2 * Copyright (c) 2006-2009 Red Hat Inc.
3 * Copyright (c) 2006-2008 Intel Corporation
4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
6 * DRM framebuffer helper functions
8 * Permission to use, copy, modify, distribute, and sell this software and its
9 * documentation for any purpose is hereby granted without fee, provided that
10 * the above copyright notice appear in all copies and that both that copyright
11 * notice and this permission notice appear in supporting documentation, and
12 * that the name of the copyright holders not be used in advertising or
13 * publicity pertaining to distribution of the software without specific,
14 * written prior permission. The copyright holders make no representations
15 * about the suitability of this software for any purpose. It is provided "as
16 * is" without express or implied warranty.
18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32 #include <linux/kernel.h>
33 #include <linux/sysrq.h>
34 #include <linux/slab.h>
36 #include <linux/module.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_crtc_helper.h>
41 #include <drm/drm_atomic.h>
42 #include <drm/drm_atomic_helper.h>
44 static bool drm_fbdev_emulation
= true;
45 module_param_named(fbdev_emulation
, drm_fbdev_emulation
, bool, 0600);
46 MODULE_PARM_DESC(fbdev_emulation
,
47 "Enable legacy fbdev emulation [default=true]");
49 static LIST_HEAD(kernel_fb_helper_list
);
54 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
55 * mode setting driver. They can be used mostly independently from the crtc
56 * helper functions used by many drivers to implement the kernel mode setting
59 * Initialization is done as a four-step process with drm_fb_helper_prepare(),
60 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
61 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
62 * default behaviour can override the third step with their own code.
63 * Teardown is done with drm_fb_helper_fini().
65 * At runtime drivers should restore the fbdev console by calling
66 * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
67 * They should also notify the fb helper code from updates to the output
68 * configuration by calling drm_fb_helper_hotplug_event(). For easier
69 * integration with the output polling code in drm_crtc_helper.c the modeset
70 * code provides a ->output_poll_changed callback.
72 * All other functions exported by the fb helper library can be used to
73 * implement the fbdev driver interface by the driver.
75 * It is possible, though perhaps somewhat tricky, to implement race-free
76 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
77 * helper must be called first to initialize the minimum required to make
78 * hotplug detection work. Drivers also need to make sure to properly set up
79 * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
80 * it is safe to enable interrupts and start processing hotplug events. At the
81 * same time, drivers should initialize all modeset objects such as CRTCs,
82 * encoders and connectors. To finish up the fbdev helper initialization, the
83 * drm_fb_helper_init() function is called. To probe for all attached displays
84 * and set up an initial configuration using the detected hardware, drivers
85 * should call drm_fb_helper_single_add_all_connectors() followed by
86 * drm_fb_helper_initial_config().
88 * If &drm_framebuffer_funcs ->dirty is set, the
89 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
90 * accumulate changes and schedule &drm_fb_helper ->dirty_work to run right
91 * away. This worker then calls the dirty() function ensuring that it will
92 * always run in process context since the fb_*() function could be running in
93 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
94 * callback it will also schedule dirty_work with the damage collected from the
99 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
101 * @fb_helper: fbdev initialized with drm_fb_helper_init
103 * This functions adds all the available connectors for use with the given
104 * fb_helper. This is a separate step to allow drivers to freely assign
105 * connectors to the fbdev, e.g. if some are reserved for special purposes or
106 * not adequate to be used for the fbcon.
108 * This function is protected against concurrent connector hotadds/removals
109 * using drm_fb_helper_add_one_connector() and
110 * drm_fb_helper_remove_one_connector().
112 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper
*fb_helper
)
114 struct drm_device
*dev
= fb_helper
->dev
;
115 struct drm_connector
*connector
;
118 if (!drm_fbdev_emulation
)
121 mutex_lock(&dev
->mode_config
.mutex
);
122 drm_for_each_connector(connector
, dev
) {
123 ret
= drm_fb_helper_add_one_connector(fb_helper
, connector
);
128 mutex_unlock(&dev
->mode_config
.mutex
);
131 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
132 kfree(fb_helper
->connector_info
[i
]);
133 fb_helper
->connector_info
[i
] = NULL
;
135 fb_helper
->connector_count
= 0;
136 mutex_unlock(&dev
->mode_config
.mutex
);
140 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors
);
142 int drm_fb_helper_add_one_connector(struct drm_fb_helper
*fb_helper
, struct drm_connector
*connector
)
144 struct drm_fb_helper_connector
**temp
;
145 struct drm_fb_helper_connector
*fb_helper_connector
;
147 if (!drm_fbdev_emulation
)
150 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
151 if (fb_helper
->connector_count
+ 1 > fb_helper
->connector_info_alloc_count
) {
152 temp
= krealloc(fb_helper
->connector_info
, sizeof(struct drm_fb_helper_connector
*) * (fb_helper
->connector_count
+ 1), GFP_KERNEL
);
156 fb_helper
->connector_info_alloc_count
= fb_helper
->connector_count
+ 1;
157 fb_helper
->connector_info
= temp
;
161 fb_helper_connector
= kzalloc(sizeof(struct drm_fb_helper_connector
), GFP_KERNEL
);
162 if (!fb_helper_connector
)
165 drm_connector_reference(connector
);
166 fb_helper_connector
->connector
= connector
;
167 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_helper_connector
;
170 EXPORT_SYMBOL(drm_fb_helper_add_one_connector
);
172 int drm_fb_helper_remove_one_connector(struct drm_fb_helper
*fb_helper
,
173 struct drm_connector
*connector
)
175 struct drm_fb_helper_connector
*fb_helper_connector
;
178 if (!drm_fbdev_emulation
)
181 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
183 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
184 if (fb_helper
->connector_info
[i
]->connector
== connector
)
188 if (i
== fb_helper
->connector_count
)
190 fb_helper_connector
= fb_helper
->connector_info
[i
];
191 drm_connector_unreference(fb_helper_connector
->connector
);
193 for (j
= i
+ 1; j
< fb_helper
->connector_count
; j
++) {
194 fb_helper
->connector_info
[j
- 1] = fb_helper
->connector_info
[j
];
196 fb_helper
->connector_count
--;
197 kfree(fb_helper_connector
);
201 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector
);
203 static void drm_fb_helper_save_lut_atomic(struct drm_crtc
*crtc
, struct drm_fb_helper
*helper
)
205 uint16_t *r_base
, *g_base
, *b_base
;
208 if (helper
->funcs
->gamma_get
== NULL
)
211 r_base
= crtc
->gamma_store
;
212 g_base
= r_base
+ crtc
->gamma_size
;
213 b_base
= g_base
+ crtc
->gamma_size
