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 int drm_fbdev_overalloc
= CONFIG_DRM_FBDEV_OVERALLOC
;
52 module_param(drm_fbdev_overalloc
, int, 0444);
53 MODULE_PARM_DESC(drm_fbdev_overalloc
,
54 "Overallocation of the fbdev buffer (%) [default="
55 __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC
) "]");
57 static LIST_HEAD(kernel_fb_helper_list
);
58 static DEFINE_MUTEX(kernel_fb_helper_lock
);
63 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
64 * mode setting driver. They can be used mostly independently from the crtc
65 * helper functions used by many drivers to implement the kernel mode setting
68 * Initialization is done as a four-step process with drm_fb_helper_prepare(),
69 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
70 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
71 * default behaviour can override the third step with their own code.
72 * Teardown is done with drm_fb_helper_fini() after the fbdev device is
73 * unregisters using drm_fb_helper_unregister_fbi().
75 * At runtime drivers should restore the fbdev console by calling
76 * drm_fb_helper_restore_fbdev_mode_unlocked() from their &drm_driver.lastclose
77 * callback. They should also notify the fb helper code from updates to the
78 * output configuration by calling drm_fb_helper_hotplug_event(). For easier
79 * integration with the output polling code in drm_crtc_helper.c the modeset
80 * code provides a &drm_mode_config_funcs.output_poll_changed callback.
82 * All other functions exported by the fb helper library can be used to
83 * implement the fbdev driver interface by the driver.
85 * It is possible, though perhaps somewhat tricky, to implement race-free
86 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
87 * helper must be called first to initialize the minimum required to make
88 * hotplug detection work. Drivers also need to make sure to properly set up
89 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
90 * it is safe to enable interrupts and start processing hotplug events. At the
91 * same time, drivers should initialize all modeset objects such as CRTCs,
92 * encoders and connectors. To finish up the fbdev helper initialization, the
93 * drm_fb_helper_init() function is called. To probe for all attached displays
94 * and set up an initial configuration using the detected hardware, drivers
95 * should call drm_fb_helper_single_add_all_connectors() followed by
96 * drm_fb_helper_initial_config().
98 * If &drm_framebuffer_funcs.dirty is set, the
99 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
100 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right
101 * away. This worker then calls the dirty() function ensuring that it will
102 * always run in process context since the fb_*() function could be running in
103 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
104 * callback it will also schedule dirty_work with the damage collected from the
108 #define drm_fb_helper_for_each_connector(fbh, i__) \
109 for (({ lockdep_assert_held(&(fbh)->lock); }), \
110 i__ = 0; i__ < (fbh)->connector_count; i__++)
112 static int __drm_fb_helper_add_one_connector(struct drm_fb_helper
*fb_helper
,
113 struct drm_connector
*connector
)
115 struct drm_fb_helper_connector
*fb_conn
;
116 struct drm_fb_helper_connector
**temp
;
119 if (!drm_fbdev_emulation
)
122 lockdep_assert_held(&fb_helper
->lock
);
124 count
= fb_helper
->connector_count
+ 1;
126 if (count
> fb_helper
->connector_info_alloc_count
) {
127 size_t size
= count
* sizeof(fb_conn
);
129 temp
= krealloc(fb_helper
->connector_info
, size
, GFP_KERNEL
);
133 fb_helper
->connector_info_alloc_count
= count
;
134 fb_helper
->connector_info
= temp
;
137 fb_conn
= kzalloc(sizeof(*fb_conn
), GFP_KERNEL
);
141 drm_connector_get(connector
);
142 fb_conn
->connector
= connector
;
143 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_conn
;
148 int drm_fb_helper_add_one_connector(struct drm_fb_helper
*fb_helper
,
149 struct drm_connector
*connector
)
153 mutex_lock(&fb_helper
->lock
);
154 err
= __drm_fb_helper_add_one_connector(fb_helper
, connector
);
155 mutex_unlock(&fb_helper
->lock
);
159 EXPORT_SYMBOL(drm_fb_helper_add_one_connector
);
162 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
164 * @fb_helper: fbdev initialized with drm_fb_helper_init
166 * This functions adds all the available connectors for use with the given
167 * fb_helper. This is a separate step to allow drivers to freely assign
168 * connectors to the fbdev, e.g. if some are reserved for special purposes or
169 * not adequate to be used for the fbcon.
171 * This function is protected against concurrent connector hotadds/removals
172 * using drm_fb_helper_add_one_connector() and
173 * drm_fb_helper_remove_one_connector().
175 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper
*fb_helper
)
177 struct drm_device
*dev
= fb_helper
->dev
;
178 struct drm_connector
*connector
;
179 struct drm_connector_list_iter conn_iter
;
182 if (!drm_fbdev_emulation
)
185 mutex_lock(&fb_helper
->lock
);
186 drm_connector_list_iter_begin(dev
, &conn_iter
);
187 drm_for_each_connector_iter(connector
, &conn_iter
) {
188 ret
= __drm_fb_helper_add_one_connector(fb_helper
, connector
);
195 drm_fb_helper_for_each_connector(fb_helper
, i
) {
196 struct drm_fb_helper_connector
*fb_helper_connector
=
197 fb_helper
->connector_info
[i
];
199 drm_connector_put(fb_helper_connector
->connector
);
201 kfree(fb_helper_connector
);
202 fb_helper
->connector_info
[i
] = NULL
;
204 fb_helper
->connector_count
= 0;
206 drm_connector_list_iter_end(&conn_iter
);
207 mutex_unlock(&fb_helper
->lock
);
211 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors
);
213 static int __drm_fb_helper_remove_one_connector(struct drm_fb_helper
*fb_helper
,
214 struct drm_connector
*connector
)
216 struct drm_fb_helper_connector
*fb_helper_connector
;
219 if (!drm_fbdev_emulation
)
222 lockdep_assert_held(&fb_helper
->lock
);
224 drm_fb_helper_for_each_connector(fb_helper
, i
) {
225 if (fb_helper
->connector_info
[i
]->connector
== connector
)
229 if (i
== fb_helper
->connector_count
)
231 fb_helper_connector
= fb_helper
->connector_info
[i
];
232 drm_connector_put(fb_helper_connector
->connector
);
234 for (j
= i
+ 1; j
< fb_helper
->connector_count
; j
++)
235 fb_helper
->connector_info
[j
- 1] = fb_helper
->connector_info
[j
];
237 fb_helper
->connector_count
--;
238 kfree(fb_helper_connector
);
243 int drm_fb_helper_remove_one_connector(struct drm_fb_helper
*fb_helper
,
244 struct drm_connector
*connector
)
248 mutex_lock(&fb_helper
->lock
);
249 err
= __drm_fb_helper_remove_one_connector(fb_helper
, connector
);
250 mutex_unlock(&fb_helper
->lock
);
254 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector
);
256 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc
*crtc
)
258 uint16_t *r_base
, *g_base
, *b_base
;
260 if (crtc
->funcs
->gamma_set
== NULL
)
263 r_base
= crtc
->gamma_store
;
264 g_base
= r_base
+ crtc
->gamma_size
;
265 b_base
= g_base
+ crtc
->gamma_size
;
267 crtc
->funcs
->gamma_set(crtc
, r_base
, g_base
, b_base
,
268 crtc
->gamma_size
, NULL
);
272 * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
273 * @info: fbdev registered by the helper
275 int drm_fb_helper_debug_enter(struct fb_info
*info
)
277 struct drm_fb_helper
*helper
= info
->par
;
278 const struct drm_crtc_helper_funcs
*funcs
;
281 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
282 for (i
= 0; i
< helper
->crtc_count
; i
++) {
283 struct drm_mode_set
