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() after the fbdev device is
67 * unregisters using drm_fb_helper_unregister_fbi().
69 * At runtime drivers should restore the fbdev console by calling
70 * drm_fb_helper_restore_fbdev_mode_unlocked() from their &drm_driver.lastclose
71 * callback. They should also notify the fb helper code from updates to the
72 * output configuration by calling drm_fb_helper_hotplug_event(). For easier
73 * integration with the output polling code in drm_crtc_helper.c the modeset
74 * code provides a &drm_mode_config_funcs.output_poll_changed callback.
76 * All other functions exported by the fb helper library can be used to
77 * implement the fbdev driver interface by the driver.
79 * It is possible, though perhaps somewhat tricky, to implement race-free
80 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
81 * helper must be called first to initialize the minimum required to make
82 * hotplug detection work. Drivers also need to make sure to properly set up
83 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
84 * it is safe to enable interrupts and start processing hotplug events. At the
85 * same time, drivers should initialize all modeset objects such as CRTCs,
86 * encoders and connectors. To finish up the fbdev helper initialization, the
87 * drm_fb_helper_init() function is called. To probe for all attached displays
88 * and set up an initial configuration using the detected hardware, drivers
89 * should call drm_fb_helper_single_add_all_connectors() followed by
90 * drm_fb_helper_initial_config().
92 * If &drm_framebuffer_funcs.dirty is set, the
93 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
94 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right
95 * away. This worker then calls the dirty() function ensuring that it will
96 * always run in process context since the fb_*() function could be running in
97 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
98 * callback it will also schedule dirty_work with the damage collected from the
102 #define drm_fb_helper_for_each_connector(fbh, i__) \
103 for (({ lockdep_assert_held(&(fbh)->dev->mode_config.mutex); }), \
104 i__ = 0; i__ < (fbh)->connector_count; i__++)
107 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
109 * @fb_helper: fbdev initialized with drm_fb_helper_init
111 * This functions adds all the available connectors for use with the given
112 * fb_helper. This is a separate step to allow drivers to freely assign
113 * connectors to the fbdev, e.g. if some are reserved for special purposes or
114 * not adequate to be used for the fbcon.
116 * This function is protected against concurrent connector hotadds/removals
117 * using drm_fb_helper_add_one_connector() and
118 * drm_fb_helper_remove_one_connector().
120 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper
*fb_helper
)
122 struct drm_device
*dev
= fb_helper
->dev
;
123 struct drm_connector
*connector
;
124 struct drm_connector_list_iter conn_iter
;
127 if (!drm_fbdev_emulation
)
130 mutex_lock(&dev
->mode_config
.mutex
);
131 drm_connector_list_iter_get(dev
, &conn_iter
);
132 drm_for_each_connector_iter(connector
, &conn_iter
) {
133 ret
= drm_fb_helper_add_one_connector(fb_helper
, connector
);
141 drm_fb_helper_for_each_connector(fb_helper
, i
) {
142 struct drm_fb_helper_connector
*fb_helper_connector
=
143 fb_helper
->connector_info
[i
];
145 drm_connector_unreference(fb_helper_connector
->connector
);
147 kfree(fb_helper_connector
);
148 fb_helper
->connector_info
[i
] = NULL
;
150 fb_helper
->connector_count
= 0;
152 drm_connector_list_iter_put(&conn_iter
);
153 mutex_unlock(&dev
->mode_config
.mutex
);
157 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors
);
159 int drm_fb_helper_add_one_connector(struct drm_fb_helper
*fb_helper
, struct drm_connector
*connector
)
161 struct drm_fb_helper_connector
**temp
;
162 struct drm_fb_helper_connector
*fb_helper_connector
;
164 if (!drm_fbdev_emulation
)
167 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
168 if (fb_helper
->connector_count
+ 1 > fb_helper
->connector_info_alloc_count
) {
169 temp
= krealloc(fb_helper
->connector_info
, sizeof(struct drm_fb_helper_connector
*) * (fb_helper
->connector_count
+ 1), GFP_KERNEL
);
173 fb_helper
->connector_info_alloc_count
= fb_helper
->connector_count
+ 1;
174 fb_helper
->connector_info
= temp
;
178 fb_helper_connector
= kzalloc(sizeof(struct drm_fb_helper_connector
), GFP_KERNEL
);
179 if (!fb_helper_connector
)
182 drm_connector_reference(connector
);
183 fb_helper_connector
->connector
= connector
;
184 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_helper_connector
;
187 EXPORT_SYMBOL(drm_fb_helper_add_one_connector
);
189 int drm_fb_helper_remove_one_connector(struct drm_fb_helper
*fb_helper
,
190 struct drm_connector
*connector
)
192 struct drm_fb_helper_connector
*fb_helper_connector
;
195 if (!drm_fbdev_emulation
)
198 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
200 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
201 if (fb_helper
->connector_info
[i
]->connector
== connector
)
205 if (i
== fb_helper
->connector_count
)
207 fb_helper_connector
= fb_helper
->connector_info
[i
];
208 drm_connector_unreference(fb_helper_connector
->connector
);
210 for (j
= i
+ 1; j
< fb_helper
->connector_count
; j
++) {
211 fb_helper
->connector_info
[j
- 1] = fb_helper
->connector_info
[j
];
213 fb_helper
->connector_count
--;
214 kfree(fb_helper_connector
);
218 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector
);
220 static void drm_fb_helper_save_lut_atomic(struct drm_crtc
*crtc
, struct drm_fb_helper
*helper
)
222 uint16_t *r_base
, *g_base
, *b_base
;
225 if (helper
->funcs
->gamma_get
== NULL
)
228 r_base
= crtc
->gamma_store
;
229 g_base
= r_base
+ crtc
->gamma_size
;
230 b_base
= g_base
+ crtc
->gamma_size
;
232 for (i
= 0; i
< crtc
->gamma_size
; i
++)
233 helper
->funcs
->gamma_get(crtc
, &r_base
[i
], &g_base
[i
], &b_base
[i
], i
);
236 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc
*crtc
)
238 uint16_t *r_base
, *g_base
, *b_base
;
240 if (crtc
->funcs
->gamma_set
== NULL
)
243 r_base
= crtc
->gamma_store
;
244 g_base
= r_base
+ crtc
->gamma_size
;
245 b_base
= g_base
+ crtc
->gamma_size
;
247 crtc
->funcs
->gamma_set(crtc
, r_base
, g_base
, b_base
, crtc
->gamma_size
);
251 * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
252 * @info: fbdev registered by the helper
254 int drm_fb_helper_debug_enter(struct fb_info
*info
)
256 struct drm_fb_helper
*helper
= info
->par