;
215 for (i
= 0; i
< crtc
->gamma_size
; i
++)
216 helper
->funcs
->gamma_get(crtc
, &r_base
[i
], &g_base
[i
], &b_base
[i
], i
);
219 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc
*crtc
)
221 uint16_t *r_base
, *g_base
, *b_base
;
223 if (crtc
->funcs
->gamma_set
== NULL
)
226 r_base
= crtc
->gamma_store
;
227 g_base
= r_base
+ crtc
->gamma_size
;
228 b_base
= g_base
+ crtc
->gamma_size
;
230 crtc
->funcs
->gamma_set(crtc
, r_base
, g_base
, b_base
, crtc
->gamma_size
);
234 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
235 * @info: fbdev registered by the helper
237 int drm_fb_helper_debug_enter(struct fb_info
*info
)
239 struct drm_fb_helper
*helper
= info
->par
;
240 const struct drm_crtc_helper_funcs
*funcs
;
243 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
244 for (i
= 0; i
< helper
->crtc_count
; i
++) {
245 struct drm_mode_set
*mode_set
=
246 &helper
->crtc_info
[i
].mode_set
;
248 if (!mode_set
->crtc
->enabled
)
251 funcs
= mode_set
->crtc
->helper_private
;
252 drm_fb_helper_save_lut_atomic(mode_set
->crtc
, helper
);
253 funcs
->mode_set_base_atomic(mode_set
->crtc
,
257 ENTER_ATOMIC_MODE_SET
);
263 EXPORT_SYMBOL(drm_fb_helper_debug_enter
);
265 /* Find the real fb for a given fb helper CRTC */
266 static struct drm_framebuffer
*drm_mode_config_fb(struct drm_crtc
*crtc
)
268 struct drm_device
*dev
= crtc
->dev
;
271 drm_for_each_crtc(c
, dev
) {
272 if (crtc
->base
.id
== c
->base
.id
)
273 return c
->primary
->fb
;
280 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
281 * @info: fbdev registered by the helper
283 int drm_fb_helper_debug_leave(struct fb_info
*info
)
285 struct drm_fb_helper
*helper
= info
->par
;
286 struct drm_crtc
*crtc
;
287 const struct drm_crtc_helper_funcs
*funcs
;
288 struct drm_framebuffer
*fb
;
291 for (i
= 0; i
< helper
->crtc_count
; i
++) {
292 struct drm_mode_set
*mode_set
= &helper
->crtc_info
[i
].mode_set
;
293 crtc
= mode_set
->crtc
;
294 funcs
= crtc
->helper_private
;
295 fb
= drm_mode_config_fb(crtc
);
301 DRM_ERROR("no fb to restore??\n");
305 drm_fb_helper_restore_lut_atomic(mode_set
->crtc
);
306 funcs
->mode_set_base_atomic(mode_set
->crtc
, fb
, crtc
->x
,
307 crtc
->y
, LEAVE_ATOMIC_MODE_SET
);
312 EXPORT_SYMBOL(drm_fb_helper_debug_leave
);
314 static int restore_fbdev_mode_atomic(struct drm_fb_helper
*fb_helper
)
316 struct drm_device
*dev
= fb_helper
->dev
;
317 struct drm_plane
*plane
;
318 struct drm_atomic_state
*state
;
322 state
= drm_atomic_state_alloc(dev
);
326 state
->acquire_ctx
= dev
->mode_config
.acquire_ctx
;
329 drm_for_each_plane(plane
, dev
) {
330 struct drm_plane_state
*plane_state
;
332 plane_state
= drm_atomic_get_plane_state(state
, plane
);
333 if (IS_ERR(plane_state
)) {
334 ret
= PTR_ERR(plane_state
);
338 plane_state
->rotation
= BIT(DRM_ROTATE_0
);
340 plane
->old_fb
= plane
->fb
;
341 plane_mask
|= 1 << drm_plane_index(plane
);
343 /* disable non-primary: */
344 if (plane
->type
== DRM_PLANE_TYPE_PRIMARY
)
347 ret
= __drm_atomic_helper_disable_plane(plane
, plane_state
);
352 for(i
= 0; i
< fb_helper
->crtc_count
; i
++) {
353 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
355 ret
= __drm_atomic_helper_set_config(mode_set
, state
);
360 ret
= drm_atomic_commit(state
);
363 drm_atomic_clean_old_fb(dev
, plane_mask
, ret
);
369 drm_atomic_state_free(state
);
374 drm_atomic_state_clear(state
);
375 drm_atomic_legacy_backoff(state
);
380 static int restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
382 struct drm_device
*dev
= fb_helper
->dev
;
383 struct drm_plane
*plane
;
386 drm_warn_on_modeset_not_all_locked(dev
);
388 if (dev
->mode_config
.funcs
->atomic_commit
)
389 return restore_fbdev_mode_atomic(fb_helper
);
391 drm_for_each_plane(plane
, dev
) {
392 if (plane
->type
!= DRM_PLANE_TYPE_PRIMARY
)
393 drm_plane_force_disable(plane
);
395 if (dev
->mode_config
.rotation_property
) {
396 drm_mode_plane_set_obj_prop(plane
,
397 dev
->mode_config
.rotation_property
,
402 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
403 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
404 struct drm_crtc
*crtc
= mode_set
->crtc
;
407 if (crtc
->funcs
->cursor_set2
) {
408 ret
= crtc
->funcs
->cursor_set2(crtc
, NULL
, 0, 0, 0, 0, 0);
411 } else if (crtc
->funcs
->cursor_set
) {
412 ret
= crtc
->funcs
->cursor_set(crtc
, NULL
, 0, 0, 0);
417 ret
= drm_mode_set_config_internal(mode_set
);
426 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
427 * @fb_helper: fbcon to restore
429 * This should be called from driver's drm ->lastclose callback
430 * when implementing an fbcon on top of kms using this helper. This ensures that
431 * the user isn't greeted with a black screen when e.g. X dies.
434 * Zero if everything went ok, negative error code otherwise.
436 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper
*fb_helper
)
438 struct drm_device
*dev
= fb_helper
->dev
;
442 if (!drm_fbdev_emulation
)
445 drm_modeset_lock_all(dev
);
446 ret
= restore_fbdev_mode(fb_helper
);
448 do_delayed
= fb_helper
->delayed_hotplug
;
450 fb_helper
->delayed_hotplug
= false;
451 drm_modeset_unlock_all(dev
);
454 drm_fb_helper_hotplug_event(fb_helper
);
457 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked
);
459 static bool drm_fb_helper_is_bound(struct drm_fb_helper
*fb_helper
)
461 struct drm_device
*dev
= fb_helper
->dev
;
462 struct drm_crtc
*crtc
;
463 int bound
= 0, crtcs_bound
= 0;
465 /* Sometimes user space wants everything disabled, so don't steal the
466 * display if there's a master. */
467 if (READ_ONCE(dev
->master
))
470 drm_for_each_crtc(crtc
, dev
) {
471 if (crtc
->primary
->fb
)
473 if (crtc
->primary
->fb
== fb_helper
->fb
)
477 if (bound
< crtcs_bound
)
483 #ifdef CONFIG_MAGIC_SYSRQ
485 * restore fbcon display for all kms driver's using this helper, used for sysrq
486 * and panic handling.
488 static bool drm_fb_helper_force_kernel_mode(void)
490 bool ret
, error
= false;
491 struct drm_fb_helper
*helper
;
493 if (list_empty(&kernel_fb_helper_list
))
496 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
497 struct drm_device
*dev
= helper
->dev
;
499 if (dev
->switch_power_state
== DRM_SWITCH_POWER_OFF
)
502 drm_modeset_lock_all(dev
);
503 ret
= restore_fbdev_mode(helper
);
506 drm_modeset_unlock_all(dev
);
511 static void drm_fb_helper_restore_work_fn(struct work_struct
*ignored
)
514 ret
= drm_fb_helper_force_kernel_mode();
516 DRM_ERROR("Failed to restore crtc configuration\n");
518 static DECLARE_WORK(drm_fb_helper_restore_work
, drm_fb_helper_restore_work_fn
);
520 static void drm_fb_helper_sysrq(int dummy1
)
522 schedule_work(&drm_fb_helper_restore_work
);
525 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
526 .handler
= drm_fb_helper_sysrq
,
527 .help_msg
= "force-fb(V)",
528 .action_msg
= "Restore framebuffer console",
531 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= { };
534 static void drm_fb_helper_dpms(struct fb_info
*info
, int dpms_mode
)
536 struct drm_fb_helper
*fb_helper
= info
->par
;
537 struct drm_device
*dev
= fb_helper
->dev
;
538 struct drm_crtc
*crtc
;
539 struct drm_connector
*connector
;
543 * For each CRTC in this fb, turn the connectors on/off.