*mode_set
=
284 &helper
->crtc_info
[i
].mode_set
;
286 if (!mode_set
->crtc
->enabled
)
289 funcs
= mode_set
->crtc
->helper_private
;
290 if (funcs
->mode_set_base_atomic
== NULL
)
293 if (drm_drv_uses_atomic_modeset(mode_set
->crtc
->dev
))
296 funcs
->mode_set_base_atomic(mode_set
->crtc
,
300 ENTER_ATOMIC_MODE_SET
);
306 EXPORT_SYMBOL(drm_fb_helper_debug_enter
);
309 * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
310 * @info: fbdev registered by the helper
312 int drm_fb_helper_debug_leave(struct fb_info
*info
)
314 struct drm_fb_helper
*helper
= info
->par
;
315 struct drm_crtc
*crtc
;
316 const struct drm_crtc_helper_funcs
*funcs
;
317 struct drm_framebuffer
*fb
;
320 for (i
= 0; i
< helper
->crtc_count
; i
++) {
321 struct drm_mode_set
*mode_set
= &helper
->crtc_info
[i
].mode_set
;
323 crtc
= mode_set
->crtc
;
324 if (drm_drv_uses_atomic_modeset(crtc
->dev
))
327 funcs
= crtc
->helper_private
;
328 fb
= crtc
->primary
->fb
;
334 DRM_ERROR("no fb to restore??\n");
338 if (funcs
->mode_set_base_atomic
== NULL
)
341 drm_fb_helper_restore_lut_atomic(mode_set
->crtc
);
342 funcs
->mode_set_base_atomic(mode_set
->crtc
, fb
, crtc
->x
,
343 crtc
->y
, LEAVE_ATOMIC_MODE_SET
);
348 EXPORT_SYMBOL(drm_fb_helper_debug_leave
);
350 static int restore_fbdev_mode_atomic(struct drm_fb_helper
*fb_helper
, bool active
)
352 struct drm_device
*dev
= fb_helper
->dev
;
353 struct drm_plane
*plane
;
354 struct drm_atomic_state
*state
;
356 unsigned int plane_mask
;
357 struct drm_modeset_acquire_ctx ctx
;
359 drm_modeset_acquire_init(&ctx
, 0);
361 state
= drm_atomic_state_alloc(dev
);
367 state
->acquire_ctx
= &ctx
;
370 drm_for_each_plane(plane
, dev
) {
371 struct drm_plane_state
*plane_state
;
373 plane_state
= drm_atomic_get_plane_state(state
, plane
);
374 if (IS_ERR(plane_state
)) {
375 ret
= PTR_ERR(plane_state
);
379 plane_state
->rotation
= DRM_MODE_ROTATE_0
;
381 plane
->old_fb
= plane
->fb
;
382 plane_mask
|= 1 << drm_plane_index(plane
);
384 /* disable non-primary: */
385 if (plane
->type
== DRM_PLANE_TYPE_PRIMARY
)
388 ret
= __drm_atomic_helper_disable_plane(plane
, plane_state
);
393 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
394 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
396 ret
= __drm_atomic_helper_set_config(mode_set
, state
);
401 * __drm_atomic_helper_set_config() sets active when a
402 * mode is set, unconditionally clear it if we force DPMS off
405 struct drm_crtc
*crtc
= mode_set
->crtc
;
406 struct drm_crtc_state
*crtc_state
= drm_atomic_get_new_crtc_state(state
, crtc
);
408 crtc_state
->active
= false;
412 ret
= drm_atomic_commit(state
);
415 drm_atomic_clean_old_fb(dev
, plane_mask
, ret
);
420 drm_atomic_state_put(state
);
422 drm_modeset_drop_locks(&ctx
);
423 drm_modeset_acquire_fini(&ctx
);
428 drm_atomic_state_clear(state
);
429 drm_modeset_backoff(&ctx
);
434 static int restore_fbdev_mode_legacy(struct drm_fb_helper
*fb_helper
)
436 struct drm_device
*dev
= fb_helper
->dev
;
437 struct drm_plane
*plane
;
440 drm_modeset_lock_all(fb_helper
->dev
);
441 drm_for_each_plane(plane
, dev
) {
442 if (plane
->type
!= DRM_PLANE_TYPE_PRIMARY
)
443 drm_plane_force_disable(plane
);
445 if (plane
->rotation_property
)
446 drm_mode_plane_set_obj_prop(plane
,
447 plane
->rotation_property
,
451 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
452 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
453 struct drm_crtc
*crtc
= mode_set
->crtc
;
455 if (crtc
->funcs
->cursor_set2
) {
456 ret
= crtc
->funcs
->cursor_set2(crtc
, NULL
, 0, 0, 0, 0, 0);
459 } else if (crtc
->funcs
->cursor_set
) {
460 ret
= crtc
->funcs
->cursor_set(crtc
, NULL
, 0, 0, 0);
465 ret
= drm_mode_set_config_internal(mode_set
);
470 drm_modeset_unlock_all(fb_helper
->dev
);
475 static int restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
477 struct drm_device
*dev
= fb_helper
->dev
;
479 if (drm_drv_uses_atomic_modeset(dev
))
480 return restore_fbdev_mode_atomic(fb_helper
, true);
482 return restore_fbdev_mode_legacy(fb_helper
);
486 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
487 * @fb_helper: fbcon to restore
489 * This should be called from driver's drm &drm_driver.lastclose callback
490 * when implementing an fbcon on top of kms using this helper. This ensures that
491 * the user isn't greeted with a black screen when e.g. X dies.
494 * Zero if everything went ok, negative error code otherwise.
496 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper
*fb_helper
)
501 if (!drm_fbdev_emulation
)
504 if (READ_ONCE(fb_helper
->deferred_setup
))
507 mutex_lock(&fb_helper
->lock
);
508 ret
= restore_fbdev_mode(fb_helper
);
510 do_delayed
= fb_helper
->delayed_hotplug
;
512 fb_helper
->delayed_hotplug
= false;
513 mutex_unlock(&fb_helper
->lock
);
516 drm_fb_helper_hotplug_event(fb_helper
);
520 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked
);
522 static bool drm_fb_helper_is_bound(struct drm_fb_helper
*fb_helper
)
524 struct drm_device
*dev
= fb_helper
->dev
;
525 struct drm_crtc
*crtc
;
526 int bound
= 0, crtcs_bound
= 0;
529 * Sometimes user space wants everything disabled, so don't steal the
530 * display if there's a master.
532 if (READ_ONCE(dev
->master
))
535 drm_for_each_crtc(crtc
, dev
) {
536 drm_modeset_lock(&crtc
->mutex
, NULL
);
537 if (crtc
->primary
->fb
)
539 if (crtc
->primary
->fb
== fb_helper
->fb
)
541 drm_modeset_unlock(&crtc
->mutex
);
544 if (bound
< crtcs_bound
)
550 #ifdef CONFIG_MAGIC_SYSRQ
552 * restore fbcon display for all kms driver's using this helper, used for sysrq
553 * and panic handling.
555 static bool drm_fb_helper_force_kernel_mode(void)
557 bool ret
, error
= false;
558 struct drm_fb_helper
*helper
;
560 if (list_empty(&kernel_fb_helper_list
))
563 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
564 struct drm_device
*dev
= helper
->dev
;
566 if (dev
->switch_power_state
== DRM_SWITCH_POWER_OFF
)
569 mutex_lock(&helper
->lock
);
570 ret
= restore_fbdev_mode(helper
);
573 mutex_unlock(&helper
->lock
);
578 static void drm_fb_helper_restore_work_fn(struct work_struct
*ignored
)
582 ret
= drm_fb_helper_force_kernel_mode();
584 DRM_ERROR("Failed to restore crtc configuration\n");
586 static DECLARE_WORK(drm_fb_helper_restore_work
, drm_fb_helper_restore_work_fn
);
588 static void drm_fb_helper_sysrq(int dummy1
)
590 schedule_work(&drm_fb_helper_restore_work
);
593 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
594 .handler
= drm_fb_helper_sysrq
,
595 .help_msg
= "force-fb(V)",
596 .action_msg
= "Restore framebuffer console",
599 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= { };
602 static void dpms_legacy(struct drm_fb_helper
*fb_helper
, int dpms_mode
)
604 struct drm_device
*dev
= fb_helper
->dev
;
605 struct drm_crtc
*crtc
;
606 struct drm_connector
*connector
;
609 drm_modeset_lock_all(dev
);
610 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
611 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
616 /* Walk the connectors & encoders on this fb turning them on/off */
617 drm_fb_helper_for_each_connector(fb_helper
, j
) {
618 connector
= fb_helper
->connector_info
[j
]->connector
;
619 connector
->funcs
->dpms(connector
, dpms_mode
);
620 drm_object_property_set_value(&connector
->base
,
621 dev
->mode_config
.dpms_property
, dpms_mode
);
624 drm_modeset_unlock_all(dev
);
627 static void drm_fb_helper_dpms(struct fb_info
*info
, int dpms_mode
)
629 struct drm_fb_helper
*fb_helper
= info
->par
;
632 * For each CRTC in this fb, turn the connectors on/off.
