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/console.h>
33 #include <linux/kernel.h>
34 #include <linux/sysrq.h>
35 #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 #include "drm_crtc_helper_internal.h"
46 static bool drm_fbdev_emulation
= true;
47 module_param_named(fbdev_emulation
, drm_fbdev_emulation
, bool, 0600);
48 MODULE_PARM_DESC(fbdev_emulation
,
49 "Enable legacy fbdev emulation [default=true]");
51 static LIST_HEAD(kernel_fb_helper_list
);
52 static DEFINE_MUTEX(kernel_fb_helper_lock
);
57 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
58 * mode setting driver. They can be used mostly independently from the crtc
59 * helper functions used by many drivers to implement the kernel mode setting
62 * Initialization is done as a four-step process with drm_fb_helper_prepare(),
63 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
64 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
65 * default behaviour can override the third step with their own code.
66 * Teardown is done with drm_fb_helper_fini().
68 * At runtime drivers should restore the fbdev console by calling
69 * drm_fb_helper_restore_fbdev_mode_unlocked() from their &drm_driver.lastclose
70 * callback. They should also notify the fb helper code from updates to the
71 * output configuration by calling drm_fb_helper_hotplug_event(). For easier
72 * integration with the output polling code in drm_crtc_helper.c the modeset
73 * code provides a &drm_mode_config_funcs.output_poll_changed callback.
75 * All other functions exported by the fb helper library can be used to
76 * implement the fbdev driver interface by the driver.
78 * It is possible, though perhaps somewhat tricky, to implement race-free
79 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
80 * helper must be called first to initialize the minimum required to make
81 * hotplug detection work. Drivers also need to make sure to properly set up
82 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
83 * it is safe to enable interrupts and start processing hotplug events. At the
84 * same time, drivers should initialize all modeset objects such as CRTCs,
85 * encoders and connectors. To finish up the fbdev helper initialization, the
86 * drm_fb_helper_init() function is called. To probe for all attached displays
87 * and set up an initial configuration using the detected hardware, drivers
88 * should call drm_fb_helper_single_add_all_connectors() followed by
89 * drm_fb_helper_initial_config().
91 * If &drm_framebuffer_funcs.dirty is set, the
92 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
93 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right
94 * away. This worker then calls the dirty() function ensuring that it will
95 * always run in process context since the fb_*() function could be running in
96 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
97 * callback it will also schedule dirty_work with the damage collected from the
101 #define drm_fb_helper_for_each_connector(fbh, i__) \
102 for (({ lockdep_assert_held(&(fbh)->dev->mode_config.mutex); }), \
103 i__ = 0; i__ < (fbh)->connector_count; i__++)
106 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
108 * @fb_helper: fbdev initialized with drm_fb_helper_init
110 * This functions adds all the available connectors for use with the given
111 * fb_helper. This is a separate step to allow drivers to freely assign
112 * connectors to the fbdev, e.g. if some are reserved for special purposes or
113 * not adequate to be used for the fbcon.
115 * This function is protected against concurrent connector hotadds/removals
116 * using drm_fb_helper_add_one_connector() and
117 * drm_fb_helper_remove_one_connector().
119 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper
*fb_helper
)
121 struct drm_device
*dev
= fb_helper
->dev
;
122 struct drm_connector
*connector
;
123 struct drm_connector_list_iter conn_iter
;
126 if (!drm_fbdev_emulation
)
129 mutex_lock(&dev
->mode_config
.mutex
);
130 drm_connector_list_iter_get(dev
, &conn_iter
);
131 drm_for_each_connector_iter(connector
, &conn_iter
) {
132 ret
= drm_fb_helper_add_one_connector(fb_helper
, connector
);
140 drm_fb_helper_for_each_connector(fb_helper
, i
) {
141 struct drm_fb_helper_connector
*fb_helper_connector
=
142 fb_helper
->connector_info
[i
];
144 drm_connector_unreference(fb_helper_connector
->connector
);
146 kfree(fb_helper_connector
);
147 fb_helper
->connector_info
[i
] = NULL
;
149 fb_helper
->connector_count
= 0;
151 drm_connector_list_iter_put(&conn_iter
);
152 mutex_unlock(&dev
->mode_config
.mutex
);
156 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors
);
158 int drm_fb_helper_add_one_connector(struct drm_fb_helper
*fb_helper
, struct drm_connector
*connector
)
160 struct drm_fb_helper_connector
**temp
;
161 struct drm_fb_helper_connector
*fb_helper_connector
;
163 if (!drm_fbdev_emulation
)
166 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
167 if (fb_helper
->connector_count
+ 1 > fb_helper
->connector_info_alloc_count
) {
168 temp
= krealloc(fb_helper
->connector_info
, sizeof(struct drm_fb_helper_connector
*) * (fb_helper
->connector_count
+ 1), GFP_KERNEL
);
172 fb_helper
->connector_info_alloc_count
= fb_helper
->connector_count
+ 1;
173 fb_helper
->connector_info
= temp
;
177 fb_helper_connector
= kzalloc(sizeof(struct drm_fb_helper_connector
), GFP_KERNEL
);
178 if (!fb_helper_connector
)
181 drm_connector_reference(connector
);
182 fb_helper_connector
->connector
= connector
;
183 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_helper_connector
;
186 EXPORT_SYMBOL(drm_fb_helper_add_one_connector
);
188 int drm_fb_helper_remove_one_connector(struct drm_fb_helper
*fb_helper
,
189 struct drm_connector
*connector
)
191 struct drm_fb_helper_connector
*fb_helper_connector
;
194 if (!drm_fbdev_emulation
)
197 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
199 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
200 if (fb_helper
->connector_info
[i
]->connector
== connector
)
204 if (i
== fb_helper
->connector_count
)
206 fb_helper_connector
= fb_helper
->connector_info
[i
];
207 drm_connector_unreference(fb_helper_connector
->connector
);
209 for (j
= i
+ 1; j
< fb_helper
->connector_count
; j
++) {
210 fb_helper
->connector_info
[j
- 1] = fb_helper
->connector_info
[j
];
212 fb_helper
->connector_count
--;
213 kfree(fb_helper_connector
);
217 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector
);
219 static void drm_fb_helper_save_lut_atomic(struct drm_crtc
*crtc
, struct drm_fb_helper
*helper
)
221 uint16_t *r_base
, *g_base
, *b_base
;
224 if (helper
->funcs
->gamma_get
== NULL
)
227 r_base
= crtc
->gamma_store
;
228 g_base
= r_base
+ crtc
->gamma_size
;
229 b_base
= g_base
+ crtc
->gamma_size
;
231 for (i
= 0; i
< crtc
->gamma_size
; i
++)
232 helper
->funcs
->gamma_get(crtc
, &r_base
[i
], &g_base
[i
], &b_base
[i
], i
);
235 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc
*crtc
)
237 uint16_t *r_base
, *g_base
, *b_base