545 drm_modeset_lock_all(dev
);
546 if (!drm_fb_helper_is_bound(fb_helper
)) {
547 drm_modeset_unlock_all(dev
);
551 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
552 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
557 /* Walk the connectors & encoders on this fb turning them on/off */
558 for (j
= 0; j
< fb_helper
->connector_count
; j
++) {
559 connector
= fb_helper
->connector_info
[j
]->connector
;
560 connector
->funcs
->dpms(connector
, dpms_mode
);
561 drm_object_property_set_value(&connector
->base
,
562 dev
->mode_config
.dpms_property
, dpms_mode
);
565 drm_modeset_unlock_all(dev
);
569 * drm_fb_helper_blank - implementation for ->fb_blank
570 * @blank: desired blanking state
571 * @info: fbdev registered by the helper
573 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
575 if (oops_in_progress
)
579 /* Display: On; HSync: On, VSync: On */
580 case FB_BLANK_UNBLANK
:
581 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
583 /* Display: Off; HSync: On, VSync: On */
584 case FB_BLANK_NORMAL
:
585 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
587 /* Display: Off; HSync: Off, VSync: On */
588 case FB_BLANK_HSYNC_SUSPEND
:
589 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
591 /* Display: Off; HSync: On, VSync: Off */
592 case FB_BLANK_VSYNC_SUSPEND
:
593 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
595 /* Display: Off; HSync: Off, VSync: Off */
596 case FB_BLANK_POWERDOWN
:
597 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
602 EXPORT_SYMBOL(drm_fb_helper_blank
);
604 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
608 for (i
= 0; i
< helper
->connector_count
; i
++) {
609 drm_connector_unreference(helper
->connector_info
[i
]->connector
);
610 kfree(helper
->connector_info
[i
]);
612 kfree(helper
->connector_info
);
613 for (i
= 0; i
< helper
->crtc_count
; i
++) {
614 kfree(helper
->crtc_info
[i
].mode_set
.connectors
);
615 if (helper
->crtc_info
[i
].mode_set
.mode
)
616 drm_mode_destroy(helper
->dev
, helper
->crtc_info
[i
].mode_set
.mode
);
618 kfree(helper
->crtc_info
);
621 static void drm_fb_helper_dirty_work(struct work_struct
*work
)
623 struct drm_fb_helper
*helper
= container_of(work
, struct drm_fb_helper
,
625 struct drm_clip_rect
*clip
= &helper
->dirty_clip
;
626 struct drm_clip_rect clip_copy
;
629 spin_lock_irqsave(&helper
->dirty_lock
, flags
);
631 clip
->x1
= clip
->y1
= ~0;
632 clip
->x2
= clip
->y2
= 0;
633 spin_unlock_irqrestore(&helper
->dirty_lock
, flags
);
635 helper
->fb
->funcs
->dirty(helper
->fb
, NULL
, 0, 0, &clip_copy
, 1);
639 * drm_fb_helper_prepare - setup a drm_fb_helper structure
641 * @helper: driver-allocated fbdev helper structure to set up
642 * @funcs: pointer to structure of functions associate with this helper
644 * Sets up the bare minimum to make the framebuffer helper usable. This is
645 * useful to implement race-free initialization of the polling helpers.
647 void drm_fb_helper_prepare(struct drm_device
*dev
, struct drm_fb_helper
*helper
,
648 const struct drm_fb_helper_funcs
*funcs
)
650 INIT_LIST_HEAD(&helper
->kernel_fb_list
);
651 spin_lock_init(&helper
->dirty_lock
);
652 INIT_WORK(&helper
->dirty_work
, drm_fb_helper_dirty_work
);
653 helper
->dirty_clip
.x1
= helper
->dirty_clip
.y1
= ~0;
654 helper
->funcs
= funcs
;
657 EXPORT_SYMBOL(drm_fb_helper_prepare
);
660 * drm_fb_helper_init - initialize a drm_fb_helper structure
662 * @fb_helper: driver-allocated fbdev helper structure to initialize
663 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
664 * @max_conn_count: max connector count
666 * This allocates the structures for the fbdev helper with the given limits.
667 * Note that this won't yet touch the hardware (through the driver interfaces)
668 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
669 * to allow driver writes more control over the exact init sequence.
671 * Drivers must call drm_fb_helper_prepare() before calling this function.
674 * Zero if everything went ok, nonzero otherwise.
676 int drm_fb_helper_init(struct drm_device
*dev
,
677 struct drm_fb_helper
*fb_helper
,
678 int crtc_count
, int max_conn_count
)
680 struct drm_crtc
*crtc
;
683 if (!drm_fbdev_emulation
)
689 fb_helper
->crtc_info
= kcalloc(crtc_count
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
690 if (!fb_helper
->crtc_info
)
693 fb_helper
->crtc_count
= crtc_count
;
694 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
695 if (!fb_helper
->connector_info
) {
696 kfree(fb_helper
->crtc_info
);
699 fb_helper
->connector_info_alloc_count
= dev
->mode_config
.num_connector
;
700 fb_helper
->connector_count
= 0;
702 for (i
= 0; i
< crtc_count
; i
++) {
703 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
704 kcalloc(max_conn_count
,
705 sizeof(struct drm_connector
*),
708 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
710 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
714 drm_for_each_crtc(crtc
, dev
) {
715 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
721 drm_fb_helper_crtc_free(fb_helper
);
724 EXPORT_SYMBOL(drm_fb_helper_init
);
727 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
728 * @fb_helper: driver-allocated fbdev helper
730 * A helper to alloc fb_info and the members cmap and apertures. Called
731 * by the driver within the fb_probe fb_helper callback function.
734 * fb_info pointer if things went okay, pointer containing error code
737 struct fb_info
*drm_fb_helper_alloc_fbi(struct drm_fb_helper
*fb_helper
)
739 struct device
*dev
= fb_helper
->dev
->dev
;
740 struct fb_info
*info
;
743 info
= framebuffer_alloc(0, dev
);
745 return ERR_PTR(-ENOMEM
);
747 ret
= fb_alloc_cmap(&info
->cmap
, 256, 0);
751 info
->apertures
= alloc_apertures(1);
752 if (!info
->apertures
) {
757 fb_helper
->fbdev
= info
;
762 fb_dealloc_cmap(&info
->cmap
);
764 framebuffer_release(info
);
767 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi
);
770 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
771 * @fb_helper: driver-allocated fbdev helper
773 * A wrapper around unregister_framebuffer, to release the fb_info
776 void drm_fb_helper_unregister_fbi(struct drm_fb_helper
*fb_helper
)
778 if (fb_helper
&& fb_helper
->fbdev
)
779 unregister_framebuffer(fb_helper
->fbdev
);
781 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi
);
784 * drm_fb_helper_release_fbi - dealloc fb_info and its members
785 * @fb_helper: driver-allocated fbdev helper
787 * A helper to free memory taken by fb_info and the members cmap and
790 void drm_fb_helper_release_fbi(struct drm_fb_helper
*fb_helper
)
793 struct fb_info
*info
= fb_helper
->fbdev
;
797 fb_dealloc_cmap(&info
->cmap
);
798 framebuffer_release(info
);
801 fb_helper
->fbdev
= NULL
;
804 EXPORT_SYMBOL(drm_fb_helper_release_fbi
);
806 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
808 if (!drm_fbdev_emulation
)
811 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
812 list_del(&fb_helper
->kernel_fb_list
);
813 if (list_empty(&kernel_fb_helper_list
)) {
814 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
818 drm_fb_helper_crtc_free(fb_helper
);
821 EXPORT_SYMBOL(drm_fb_helper_fini
);
824 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
825 * @fb_helper: driver-allocated fbdev helper
827 * A wrapper around unlink_framebuffer implemented by fbdev core
829 void drm_fb_helper_unlink_fbi(struct drm_fb_helper
*fb_helper
)
831 if (fb_helper
&& fb_helper
->fbdev
)
832 unlink_framebuffer(fb_helper
->fbdev
);
834 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi
);
836 static void drm_fb_helper_dirty(struct fb_info
*info
, u32 x
, u32 y
,
837 u32 width
, u32 height
)
839 struct drm_fb_helper
*helper
= info
->par
;
840 struct drm_clip_rect
*clip
= &helper
->dirty_clip
;
843 if (!helper
->fb
->funcs
->dirty
)
846 spin_lock_irqsave(&helper
->dirty_lock
, flags
);
847 clip
->x1
= min_t(u32
, clip
->x1
, x
);
848 clip
->y1
= min_t(u32
, clip
->y1
, y
);
849 clip
->x2
= max_t(u32
, clip
->x2
, x
+ width
);
850 clip
->y2
= max_t(u32
, clip
->y2
, y
+ height
);
851 spin_unlock_irqrestore(&helper
->dirty_lock
, flags
);
853 schedule_work(&helper
->dirty_work
);
857 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
858 * @info: fb_info struct pointer
859 * @pagelist: list of dirty mmap framebuffer pages
861 * This function is used as the &fb_deferred_io ->deferred_io
862 * callback function for flushing the fbdev mmap writes.
