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() from their ->lastclose callback. They
60 * 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 * Since this is part of the initial setup before the fbdev is published, no
93 * locking is required.
95 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper
*fb_helper
)
97 struct drm_device
*dev
= fb_helper
->dev
;
98 struct drm_connector
*connector
;
101 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
102 struct drm_fb_helper_connector
*fb_helper_connector
;
104 fb_helper_connector
= kzalloc(sizeof(struct drm_fb_helper_connector
), GFP_KERNEL
);
105 if (!fb_helper_connector
)
108 fb_helper_connector
->connector
= connector
;
109 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_helper_connector
;
113 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
114 kfree(fb_helper
->connector_info
[i
]);
115 fb_helper
->connector_info
[i
] = NULL
;
117 fb_helper
->connector_count
= 0;
120 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors
);
122 int drm_fb_helper_add_one_connector(struct drm_fb_helper
*fb_helper
, struct drm_connector
*connector
)
124 struct drm_fb_helper_connector
**temp
;
125 struct drm_fb_helper_connector
*fb_helper_connector
;
127 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
128 if (fb_helper
->connector_count
+ 1 > fb_helper
->connector_info_alloc_count
) {
129 temp
= krealloc(fb_helper
->connector_info
, sizeof(struct drm_fb_helper_connector
) * (fb_helper
->connector_count
+ 1), GFP_KERNEL
);
133 fb_helper
->connector_info_alloc_count
= fb_helper
->connector_count
+ 1;
134 fb_helper
->connector_info
= temp
;
138 fb_helper_connector
= kzalloc(sizeof(struct drm_fb_helper_connector
), GFP_KERNEL
);
139 if (!fb_helper_connector
)
142 fb_helper_connector
->connector
= connector
;
143 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_helper_connector
;
146 EXPORT_SYMBOL(drm_fb_helper_add_one_connector
);
148 int drm_fb_helper_remove_one_connector(struct drm_fb_helper
*fb_helper
,
149 struct drm_connector
*connector
)
151 struct drm_fb_helper_connector
*fb_helper_connector
;
154 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
156 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
157 if (fb_helper
->connector_info
[i
]->connector
== connector
)
161 if (i
== fb_helper
->connector_count
)
163 fb_helper_connector
= fb_helper
->connector_info
[i
];
165 for (j
= i
+ 1; j
< fb_helper
->connector_count
; j
++) {
166 fb_helper
->connector_info
[j
- 1] = fb_helper
->connector_info
[j
];
168 fb_helper
->connector_count
--;
169 kfree(fb_helper_connector
);
172 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector
);
174 static int drm_fb_helper_parse_command_line(struct drm_fb_helper
*fb_helper
)
176 struct drm_fb_helper_connector
*fb_helper_conn
;
179 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
180 struct drm_cmdline_mode
*mode
;
181 struct drm_connector
*connector
;
184 fb_helper_conn
= fb_helper
->connector_info
[i
];
185 connector
= fb_helper_conn
->connector
;
186 mode
= &fb_helper_conn
->cmdline_mode
;
188 /* do something on return - turn off connector maybe */
189 if (fb_get_options(connector
->name
, &option
))
192 if (drm_mode_parse_command_line_for_connector(option
,
197 switch (mode
->force
) {
201 case DRM_FORCE_ON_DIGITAL
:
210 DRM_INFO("forcing %s connector %s\n",
212 connector
->force
= mode
->force
;
215 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
217 mode
->xres
, mode
->yres
,
218 mode
->refresh_specified
? mode
->refresh
: 60,
219 mode
->rb
? " reduced blanking" : "",
220 mode
->margins
? " with margins" : "",
221 mode
->interlace
? " interlaced" : "");
228 static void drm_fb_helper_save_lut_atomic(struct drm_crtc
*crtc
, struct drm_fb_helper
*helper
)
230 uint16_t *r_base
, *g_base
, *b_base
;
233 if (helper
->funcs
->gamma_get
== NULL
)
236 r_base
= crtc
->gamma_store
;
237 g_base
= r_base
+ crtc
->gamma_size
;
238 b_base
= g_base
+ crtc
->gamma_size
;
240 for (i
= 0; i
< crtc
->gamma_size
; i
++)
241 helper
->funcs
->gamma_get(crtc
, &r_base
[i
], &g_base
[i
], &b_base
[i
], i
);
244 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc
*crtc
)
246 uint16_t *r_base
, *g_base
, *b_base
;
248 if (crtc
->funcs
->gamma_set
== NULL
)
251 r_base
= crtc
->gamma_store
;
252 g_base
= r_base
+ crtc
->gamma_size
;
253 b_base
= g_base
+ crtc
->gamma_size
;
255 crtc
->funcs
->gamma_set(crtc
, r_base
, g_base
, b_base
, 0, crtc
->gamma_size
);
259 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