;
239 if (crtc
->funcs
->gamma_set
== NULL
)
242 r_base
= crtc
->gamma_store
;
243 g_base
= r_base
+ crtc
->gamma_size
;
244 b_base
= g_base
+ crtc
->gamma_size
;
246 crtc
->funcs
->gamma_set(crtc
, r_base
, g_base
, b_base
, crtc
->gamma_size
);
250 * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
251 * @info: fbdev registered by the helper
253 int drm_fb_helper_debug_enter(struct fb_info
*info
)
255 struct drm_fb_helper
*helper
= info
->par
;
256 const struct drm_crtc_helper_funcs
*funcs
;
259 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
260 for (i
= 0; i
< helper
->crtc_count
; i
++) {
261 struct drm_mode_set
*mode_set
=
262 &helper
->crtc_info
[i
].mode_set
;
264 if (!mode_set
->crtc
->enabled
)
267 funcs
= mode_set
->crtc
->helper_private
;
268 if (funcs
->mode_set_base_atomic
== NULL
)
271 drm_fb_helper_save_lut_atomic(mode_set
->crtc
, helper
);
272 funcs
->mode_set_base_atomic(mode_set
->crtc
,
276 ENTER_ATOMIC_MODE_SET
);
282 EXPORT_SYMBOL(drm_fb_helper_debug_enter
);
284 /* Find the real fb for a given fb helper CRTC */
285 static struct drm_framebuffer
*drm_mode_config_fb(struct drm_crtc
*crtc
)
287 struct drm_device
*dev
= crtc
->dev
;
290 drm_for_each_crtc(c
, dev
) {
291 if (crtc
->base
.id
== c
->base
.id
)
292 return c
->primary
->fb
;
299 * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
300 * @info: fbdev registered by the helper
302 int drm_fb_helper_debug_leave(struct fb_info
*info
)
304 struct drm_fb_helper
*helper
= info
->par
;
305 struct drm_crtc
*crtc
;
306 const struct drm_crtc_helper_funcs
*funcs
;
307 struct drm_framebuffer
*fb
;
310 for (i
= 0; i
< helper
->crtc_count
; i
++) {
311 struct drm_mode_set
*mode_set
= &helper
->crtc_info
[i
].mode_set
;
312 crtc
= mode_set
->crtc
;
313 funcs
= crtc
->helper_private
;
314 fb
= drm_mode_config_fb(crtc
);
320 DRM_ERROR("no fb to restore??\n");
324 if (funcs
->mode_set_base_atomic
== NULL
)
327 drm_fb_helper_restore_lut_atomic(mode_set
->crtc
);
328 funcs
->mode_set_base_atomic(mode_set
->crtc
, fb
, crtc
->x
,
329 crtc
->y
, LEAVE_ATOMIC_MODE_SET
);
334 EXPORT_SYMBOL(drm_fb_helper_debug_leave
);
336 static int restore_fbdev_mode_atomic(struct drm_fb_helper
*fb_helper
)
338 struct drm_device
*dev
= fb_helper
->dev
;
339 struct drm_plane
*plane
;
340 struct drm_atomic_state
*state
;
344 state
= drm_atomic_state_alloc(dev
);
348 state
->acquire_ctx
= dev
->mode_config
.acquire_ctx
;
351 drm_for_each_plane(plane
, dev
) {
352 struct drm_plane_state
*plane_state
;
354 plane_state
= drm_atomic_get_plane_state(state
, plane
);
355 if (IS_ERR(plane_state
)) {
356 ret
= PTR_ERR(plane_state
);
360 plane_state
->rotation
= DRM_ROTATE_0
;
362 plane
->old_fb
= plane
->fb
;
363 plane_mask
|= 1 << drm_plane_index(plane
);
365 /* disable non-primary: */
366 if (plane
->type
== DRM_PLANE_TYPE_PRIMARY
)
369 ret
= __drm_atomic_helper_disable_plane(plane
, plane_state
);
374 for(i
= 0; i
< fb_helper
->crtc_count
; i
++) {
375 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
377 ret
= __drm_atomic_helper_set_config(mode_set
, state
);
382 ret
= drm_atomic_commit(state
);
385 drm_atomic_clean_old_fb(dev
, plane_mask
, ret
);
390 drm_atomic_state_put(state
);
394 drm_atomic_state_clear(state
);
395 drm_atomic_legacy_backoff(state
);
400 static int restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
402 struct drm_device
*dev
= fb_helper
->dev
;
403 struct drm_plane
*plane
;
406 drm_warn_on_modeset_not_all_locked(dev
);
408 if (drm_drv_uses_atomic_modeset(dev
))
409 return restore_fbdev_mode_atomic(fb_helper
);
411 drm_for_each_plane(plane
, dev
) {
412 if (plane
->type
!= DRM_PLANE_TYPE_PRIMARY
)
413 drm_plane_force_disable(plane
);
415 if (plane
->rotation_property
)
416 drm_mode_plane_set_obj_prop(plane
,
417 plane
->rotation_property
,
421 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
422 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
423 struct drm_crtc
*crtc
= mode_set
->crtc
;
426 if (crtc
->funcs
->cursor_set2
) {
427 ret
= crtc
->funcs
->cursor_set2(crtc
, NULL
, 0, 0, 0, 0, 0);
430 } else if (crtc
->funcs
->cursor_set
) {
431 ret
= crtc
->funcs
->cursor_set(crtc
, NULL
, 0, 0, 0);
436 ret
= drm_mode_set_config_internal(mode_set
);
445 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
446 * @fb_helper: fbcon to restore
448 * This should be called from driver's drm &drm_driver.lastclose callback
449 * when implementing an fbcon on top of kms using this helper. This ensures that
450 * the user isn't greeted with a black screen when e.g. X dies.
453 * Zero if everything went ok, negative error code otherwise.
455 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper
*fb_helper
)
457 struct drm_device
*dev
= fb_helper
->dev
;
461 if (!drm_fbdev_emulation
)
464 drm_modeset_lock_all(dev
);
465 ret
= restore_fbdev_mode(fb_helper
);
467 do_delayed
= fb_helper
->delayed_hotplug
;
469 fb_helper
->delayed_hotplug
= false;
470 drm_modeset_unlock_all(dev
);
473 drm_fb_helper_hotplug_event(fb_helper
);
476 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked
);
478 static bool drm_fb_helper_is_bound(struct drm_fb_helper
*fb_helper
)
480 struct drm_device
*dev
= fb_helper
->dev
;
481 struct drm_crtc
*crtc
;
482 int bound
= 0, crtcs_bound
= 0;
484 /* Sometimes user space wants everything disabled, so don't steal the
485 * display if there's a master. */
486 if (READ_ONCE(dev
->master
))
489 drm_for_each_crtc(crtc
, dev
) {
490 if (crtc
->primary
->fb
)
492 if (crtc
->primary
->fb
== fb_helper
->fb
)
496 if (bound
< crtcs_bound
)
502 #ifdef CONFIG_MAGIC_SYSRQ
504 * restore fbcon display for all kms driver's using this helper, used for sysrq
505 * and panic handling.
507 static bool drm_fb_helper_force_kernel_mode(void)
509 bool ret
, error
= false;
510 struct drm_fb_helper
*helper
;
512 if (list_empty(&kernel_fb_helper_list
))
515 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
516 struct drm_device
*dev
= helper
->dev
;
518 if (dev
->switch_power_state
== DRM_SWITCH_POWER_OFF
)
521 drm_modeset_lock_all(dev
);
522 ret
= restore_fbdev_mode(helper
);
525 drm_modeset_unlock_all(dev
);
530 static void drm_fb_helper_restore_work_fn(struct work_struct
*ignored
)
533 ret
= drm_fb_helper_force_kernel_mode();
535 DRM_ERROR("Failed to restore crtc configuration\n");
537 static DECLARE_WORK(drm_fb_helper_restore_work
, drm_fb_helper_restore_work_fn
);
539 static void drm_fb_helper_sysrq(int dummy1
)
541 schedule_work(&drm_fb_helper_restore_work
);
544 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
545 .handler
= drm_fb_helper_sysrq
,
546 .help_msg
= "force-fb(V)",
547 .action_msg
= "Restore framebuffer console",
550 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= { };
553 static void drm_fb_helper_dpms(struct fb_info
*info
, int dpms_mode
)
555 struct drm_fb_helper
*fb_helper
= info
->par
;
556 struct drm_device
*dev
= fb_helper
->dev
;
557 struct drm_crtc
*crtc
;
558 struct drm_connector
*connector
;
562 * For each CRTC in this fb, turn the connectors on/off.