;
257 const struct drm_crtc_helper_funcs
*funcs
;
260 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
261 for (i
= 0; i
< helper
->crtc_count
; i
++) {
262 struct drm_mode_set
*mode_set
=
263 &helper
->crtc_info
[i
].mode_set
;
265 if (!mode_set
->crtc
->enabled
)
268 funcs
= mode_set
->crtc
->helper_private
;
269 if (funcs
->mode_set_base_atomic
== NULL
)
272 drm_fb_helper_save_lut_atomic(mode_set
->crtc
, helper
);
273 funcs
->mode_set_base_atomic(mode_set
->crtc
,
277 ENTER_ATOMIC_MODE_SET
);
283 EXPORT_SYMBOL(drm_fb_helper_debug_enter
);
285 /* Find the real fb for a given fb helper CRTC */
286 static struct drm_framebuffer
*drm_mode_config_fb(struct drm_crtc
*crtc
)
288 struct drm_device
*dev
= crtc
->dev
;
291 drm_for_each_crtc(c
, dev
) {
292 if (crtc
->base
.id
== c
->base
.id
)
293 return c
->primary
->fb
;
300 * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
301 * @info: fbdev registered by the helper
303 int drm_fb_helper_debug_leave(struct fb_info
*info
)
305 struct drm_fb_helper
*helper
= info
->par
;
306 struct drm_crtc
*crtc
;
307 const struct drm_crtc_helper_funcs
*funcs
;
308 struct drm_framebuffer
*fb
;
311 for (i
= 0; i
< helper
->crtc_count
; i
++) {
312 struct drm_mode_set
*mode_set
= &helper
->crtc_info
[i
].mode_set
;
313 crtc
= mode_set
->crtc
;
314 funcs
= crtc
->helper_private
;
315 fb
= drm_mode_config_fb(crtc
);
321 DRM_ERROR("no fb to restore??\n");
325 if (funcs
->mode_set_base_atomic
== NULL
)
328 drm_fb_helper_restore_lut_atomic(mode_set
->crtc
);
329 funcs
->mode_set_base_atomic(mode_set
->crtc
, fb
, crtc
->x
,
330 crtc
->y
, LEAVE_ATOMIC_MODE_SET
);
335 EXPORT_SYMBOL(drm_fb_helper_debug_leave
);
337 static int restore_fbdev_mode_atomic(struct drm_fb_helper
*fb_helper
)
339 struct drm_device
*dev
= fb_helper
->dev
;
340 struct drm_plane
*plane
;
341 struct drm_atomic_state
*state
;
345 state
= drm_atomic_state_alloc(dev
);
349 state
->acquire_ctx
= dev
->mode_config
.acquire_ctx
;
352 drm_for_each_plane(plane
, dev
) {
353 struct drm_plane_state
*plane_state
;
355 plane_state
= drm_atomic_get_plane_state(state
, plane
);
356 if (IS_ERR(plane_state
)) {
357 ret
= PTR_ERR(plane_state
);
361 plane_state
->rotation
= DRM_ROTATE_0
;
363 plane
->old_fb
= plane
->fb
;
364 plane_mask
|= 1 << drm_plane_index(plane
);
366 /* disable non-primary: */
367 if (plane
->type
== DRM_PLANE_TYPE_PRIMARY
)
370 ret
= __drm_atomic_helper_disable_plane(plane
, plane_state
);
375 for(i
= 0; i
< fb_helper
->crtc_count
; i
++) {
376 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
378 ret
= __drm_atomic_helper_set_config(mode_set
, state
);
383 ret
= drm_atomic_commit(state
);
386 drm_atomic_clean_old_fb(dev
, plane_mask
, ret
);
391 drm_atomic_state_put(state
);
395 drm_atomic_state_clear(state
);
396 drm_atomic_legacy_backoff(state
);
401 static int restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
403 struct drm_device
*dev
= fb_helper
->dev
;
404 struct drm_plane
*plane
;
407 drm_warn_on_modeset_not_all_locked(dev
);
409 if (drm_drv_uses_atomic_modeset(dev
))
410 return restore_fbdev_mode_atomic(fb_helper
);
412 drm_for_each_plane(plane
, dev
) {
413 if (plane
->type
!= DRM_PLANE_TYPE_PRIMARY
)
414 drm_plane_force_disable(plane
);
416 if (plane
->rotation_property
)
417 drm_mode_plane_set_obj_prop(plane
,
418 plane
->rotation_property
,
422 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
423 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
424 struct drm_crtc
*crtc
= mode_set
->crtc
;
427 if (crtc
->funcs
->cursor_set2
) {
428 ret
= crtc
->funcs
->cursor_set2(crtc
, NULL
, 0, 0, 0, 0, 0);
431 } else if (crtc
->funcs
->cursor_set
) {
432 ret
= crtc
->funcs
->cursor_set(crtc
, NULL
, 0, 0, 0);
437 ret
= drm_mode_set_config_internal(mode_set
);
446 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
447 * @fb_helper: fbcon to restore
449 * This should be called from driver's drm &drm_driver.lastclose callback
450 * when implementing an fbcon on top of kms using this helper. This ensures that
451 * the user isn't greeted with a black screen when e.g. X dies.
454 * Zero if everything went ok, negative error code otherwise.
456 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper
*fb_helper
)
458 struct drm_device
*dev
= fb_helper
->dev
;
462 if (!drm_fbdev_emulation
)
465 drm_modeset_lock_all(dev
);
466 ret
= restore_fbdev_mode(fb_helper
);
468 do_delayed
= fb_helper
->delayed_hotplug
;
470 fb_helper
->delayed_hotplug
= false;
471 drm_modeset_unlock_all(dev
);
474 drm_fb_helper_hotplug_event(fb_helper
);
477 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked
);
479 static bool drm_fb_helper_is_bound(struct drm_fb_helper
*fb_helper
)
481 struct drm_device
*dev
= fb_helper
->dev
;
482 struct drm_crtc
*crtc
;
483 int bound
= 0, crtcs_bound
= 0;
485 /* Sometimes user space wants everything disabled, so don't steal the
486 * display if there's a master. */
487 if (READ_ONCE(dev
->master
))
490 drm_for_each_crtc(crtc
, dev
) {
491 if (crtc
->primary
->fb
)
493 if (crtc
->primary
->fb
== fb_helper
->fb
)
497 if (bound
< crtcs_bound
)
503 #ifdef CONFIG_MAGIC_SYSRQ
505 * restore fbcon display for all kms driver's using this helper, used for sysrq
506 * and panic handling.
508 static bool drm_fb_helper_force_kernel_mode(void)
510 bool ret
, error
= false;
511 struct drm_fb_helper
*helper
;
513 if (list_empty(&kernel_fb_helper_list
))
516 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
517 struct drm_device
*dev
= helper
->dev
;
519 if (dev
->switch_power_state
== DRM_SWITCH_POWER_OFF
)
522 drm_modeset_lock_all(dev
);
523 ret
= restore_fbdev_mode(helper
);
526 drm_modeset_unlock_all(dev
);
531 static void drm_fb_helper_restore_work_fn(struct work_struct
*ignored
)
534 ret
= drm_fb_helper_force_kernel_mode();
536 DRM_ERROR("Failed to restore crtc configuration\n");
538 static DECLARE_WORK(drm_fb_helper_restore_work
, drm_fb_helper_restore_work_fn
);
540 static void drm_fb_helper_sysrq(int dummy1
)
542 schedule_work(&drm_fb_helper_restore_work
);
545 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
546 .handler
= drm_fb_helper_sysrq
,
547 .help_msg
= "force-fb(V)",
548 .action_msg
= "Restore framebuffer console",
551 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= { };
554 static void drm_fb_helper_dpms(struct fb_info
*info
, int dpms_mode
)
556 struct drm_fb_helper
*fb_helper
= info
->par
;
557 struct drm_device
*dev
= fb_helper
->dev
;
558 struct drm_crtc
*crtc
;
559 struct drm_connector
*connector
;
563 * For each CRTC in this fb, turn the connectors on/off.