260 * @info: fbdev registered by the helper
262 int drm_fb_helper_debug_enter(struct fb_info
*info
)
264 struct drm_fb_helper
*helper
= info
->par
;
265 struct drm_crtc_helper_funcs
*funcs
;
268 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
269 for (i
= 0; i
< helper
->crtc_count
; i
++) {
270 struct drm_mode_set
*mode_set
=
271 &helper
->crtc_info
[i
].mode_set
;
273 if (!mode_set
->crtc
->enabled
)
276 funcs
= mode_set
->crtc
->helper_private
;
277 drm_fb_helper_save_lut_atomic(mode_set
->crtc
, helper
);
278 funcs
->mode_set_base_atomic(mode_set
->crtc
,
282 ENTER_ATOMIC_MODE_SET
);
288 EXPORT_SYMBOL(drm_fb_helper_debug_enter
);
290 /* Find the real fb for a given fb helper CRTC */
291 static struct drm_framebuffer
*drm_mode_config_fb(struct drm_crtc
*crtc
)
293 struct drm_device
*dev
= crtc
->dev
;
296 list_for_each_entry(c
, &dev
->mode_config
.crtc_list
, head
) {
297 if (crtc
->base
.id
== c
->base
.id
)
298 return c
->primary
->fb
;
305 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
306 * @info: fbdev registered by the helper
308 int drm_fb_helper_debug_leave(struct fb_info
*info
)
310 struct drm_fb_helper
*helper
= info
->par
;
311 struct drm_crtc
*crtc
;
312 struct drm_crtc_helper_funcs
*funcs
;
313 struct drm_framebuffer
*fb
;
316 for (i
= 0; i
< helper
->crtc_count
; i
++) {
317 struct drm_mode_set
*mode_set
= &helper
->crtc_info
[i
].mode_set
;
318 crtc
= mode_set
->crtc
;
319 funcs
= crtc
->helper_private
;
320 fb
= drm_mode_config_fb(crtc
);
326 DRM_ERROR("no fb to restore??\n");
330 drm_fb_helper_restore_lut_atomic(mode_set
->crtc
);
331 funcs
->mode_set_base_atomic(mode_set
->crtc
, fb
, crtc
->x
,
332 crtc
->y
, LEAVE_ATOMIC_MODE_SET
);
337 EXPORT_SYMBOL(drm_fb_helper_debug_leave
);
339 static bool restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
341 struct drm_device
*dev
= fb_helper
->dev
;
342 struct drm_plane
*plane
;
346 drm_warn_on_modeset_not_all_locked(dev
);
348 list_for_each_entry(plane
, &dev
->mode_config
.plane_list
, head
)
349 if (plane
->type
!= DRM_PLANE_TYPE_PRIMARY
)
350 drm_plane_force_disable(plane
);
352 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
353 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
354 struct drm_crtc
*crtc
= mode_set
->crtc
;
357 if (crtc
->funcs
->cursor_set
) {
358 ret
= crtc
->funcs
->cursor_set(crtc
, NULL
, 0, 0, 0);
363 ret
= drm_mode_set_config_internal(mode_set
);
370 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
371 * @fb_helper: fbcon to restore
373 * This should be called from driver's drm ->lastclose callback
374 * when implementing an fbcon on top of kms using this helper. This ensures that
375 * the user isn't greeted with a black screen when e.g. X dies.
377 * Use this variant if you need to bypass locking (panic), or already
378 * hold all modeset locks. Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
380 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
382 return restore_fbdev_mode(fb_helper
);
386 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
387 * @fb_helper: fbcon to restore
389 * This should be called from driver's drm ->lastclose callback
390 * when implementing an fbcon on top of kms using this helper. This ensures that
391 * the user isn't greeted with a black screen when e.g. X dies.
393 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper
*fb_helper
)
395 struct drm_device
*dev
= fb_helper
->dev
;
397 drm_modeset_lock_all(dev
);
398 ret
= restore_fbdev_mode(fb_helper
);
399 drm_modeset_unlock_all(dev
);
402 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked
);
405 * restore fbcon display for all kms driver's using this helper, used for sysrq
406 * and panic handling.
408 static bool drm_fb_helper_force_kernel_mode(void)
410 bool ret
, error
= false;
411 struct drm_fb_helper
*helper
;
413 if (list_empty(&kernel_fb_helper_list
))
416 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
417 struct drm_device
*dev
= helper
->dev
;
419 if (dev
->switch_power_state
== DRM_SWITCH_POWER_OFF
)
422 /* NOTE: we use lockless flag below to avoid grabbing other
423 * modeset locks. So just trylock the underlying mutex
426 if (!mutex_trylock(&dev
->mode_config
.mutex
)) {
431 ret
= drm_fb_helper_restore_fbdev_mode(helper
);
435 mutex_unlock(&dev
->mode_config
.mutex
);
440 static int drm_fb_helper_panic(struct notifier_block
*n
, unsigned long ununsed
,
444 * It's a waste of time and effort to switch back to text console
445 * if the kernel should reboot before panic messages can be seen.