864 void drm_fb_helper_deferred_io(struct fb_info
*info
,
865 struct list_head
*pagelist
)
867 unsigned long start
, end
, min
, max
;
873 list_for_each_entry(page
, pagelist
, lru
) {
874 start
= page
->index
<< PAGE_SHIFT
;
875 end
= start
+ PAGE_SIZE
- 1;
876 min
= min(min
, start
);
881 y1
= min
/ info
->fix
.line_length
;
882 y2
= min_t(u32
, DIV_ROUND_UP(max
, info
->fix
.line_length
),
884 drm_fb_helper_dirty(info
, 0, y1
, info
->var
.xres
, y2
- y1
);
887 EXPORT_SYMBOL(drm_fb_helper_deferred_io
);
890 * drm_fb_helper_sys_read - wrapper around fb_sys_read
891 * @info: fb_info struct pointer
892 * @buf: userspace buffer to read from framebuffer memory
893 * @count: number of bytes to read from framebuffer memory
894 * @ppos: read offset within framebuffer memory
896 * A wrapper around fb_sys_read implemented by fbdev core
898 ssize_t
drm_fb_helper_sys_read(struct fb_info
*info
, char __user
*buf
,
899 size_t count
, loff_t
*ppos
)
901 return fb_sys_read(info
, buf
, count
, ppos
);
903 EXPORT_SYMBOL(drm_fb_helper_sys_read
);
906 * drm_fb_helper_sys_write - wrapper around fb_sys_write
907 * @info: fb_info struct pointer
908 * @buf: userspace buffer to write to framebuffer memory
909 * @count: number of bytes to write to framebuffer memory
910 * @ppos: write offset within framebuffer memory
912 * A wrapper around fb_sys_write implemented by fbdev core
914 ssize_t
drm_fb_helper_sys_write(struct fb_info
*info
, const char __user
*buf
,
915 size_t count
, loff_t
*ppos
)
919 ret
= fb_sys_write(info
, buf
, count
, ppos
);
921 drm_fb_helper_dirty(info
, 0, 0, info
->var
.xres
,
926 EXPORT_SYMBOL(drm_fb_helper_sys_write
);
929 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
930 * @info: fbdev registered by the helper
931 * @rect: info about rectangle to fill
933 * A wrapper around sys_fillrect implemented by fbdev core
935 void drm_fb_helper_sys_fillrect(struct fb_info
*info
,
936 const struct fb_fillrect
*rect
)
938 sys_fillrect(info
, rect
);
939 drm_fb_helper_dirty(info
, rect
->dx
, rect
->dy
,
940 rect
->width
, rect
->height
);
942 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect
);
945 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
946 * @info: fbdev registered by the helper
947 * @area: info about area to copy
949 * A wrapper around sys_copyarea implemented by fbdev core
951 void drm_fb_helper_sys_copyarea(struct fb_info
*info
,
952 const struct fb_copyarea
*area
)
954 sys_copyarea(info
, area
);
955 drm_fb_helper_dirty(info
, area
->dx
, area
->dy
,
956 area
->width
, area
->height
);
958 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea
);
961 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
962 * @info: fbdev registered by the helper
963 * @image: info about image to blit
965 * A wrapper around sys_imageblit implemented by fbdev core
967 void drm_fb_helper_sys_imageblit(struct fb_info
*info
,
968 const struct fb_image
*image
)
970 sys_imageblit(info
, image
);
971 drm_fb_helper_dirty(info
, image
->dx
, image
->dy
,
972 image
->width
, image
->height
);
974 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit
);
977 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
978 * @info: fbdev registered by the helper
979 * @rect: info about rectangle to fill
981 * A wrapper around cfb_imageblit implemented by fbdev core
983 void drm_fb_helper_cfb_fillrect(struct fb_info
*info
,
984 const struct fb_fillrect
*rect
)
986 cfb_fillrect(info
, rect
);
987 drm_fb_helper_dirty(info
, rect
->dx
, rect
->dy
,
988 rect
->width
, rect
->height
);
990 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect
);
993 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
994 * @info: fbdev registered by the helper
995 * @area: info about area to copy
997 * A wrapper around cfb_copyarea implemented by fbdev core
999 void drm_fb_helper_cfb_copyarea(struct fb_info
*info
,
1000 const struct fb_copyarea
*area
)
1002 cfb_copyarea(info
, area
);
1003 drm_fb_helper_dirty(info
, area
->dx
, area
->dy
,
1004 area
->width
, area
->height
);
1006 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea
);
1009 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1010 * @info: fbdev registered by the helper
1011 * @image: info about image to blit
1013 * A wrapper around cfb_imageblit implemented by fbdev core
1015 void drm_fb_helper_cfb_imageblit(struct fb_info
*info
,
1016 const struct fb_image
*image
)
1018 cfb_imageblit(info
, image
);
1019 drm_fb_helper_dirty(info
, image
->dx
, image
->dy
,
1020 image
->width
, image
->height
);
1022 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit
);
1025 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1026 * @fb_helper: driver-allocated fbdev helper
1027 * @state: desired state, zero to resume, non-zero to suspend
1029 * A wrapper around fb_set_suspend implemented by fbdev core
1031 void drm_fb_helper_set_suspend(struct drm_fb_helper
*fb_helper
, int state
)
1033 if (fb_helper
&& fb_helper
->fbdev
)
1034 fb_set_suspend(fb_helper
->fbdev
, state
);
1036 EXPORT_SYMBOL(drm_fb_helper_set_suspend
);
1038 static int setcolreg(struct drm_crtc
*crtc
, u16 red
, u16 green
,
1039 u16 blue
, u16 regno
, struct fb_info
*info
)
1041 struct drm_fb_helper
*fb_helper
= info
->par
;
1042 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1044 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
) {
1047 /* place color in psuedopalette */
1050 palette
= (u32
*)info
->pseudo_palette
;
1051 red
>>= (16 - info
->var
.red
.length
);
1052 green
>>= (16 - info
->var
.green
.length
);
1053 blue
>>= (16 - info
->var
.blue
.length
);
1054 value
= (red
<< info
->var
.red
.offset
) |
1055 (green
<< info
->var
.green
.offset
) |
1056 (blue
<< info
->var
.blue
.offset
);
1057 if (info
->var
.transp
.length
> 0) {
1058 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
1059 mask
<<= info
->var
.transp
.offset
;
1062 palette
[regno
] = value
;
1067 * The driver really shouldn't advertise pseudo/directcolor
1068 * visuals if it can't deal with the palette.
