ptr
,
1167 dev
->mode_config
.tile_property
);
1170 EXPORT_SYMBOL(drm_mode_connector_set_tile_property
);
1173 * drm_mode_connector_update_edid_property - update the edid property of a connector
1174 * @connector: drm connector
1175 * @edid: new value of the edid property
1177 * This function creates a new blob modeset object and assigns its id to the
1178 * connector's edid property.
1181 * Zero on success, negative errno on failure.
1183 int drm_mode_connector_update_edid_property(struct drm_connector
*connector
,
1184 const struct edid
*edid
)
1186 struct drm_device
*dev
= connector
->dev
;
1190 /* ignore requests to set edid when overridden */
1191 if (connector
->override_edid
)
1195 size
= EDID_LENGTH
* (1 + edid
->extensions
);
1197 ret
= drm_property_replace_global_blob(dev
,
1198 &connector
->edid_blob_ptr
,
1202 dev
->mode_config
.edid_property
);
1205 EXPORT_SYMBOL(drm_mode_connector_update_edid_property
);
1208 * drm_mode_connector_set_link_status_property - Set link status property of a connector
1209 * @connector: drm connector
1210 * @link_status: new value of link status property (0: Good, 1: Bad)
1212 * In usual working scenario, this link status property will always be set to
1213 * "GOOD". If something fails during or after a mode set, the kernel driver
1214 * may set this link status property to "BAD". The caller then needs to send a
1215 * hotplug uevent for userspace to re-check the valid modes through
1216 * GET_CONNECTOR_IOCTL and retry modeset.
1218 * Note: Drivers cannot rely on userspace to support this property and
1219 * issue a modeset. As such, they may choose to handle issues (like
1220 * re-training a link) without userspace's intervention.
1222 * The reason for adding this property is to handle link training failures, but
1223 * it is not limited to DP or link training. For example, if we implement
1224 * asynchronous setcrtc, this property can be used to report any failures in that.
1226 void drm_mode_connector_set_link_status_property(struct drm_connector
*connector
,
1227 uint64_t link_status
)
1229 struct drm_device
*dev
= connector
->dev
;
1231 drm_modeset_lock(&dev
->mode_config
.connection_mutex
, NULL
);
1232 connector
->state
->link_status
= link_status
;
1233 drm_modeset_unlock(&dev
->mode_config
.connection_mutex
);
1235 EXPORT_SYMBOL(drm_mode_connector_set_link_status_property
);
1237 int drm_mode_connector_set_obj_prop(struct drm_mode_object
*obj
,
1238 struct drm_property
*property
,
1242 struct drm_connector
*connector
= obj_to_connector(obj
);
1244 /* Do DPMS ourselves */
1245 if (property
== connector
->dev
->mode_config
.dpms_property
) {
1246 ret
= (*connector
->funcs
->dpms
)(connector
, (int)value
);
1247 } else if (connector
->funcs
->set_property
)
1248 ret
= connector
->funcs
->set_property(connector
, property
, value
);
1251 drm_object_property_set_value(&connector
->base
, property
, value
);
1255 int drm_mode_connector_property_set_ioctl(struct drm_device
*dev
,
1256 void *data
, struct drm_file
*file_priv
)
1258 struct drm_mode_connector_set_property
*conn_set_prop
= data
;
1259 struct drm_mode_obj_set_property obj_set_prop
= {
1260 .value
= conn_set_prop
->value
,
1261 .prop_id
= conn_set_prop
->prop_id
,
1262 .obj_id
= conn_set_prop
->connector_id
,
1263 .obj_type
= DRM_MODE_OBJECT_CONNECTOR
1266 /* It does all the locking and checking we need */
1267 return drm_mode_obj_set_property_ioctl(dev
, &obj_set_prop
, file_priv
);
1270 static struct drm_encoder
*drm_connector_get_encoder(struct drm_connector
*connector
)
1272 /* For atomic drivers only state objects are synchronously updated and
1273 * protected by modeset locks, so check those first. */
1274 if (connector
->state
)
1275 return connector
->state
->best_encoder
;
1276 return connector
->encoder
;
1279 static bool drm_mode_expose_to_userspace(const struct drm_display_mode
*mode
,
1280 const struct drm_file
*file_priv
)
1283 * If user-space hasn't configured the driver to expose the stereo 3D
1284 * modes, don't expose them.