564 drm_modeset_lock_all(dev
);
565 if (!drm_fb_helper_is_bound(fb_helper
)) {
566 drm_modeset_unlock_all(dev
);
570 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
571 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
576 /* Walk the connectors & encoders on this fb turning them on/off */
577 drm_fb_helper_for_each_connector(fb_helper
, j
) {
578 connector
= fb_helper
->connector_info
[j
]->connector
;
579 connector
->funcs
->dpms(connector
, dpms_mode
);
580 drm_object_property_set_value(&connector
->base
,
581 dev
->mode_config
.dpms_property
, dpms_mode
);
584 drm_modeset_unlock_all(dev
);
588 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank
589 * @blank: desired blanking state
590 * @info: fbdev registered by the helper
592 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
594 if (oops_in_progress
)
598 /* Display: On; HSync: On, VSync: On */
599 case FB_BLANK_UNBLANK
:
600 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
602 /* Display: Off; HSync: On, VSync: On */
603 case FB_BLANK_NORMAL
:
604 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
606 /* Display: Off; HSync: Off, VSync: On */
607 case FB_BLANK_HSYNC_SUSPEND
:
608 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
610 /* Display: Off; HSync: On, VSync: Off */
611 case FB_BLANK_VSYNC_SUSPEND
:
612 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
614 /* Display: Off; HSync: Off, VSync: Off */
615 case FB_BLANK_POWERDOWN
:
616 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
621 EXPORT_SYMBOL(drm_fb_helper_blank
);
623 static void drm_fb_helper_modeset_release(struct drm_fb_helper
*helper
,
624 struct drm_mode_set
*modeset
)
628 for (i
= 0; i
< modeset
->num_connectors
; i
++) {
629 drm_connector_unreference(modeset
->connectors
[i
]);
630 modeset
->connectors
[i
] = NULL
;
632 modeset
->num_connectors
= 0;
634 drm_mode_destroy(helper
->dev
, modeset
->mode
);
635 modeset
->mode
= NULL
;
637 /* FIXME should hold a ref? */
641 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
645 for (i
= 0; i
< helper
->connector_count
; i
++) {
646 drm_connector_unreference(helper
->connector_info
[i
]->connector
);
647 kfree(helper
->connector_info
[i
]);
649 kfree(helper
->connector_info
);
651 for (i
= 0; i
< helper
->crtc_count
; i
++) {
652 struct drm_mode_set
*modeset
= &helper
->crtc_info
[i
].mode_set
;
654 drm_fb_helper_modeset_release(helper
, modeset
);
655 kfree(modeset
->connectors
);
657 kfree(helper
->crtc_info
);
660 static void drm_fb_helper_resume_worker(struct work_struct
*work
)
662 struct drm_fb_helper
*helper
= container_of(work
, struct drm_fb_helper
,
666 fb_set_suspend(helper
->fbdev
, 0);
670 static void drm_fb_helper_dirty_work(struct work_struct
*work
)
672 struct drm_fb_helper
*helper
= container_of(work
, struct drm_fb_helper
,
674 struct drm_clip_rect
*clip
= &helper
->dirty_clip
;
675 struct drm_clip_rect clip_copy
;
678 spin_lock_irqsave(&helper
->dirty_lock
, flags
);
680 clip
->x1
= clip
->y1
= ~0;
681 clip
->x2
= clip
->y2
= 0;
682 spin_unlock_irqrestore(&helper
->dirty_lock
, flags
);
684 /* call dirty callback only when it has been really touched */
685 if (clip_copy
.x1
< clip_copy
.x2
&& clip_copy
.y1
< clip_copy
.y2
)
686 helper
->fb
->funcs
->dirty(helper
->fb
, NULL
, 0, 0, &clip_copy
, 1);
690 * drm_fb_helper_prepare - setup a drm_fb_helper structure
692 * @helper: driver-allocated fbdev helper structure to set up
693 * @funcs: pointer to structure of functions associate with this helper
695 * Sets up the bare minimum to make the framebuffer helper usable. This is
696 * useful to implement race-free initialization of the polling helpers.
698 void drm_fb_helper_prepare(struct drm_device
*dev
, struct drm_fb_helper
*helper
,
699 const struct drm_fb_helper_funcs
*funcs
)
701 INIT_LIST_HEAD(&helper
->kernel_fb_list
);
702 spin_lock_init(&helper
->dirty_lock
);
703 INIT_WORK(&helper
->resume_work
, drm_fb_helper_resume_worker
);
704 INIT_WORK(&helper
->dirty_work
, drm_fb_helper_dirty_work
);
705 helper
->dirty_clip
.x1
= helper
->dirty_clip
.y1
= ~0;
706 helper
->funcs
= funcs
;
709 EXPORT_SYMBOL(drm_fb_helper_prepare
);
712 * drm_fb_helper_init - initialize a drm_fb_helper structure
714 * @fb_helper: driver-allocated fbdev helper structure to initialize
715 * @max_conn_count: max connector count
717 * This allocates the structures for the fbdev helper with the given limits.
718 * Note that this won't yet touch the hardware (through the driver interfaces)
719 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
720 * to allow driver writes more control over the exact init sequence.
722 * Drivers must call drm_fb_helper_prepare() before calling this function.
725 * Zero if everything went ok, nonzero otherwise.
727 int drm_fb_helper_init(struct drm_device
*dev
,
728 struct drm_fb_helper
*fb_helper
,
731 struct drm_crtc
*crtc
;
732 struct drm_mode_config
*config
= &dev
->mode_config
;
735 if (!drm_fbdev_emulation
)
741 fb_helper
->crtc_info
= kcalloc(config
->num_crtc
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
742 if (!fb_helper
->crtc_info
)
745 fb_helper
->crtc_count
= config
->num_crtc
;
746 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
747 if (!fb_helper
->connector_info
) {
748 kfree(fb_helper
->crtc_info
);
751 fb_helper
->connector_info_alloc_count
= dev
->mode_config
.num_connector
;
752 fb_helper
->connector_count
= 0;
754 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
755 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
756 kcalloc(max_conn_count
,
757 sizeof(struct drm_connector
*),
760 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
762 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
766 drm_for_each_crtc(crtc
, dev
) {
767 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
773 drm_fb_helper_crtc_free(fb_helper
);
776 EXPORT_SYMBOL(drm_fb_helper_init
);
779 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
780 * @fb_helper: driver-allocated fbdev helper
782 * A helper to alloc fb_info and the members cmap and apertures. Called
783 * by the driver within the fb_probe fb_helper callback function.
786 * fb_info pointer if things went okay, pointer containing error code
789 struct fb_info
*drm_fb_helper_alloc_fbi(struct drm_fb_helper
*fb_helper
)
791 struct device
*dev
= fb_helper
->dev
->dev
;
792 struct fb_info
*info
;
795 info
= framebuffer_alloc(0, dev
);
797 return ERR_PTR(-ENOMEM
);
799 ret
= fb_alloc_cmap(&info
->cmap
, 256, 0);
803 info
->apertures
= alloc_apertures(1);
804 if (!info
->apertures
) {
809 fb_helper
->fbdev
= info
;
814 fb_dealloc_cmap(&info
->cmap
);
816 framebuffer_release(info
);
819 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi
);
822 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
823 * @fb_helper: driver-allocated fbdev helper
825 * A wrapper around unregister_framebuffer, to release the fb_info
828 void drm_fb_helper_unregister_fbi(struct drm_fb_helper
*fb_helper
)
830 if (fb_helper
&& fb_helper
->fbdev
)
831 unregister_framebuffer(fb_helper
->fbdev
);
833 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi
);
836 * drm_fb_helper_release_fbi - dealloc fb_info and its members
837 * @fb_helper: driver-allocated fbdev helper
839 * A helper to free memory taken by fb_info and the members cmap and
842 void drm_fb_helper_release_fbi(struct drm_fb_helper
*fb_helper
)
845 struct fb_info
*info
= fb_helper
->fbdev
;
849 fb_dealloc_cmap(&info
->cmap
);
850 framebuffer_release(info
);
853 fb_helper
->fbdev
= NULL
;
856 EXPORT_SYMBOL(drm_fb_helper_release_fbi
);
858 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
860 if (!drm_fbdev_emulation
)
863 cancel_work_sync(&fb_helper
->resume_work
);
864 cancel_work_sync(&fb_helper
->dirty_work
);
866 mutex_lock(&kernel_fb_helper_lock
);
867 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
868 list_del(&fb_helper
->kernel_fb_list
);
869 if (list_empty(&kernel_fb_helper_list
)) {
870 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
873 mutex_unlock(&kernel_fb_helper_lock
);
875 drm_fb_helper_crtc_free(fb_helper
);
878 EXPORT_SYMBOL(drm_fb_helper_fini
);
881 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
882 * @fb_helper: driver-allocated fbdev helper
884 * A wrapper around unlink_framebuffer implemented by fbdev core
886 void drm_fb_helper_unlink_fbi(struct drm_fb_helper
*fb_helper
)
888 if (fb_helper
&& fb_helper
->fbdev
)
889 unlink_framebuffer(fb_helper
->fbdev
);
891 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi
);
893 static void drm_fb_helper_dirty(struct fb_info
*info
, u32 x
, u32 y
,
894 u32 width
, u32 height
)
896 struct drm_fb_helper
*helper
= info
->par
;
897 struct drm_clip_rect
*clip
= &helper
->dirty_clip
;
900 if (!helper
->fb
->funcs
->dirty
)
903 spin_lock_irqsave(&helper
->dirty_lock
, flags
);
904 clip
->x1
= min_t(u32
, clip
->x1
, x
);
905 clip
->y1
= min_t(u32
, clip
->y1
, y
);
906 clip
->x2
= max_t(u32
, clip
->x2
, x
+ width
);
907 clip
->y2
= max_t(u32
, clip
->y2
, y
+ height
);
908 spin_unlock_irqrestore(&helper
->dirty_lock
, flags
);
910 schedule_work(&helper
->dirty_work
);
914 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
915 * @info: fb_info struct pointer
916 * @pagelist: list of dirty mmap framebuffer pages
918 * This function is used as the &fb_deferred_io.deferred_io
919 * callback function for flushing the fbdev mmap writes.