447 if (panic_timeout
< 0)
450 pr_err("panic occurred, switching back to text console\n");
451 return drm_fb_helper_force_kernel_mode();
454 static struct notifier_block paniced
= {
455 .notifier_call
= drm_fb_helper_panic
,
458 static bool drm_fb_helper_is_bound(struct drm_fb_helper
*fb_helper
)
460 struct drm_device
*dev
= fb_helper
->dev
;
461 struct drm_crtc
*crtc
;
462 int bound
= 0, crtcs_bound
= 0;
464 /* Sometimes user space wants everything disabled, so don't steal the
465 * display if there's a master. */
466 if (dev
->primary
->master
)
469 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
470 if (crtc
->primary
->fb
)
472 if (crtc
->primary
->fb
== fb_helper
->fb
)
476 if (bound
< crtcs_bound
)
482 #ifdef CONFIG_MAGIC_SYSRQ
483 static void drm_fb_helper_restore_work_fn(struct work_struct
*ignored
)
486 ret
= drm_fb_helper_force_kernel_mode();
488 DRM_ERROR("Failed to restore crtc configuration\n");
490 static DECLARE_WORK(drm_fb_helper_restore_work
, drm_fb_helper_restore_work_fn
);
492 static void drm_fb_helper_sysrq(int dummy1
)
494 schedule_work(&drm_fb_helper_restore_work
);
497 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
498 .handler
= drm_fb_helper_sysrq
,
499 .help_msg
= "force-fb(V)",
500 .action_msg
= "Restore framebuffer console",
503 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= { };
506 static void drm_fb_helper_dpms(struct fb_info
*info
, int dpms_mode
)
508 struct drm_fb_helper
*fb_helper
= info
->par
;
509 struct drm_device
*dev
= fb_helper
->dev
;
510 struct drm_crtc
*crtc
;
511 struct drm_connector
*connector
;
515 * fbdev->blank can be called from irq context in case of a panic.
516 * Since we already have our own special panic handler which will
517 * restore the fbdev console mode completely, just bail out early.
519 if (oops_in_progress
)
523 * For each CRTC in this fb, turn the connectors on/off.
525 drm_modeset_lock_all(dev
);
526 if (!drm_fb_helper_is_bound(fb_helper
)) {
527 drm_modeset_unlock_all(dev
);
531 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
532 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
537 /* Walk the connectors & encoders on this fb turning them on/off */
538 for (j
= 0; j
< fb_helper
->connector_count
; j
++) {
539 connector
= fb_helper
->connector_info
[j
]->connector
;
540 connector
->funcs
->dpms(connector
, dpms_mode
);
541 drm_object_property_set_value(&connector
->base
,
542 dev
->mode_config
.dpms_property
, dpms_mode
);
545 drm_modeset_unlock_all(dev
);
549 * drm_fb_helper_blank - implementation for ->fb_blank
550 * @blank: desired blanking state
551 * @info: fbdev registered by the helper
553 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
556 /* Display: On; HSync: On, VSync: On */
557 case FB_BLANK_UNBLANK
:
558 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
560 /* Display: Off; HSync: On, VSync: On */
561 case FB_BLANK_NORMAL
:
562 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
564 /* Display: Off; HSync: Off, VSync: On */
565 case FB_BLANK_HSYNC_SUSPEND
:
566 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
568 /* Display: Off; HSync: On, VSync: Off */
569 case FB_BLANK_VSYNC_SUSPEND
:
570 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
572 /* Display: Off; HSync: Off, VSync: Off */
573 case FB_BLANK_POWERDOWN
:
574 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
579 EXPORT_SYMBOL(drm_fb_helper_blank
);
581 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
585 for (i
= 0; i
< helper
->connector_count
; i
++)
586 kfree(helper
->connector_info
[i
]);
587 kfree(helper
->connector_info
);
588 for (i
= 0; i
< helper
->crtc_count
; i
++) {
589 kfree(helper
->crtc_info
[i
].mode_set
.connectors
);
590 if (helper
->crtc_info
[i
].mode_set
.mode
)
591 drm_mode_destroy(helper
->dev
, helper
->crtc_info
[i
].mode_set
.mode
);
593 kfree(helper
->crtc_info
);
597 * drm_fb_helper_prepare - setup a drm_fb_helper structure
599 * @helper: driver-allocated fbdev helper structure to set up
600 * @funcs: pointer to structure of functions associate with this helper
602 * Sets up the bare minimum to make the framebuffer helper usable. This is
603 * useful to implement race-free initialization of the polling helpers.