1070 if (WARN_ON(!fb_helper
->funcs
->gamma_set
||
1071 !fb_helper
->funcs
->gamma_get
))
1074 WARN_ON(fb
->bits_per_pixel
!= 8);
1076 fb_helper
->funcs
->gamma_set(crtc
, red
, green
, blue
, regno
);
1082 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
1083 * @cmap: cmap to set
1084 * @info: fbdev registered by the helper
1086 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
1088 struct drm_fb_helper
*fb_helper
= info
->par
;
1089 struct drm_device
*dev
= fb_helper
->dev
;
1090 const struct drm_crtc_helper_funcs
*crtc_funcs
;
1091 u16
*red
, *green
, *blue
, *transp
;
1092 struct drm_crtc
*crtc
;
1096 if (oops_in_progress
)
1099 drm_modeset_lock_all(dev
);
1100 if (!drm_fb_helper_is_bound(fb_helper
)) {
1101 drm_modeset_unlock_all(dev
);
1105 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1106 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
1107 crtc_funcs
= crtc
->helper_private
;
1110 green
= cmap
->green
;
1112 transp
= cmap
->transp
;
1113 start
= cmap
->start
;
1115 for (j
= 0; j
< cmap
->len
; j
++) {
1116 u16 hred
, hgreen
, hblue
, htransp
= 0xffff;
1123 htransp
= *transp
++;
1125 rc
= setcolreg(crtc
, hred
, hgreen
, hblue
, start
++, info
);
1129 if (crtc_funcs
->load_lut
)
1130 crtc_funcs
->load_lut(crtc
);
1133 drm_modeset_unlock_all(dev
);
1136 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
1139 * drm_fb_helper_check_var - implementation for ->fb_check_var
1140 * @var: screeninfo to check
1141 * @info: fbdev registered by the helper
1143 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
1144 struct fb_info
*info
)
1146 struct drm_fb_helper
*fb_helper
= info
->par
;
1147 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1150 if (var
->pixclock
!= 0 || in_dbg_master())
1153 /* Need to resize the fb object !!! */
1154 if (var
->bits_per_pixel
> fb
->bits_per_pixel
||
1155 var
->xres
> fb
->width
|| var
->yres
> fb
->height
||
1156 var
->xres_virtual
> fb
->width
|| var
->yres_virtual
> fb
->height
) {
1157 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1158 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1159 var
->xres
, var
->yres
, var
->bits_per_pixel
,
1160 var
->xres_virtual
, var
->yres_virtual
,
1161 fb
->width
, fb
->height
, fb
->bits_per_pixel
);
1165 switch (var
->bits_per_pixel
) {
1167 depth
= (var
->green
.length
== 6) ? 16 : 15;
1170 depth
= (var
->transp
.length
> 0) ? 32 : 24;
1173 depth
= var
->bits_per_pixel
;
1179 var
->red
.offset
= 0;
1180 var
->green
.offset
= 0;
1181 var
->blue
.offset
= 0;
1182 var
->red
.length
= 8;
1183 var
->green
.length
= 8;
1184 var
->blue
.length
= 8;
1185 var
->transp
.length
= 0;
1186 var
->transp
.offset
= 0;
1189 var
->red
.offset
= 10;
1190 var
->green
.offset
= 5;
1191 var
->blue
.offset
= 0;
1192 var
->red
.length
= 5;
1193 var
->green
.length
= 5;
1194 var
->blue
.length
= 5;
1195 var
->transp
.length
= 1;
1196 var
->transp
.offset
= 15;
1199 var
->red
.offset
= 11;
1200 var
->green
.offset
= 5;
1201 var
->blue
.offset
= 0;
1202 var
->red
.length
= 5;
1203 var
->green
.length
= 6;
1204 var
->blue
.length
= 5;
1205 var
->transp
.length
= 0;
1206 var
->transp
.offset
= 0;
1209 var
->red
.offset
= 16;
1210 var
->green
.offset
= 8;
1211 var
->blue
.offset
= 0;
1212 var
->red
.length
= 8;
1213 var
->green
.length
= 8;
1214 var
->blue
.length
= 8;
1215 var
->transp
.length
= 0;
1216 var
->transp
.offset
= 0;
1219 var
->red
.offset
= 16;
1220 var
->green
.offset
= 8;
1221 var
->blue
.offset
= 0;
1222 var
->red
.length
= 8;
1223 var
->green
.length
= 8;
1224 var
->blue
.length
= 8;
1225 var
->transp
.length
= 8;
1226 var
->transp
.offset
= 24;
1233 EXPORT_SYMBOL(drm_fb_helper_check_var
);
1236 * drm_fb_helper_set_par - implementation for ->fb_set_par
1237 * @info: fbdev registered by the helper
1239 * This will let fbcon do the mode init and is called at initialization time by
1240 * the fbdev core when registering the driver, and later on through the hotplug
1243 int drm_fb_helper_set_par(struct fb_info
*info
)
1245 struct drm_fb_helper
*fb_helper
= info
->par
;
1246 struct fb_var_screeninfo
*var
= &info
->var
;
1248 if (oops_in_progress
)
1251 if (var
->pixclock
!= 0) {
1252 DRM_ERROR("PIXEL CLOCK SET\n");
1256 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper
);
1260 EXPORT_SYMBOL(drm_fb_helper_set_par
);
1262 static int pan_display_atomic(struct fb_var_screeninfo
*var
,
1263 struct fb_info
*info
)
1265 struct drm_fb_helper
*fb_helper
= info
->par
;
1266 struct drm_device
*dev
= fb_helper
->dev
;
1267 struct drm_atomic_state
*state
;
1268 struct drm_plane
*plane
;
1270 unsigned plane_mask
;
1272 state
= drm_atomic_state_alloc(dev
);
1276 state
->acquire_ctx
= dev
->mode_config
.acquire_ctx
;
1279 for(i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1280 struct drm_mode_set
*mode_set
;
1282 mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
1284 mode_set
->x
= var
->xoffset
;
1285 mode_set
->y
= var
->yoffset
;
1287 ret
= __drm_atomic_helper_set_config(mode_set
, state
);
1291 plane
= mode_set
->crtc
->primary
;
1292 plane_mask
|= (1 << drm_plane_index(plane
));
1293 plane
->old_fb
= plane
->fb
;
1296 ret
= drm_atomic_commit(state
);
1300 info
->var
.xoffset
= var
->xoffset
;
1301 info
->var
.yoffset
= var
->yoffset
;
1305 drm_atomic_clean_old_fb(dev
, plane_mask
, ret
);
1307 if (ret
== -EDEADLK
)
1311 drm_atomic_state_free(state
);
1316 drm_atomic_state_clear(state
);
1317 drm_atomic_legacy_backoff(state
);
1323 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1324 * @var: updated screen information
1325 * @info: fbdev registered by the helper
1327 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
1328 struct fb_info
*info
)
1330 struct drm_fb_helper
*fb_helper
= info
->par
;
1331 struct drm_device
*dev
= fb_helper
->dev
;
1332 struct drm_mode_set
*modeset
;
1336 if (oops_in_progress
)
1339 drm_modeset_lock_all(dev
);
1340 if (!drm_fb_helper_is_bound(fb_helper
)) {
1341 drm_modeset_unlock_all(dev
);
1345 if (dev
->mode_config
.funcs
->atomic_commit
) {
1346 ret
= pan_display_atomic(var
, info
);
1350 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1351 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1353 modeset
->x
= var
->xoffset
;
1354 modeset
->y
= var
->yoffset
;
1356 if (modeset
->num_connectors
) {
1357 ret
= drm_mode_set_config_internal(modeset
);
1359 info
->var
.xoffset
= var
->xoffset
;
1360 info
->var
.yoffset
= var
->yoffset
;
1365 drm_modeset_unlock_all(dev
);
1368 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
1371 * Allocates the backing storage and sets up the fbdev info structure through
1372 * the ->fb_probe callback and then registers the fbdev and sets up the panic
1375 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
1381 struct fb_info
*info
;
1382 struct drm_fb_helper_surface_size sizes
;
1385 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
1386 sizes
.surface_depth
= 24;
1387 sizes
.surface_bpp
= 32;
1388 sizes
.fb_width
= (unsigned)-1;
1389 sizes
.fb_height
= (unsigned)-1;
1391 /* if driver picks 8 or 16 by default use that
1392 for both depth/bpp */
1393 if (preferred_bpp
!= sizes
.surface_bpp
)
1394 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
1396 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1397 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1398 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
1399 struct drm_cmdline_mode
*cmdline_mode
;
1401 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
1403 if (cmdline_mode
->bpp_specified
) {
1404 switch (cmdline_mode
->bpp
) {
1406 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
1409 sizes
.surface_depth
= 15;
1410 sizes
.surface_bpp
= 16;
1413 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
1416 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
1419 sizes
.surface_depth
= 24;
1420 sizes
.surface_bpp
= 32;
1428 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1429 struct drm_display_mode
*desired_mode
;
1430 struct drm_mode_set
*mode_set
;
1432 /* in case of tile group, are we the last tile vert or horiz?