565 drm_modeset_lock_all(dev
);
566 if (!drm_fb_helper_is_bound(fb_helper
)) {
567 drm_modeset_unlock_all(dev
);
571 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
572 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
577 /* Walk the connectors & encoders on this fb turning them on/off */
578 drm_fb_helper_for_each_connector(fb_helper
, j
) {
579 connector
= fb_helper
->connector_info
[j
]->connector
;
580 connector
->funcs
->dpms(connector
, dpms_mode
);
581 drm_object_property_set_value(&connector
->base
,
582 dev
->mode_config
.dpms_property
, dpms_mode
);
585 drm_modeset_unlock_all(dev
);
589 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank
590 * @blank: desired blanking state
591 * @info: fbdev registered by the helper
593 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
595 if (oops_in_progress
)
599 /* Display: On; HSync: On, VSync: On */
600 case FB_BLANK_UNBLANK
:
601 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
603 /* Display: Off; HSync: On, VSync: On */
604 case FB_BLANK_NORMAL
:
605 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
607 /* Display: Off; HSync: Off, VSync: On */
608 case FB_BLANK_HSYNC_SUSPEND
:
609 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
611 /* Display: Off; HSync: On, VSync: Off */
612 case FB_BLANK_VSYNC_SUSPEND
:
613 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
615 /* Display: Off; HSync: Off, VSync: Off */
616 case FB_BLANK_POWERDOWN
:
617 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
622 EXPORT_SYMBOL(drm_fb_helper_blank
);
624 static void drm_fb_helper_modeset_release(struct drm_fb_helper
*helper
,
625 struct drm_mode_set
*modeset
)
629 for (i
= 0; i
< modeset
->num_connectors
; i
++) {
630 drm_connector_unreference(modeset
->connectors
[i
]);
631 modeset
->connectors
[i
] = NULL
;
633 modeset
->num_connectors
= 0;
635 drm_mode_destroy(helper
->dev
, modeset
->mode
);
636 modeset
->mode
= NULL
;
638 /* FIXME should hold a ref? */
642 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
646 for (i
= 0; i
< helper
->connector_count
; i
++) {
647 drm_connector_unreference(helper
->connector_info
[i
]->connector
);
648 kfree(helper
->connector_info
[i
]);
650 kfree(helper
->connector_info
);
652 for (i
= 0; i
< helper
->crtc_count
; i
++) {
653 struct drm_mode_set
*modeset
= &helper
->crtc_info
[i
].mode_set
;
655 drm_fb_helper_modeset_release(helper
, modeset
);
656 kfree(modeset
->connectors
);
658 kfree(helper
->crtc_info
);
661 static void drm_fb_helper_resume_worker(struct work_struct
*work
)
663 struct drm_fb_helper
*helper
= container_of(work
, struct drm_fb_helper
,
667 fb_set_suspend(helper
->fbdev
, 0);
671 static void drm_fb_helper_dirty_work(struct work_struct
*work
)
673 struct drm_fb_helper
*helper
= container_of(work
, struct drm_fb_helper
,
675 struct drm_clip_rect
*clip
= &helper
->dirty_clip
;
676 struct drm_clip_rect clip_copy
;
679 spin_lock_irqsave(&helper
->dirty_lock
, flags
);
681 clip
->x1
= clip
->y1
= ~0;
682 clip
->x2
= clip
->y2
= 0;
683 spin_unlock_irqrestore(&helper
->dirty_lock
, flags
);
685 /* call dirty callback only when it has been really touched */
686 if (clip_copy
.x1
< clip_copy
.x2
&& clip_copy
.y1
< clip_copy
.y2
)
687 helper
->fb
->funcs
->dirty(helper
->fb
, NULL
, 0, 0, &clip_copy
, 1);
691 * drm_fb_helper_prepare - setup a drm_fb_helper structure
693 * @helper: driver-allocated fbdev helper structure to set up
694 * @funcs: pointer to structure of functions associate with this helper
696 * Sets up the bare minimum to make the framebuffer helper usable. This is
697 * useful to implement race-free initialization of the polling helpers.
699 void drm_fb_helper_prepare(struct drm_device
*dev
, struct drm_fb_helper
*helper
,
700 const struct drm_fb_helper_funcs
*funcs
)
702 INIT_LIST_HEAD(&helper
->kernel_fb_list
);
703 spin_lock_init(&helper
->dirty_lock
);
704 INIT_WORK(&helper
->resume_work
, drm_fb_helper_resume_worker
);
705 INIT_WORK(&helper
->dirty_work
, drm_fb_helper_dirty_work
);
706 helper
->dirty_clip
.x1
= helper
->dirty_clip
.y1
= ~0;
707 helper
->funcs
= funcs
;
710 EXPORT_SYMBOL(drm_fb_helper_prepare
);
713 * drm_fb_helper_init - initialize a &struct drm_fb_helper
715 * @fb_helper: driver-allocated fbdev helper structure to initialize
716 * @max_conn_count: max connector count
718 * This allocates the structures for the fbdev helper with the given limits.
719 * Note that this won't yet touch the hardware (through the driver interfaces)
720 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
721 * to allow driver writes more control over the exact init sequence.
723 * Drivers must call drm_fb_helper_prepare() before calling this function.
726 * Zero if everything went ok, nonzero otherwise.
728 int drm_fb_helper_init(struct drm_device
*dev
,
729 struct drm_fb_helper
*fb_helper
,
732 struct drm_crtc
*crtc
;
733 struct drm_mode_config
*config
= &dev
->mode_config
;
736 if (!drm_fbdev_emulation
)
742 fb_helper
->crtc_info
= kcalloc(config
->num_crtc
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
743 if (!fb_helper
->crtc_info
)
746 fb_helper
->crtc_count
= config
->num_crtc
;
747 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
748 if (!fb_helper
->connector_info
) {
749 kfree(fb_helper
->crtc_info
);
752 fb_helper
->connector_info_alloc_count
= dev
->mode_config
.num_connector
;
753 fb_helper
->connector_count
= 0;
755 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
756 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
757 kcalloc(max_conn_count
,
758 sizeof(struct drm_connector
*),
761 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
763 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
767 drm_for_each_crtc(crtc
, dev
) {
768 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
774 drm_fb_helper_crtc_free(fb_helper
);
777 EXPORT_SYMBOL(drm_fb_helper_init
);
780 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
781 * @fb_helper: driver-allocated fbdev helper
783 * A helper to alloc fb_info and the members cmap and apertures. Called
784 * by the driver within the fb_probe fb_helper callback function. Drivers do not
785 * need to release the allocated fb_info structure themselves, this is
786 * automatically done when calling drm_fb_helper_fini().
789 * fb_info pointer if things went okay, pointer containing error code
792 struct fb_info
*drm_fb_helper_alloc_fbi(struct drm_fb_helper
*fb_helper
)
794 struct device
*dev
= fb_helper
->dev
->dev
;
795 struct fb_info
*info
;
798 info
= framebuffer_alloc(0, dev
);
800 return ERR_PTR(-ENOMEM
);
802 ret
= fb_alloc_cmap(&info
->cmap
, 256, 0);
806 info
->apertures
= alloc_apertures(1);
807 if (!info
->apertures
) {
812 fb_helper
->fbdev
= info
;
817 fb_dealloc_cmap(&info
->cmap
);
819 framebuffer_release(info
);
822 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi
);
825 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
826 * @fb_helper: driver-allocated fbdev helper
828 * A wrapper around unregister_framebuffer, to release the fb_info
829 * framebuffer device. This must be called before releasing all resources for
830 * @fb_helper by calling drm_fb_helper_fini().
832 void drm_fb_helper_unregister_fbi(struct drm_fb_helper
*fb_helper
)
834 if (fb_helper
&& fb_helper
->fbdev
)
835 unregister_framebuffer(fb_helper
->fbdev
);
837 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi
);
840 * drm_fb_helper_fini - finialize a &struct drm_fb_helper
841 * @fb_helper: driver-allocated fbdev helper
843 * This cleans up all remaining resources associated with @fb_helper. Must be
844 * called after drm_fb_helper_unlink_fbi() was called.
846 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
848 struct fb_info
*info
;
850 if (!drm_fbdev_emulation
|| !fb_helper
)
853 info
= fb_helper
->fbdev
;
856 fb_dealloc_cmap(&info
->cmap
);
857 framebuffer_release(info
);
859 fb_helper
->fbdev
= NULL
;
861 cancel_work_sync(&fb_helper
->resume_work
);
862 cancel_work_sync(&fb_helper
->dirty_work
);
864 mutex_lock(&kernel_fb_helper_lock
);
865 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
866 list_del(&fb_helper
->kernel_fb_list
);
867 if (list_empty(&kernel_fb_helper_list
)) {
868 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
871 mutex_unlock(&kernel_fb_helper_lock
);
873 drm_fb_helper_crtc_free(fb_helper
);
876 EXPORT_SYMBOL(drm_fb_helper_fini
);
879 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
880 * @fb_helper: driver-allocated fbdev helper
882 * A wrapper around unlink_framebuffer implemented by fbdev core
884 void drm_fb_helper_unlink_fbi(struct drm_fb_helper
*fb_helper
)
886 if (fb_helper
&& fb_helper
->fbdev
)
887 unlink_framebuffer(fb_helper
->fbdev
);
889 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi
);
891 static void drm_fb_helper_dirty(struct fb_info
*info
, u32 x
, u32 y
,
892 u32 width
, u32 height
)
894 struct drm_fb_helper
*helper
= info
->par
;
895 struct drm_clip_rect
*clip
= &helper
->dirty_clip
;
898 if (!helper
->fb
->funcs
->dirty
)
901 spin_lock_irqsave(&helper
->dirty_lock
, flags
);
902 clip
->x1
= min_t(u32
, clip
->x1
, x
);
903 clip
->y1
= min_t(u32
, clip
->y1
, y
);
904 clip
->x2
= max_t(u32
, clip
->x2
, x
+ width
);
905 clip
->y2
= max_t(u32
, clip
->y2
, y
+ height
);
906 spin_unlock_irqrestore(&helper
->dirty_lock
, flags
);
908 schedule_work(&helper
->dirty_work
);
912 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
913 * @info: fb_info struct pointer
914 * @pagelist: list of dirty mmap framebuffer pages
916 * This function is used as the &fb_deferred_io.deferred_io
917 * callback function for flushing the fbdev mmap writes.