1286 if (!file_priv
->stereo_allowed
&& drm_mode_is_stereo(mode
))
1292 int drm_mode_getconnector(struct drm_device
*dev
, void *data
,
1293 struct drm_file
*file_priv
)
1295 struct drm_mode_get_connector
*out_resp
= data
;
1296 struct drm_connector
*connector
;
1297 struct drm_encoder
*encoder
;
1298 struct drm_display_mode
*mode
;
1300 int encoders_count
= 0;
1304 struct drm_mode_modeinfo u_mode
;
1305 struct drm_mode_modeinfo __user
*mode_ptr
;
1306 uint32_t __user
*encoder_ptr
;
1308 if (!drm_core_check_feature(dev
, DRIVER_MODESET
))
1311 memset(&u_mode
, 0, sizeof(struct drm_mode_modeinfo
));
1313 connector
= drm_connector_lookup(dev
, file_priv
, out_resp
->connector_id
);
1317 for (i
= 0; i
< DRM_CONNECTOR_MAX_ENCODER
; i
++)
1318 if (connector
->encoder_ids
[i
] != 0)
1321 if ((out_resp
->count_encoders
>= encoders_count
) && encoders_count
) {
1323 encoder_ptr
= (uint32_t __user
*)(unsigned long)(out_resp
->encoders_ptr
);
1324 for (i
= 0; i
< DRM_CONNECTOR_MAX_ENCODER
; i
++) {
1325 if (connector
->encoder_ids
[i
] != 0) {
1326 if (put_user(connector
->encoder_ids
[i
],
1327 encoder_ptr
+ copied
)) {
1335 out_resp
->count_encoders
= encoders_count
;
1337 out_resp
->connector_id
= connector
->base
.id
;
1338 out_resp
->connector_type
= connector
->connector_type
;
1339 out_resp
->connector_type_id
= connector
->connector_type_id
;
1341 mutex_lock(&dev
->mode_config
.mutex
);
1342 if (out_resp
->count_modes
== 0) {
1343 connector
->funcs
->fill_modes(connector
,
1344 dev
->mode_config
.max_width
,
1345 dev
->mode_config
.max_height
);
1348 out_resp
->mm_width
= connector
->display_info
.width_mm
;
1349 out_resp
->mm_height
= connector
->display_info
.height_mm
;
1350 out_resp
->subpixel
= connector
->display_info
.subpixel_order
;
1351 out_resp
->connection
= connector
->status
;
1353 /* delayed so we get modes regardless of pre-fill_modes state */
1354 list_for_each_entry(mode
, &connector
->modes
, head
)
1355 if (drm_mode_expose_to_userspace(mode
, file_priv
))
1359 * This ioctl is called twice, once to determine how much space is
1360 * needed, and the 2nd time to fill it.
