2 * Copyright (c) 2006-2009 Red Hat Inc.
3 * Copyright (c) 2006-2008 Intel Corporation
4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
6 * DRM framebuffer helper functions
8 * Permission to use, copy, modify, distribute, and sell this software and its
9 * documentation for any purpose is hereby granted without fee, provided that
10 * the above copyright notice appear in all copies and that both that copyright
11 * notice and this permission notice appear in supporting documentation, and
12 * that the name of the copyright holders not be used in advertising or
13 * publicity pertaining to distribution of the software without specific,
14 * written prior permission. The copyright holders make no representations
15 * about the suitability of this software for any purpose. It is provided "as
16 * is" without express or implied warranty.
18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32 #include <linux/kernel.h>
33 #include <linux/sysrq.h>
34 #include <linux/slab.h>
36 #include <linux/module.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_crtc_helper.h>
42 static LIST_HEAD(kernel_fb_helper_list
);
47 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
48 * mode setting driver. They can be used mostly independently from the crtc
49 * helper functions used by many drivers to implement the kernel mode setting
52 * Initialization is done as a four-step process with drm_fb_helper_prepare(),
53 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
54 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
55 * default behaviour can override the third step with their own code.
56 * Teardown is done with drm_fb_helper_fini().
58 * At runtime drivers should restore the fbdev console by calling
59 * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
60 * They should also notify the fb helper code from updates to the output
61 * configuration by calling drm_fb_helper_hotplug_event(). For easier
62 * integration with the output polling code in drm_crtc_helper.c the modeset
63 * code provides a ->output_poll_changed callback.
65 * All other functions exported by the fb helper library can be used to
66 * implement the fbdev driver interface by the driver.
68 * It is possible, though perhaps somewhat tricky, to implement race-free
69 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
70 * helper must be called first to initialize the minimum required to make
71 * hotplug detection work. Drivers also need to make sure to properly set up
72 * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
73 * it is safe to enable interrupts and start processing hotplug events. At the
74 * same time, drivers should initialize all modeset objects such as CRTCs,
75 * encoders and connectors. To finish up the fbdev helper initialization, the
76 * drm_fb_helper_init() function is called. To probe for all attached displays
77 * and set up an initial configuration using the detected hardware, drivers
78 * should call drm_fb_helper_single_add_all_connectors() followed by
79 * drm_fb_helper_initial_config().
83 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
85 * @fb_helper: fbdev initialized with drm_fb_helper_init
87 * This functions adds all the available connectors for use with the given
88 * fb_helper. This is a separate step to allow drivers to freely assign
89 * connectors to the fbdev, e.g. if some are reserved for special purposes or
90 * not adequate to be used for the fbcon.
92 * This function is protected against concurrent connector hotadds/removals
93 * using drm_fb_helper_add_one_connector() and
94 * drm_fb_helper_remove_one_connector().
96 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper
*fb_helper
)
98 struct drm_device
*dev
= fb_helper
->dev
;
99 struct drm_connector
*connector
;
102 mutex_lock(&dev
->mode_config
.mutex
);
103 drm_for_each_connector(connector
, dev
) {
104 struct drm_fb_helper_connector
*fb_helper_connector
;
106 fb_helper_connector
= kzalloc(sizeof(struct drm_fb_helper_connector
), GFP_KERNEL
);
107 if (!fb_helper_connector
)
110 fb_helper_connector
->connector
= connector
;
111 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_helper_connector
;
113 mutex_unlock(&dev
->mode_config
.mutex
);
116 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
117 kfree(fb_helper
->connector_info
[i
]);
118 fb_helper
->connector_info
[i
] = NULL
;
120 fb_helper
->connector_count
= 0;
121 mutex_unlock(&dev
->mode_config
.mutex
);
125 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors
);
127 int drm_fb_helper_add_one_connector(struct drm_fb_helper
*fb_helper
, struct drm_connector
*connector
)
129 struct drm_fb_helper_connector
**temp
;
130 struct drm_fb_helper_connector
*fb_helper_connector
;
132 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
133 if (fb_helper
->connector_count
+ 1 > fb_helper
->connector_info_alloc_count
) {
134 temp
= krealloc(fb_helper
->connector_info
, sizeof(struct drm_fb_helper_connector
*) * (fb_helper
->connector_count
+ 1), GFP_KERNEL
);
138 fb_helper
->connector_info_alloc_count
= fb_helper
->connector_count
+ 1;
139 fb_helper
->connector_info
= temp
;
143 fb_helper_connector
= kzalloc(sizeof(struct drm_fb_helper_connector
), GFP_KERNEL
);
144 if (!fb_helper_connector
)
147 fb_helper_connector
->connector
= connector
;
148 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_helper_connector
;
151 EXPORT_SYMBOL(drm_fb_helper_add_one_connector
);
153 static void remove_from_modeset(struct drm_mode_set
*set
,
154 struct drm_connector
*connector
)
158 for (i
= 0; i
< set
->num_connectors
; i
++) {
159 if (set
->connectors
[i
] == connector
)
163 if (i
== set
->num_connectors
)
166 for (j
= i
+ 1; j
< set
->num_connectors
; j
++) {
167 set
->connectors
[j
- 1] = set
->connectors
[j
];
169 set
->num_connectors
--;
172 * TODO maybe need to makes sure we set it back to !=NULL somewhere?