919 void drm_fb_helper_deferred_io(struct fb_info
*info
,
920 struct list_head
*pagelist
)
922 unsigned long start
, end
, min
, max
;
928 list_for_each_entry(page
, pagelist
, lru
) {
929 start
= page
->index
<< PAGE_SHIFT
;
930 end
= start
+ PAGE_SIZE
- 1;
931 min
= min(min
, start
);
936 y1
= min
/ info
->fix
.line_length
;
937 y2
= min_t(u32
, DIV_ROUND_UP(max
, info
->fix
.line_length
),
939 drm_fb_helper_dirty(info
, 0, y1
, info
->var
.xres
, y2
- y1
);
942 EXPORT_SYMBOL(drm_fb_helper_deferred_io
);
945 * drm_fb_helper_sys_read - wrapper around fb_sys_read
946 * @info: fb_info struct pointer
947 * @buf: userspace buffer to read from framebuffer memory
948 * @count: number of bytes to read from framebuffer memory
949 * @ppos: read offset within framebuffer memory
951 * A wrapper around fb_sys_read implemented by fbdev core
953 ssize_t
drm_fb_helper_sys_read(struct fb_info
*info
, char __user
*buf
,
954 size_t count
, loff_t
*ppos
)
956 return fb_sys_read(info
, buf
, count
, ppos
);
958 EXPORT_SYMBOL(drm_fb_helper_sys_read
);
961 * drm_fb_helper_sys_write - wrapper around fb_sys_write
962 * @info: fb_info struct pointer
963 * @buf: userspace buffer to write to framebuffer memory
964 * @count: number of bytes to write to framebuffer memory
965 * @ppos: write offset within framebuffer memory
967 * A wrapper around fb_sys_write implemented by fbdev core
969 ssize_t
drm_fb_helper_sys_write(struct fb_info
*info
, const char __user
*buf
,
970 size_t count
, loff_t
*ppos
)
974 ret
= fb_sys_write(info
, buf
, count
, ppos
);
976 drm_fb_helper_dirty(info
, 0, 0, info
->var
.xres
,
981 EXPORT_SYMBOL(drm_fb_helper_sys_write
);
984 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
985 * @info: fbdev registered by the helper
986 * @rect: info about rectangle to fill
988 * A wrapper around sys_fillrect implemented by fbdev core
990 void drm_fb_helper_sys_fillrect(struct fb_info
*info
,
991 const struct fb_fillrect
*rect
)
993 sys_fillrect(info
, rect
);
994 drm_fb_helper_dirty(info
, rect
->dx
, rect
->dy
,
995 rect
->width
, rect
->height
);
997 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect
);
1000 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
1001 * @info: fbdev registered by the helper
1002 * @area: info about area to copy
1004 * A wrapper around sys_copyarea implemented by fbdev core
1006 void drm_fb_helper_sys_copyarea(struct fb_info
*info
,
1007 const struct fb_copyarea
*area
)
1009 sys_copyarea(info
, area
);
1010 drm_fb_helper_dirty(info
, area
->dx
, area
->dy
,
1011 area
->width
, area
->height
);
1013 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea
);
1016 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
1017 * @info: fbdev registered by the helper
1018 * @image: info about image to blit
1020 * A wrapper around sys_imageblit implemented by fbdev core
1022 void drm_fb_helper_sys_imageblit(struct fb_info
*info
,
1023 const struct fb_image
*image
)
1025 sys_imageblit(info
, image
);
1026 drm_fb_helper_dirty(info
, image
->dx
, image
->dy
,
1027 image
->width
, image
->height
);
1029 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit
);
1032 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
1033 * @info: fbdev registered by the helper
1034 * @rect: info about rectangle to fill
1036 * A wrapper around cfb_imageblit implemented by fbdev core
1038 void drm_fb_helper_cfb_fillrect(struct fb_info
*info
,
1039 const struct fb_fillrect
*rect
)
1041 cfb_fillrect(info
, rect
);
1042 drm_fb_helper_dirty(info
, rect
->dx
, rect
->dy
,
1043 rect
->width
, rect
->height
);
1045 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect
);
1048 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
1049 * @info: fbdev registered by the helper
1050 * @area: info about area to copy
1052 * A wrapper around cfb_copyarea implemented by fbdev core
1054 void drm_fb_helper_cfb_copyarea(struct fb_info
*info
,
1055 const struct fb_copyarea
*area
)
1057 cfb_copyarea(info
, area
);
1058 drm_fb_helper_dirty(info
, area
->dx
, area
->dy
,
1059 area
->width
, area
->height
);
1061 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea
);
1064 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1065 * @info: fbdev registered by the helper
1066 * @image: info about image to blit
1068 * A wrapper around cfb_imageblit implemented by fbdev core
1070 void drm_fb_helper_cfb_imageblit(struct fb_info
*info
,
1071 const struct fb_image
*image
)
1073 cfb_imageblit(info
, image
);
1074 drm_fb_helper_dirty(info
, image
->dx
, image
->dy
,
1075 image
->width
, image
->height
);
1077 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit
);
1080 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1081 * @fb_helper: driver-allocated fbdev helper
1082 * @suspend: whether to suspend or resume
1084 * A wrapper around fb_set_suspend implemented by fbdev core.
1085 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
1088 void drm_fb_helper_set_suspend(struct drm_fb_helper
*fb_helper
, bool suspend
)
1090 if (fb_helper
&& fb_helper
->fbdev
)
1091 fb_set_suspend(fb_helper
->fbdev
, suspend
);
1093 EXPORT_SYMBOL(drm_fb_helper_set_suspend
);
1096 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
1097 * takes the console lock
1098 * @fb_helper: driver-allocated fbdev helper
1099 * @suspend: whether to suspend or resume
1101 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
1102 * isn't available on resume, a worker is tasked with waiting for the lock
1103 * to become available. The console lock can be pretty contented on resume
1104 * due to all the printk activity.
1106 * This function can be called multiple times with the same state since
1107 * &fb_info.state is checked to see if fbdev is running or not before locking.
1109 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
1111 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper
*fb_helper
,
1114 if (!fb_helper
|| !fb_helper
->fbdev
)
1117 /* make sure there's no pending/ongoing resume */
1118 flush_work(&fb_helper
->resume_work
);
1121 if (fb_helper
->fbdev
->state
!= FBINFO_STATE_RUNNING
)
1127 if (fb_helper
->fbdev
->state
== FBINFO_STATE_RUNNING
)
1130 if (!console_trylock()) {
1131 schedule_work(&fb_helper
->resume_work
);
1136 fb_set_suspend(fb_helper
->fbdev
, suspend
);
1139 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked
);
1141 static int setcolreg(struct drm_crtc
*crtc
, u16 red
, u16 green
,
1142 u16 blue
, u16 regno
, struct fb_info
*info
)
1144 struct drm_fb_helper
*fb_helper
= info
->par
;
1145 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1147 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
) {
1150 /* place color in psuedopalette */
1153 palette
= (u32
*)info
->pseudo_palette
;
1154 red
>>= (16 - info
->var
.red
.length
);
1155 green
>>= (16 - info
->var
.green
.length
);
1156 blue
>>= (16 - info
->var
.blue
.length
);
1157 value
= (red
<< info
->var
.red
.offset
) |
1158 (green
<< info
->var
.green
.offset
) |
1159 (blue
<< info
->var
.blue
.offset
);
1160 if (info
->var
.transp
.length
> 0) {
1161 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
1162 mask
<<= info
->var
.transp
.offset
;
1165 palette
[regno
] = value
;
1170 * The driver really shouldn't advertise pseudo/directcolor
1171 * visuals if it can't deal with the palette.