634 mutex_lock(&fb_helper
->lock
);
635 if (!drm_fb_helper_is_bound(fb_helper
)) {
636 mutex_unlock(&fb_helper
->lock
);
640 if (drm_drv_uses_atomic_modeset(fb_helper
->dev
))
641 restore_fbdev_mode_atomic(fb_helper
, dpms_mode
== DRM_MODE_DPMS_ON
);
643 dpms_legacy(fb_helper
, dpms_mode
);
644 mutex_unlock(&fb_helper
->lock
);
648 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank
649 * @blank: desired blanking state
650 * @info: fbdev registered by the helper
652 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
654 if (oops_in_progress
)
658 /* Display: On; HSync: On, VSync: On */
659 case FB_BLANK_UNBLANK
:
660 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
662 /* Display: Off; HSync: On, VSync: On */
663 case FB_BLANK_NORMAL
:
664 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
666 /* Display: Off; HSync: Off, VSync: On */
667 case FB_BLANK_HSYNC_SUSPEND
:
668 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
670 /* Display: Off; HSync: On, VSync: Off */
671 case FB_BLANK_VSYNC_SUSPEND
:
672 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
674 /* Display: Off; HSync: Off, VSync: Off */
675 case FB_BLANK_POWERDOWN
:
676 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
681 EXPORT_SYMBOL(drm_fb_helper_blank
);
683 static void drm_fb_helper_modeset_release(struct drm_fb_helper
*helper
,
684 struct drm_mode_set
*modeset
)
688 for (i
= 0; i
< modeset
->num_connectors
; i
++) {
689 drm_connector_put(modeset
->connectors
[i
]);
690 modeset
->connectors
[i
] = NULL
;
692 modeset
->num_connectors
= 0;
694 drm_mode_destroy(helper
->dev
, modeset
->mode
);
695 modeset
->mode
= NULL
;
697 /* FIXME should hold a ref? */
701 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
705 for (i
= 0; i
< helper
->connector_count
; i
++) {
706 drm_connector_put(helper
->connector_info
[i
]->connector
);
707 kfree(helper
->connector_info
[i
]);
709 kfree(helper
->connector_info
);
711 for (i
= 0; i
< helper
->crtc_count
; i
++) {
712 struct drm_mode_set
*modeset
= &helper
->crtc_info
[i
].mode_set
;
714 drm_fb_helper_modeset_release(helper
, modeset
);
715 kfree(modeset
->connectors
);
717 kfree(helper
->crtc_info
);
720 static void drm_fb_helper_resume_worker(struct work_struct
*work
)
722 struct drm_fb_helper
*helper
= container_of(work
, struct drm_fb_helper
,
726 fb_set_suspend(helper
->fbdev
, 0);
730 static void drm_fb_helper_dirty_work(struct work_struct
*work
)
732 struct drm_fb_helper
*helper
= container_of(work
, struct drm_fb_helper
,
734 struct drm_clip_rect
*clip
= &helper
->dirty_clip
;
735 struct drm_clip_rect clip_copy
;
738 spin_lock_irqsave(&helper
->dirty_lock
, flags
);
740 clip
->x1
= clip
->y1
= ~0;
741 clip
->x2
= clip
->y2
= 0;
742 spin_unlock_irqrestore(&helper
->dirty_lock
, flags
);
744 /* call dirty callback only when it has been really touched */
745 if (clip_copy
.x1
< clip_copy
.x2
&& clip_copy
.y1
< clip_copy
.y2
)
746 helper
->fb
->funcs
->dirty(helper
->fb
, NULL
, 0, 0, &clip_copy
, 1);
750 * drm_fb_helper_prepare - setup a drm_fb_helper structure
752 * @helper: driver-allocated fbdev helper structure to set up
753 * @funcs: pointer to structure of functions associate with this helper
755 * Sets up the bare minimum to make the framebuffer helper usable. This is
756 * useful to implement race-free initialization of the polling helpers.
758 void drm_fb_helper_prepare(struct drm_device
*dev
, struct drm_fb_helper
*helper
,
759 const struct drm_fb_helper_funcs
*funcs
)
761 INIT_LIST_HEAD(&helper
->kernel_fb_list
);
762 spin_lock_init(&helper
->dirty_lock
);
763 INIT_WORK(&helper
->resume_work
, drm_fb_helper_resume_worker
);
764 INIT_WORK(&helper
->dirty_work
, drm_fb_helper_dirty_work
);
765 helper
->dirty_clip
.x1
= helper
->dirty_clip
.y1
= ~0;
766 mutex_init(&helper
->lock
);
767 helper
->funcs
= funcs
;
770 EXPORT_SYMBOL(drm_fb_helper_prepare
);
773 * drm_fb_helper_init - initialize a &struct drm_fb_helper
775 * @fb_helper: driver-allocated fbdev helper structure to initialize
776 * @max_conn_count: max connector count
778 * This allocates the structures for the fbdev helper with the given limits.
779 * Note that this won't yet touch the hardware (through the driver interfaces)
780 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
781 * to allow driver writes more control over the exact init sequence.
783 * Drivers must call drm_fb_helper_prepare() before calling this function.
786 * Zero if everything went ok, nonzero otherwise.
788 int drm_fb_helper_init(struct drm_device
*dev
,
789 struct drm_fb_helper
*fb_helper
,
792 struct drm_crtc
*crtc
;
793 struct drm_mode_config
*config
= &dev
->mode_config
;
796 if (!drm_fbdev_emulation
)
802 fb_helper
->crtc_info
= kcalloc(config
->num_crtc
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
803 if (!fb_helper
->crtc_info
)
806 fb_helper
->crtc_count
= config
->num_crtc
;
807 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
808 if (!fb_helper
->connector_info
) {
809 kfree(fb_helper
->crtc_info
);
812 fb_helper
->connector_info_alloc_count
= dev
->mode_config
.num_connector
;
813 fb_helper
->connector_count
= 0;
815 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
816 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
817 kcalloc(max_conn_count
,
818 sizeof(struct drm_connector
*),
821 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
823 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
827 drm_for_each_crtc(crtc
, dev
) {
828 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
834 drm_fb_helper_crtc_free(fb_helper
);
837 EXPORT_SYMBOL(drm_fb_helper_init
);
840 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
841 * @fb_helper: driver-allocated fbdev helper
843 * A helper to alloc fb_info and the members cmap and apertures. Called
844 * by the driver within the fb_probe fb_helper callback function. Drivers do not
845 * need to release the allocated fb_info structure themselves, this is
846 * automatically done when calling drm_fb_helper_fini().
849 * fb_info pointer if things went okay, pointer containing error code
852 struct fb_info
*drm_fb_helper_alloc_fbi(struct drm_fb_helper
*fb_helper
)
854 struct device
*dev
= fb_helper
->dev
->dev
;
855 struct fb_info
*info
;
858 info
= framebuffer_alloc(0, dev
);
860 return ERR_PTR(-ENOMEM
);
862 ret
= fb_alloc_cmap(&info
->cmap
, 256, 0);
866 info
->apertures
= alloc_apertures(1);
867 if (!info
->apertures
) {
872 fb_helper
->fbdev
= info
;
877 fb_dealloc_cmap(&info
->cmap
);
879 framebuffer_release(info
);
882 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi
);
885 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
886 * @fb_helper: driver-allocated fbdev helper
888 * A wrapper around unregister_framebuffer, to release the fb_info
889 * framebuffer device. This must be called before releasing all resources for
890 * @fb_helper by calling drm_fb_helper_fini().
892 void drm_fb_helper_unregister_fbi(struct drm_fb_helper
*fb_helper
)
894 if (fb_helper
&& fb_helper
->fbdev
)
895 unregister_framebuffer(fb_helper
->fbdev
);
897 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi
);
900 * drm_fb_helper_fini - finialize a &struct drm_fb_helper
901 * @fb_helper: driver-allocated fbdev helper
903 * This cleans up all remaining resources associated with @fb_helper. Must be
904 * called after drm_fb_helper_unlink_fbi() was called.
906 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
908 struct fb_info
*info
;
910 if (!drm_fbdev_emulation
|| !fb_helper
)
913 cancel_work_sync(&fb_helper
->resume_work
);
914 cancel_work_sync(&fb_helper
->dirty_work
);
916 info
= fb_helper
->fbdev
;
919 fb_dealloc_cmap(&info
->cmap
);
920 framebuffer_release(info
);
922 fb_helper
->fbdev
= NULL
;
924 mutex_lock(&kernel_fb_helper_lock
);
925 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
926 list_del(&fb_helper
->kernel_fb_list
);
927 if (list_empty(&kernel_fb_helper_list
))
928 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
930 mutex_unlock(&kernel_fb_helper_lock
);
932 mutex_destroy(&fb_helper
->lock
);
933 drm_fb_helper_crtc_free(fb_helper
);
936 EXPORT_SYMBOL(drm_fb_helper_fini
);
939 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
940 * @fb_helper: driver-allocated fbdev helper
942 * A wrapper around unlink_framebuffer implemented by fbdev core
944 void drm_fb_helper_unlink_fbi(struct drm_fb_helper
*fb_helper
)
946 if (fb_helper
&& fb_helper
->fbdev
)
947 unlink_framebuffer(fb_helper
->fbdev
);
949 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi
);
951 static void drm_fb_helper_dirty(struct fb_info
*info
, u32 x
, u32 y
,
952 u32 width
, u32 height
)
954 struct drm_fb_helper
*helper
= info
->par
;
955 struct drm_clip_rect
*clip
= &helper
->dirty_clip
;
958 if (!helper
->fb
->funcs
->dirty
)
961 spin_lock_irqsave(&helper
->dirty_lock
, flags
);
962 clip
->x1
= min_t(u32
, clip
->x1
, x
);
963 clip
->y1
= min_t(u32
, clip
->y1
, y
);
964 clip
->x2
= max_t(u32
, clip
->x2
, x
+ width
);
965 clip
->y2
= max_t(u32
, clip
->y2
, y
+ height
);
966 spin_unlock_irqrestore(&helper
->dirty_lock
, flags
);
968 schedule_work(&helper
->dirty_work
);
972 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
973 * @info: fb_info struct pointer
974 * @pagelist: list of dirty mmap framebuffer pages
976 * This function is used as the &fb_deferred_io.deferred_io
977 * callback function for flushing the fbdev mmap writes.