605 void drm_fb_helper_prepare(struct drm_device
*dev
, struct drm_fb_helper
*helper
,
606 const struct drm_fb_helper_funcs
*funcs
)
608 INIT_LIST_HEAD(&helper
->kernel_fb_list
);
609 helper
->funcs
= funcs
;
612 EXPORT_SYMBOL(drm_fb_helper_prepare
);
615 * drm_fb_helper_init - initialize a drm_fb_helper structure
617 * @fb_helper: driver-allocated fbdev helper structure to initialize
618 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
619 * @max_conn_count: max connector count
621 * This allocates the structures for the fbdev helper with the given limits.
622 * Note that this won't yet touch the hardware (through the driver interfaces)
623 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
624 * to allow driver writes more control over the exact init sequence.
626 * Drivers must call drm_fb_helper_prepare() before calling this function.
629 * Zero if everything went ok, nonzero otherwise.
631 int drm_fb_helper_init(struct drm_device
*dev
,
632 struct drm_fb_helper
*fb_helper
,
633 int crtc_count
, int max_conn_count
)
635 struct drm_crtc
*crtc
;
641 fb_helper
->crtc_info
= kcalloc(crtc_count
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
642 if (!fb_helper
->crtc_info
)
645 fb_helper
->crtc_count
= crtc_count
;
646 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
647 if (!fb_helper
->connector_info
) {
648 kfree(fb_helper
->crtc_info
);
651 fb_helper
->connector_info_alloc_count
= dev
->mode_config
.num_connector
;
652 fb_helper
->connector_count
= 0;
654 for (i
= 0; i
< crtc_count
; i
++) {
655 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
656 kcalloc(max_conn_count
,
657 sizeof(struct drm_connector
*),
660 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
662 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
666 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
667 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
673 drm_fb_helper_crtc_free(fb_helper
);
676 EXPORT_SYMBOL(drm_fb_helper_init
);
678 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
680 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
681 list_del(&fb_helper
->kernel_fb_list
);
682 if (list_empty(&kernel_fb_helper_list
)) {
683 pr_info("drm: unregistered panic notifier\n");
684 atomic_notifier_chain_unregister(&panic_notifier_list
,
686 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
690 drm_fb_helper_crtc_free(fb_helper
);
693 EXPORT_SYMBOL(drm_fb_helper_fini
);
695 static int setcolreg(struct drm_crtc
*crtc
, u16 red
, u16 green
,
696 u16 blue
, u16 regno
, struct fb_info
*info
)
698 struct drm_fb_helper
*fb_helper
= info
->par
;
699 struct drm_framebuffer
*fb
= fb_helper
->fb
;
702 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
) {
705 /* place color in psuedopalette */
708 palette
= (u32
*)info
->pseudo_palette
;
709 red
>>= (16 - info
->var
.red
.length
);
710 green
>>= (16 - info
->var
.green
.length
);
711 blue
>>= (16 - info
->var
.blue
.length
);
712 value
= (red
<< info
->var
.red
.offset
) |
713 (green
<< info
->var
.green
.offset
) |
714 (blue
<< info
->var
.blue
.offset
);
715 if (info
->var
.transp
.length
> 0) {
716 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
717 mask
<<= info
->var
.transp
.offset
;
720 palette
[regno
] = value
;
725 * The driver really shouldn't advertise pseudo/directcolor
726 * visuals if it can't deal with the palette.