1433 * If no tile group you are always the last one both vertically
1436 bool lastv
= true, lasth
= true;
1438 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
1439 mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
1446 x
= fb_helper
->crtc_info
[i
].x
;
1447 y
= fb_helper
->crtc_info
[i
].y
;
1449 if (gamma_size
== 0)
1450 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
1452 sizes
.surface_width
= max_t(u32
, desired_mode
->hdisplay
+ x
, sizes
.surface_width
);
1453 sizes
.surface_height
= max_t(u32
, desired_mode
->vdisplay
+ y
, sizes
.surface_height
);
1455 for (j
= 0; j
< mode_set
->num_connectors
; j
++) {
1456 struct drm_connector
*connector
= mode_set
->connectors
[j
];
1457 if (connector
->has_tile
) {
1458 lasth
= (connector
->tile_h_loc
== (connector
->num_h_tile
- 1));
1459 lastv
= (connector
->tile_v_loc
== (connector
->num_v_tile
- 1));
1460 /* cloning to multiple tiles is just crazy-talk, so: */
1466 sizes
.fb_width
= min_t(u32
, desired_mode
->hdisplay
+ x
, sizes
.fb_width
);
1468 sizes
.fb_height
= min_t(u32
, desired_mode
->vdisplay
+ y
, sizes
.fb_height
);
1471 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
1472 /* hmm everyone went away - assume VGA cable just fell out
1473 and will come back later. */
1474 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1475 sizes
.fb_width
= sizes
.surface_width
= 1024;
1476 sizes
.fb_height
= sizes
.surface_height
= 768;
1479 /* push down into drivers */
1480 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
1484 info
= fb_helper
->fbdev
;
1487 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1488 * events, but at init time drm_setup_crtcs needs to be called before
1489 * the fb is allocated (since we need to figure out the desired size of
1490 * the fb before we can allocate it ...). Hence we need to fix things up
1493 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
1494 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
1495 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
1498 info
->var
.pixclock
= 0;
1499 if (register_framebuffer(info
) < 0)
1502 dev_info(fb_helper
->dev
->dev
, "fb%d: %s frame buffer device\n",
1503 info
->node
, info
->fix
.id
);
1505 if (list_empty(&kernel_fb_helper_list
)) {
1506 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
1509 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
1515 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1516 * @info: fbdev registered by the helper
1517 * @pitch: desired pitch
1518 * @depth: desired depth
1520 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1521 * fbdev emulations. Drivers which support acceleration methods which impose
1522 * additional constraints need to set up their own limits.
1524 * Drivers should call this (or their equivalent setup code) from their
1525 * ->fb_probe callback.
1527 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1530 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1531 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1532 FB_VISUAL_TRUECOLOR
;
1533 info
->fix
.mmio_start
= 0;
1534 info
->fix
.mmio_len
= 0;
1535 info
->fix
.type_aux
= 0;
1536 info
->fix
.xpanstep
= 1; /* doing it in hw */
1537 info
->fix
.ypanstep
= 1; /* doing it in hw */
1538 info
->fix
.ywrapstep
= 0;
1539 info
->fix
.accel
= FB_ACCEL_NONE
;
1541 info
->fix
.line_length
= pitch
;
1544 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1547 * drm_fb_helper_fill_var - initalizes variable fbdev information
1548 * @info: fbdev instance to set up
1549 * @fb_helper: fb helper instance to use as template
1550 * @fb_width: desired fb width
1551 * @fb_height: desired fb height
1553 * Sets up the variable fbdev metainformation from the given fb helper instance
1554 * and the drm framebuffer allocated in fb_helper->fb.
1556 * Drivers should call this (or their equivalent setup code) from their
1557 * ->fb_probe callback after having allocated the fbdev backing
1558 * storage framebuffer.
1560 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1561 uint32_t fb_width
, uint32_t fb_height
)
1563 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1564 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1565 info
->var
.xres_virtual
= fb
->width
;
1566 info
->var
.yres_virtual
= fb
->height
;
1567 info
->var
.bits_per_pixel
= fb
->bits_per_pixel
;
1568 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1569 info
->var
.xoffset
= 0;
1570 info
->var
.yoffset
= 0;
1571 info
->var
.activate
= FB_ACTIVATE_NOW
;
1572 info
->var
.height
= -1;
1573 info
->var
.width
= -1;
1575 switch (fb
->depth
) {
1577 info
->var
.red
.offset
= 0;
1578 info
->var
.green
.offset
= 0;
1579 info
->var
.blue
.offset
= 0;
1580 info
->var
.red
.length
= 8; /* 8bit DAC */
1581 info
->var
.green
.length
= 8;
1582 info
->var
.blue
.length
= 8;
1583 info
->var
.transp
.offset
= 0;
1584 info
->var
.transp
.length
= 0;
1587 info
->var
.red
.offset
= 10;
1588 info
->var
.green
.offset
= 5;
1589 info
->var
.blue
.offset
= 0;
1590 info
->var
.red
.length
= 5;
1591 info
->var
.green
.length
= 5;
1592 info
->var
.blue
.length
= 5;
1593 info
->var
.transp
.offset
= 15;
1594 info
->var
.transp
.length
= 1;
1597 info
->var
.red
.offset
= 11;
1598 info
->var
.green
.offset
= 5;
1599 info
->var
.blue
.offset
= 0;
1600 info
->var
.red
.length
= 5;
1601 info
->var
.green
.length
= 6;
1602 info
->var
.blue
.length
= 5;
1603 info
->var
.transp
.offset
= 0;
1606 info
->var
.red
.offset
= 16;
1607 info
->var
.green
.offset
= 8;
1608 info
->var
.blue
.offset
= 0;
1609 info
->var
.red
.length
= 8;
1610 info
->var
.green
.length
= 8;
1611 info
->var
.blue
.length
= 8;
1612 info
->var
.transp
.offset
= 0;
1613 info
->var
.transp
.length
= 0;
1616 info
->var
.red
.offset
= 16;
1617 info
->var
.green
.offset
= 8;
1618 info
->var
.blue
.offset
= 0;
1619 info
->var
.red
.length
= 8;
1620 info
->var
.green
.length
= 8;
1621 info
->var
.blue
.length
= 8;
1622 info
->var
.transp
.offset
= 24;
1623 info
->var
.transp
.length
= 8;
1629 info
->var
.xres
= fb_width
;
1630 info
->var
.yres
= fb_height
;
1632 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1634 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1638 struct drm_connector
*connector
;
1642 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1643 connector
= fb_helper
->connector_info
[i
]->connector
;
1644 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1650 struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1652 struct drm_display_mode
*mode
;
1654 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1655 if (mode
->hdisplay
> width
||
1656 mode
->vdisplay
> height
)
1658 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1663 EXPORT_SYMBOL(drm_has_preferred_mode
);
1665 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1667 return fb_connector
->connector
->cmdline_mode
.specified
;
1670 struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
,
1671 int width
, int height
)
1673 struct drm_cmdline_mode
*cmdline_mode
;
1674 struct drm_display_mode
*mode
;
1675 bool prefer_non_interlace
;
1677 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
1678 if (cmdline_mode
->specified
== false)
1681 /* attempt to find a matching mode in the list of modes
1682 * we have gotten so far, if not add a CVT mode that conforms
1684 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1687 prefer_non_interlace
= !cmdline_mode
->interlace
;
1689 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1690 /* check width/height */
1691 if (mode
->hdisplay
!= cmdline_mode
->xres
||
1692 mode
->vdisplay
!= cmdline_mode
->yres
)
1695 if (cmdline_mode
->refresh_specified
) {
1696 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
1700 if (cmdline_mode
->interlace
) {
1701 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
1703 } else if (prefer_non_interlace
) {