174 if (set
->num_connectors
== 0) {
176 drm_mode_destroy(connector
->dev
, set
->mode
);
181 int drm_fb_helper_remove_one_connector(struct drm_fb_helper
*fb_helper
,
182 struct drm_connector
*connector
)
184 struct drm_fb_helper_connector
*fb_helper_connector
;
187 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
189 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
190 if (fb_helper
->connector_info
[i
]->connector
== connector
)
194 if (i
== fb_helper
->connector_count
)
196 fb_helper_connector
= fb_helper
->connector_info
[i
];
198 for (j
= i
+ 1; j
< fb_helper
->connector_count
; j
++) {
199 fb_helper
->connector_info
[j
- 1] = fb_helper
->connector_info
[j
];
201 fb_helper
->connector_count
--;
202 kfree(fb_helper_connector
);
204 /* also cleanup dangling references to the connector: */
205 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
206 remove_from_modeset(&fb_helper
->crtc_info
[i
].mode_set
, connector
);
210 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector
);
212 static void drm_fb_helper_save_lut_atomic(struct drm_crtc
*crtc
, struct drm_fb_helper
*helper
)
214 uint16_t *r_base
, *g_base
, *b_base
;
217 if (helper
->funcs
->gamma_get
== NULL
)
220 r_base
= crtc
->gamma_store
;
221 g_base
= r_base
+ crtc
->gamma_size
;
222 b_base
= g_base
+ crtc
->gamma_size
;
224 for (i
= 0; i
< crtc
->gamma_size
; i
++)
225 helper
->funcs
->gamma_get(crtc
, &r_base
[i
], &g_base
[i
], &b_base
[i
], i
);
228 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc
*crtc
)
230 uint16_t *r_base
, *g_base
, *b_base
;
232 if (crtc
->funcs
->gamma_set
== NULL
)
235 r_base
= crtc
->gamma_store
;
236 g_base
= r_base
+ crtc
->gamma_size
;
237 b_base
= g_base
+ crtc
->gamma_size
;
239 crtc
->funcs
->gamma_set(crtc
, r_base
, g_base
, b_base
, 0, crtc
->gamma_size
);
243 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
244 * @info: fbdev registered by the helper
246 int drm_fb_helper_debug_enter(struct fb_info
*info
)
248 struct drm_fb_helper
*helper
= info
->par
;
249 const struct drm_crtc_helper_funcs
*funcs
;
252 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
253 for (i
= 0; i
< helper
->crtc_count
; i
++) {
254 struct drm_mode_set
*mode_set
=
255 &helper
->crtc_info
[i
].mode_set
;
257 if (!mode_set
->crtc
->enabled
)
260 funcs
= mode_set
->crtc
->helper_private
;
261 drm_fb_helper_save_lut_atomic(mode_set
->crtc
, helper
);
262 funcs
->mode_set_base_atomic(mode_set
->crtc
,
266 ENTER_ATOMIC_MODE_SET
);
272 EXPORT_SYMBOL(drm_fb_helper_debug_enter
);
274 /* Find the real fb for a given fb helper CRTC */
275 static struct drm_framebuffer
*drm_mode_config_fb(struct drm_crtc
*crtc
)
277 struct drm_device
*dev
= crtc
->dev
;
280 drm_for_each_crtc(c
, dev
) {
281 if (crtc
->base
.id
== c
->base
.id
)
282 return c
->primary
->fb
;
289 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
290 * @info: fbdev registered by the helper
292 int drm_fb_helper_debug_leave(struct fb_info
*info
)
294 struct drm_fb_helper
*helper
= info
->par
;
295 struct drm_crtc
*crtc
;
296 const struct drm_crtc_helper_funcs
*funcs
;
297 struct drm_framebuffer
*fb
;
300 for (i
= 0; i
< helper
->crtc_count
; i
++) {
301 struct drm_mode_set
*mode_set
= &helper
->crtc_info
[i
].mode_set
;
302 crtc
= mode_set
->crtc
;
303 funcs
= crtc
->helper_private
;
304 fb
= drm_mode_config_fb(crtc
);
310 DRM_ERROR("no fb to restore??\n");
314 drm_fb_helper_restore_lut_atomic(mode_set
->crtc
);
315 funcs
->mode_set_base_atomic(mode_set
->crtc
, fb
, crtc
->x
,
316 crtc
->y
, LEAVE_ATOMIC_MODE_SET
);
321 EXPORT_SYMBOL(drm_fb_helper_debug_leave
);
323 static bool restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
325 struct drm_device
*dev
= fb_helper
->dev
;
326 struct drm_plane
*plane
;
330 drm_warn_on_modeset_not_all_locked(dev
);
332 drm_for_each_plane(plane
, dev
) {
333 if (plane
->type
!= DRM_PLANE_TYPE_PRIMARY
)
334 drm_plane_force_disable(plane
);
336 if (dev
->mode_config
.rotation_property
) {
337 drm_mode_plane_set_obj_prop(plane
,
338 dev
->mode_config
.rotation_property
,
343 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
344 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
345 struct drm_crtc
*crtc
= mode_set
->crtc
;
348 if (crtc
->funcs
->cursor_set
) {
349 ret
= crtc
->funcs
->cursor_set(crtc
, NULL
, 0, 0, 0);
354 ret
= drm_mode_set_config_internal(mode_set
);
362 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
363 * @fb_helper: fbcon to restore
365 * This should be called from driver's drm ->lastclose callback
366 * when implementing an fbcon on top of kms using this helper. This ensures that
367 * the user isn't greeted with a black screen when e.g. X dies.
369 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper
*fb_helper
)
371 struct drm_device
*dev
= fb_helper
->dev
;
373 bool do_delayed
= false;
375 drm_modeset_lock_all(dev
);
376 ret
= restore_fbdev_mode(fb_helper
);
378 do_delayed
= fb_helper
->delayed_hotplug
;
380 fb_helper
->delayed_hotplug
= false;
381 drm_modeset_unlock_all(dev
);
384 drm_fb_helper_hotplug_event(fb_helper
);
387 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked
);
389 static bool drm_fb_helper_is_bound(struct drm_fb_helper
*fb_helper
)
391 struct drm_device
*dev
= fb_helper
->dev
;
392 struct drm_crtc
*crtc
;
393 int bound
= 0, crtcs_bound
= 0;
395 /* Sometimes user space wants everything disabled, so don't steal the
396 * display if there's a master. */
397 if (dev
->primary
->master
)
400 drm_for_each_crtc(crtc
, dev
) {
401 if (crtc
->primary
->fb
)
403 if (crtc
->primary
->fb
== fb_helper
->fb
)
407 if (bound
< crtcs_bound
)
413 #ifdef CONFIG_MAGIC_SYSRQ
415 * restore fbcon display for all kms driver's using this helper, used for sysrq
416 * and panic handling.
418 static bool drm_fb_helper_force_kernel_mode(void)
420 bool ret
, error
= false;
421 struct drm_fb_helper
*helper
;
423 if (list_empty(&kernel_fb_helper_list
))
426 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
427 struct drm_device
*dev
= helper
->dev
;
429 if (dev
->switch_power_state
== DRM_SWITCH_POWER_OFF
)
432 drm_modeset_lock_all(dev
);
433 ret
= restore_fbdev_mode(helper
);
436 drm_modeset_unlock_all(dev
);
441 static void drm_fb_helper_restore_work_fn(struct work_struct
*ignored
)
444 ret
= drm_fb_helper_force_kernel_mode();
446 DRM_ERROR("Failed to restore crtc configuration\n");
448 static DECLARE_WORK(drm_fb_helper_restore_work
, drm_fb_helper_restore_work_fn
);
450 static void drm_fb_helper_sysrq(int dummy1
)
452 schedule_work(&drm_fb_helper_restore_work
);
455 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
456 .handler
= drm_fb_helper_sysrq
,
457 .help_msg
= "force-fb(V)",
458 .action_msg
= "Restore framebuffer console",
461 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= { };
464 static void drm_fb_helper_dpms(struct fb_info
*info
, int dpms_mode
)
466 struct drm_fb_helper
*fb_helper
= info
->par
;
467 struct drm_device
*dev
= fb_helper
->dev
;
468 struct drm_crtc
*crtc
;
469 struct drm_connector
*connector
;
473 * For each CRTC in this fb, turn the connectors on/off.