728 if (WARN_ON(!fb_helper
->funcs
->gamma_set
||
729 !fb_helper
->funcs
->gamma_get
))
734 if (fb
->bits_per_pixel
== 16) {
737 if (fb
->depth
== 16 && regno
> 63)
739 if (fb
->depth
== 15 && regno
> 31)
742 if (fb
->depth
== 16) {
746 for (i
= 0; i
< 8; i
++)
747 fb_helper
->funcs
->gamma_set(crtc
, red
,
748 green
, blue
, pindex
+ i
);
751 fb_helper
->funcs
->gamma_get(crtc
, &r
,
755 for (i
= 0; i
< 4; i
++)
756 fb_helper
->funcs
->gamma_set(crtc
, r
,
763 fb_helper
->funcs
->gamma_set(crtc
, red
, green
, blue
, pindex
);
768 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
770 * @info: fbdev registered by the helper
772 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
774 struct drm_fb_helper
*fb_helper
= info
->par
;
775 struct drm_device
*dev
= fb_helper
->dev
;
776 struct drm_crtc_helper_funcs
*crtc_funcs
;
777 u16
*red
, *green
, *blue
, *transp
;
778 struct drm_crtc
*crtc
;
782 drm_modeset_lock_all(dev
);
783 if (!drm_fb_helper_is_bound(fb_helper
)) {
784 drm_modeset_unlock_all(dev
);
788 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
789 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
790 crtc_funcs
= crtc
->helper_private
;
795 transp
= cmap
->transp
;
798 for (j
= 0; j
< cmap
->len
; j
++) {
799 u16 hred
, hgreen
, hblue
, htransp
= 0xffff;
808 rc
= setcolreg(crtc
, hred
, hgreen
, hblue
, start
++, info
);
812 if (crtc_funcs
->load_lut
)
813 crtc_funcs
->load_lut(crtc
);
816 drm_modeset_unlock_all(dev
);
819 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
822 * drm_fb_helper_check_var - implementation for ->fb_check_var
823 * @var: screeninfo to check
824 * @info: fbdev registered by the helper
826 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
827 struct fb_info
*info
)
829 struct drm_fb_helper
*fb_helper
= info
->par
;
830 struct drm_framebuffer
*fb
= fb_helper
->fb
;
833 if (var
->pixclock
!= 0 || in_dbg_master())
836 /* Need to resize the fb object !!! */
837 if (var
->bits_per_pixel
> fb
->bits_per_pixel
||
838 var
->xres
> fb
->width
|| var
->yres
> fb
->height
||
839 var
->xres_virtual
> fb
->width
|| var
->yres_virtual
> fb
->height
) {
840 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
841 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
842 var
->xres
, var
->yres
, var
->bits_per_pixel
,
843 var
->xres_virtual
, var
->yres_virtual
,
844 fb
->width
, fb
->height
, fb
->bits_per_pixel
);
848 switch (var
->bits_per_pixel
) {
850 depth
= (var
->green
.length
== 6) ? 16 : 15;
853 depth
= (var
->transp
.length
> 0) ? 32 : 24;
856 depth
= var
->bits_per_pixel
;
863 var
->green
.offset
= 0;
864 var
->blue
.offset
= 0;
866 var
->green
.length
= 8;
867 var
->blue
.length
= 8;
868 var
->transp
.length
= 0;
869 var
->transp
.offset
= 0;
872 var
->red
.offset
= 10;
873 var
->green
.offset
= 5;
874 var
->blue
.offset
= 0;
876 var
->green
.length
= 5;
877 var
->blue
.length
= 5;
878 var
->transp
.length
= 1;
879 var
->transp
.offset
= 15;
882 var
->red
.offset
= 11;
883 var
->green
.offset
= 5;
884 var
->blue
.offset
= 0;
886 var
->green
.length
= 6;
887 var
->blue
.length
= 5;
888 var
->transp
.length
= 0;
889 var
->transp
.offset
= 0;
892 var
->red
.offset
= 16;
893 var
->green
.offset
= 8;
894 var
->blue
.offset
= 0;
896 var
->green
.length
= 8;
897 var
->blue
.length
= 8;
898 var
->transp
.length
= 0;
899 var
->transp
.offset
= 0;
902 var
->red
.offset
= 16;
903 var
->green
.offset
= 8;
904 var
->blue
.offset
= 0;
906 var
->green
.length
= 8;
907 var
->blue
.length
= 8;
908 var
->transp
.length
= 8;
909 var
->transp
.offset
= 24;
916 EXPORT_SYMBOL(drm_fb_helper_check_var
);
919 * drm_fb_helper_set_par - implementation for ->fb_set_par
920 * @info: fbdev registered by the helper
922 * This will let fbcon do the mode init and is called at initialization time by
923 * the fbdev core when registering the driver, and later on through the hotplug
926 int drm_fb_helper_set_par(struct fb_info
*info
)
928 struct drm_fb_helper
*fb_helper
= info
->par
;
929 struct fb_var_screeninfo
*var
= &info
->var
;
931 if (var
->pixclock
!= 0) {
932 DRM_ERROR("PIXEL CLOCK SET\n");
936 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper
);
938 if (fb_helper
->delayed_hotplug
) {
939 fb_helper
->delayed_hotplug
= false;
940 drm_fb_helper_hotplug_event(fb_helper
);
944 EXPORT_SYMBOL(drm_fb_helper_set_par
);
947 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
948 * @var: updated screen information
949 * @info: fbdev registered by the helper
951 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
952 struct fb_info
*info
)
954 struct drm_fb_helper
*fb_helper
= info
->par
;
955 struct drm_device
*dev
= fb_helper
->dev
;
956 struct drm_mode_set
*modeset
;
960 drm_modeset_lock_all(dev
);
961 if (!drm_fb_helper_is_bound(fb_helper
)) {
962 drm_modeset_unlock_all(dev
);
966 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
967 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
969 modeset
->x
= var
->xoffset
;
970 modeset
->y
= var
->yoffset
;
972 if (modeset
->num_connectors
) {
973 ret
= drm_mode_set_config_internal(modeset
);
975 info
->var
.xoffset
= var
->xoffset
;
976 info
->var
.yoffset
= var
->yoffset
;