1704 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
1710 if (prefer_non_interlace
) {
1711 prefer_non_interlace
= false;
1716 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
1718 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
1721 EXPORT_SYMBOL(drm_pick_cmdline_mode
);
1723 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
1728 enable
= connector
->status
== connector_status_connected
;
1730 enable
= connector
->status
!= connector_status_disconnected
;
1735 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
1738 bool any_enabled
= false;
1739 struct drm_connector
*connector
;
1742 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1743 connector
= fb_helper
->connector_info
[i
]->connector
;
1744 enabled
[i
] = drm_connector_enabled(connector
, true);
1745 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
1746 enabled
[i
] ? "yes" : "no");
1747 any_enabled
|= enabled
[i
];
1753 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1754 connector
= fb_helper
->connector_info
[i
]->connector
;
1755 enabled
[i
] = drm_connector_enabled(connector
, false);
1759 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
1760 struct drm_display_mode
**modes
,
1761 struct drm_fb_offset
*offsets
,
1762 bool *enabled
, int width
, int height
)
1765 bool can_clone
= false;
1766 struct drm_fb_helper_connector
*fb_helper_conn
;
1767 struct drm_display_mode
*dmt_mode
, *mode
;
1769 /* only contemplate cloning in the single crtc case */
1770 if (fb_helper
->crtc_count
> 1)
1774 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1779 /* only contemplate cloning if more than one connector is enabled */
1783 /* check the command line or if nothing common pick 1024x768 */
1785 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1788 fb_helper_conn
= fb_helper
->connector_info
[i
];
1789 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1794 for (j
= 0; j
< i
; j
++) {
1797 if (!drm_mode_equal(modes
[j
], modes
[i
]))
1803 DRM_DEBUG_KMS("can clone using command line\n");
1807 /* try and find a 1024x768 mode on each connector */
1809 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
1811 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1816 fb_helper_conn
= fb_helper
->connector_info
[i
];
1817 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1818 if (drm_mode_equal(mode
, dmt_mode
))
1826 DRM_DEBUG_KMS("can clone using 1024x768\n");
1829 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1833 static int drm_get_tile_offsets(struct drm_fb_helper
*fb_helper
,
1834 struct drm_display_mode
**modes
,
1835 struct drm_fb_offset
*offsets
,
1837 int h_idx
, int v_idx
)
1839 struct drm_fb_helper_connector
*fb_helper_conn
;
1841 int hoffset
= 0, voffset
= 0;
1843 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1844 fb_helper_conn
= fb_helper
->connector_info
[i
];
1845 if (!fb_helper_conn
->connector
->has_tile
)
1848 if (!modes
[i
] && (h_idx
|| v_idx
)) {
1849 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i
,
1850 fb_helper_conn
->connector
->base
.id
);
1853 if (fb_helper_conn
->connector
->tile_h_loc
< h_idx
)
1854 hoffset
+= modes
[i
]->hdisplay
;
1856 if (fb_helper_conn
->connector
->tile_v_loc
< v_idx
)
1857 voffset
+= modes
[i
]->vdisplay
;
1859 offsets
[idx
].x
= hoffset
;
1860 offsets
[idx
].y
= voffset
;
1861 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset
, voffset
, h_idx
, v_idx
);
1865 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
1866 struct drm_display_mode
**modes
,
1867 struct drm_fb_offset
*offsets
,
1868 bool *enabled
, int width
, int height
)
1870 struct drm_fb_helper_connector
*fb_helper_conn
;
1872 uint64_t conn_configured
= 0, mask
;
1874 mask
= (1 << fb_helper
->connector_count
) - 1;
1876 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1877 fb_helper_conn
= fb_helper
->connector_info
[i
];
1879 if (conn_configured
& (1 << i
))
1882 if (enabled
[i
] == false) {
1883 conn_configured
|= (1 << i
);
1887 /* first pass over all the untiled connectors */
1888 if (tile_pass
== 0 && fb_helper_conn
->connector
->has_tile
)
1891 if (tile_pass
== 1) {
1892 if (fb_helper_conn
->connector
->tile_h_loc
!= 0 ||
1893 fb_helper_conn
->connector
->tile_v_loc
!= 0)
1897 if (fb_helper_conn
->connector
->tile_h_loc
!= tile_pass
-1 &&
1898 fb_helper_conn
->connector
->tile_v_loc
!= tile_pass
- 1)
1899 /* if this tile_pass doesn't cover any of the tiles - keep going */
1902 /* find the tile offsets for this pass - need
1903 to find all tiles left and above */
1904 drm_get_tile_offsets(fb_helper
, modes
, offsets
,
1905 i
, fb_helper_conn
->connector
->tile_h_loc
, fb_helper_conn
->connector
->tile_v_loc
);
1907 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1908 fb_helper_conn
->connector
->base
.id
);
1910 /* got for command line mode first */
1911 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1913 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1914 fb_helper_conn
->connector
->base
.id
, fb_helper_conn
->connector
->tile_group
? fb_helper_conn
->connector
->tile_group
->id
: 0);
1915 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
1917 /* No preferred modes, pick one off the list */
1918 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
1919 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
1922 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
1924 conn_configured
|= (1 << i
);
1927 if ((conn_configured
& mask
) != mask
) {
1934 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
1935 struct drm_fb_helper_crtc
**best_crtcs
,
1936 struct drm_display_mode
**modes
,
1937 int n
, int width
, int height
)
1940 struct drm_connector
*connector
;
1941 const struct drm_connector_helper_funcs
*connector_funcs
;
1942 struct drm_encoder
*encoder
;
1943 int my_score
, best_score
, score
;
1944 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
1945 struct drm_fb_helper_connector
*fb_helper_conn
;
1947 if (n
== fb_helper
->connector_count
)
1950 fb_helper_conn
= fb_helper
->connector_info
[n
];
1951 connector
= fb_helper_conn
->connector
;
1953 best_crtcs
[n
] = NULL
;
1954 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
1955 if (modes
[n
] == NULL
)
1958 crtcs
= kzalloc(fb_helper
->connector_count
*
1959 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1964 if (connector
->status
== connector_status_connected
)
1966 if (drm_has_cmdline_mode(fb_helper_conn
))
1968 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
1971 connector_funcs
= connector
->helper_private
;
1974 * If the DRM device implements atomic hooks and ->best_encoder() is
1975 * NULL we fallback to the default drm_atomic_helper_best_encoder()
1978 if (fb_helper
->dev
->mode_config
.funcs
->atomic_commit
&&
1979 !connector_funcs
->best_encoder
)
1980 encoder
= drm_atomic_helper_best_encoder(connector
);
1982 encoder
= connector_funcs
->best_encoder(connector
);
1987 /* select a crtc for this connector and then attempt to configure
1988 remaining connectors */
1989 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
1990 crtc
= &fb_helper
->crtc_info
[c
];
1992 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
1995 for (o
= 0; o
< n
; o
++)
1996 if (best_crtcs
[o
] == crtc
)
2000 /* ignore cloning unless only a single crtc */
2001 if (fb_helper
->crtc_count
> 1)
2004 if (!drm_mode_equal(modes
[o
], modes
[n
]))
2009 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
2010 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
2012 if (score
> best_score
) {
2014 memcpy(best_crtcs
, crtcs
,
2015 fb_helper
->connector_count
*
2016 sizeof(struct drm_fb_helper_crtc
*));
2024 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
)
2026 struct drm_device
*dev
= fb_helper
->dev
;
2027 struct drm_fb_helper_crtc
**crtcs
;
2028 struct drm_display_mode
**modes
;
2029 struct drm_fb_offset
*offsets
;
2030 struct drm_mode_set