921 void drm_fb_helper_deferred_io(struct fb_info
*info
,
922 struct list_head
*pagelist
)
924 unsigned long start
, end
, min
, max
;
930 list_for_each_entry(page
, pagelist
, lru
) {
931 start
= page
->index
<< PAGE_SHIFT
;
932 end
= start
+ PAGE_SIZE
- 1;
933 min
= min(min
, start
);
938 y1
= min
/ info
->fix
.line_length
;
939 y2
= min_t(u32
, DIV_ROUND_UP(max
, info
->fix
.line_length
),
941 drm_fb_helper_dirty(info
, 0, y1
, info
->var
.xres
, y2
- y1
);
944 EXPORT_SYMBOL(drm_fb_helper_deferred_io
);
947 * drm_fb_helper_sys_read - wrapper around fb_sys_read
948 * @info: fb_info struct pointer
949 * @buf: userspace buffer to read from framebuffer memory
950 * @count: number of bytes to read from framebuffer memory
951 * @ppos: read offset within framebuffer memory
953 * A wrapper around fb_sys_read implemented by fbdev core
955 ssize_t
drm_fb_helper_sys_read(struct fb_info
*info
, char __user
*buf
,
956 size_t count
, loff_t
*ppos
)
958 return fb_sys_read(info
, buf
, count
, ppos
);
960 EXPORT_SYMBOL(drm_fb_helper_sys_read
);
963 * drm_fb_helper_sys_write - wrapper around fb_sys_write
964 * @info: fb_info struct pointer
965 * @buf: userspace buffer to write to framebuffer memory
966 * @count: number of bytes to write to framebuffer memory
967 * @ppos: write offset within framebuffer memory
969 * A wrapper around fb_sys_write implemented by fbdev core
971 ssize_t
drm_fb_helper_sys_write(struct fb_info
*info
, const char __user
*buf
,
972 size_t count
, loff_t
*ppos
)
976 ret
= fb_sys_write(info
, buf
, count
, ppos
);
978 drm_fb_helper_dirty(info
, 0, 0, info
->var
.xres
,
983 EXPORT_SYMBOL(drm_fb_helper_sys_write
);
986 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
987 * @info: fbdev registered by the helper
988 * @rect: info about rectangle to fill
990 * A wrapper around sys_fillrect implemented by fbdev core
992 void drm_fb_helper_sys_fillrect(struct fb_info
*info
,
993 const struct fb_fillrect
*rect
)
995 sys_fillrect(info
, rect
);
996 drm_fb_helper_dirty(info
, rect
->dx
, rect
->dy
,
997 rect
->width
, rect
->height
);
999 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect
);
1002 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
1003 * @info: fbdev registered by the helper
1004 * @area: info about area to copy
1006 * A wrapper around sys_copyarea implemented by fbdev core
1008 void drm_fb_helper_sys_copyarea(struct fb_info
*info
,
1009 const struct fb_copyarea
*area
)
1011 sys_copyarea(info
, area
);
1012 drm_fb_helper_dirty(info
, area
->dx
, area
->dy
,
1013 area
->width
, area
->height
);
1015 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea
);
1018 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
1019 * @info: fbdev registered by the helper
1020 * @image: info about image to blit
1022 * A wrapper around sys_imageblit implemented by fbdev core
1024 void drm_fb_helper_sys_imageblit(struct fb_info
*info
,
1025 const struct fb_image
*image
)
1027 sys_imageblit(info
, image
);
1028 drm_fb_helper_dirty(info
, image
->dx
, image
->dy
,
1029 image
->width
, image
->height
);
1031 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit
);
1034 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
1035 * @info: fbdev registered by the helper
1036 * @rect: info about rectangle to fill
1038 * A wrapper around cfb_imageblit implemented by fbdev core
1040 void drm_fb_helper_cfb_fillrect(struct fb_info
*info
,
1041 const struct fb_fillrect
*rect
)
1043 cfb_fillrect(info
, rect
);
1044 drm_fb_helper_dirty(info
, rect
->dx
, rect
->dy
,
1045 rect
->width
, rect
->height
);
1047 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect
);
1050 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
1051 * @info: fbdev registered by the helper
1052 * @area: info about area to copy
1054 * A wrapper around cfb_copyarea implemented by fbdev core
1056 void drm_fb_helper_cfb_copyarea(struct fb_info
*info
,
1057 const struct fb_copyarea
*area
)
1059 cfb_copyarea(info
, area
);
1060 drm_fb_helper_dirty(info
, area
->dx
, area
->dy
,
1061 area
->width
, area
->height
);
1063 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea
);
1066 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1067 * @info: fbdev registered by the helper
1068 * @image: info about image to blit
1070 * A wrapper around cfb_imageblit implemented by fbdev core
1072 void drm_fb_helper_cfb_imageblit(struct fb_info
*info
,
1073 const struct fb_image
*image
)
1075 cfb_imageblit(info
, image
);
1076 drm_fb_helper_dirty(info
, image
->dx
, image
->dy
,
1077 image
->width
, image
->height
);
1079 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit
);
1082 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1083 * @fb_helper: driver-allocated fbdev helper
1084 * @suspend: whether to suspend or resume
1086 * A wrapper around fb_set_suspend implemented by fbdev core.
1087 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
1090 void drm_fb_helper_set_suspend(struct drm_fb_helper
*fb_helper
, bool suspend
)
1092 if (fb_helper
&& fb_helper
->fbdev
)
1093 fb_set_suspend(fb_helper
->fbdev
, suspend
);
1095 EXPORT_SYMBOL(drm_fb_helper_set_suspend
);
1098 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
1099 * takes the console lock
1100 * @fb_helper: driver-allocated fbdev helper
1101 * @suspend: whether to suspend or resume
1103 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
1104 * isn't available on resume, a worker is tasked with waiting for the lock
1105 * to become available. The console lock can be pretty contented on resume
1106 * due to all the printk activity.
1108 * This function can be called multiple times with the same state since
1109 * &fb_info.state is checked to see if fbdev is running or not before locking.
1111 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
1113 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper
*fb_helper
,
1116 if (!fb_helper
|| !fb_helper
->fbdev
)
1119 /* make sure there's no pending/ongoing resume */
1120 flush_work(&fb_helper
->resume_work
);
1123 if (fb_helper
->fbdev
->state
!= FBINFO_STATE_RUNNING
)
1129 if (fb_helper
->fbdev
->state
== FBINFO_STATE_RUNNING
)
1132 if (!console_trylock()) {
1133 schedule_work(&fb_helper
->resume_work
);
1138 fb_set_suspend(fb_helper
->fbdev
, suspend
);
1141 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked
);
1143 static int setcolreg(struct drm_crtc
*crtc
, u16 red
, u16 green
,
1144 u16 blue
, u16 regno
, struct fb_info
*info
)
1146 struct drm_fb_helper
*fb_helper
= info
->par
;
1147 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1149 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
) {
1152 /* place color in psuedopalette */
1155 palette
= (u32
*)info
->pseudo_palette
;
1156 red
>>= (16 - info
->var
.red
.length
);
1157 green
>>= (16 - info
->var
.green
.length
);
1158 blue
>>= (16 - info
->var
.blue
.length
);
1159 value
= (red
<< info
->var
.red
.offset
) |
1160 (green
<< info
->var
.green
.offset
) |
1161 (blue
<< info
->var
.blue
.offset
);
1162 if (info
->var
.transp
.length
> 0) {
1163 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
1164 mask
<<= info
->var
.transp
.offset
;
1167 palette
[regno
] = value
;
1172 * The driver really shouldn't advertise pseudo/directcolor
1173 * visuals if it can't deal with the palette.