979 void drm_fb_helper_deferred_io(struct fb_info
*info
,
980 struct list_head
*pagelist
)
982 unsigned long start
, end
, min
, max
;
988 list_for_each_entry(page
, pagelist
, lru
) {
989 start
= page
->index
<< PAGE_SHIFT
;
990 end
= start
+ PAGE_SIZE
- 1;
991 min
= min(min
, start
);
996 y1
= min
/ info
->fix
.line_length
;
997 y2
= min_t(u32
, DIV_ROUND_UP(max
, info
->fix
.line_length
),
999 drm_fb_helper_dirty(info
, 0, y1
, info
->var
.xres
, y2
- y1
);
1002 EXPORT_SYMBOL(drm_fb_helper_deferred_io
);
1005 * drm_fb_helper_sys_read - wrapper around fb_sys_read
1006 * @info: fb_info struct pointer
1007 * @buf: userspace buffer to read from framebuffer memory
1008 * @count: number of bytes to read from framebuffer memory
1009 * @ppos: read offset within framebuffer memory
1011 * A wrapper around fb_sys_read implemented by fbdev core
1013 ssize_t
drm_fb_helper_sys_read(struct fb_info
*info
, char __user
*buf
,
1014 size_t count
, loff_t
*ppos
)
1016 return fb_sys_read(info
, buf
, count
, ppos
);
1018 EXPORT_SYMBOL(drm_fb_helper_sys_read
);
1021 * drm_fb_helper_sys_write - wrapper around fb_sys_write
1022 * @info: fb_info struct pointer
1023 * @buf: userspace buffer to write to framebuffer memory
1024 * @count: number of bytes to write to framebuffer memory
1025 * @ppos: write offset within framebuffer memory
1027 * A wrapper around fb_sys_write implemented by fbdev core
1029 ssize_t
drm_fb_helper_sys_write(struct fb_info
*info
, const char __user
*buf
,
1030 size_t count
, loff_t
*ppos
)
1034 ret
= fb_sys_write(info
, buf
, count
, ppos
);
1036 drm_fb_helper_dirty(info
, 0, 0, info
->var
.xres
,
1041 EXPORT_SYMBOL(drm_fb_helper_sys_write
);
1044 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
1045 * @info: fbdev registered by the helper
1046 * @rect: info about rectangle to fill
1048 * A wrapper around sys_fillrect implemented by fbdev core
1050 void drm_fb_helper_sys_fillrect(struct fb_info
*info
,
1051 const struct fb_fillrect
*rect
)
1053 sys_fillrect(info
, rect
);
1054 drm_fb_helper_dirty(info
, rect
->dx
, rect
->dy
,
1055 rect
->width
, rect
->height
);
1057 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect
);
1060 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
1061 * @info: fbdev registered by the helper
1062 * @area: info about area to copy
1064 * A wrapper around sys_copyarea implemented by fbdev core
1066 void drm_fb_helper_sys_copyarea(struct fb_info
*info
,
1067 const struct fb_copyarea
*area
)
1069 sys_copyarea(info
, area
);
1070 drm_fb_helper_dirty(info
, area
->dx
, area
->dy
,
1071 area
->width
, area
->height
);
1073 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea
);
1076 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
1077 * @info: fbdev registered by the helper
1078 * @image: info about image to blit
1080 * A wrapper around sys_imageblit implemented by fbdev core
1082 void drm_fb_helper_sys_imageblit(struct fb_info
*info
,
1083 const struct fb_image
*image
)
1085 sys_imageblit(info
, image
);
1086 drm_fb_helper_dirty(info
, image
->dx
, image
->dy
,
1087 image
->width
, image
->height
);
1089 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit
);
1092 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
1093 * @info: fbdev registered by the helper
1094 * @rect: info about rectangle to fill
1096 * A wrapper around cfb_imageblit implemented by fbdev core
1098 void drm_fb_helper_cfb_fillrect(struct fb_info
*info
,
1099 const struct fb_fillrect
*rect
)
1101 cfb_fillrect(info
, rect
);
1102 drm_fb_helper_dirty(info
, rect
->dx
, rect
->dy
,
1103 rect
->width
, rect
->height
);
1105 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect
);
1108 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
1109 * @info: fbdev registered by the helper
1110 * @area: info about area to copy
1112 * A wrapper around cfb_copyarea implemented by fbdev core
1114 void drm_fb_helper_cfb_copyarea(struct fb_info
*info
,
1115 const struct fb_copyarea
*area
)
1117 cfb_copyarea(info
, area
);
1118 drm_fb_helper_dirty(info
, area
->dx
, area
->dy
,
1119 area
->width
, area
->height
);
1121 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea
);
1124 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1125 * @info: fbdev registered by the helper
1126 * @image: info about image to blit
1128 * A wrapper around cfb_imageblit implemented by fbdev core
1130 void drm_fb_helper_cfb_imageblit(struct fb_info
*info
,
1131 const struct fb_image
*image
)
1133 cfb_imageblit(info
, image
);
1134 drm_fb_helper_dirty(info
, image
->dx
, image
->dy
,
1135 image
->width
, image
->height
);
1137 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit
);
1140 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1141 * @fb_helper: driver-allocated fbdev helper
1142 * @suspend: whether to suspend or resume
1144 * A wrapper around fb_set_suspend implemented by fbdev core.
1145 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
1148 void drm_fb_helper_set_suspend(struct drm_fb_helper
*fb_helper
, bool suspend
)
1150 if (fb_helper
&& fb_helper
->fbdev
)
1151 fb_set_suspend(fb_helper
->fbdev
, suspend
);
1153 EXPORT_SYMBOL(drm_fb_helper_set_suspend
);
1156 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
1157 * takes the console lock
1158 * @fb_helper: driver-allocated fbdev helper
1159 * @suspend: whether to suspend or resume
1161 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
1162 * isn't available on resume, a worker is tasked with waiting for the lock
1163 * to become available. The console lock can be pretty contented on resume
1164 * due to all the printk activity.
1166 * This function can be called multiple times with the same state since
1167 * &fb_info.state is checked to see if fbdev is running or not before locking.
1169 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
1171 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper
*fb_helper
,
1174 if (!fb_helper
|| !fb_helper
->fbdev
)
1177 /* make sure there's no pending/ongoing resume */
1178 flush_work(&fb_helper
->resume_work
);
1181 if (fb_helper
->fbdev
->state
!= FBINFO_STATE_RUNNING
)
1187 if (fb_helper
->fbdev
->state
== FBINFO_STATE_RUNNING
)
1190 if (!console_trylock()) {
1191 schedule_work(&fb_helper
->resume_work
);
1196 fb_set_suspend(fb_helper
->fbdev
, suspend
);
1199 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked
);
1201 static int setcmap_pseudo_palette(struct fb_cmap
*cmap
, struct fb_info
*info
)
1203 u32
*palette
= (u32
*)info
->pseudo_palette
;
1206 if (cmap
->start
+ cmap
->len
> 16)
1209 for (i
= 0; i
< cmap
->len
; ++i
) {
1210 u16 red
= cmap
->red
[i
];
1211 u16 green
= cmap
->green
[i
];
1212 u16 blue
= cmap
->blue
[i
];
1215 red
>>= 16 - info
->var
.red
.length
;
1216 green
>>= 16 - info
->var
.green
.length
;
1217 blue
>>= 16 - info
->var
.blue
.length
;
1218 value
= (red
<< info
->var
.red
.offset
) |
1219 (green
<< info
->var
.green
.offset
) |
1220 (blue
<< info
->var
.blue
.offset
);
1221 if (info
->var
.transp
.length
> 0) {
1222 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
1224 mask
<<= info
->var
.transp
.offset
;
1227 palette
[cmap
->start
+ i
] = value
;
1233 static int setcmap_legacy(struct fb_cmap
*cmap
, struct fb_info
*info
)
1235 struct drm_fb_helper
*fb_helper
= info
->par
;
1236 struct drm_crtc
*crtc
;
1240 drm_modeset_lock_all(fb_helper
->dev
);
1241 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1242 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
1243 if (!crtc
->funcs
->gamma_set
|| !crtc
->gamma_size
)
1246 if (cmap
->start
+ cmap
->len
> crtc
->gamma_size
)
1249 r
= crtc
->gamma_store
;
1250 g
= r
+ crtc
->gamma_size
;
1251 b
= g
+ crtc
->gamma_size
;
1253 memcpy(r
+ cmap
->start
, cmap
->red
, cmap
->len
* sizeof(*r
));
1254 memcpy(g
+ cmap
->start
, cmap
->green
, cmap
->len
* sizeof(*g
));
1255 memcpy(b
+ cmap
->start
, cmap
->blue
, cmap
->len
* sizeof(*b
));
1257 ret
= crtc
->funcs
->gamma_set(crtc
, r
, g
, b
,
1258 crtc
->gamma_size
, NULL
);
1262 drm_modeset_unlock_all(fb_helper
->dev
);
1267 static struct drm_property_blob
*setcmap_new_gamma_lut(struct drm_crtc
*crtc
,
1268 struct fb_cmap
*cmap
)
1270 struct drm_device
*dev
= crtc
->dev
;
1271 struct drm_property_blob
*gamma_lut
;
1272 struct drm_color_lut
*lut
;
1273 int size
= crtc
->gamma_size
;
1276 if (!size
|| cmap
->start
+ cmap
->len
> size
)
1277 return ERR_PTR(-EINVAL
);
1279 gamma_lut
= drm_property_create_blob(dev
, sizeof(*lut
) * size
, NULL
);
1280 if (IS_ERR(gamma_lut
))
1283 lut
= (struct drm_color_lut
*)gamma_lut
->data
;
1284 if (cmap
->start
|| cmap
->len
!= size
) {
1285 u16
*r
= crtc
->gamma_store
;
1286 u16
*g
= r
+ crtc
->gamma_size
;
1287 u16
*b
= g
+ crtc
->gamma_size
;
1289 for (i
= 0; i
< cmap
->start
; i
++) {
1291 lut
[i
].green
= g
[i
];
1294 for (i
= cmap
->start
+ cmap
->len
; i
< size
; i
++) {
1296 lut
[i
].green
= g
[i
];
1301 for (i
= 0; i
< cmap
->len
; i
++) {
1302 lut
[cmap
->start
+ i
].red
= cmap
->red
[i
];
1303 lut
[cmap
->start
+ i
].green
= cmap
->green
[i
];
1304 lut
[cmap
->start
+ i
].blue
= cmap
->blue
[i
];
1310 static int setcmap_atomic(struct fb_cmap
*cmap
, struct fb_info
*info
)
1312 struct drm_fb_helper