980 drm_modeset_unlock_all(dev
);
983 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
986 * Allocates the backing storage and sets up the fbdev info structure through
987 * the ->fb_probe callback and then registers the fbdev and sets up the panic
990 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
996 struct fb_info
*info
;
997 struct drm_fb_helper_surface_size sizes
;
1000 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
1001 sizes
.surface_depth
= 24;
1002 sizes
.surface_bpp
= 32;
1003 sizes
.fb_width
= (unsigned)-1;
1004 sizes
.fb_height
= (unsigned)-1;
1006 /* if driver picks 8 or 16 by default use that
1007 for both depth/bpp */
1008 if (preferred_bpp
!= sizes
.surface_bpp
)
1009 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
1011 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1012 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1013 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
1014 struct drm_cmdline_mode
*cmdline_mode
;
1016 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
1018 if (cmdline_mode
->bpp_specified
) {
1019 switch (cmdline_mode
->bpp
) {
1021 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
1024 sizes
.surface_depth
= 15;
1025 sizes
.surface_bpp
= 16;
1028 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
1031 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
1034 sizes
.surface_depth
= 24;
1035 sizes
.surface_bpp
= 32;
1043 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1044 struct drm_display_mode
*desired_mode
;
1045 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
1048 if (gamma_size
== 0)
1049 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
1050 if (desired_mode
->hdisplay
< sizes
.fb_width
)
1051 sizes
.fb_width
= desired_mode
->hdisplay
;
1052 if (desired_mode
->vdisplay
< sizes
.fb_height
)
1053 sizes
.fb_height
= desired_mode
->vdisplay
;
1054 if (desired_mode
->hdisplay
> sizes
.surface_width
)
1055 sizes
.surface_width
= desired_mode
->hdisplay
;
1056 if (desired_mode
->vdisplay
> sizes
.surface_height
)
1057 sizes
.surface_height
= desired_mode
->vdisplay
;
1062 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
1063 /* hmm everyone went away - assume VGA cable just fell out
1064 and will come back later. */
1065 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1066 sizes
.fb_width
= sizes
.surface_width
= 1024;
1067 sizes
.fb_height
= sizes
.surface_height
= 768;
1070 /* push down into drivers */
1071 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
1075 info
= fb_helper
->fbdev
;
1078 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1079 * events, but at init time drm_setup_crtcs needs to be called before
1080 * the fb is allocated (since we need to figure out the desired size of
1081 * the fb before we can allocate it ...). Hence we need to fix things up
1084 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
1085 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
1086 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
1089 info
->var
.pixclock
= 0;
1090 if (register_framebuffer(info
) < 0)
1093 dev_info(fb_helper
->dev
->dev
, "fb%d: %s frame buffer device\n",
1094 info
->node
, info
->fix
.id
);
1096 /* Switch back to kernel console on panic */
1097 /* multi card linked list maybe */
1098 if (list_empty(&kernel_fb_helper_list
)) {
1099 dev_info(fb_helper
->dev
->dev
, "registered panic notifier\n");
1100 atomic_notifier_chain_register(&panic_notifier_list
,
1102 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
1105 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
1111 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1112 * @info: fbdev registered by the helper
1113 * @pitch: desired pitch
1114 * @depth: desired depth
1116 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1117 * fbdev emulations. Drivers which support acceleration methods which impose
1118 * additional constraints need to set up their own limits.
1120 * Drivers should call this (or their equivalent setup code) from their
1121 * ->fb_probe callback.
1123 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1126 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1127 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1128 FB_VISUAL_TRUECOLOR
;
1129 info
->fix
.mmio_start
= 0;
1130 info
->fix
.mmio_len
= 0;
1131 info
->fix
.type_aux
= 0;
1132 info
->fix
.xpanstep
= 1; /* doing it in hw */
1133 info
->fix
.ypanstep
= 1; /* doing it in hw */
1134 info
->fix
.ywrapstep
= 0;
1135 info
->fix
.accel
= FB_ACCEL_NONE
;
1137 info
->fix
.line_length
= pitch
;
1140 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1143 * drm_fb_helper_fill_var - initalizes variable fbdev information
1144 * @info: fbdev instance to set up
1145 * @fb_helper: fb helper instance to use as template
1146 * @fb_width: desired fb width
1147 * @fb_height: desired fb height
1149 * Sets up the variable fbdev metainformation from the given fb helper instance
1150 * and the drm framebuffer allocated in fb_helper->fb.
1152 * Drivers should call this (or their equivalent setup code) from their
1153 * ->fb_probe callback after having allocated the fbdev backing
1154 * storage framebuffer.