1175 if (WARN_ON(!fb_helper
->funcs
->gamma_set
||
1176 !fb_helper
->funcs
->gamma_get
))
1179 WARN_ON(fb
->format
->cpp
[0] != 1);
1181 fb_helper
->funcs
->gamma_set(crtc
, red
, green
, blue
, regno
);
1187 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
1188 * @cmap: cmap to set
1189 * @info: fbdev registered by the helper
1191 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
1193 struct drm_fb_helper
*fb_helper
= info
->par
;
1194 struct drm_device
*dev
= fb_helper
->dev
;
1195 const struct drm_crtc_helper_funcs
*crtc_funcs
;
1196 u16
*red
, *green
, *blue
, *transp
;
1197 struct drm_crtc
*crtc
;
1201 if (oops_in_progress
)
1204 drm_modeset_lock_all(dev
);
1205 if (!drm_fb_helper_is_bound(fb_helper
)) {
1206 drm_modeset_unlock_all(dev
);
1210 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1211 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
1212 crtc_funcs
= crtc
->helper_private
;
1215 green
= cmap
->green
;
1217 transp
= cmap
->transp
;
1218 start
= cmap
->start
;
1220 for (j
= 0; j
< cmap
->len
; j
++) {
1221 u16 hred
, hgreen
, hblue
, htransp
= 0xffff;
1228 htransp
= *transp
++;
1230 rc
= setcolreg(crtc
, hred
, hgreen
, hblue
, start
++, info
);
1234 if (crtc_funcs
->load_lut
)
1235 crtc_funcs
->load_lut(crtc
);
1238 drm_modeset_unlock_all(dev
);
1241 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
1244 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
1245 * @var: screeninfo to check
1246 * @info: fbdev registered by the helper
1248 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
1249 struct fb_info
*info
)
1251 struct drm_fb_helper
*fb_helper
= info
->par
;
1252 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1255 if (var
->pixclock
!= 0 || in_dbg_master())
1259 * Changes struct fb_var_screeninfo are currently not pushed back
1260 * to KMS, hence fail if different settings are requested.
1262 if (var
->bits_per_pixel
!= fb
->format
->cpp
[0] * 8 ||
1263 var
->xres
!= fb
->width
|| var
->yres
!= fb
->height
||
1264 var
->xres_virtual
!= fb
->width
|| var
->yres_virtual
!= fb
->height
) {
1265 DRM_DEBUG("fb userspace requested width/height/bpp different than current fb "
1266 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1267 var
->xres
, var
->yres
, var
->bits_per_pixel
,
1268 var
->xres_virtual
, var
->yres_virtual
,
1269 fb
->width
, fb
->height
, fb
->format
->cpp
[0] * 8);
1273 switch (var
->bits_per_pixel
) {
1275 depth
= (var
->green
.length
== 6) ? 16 : 15;
1278 depth
= (var
->transp
.length
> 0) ? 32 : 24;
1281 depth
= var
->bits_per_pixel
;
1287 var
->red
.offset
= 0;
1288 var
->green
.offset
= 0;
1289 var
->blue
.offset
= 0;
1290 var
->red
.length
= 8;
1291 var
->green
.length
= 8;
1292 var
->blue
.length
= 8;
1293 var
->transp
.length
= 0;
1294 var
->transp
.offset
= 0;
1297 var
->red
.offset
= 10;
1298 var
->green
.offset
= 5;
1299 var
->blue
.offset
= 0;
1300 var
->red
.length
= 5;
1301 var
->green
.length
= 5;
1302 var
->blue
.length
= 5;
1303 var
->transp
.length
= 1;
1304 var
->transp
.offset
= 15;
1307 var
->red
.offset
= 11;
1308 var
->green
.offset
= 5;
1309 var
->blue
.offset
= 0;
1310 var
->red
.length
= 5;
1311 var
->green
.length
= 6;
1312 var
->blue
.length
= 5;
1313 var
->transp
.length
= 0;
1314 var
->transp
.offset
= 0;
1317 var
->red
.offset
= 16;
1318 var
->green
.offset
= 8;
1319 var
->blue
.offset
= 0;
1320 var
->red
.length
= 8;
1321 var
->green
.length
= 8;
1322 var
->blue
.length
= 8;
1323 var
->transp
.length
= 0;
1324 var
->transp
.offset
= 0;
1327 var
->red
.offset
= 16;
1328 var
->green
.offset
= 8;
1329 var
->blue
.offset
= 0;
1330 var
->red
.length
= 8;
1331 var
->green
.length
= 8;
1332 var
->blue
.length
= 8;
1333 var
->transp
.length
= 8;
1334 var
->transp
.offset
= 24;
1341 EXPORT_SYMBOL(drm_fb_helper_check_var
);
1344 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
1345 * @info: fbdev registered by the helper
1347 * This will let fbcon do the mode init and is called at initialization time by
1348 * the fbdev core when registering the driver, and later on through the hotplug
1351 int drm_fb_helper_set_par(struct fb_info
*info
)
1353 struct drm_fb_helper
*fb_helper
= info
->par
;
1354 struct fb_var_screeninfo
*var
= &info
->var
;
1356 if (oops_in_progress
)
1359 if (var
->pixclock
!= 0) {
1360 DRM_ERROR("PIXEL CLOCK SET\n");
1364 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper
);
1368 EXPORT_SYMBOL(drm_fb_helper_set_par
);
1370 static int pan_display_atomic(struct fb_var_screeninfo
*var
,
1371 struct fb_info
*info
)
1373 struct drm_fb_helper
*fb_helper
= info
->par
;
1374 struct drm_device
*dev
= fb_helper
->dev
;
1375 struct drm_atomic_state
*state
;
1376 struct drm_plane
*plane
;
1378 unsigned plane_mask
;
1380 state
= drm_atomic_state_alloc(dev
);
1384 state
->acquire_ctx
= dev
->mode_config
.acquire_ctx
;
1387 for(i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1388 struct drm_mode_set
*mode_set
;
1390 mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
1392 mode_set
->x
= var
->xoffset
;
1393 mode_set
->y
= var
->yoffset
;
1395 ret
= __drm_atomic_helper_set_config(mode_set
, state
);
1399 plane
= mode_set
->crtc
->primary
;
1400 plane_mask
|= (1 << drm_plane_index(plane
));
1401 plane
->old_fb
= plane
->fb
;
1404 ret
= drm_atomic_commit(state
);
1408 info
->var
.xoffset
= var
->xoffset
;
1409 info
->var
.yoffset
= var
->yoffset
;
1412 drm_atomic_clean_old_fb(dev
, plane_mask
, ret
);
1414 if (ret
== -EDEADLK
)
1417 drm_atomic_state_put(state
);
1421 drm_atomic_state_clear(state
);
1422 drm_atomic_legacy_backoff(state
);
1428 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
1429 * @var: updated screen information
1430 * @info: fbdev registered by the helper
1432 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
1433 struct fb_info
*info
)
1435 struct drm_fb_helper
*fb_helper
= info
->par
;
1436 struct drm_device
*dev
= fb_helper
->dev
;
1437 struct drm_mode_set
*modeset
;
1441 if (oops_in_progress
)
1444 drm_modeset_lock_all(dev
);
1445 if (!drm_fb_helper_is_bound(fb_helper
)) {
1446 drm_modeset_unlock_all(dev
);
1450 if (drm_drv_uses_atomic_modeset(dev
)) {
1451 ret
= pan_display_atomic(var
, info
);
1455 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1456 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1458 modeset
->x
= var
->xoffset
;
1459 modeset
->y
= var
->yoffset
;
1461 if (modeset
->num_connectors
) {
1462 ret
= drm_mode_set_config_internal(modeset
);
1464 info
->var
.xoffset
= var
->xoffset
;
1465 info
->var
.yoffset
= var
->yoffset
;
1470 drm_modeset_unlock_all(dev
);
1473 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
1476 * Allocates the backing storage and sets up the fbdev info structure through
1477 * the ->fb_probe callback and then registers the fbdev and sets up the panic
1480 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
1486 struct drm_fb_helper_surface_size sizes
;
1489 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
1490 sizes
.surface_depth
= 24;
1491 sizes
.surface_bpp
= 32;
1492 sizes
.fb_width
= (unsigned)-1;
1493 sizes
.fb_height
= (unsigned)-1;
1495 /* if driver picks 8 or 16 by default use that
1496 for both depth/bpp */
1497 if (preferred_bpp
!= sizes
.surface_bpp
)
1498 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
1500 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1501 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1502 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
1503 struct drm_cmdline_mode
*cmdline_mode
;
1505 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
1507 if (cmdline_mode
->bpp_specified
) {
1508 switch (cmdline_mode
->bpp
) {
1510 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
1513 sizes
.surface_depth
= 15;
1514 sizes
.surface_bpp
= 16;
1517 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
1520 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
1523 sizes
.surface_depth
= 24;
1524 sizes
.surface_bpp
= 32;
1532 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1533 struct drm_display_mode
*desired_mode
;
1534 struct drm_mode_set
*mode_set
;
1536 /* in case of tile group, are we the last tile vert or horiz?