475 drm_modeset_lock_all(dev
);
476 if (!drm_fb_helper_is_bound(fb_helper
)) {
477 drm_modeset_unlock_all(dev
);
481 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
482 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
487 /* Walk the connectors & encoders on this fb turning them on/off */
488 for (j
= 0; j
< fb_helper
->connector_count
; j
++) {
489 connector
= fb_helper
->connector_info
[j
]->connector
;
490 connector
->funcs
->dpms(connector
, dpms_mode
);
491 drm_object_property_set_value(&connector
->base
,
492 dev
->mode_config
.dpms_property
, dpms_mode
);
495 drm_modeset_unlock_all(dev
);
499 * drm_fb_helper_blank - implementation for ->fb_blank
500 * @blank: desired blanking state
501 * @info: fbdev registered by the helper
503 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
505 if (oops_in_progress
)
509 /* Display: On; HSync: On, VSync: On */
510 case FB_BLANK_UNBLANK
:
511 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
513 /* Display: Off; HSync: On, VSync: On */
514 case FB_BLANK_NORMAL
:
515 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
517 /* Display: Off; HSync: Off, VSync: On */
518 case FB_BLANK_HSYNC_SUSPEND
:
519 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
521 /* Display: Off; HSync: On, VSync: Off */
522 case FB_BLANK_VSYNC_SUSPEND
:
523 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
525 /* Display: Off; HSync: Off, VSync: Off */
526 case FB_BLANK_POWERDOWN
:
527 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
532 EXPORT_SYMBOL(drm_fb_helper_blank
);
534 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
538 for (i
= 0; i
< helper
->connector_count
; i
++)
539 kfree(helper
->connector_info
[i
]);
540 kfree(helper
->connector_info
);
541 for (i
= 0; i
< helper
->crtc_count
; i
++) {
542 kfree(helper
->crtc_info
[i
].mode_set
.connectors
);
543 if (helper
->crtc_info
[i
].mode_set
.mode
)
544 drm_mode_destroy(helper
->dev
, helper
->crtc_info
[i
].mode_set
.mode
);
546 kfree(helper
->crtc_info
);
550 * drm_fb_helper_prepare - setup a drm_fb_helper structure
552 * @helper: driver-allocated fbdev helper structure to set up
553 * @funcs: pointer to structure of functions associate with this helper
555 * Sets up the bare minimum to make the framebuffer helper usable. This is
556 * useful to implement race-free initialization of the polling helpers.
558 void drm_fb_helper_prepare(struct drm_device
*dev
, struct drm_fb_helper
*helper
,
559 const struct drm_fb_helper_funcs
*funcs
)
561 INIT_LIST_HEAD(&helper
->kernel_fb_list
);
562 helper
->funcs
= funcs
;
565 EXPORT_SYMBOL(drm_fb_helper_prepare
);
568 * drm_fb_helper_init - initialize a drm_fb_helper structure
570 * @fb_helper: driver-allocated fbdev helper structure to initialize
571 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
572 * @max_conn_count: max connector count
574 * This allocates the structures for the fbdev helper with the given limits.
575 * Note that this won't yet touch the hardware (through the driver interfaces)
576 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
577 * to allow driver writes more control over the exact init sequence.
579 * Drivers must call drm_fb_helper_prepare() before calling this function.
582 * Zero if everything went ok, nonzero otherwise.
584 int drm_fb_helper_init(struct drm_device
*dev
,
585 struct drm_fb_helper
*fb_helper
,
586 int crtc_count
, int max_conn_count
)
588 struct drm_crtc
*crtc
;
594 fb_helper
->crtc_info
= kcalloc(crtc_count
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
595 if (!fb_helper
->crtc_info
)
598 fb_helper
->crtc_count
= crtc_count
;
599 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
600 if (!fb_helper
->connector_info
) {
601 kfree(fb_helper
->crtc_info
);
604 fb_helper
->connector_info_alloc_count
= dev
->mode_config
.num_connector
;
605 fb_helper
->connector_count
= 0;
607 for (i
= 0; i
< crtc_count
; i
++) {
608 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
609 kcalloc(max_conn_count
,
610 sizeof(struct drm_connector
*),
613 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
615 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
619 drm_for_each_crtc(crtc
, dev
) {
620 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
626 drm_fb_helper_crtc_free(fb_helper
);
629 EXPORT_SYMBOL(drm_fb_helper_init
);
632 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
633 * @fb_helper: driver-allocated fbdev helper
635 * A helper to alloc fb_info and the members cmap and apertures. Called
636 * by the driver within the fb_probe fb_helper callback function.
639 * fb_info pointer if things went okay, pointer containing error code
642 struct fb_info
*drm_fb_helper_alloc_fbi(struct drm_fb_helper
*fb_helper
)
644 struct device
*dev
= fb_helper
->dev
->dev
;
645 struct fb_info
*info
;
648 info
= framebuffer_alloc(0, dev
);
650 return ERR_PTR(-ENOMEM
);
652 ret
= fb_alloc_cmap(&info
->cmap
, 256, 0);
656 info
->apertures
= alloc_apertures(1);
657 if (!info
->apertures
) {
662 fb_helper
->fbdev
= info
;
667 fb_dealloc_cmap(&info
->cmap
);
669 framebuffer_release(info
);
672 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi
);
675 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
676 * @fb_helper: driver-allocated fbdev helper
678 * A wrapper around unregister_framebuffer, to release the fb_info
681 void drm_fb_helper_unregister_fbi(struct drm_fb_helper
*fb_helper
)
683 if (fb_helper
&& fb_helper
->fbdev
)
684 unregister_framebuffer(fb_helper
->fbdev
);
686 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi
);
689 * drm_fb_helper_release_fbi - dealloc fb_info and its members
690 * @fb_helper: driver-allocated fbdev helper
692 * A helper to free memory taken by fb_info and the members cmap and
695 void drm_fb_helper_release_fbi(struct drm_fb_helper