1156 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1157 uint32_t fb_width
, uint32_t fb_height
)
1159 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1160 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1161 info
->var
.xres_virtual
= fb
->width
;
1162 info
->var
.yres_virtual
= fb
->height
;
1163 info
->var
.bits_per_pixel
= fb
->bits_per_pixel
;
1164 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1165 info
->var
.xoffset
= 0;
1166 info
->var
.yoffset
= 0;
1167 info
->var
.activate
= FB_ACTIVATE_NOW
;
1168 info
->var
.height
= -1;
1169 info
->var
.width
= -1;
1171 switch (fb
->depth
) {
1173 info
->var
.red
.offset
= 0;
1174 info
->var
.green
.offset
= 0;
1175 info
->var
.blue
.offset
= 0;
1176 info
->var
.red
.length
= 8; /* 8bit DAC */
1177 info
->var
.green
.length
= 8;
1178 info
->var
.blue
.length
= 8;
1179 info
->var
.transp
.offset
= 0;
1180 info
->var
.transp
.length
= 0;
1183 info
->var
.red
.offset
= 10;
1184 info
->var
.green
.offset
= 5;
1185 info
->var
.blue
.offset
= 0;
1186 info
->var
.red
.length
= 5;
1187 info
->var
.green
.length
= 5;
1188 info
->var
.blue
.length
= 5;
1189 info
->var
.transp
.offset
= 15;
1190 info
->var
.transp
.length
= 1;
1193 info
->var
.red
.offset
= 11;
1194 info
->var
.green
.offset
= 5;
1195 info
->var
.blue
.offset
= 0;
1196 info
->var
.red
.length
= 5;
1197 info
->var
.green
.length
= 6;
1198 info
->var
.blue
.length
= 5;
1199 info
->var
.transp
.offset
= 0;
1202 info
->var
.red
.offset
= 16;
1203 info
->var
.green
.offset
= 8;
1204 info
->var
.blue
.offset
= 0;
1205 info
->var
.red
.length
= 8;
1206 info
->var
.green
.length
= 8;
1207 info
->var
.blue
.length
= 8;
1208 info
->var
.transp
.offset
= 0;
1209 info
->var
.transp
.length
= 0;
1212 info
->var
.red
.offset
= 16;
1213 info
->var
.green
.offset
= 8;
1214 info
->var
.blue
.offset
= 0;
1215 info
->var
.red
.length
= 8;
1216 info
->var
.green
.length
= 8;
1217 info
->var
.blue
.length
= 8;
1218 info
->var
.transp
.offset
= 24;
1219 info
->var
.transp
.length
= 8;
1225 info
->var
.xres
= fb_width
;
1226 info
->var
.yres
= fb_height
;
1228 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1230 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1234 struct drm_connector
*connector
;
1238 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1239 connector
= fb_helper
->connector_info
[i
]->connector
;
1240 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1246 struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1248 struct drm_display_mode
*mode
;
1250 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1251 if (mode
->hdisplay
> width
||
1252 mode
->vdisplay
> height
)
1254 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1259 EXPORT_SYMBOL(drm_has_preferred_mode
);
1261 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1263 struct drm_cmdline_mode
*cmdline_mode
;
1264 cmdline_mode
= &fb_connector
->cmdline_mode
;
1265 return cmdline_mode
->specified
;
1268 struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
,
1269 int width
, int height
)
1271 struct drm_cmdline_mode
*cmdline_mode
;
1272 struct drm_display_mode
*mode
= NULL
;
1273 bool prefer_non_interlace
;
1275 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
1276 if (cmdline_mode
->specified
== false)
1279 /* attempt to find a matching mode in the list of modes
1280 * we have gotten so far, if not add a CVT mode that conforms
1282 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1285 prefer_non_interlace
= !cmdline_mode
->interlace
;
1287 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1288 /* check width/height */
1289 if (mode
->hdisplay
!= cmdline_mode
->xres
||
1290 mode
->vdisplay
!= cmdline_mode
->yres
)
1293 if (cmdline_mode
->refresh_specified
) {
1294 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
1298 if (cmdline_mode
->interlace
) {
1299 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
1301 } else if (prefer_non_interlace
) {
1302 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
1308 if (prefer_non_interlace
) {
1309 prefer_non_interlace
= false;
1314 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
1316 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
1319 EXPORT_SYMBOL(drm_pick_cmdline_mode
);
1321 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
1326 enable
= connector
->status
== connector_status_connected
;
1328 enable
= connector
->status
!= connector_status_disconnected
;
1333 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
1336 bool any_enabled
= false;
1337 struct drm_connector
*connector
;
1340 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1341 connector
= fb_helper
->connector_info
[i
]->connector
;
1342 enabled
[i
] = drm_connector_enabled(connector
, true);
1343 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
1344 enabled
[i
] ? "yes" : "no");
1345 any_enabled
|= enabled
[i
];
1351 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1352 connector
= fb_helper
->connector_info
[i
]->connector
;
1353 enabled
[i
] = drm_connector_enabled(connector
, false);
1357 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