1173 if (WARN_ON(!fb_helper
->funcs
->gamma_set
||
1174 !fb_helper
->funcs
->gamma_get
))
1177 WARN_ON(fb
->format
->cpp
[0] != 1);
1179 fb_helper
->funcs
->gamma_set(crtc
, red
, green
, blue
, regno
);
1185 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
1186 * @cmap: cmap to set
1187 * @info: fbdev registered by the helper
1189 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
1191 struct drm_fb_helper
*fb_helper
= info
->par
;
1192 struct drm_device
*dev
= fb_helper
->dev
;
1193 const struct drm_crtc_helper_funcs
*crtc_funcs
;
1194 u16
*red
, *green
, *blue
, *transp
;
1195 struct drm_crtc
*crtc
;
1199 if (oops_in_progress
)
1202 drm_modeset_lock_all(dev
);
1203 if (!drm_fb_helper_is_bound(fb_helper
)) {
1204 drm_modeset_unlock_all(dev
);
1208 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1209 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
1210 crtc_funcs
= crtc
->helper_private
;
1213 green
= cmap
->green
;
1215 transp
= cmap
->transp
;
1216 start
= cmap
->start
;
1218 for (j
= 0; j
< cmap
->len
; j
++) {
1219 u16 hred
, hgreen
, hblue
, htransp
= 0xffff;
1226 htransp
= *transp
++;
1228 rc
= setcolreg(crtc
, hred
, hgreen
, hblue
, start
++, info
);
1232 if (crtc_funcs
->load_lut
)
1233 crtc_funcs
->load_lut(crtc
);
1236 drm_modeset_unlock_all(dev
);
1239 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
1242 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
1243 * @var: screeninfo to check
1244 * @info: fbdev registered by the helper
1246 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
1247 struct fb_info
*info
)
1249 struct drm_fb_helper
*fb_helper
= info
->par
;
1250 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1253 if (var
->pixclock
!= 0 || in_dbg_master())
1257 * Changes struct fb_var_screeninfo are currently not pushed back
1258 * to KMS, hence fail if different settings are requested.
1260 if (var
->bits_per_pixel
!= fb
->format
->cpp
[0] * 8 ||
1261 var
->xres
!= fb
->width
|| var
->yres
!= fb
->height
||
1262 var
->xres_virtual
!= fb
->width
|| var
->yres_virtual
!= fb
->height
) {
1263 DRM_DEBUG("fb userspace requested width/height/bpp different than current fb "
1264 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1265 var
->xres
, var
->yres
, var
->bits_per_pixel
,
1266 var
->xres_virtual
, var
->yres_virtual
,
1267 fb
->width
, fb
->height
, fb
->format
->cpp
[0] * 8);
1271 switch (var
->bits_per_pixel
) {
1273 depth
= (var
->green
.length
== 6) ? 16 : 15;
1276 depth
= (var
->transp
.length
> 0) ? 32 : 24;
1279 depth
= var
->bits_per_pixel
;
1285 var
->red
.offset
= 0;
1286 var
->green
.offset
= 0;
1287 var
->blue
.offset
= 0;
1288 var
->red
.length
= 8;
1289 var
->green
.length
= 8;
1290 var
->blue
.length
= 8;
1291 var
->transp
.length
= 0;
1292 var
->transp
.offset
= 0;
1295 var
->red
.offset
= 10;
1296 var
->green
.offset
= 5;
1297 var
->blue
.offset
= 0;
1298 var
->red
.length
= 5;
1299 var
->green
.length
= 5;
1300 var
->blue
.length
= 5;
1301 var
->transp
.length
= 1;
1302 var
->transp
.offset
= 15;
1305 var
->red
.offset
= 11;
1306 var
->green
.offset
= 5;
1307 var
->blue
.offset
= 0;
1308 var
->red
.length
= 5;
1309 var
->green
.length
= 6;
1310 var
->blue
.length
= 5;
1311 var
->transp
.length
= 0;
1312 var
->transp
.offset
= 0;
1315 var
->red
.offset
= 16;
1316 var
->green
.offset
= 8;
1317 var
->blue
.offset
= 0;
1318 var
->red
.length
= 8;
1319 var
->green
.length
= 8;
1320 var
->blue
.length
= 8;
1321 var
->transp
.length
= 0;
1322 var
->transp
.offset
= 0;
1325 var
->red
.offset
= 16;
1326 var
->green
.offset
= 8;
1327 var
->blue
.offset
= 0;
1328 var
->red
.length
= 8;
1329 var
->green
.length
= 8;
1330 var
->blue
.length
= 8;
1331 var
->transp
.length
= 8;
1332 var
->transp
.offset
= 24;
1339 EXPORT_SYMBOL(drm_fb_helper_check_var
);
1342 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
1343 * @info: fbdev registered by the helper
1345 * This will let fbcon do the mode init and is called at initialization time by
1346 * the fbdev core when registering the driver, and later on through the hotplug
1349 int drm_fb_helper_set_par(struct fb_info
*info
)
1351 struct drm_fb_helper
*fb_helper
= info
->par
;
1352 struct fb_var_screeninfo
*var
= &info
->var
;
1354 if (oops_in_progress
)
1357 if (var
->pixclock
!= 0) {
1358 DRM_ERROR("PIXEL CLOCK SET\n");
1362 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper
);
1366 EXPORT_SYMBOL(drm_fb_helper_set_par
);
1368 static int pan_display_atomic(struct fb_var_screeninfo
*var
,
1369 struct fb_info
*info
)
1371 struct drm_fb_helper
*fb_helper
= info
->par
;
1372 struct drm_device
*dev
= fb_helper
->dev
;
1373 struct drm_atomic_state
*state
;
1374 struct drm_plane
*plane
;
1376 unsigned plane_mask
;
1378 state
= drm_atomic_state_alloc(dev
);
1382 state
->acquire_ctx
= dev
->mode_config
.acquire_ctx
;
1385 for(i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1386 struct drm_mode_set
*mode_set
;
1388 mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
1390 mode_set
->x
= var
->xoffset
;
1391 mode_set
->y
= var
->yoffset
;
1393 ret
= __drm_atomic_helper_set_config(mode_set
, state
);
1397 plane
= mode_set
->crtc
->primary
;
1398 plane_mask
|= (1 << drm_plane_index(plane
));
1399 plane
->old_fb
= plane
->fb
;
1402 ret
= drm_atomic_commit(state
);
1406 info
->var
.xoffset
= var
->xoffset
;
1407 info
->var
.yoffset
= var
->yoffset
;
1410 drm_atomic_clean_old_fb(dev
, plane_mask
, ret
);
1412 if (ret
== -EDEADLK
)
1415 drm_atomic_state_put(state
);
1419 drm_atomic_state_clear(state
);
1420 drm_atomic_legacy_backoff(state
);
1426 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
1427 * @var: updated screen information
1428 * @info: fbdev registered by the helper
1430 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
1431 struct fb_info
*info
)
1433 struct drm_fb_helper
*fb_helper
= info
->par
;
1434 struct drm_device
*dev
= fb_helper
->dev
;
1435 struct drm_mode_set
*modeset
;
1439 if (oops_in_progress
)
1442 drm_modeset_lock_all(dev
);
1443 if (!drm_fb_helper_is_bound(fb_helper
)) {
1444 drm_modeset_unlock_all(dev
);
1448 if (drm_drv_uses_atomic_modeset(dev
)) {
1449 ret
= pan_display_atomic(var
, info
);
1453 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1454 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1456 modeset
->x
= var
->xoffset
;
1457 modeset
->y
= var
->yoffset
;
1459 if (modeset
->num_connectors
) {
1460 ret
= drm_mode_set_config_internal(modeset
);
1462 info
->var
.xoffset
= var
->xoffset
;
1463 info
->var
.yoffset
= var
->yoffset
;
1468 drm_modeset_unlock_all(dev
);
1471 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
1474 * Allocates the backing storage and sets up the fbdev info structure through
1475 * the ->fb_probe callback and then registers the fbdev and sets up the panic
1478 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
1484 struct drm_fb_helper_surface_size sizes
;
1487 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
1488 sizes
.surface_depth
= 24;
1489 sizes
.surface_bpp
= 32;
1490 sizes
.fb_width
= (unsigned)-1;
1491 sizes
.fb_height
= (unsigned)-1;
1493 /* if driver picks 8 or 16 by default use that
1494 for both depth/bpp */
1495 if (preferred_bpp
!= sizes
.surface_bpp
)
1496 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
1498 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1499 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1500 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
1501 struct drm_cmdline_mode
*cmdline_mode
;
1503 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
1505 if (cmdline_mode
->bpp_specified
) {
1506 switch (cmdline_mode
->bpp
) {
1508 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
1511 sizes
.surface_depth
= 15;
1512 sizes
.surface_bpp
= 16;
1515 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
1518 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
1521 sizes
.surface_depth
= 24;
1522 sizes
.surface_bpp
= 32;
1530 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1531 struct drm_display_mode
*desired_mode
;
1532 struct drm_mode_set
*mode_set
;
1534 /* in case of tile group, are we the last tile vert or horiz?