*fb_helper
= info
->par
;
1313 struct drm_device
*dev
= fb_helper
->dev
;
1314 struct drm_property_blob
*gamma_lut
= NULL
;
1315 struct drm_modeset_acquire_ctx ctx
;
1316 struct drm_crtc_state
*crtc_state
;
1317 struct drm_atomic_state
*state
;
1318 struct drm_crtc
*crtc
;
1323 drm_modeset_acquire_init(&ctx
, 0);
1325 state
= drm_atomic_state_alloc(dev
);
1331 state
->acquire_ctx
= &ctx
;
1333 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1334 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
1337 gamma_lut
= setcmap_new_gamma_lut(crtc
, cmap
);
1338 if (IS_ERR(gamma_lut
)) {
1339 ret
= PTR_ERR(gamma_lut
);
1344 crtc_state
= drm_atomic_get_crtc_state(state
, crtc
);
1345 if (IS_ERR(crtc_state
)) {
1346 ret
= PTR_ERR(crtc_state
);
1350 replaced
= drm_property_replace_blob(&crtc_state
->degamma_lut
,
1352 replaced
|= drm_property_replace_blob(&crtc_state
->ctm
, NULL
);
1353 replaced
|= drm_property_replace_blob(&crtc_state
->gamma_lut
,
1355 crtc_state
->color_mgmt_changed
|= replaced
;
1358 ret
= drm_atomic_commit(state
);
1362 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1363 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
1365 r
= crtc
->gamma_store
;
1366 g
= r
+ crtc
->gamma_size
;
1367 b
= g
+ crtc
->gamma_size
;
1369 memcpy(r
+ cmap
->start
, cmap
->red
, cmap
->len
* sizeof(*r
));
1370 memcpy(g
+ cmap
->start
, cmap
->green
, cmap
->len
* sizeof(*g
));
1371 memcpy(b
+ cmap
->start
, cmap
->blue
, cmap
->len
* sizeof(*b
));
1375 if (ret
== -EDEADLK
)
1378 drm_property_blob_put(gamma_lut
);
1379 drm_atomic_state_put(state
);
1381 drm_modeset_drop_locks(&ctx
);
1382 drm_modeset_acquire_fini(&ctx
);
1387 drm_atomic_state_clear(state
);
1388 drm_modeset_backoff(&ctx
);
1393 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
1394 * @cmap: cmap to set
1395 * @info: fbdev registered by the helper
1397 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
1399 struct drm_fb_helper
*fb_helper
= info
->par
;
1402 if (oops_in_progress
)
1405 mutex_lock(&fb_helper
->lock
);
1407 if (!drm_fb_helper_is_bound(fb_helper
)) {
1412 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
)
1413 ret
= setcmap_pseudo_palette(cmap
, info
);
1414 else if (drm_drv_uses_atomic_modeset(fb_helper
->dev
))
1415 ret
= setcmap_atomic(cmap
, info
);
1417 ret
= setcmap_legacy(cmap
, info
);
1420 mutex_unlock(&fb_helper
->lock
);
1424 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
1427 * drm_fb_helper_ioctl - legacy ioctl implementation
1428 * @info: fbdev registered by the helper
1429 * @cmd: ioctl command
1430 * @arg: ioctl argument
1432 * A helper to implement the standard fbdev ioctl. Only
1433 * FBIO_WAITFORVSYNC is implemented for now.
1435 int drm_fb_helper_ioctl(struct fb_info
*info
, unsigned int cmd
,
1438 struct drm_fb_helper
*fb_helper
= info
->par
;
1439 struct drm_mode_set
*mode_set
;
1440 struct drm_crtc
*crtc
;
1443 mutex_lock(&fb_helper
->lock
);
1444 if (!drm_fb_helper_is_bound(fb_helper
)) {
1450 case FBIO_WAITFORVSYNC
:
1452 * Only consider the first CRTC.
1454 * This ioctl is supposed to take the CRTC number as
1455 * an argument, but in fbdev times, what that number
1456 * was supposed to be was quite unclear, different
1457 * drivers were passing that argument differently
1458 * (some by reference, some by value), and most of the
1459 * userspace applications were just hardcoding 0 as an
1462 * The first CRTC should be the integrated panel on
1463 * most drivers, so this is the best choice we can
1464 * make. If we're not smart enough here, one should
1465 * just consider switch the userspace to KMS.
1467 mode_set
= &fb_helper
->crtc_info
[0].mode_set
;
1468 crtc
= mode_set
->crtc
;
1471 * Only wait for a vblank event if the CRTC is
1472 * enabled, otherwise just don't do anythintg,
1473 * not even report an error.
1475 ret
= drm_crtc_vblank_get(crtc
);
1477 drm_crtc_wait_one_vblank(crtc
);
1478 drm_crtc_vblank_put(crtc
);
1488 mutex_unlock(&fb_helper
->lock
);
1491 EXPORT_SYMBOL(drm_fb_helper_ioctl
);
1494 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
1495 * @var: screeninfo to check
1496 * @info: fbdev registered by the helper
1498 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
1499 struct fb_info
*info
)
1501 struct drm_fb_helper
*fb_helper
= info
->par
;
1502 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1505 if (var
->pixclock
!= 0 || in_dbg_master())
1509 * Changes struct fb_var_screeninfo are currently not pushed back
1510 * to KMS, hence fail if different settings are requested.
1512 if (var
->bits_per_pixel
!= fb
->format
->cpp
[0] * 8 ||
1513 var
->xres
> fb
->width
|| var
->yres
> fb
->height
||
1514 var
->xres_virtual
> fb
->width
|| var
->yres_virtual
> fb
->height
) {
1515 DRM_DEBUG("fb requested width/height/bpp can't fit in current fb "
1516 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1517 var
->xres
, var
->yres
, var
->bits_per_pixel
,
1518 var
->xres_virtual
, var
->yres_virtual
,
1519 fb
->width
, fb
->height
, fb
->format
->cpp
[0] * 8);
1523 switch (var
->bits_per_pixel
) {
1525 depth
= (var
->green
.length
== 6) ? 16 : 15;
1528 depth
= (var
->transp
.length
> 0) ? 32 : 24;
1531 depth
= var
->bits_per_pixel
;
1537 var
->red
.offset
= 0;
1538 var
->green
.offset
= 0;
1539 var
->blue
.offset
= 0;
1540 var
->red
.length
= 8;
1541 var
->green
.length
= 8;
1542 var
->blue
.length
= 8;
1543 var
->transp
.length
= 0;
1544 var
->transp
.offset
= 0;
1547 var
->red
.offset
= 10;
1548 var
->green
.offset
= 5;
1549 var
->blue
.offset
= 0;
1550 var
->red
.length
= 5;
1551 var
->green
.length
= 5;
1552 var
->blue
.length
= 5;
1553 var
->transp
.length
= 1;
1554 var
->transp
.offset
= 15;
1557 var
->red
.offset
= 11;
1558 var
->green
.offset
= 5;
1559 var
->blue
.offset
= 0;
1560 var
->red
.length
= 5;
1561 var
->green
.length
= 6;
1562 var
->blue
.length
= 5;
1563 var
->transp
.length
= 0;
1564 var
->transp
.offset
= 0;
1567 var
->red
.offset
= 16;
1568 var
->green
.offset
= 8;
1569 var
->blue
.offset
= 0;
1570 var
->red
.length
= 8;
1571 var
->green
.length
= 8;
1572 var
->blue
.length
= 8;
1573 var
->transp
.length
= 0;
1574 var
->transp
.offset
= 0;
1577 var
->red
.offset
= 16;
1578 var
->green
.offset
= 8;
1579 var
->blue
.offset
= 0;
1580 var
->red
.length
= 8;
1581 var
->green
.length
= 8;
1582 var
->blue
.length
= 8;
1583 var
->transp
.length
= 8;
1584 var
->transp
.offset
= 24;
1591 EXPORT_SYMBOL(drm_fb_helper_check_var
);
1594 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
1595 * @info: fbdev registered by the helper
1597 * This will let fbcon do the mode init and is called at initialization time by
1598 * the fbdev core when registering the driver, and later on through the hotplug
1601 int drm_fb_helper_set_par(struct fb_info
*info
)
1603 struct drm_fb_helper
*fb_helper
= info
->par
;
1604 struct fb_var_screeninfo
*var
= &info
->var
;
1606 if (oops_in_progress
)
1609 if (var
->pixclock
!= 0) {
1610 DRM_ERROR("PIXEL CLOCK SET\n");
1614 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper
);
1618 EXPORT_SYMBOL(drm_fb_helper_set_par
);
1620 static void pan_set(struct drm_fb_helper
*fb_helper
, int x
, int y
)
1624 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1625 struct drm_mode_set
*mode_set
;
1627 mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
1634 static int pan_display_atomic(struct fb_var_screeninfo
*var
,
1635 struct fb_info
*info
)
1637 struct drm_fb_helper
*fb_helper
= info
->par
;
1640 pan_set(fb_helper
, var
->xoffset
, var
->yoffset
);
1642 ret
= restore_fbdev_mode_atomic(fb_helper
, true);
1644 info
->var
.xoffset
= var
->xoffset
;
1645 info
->var
.yoffset
= var
->yoffset
;
1647 pan_set(fb_helper
, info
->var
.xoffset
, info
->var
.yoffset
);
1652 static int pan_display_legacy(struct fb_var_screeninfo
*var
,
1653 struct fb_info
*info
)
1655 struct drm_fb_helper
*fb_helper
= info
->par
;
1656 struct drm_mode_set
*modeset
;
1660 drm_modeset_lock_all(fb_helper
->dev
);
1661 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1662 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1664 modeset
->x
= var
->xoffset
;
1665 modeset
->y
= var
->yoffset
;
1667 if (modeset
->num_connectors
) {
1668 ret
= drm_mode_set_config_internal(modeset
);
1670 info
->var
.xoffset
= var
->xoffset
;
1671 info
->var
.yoffset
= var
->yoffset
;
1675 drm_modeset_unlock_all(fb_helper
->dev
);
1681 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
1682 * @var: updated screen information
1683 * @info: fbdev registered by the helper
1685 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
1686 struct fb_info
*info
)
1688 struct drm_fb_helper
*fb_helper
= info
->par
;
1689 struct drm_device
*dev
= fb_helper
->dev
;
1692 if (oops_in_progress
)
1695 mutex_lock(&fb_helper
->lock
);
1696 if (!drm_fb_helper_is_bound(fb_helper
)) {
1697 mutex_unlock(&fb_helper
->lock
);
1701 if (drm_drv_uses_atomic_modeset(dev
))
1702 ret
= pan_display_atomic(var
, info
);
1704 ret
= pan_display_legacy(var
, info
);
1705 mutex_unlock(&fb_helper
->lock
);
1709 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
1712 * Allocates the backing storage and sets up the fbdev info structure through
1713 * the ->fb_probe callback.