*fb_helper
)
698 struct fb_info
*info
= fb_helper
->fbdev
;
702 fb_dealloc_cmap(&info
->cmap
);
703 framebuffer_release(info
);
706 fb_helper
->fbdev
= NULL
;
709 EXPORT_SYMBOL(drm_fb_helper_release_fbi
);
711 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
713 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
714 list_del(&fb_helper
->kernel_fb_list
);
715 if (list_empty(&kernel_fb_helper_list
)) {
716 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
720 drm_fb_helper_crtc_free(fb_helper
);
723 EXPORT_SYMBOL(drm_fb_helper_fini
);
726 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
727 * @fb_helper: driver-allocated fbdev helper
729 * A wrapper around unlink_framebuffer implemented by fbdev core
731 void drm_fb_helper_unlink_fbi(struct drm_fb_helper
*fb_helper
)
733 if (fb_helper
&& fb_helper
->fbdev
)
734 unlink_framebuffer(fb_helper
->fbdev
);
736 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi
);
739 * drm_fb_helper_sys_read - wrapper around fb_sys_read
740 * @info: fb_info struct pointer
741 * @buf: userspace buffer to read from framebuffer memory
742 * @count: number of bytes to read from framebuffer memory
743 * @ppos: read offset within framebuffer memory
745 * A wrapper around fb_sys_read implemented by fbdev core
747 ssize_t
drm_fb_helper_sys_read(struct fb_info
*info
, char __user
*buf
,
748 size_t count
, loff_t
*ppos
)
750 return fb_sys_read(info
, buf
, count
, ppos
);
752 EXPORT_SYMBOL(drm_fb_helper_sys_read
);
755 * drm_fb_helper_sys_write - wrapper around fb_sys_write
756 * @info: fb_info struct pointer
757 * @buf: userspace buffer to write to framebuffer memory
758 * @count: number of bytes to write to framebuffer memory
759 * @ppos: write offset within framebuffer memory
761 * A wrapper around fb_sys_write implemented by fbdev core
763 ssize_t
drm_fb_helper_sys_write(struct fb_info
*info
, const char __user
*buf
,
764 size_t count
, loff_t
*ppos
)
766 return fb_sys_write(info
, buf
, count
, ppos
);
768 EXPORT_SYMBOL(drm_fb_helper_sys_write
);
771 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
772 * @info: fbdev registered by the helper
773 * @rect: info about rectangle to fill
775 * A wrapper around sys_fillrect implemented by fbdev core
777 void drm_fb_helper_sys_fillrect(struct fb_info
*info
,
778 const struct fb_fillrect
*rect
)
780 sys_fillrect(info
, rect
);
782 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect
);
785 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
786 * @info: fbdev registered by the helper
787 * @area: info about area to copy
789 * A wrapper around sys_copyarea implemented by fbdev core
791 void drm_fb_helper_sys_copyarea(struct fb_info
*info
,
792 const struct fb_copyarea
*area
)
794 sys_copyarea(info
, area
);
796 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea
);
799 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
800 * @info: fbdev registered by the helper
801 * @image: info about image to blit
803 * A wrapper around sys_imageblit implemented by fbdev core
805 void drm_fb_helper_sys_imageblit(struct fb_info
*info
,
806 const struct fb_image
*image
)
808 sys_imageblit(info
, image
);
810 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit
);
813 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
814 * @info: fbdev registered by the helper
815 * @rect: info about rectangle to fill
817 * A wrapper around cfb_imageblit implemented by fbdev core
819 void drm_fb_helper_cfb_fillrect(struct fb_info
*info
,
820 const struct fb_fillrect
*rect
)
822 cfb_fillrect(info
, rect
);
824 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect
);
827 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
828 * @info: fbdev registered by the helper
829 * @area: info about area to copy
831 * A wrapper around cfb_copyarea implemented by fbdev core
833 void drm_fb_helper_cfb_copyarea(struct fb_info
*info
,
834 const struct fb_copyarea
*area
)
836 cfb_copyarea(info
, area
);
838 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea
);
841 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
842 * @info: fbdev registered by the helper
843 * @image: info about image to blit
845 * A wrapper around cfb_imageblit implemented by fbdev core
847 void drm_fb_helper_cfb_imageblit(struct fb_info
*info
,
848 const struct fb_image
*image
)
850 cfb_imageblit(info
, image
);
852 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit
);
855 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
856 * @fb_helper: driver-allocated fbdev helper
857 * @state: desired state, zero to resume, non-zero to suspend
859 * A wrapper around fb_set_suspend implemented by fbdev core
861 void drm_fb_helper_set_suspend(struct drm_fb_helper
*fb_helper
, int state
)
863 if (fb_helper
&& fb_helper
->fbdev
)
864 fb_set_suspend(fb_helper
->fbdev
, state
);
866 EXPORT_SYMBOL(drm_fb_helper_set_suspend
);
868 static int setcolreg(struct drm_crtc
*crtc
, u16 red
, u16 green
,
869 u16 blue
, u16 regno
, struct fb_info
*info
)
871 struct drm_fb_helper
*fb_helper
= info
->par
;
872 struct drm_framebuffer
*fb
= fb_helper
->fb
;
875 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
) {
878 /* place color in psuedopalette */
881 palette
= (u32
*)info
->pseudo_palette
;
882 red
>>= (16 - info
->var
.red
.length
);
883 green
>>= (16 - info
->var
.green
.length
);
884 blue
>>= (16 - info
->var
.blue
.length
);
885 value
= (red
<< info
->var
.red
.offset
) |
886 (green
<< info
->var
.green
.offset
) |
887 (blue
<< info
->var
.blue
.offset
);
888 if (info
->var
.transp
.length
> 0) {
889 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
890 mask
<<= info
->var
.transp
.offset
;
893 palette
[regno
] = value
;
898 * The driver really shouldn't advertise pseudo/directcolor
899 * visuals if it can't deal with the palette.