1362 if ((out_resp
->count_modes
>= mode_count
) && mode_count
) {
1364 mode_ptr
= (struct drm_mode_modeinfo __user
*)(unsigned long)out_resp
->modes_ptr
;
1365 list_for_each_entry(mode
, &connector
->modes
, head
) {
1366 if (!drm_mode_expose_to_userspace(mode
, file_priv
))
1369 drm_mode_convert_to_umode(&u_mode
, mode
);
1370 if (copy_to_user(mode_ptr
+ copied
,
1371 &u_mode
, sizeof(u_mode
))) {
1373 mutex_unlock(&dev
->mode_config
.mutex
);
1380 out_resp
->count_modes
= mode_count
;
1381 mutex_unlock(&dev
->mode_config
.mutex
);
1383 drm_modeset_lock(&dev
->mode_config
.connection_mutex
, NULL
);
1384 encoder
= drm_connector_get_encoder(connector
);
1386 out_resp
->encoder_id
= encoder
->base
.id
;
1388 out_resp
->encoder_id
= 0;
1390 /* Only grab properties after probing, to make sure EDID and other
1391 * properties reflect the latest status. */
1392 ret
= drm_mode_object_get_properties(&connector
->base
, file_priv
->atomic
,
1393 (uint32_t __user
*)(unsigned long)(out_resp
->props_ptr
),
1394 (uint64_t __user
*)(unsigned long)(out_resp
->prop_values_ptr
),
1395 &out_resp
->count_props
);
1396 drm_modeset_unlock(&dev
->mode_config
.connection_mutex
);
1399 drm_connector_put(connector
);
1408 * Tile groups are used to represent tiled monitors with a unique integer
1409 * identifier. Tiled monitors using DisplayID v1.3 have a unique 8-byte handle,
1410 * we store this in a tile group, so we have a common identifier for all tiles
1411 * in a monitor group. The property is called "TILE". Drivers can manage tile
1412 * groups using drm_mode_create_tile_group(), drm_mode_put_tile_group() and
1413 * drm_mode_get_tile_group(). But this is only needed for internal panels where
1414 * the tile group information is exposed through a non-standard way.
1417 static void drm_tile_group_free(struct kref
*kref
)
1419 struct drm_tile_group
*tg
= container_of(kref
, struct drm_tile_group
, refcount
);
1420 struct drm_device
*dev
= tg
->dev
;
1421 mutex_lock(&dev
->mode_config
.idr_mutex
);
1422 idr_remove(&dev
->mode_config
.tile_idr
, tg
->id
);
1423 mutex_unlock(&dev
->mode_config
.idr_mutex
);
1428 * drm_mode_put_tile_group - drop a reference to a tile group.
1430 * @tg: tile group to drop reference to.
1432 * drop reference to tile group and free if 0.
1434 void drm_mode_put_tile_group(struct drm_device
*dev
,
1435 struct drm_tile_group
*tg
)
1437 kref_put(&tg
->refcount
, drm_tile_group_free
);
1439 EXPORT_SYMBOL(drm_mode_put_tile_group
);
1442 * drm_mode_get_tile_group - get a reference to an existing tile group
1444 * @topology: 8-bytes unique per monitor.
1446 * Use the unique bytes to get a reference to an existing tile group.
1449 * tile group or NULL if not found.
1451 struct drm_tile_group
*drm_mode_get_tile_group(struct drm_device
*dev
,
1454 struct drm_tile_group
*tg
;
1456 mutex_lock(&dev
->mode_config
.idr_mutex
);
1457 idr_for_each_entry(&dev
->mode_config
.tile_idr
, tg
, id
) {
1458 if (!memcmp(tg
->group_data
, topology
, 8)) {
1459 if (!kref_get_unless_zero(&tg
->refcount
))
1461 mutex_unlock(&dev
->mode_config
.idr_mutex
);
1465 mutex_unlock(&dev
->mode_config
.idr_mutex
);
1468 EXPORT_SYMBOL(drm_mode_get_tile_group
);
1471 * drm_mode_create_tile_group - create a tile group from a displayid description
1473 * @topology: 8-bytes unique per monitor.
1475 * Create a tile group for the unique monitor, and get a unique
1476 * identifier for the tile group.
1479 * new tile group or error.
1481 struct drm_tile_group
*drm_mode_create_tile_group(struct drm_device
*dev
,
1484 struct drm_tile_group
*tg
;
1487 tg
= kzalloc(sizeof(*tg
), GFP_KERNEL
);
1489 return ERR_PTR(-ENOMEM
);
1491 kref_init(&tg
->refcount
);
1492 memcpy(tg
->group_data
, topology
, 8);
1495 mutex_lock(&dev
->mode_config
.idr_mutex
);
1496 ret
= idr_alloc(&dev
->mode_config
.tile_idr
, tg
, 1, 0, GFP_KERNEL
);
1504 mutex_unlock(&dev
->mode_config
.idr_mutex
);
1507 EXPORT_SYMBOL(drm_mode_create_tile_group
);