1715 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
1721 struct drm_fb_helper_surface_size sizes
;
1724 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
1725 sizes
.surface_depth
= 24;
1726 sizes
.surface_bpp
= 32;
1727 sizes
.fb_width
= (u32
)-1;
1728 sizes
.fb_height
= (u32
)-1;
1730 /* if driver picks 8 or 16 by default use that for both depth/bpp */
1731 if (preferred_bpp
!= sizes
.surface_bpp
)
1732 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
1734 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1735 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1736 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
1737 struct drm_cmdline_mode
*cmdline_mode
;
1739 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
1741 if (cmdline_mode
->bpp_specified
) {
1742 switch (cmdline_mode
->bpp
) {
1744 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
1747 sizes
.surface_depth
= 15;
1748 sizes
.surface_bpp
= 16;
1751 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
1754 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
1757 sizes
.surface_depth
= 24;
1758 sizes
.surface_bpp
= 32;
1766 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1767 struct drm_display_mode
*desired_mode
;
1768 struct drm_mode_set
*mode_set
;
1770 /* in case of tile group, are we the last tile vert or horiz?
1771 * If no tile group you are always the last one both vertically
1774 bool lastv
= true, lasth
= true;
1776 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
1777 mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
1784 x
= fb_helper
->crtc_info
[i
].x
;
1785 y
= fb_helper
->crtc_info
[i
].y
;
1787 if (gamma_size
== 0)
1788 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
1790 sizes
.surface_width
= max_t(u32
, desired_mode
->hdisplay
+ x
, sizes
.surface_width
);
1791 sizes
.surface_height
= max_t(u32
, desired_mode
->vdisplay
+ y
, sizes
.surface_height
);
1793 for (j
= 0; j
< mode_set
->num_connectors
; j
++) {
1794 struct drm_connector
*connector
= mode_set
->connectors
[j
];
1796 if (connector
->has_tile
) {
1797 lasth
= (connector
->tile_h_loc
== (connector
->num_h_tile
- 1));
1798 lastv
= (connector
->tile_v_loc
== (connector
->num_v_tile
- 1));
1799 /* cloning to multiple tiles is just crazy-talk, so: */
1805 sizes
.fb_width
= min_t(u32
, desired_mode
->hdisplay
+ x
, sizes
.fb_width
);
1807 sizes
.fb_height
= min_t(u32
, desired_mode
->vdisplay
+ y
, sizes
.fb_height
);
1810 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
1811 DRM_INFO("Cannot find any crtc or sizes\n");
1815 /* Handle our overallocation */
1816 sizes
.surface_height
*= drm_fbdev_overalloc
;
1817 sizes
.surface_height
/= 100;
1819 /* push down into drivers */
1820 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
1828 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1829 * @info: fbdev registered by the helper
1830 * @pitch: desired pitch
1831 * @depth: desired depth
1833 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1834 * fbdev emulations. Drivers which support acceleration methods which impose
1835 * additional constraints need to set up their own limits.
1837 * Drivers should call this (or their equivalent setup code) from their
1838 * &drm_fb_helper_funcs.fb_probe callback.
1840 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1843 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1844 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1845 FB_VISUAL_TRUECOLOR
;
1846 info
->fix
.mmio_start
= 0;
1847 info
->fix
.mmio_len
= 0;
1848 info
->fix
.type_aux
= 0;
1849 info
->fix
.xpanstep
= 1; /* doing it in hw */
1850 info
->fix
.ypanstep
= 1; /* doing it in hw */
1851 info
->fix
.ywrapstep
= 0;
1852 info
->fix
.accel
= FB_ACCEL_NONE
;
1854 info
->fix
.line_length
= pitch
;
1856 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1859 * drm_fb_helper_fill_var - initalizes variable fbdev information
1860 * @info: fbdev instance to set up
1861 * @fb_helper: fb helper instance to use as template
1862 * @fb_width: desired fb width
1863 * @fb_height: desired fb height
1865 * Sets up the variable fbdev metainformation from the given fb helper instance
1866 * and the drm framebuffer allocated in &drm_fb_helper.fb.
1868 * Drivers should call this (or their equivalent setup code) from their
1869 * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
1870 * backing storage framebuffer.
1872 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1873 uint32_t fb_width
, uint32_t fb_height
)
1875 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1877 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1878 info
->var
.xres_virtual
= fb
->width
;
1879 info
->var
.yres_virtual
= fb
->height
;
1880 info
->var
.bits_per_pixel
= fb
->format
->cpp
[0] * 8;
1881 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1882 info
->var
.xoffset
= 0;
1883 info
->var
.yoffset
= 0;
1884 info
->var
.activate
= FB_ACTIVATE_NOW
;
1886 switch (fb
->format
->depth
) {
1888 info
->var
.red
.offset
= 0;
1889 info
->var
.green
.offset
= 0;
1890 info
->var
.blue
.offset
= 0;
1891 info
->var
.red
.length
= 8; /* 8bit DAC */
1892 info
->var
.green
.length
= 8;
1893 info
->var
.blue
.length
= 8;
1894 info
->var
.transp
.offset
= 0;
1895 info
->var
.transp
.length
= 0;
1898 info
->var
.red
.offset
= 10;
1899 info
->var
.green
.offset
= 5;
1900 info
->var
.blue
.offset
= 0;
1901 info
->var
.red
.length
= 5;
1902 info
->var
.green
.length
= 5;
1903 info
->var
.blue
.length
= 5;
1904 info
->var
.transp
.offset
= 15;
1905 info
->var
.transp
.length
= 1;
1908 info
->var
.red
.offset
= 11;
1909 info
->var
.green
.offset
= 5;
1910 info
->var
.blue
.offset
= 0;
1911 info
->var
.red
.length
= 5;
1912 info
->var
.green
.length
= 6;
1913 info
->var
.blue
.length
= 5;
1914 info
->var
.transp
.offset
= 0;
1917 info
->var
.red
.offset
= 16;
1918 info
->var
.green
.offset
= 8;
1919 info
->var
.blue
.offset
= 0;
1920 info
->var
.red
.length
= 8;
1921 info
->var
.green
.length
= 8;
1922 info
->var
.blue
.length
= 8;
1923 info
->var
.transp
.offset
= 0;
1924 info
->var
.transp
.length
= 0;
1927 info
->var
.red
.offset
= 16;
1928 info
->var
.green
.offset
= 8;
1929 info
->var
.blue
.offset
= 0;
1930 info
->var
.red
.length
= 8;
1931 info
->var
.green
.length
= 8;
1932 info
->var
.blue
.length
= 8;
1933 info
->var
.transp
.offset
= 24;
1934 info
->var
.transp
.length
= 8;
1940 info
->var
.xres
= fb_width
;
1941 info
->var
.yres
= fb_height
;
1943 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1945 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1949 struct drm_connector
*connector
;
1952 drm_fb_helper_for_each_connector(fb_helper
, i
) {
1953 connector
= fb_helper
->connector_info
[i
]->connector
;
1954 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1960 struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1962 struct drm_display_mode
*mode
;
1964 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1965 if (mode
->hdisplay
> width
||
1966 mode
->vdisplay
> height
)
1968 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1973 EXPORT_SYMBOL(drm_has_preferred_mode
);
1975 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1977 return fb_connector
->connector
->cmdline_mode
.specified
;
1980 struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
)
1982 struct drm_cmdline_mode
*cmdline_mode
;
1983 struct drm_display_mode
*mode
;
1984 bool prefer_non_interlace
;
1986 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
1987 if (cmdline_mode
->specified
== false)
1990 /* attempt to find a matching mode in the list of modes
1991 * we have gotten so far, if not add a CVT mode that conforms
1993 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1996 prefer_non_interlace
= !cmdline_mode
->interlace
;
1998 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1999 /* check width/height */
2000 if (mode
->hdisplay
!= cmdline_mode
->xres
||
2001 mode
->vdisplay
!= cmdline_mode
->yres
)
2004 if (cmdline_mode
->refresh_specified
) {
2005 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
2009 if (cmdline_mode
->interlace
) {
2010 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
2012 } else if (prefer_non_interlace
) {
2013 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
2019 if (prefer_non_interlace
) {
2020 prefer_non_interlace
= false;
2025 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
2027 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
2030 EXPORT_SYMBOL(drm_pick_cmdline_mode
);
2032 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
2036 if (connector
->display_info
.non_desktop
)
2040 enable
= connector
->status
== connector_status_connected