901 if (WARN_ON(!fb_helper
->funcs
->gamma_set
||
902 !fb_helper
->funcs
->gamma_get
))
907 if (fb
->bits_per_pixel
== 16) {
910 if (fb
->depth
== 16 && regno
> 63)
912 if (fb
->depth
== 15 && regno
> 31)
915 if (fb
->depth
== 16) {
919 for (i
= 0; i
< 8; i
++)
920 fb_helper
->funcs
->gamma_set(crtc
, red
,
921 green
, blue
, pindex
+ i
);
924 fb_helper
->funcs
->gamma_get(crtc
, &r
,
928 for (i
= 0; i
< 4; i
++)
929 fb_helper
->funcs
->gamma_set(crtc
, r
,
936 fb_helper
->funcs
->gamma_set(crtc
, red
, green
, blue
, pindex
);
941 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
943 * @info: fbdev registered by the helper
945 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
947 struct drm_fb_helper
*fb_helper
= info
->par
;
948 struct drm_device
*dev
= fb_helper
->dev
;
949 const struct drm_crtc_helper_funcs
*crtc_funcs
;
950 u16
*red
, *green
, *blue
, *transp
;
951 struct drm_crtc
*crtc
;
955 if (oops_in_progress
)
958 drm_modeset_lock_all(dev
);
959 if (!drm_fb_helper_is_bound(fb_helper
)) {
960 drm_modeset_unlock_all(dev
);
964 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
965 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
966 crtc_funcs
= crtc
->helper_private
;
971 transp
= cmap
->transp
;
974 for (j
= 0; j
< cmap
->len
; j
++) {
975 u16 hred
, hgreen
, hblue
, htransp
= 0xffff;
984 rc
= setcolreg(crtc
, hred
, hgreen
, hblue
, start
++, info
);
988 if (crtc_funcs
->load_lut
)
989 crtc_funcs
->load_lut(crtc
);
992 drm_modeset_unlock_all(dev
);
995 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
998 * drm_fb_helper_check_var - implementation for ->fb_check_var
999 * @var: screeninfo to check
1000 * @info: fbdev registered by the helper
1002 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
1003 struct fb_info
*info
)
1005 struct drm_fb_helper
*fb_helper
= info
->par
;
1006 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1009 if (var
->pixclock
!= 0 || in_dbg_master())
1012 /* Need to resize the fb object !!! */
1013 if (var
->bits_per_pixel
> fb
->bits_per_pixel
||
1014 var
->xres
> fb
->width
|| var
->yres
> fb
->height
||
1015 var
->xres_virtual
> fb
->width
|| var
->yres_virtual
> fb
->height
) {
1016 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1017 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1018 var
->xres
, var
->yres
, var
->bits_per_pixel
,
1019 var
->xres_virtual
, var
->yres_virtual
,
1020 fb
->width
, fb
->height
, fb
->bits_per_pixel
);
1024 switch (var
->bits_per_pixel
) {
1026 depth
= (var
->green
.length
== 6) ? 16 : 15;
1029 depth
= (var
->transp
.length
> 0) ? 32 : 24;
1032 depth
= var
->bits_per_pixel
;
1038 var
->red
.offset
= 0;
1039 var
->green
.offset
= 0;
1040 var
->blue
.offset
= 0;
1041 var
->red
.length
= 8;
1042 var
->green
.length
= 8;
1043 var
->blue
.length
= 8;
1044 var
->transp
.length
= 0;
1045 var
->transp
.offset
= 0;
1048 var
->red
.offset
= 10;
1049 var
->green
.offset
= 5;
1050 var
->blue
.offset
= 0;
1051 var
->red
.length
= 5;
1052 var
->green
.length
= 5;
1053 var
->blue
.length
= 5;
1054 var
->transp
.length
= 1;
1055 var
->transp
.offset
= 15;
1058 var
->red
.offset
= 11;
1059 var
->green
.offset
= 5;
1060 var
->blue
.offset
= 0;
1061 var
->red
.length
= 5;
1062 var
->green
.length
= 6;
1063 var
->blue
.length
= 5;
1064 var
->transp
.length
= 0;
1065 var
->transp
.offset
= 0;
1068 var
->red
.offset
= 16;
1069 var
->green
.offset
= 8;
1070 var
->blue
.offset
= 0;
1071 var
->red
.length
= 8;
1072 var
->green
.length
= 8;
1073 var
->blue
.length
= 8;
1074 var
->transp
.length
= 0;
1075 var
->transp
.offset
= 0;
1078 var
->red
.offset
= 16;
1079 var
->green
.offset
= 8;
1080 var
->blue
.offset
= 0;
1081 var
->red
.length
= 8;
1082 var
->green
.length
= 8;
1083 var
->blue
.length
= 8;
1084 var
->transp
.length
= 8;
1085 var
->transp
.offset
= 24;
1092 EXPORT_SYMBOL(drm_fb_helper_check_var
);
1095 * drm_fb_helper_set_par - implementation for ->fb_set_par
1096 * @info: fbdev registered by the helper
1098 * This will let fbcon do the mode init and is called at initialization time by
1099 * the fbdev core when registering the driver, and later on through the hotplug
1102 int drm_fb_helper_set_par(struct fb_info
*info
)
1104 struct drm_fb_helper
*fb_helper
= info
->par
;
1105 struct fb_var_screeninfo
*var
= &info
->var
;
1107 if (oops_in_progress
)
1110 if (var
->pixclock
!= 0) {
1111 DRM_ERROR("PIXEL CLOCK SET\n");
1115 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper
);
1119 EXPORT_SYMBOL(drm_fb_helper_set_par
);
1122 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1123 * @var: updated screen information
1124 * @info: fbdev registered by the helper
1126 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
1127 struct fb_info
*info
)
1129 struct drm_fb_helper
*fb_helper
= info
->par
;
1130 struct drm_device
*dev
= fb_helper
->dev
;
1131 struct drm_mode_set
*modeset
;
1135 if (oops_in_progress
)
1138 drm_modeset_lock_all(dev
);
1139 if (!drm_fb_helper_is_bound(fb_helper
)) {
1140 drm_modeset_unlock_all(dev
);
1144 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1145 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1147 modeset
->x
= var
->xoffset
;
1148 modeset
->y
= var
->yoffset
;
1150 if (modeset
->num_connectors
) {
1151 ret
= drm_mode_set_config_internal(modeset
);
1153 info
->var
.xoffset
= var
->xoffset
;
1154 info
->var
.yoffset
= var
->yoffset
;
1158 drm_modeset_unlock_all(dev
);
1161 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
1164 * Allocates the backing storage and sets up the fbdev info structure through
1165 * the ->fb_probe callback and then registers the fbdev and sets up the panic
1168 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
1174 struct fb_info
*info
;
1175 struct drm_fb_helper_surface_size sizes
;
1178 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
1179 sizes
.surface_depth
= 24;
1180 sizes
.surface_bpp
= 32;
1181 sizes
.fb_width
= (unsigned)-1;
1182 sizes
.fb_height
= (unsigned)-1;
1184 /* if driver picks 8 or 16 by default use that
1185 for both depth/bpp */
1186 if (preferred_bpp
!= sizes
.surface_bpp
)
1187 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
1189 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1190 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1191 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
1192 struct drm_cmdline_mode
*cmdline_mode
;
1194 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
1196 if (cmdline_mode
->bpp_specified
) {
1197 switch (cmdline_mode
->bpp
) {
1199 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
1202 sizes
.surface_depth
= 15;
1203 sizes
.surface_bpp
= 16;
1206 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
1209 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
1212 sizes
.surface_depth
= 24;
1213 sizes
.surface_bpp
= 32;
1221 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1222 struct drm_display_mode
*desired_mode
;
1223 struct drm_mode_set
*mode_set
;
1225 /* in case of tile group, are we the last tile vert or horiz?