1535 * If no tile group you are always the last one both vertically
1538 bool lastv
= true, lasth
= true;
1540 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
1541 mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
1548 x
= fb_helper
->crtc_info
[i
].x
;
1549 y
= fb_helper
->crtc_info
[i
].y
;
1551 if (gamma_size
== 0)
1552 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
1554 sizes
.surface_width
= max_t(u32
, desired_mode
->hdisplay
+ x
, sizes
.surface_width
);
1555 sizes
.surface_height
= max_t(u32
, desired_mode
->vdisplay
+ y
, sizes
.surface_height
);
1557 for (j
= 0; j
< mode_set
->num_connectors
; j
++) {
1558 struct drm_connector
*connector
= mode_set
->connectors
[j
];
1559 if (connector
->has_tile
) {
1560 lasth
= (connector
->tile_h_loc
== (connector
->num_h_tile
- 1));
1561 lastv
= (connector
->tile_v_loc
== (connector
->num_v_tile
- 1));
1562 /* cloning to multiple tiles is just crazy-talk, so: */
1568 sizes
.fb_width
= min_t(u32
, desired_mode
->hdisplay
+ x
, sizes
.fb_width
);
1570 sizes
.fb_height
= min_t(u32
, desired_mode
->vdisplay
+ y
, sizes
.fb_height
);
1573 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
1574 /* hmm everyone went away - assume VGA cable just fell out
1575 and will come back later. */
1576 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1577 sizes
.fb_width
= sizes
.surface_width
= 1024;
1578 sizes
.fb_height
= sizes
.surface_height
= 768;
1581 /* push down into drivers */
1582 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
1587 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1588 * events, but at init time drm_setup_crtcs needs to be called before
1589 * the fb is allocated (since we need to figure out the desired size of
1590 * the fb before we can allocate it ...). Hence we need to fix things up
1593 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
1594 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
1595 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
1601 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1602 * @info: fbdev registered by the helper
1603 * @pitch: desired pitch
1604 * @depth: desired depth
1606 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1607 * fbdev emulations. Drivers which support acceleration methods which impose
1608 * additional constraints need to set up their own limits.
1610 * Drivers should call this (or their equivalent setup code) from their
1611 * &drm_fb_helper_funcs.fb_probe callback.
1613 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1616 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1617 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1618 FB_VISUAL_TRUECOLOR
;
1619 info
->fix
.mmio_start
= 0;
1620 info
->fix
.mmio_len
= 0;
1621 info
->fix
.type_aux
= 0;
1622 info
->fix
.xpanstep
= 1; /* doing it in hw */
1623 info
->fix
.ypanstep
= 1; /* doing it in hw */
1624 info
->fix
.ywrapstep
= 0;
1625 info
->fix
.accel
= FB_ACCEL_NONE
;
1627 info
->fix
.line_length
= pitch
;
1630 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1633 * drm_fb_helper_fill_var - initalizes variable fbdev information
1634 * @info: fbdev instance to set up
1635 * @fb_helper: fb helper instance to use as template
1636 * @fb_width: desired fb width
1637 * @fb_height: desired fb height
1639 * Sets up the variable fbdev metainformation from the given fb helper instance
1640 * and the drm framebuffer allocated in &drm_fb_helper.fb.
1642 * Drivers should call this (or their equivalent setup code) from their
1643 * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
1644 * backing storage framebuffer.
1646 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1647 uint32_t fb_width
, uint32_t fb_height
)
1649 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1650 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1651 info
->var
.xres_virtual
= fb
->width
;
1652 info
->var
.yres_virtual
= fb
->height
;
1653 info
->var
.bits_per_pixel
= fb
->format
->cpp
[0] * 8;
1654 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1655 info
->var
.xoffset
= 0;
1656 info
->var
.yoffset
= 0;
1657 info
->var
.activate
= FB_ACTIVATE_NOW
;
1658 info
->var
.height
= -1;
1659 info
->var
.width
= -1;
1661 switch (fb
->format
->depth
) {
1663 info
->var
.red
.offset
= 0;
1664 info
->var
.green
.offset
= 0;
1665 info
->var
.blue
.offset
= 0;
1666 info
->var
.red
.length
= 8; /* 8bit DAC */
1667 info
->var
.green
.length
= 8;
1668 info
->var
.blue
.length
= 8;
1669 info
->var
.transp
.offset
= 0;
1670 info
->var
.transp
.length
= 0;
1673 info
->var
.red
.offset
= 10;
1674 info
->var
.green
.offset
= 5;
1675 info
->var
.blue
.offset
= 0;
1676 info
->var
.red
.length
= 5;
1677 info
->var
.green
.length
= 5;
1678 info
->var
.blue
.length
= 5;
1679 info
->var
.transp
.offset
= 15;
1680 info
->var
.transp
.length
= 1;
1683 info
->var
.red
.offset
= 11;
1684 info
->var
.green
.offset
= 5;
1685 info
->var
.blue
.offset
= 0;
1686 info
->var
.red
.length
= 5;
1687 info
->var
.green
.length
= 6;
1688 info
->var
.blue
.length
= 5;
1689 info
->var
.transp
.offset
= 0;
1692 info
->var
.red
.offset
= 16;
1693 info
->var
.green
.offset
= 8;
1694 info
->var
.blue
.offset
= 0;
1695 info
->var
.red
.length
= 8;
1696 info
->var
.green
.length
= 8;
1697 info
->var
.blue
.length
= 8;
1698 info
->var
.transp
.offset
= 0;
1699 info
->var
.transp
.length
= 0;
1702 info
->var
.red
.offset
= 16;
1703 info
->var
.green
.offset
= 8;
1704 info
->var
.blue
.offset
= 0;
1705 info
->var
.red
.length
= 8;
1706 info
->var
.green
.length
= 8;
1707 info
->var
.blue
.length
= 8;
1708 info
->var
.transp
.offset
= 24;
1709 info
->var
.transp
.length
= 8;
1715 info
->var
.xres
= fb_width
;
1716 info
->var
.yres
= fb_height
;
1718 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1720 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1724 struct drm_connector
*connector
;
1728 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1729 connector
= fb_helper
->connector_info
[i
]->connector
;
1730 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1736 struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1738 struct drm_display_mode
*mode
;
1740 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1741 if (mode
->hdisplay
> width
||
1742 mode
->vdisplay
> height
)
1744 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1749 EXPORT_SYMBOL(drm_has_preferred_mode
);
1751 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1753 return fb_connector
->connector
->cmdline_mode
.specified
;
1756 struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
)
1758 struct drm_cmdline_mode
*cmdline_mode
;
1759 struct drm_display_mode
*mode
;
1760 bool prefer_non_interlace
;
1762 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
1763 if (cmdline_mode
->specified
== false)
1766 /* attempt to find a matching mode in the list of modes
1767 * we have gotten so far, if not add a CVT mode that conforms
1769 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1772 prefer_non_interlace
= !cmdline_mode
->interlace
;
1774 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1775 /* check width/height */
1776 if (mode
->hdisplay
!= cmdline_mode
->xres
||
1777 mode
->vdisplay
!= cmdline_mode
->yres
)
1780 if (cmdline_mode
->refresh_specified
) {
1781 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
1785 if (cmdline_mode
->interlace
) {
1786 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
1788 } else if (prefer_non_interlace
) {
1789 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
1795 if (prefer_non_interlace
) {
1796 prefer_non_interlace
= false;
1801 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
1803 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