;
2042 enable
= connector
->status
!= connector_status_disconnected
;
2047 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
2050 bool any_enabled
= false;
2051 struct drm_connector
*connector
;
2054 drm_fb_helper_for_each_connector(fb_helper
, i
) {
2055 connector
= fb_helper
->connector_info
[i
]->connector
;
2056 enabled
[i
] = drm_connector_enabled(connector
, true);
2057 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
2058 connector
->display_info
.non_desktop
? "non desktop" : enabled
[i
] ? "yes" : "no");
2060 any_enabled
|= enabled
[i
];
2066 drm_fb_helper_for_each_connector(fb_helper
, i
) {
2067 connector
= fb_helper
->connector_info
[i
]->connector
;
2068 enabled
[i
] = drm_connector_enabled(connector
, false);
2072 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
2073 struct drm_display_mode
**modes
,
2074 struct drm_fb_offset
*offsets
,
2075 bool *enabled
, int width
, int height
)
2078 bool can_clone
= false;
2079 struct drm_fb_helper_connector
*fb_helper_conn
;
2080 struct drm_display_mode
*dmt_mode
, *mode
;
2082 /* only contemplate cloning in the single crtc case */
2083 if (fb_helper
->crtc_count
> 1)
2087 drm_fb_helper_for_each_connector(fb_helper
, i
) {
2092 /* only contemplate cloning if more than one connector is enabled */
2096 /* check the command line or if nothing common pick 1024x768 */
2098 drm_fb_helper_for_each_connector(fb_helper
, i
) {
2101 fb_helper_conn
= fb_helper
->connector_info
[i
];
2102 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
);
2107 for (j
= 0; j
< i
; j
++) {
2110 if (!drm_mode_equal(modes
[j
], modes
[i
]))
2116 DRM_DEBUG_KMS("can clone using command line\n");
2120 /* try and find a 1024x768 mode on each connector */
2122 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
2124 drm_fb_helper_for_each_connector(fb_helper
, i
) {
2128 fb_helper_conn
= fb_helper
->connector_info
[i
];
2129 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
2130 if (drm_mode_equal(mode
, dmt_mode
))
2138 DRM_DEBUG_KMS("can clone using 1024x768\n");
2141 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
2145 static int drm_get_tile_offsets(struct drm_fb_helper
*fb_helper
,
2146 struct drm_display_mode
**modes
,
2147 struct drm_fb_offset
*offsets
,
2149 int h_idx
, int v_idx
)
2151 struct drm_fb_helper_connector
*fb_helper_conn
;
2153 int hoffset
= 0, voffset
= 0;
2155 drm_fb_helper_for_each_connector(fb_helper
, i
) {
2156 fb_helper_conn
= fb_helper
->connector_info
[i
];
2157 if (!fb_helper_conn
->connector
->has_tile
)
2160 if (!modes
[i
] && (h_idx
|| v_idx
)) {
2161 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i
,
2162 fb_helper_conn
->connector
->base
.id
);
2165 if (fb_helper_conn
->connector
->tile_h_loc
< h_idx
)
2166 hoffset
+= modes
[i
]->hdisplay
;
2168 if (fb_helper_conn
->connector
->tile_v_loc
< v_idx
)
2169 voffset
+= modes
[i
]->vdisplay
;
2171 offsets
[idx
].x
= hoffset
;
2172 offsets
[idx
].y
= voffset
;
2173 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset
, voffset
, h_idx
, v_idx
);
2177 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
2178 struct drm_display_mode
**modes
,
2179 struct drm_fb_offset
*offsets
,
2180 bool *enabled
, int width
, int height
)
2182 struct drm_fb_helper_connector
*fb_helper_conn
;
2183 const u64 mask
= BIT_ULL(fb_helper
->connector_count
) - 1;
2184 u64 conn_configured
= 0;
2189 drm_fb_helper_for_each_connector(fb_helper
, i
) {
2190 fb_helper_conn
= fb_helper
->connector_info
[i
];
2192 if (conn_configured
& BIT_ULL(i
))
2195 if (enabled
[i
] == false) {
2196 conn_configured
|= BIT_ULL(i
);
2200 /* first pass over all the untiled connectors */
2201 if (tile_pass
== 0 && fb_helper_conn
->connector
->has_tile
)
2204 if (tile_pass
== 1) {
2205 if (fb_helper_conn
->connector
->tile_h_loc
!= 0 ||
2206 fb_helper_conn
->connector
->tile_v_loc
!= 0)
2210 if (fb_helper_conn
->connector
->tile_h_loc
!= tile_pass
- 1 &&
2211 fb_helper_conn
->connector
->tile_v_loc
!= tile_pass
- 1)
2212 /* if this tile_pass doesn't cover any of the tiles - keep going */
2216 * find the tile offsets for this pass - need to find
2217 * all tiles left and above
2219 drm_get_tile_offsets(fb_helper
, modes
, offsets
,
2220 i
, fb_helper_conn
->connector
->tile_h_loc
, fb_helper_conn
->connector
->tile_v_loc
);
2222 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
2223 fb_helper_conn
->connector
->base
.id
);
2225 /* got for command line mode first */
2226 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
);
2228 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
2229 fb_helper_conn
->connector
->base
.id
, fb_helper_conn
->connector
->tile_group
? fb_helper_conn
->connector
->tile_group
->id
: 0);
2230 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
2232 /* No preferred modes, pick one off the list */
2233 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
2234 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
2237 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
2239 conn_configured
|= BIT_ULL(i
);
2242 if ((conn_configured
& mask
) != mask
) {
2249 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
2250 struct drm_fb_helper_crtc
**best_crtcs
,
2251 struct drm_display_mode
**modes
,
2252 int n
, int width
, int height
)
2255 struct drm_connector
*connector
;
2256 const struct drm_connector_helper_funcs
*connector_funcs
;
2257 struct drm_encoder
*encoder
;
2258 int my_score
, best_score
, score
;
2259 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
2260 struct drm_fb_helper_connector
*fb_helper_conn
;
2262 if (n
== fb_helper
->connector_count
)
2265 fb_helper_conn
= fb_helper
->connector_info
[n
];
2266 connector
= fb_helper_conn
->connector
;
2268 best_crtcs
[n
] = NULL
;
2269 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
2270 if (modes
[n
] == NULL
)
2273 crtcs
= kcalloc(fb_helper
->connector_count
,
2274 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
2279 if (connector
->status
== connector_status_connected
)
2281 if (drm_has_cmdline_mode(fb_helper_conn
))
2283 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
2286 connector_funcs
= connector
->helper_private
;
2289 * If the DRM device implements atomic hooks and ->best_encoder() is
2290 * NULL we fallback to the default drm_atomic_helper_best_encoder()
2293 if (drm_drv_uses_atomic_modeset(fb_helper
->dev
) &&
2294 !connector_funcs
->best_encoder
)
2295 encoder
= drm_atomic_helper_best_encoder(connector
);
2297 encoder
= connector_funcs
->best_encoder(connector
);
2303 * select a crtc for this connector and then attempt to configure
2304 * remaining connectors
2306 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
2307 crtc
= &fb_helper
->crtc_info
[c
];
2309 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
2312 for (o
= 0; o
< n
; o
++)
2313 if (best_crtcs
[o
] == crtc
)
2317 /* ignore cloning unless only a single crtc */
2318 if (fb_helper
->crtc_count
> 1)
2321 if (!drm_mode_equal(modes
[o
], modes
[n
]))
2326 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
2327 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
2329 if (score
> best_score
) {
2331 memcpy(best_crtcs
, crtcs
,
2332 fb_helper
->connector_count
*
2333 sizeof(struct drm_fb_helper_crtc
*));
2341 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
,
2342 u32 width
, u32 height
)
2344 struct drm_device
*dev
= fb_helper
->dev
;
2345 struct drm_fb_helper_crtc
**crtcs
;
2346 struct drm_display_mode
**modes
;
2347 struct drm_fb_offset
*offsets
;
2351 DRM_DEBUG_KMS("\n");
2352 /* prevent concurrent modification of connector_count by hotplug */
2353 lockdep_assert_held(&fb_helper
->lock
);
2355 crtcs
= kcalloc(fb_helper
->connector_count
,
2356 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
2357 modes
= kcalloc(fb_helper
->connector_count
,
2358 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
2359 offsets
= kcalloc(fb_helper
->connector_count
,
2360 sizeof(struct drm_fb_offset
), GFP_KERNEL
);
2361 enabled
= kcalloc(fb_helper
->connector_count
,
2362 sizeof(bool), GFP_KERNEL
);
2363 if (!crtcs
|| !modes
|| !enabled
|| !offsets
) {
2364 DRM_ERROR("Memory allocation failed\n");
2368 mutex_lock(&fb_helper
->dev
->mode_config
.mutex
);
2369 if (drm_fb_helper_probe_connector_modes(fb_helper
, width
, height
) == 0)
2370 DRM_DEBUG_KMS("No connectors reported connected with modes\n");
2371 drm_enable_connectors(fb_helper
, enabled
);
2373 if (!(fb_helper
->funcs
->initial_config
&&
2374 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
2376 enabled
, width
, height
))) {
2377 memset(modes
, 0, fb_helper
->connector_count
*sizeof(modes
[0]));
2378 memset(crtcs
, 0, fb_helper