1537 * If no tile group you are always the last one both vertically
1540 bool lastv
= true, lasth
= true;
1542 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
1543 mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
1550 x
= fb_helper
->crtc_info
[i
].x
;
1551 y
= fb_helper
->crtc_info
[i
].y
;
1553 if (gamma_size
== 0)
1554 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
1556 sizes
.surface_width
= max_t(u32
, desired_mode
->hdisplay
+ x
, sizes
.surface_width
);
1557 sizes
.surface_height
= max_t(u32
, desired_mode
->vdisplay
+ y
, sizes
.surface_height
);
1559 for (j
= 0; j
< mode_set
->num_connectors
; j
++) {
1560 struct drm_connector
*connector
= mode_set
->connectors
[j
];
1561 if (connector
->has_tile
) {
1562 lasth
= (connector
->tile_h_loc
== (connector
->num_h_tile
- 1));
1563 lastv
= (connector
->tile_v_loc
== (connector
->num_v_tile
- 1));
1564 /* cloning to multiple tiles is just crazy-talk, so: */
1570 sizes
.fb_width
= min_t(u32
, desired_mode
->hdisplay
+ x
, sizes
.fb_width
);
1572 sizes
.fb_height
= min_t(u32
, desired_mode
->vdisplay
+ y
, sizes
.fb_height
);
1575 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
1576 /* hmm everyone went away - assume VGA cable just fell out
1577 and will come back later. */
1578 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1579 sizes
.fb_width
= sizes
.surface_width
= 1024;
1580 sizes
.fb_height
= sizes
.surface_height
= 768;
1583 /* push down into drivers */
1584 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
1589 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1590 * events, but at init time drm_setup_crtcs needs to be called before
1591 * the fb is allocated (since we need to figure out the desired size of
1592 * the fb before we can allocate it ...). Hence we need to fix things up
1595 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
1596 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
1597 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
1603 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1604 * @info: fbdev registered by the helper
1605 * @pitch: desired pitch
1606 * @depth: desired depth
1608 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1609 * fbdev emulations. Drivers which support acceleration methods which impose
1610 * additional constraints need to set up their own limits.
1612 * Drivers should call this (or their equivalent setup code) from their
1613 * &drm_fb_helper_funcs.fb_probe callback.
1615 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1618 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1619 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1620 FB_VISUAL_TRUECOLOR
;
1621 info
->fix
.mmio_start
= 0;
1622 info
->fix
.mmio_len
= 0;
1623 info
->fix
.type_aux
= 0;
1624 info
->fix
.xpanstep
= 1; /* doing it in hw */
1625 info
->fix
.ypanstep
= 1; /* doing it in hw */
1626 info
->fix
.ywrapstep
= 0;
1627 info
->fix
.accel
= FB_ACCEL_NONE
;
1629 info
->fix
.line_length
= pitch
;
1632 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1635 * drm_fb_helper_fill_var - initalizes variable fbdev information
1636 * @info: fbdev instance to set up
1637 * @fb_helper: fb helper instance to use as template
1638 * @fb_width: desired fb width
1639 * @fb_height: desired fb height
1641 * Sets up the variable fbdev metainformation from the given fb helper instance
1642 * and the drm framebuffer allocated in &drm_fb_helper.fb.
1644 * Drivers should call this (or their equivalent setup code) from their
1645 * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
1646 * backing storage framebuffer.
1648 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1649 uint32_t fb_width
, uint32_t fb_height
)
1651 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1652 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1653 info
->var
.xres_virtual
= fb
->width
;
1654 info
->var
.yres_virtual
= fb
->height
;
1655 info
->var
.bits_per_pixel
= fb
->format
->cpp
[0] * 8;
1656 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1657 info
->var
.xoffset
= 0;
1658 info
->var
.yoffset
= 0;
1659 info
->var
.activate
= FB_ACTIVATE_NOW
;
1660 info
->var
.height
= -1;
1661 info
->var
.width
= -1;
1663 switch (fb
->format
->depth
) {
1665 info
->var
.red
.offset
= 0;
1666 info
->var
.green
.offset
= 0;
1667 info
->var
.blue
.offset
= 0;
1668 info
->var
.red
.length
= 8; /* 8bit DAC */
1669 info
->var
.green
.length
= 8;
1670 info
->var
.blue
.length
= 8;
1671 info
->var
.transp
.offset
= 0;
1672 info
->var
.transp
.length
= 0;
1675 info
->var
.red
.offset
= 10;
1676 info
->var
.green
.offset
= 5;
1677 info
->var
.blue
.offset
= 0;
1678 info
->var
.red
.length
= 5;
1679 info
->var
.green
.length
= 5;
1680 info
->var
.blue
.length
= 5;
1681 info
->var
.transp
.offset
= 15;
1682 info
->var
.transp
.length
= 1;
1685 info
->var
.red
.offset
= 11;
1686 info
->var
.green
.offset
= 5;
1687 info
->var
.blue
.offset
= 0;
1688 info
->var
.red
.length
= 5;
1689 info
->var
.green
.length
= 6;
1690 info
->var
.blue
.length
= 5;
1691 info
->var
.transp
.offset
= 0;
1694 info
->var
.red
.offset
= 16;
1695 info
->var
.green
.offset
= 8;
1696 info
->var
.blue
.offset
= 0;
1697 info
->var
.red
.length
= 8;
1698 info
->var
.green
.length
= 8;
1699 info
->var
.blue
.length
= 8;
1700 info
->var
.transp
.offset
= 0;
1701 info
->var
.transp
.length
= 0;
1704 info
->var
.red
.offset
= 16;
1705 info
->var
.green
.offset
= 8;
1706 info
->var
.blue
.offset
= 0;
1707 info
->var
.red
.length
= 8;
1708 info
->var
.green
.length
= 8;
1709 info
->var
.blue
.length
= 8;
1710 info
->var
.transp
.offset
= 24;
1711 info
->var
.transp
.length
= 8;
1717 info
->var
.xres
= fb_width
;
1718 info
->var
.yres
= fb_height
;
1720 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1722 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1726 struct drm_connector
*connector
;
1730 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1731 connector
= fb_helper
->connector_info
[i
]->connector
;
1732 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1738 struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1740 struct drm_display_mode
*mode
;
1742 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1743 if (mode
->hdisplay
> width
||
1744 mode
->vdisplay
> height
)
1746 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1751 EXPORT_SYMBOL(drm_has_preferred_mode
);
1753 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1755 return fb_connector
->connector
->cmdline_mode
.specified
;
1758 struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
)
1760 struct drm_cmdline_mode
*cmdline_mode
;
1761 struct drm_display_mode
*mode
;
1762 bool prefer_non_interlace
;
1764 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
1765 if (cmdline_mode
->specified
== false)
1768 /* attempt to find a matching mode in the list of modes
1769 * we have gotten so far, if not add a CVT mode that conforms
1771 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1774 prefer_non_interlace
= !cmdline_mode
->interlace
;
1776 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1777 /* check width/height */
1778 if (mode
->hdisplay
!= cmdline_mode
->xres
||
1779 mode
->vdisplay
!= cmdline_mode
->yres
)
1782 if (cmdline_mode
->refresh_specified
) {
1783 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
1787 if (cmdline_mode
->interlace
) {
1788 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
1790 } else if (prefer_non_interlace
) {
1791 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
1797 if (prefer_non_interlace
) {
1798 prefer_non_interlace
= false;
1803 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
1805 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