1226 * If no tile group you are always the last one both vertically
1229 bool lastv
= true, lasth
= true;
1231 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
1232 mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
1239 x
= fb_helper
->crtc_info
[i
].x
;
1240 y
= fb_helper
->crtc_info
[i
].y
;
1242 if (gamma_size
== 0)
1243 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
1245 sizes
.surface_width
= max_t(u32
, desired_mode
->hdisplay
+ x
, sizes
.surface_width
);
1246 sizes
.surface_height
= max_t(u32
, desired_mode
->vdisplay
+ y
, sizes
.surface_height
);
1248 for (j
= 0; j
< mode_set
->num_connectors
; j
++) {
1249 struct drm_connector
*connector
= mode_set
->connectors
[j
];
1250 if (connector
->has_tile
) {
1251 lasth
= (connector
->tile_h_loc
== (connector
->num_h_tile
- 1));
1252 lastv
= (connector
->tile_v_loc
== (connector
->num_v_tile
- 1));
1253 /* cloning to multiple tiles is just crazy-talk, so: */
1259 sizes
.fb_width
= min_t(u32
, desired_mode
->hdisplay
+ x
, sizes
.fb_width
);
1261 sizes
.fb_height
= min_t(u32
, desired_mode
->vdisplay
+ y
, sizes
.fb_height
);
1264 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
1265 /* hmm everyone went away - assume VGA cable just fell out
1266 and will come back later. */
1267 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1268 sizes
.fb_width
= sizes
.surface_width
= 1024;
1269 sizes
.fb_height
= sizes
.surface_height
= 768;
1272 /* push down into drivers */
1273 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
1277 info
= fb_helper
->fbdev
;
1280 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1281 * events, but at init time drm_setup_crtcs needs to be called before
1282 * the fb is allocated (since we need to figure out the desired size of
1283 * the fb before we can allocate it ...). Hence we need to fix things up
1286 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
1287 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
1288 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
1291 info
->var
.pixclock
= 0;
1292 if (register_framebuffer(info
) < 0)
1295 dev_info(fb_helper
->dev
->dev
, "fb%d: %s frame buffer device\n",
1296 info
->node
, info
->fix
.id
);
1298 if (list_empty(&kernel_fb_helper_list
)) {
1299 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
1302 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
1308 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1309 * @info: fbdev registered by the helper
1310 * @pitch: desired pitch
1311 * @depth: desired depth
1313 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1314 * fbdev emulations. Drivers which support acceleration methods which impose
1315 * additional constraints need to set up their own limits.
1317 * Drivers should call this (or their equivalent setup code) from their
1318 * ->fb_probe callback.
1320 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1323 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1324 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1325 FB_VISUAL_TRUECOLOR
;
1326 info
->fix
.mmio_start
= 0;
1327 info
->fix
.mmio_len
= 0;
1328 info
->fix
.type_aux
= 0;
1329 info
->fix
.xpanstep
= 1; /* doing it in hw */
1330 info
->fix
.ypanstep
= 1; /* doing it in hw */
1331 info
->fix
.ywrapstep
= 0;
1332 info
->fix
.accel
= FB_ACCEL_NONE
;
1334 info
->fix
.line_length
= pitch
;
1337 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1340 * drm_fb_helper_fill_var - initalizes variable fbdev information
1341 * @info: fbdev instance to set up
1342 * @fb_helper: fb helper instance to use as template
1343 * @fb_width: desired fb width
1344 * @fb_height: desired fb height
1346 * Sets up the variable fbdev metainformation from the given fb helper instance
1347 * and the drm framebuffer allocated in fb_helper->fb.
1349 * Drivers should call this (or their equivalent setup code) from their
1350 * ->fb_probe callback after having allocated the fbdev backing
1351 * storage framebuffer.
1353 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1354 uint32_t fb_width
, uint32_t fb_height
)
1356 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1357 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1358 info
->var
.xres_virtual
= fb
->width
;
1359 info
->var
.yres_virtual
= fb
->height
;
1360 info
->var
.bits_per_pixel
= fb
->bits_per_pixel
;
1361 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1362 info
->var
.xoffset
= 0;
1363 info
->var
.yoffset
= 0;
1364 info
->var
.activate
= FB_ACTIVATE_NOW
;
1365 info
->var
.height
= -1;
1366 info
->var
.width
= -1;
1368 switch (fb
->depth
) {
1370 info
->var
.red
.offset
= 0;
1371 info
->var
.green
.offset
= 0;
1372 info
->var
.blue
.offset
= 0;
1373 info
->var
.red
.length
= 8; /* 8bit DAC */
1374 info
->var
.green
.length
= 8;
1375 info
->var
.blue
.length
= 8;
1376 info
->var
.transp
.offset
= 0;
1377 info
->var
.transp
.length
= 0;
1380 info
->var
.red
.offset
= 10;
1381 info
->var
.green
.offset
= 5;
1382 info
->var
.blue
.offset
= 0;
1383 info
->var
.red
.length
= 5;
1384 info
->var
.green
.length
= 5;
1385 info
->var
.blue
.length
= 5;
1386 info
->var
.transp
.offset
= 15;
1387 info
->var
.transp
.length
= 1;
1390 info
->var
.red
.offset
= 11;
1391 info
->var
.green
.offset
= 5;
1392 info
->var
.blue
.offset
= 0;
1393 info
->var
.red
.length
= 5;
1394 info
->var
.green
.length
= 6;
1395 info
->var
.blue
.length
= 5;
1396 info
->var
.transp
.offset
= 0;
1399 info
->var
.red
.offset
= 16;
1400 info
->var
.green
.offset
= 8;
1401 info
->var
.blue
.offset
= 0;
1402 info
->var
.red
.length
= 8;
1403 info
->var
.green
.length
= 8;
1404 info
->var
.blue
.length
= 8;
1405 info
->var
.transp
.offset
= 0;
1406 info
->var
.transp
.length
= 0;
1409 info
->var
.red
.offset
= 16;
1410 info
->var
.green
.offset
= 8;
1411 info
->var
.blue
.offset
= 0;
1412 info
->var
.red
.length
= 8;
1413 info
->var
.green
.length
= 8;
1414 info
->var
.blue
.length
= 8;
1415 info
->var
.transp
.offset
= 24;
1416 info
->var
.transp
.length
= 8;
1422 info
->var
.xres
= fb_width
;
1423 info
->var
.yres
= fb_height
;
1425 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1427 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1431 struct drm_connector
*connector
;
1435 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1436 connector
= fb_helper
->connector_info
[i
]->connector
;
1437 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1443 struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1445 struct drm_display_mode
*mode
;
1447 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1448 if (mode
->hdisplay
> width
||
1449 mode
->vdisplay
> height
)
1451 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1456 EXPORT_SYMBOL(drm_has_preferred_mode
);
1458 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1460 return fb_connector
->connector
->cmdline_mode
.specified
;
1463 struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
,
1464 int width
, int height
)
1466 struct drm_cmdline_mode
*cmdline_mode
;
1467 struct drm_display_mode
*mode
;
1468 bool prefer_non_interlace
;
1470 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
1471 if (cmdline_mode
->specified
== false)
1474 /* attempt to find a matching mode in the list of modes
1475 * we have gotten so far, if not add a CVT mode that conforms
1477 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1480 prefer_non_interlace