->connector_count
*sizeof(crtcs
[0]));
2379 memset(offsets
, 0, fb_helper
->connector_count
*sizeof(offsets
[0]));
2381 if (!drm_target_cloned(fb_helper
, modes
, offsets
,
2382 enabled
, width
, height
) &&
2383 !drm_target_preferred(fb_helper
, modes
, offsets
,
2384 enabled
, width
, height
))
2385 DRM_ERROR("Unable to find initial modes\n");
2387 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2390 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
2392 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
2394 /* need to set the modesets up here for use later */
2395 /* fill out the connector<->crtc mappings into the modesets */
2396 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
2397 drm_fb_helper_modeset_release(fb_helper
,
2398 &fb_helper
->crtc_info
[i
].mode_set
);
2400 drm_fb_helper_for_each_connector(fb_helper
, i
) {
2401 struct drm_display_mode
*mode
= modes
[i
];
2402 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
2403 struct drm_fb_offset
*offset
= &offsets
[i
];
2405 if (mode
&& fb_crtc
) {
2406 struct drm_mode_set
*modeset
= &fb_crtc
->mode_set
;
2407 struct drm_connector
*connector
=
2408 fb_helper
->connector_info
[i
]->connector
;
2410 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2411 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
, offset
->x
, offset
->y
);
2413 fb_crtc
->desired_mode
= mode
;
2414 fb_crtc
->x
= offset
->x
;
2415 fb_crtc
->y
= offset
->y
;
2416 modeset
->mode
= drm_mode_duplicate(dev
,
2417 fb_crtc
->desired_mode
);
2418 drm_connector_get(connector
);
2419 modeset
->connectors
[modeset
->num_connectors
++] = connector
;
2420 modeset
->x
= offset
->x
;
2421 modeset
->y
= offset
->y
;
2432 * This is a continuation of drm_setup_crtcs() that sets up anything related
2433 * to the framebuffer. During initialization, drm_setup_crtcs() is called before
2434 * the framebuffer has been allocated (fb_helper->fb and fb_helper->fbdev).
2435 * So, any setup that touches those fields needs to be done here instead of in
2436 * drm_setup_crtcs().
2438 static void drm_setup_crtcs_fb(struct drm_fb_helper
*fb_helper
)
2440 struct fb_info
*info
= fb_helper
->fbdev
;
2443 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
2444 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
2445 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
2447 mutex_lock(&fb_helper
->dev
->mode_config
.mutex
);
2448 drm_fb_helper_for_each_connector(fb_helper
, i
) {
2449 struct drm_connector
*connector
=
2450 fb_helper
->connector_info
[i
]->connector
;
2452 /* use first connected connector for the physical dimensions */
2453 if (connector
->status
== connector_status_connected
) {
2454 info
->var
.width
= connector
->display_info
.width_mm
;
2455 info
->var
.height
= connector
->display_info
.height_mm
;
2459 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
2462 /* Note: Drops fb_helper->lock before returning. */
2464 __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper
*fb_helper
,
2467 struct drm_device
*dev
= fb_helper
->dev
;
2468 struct fb_info
*info
;
2469 unsigned int width
, height
;
2472 width
= dev
->mode_config
.max_width
;
2473 height
= dev
->mode_config
.max_height
;
2475 drm_setup_crtcs(fb_helper
, width
, height
);
2476 ret
= drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
2478 if (ret
== -EAGAIN
) {
2479 fb_helper
->preferred_bpp
= bpp_sel
;
2480 fb_helper
->deferred_setup
= true;
2483 mutex_unlock(&fb_helper
->lock
);
2487 drm_setup_crtcs_fb(fb_helper
);
2489 fb_helper
->deferred_setup
= false;
2491 info
= fb_helper
->fbdev
;
2492 info
->var
.pixclock
= 0;
2494 /* Need to drop locks to avoid recursive deadlock in
2495 * register_framebuffer. This is ok because the only thing left to do is
2496 * register the fbdev emulation instance in kernel_fb_helper_list. */
2497 mutex_unlock(&fb_helper
->lock
);
2499 ret
= register_framebuffer(info
);
2503 dev_info(dev
->dev
, "fb%d: %s frame buffer device\n",
2504 info
->node
, info
->fix
.id
);
2506 mutex_lock(&kernel_fb_helper_lock
);
2507 if (list_empty(&kernel_fb_helper_list
))
2508 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
2510 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
2511 mutex_unlock(&kernel_fb_helper_lock
);
2517 * drm_fb_helper_initial_config - setup a sane initial connector configuration
2518 * @fb_helper: fb_helper device struct
2519 * @bpp_sel: bpp value to use for the framebuffer configuration
2521 * Scans the CRTCs and connectors and tries to put together an initial setup.
2522 * At the moment, this is a cloned configuration across all heads with
2523 * a new framebuffer object as the backing store.
2525 * Note that this also registers the fbdev and so allows userspace to call into
2526 * the driver through the fbdev interfaces.
2528 * This function will call down into the &drm_fb_helper_funcs.fb_probe callback
2529 * to let the driver allocate and initialize the fbdev info structure and the
2530 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2531 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2532 * values for the fbdev info structure.
2536 * When you have fbcon support built-in or already loaded, this function will do
2537 * a full modeset to setup the fbdev console. Due to locking misdesign in the
2538 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2539 * console_lock. Until console_unlock is called no dmesg lines will be sent out
2540 * to consoles, not even serial console. This means when your driver crashes,
2541 * you will see absolutely nothing else but a system stuck in this function,
2542 * with no further output. Any kind of printk() you place within your own driver
2543 * or in the drm core modeset code will also never show up.
2545 * Standard debug practice is to run the fbcon setup without taking the
2546 * console_lock as a hack, to be able to see backtraces and crashes on the
2547 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2550 * The other option is to just disable fbdev emulation since very likely the
2551 * first modeset from userspace will crash in the same way, and is even easier
2552 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2553 * kernel cmdline option.
2556 * Zero if everything went ok, nonzero otherwise.
2558 int drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
2562 if (!drm_fbdev_emulation
)
2565 mutex_lock(&fb_helper
->lock
);
2566 ret
= __drm_fb_helper_initial_config_and_unlock(fb_helper
, bpp_sel
);
2570 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
2573 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2574 * probing all the outputs attached to the fb
2575 * @fb_helper: the drm_fb_helper
2577 * Scan the connectors attached to the fb_helper and try to put together a
2578 * setup after notification of a change in output configuration.
2580 * Called at runtime, takes the mode config locks to be able to check/change the
2581 * modeset configuration. Must be run from process context (which usually means
2582 * either the output polling work or a work item launched from the driver's
2583 * hotplug interrupt).
2585 * Note that drivers may call this even before calling
2586 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2587 * for a race-free fbcon setup and will make sure that the fbdev emulation will
2588 * not miss any hotplug events.
2591 * 0 on success and a non-zero error code otherwise.
2593 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
2597 if (!drm_fbdev_emulation
)
2600 mutex_lock(&fb_helper
->lock
);
2601 if (fb_helper
->deferred_setup
) {
2602 err
= __drm_fb_helper_initial_config_and_unlock(fb_helper
,
2603 fb_helper
->preferred_bpp
);
2607 if (!fb_helper
->fb
|| !drm_fb_helper_is_bound(fb_helper
)) {
2608 fb_helper
->delayed_hotplug
= true;
2609 mutex_unlock(&fb_helper
->lock
);
2613 DRM_DEBUG_KMS("\n");
2615 drm_setup_crtcs(fb_helper
, fb_helper
->fb
->width
, fb_helper
->fb
->height
);
2616 drm_setup_crtcs_fb(fb_helper
);
2617 mutex_unlock(&fb_helper
->lock
);
2619 drm_fb_helper_set_par(fb_helper
->fbdev
);
2623 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
2625 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2626 * but the module doesn't depend on any fb console symbols. At least
2627 * attempt to load fbcon to avoid leaving the system without a usable console.
2629 int __init
drm_fb_helper_modinit(void)
2631 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2632 const char name
[] = "fbcon";
2633 struct module
*fbcon
;
2635 mutex_lock(&module_mutex
);
2636 fbcon
= find_module(name
);
2637 mutex_unlock(&module_mutex
);
2640 request_module_nowait(name
);
2644 EXPORT_SYMBOL(drm_fb_helper_modinit
);