*modeset
;
2035 DRM_DEBUG_KMS("\n");
2037 width
= dev
->mode_config
.max_width
;
2038 height
= dev
->mode_config
.max_height
;
2040 crtcs
= kcalloc(fb_helper
->connector_count
,
2041 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
2042 modes
= kcalloc(fb_helper
->connector_count
,
2043 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
2044 offsets
= kcalloc(fb_helper
->connector_count
,
2045 sizeof(struct drm_fb_offset
), GFP_KERNEL
);
2046 enabled
= kcalloc(fb_helper
->connector_count
,
2047 sizeof(bool), GFP_KERNEL
);
2048 if (!crtcs
|| !modes
|| !enabled
|| !offsets
) {
2049 DRM_ERROR("Memory allocation failed\n");
2054 drm_enable_connectors(fb_helper
, enabled
);
2056 if (!(fb_helper
->funcs
->initial_config
&&
2057 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
2059 enabled
, width
, height
))) {
2060 memset(modes
, 0, fb_helper
->connector_count
*sizeof(modes
[0]));
2061 memset(crtcs
, 0, fb_helper
->connector_count
*sizeof(crtcs
[0]));
2062 memset(offsets
, 0, fb_helper
->connector_count
*sizeof(offsets
[0]));
2064 if (!drm_target_cloned(fb_helper
, modes
, offsets
,
2065 enabled
, width
, height
) &&
2066 !drm_target_preferred(fb_helper
, modes
, offsets
,
2067 enabled
, width
, height
))
2068 DRM_ERROR("Unable to find initial modes\n");
2070 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2073 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
2076 /* need to set the modesets up here for use later */
2077 /* fill out the connector<->crtc mappings into the modesets */
2078 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
2079 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
2080 modeset
->num_connectors
= 0;
2084 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
2085 struct drm_display_mode
*mode
= modes
[i
];
2086 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
2087 struct drm_fb_offset
*offset
= &offsets
[i
];
2088 modeset
= &fb_crtc
->mode_set
;
2090 if (mode
&& fb_crtc
) {
2091 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2092 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
, offset
->x
, offset
->y
);
2093 fb_crtc
->desired_mode
= mode
;
2094 fb_crtc
->x
= offset
->x
;
2095 fb_crtc
->y
= offset
->y
;
2097 drm_mode_destroy(dev
, modeset
->mode
);
2098 modeset
->mode
= drm_mode_duplicate(dev
,
2099 fb_crtc
->desired_mode
);
2100 modeset
->connectors
[modeset
->num_connectors
++] = fb_helper
->connector_info
[i
]->connector
;
2101 modeset
->fb
= fb_helper
->fb
;
2102 modeset
->x
= offset
->x
;
2103 modeset
->y
= offset
->y
;
2107 /* Clear out any old modes if there are no more connected outputs. */
2108 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
2109 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
2110 if (modeset
->num_connectors
== 0) {
2111 BUG_ON(modeset
->fb
);
2113 drm_mode_destroy(dev
, modeset
->mode
);
2114 modeset
->mode
= NULL
;
2125 * drm_fb_helper_initial_config - setup a sane initial connector configuration
2126 * @fb_helper: fb_helper device struct
2127 * @bpp_sel: bpp value to use for the framebuffer configuration
2129 * Scans the CRTCs and connectors and tries to put together an initial setup.
2130 * At the moment, this is a cloned configuration across all heads with
2131 * a new framebuffer object as the backing store.
2133 * Note that this also registers the fbdev and so allows userspace to call into
2134 * the driver through the fbdev interfaces.
2136 * This function will call down into the ->fb_probe callback to let
2137 * the driver allocate and initialize the fbdev info structure and the drm
2138 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2139 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2140 * values for the fbdev info structure.
2144 * When you have fbcon support built-in or already loaded, this function will do
2145 * a full modeset to setup the fbdev console. Due to locking misdesign in the
2146 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2147 * console_lock. Until console_unlock is called no dmesg lines will be sent out
2148 * to consoles, not even serial console. This means when your driver crashes,
2149 * you will see absolutely nothing else but a system stuck in this function,
2150 * with no further output. Any kind of printk() you place within your own driver
2151 * or in the drm core modeset code will also never show up.
2153 * Standard debug practice is to run the fbcon setup without taking the
2154 * console_lock as a hack, to be able to see backtraces and crashes on the
2155 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2158 * The other option is to just disable fbdev emulation since very likely the
2159 * first modeset from userspace will crash in the same way, and is even easier
2160 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2161 * kernel cmdline option.
2164 * Zero if everything went ok, nonzero otherwise.
2166 int drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
2168 struct drm_device
*dev
= fb_helper
->dev
;
2171 if (!drm_fbdev_emulation
)
2174 mutex_lock(&dev
->mode_config
.mutex
);
2175 count
= drm_fb_helper_probe_connector_modes(fb_helper
,
2176 dev
->mode_config
.max_width
,
2177 dev
->mode_config
.max_height
);
2178 mutex_unlock(&dev
->mode_config
.mutex
);
2180 * we shouldn't end up with no modes here.
2183 dev_info(fb_helper
->dev
->dev
, "No connectors reported connected with modes\n");
2185 drm_setup_crtcs(fb_helper
);
2187 return drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
2189 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
2192 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2193 * probing all the outputs attached to the fb
2194 * @fb_helper: the drm_fb_helper
2196 * Scan the connectors attached to the fb_helper and try to put together a
2197 * setup after *notification of a change in output configuration.
2199 * Called at runtime, takes the mode config locks to be able to check/change the
2200 * modeset configuration. Must be run from process context (which usually means
2201 * either the output polling work or a work item launched from the driver's
2202 * hotplug interrupt).
2204 * Note that drivers may call this even before calling
2205 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2206 * for a race-free fbcon setup and will make sure that the fbdev emulation will
2207 * not miss any hotplug events.
2210 * 0 on success and a non-zero error code otherwise.
2212 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
2214 struct drm_device
*dev
= fb_helper
->dev
;
2215 u32 max_width
, max_height
;
2217 if (!drm_fbdev_emulation
)
2220 mutex_lock(&fb_helper
->dev
->mode_config
.mutex
);
2221 if (!fb_helper
->fb
|| !drm_fb_helper_is_bound(fb_helper
)) {
2222 fb_helper
->delayed_hotplug
= true;
2223 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
2226 DRM_DEBUG_KMS("\n");
2228 max_width
= fb_helper
->fb
->width
;
2229 max_height
= fb_helper
->fb
->height
;
2231 drm_fb_helper_probe_connector_modes(fb_helper
, max_width
, max_height
);
2232 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
2234 drm_modeset_lock_all(dev
);
2235 drm_setup_crtcs(fb_helper
);
2236 drm_modeset_unlock_all(dev
);
2237 drm_fb_helper_set_par(fb_helper
->fbdev
);
2241 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
2243 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2244 * but the module doesn't depend on any fb console symbols. At least
2245 * attempt to load fbcon to avoid leaving the system without a usable console.
2247 int __init
drm_fb_helper_modinit(void)
2249 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2250 const char *name
= "fbcon";
2251 struct module
*fbcon
;
2253 mutex_lock(&module_mutex
);
2254 fbcon
= find_module(name
);
2255 mutex_unlock(&module_mutex
);
2258 request_module_nowait(name
);
2262 EXPORT_SYMBOL(drm_fb_helper_modinit
);