= !cmdline_mode
->interlace
;
1482 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1483 /* check width/height */
1484 if (mode
->hdisplay
!= cmdline_mode
->xres
||
1485 mode
->vdisplay
!= cmdline_mode
->yres
)
1488 if (cmdline_mode
->refresh_specified
) {
1489 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
1493 if (cmdline_mode
->interlace
) {
1494 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
1496 } else if (prefer_non_interlace
) {
1497 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
1503 if (prefer_non_interlace
) {
1504 prefer_non_interlace
= false;
1509 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
1511 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
1514 EXPORT_SYMBOL(drm_pick_cmdline_mode
);
1516 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
1521 enable
= connector
->status
== connector_status_connected
;
1523 enable
= connector
->status
!= connector_status_disconnected
;
1528 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
1531 bool any_enabled
= false;
1532 struct drm_connector
*connector
;
1535 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1536 connector
= fb_helper
->connector_info
[i
]->connector
;
1537 enabled
[i
] = drm_connector_enabled(connector
, true);
1538 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
1539 enabled
[i
] ? "yes" : "no");
1540 any_enabled
|= enabled
[i
];
1546 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1547 connector
= fb_helper
->connector_info
[i
]->connector
;
1548 enabled
[i
] = drm_connector_enabled(connector
, false);
1552 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
1553 struct drm_display_mode
**modes
,
1554 struct drm_fb_offset
*offsets
,
1555 bool *enabled
, int width
, int height
)
1558 bool can_clone
= false;
1559 struct drm_fb_helper_connector
*fb_helper_conn
;
1560 struct drm_display_mode
*dmt_mode
, *mode
;
1562 /* only contemplate cloning in the single crtc case */
1563 if (fb_helper
->crtc_count
> 1)
1567 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1572 /* only contemplate cloning if more than one connector is enabled */
1576 /* check the command line or if nothing common pick 1024x768 */
1578 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1581 fb_helper_conn
= fb_helper
->connector_info
[i
];
1582 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1587 for (j
= 0; j
< i
; j
++) {
1590 if (!drm_mode_equal(modes
[j
], modes
[i
]))
1596 DRM_DEBUG_KMS("can clone using command line\n");
1600 /* try and find a 1024x768 mode on each connector */
1602 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
1604 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1609 fb_helper_conn
= fb_helper
->connector_info
[i
];
1610 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1611 if (drm_mode_equal(mode
, dmt_mode
))
1619 DRM_DEBUG_KMS("can clone using 1024x768\n");
1622 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1626 static int drm_get_tile_offsets(struct drm_fb_helper
*fb_helper
,
1627 struct drm_display_mode
**modes
,
1628 struct drm_fb_offset
*offsets
,
1630 int h_idx
, int v_idx
)
1632 struct drm_fb_helper_connector
*fb_helper_conn
;
1634 int hoffset
= 0, voffset
= 0;
1636 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1637 fb_helper_conn
= fb_helper
->connector_info
[i
];
1638 if (!fb_helper_conn
->connector
->has_tile
)
1641 if (!modes
[i
] && (h_idx
|| v_idx
)) {
1642 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i
,
1643 fb_helper_conn
->connector
->base
.id
);
1646 if (fb_helper_conn
->connector
->tile_h_loc
< h_idx
)
1647 hoffset
+= modes
[i
]->hdisplay
;
1649 if (fb_helper_conn
->connector
->tile_v_loc
< v_idx
)
1650 voffset
+= modes
[i
]->vdisplay
;
1652 offsets
[idx
].x
= hoffset
;
1653 offsets
[idx
].y
= voffset
;
1654 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset
, voffset
, h_idx
, v_idx
);
1658 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
1659 struct drm_display_mode
**modes
,
1660 struct drm_fb_offset
*offsets
,
1661 bool *enabled
, int width
, int height
)
1663 struct drm_fb_helper_connector
*fb_helper_conn
;
1665 uint64_t conn_configured
= 0, mask
;
1667 mask
= (1 << fb_helper
->connector_count
) - 1;
1669 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1670 fb_helper_conn
= fb_helper
->connector_info
[i
];
1672 if (conn_configured
& (1 << i
))
1675 if (enabled
[i
] == false) {
1676 conn_configured
|= (1 << i
);
1680 /* first pass over all the untiled connectors */
1681 if (tile_pass
== 0 && fb_helper_conn
->connector
->has_tile
)
1684 if (tile_pass
== 1) {
1685 if (fb_helper_conn
->connector
->tile_h_loc
!= 0 ||
1686 fb_helper_conn
->connector
->tile_v_loc
!= 0)
1690 if (fb_helper_conn
->connector
->tile_h_loc
!= tile_pass
-1 &&
1691 fb_helper_conn
->connector
->tile_v_loc
!= tile_pass
- 1)
1692 /* if this tile_pass doesn't cover any of the tiles - keep going */
1695 /* find the tile offsets for this pass - need
1696 to find all tiles left and above */
1697 drm_get_tile_offsets(fb_helper
, modes
, offsets
,
1698 i
, fb_helper_conn
->connector
->tile_h_loc
, fb_helper_conn
->connector
->tile_v_loc
);
1700 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1701 fb_helper_conn
->connector
->base
.id
);
1703 /* got for command line mode first */
1704 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1706 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1707 fb_helper_conn
->connector
->base
.id
, fb_helper_conn
->connector
->tile_group
? fb_helper_conn
->connector
->tile_group
->id
: 0);
1708 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
1710 /* No preferred modes, pick one off the list */
1711 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
1712 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
1715 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
1717 conn_configured
|= (1 << i
);
1720 if ((conn_configured
& mask
) != mask
) {
1727 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
1728 struct drm_fb_helper_crtc
**best_crtcs
,
1729 struct drm_display_mode
**modes
,
1730 int n
, int width
, int height
)
1733 struct drm_device
*dev
= fb_helper
->dev
;
1734 struct drm_connector
*connector
;
1735 const struct drm_connector_helper_funcs
*connector_funcs
;
1736 struct drm_encoder
*encoder
;
1737 int my_score
, best_score
, score
;
1738 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
1739 struct drm_fb_helper_connector
*fb_helper_conn
;
1741 if (n
== fb_helper
->connector_count
)
1744 fb_helper_conn
= fb_helper
->connector_info
[n
];
1745 connector
= fb_helper_conn
->connector
;
1747 best_crtcs
[n
] = NULL
;
1748 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
1749 if (modes
[n
] == NULL
)
1752 crtcs
= kzalloc(dev
->mode_config
.num_connector
*
1753 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1758 if (connector
->status
== connector_status_connected
)
1760 if (drm_has_cmdline_mode(fb_helper_conn
))
1762 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
1765 connector_funcs
= connector
->helper_private
;
1766 encoder
= connector_funcs
->best_encoder(connector
);
1770 /* select a crtc for this connector and then attempt to configure
1771 remaining connectors */
1772 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
1773 crtc
= &fb_helper
->crtc_info
[c
];
1775 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
1778 for (o
= 0; o
< n
; o
++)