1808 EXPORT_SYMBOL(drm_pick_cmdline_mode
);
1810 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
1815 enable
= connector
->status
== connector_status_connected
;
1817 enable
= connector
->status
!= connector_status_disconnected
;
1822 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
1825 bool any_enabled
= false;
1826 struct drm_connector
*connector
;
1829 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1830 connector
= fb_helper
->connector_info
[i
]->connector
;
1831 enabled
[i
] = drm_connector_enabled(connector
, true);
1832 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
1833 enabled
[i
] ? "yes" : "no");
1834 any_enabled
|= enabled
[i
];
1840 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1841 connector
= fb_helper
->connector_info
[i
]->connector
;
1842 enabled
[i
] = drm_connector_enabled(connector
, false);
1846 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
1847 struct drm_display_mode
**modes
,
1848 struct drm_fb_offset
*offsets
,
1849 bool *enabled
, int width
, int height
)
1852 bool can_clone
= false;
1853 struct drm_fb_helper_connector
*fb_helper_conn
;
1854 struct drm_display_mode
*dmt_mode
, *mode
;
1856 /* only contemplate cloning in the single crtc case */
1857 if (fb_helper
->crtc_count
> 1)
1861 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1866 /* only contemplate cloning if more than one connector is enabled */
1870 /* check the command line or if nothing common pick 1024x768 */
1872 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1875 fb_helper_conn
= fb_helper
->connector_info
[i
];
1876 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
);
1881 for (j
= 0; j
< i
; j
++) {
1884 if (!drm_mode_equal(modes
[j
], modes
[i
]))
1890 DRM_DEBUG_KMS("can clone using command line\n");
1894 /* try and find a 1024x768 mode on each connector */
1896 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
1898 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1902 fb_helper_conn
= fb_helper
->connector_info
[i
];
1903 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1904 if (drm_mode_equal(mode
, dmt_mode
))
1912 DRM_DEBUG_KMS("can clone using 1024x768\n");
1915 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1919 static int drm_get_tile_offsets(struct drm_fb_helper
*fb_helper
,
1920 struct drm_display_mode
**modes
,
1921 struct drm_fb_offset
*offsets
,
1923 int h_idx
, int v_idx
)
1925 struct drm_fb_helper_connector
*fb_helper_conn
;
1927 int hoffset
= 0, voffset
= 0;
1929 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1930 fb_helper_conn
= fb_helper
->connector_info
[i
];
1931 if (!fb_helper_conn
->connector
->has_tile
)
1934 if (!modes
[i
] && (h_idx
|| v_idx
)) {
1935 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i
,
1936 fb_helper_conn
->connector
->base
.id
);
1939 if (fb_helper_conn
->connector
->tile_h_loc
< h_idx
)
1940 hoffset
+= modes
[i
]->hdisplay
;
1942 if (fb_helper_conn
->connector
->tile_v_loc
< v_idx
)
1943 voffset
+= modes
[i
]->vdisplay
;
1945 offsets
[idx
].x
= hoffset
;
1946 offsets
[idx
].y
= voffset
;
1947 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset
, voffset
, h_idx
, v_idx
);
1951 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
1952 struct drm_display_mode
**modes
,
1953 struct drm_fb_offset
*offsets
,
1954 bool *enabled
, int width
, int height
)
1956 struct drm_fb_helper_connector
*fb_helper_conn
;
1957 const u64 mask
= BIT_ULL(fb_helper
->connector_count
) - 1;
1958 u64 conn_configured
= 0;
1963 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1964 fb_helper_conn
= fb_helper
->connector_info
[i
];
1966 if (conn_configured
& BIT_ULL(i
))
1969 if (enabled
[i
] == false) {
1970 conn_configured
|= BIT_ULL(i
);
1974 /* first pass over all the untiled connectors */
1975 if (tile_pass
== 0 && fb_helper_conn
->connector
->has_tile
)
1978 if (tile_pass
== 1) {
1979 if (fb_helper_conn
->connector
->tile_h_loc
!= 0 ||
1980 fb_helper_conn
->connector
->tile_v_loc
!= 0)
1984 if (fb_helper_conn
->connector
->tile_h_loc
!= tile_pass
-1 &&
1985 fb_helper_conn
->connector
->tile_v_loc
!= tile_pass
- 1)
1986 /* if this tile_pass doesn't cover any of the tiles - keep going */
1989 /* find the tile offsets for this pass - need
1990 to find all tiles left and above */
1991 drm_get_tile_offsets(fb_helper
, modes
, offsets
,
1992 i
, fb_helper_conn
->connector
->tile_h_loc
, fb_helper_conn
->connector
->tile_v_loc
);
1994 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1995 fb_helper_conn
->connector
->base
.id
);
1997 /* got for command line mode first */
1998 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
);
2000 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
2001 fb_helper_conn
->connector
->base
.id
, fb_helper_conn
->connector
->tile_group
? fb_helper_conn
->connector
->tile_group
->id
: 0);
2002 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
2004 /* No preferred modes, pick one off the list */
2005 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
2006 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
2009 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
2011 conn_configured
|= BIT_ULL(i
);
2014 if ((conn_configured
& mask
) != mask
) {
2021 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
2022 struct drm_fb_helper_crtc
**best_crtcs
,
2023 struct drm_display_mode
**modes
,
2024 int n
, int width
, int height
)
2027 struct drm_connector
*connector
;
2028 const struct drm_connector_helper_funcs
*connector_funcs
;
2029 struct drm_encoder
*encoder
;
2030 int my_score
, best_score
, score
;
2031 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
2032 struct drm_fb_helper_connector
*fb_helper_conn
;
2034 if (n
== fb_helper
->connector_count
)
2037 fb_helper_conn
= fb_helper
->connector_info
[n
];
2038 connector
= fb_helper_conn
->connector
;
2040 best_crtcs
[n
] = NULL
;
2041 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
2042 if (modes
[n
] == NULL
)
2045 crtcs
= kzalloc(fb_helper
->connector_count
*
2046 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
2051 if (connector
->status
== connector_status_connected
)
2053 if (drm_has_cmdline_mode(fb_helper_conn
))
2055 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
2058 connector_funcs
= connector
->helper_private
;
2061 * If the DRM device implements atomic hooks and ->best_encoder() is
2062 * NULL we fallback to the default drm_atomic_helper_best_encoder()
2065 if (drm_drv_uses_atomic_modeset(fb_helper
->dev
) &&
2066 !connector_funcs
->best_encoder
)
2067 encoder
= drm_atomic_helper_best_encoder(connector
);
2069 encoder
= connector_funcs
->best_encoder(connector
);
2074 /* select a crtc for this connector and then attempt to configure
2075 remaining connectors */
2076 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
2077 crtc
= &fb_helper
->crtc_info
[c
];
2079 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
2082 for (o
= 0; o
< n
; o
++)
2083 if (best_crtcs
[o
] == crtc
)
2087 /* ignore cloning unless only a single crtc */
2088 if (fb_helper
->crtc_count
> 1)
2091 if (!drm_mode_equal(modes
[o
], modes
[n
]))
2096 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
2097 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
2099 if (score
> best_score
) {
2101 memcpy(best_crtcs
, crtcs
,
2102 fb_helper
->connector_count
*
2103 sizeof(struct drm_fb_helper_crtc
*));
2111 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
,
2112 u32 width
, u32 height
)
2114 struct drm_device
*dev
= fb_helper
->dev
;
2115 struct drm_fb_helper_crtc
**crtcs
;
2116 struct drm_display_mode
**modes
;
2117 struct drm_fb_offset
*offsets
;
2121 DRM_DEBUG_KMS("\n");
2122 if (drm_fb_helper_probe_connector_modes(fb_helper