1806 EXPORT_SYMBOL(drm_pick_cmdline_mode
);
1808 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
1813 enable
= connector
->status
== connector_status_connected
;
1815 enable
= connector
->status
!= connector_status_disconnected
;
1820 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
1823 bool any_enabled
= false;
1824 struct drm_connector
*connector
;
1827 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1828 connector
= fb_helper
->connector_info
[i
]->connector
;
1829 enabled
[i
] = drm_connector_enabled(connector
, true);
1830 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
1831 enabled
[i
] ? "yes" : "no");
1832 any_enabled
|= enabled
[i
];
1838 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1839 connector
= fb_helper
->connector_info
[i
]->connector
;
1840 enabled
[i
] = drm_connector_enabled(connector
, false);
1844 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
1845 struct drm_display_mode
**modes
,
1846 struct drm_fb_offset
*offsets
,
1847 bool *enabled
, int width
, int height
)
1850 bool can_clone
= false;
1851 struct drm_fb_helper_connector
*fb_helper_conn
;
1852 struct drm_display_mode
*dmt_mode
, *mode
;
1854 /* only contemplate cloning in the single crtc case */
1855 if (fb_helper
->crtc_count
> 1)
1859 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1864 /* only contemplate cloning if more than one connector is enabled */
1868 /* check the command line or if nothing common pick 1024x768 */
1870 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1873 fb_helper_conn
= fb_helper
->connector_info
[i
];
1874 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
);
1879 for (j
= 0; j
< i
; j
++) {
1882 if (!drm_mode_equal(modes
[j
], modes
[i
]))
1888 DRM_DEBUG_KMS("can clone using command line\n");
1892 /* try and find a 1024x768 mode on each connector */
1894 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
1896 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1900 fb_helper_conn
= fb_helper
->connector_info
[i
];
1901 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1902 if (drm_mode_equal(mode
, dmt_mode
))
1910 DRM_DEBUG_KMS("can clone using 1024x768\n");
1913 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1917 static int drm_get_tile_offsets(struct drm_fb_helper
*fb_helper
,
1918 struct drm_display_mode
**modes
,
1919 struct drm_fb_offset
*offsets
,
1921 int h_idx
, int v_idx
)
1923 struct drm_fb_helper_connector
*fb_helper_conn
;
1925 int hoffset
= 0, voffset
= 0;
1927 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1928 fb_helper_conn
= fb_helper
->connector_info
[i
];
1929 if (!fb_helper_conn
->connector
->has_tile
)
1932 if (!modes
[i
] && (h_idx
|| v_idx
)) {
1933 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i
,
1934 fb_helper_conn
->connector
->base
.id
);
1937 if (fb_helper_conn
->connector
->tile_h_loc
< h_idx
)
1938 hoffset
+= modes
[i
]->hdisplay
;
1940 if (fb_helper_conn
->connector
->tile_v_loc
< v_idx
)
1941 voffset
+= modes
[i
]->vdisplay
;
1943 offsets
[idx
].x
= hoffset
;
1944 offsets
[idx
].y
= voffset
;
1945 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset
, voffset
, h_idx
, v_idx
);
1949 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
1950 struct drm_display_mode
**modes
,
1951 struct drm_fb_offset
*offsets
,
1952 bool *enabled
, int width
, int height
)
1954 struct drm_fb_helper_connector
*fb_helper_conn
;
1955 const u64 mask
= BIT_ULL(fb_helper
->connector_count
) - 1;
1956 u64 conn_configured
= 0;
1961 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1962 fb_helper_conn
= fb_helper
->connector_info
[i
];
1964 if (conn_configured
& BIT_ULL(i
))
1967 if (enabled
[i
] == false) {
1968 conn_configured
|= BIT_ULL(i
);
1972 /* first pass over all the untiled connectors */
1973 if (tile_pass
== 0 && fb_helper_conn
->connector
->has_tile
)
1976 if (tile_pass
== 1) {
1977 if (fb_helper_conn
->connector
->tile_h_loc
!= 0 ||
1978 fb_helper_conn
->connector
->tile_v_loc
!= 0)
1982 if (fb_helper_conn
->connector
->tile_h_loc
!= tile_pass
-1 &&
1983 fb_helper_conn
->connector
->tile_v_loc
!= tile_pass
- 1)
1984 /* if this tile_pass doesn't cover any of the tiles - keep going */
1987 /* find the tile offsets for this pass - need
1988 to find all tiles left and above */
1989 drm_get_tile_offsets(fb_helper
, modes
, offsets
,
1990 i
, fb_helper_conn
->connector
->tile_h_loc
, fb_helper_conn
->connector
->tile_v_loc
);
1992 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1993 fb_helper_conn
->connector
->base
.id
);
1995 /* got for command line mode first */
1996 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
);
1998 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1999 fb_helper_conn
->connector
->base
.id
, fb_helper_conn
->connector
->tile_group
? fb_helper_conn
->connector
->tile_group
->id
: 0);
2000 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
2002 /* No preferred modes, pick one off the list */
2003 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
2004 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
2007 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
2009 conn_configured
|= BIT_ULL(i
);
2012 if ((conn_configured
& mask
) != mask
) {
2019 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
2020 struct drm_fb_helper_crtc
**best_crtcs
,
2021 struct drm_display_mode
**modes
,
2022 int n
, int width
, int height
)
2025 struct drm_connector
*connector
;
2026 const struct drm_connector_helper_funcs
*connector_funcs
;
2027 struct drm_encoder
*encoder
;
2028 int my_score
, best_score
, score
;
2029 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
2030 struct drm_fb_helper_connector
*fb_helper_conn
;
2032 if (n
== fb_helper
->connector_count
)
2035 fb_helper_conn
= fb_helper
->connector_info
[n
];
2036 connector
= fb_helper_conn
->connector
;
2038 best_crtcs
[n
] = NULL
;
2039 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
2040 if (modes
[n
] == NULL
)
2043 crtcs
= kzalloc(fb_helper
->connector_count
*
2044 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
2049 if (connector
->status
== connector_status_connected
)
2051 if (drm_has_cmdline_mode(fb_helper_conn
))
2053 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
2056 connector_funcs
= connector
->helper_private
;
2059 * If the DRM device implements atomic hooks and ->best_encoder() is
2060 * NULL we fallback to the default drm_atomic_helper_best_encoder()
2063 if (drm_drv_uses_atomic_modeset(fb_helper
->dev
) &&
2064 !connector_funcs
->best_encoder
)
2065 encoder
= drm_atomic_helper_best_encoder(connector
);
2067 encoder
= connector_funcs
->best_encoder(connector
);
2072 /* select a crtc for this connector and then attempt to configure
2073 remaining connectors */
2074 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
2075 crtc
= &fb_helper
->crtc_info
[c
];
2077 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
2080 for (o
= 0; o
< n
; o
++)
2081 if (best_crtcs
[o
] == crtc
)
2085 /* ignore cloning unless only a single crtc */
2086 if (fb_helper
->crtc_count
> 1)
2089 if (!drm_mode_equal(modes
[o
], modes
[n
]))
2094 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
2095 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
2097 if (score
> best_score
) {
2099 memcpy(best_crtcs
, crtcs
,
2100 fb_helper
->connector_count
*
2101 sizeof(struct drm_fb_helper_crtc
*));
2109 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
,
2110 u32 width
, u32 height
)
2112 struct drm_device
*dev
= fb_helper
->dev
;
2113 struct drm_fb_helper_crtc
**crtcs
;
2114 struct drm_display_mode
**modes
;
2115 struct drm_fb_offset
*offsets
;
2119 DRM_DEBUG_KMS("\n");
2120 if (drm_fb_helper_probe_connector_modes(fb_helper