1779 if (best_crtcs
[o
] == crtc
)
1783 /* ignore cloning unless only a single crtc */
1784 if (fb_helper
->crtc_count
> 1)
1787 if (!drm_mode_equal(modes
[o
], modes
[n
]))
1792 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
1793 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
1795 if (score
> best_score
) {
1797 memcpy(best_crtcs
, crtcs
,
1798 dev
->mode_config
.num_connector
*
1799 sizeof(struct drm_fb_helper_crtc
*));
1807 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
)
1809 struct drm_device
*dev
= fb_helper
->dev
;
1810 struct drm_fb_helper_crtc
**crtcs
;
1811 struct drm_display_mode
**modes
;
1812 struct drm_fb_offset
*offsets
;
1813 struct drm_mode_set
*modeset
;
1818 DRM_DEBUG_KMS("\n");
1820 width
= dev
->mode_config
.max_width
;
1821 height
= dev
->mode_config
.max_height
;
1823 crtcs
= kcalloc(dev
->mode_config
.num_connector
,
1824 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1825 modes
= kcalloc(dev
->mode_config
.num_connector
,
1826 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
1827 offsets
= kcalloc(dev
->mode_config
.num_connector
,
1828 sizeof(struct drm_fb_offset
), GFP_KERNEL
);
1829 enabled
= kcalloc(dev
->mode_config
.num_connector
,
1830 sizeof(bool), GFP_KERNEL
);
1831 if (!crtcs
|| !modes
|| !enabled
|| !offsets
) {
1832 DRM_ERROR("Memory allocation failed\n");
1837 drm_enable_connectors(fb_helper
, enabled
);
1839 if (!(fb_helper
->funcs
->initial_config
&&
1840 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
1842 enabled
, width
, height
))) {
1843 memset(modes
, 0, dev
->mode_config
.num_connector
*sizeof(modes
[0]));
1844 memset(crtcs
, 0, dev
->mode_config
.num_connector
*sizeof(crtcs
[0]));
1845 memset(offsets
, 0, dev
->mode_config
.num_connector
*sizeof(offsets
[0]));
1847 if (!drm_target_cloned(fb_helper
, modes
, offsets
,
1848 enabled
, width
, height
) &&
1849 !drm_target_preferred(fb_helper
, modes
, offsets
,
1850 enabled
, width
, height
))
1851 DRM_ERROR("Unable to find initial modes\n");
1853 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1856 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
1859 /* need to set the modesets up here for use later */
1860 /* fill out the connector<->crtc mappings into the modesets */
1861 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1862 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1863 modeset
->num_connectors
= 0;
1867 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1868 struct drm_display_mode
*mode
= modes
[i
];
1869 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
1870 struct drm_fb_offset
*offset
= &offsets
[i
];
1871 modeset
= &fb_crtc
->mode_set
;
1873 if (mode
&& fb_crtc
) {
1874 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
1875 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
, offset
->x
, offset
->y
);
1876 fb_crtc
->desired_mode
= mode
;
1877 fb_crtc
->x
= offset
->x
;
1878 fb_crtc
->y
= offset
->y
;
1880 drm_mode_destroy(dev
, modeset
->mode
);
1881 modeset
->mode
= drm_mode_duplicate(dev
,
1882 fb_crtc
->desired_mode
);
1883 modeset
->connectors
[modeset
->num_connectors
++] = fb_helper
->connector_info
[i
]->connector
;
1884 modeset
->fb
= fb_helper
->fb
;
1885 modeset
->x
= offset
->x
;
1886 modeset
->y
= offset
->y
;
1890 /* Clear out any old modes if there are no more connected outputs. */
1891 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1892 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1893 if (modeset
->num_connectors
== 0) {
1894 BUG_ON(modeset
->fb
);
1896 drm_mode_destroy(dev
, modeset
->mode
);
1897 modeset
->mode
= NULL
;
1908 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1909 * @fb_helper: fb_helper device struct
1910 * @bpp_sel: bpp value to use for the framebuffer configuration
1912 * Scans the CRTCs and connectors and tries to put together an initial setup.
1913 * At the moment, this is a cloned configuration across all heads with
1914 * a new framebuffer object as the backing store.
1916 * Note that this also registers the fbdev and so allows userspace to call into
1917 * the driver through the fbdev interfaces.
1919 * This function will call down into the ->fb_probe callback to let
1920 * the driver allocate and initialize the fbdev info structure and the drm
1921 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1922 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1923 * values for the fbdev info structure.
1926 * Zero if everything went ok, nonzero otherwise.
1928 int drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
1930 struct drm_device
*dev
= fb_helper
->dev
;
1933 mutex_lock(&dev
->mode_config
.mutex
);
1934 count
= drm_fb_helper_probe_connector_modes(fb_helper
,
1935 dev
->mode_config
.max_width
,
1936 dev
->mode_config
.max_height
);
1937 mutex_unlock(&dev
->mode_config
.mutex
);
1939 * we shouldn't end up with no modes here.
1942 dev_info(fb_helper
->dev
->dev
, "No connectors reported connected with modes\n");
1944 drm_setup_crtcs(fb_helper
);
1946 return drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
1948 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
1951 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1952 * probing all the outputs attached to the fb
1953 * @fb_helper: the drm_fb_helper
1955 * Scan the connectors attached to the fb_helper and try to put together a
1956 * setup after *notification of a change in output configuration.
1958 * Called at runtime, takes the mode config locks to be able to check/change the
1959 * modeset configuration. Must be run from process context (which usually means
1960 * either the output polling work or a work item launched from the driver's
1961 * hotplug interrupt).
1963 * Note that drivers may call this even before calling
1964 * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1965 * for a race-free fbcon setup and will make sure that the fbdev emulation will
1966 * not miss any hotplug events.
1969 * 0 on success and a non-zero error code otherwise.
1971 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
1973 struct drm_device
*dev
= fb_helper
->dev
;
1974 u32 max_width
, max_height
;
1976 mutex_lock(&fb_helper
->dev
->mode_config
.mutex
);
1977 if (!fb_helper
->fb
|| !drm_fb_helper_is_bound(fb_helper
)) {
1978 fb_helper
->delayed_hotplug
= true;
1979 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1982 DRM_DEBUG_KMS("\n");
1984 max_width
= fb_helper
->fb
->width
;
1985 max_height
= fb_helper
->fb
->height
;
1987 drm_fb_helper_probe_connector_modes(fb_helper
, max_width
, max_height
);
1988 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1990 drm_modeset_lock_all(dev
);
1991 drm_setup_crtcs(fb_helper
);
1992 drm_modeset_unlock_all(dev
);
1993 drm_fb_helper_set_par(fb_helper
->fbdev
);
1997 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
1999 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2000 * but the module doesn't depend on any fb console symbols. At least
2001 * attempt to load fbcon to avoid leaving the system without a usable console.
2003 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2004 static int __init
drm_fb_helper_modinit(void)
2006 const char *name
= "fbcon";
2007 struct module
*fbcon
;
2009 mutex_lock(&module_mutex
);
2010 fbcon
= find_module(name
);
2011 mutex_unlock(&module_mutex
);
2014 request_module_nowait(name
);
2018 module_init(drm_fb_helper_modinit
);