, width
, height
) == 0)
2123 DRM_DEBUG_KMS("No connectors reported connected with modes\n");
2125 /* prevent concurrent modification of connector_count by hotplug */
2126 lockdep_assert_held(&fb_helper
->dev
->mode_config
.mutex
);
2128 crtcs
= kcalloc(fb_helper
->connector_count
,
2129 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
2130 modes
= kcalloc(fb_helper
->connector_count
,
2131 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
2132 offsets
= kcalloc(fb_helper
->connector_count
,
2133 sizeof(struct drm_fb_offset
), GFP_KERNEL
);
2134 enabled
= kcalloc(fb_helper
->connector_count
,
2135 sizeof(bool), GFP_KERNEL
);
2136 if (!crtcs
|| !modes
|| !enabled
|| !offsets
) {
2137 DRM_ERROR("Memory allocation failed\n");
2141 drm_enable_connectors(fb_helper
, enabled
);
2143 if (!(fb_helper
->funcs
->initial_config
&&
2144 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
2146 enabled
, width
, height
))) {
2147 memset(modes
, 0, fb_helper
->connector_count
*sizeof(modes
[0]));
2148 memset(crtcs
, 0, fb_helper
->connector_count
*sizeof(crtcs
[0]));
2149 memset(offsets
, 0, fb_helper
->connector_count
*sizeof(offsets
[0]));
2151 if (!drm_target_cloned(fb_helper
, modes
, offsets
,
2152 enabled
, width
, height
) &&
2153 !drm_target_preferred(fb_helper
, modes
, offsets
,
2154 enabled
, width
, height
))
2155 DRM_ERROR("Unable to find initial modes\n");
2157 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2160 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
2163 /* need to set the modesets up here for use later */
2164 /* fill out the connector<->crtc mappings into the modesets */
2165 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
2166 drm_fb_helper_modeset_release(fb_helper
,
2167 &fb_helper
->crtc_info
[i
].mode_set
);
2169 drm_fb_helper_for_each_connector(fb_helper
, i
) {
2170 struct drm_display_mode
*mode
= modes
[i
];
2171 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
2172 struct drm_fb_offset
*offset
= &offsets
[i
];
2173 struct drm_mode_set
*modeset
= &fb_crtc
->mode_set
;
2175 if (mode
&& fb_crtc
) {
2176 struct drm_connector
*connector
=
2177 fb_helper
->connector_info
[i
]->connector
;
2179 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2180 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
, offset
->x
, offset
->y
);
2182 fb_crtc
->desired_mode
= mode
;
2183 fb_crtc
->x
= offset
->x
;
2184 fb_crtc
->y
= offset
->y
;
2185 modeset
->mode
= drm_mode_duplicate(dev
,
2186 fb_crtc
->desired_mode
);
2187 drm_connector_reference(connector
);
2188 modeset
->connectors
[modeset
->num_connectors
++] = connector
;
2189 modeset
->fb
= fb_helper
->fb
;
2190 modeset
->x
= offset
->x
;
2191 modeset
->y
= offset
->y
;
2202 * drm_fb_helper_initial_config - setup a sane initial connector configuration
2203 * @fb_helper: fb_helper device struct
2204 * @bpp_sel: bpp value to use for the framebuffer configuration
2206 * Scans the CRTCs and connectors and tries to put together an initial setup.
2207 * At the moment, this is a cloned configuration across all heads with
2208 * a new framebuffer object as the backing store.
2210 * Note that this also registers the fbdev and so allows userspace to call into
2211 * the driver through the fbdev interfaces.
2213 * This function will call down into the &drm_fb_helper_funcs.fb_probe callback
2214 * to let the driver allocate and initialize the fbdev info structure and the
2215 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2216 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2217 * values for the fbdev info structure.
2221 * When you have fbcon support built-in or already loaded, this function will do
2222 * a full modeset to setup the fbdev console. Due to locking misdesign in the
2223 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2224 * console_lock. Until console_unlock is called no dmesg lines will be sent out
2225 * to consoles, not even serial console. This means when your driver crashes,
2226 * you will see absolutely nothing else but a system stuck in this function,
2227 * with no further output. Any kind of printk() you place within your own driver
2228 * or in the drm core modeset code will also never show up.
2230 * Standard debug practice is to run the fbcon setup without taking the
2231 * console_lock as a hack, to be able to see backtraces and crashes on the
2232 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2235 * The other option is to just disable fbdev emulation since very likely the
2236 * first modeset from userspace will crash in the same way, and is even easier
2237 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2238 * kernel cmdline option.
2241 * Zero if everything went ok, nonzero otherwise.
2243 int drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
2245 struct drm_device
*dev
= fb_helper
->dev
;
2246 struct fb_info
*info
;
2249 if (!drm_fbdev_emulation
)
2252 mutex_lock(&dev
->mode_config
.mutex
);
2253 drm_setup_crtcs(fb_helper
,
2254 dev
->mode_config
.max_width
,
2255 dev
->mode_config
.max_height
);
2256 ret
= drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
2257 mutex_unlock(&dev
->mode_config
.mutex
);
2261 info
= fb_helper
->fbdev
;
2262 info
->var
.pixclock
= 0;
2263 ret
= register_framebuffer(info
);
2267 dev_info(dev
->dev
, "fb%d: %s frame buffer device\n",
2268 info
->node
, info
->fix
.id
);
2270 mutex_lock(&kernel_fb_helper_lock
);
2271 if (list_empty(&kernel_fb_helper_list
))
2272 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
2274 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
2275 mutex_unlock(&kernel_fb_helper_lock
);
2279 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
2282 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2283 * probing all the outputs attached to the fb
2284 * @fb_helper: the drm_fb_helper
2286 * Scan the connectors attached to the fb_helper and try to put together a
2287 * setup after notification of a change in output configuration.
2289 * Called at runtime, takes the mode config locks to be able to check/change the
2290 * modeset configuration. Must be run from process context (which usually means
2291 * either the output polling work or a work item launched from the driver's
2292 * hotplug interrupt).
2294 * Note that drivers may call this even before calling
2295 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2296 * for a race-free fbcon setup and will make sure that the fbdev emulation will
2297 * not miss any hotplug events.
2300 * 0 on success and a non-zero error code otherwise.
2302 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
2304 struct drm_device
*dev
= fb_helper
->dev
;
2306 if (!drm_fbdev_emulation
)
2309 mutex_lock(&dev
->mode_config
.mutex
);
2310 if (!fb_helper
->fb
|| !drm_fb_helper_is_bound(fb_helper
)) {
2311 fb_helper
->delayed_hotplug
= true;
2312 mutex_unlock(&dev
->mode_config
.mutex
);
2315 DRM_DEBUG_KMS("\n");
2317 drm_setup_crtcs(fb_helper
, fb_helper
->fb
->width
, fb_helper
->fb
->height
);
2319 mutex_unlock(&dev
->mode_config
.mutex
);
2321 drm_fb_helper_set_par(fb_helper
->fbdev
);
2325 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
2327 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2328 * but the module doesn't depend on any fb console symbols. At least
2329 * attempt to load fbcon to avoid leaving the system without a usable console.
2331 int __init
drm_fb_helper_modinit(void)
2333 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2334 const char *name
= "fbcon";
2335 struct module
*fbcon
;
2337 mutex_lock(&module_mutex
);
2338 fbcon
= find_module(name
);
2339 mutex_unlock(&module_mutex
);
2342 request_module_nowait(name
);
2346 EXPORT_SYMBOL(drm_fb_helper_modinit
);