, width
, height
) == 0)
2121 DRM_DEBUG_KMS("No connectors reported connected with modes\n");
2123 /* prevent concurrent modification of connector_count by hotplug */
2124 lockdep_assert_held(&fb_helper
->dev
->mode_config
.mutex
);
2126 crtcs
= kcalloc(fb_helper
->connector_count
,
2127 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
2128 modes
= kcalloc(fb_helper
->connector_count
,
2129 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
2130 offsets
= kcalloc(fb_helper
->connector_count
,
2131 sizeof(struct drm_fb_offset
), GFP_KERNEL
);
2132 enabled
= kcalloc(fb_helper
->connector_count
,
2133 sizeof(bool), GFP_KERNEL
);
2134 if (!crtcs
|| !modes
|| !enabled
|| !offsets
) {
2135 DRM_ERROR("Memory allocation failed\n");
2139 drm_enable_connectors(fb_helper
, enabled
);
2141 if (!(fb_helper
->funcs
->initial_config
&&
2142 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
2144 enabled
, width
, height
))) {
2145 memset(modes
, 0, fb_helper
->connector_count
*sizeof(modes
[0]));
2146 memset(crtcs
, 0, fb_helper
->connector_count
*sizeof(crtcs
[0]));
2147 memset(offsets
, 0, fb_helper
->connector_count
*sizeof(offsets
[0]));
2149 if (!drm_target_cloned(fb_helper
, modes
, offsets
,
2150 enabled
, width
, height
) &&
2151 !drm_target_preferred(fb_helper
, modes
, offsets
,
2152 enabled
, width
, height
))
2153 DRM_ERROR("Unable to find initial modes\n");
2155 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2158 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
2161 /* need to set the modesets up here for use later */
2162 /* fill out the connector<->crtc mappings into the modesets */
2163 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
2164 drm_fb_helper_modeset_release(fb_helper
,
2165 &fb_helper
->crtc_info
[i
].mode_set
);
2167 drm_fb_helper_for_each_connector(fb_helper
, i
) {
2168 struct drm_display_mode
*mode
= modes
[i
];
2169 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
2170 struct drm_fb_offset
*offset
= &offsets
[i
];
2171 struct drm_mode_set
*modeset
= &fb_crtc
->mode_set
;
2173 if (mode
&& fb_crtc
) {
2174 struct drm_connector
*connector
=
2175 fb_helper
->connector_info
[i
]->connector
;
2177 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2178 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
, offset
->x
, offset
->y
);
2180 fb_crtc
->desired_mode
= mode
;
2181 fb_crtc
->x
= offset
->x
;
2182 fb_crtc
->y
= offset
->y
;
2183 modeset
->mode
= drm_mode_duplicate(dev
,
2184 fb_crtc
->desired_mode
);
2185 drm_connector_reference(connector
);
2186 modeset
->connectors
[modeset
->num_connectors
++] = connector
;
2187 modeset
->fb
= fb_helper
->fb
;
2188 modeset
->x
= offset
->x
;
2189 modeset
->y
= offset
->y
;
2200 * drm_fb_helper_initial_config - setup a sane initial connector configuration
2201 * @fb_helper: fb_helper device struct
2202 * @bpp_sel: bpp value to use for the framebuffer configuration
2204 * Scans the CRTCs and connectors and tries to put together an initial setup.
2205 * At the moment, this is a cloned configuration across all heads with
2206 * a new framebuffer object as the backing store.
2208 * Note that this also registers the fbdev and so allows userspace to call into
2209 * the driver through the fbdev interfaces.
2211 * This function will call down into the &drm_fb_helper_funcs.fb_probe callback
2212 * to let the driver allocate and initialize the fbdev info structure and the
2213 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2214 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2215 * values for the fbdev info structure.
2219 * When you have fbcon support built-in or already loaded, this function will do
2220 * a full modeset to setup the fbdev console. Due to locking misdesign in the
2221 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2222 * console_lock. Until console_unlock is called no dmesg lines will be sent out
2223 * to consoles, not even serial console. This means when your driver crashes,
2224 * you will see absolutely nothing else but a system stuck in this function,
2225 * with no further output. Any kind of printk() you place within your own driver
2226 * or in the drm core modeset code will also never show up.
2228 * Standard debug practice is to run the fbcon setup without taking the
2229 * console_lock as a hack, to be able to see backtraces and crashes on the
2230 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2233 * The other option is to just disable fbdev emulation since very likely the
2234 * first modeset from userspace will crash in the same way, and is even easier
2235 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2236 * kernel cmdline option.
2239 * Zero if everything went ok, nonzero otherwise.
2241 int drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
2243 struct drm_device
*dev
= fb_helper
->dev
;
2244 struct fb_info
*info
;
2247 if (!drm_fbdev_emulation
)
2250 mutex_lock(&dev
->mode_config
.mutex
);
2251 drm_setup_crtcs(fb_helper
,
2252 dev
->mode_config
.max_width
,
2253 dev
->mode_config
.max_height
);
2254 ret
= drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
2255 mutex_unlock(&dev
->mode_config
.mutex
);
2259 info
= fb_helper
->fbdev
;
2260 info
->var
.pixclock
= 0;
2261 ret
= register_framebuffer(info
);
2265 dev_info(dev
->dev
, "fb%d: %s frame buffer device\n",
2266 info
->node
, info
->fix
.id
);
2268 mutex_lock(&kernel_fb_helper_lock
);
2269 if (list_empty(&kernel_fb_helper_list
))
2270 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
2272 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
2273 mutex_unlock(&kernel_fb_helper_lock
);
2277 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
2280 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2281 * probing all the outputs attached to the fb
2282 * @fb_helper: the drm_fb_helper
2284 * Scan the connectors attached to the fb_helper and try to put together a
2285 * setup after notification of a change in output configuration.
2287 * Called at runtime, takes the mode config locks to be able to check/change the
2288 * modeset configuration. Must be run from process context (which usually means
2289 * either the output polling work or a work item launched from the driver's
2290 * hotplug interrupt).
2292 * Note that drivers may call this even before calling
2293 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2294 * for a race-free fbcon setup and will make sure that the fbdev emulation will
2295 * not miss any hotplug events.
2298 * 0 on success and a non-zero error code otherwise.
2300 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
2302 struct drm_device
*dev
= fb_helper
->dev
;
2304 if (!drm_fbdev_emulation
)
2307 mutex_lock(&dev
->mode_config
.mutex
);
2308 if (!fb_helper
->fb
|| !drm_fb_helper_is_bound(fb_helper
)) {
2309 fb_helper
->delayed_hotplug
= true;
2310 mutex_unlock(&dev
->mode_config
.mutex
);
2313 DRM_DEBUG_KMS("\n");
2315 drm_setup_crtcs(fb_helper
, fb_helper
->fb
->width
, fb_helper
->fb
->height
);
2317 mutex_unlock(&dev
->mode_config
.mutex
);
2319 drm_fb_helper_set_par(fb_helper
->fbdev
);
2323 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
2325 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2326 * but the module doesn't depend on any fb console symbols. At least
2327 * attempt to load fbcon to avoid leaving the system without a usable console.
2329 int __init
drm_fb_helper_modinit(void)
2331 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2332 const char *name
= "fbcon";
2333 struct module
*fbcon
;
2335 mutex_lock(&module_mutex
);
2336 fbcon
= find_module(name
);
2337 mutex_unlock(&module_mutex
);
2340 request_module_nowait(name
);
2344 EXPORT_SYMBOL(drm_fb_helper_modinit
);