1358 struct drm_display_mode
**modes
,
1359 bool *enabled
, int width
, int height
)
1362 bool can_clone
= false;
1363 struct drm_fb_helper_connector
*fb_helper_conn
;
1364 struct drm_display_mode
*dmt_mode
, *mode
;
1366 /* only contemplate cloning in the single crtc case */
1367 if (fb_helper
->crtc_count
> 1)
1371 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1376 /* only contemplate cloning if more than one connector is enabled */
1380 /* check the command line or if nothing common pick 1024x768 */
1382 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1385 fb_helper_conn
= fb_helper
->connector_info
[i
];
1386 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1391 for (j
= 0; j
< i
; j
++) {
1394 if (!drm_mode_equal(modes
[j
], modes
[i
]))
1400 DRM_DEBUG_KMS("can clone using command line\n");
1404 /* try and find a 1024x768 mode on each connector */
1406 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
1408 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1413 fb_helper_conn
= fb_helper
->connector_info
[i
];
1414 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1415 if (drm_mode_equal(mode
, dmt_mode
))
1423 DRM_DEBUG_KMS("can clone using 1024x768\n");
1426 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1430 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
1431 struct drm_display_mode
**modes
,
1432 bool *enabled
, int width
, int height
)
1434 struct drm_fb_helper_connector
*fb_helper_conn
;
1437 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1438 fb_helper_conn
= fb_helper
->connector_info
[i
];
1440 if (enabled
[i
] == false)
1443 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1444 fb_helper_conn
->connector
->base
.id
);
1446 /* got for command line mode first */
1447 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1449 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1450 fb_helper_conn
->connector
->base
.id
);
1451 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
1453 /* No preferred modes, pick one off the list */
1454 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
1455 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
1458 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
1464 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
1465 struct drm_fb_helper_crtc
**best_crtcs
,
1466 struct drm_display_mode
**modes
,
1467 int n
, int width
, int height
)
1470 struct drm_device
*dev
= fb_helper
->dev
;
1471 struct drm_connector
*connector
;
1472 struct drm_connector_helper_funcs
*connector_funcs
;
1473 struct drm_encoder
*encoder
;
1474 int my_score
, best_score
, score
;
1475 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
1476 struct drm_fb_helper_connector
*fb_helper_conn
;
1478 if (n
== fb_helper
->connector_count
)
1481 fb_helper_conn
= fb_helper
->connector_info
[n
];
1482 connector
= fb_helper_conn
->connector
;
1484 best_crtcs
[n
] = NULL
;
1485 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
1486 if (modes
[n
] == NULL
)
1489 crtcs
= kzalloc(dev
->mode_config
.num_connector
*
1490 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1495 if (connector
->status
== connector_status_connected
)
1497 if (drm_has_cmdline_mode(fb_helper_conn
))
1499 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
1502 connector_funcs
= connector
->helper_private
;
1503 encoder
= connector_funcs
->best_encoder(connector
);
1507 /* select a crtc for this connector and then attempt to configure
1508 remaining connectors */
1509 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
1510 crtc
= &fb_helper
->crtc_info
[c
];
1512 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
1515 for (o
= 0; o
< n
; o
++)
1516 if (best_crtcs
[o
] == crtc
)
1520 /* ignore cloning unless only a single crtc */
1521 if (fb_helper
->crtc_count
> 1)
1524 if (!drm_mode_equal(modes
[o
], modes
[n
]))
1529 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
1530 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
1532 if (score
> best_score
) {
1534 memcpy(best_crtcs
, crtcs
,
1535 dev
->mode_config
.num_connector
*
1536 sizeof(struct drm_fb_helper_crtc
*));
1544 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
)
1546 struct drm_device
*dev
= fb_helper
->dev
;
1547 struct drm_fb_helper_crtc
**crtcs
;
1548 struct drm_display_mode
**modes
;
1549 struct drm_mode_set
*modeset
;
1554 DRM_DEBUG_KMS("\n");
1556 width
= dev
->mode_config
.max_width
;
1557 height
= dev
->mode_config
.max_height
;
1559 crtcs
= kcalloc(dev
->mode_config
.num_connector
,
1560 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1561 modes
= kcalloc(dev
->mode_config
.num_connector
,
1562 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
1563 enabled
= kcalloc(dev
->mode_config
.num_connector
,
1564 sizeof(bool), GFP_KERNEL
);
1565 if (!crtcs
|| !modes
|| !enabled
) {
1566 DRM_ERROR("Memory allocation failed\n");
1571 drm_enable_connectors(fb_helper
, enabled
);
1573 if (!(fb_helper
->funcs
->initial_config
&&
1574 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
1575 enabled
, width
, height
))) {
1576 memset(modes
, 0, dev
->mode_config
.num_connector
*sizeof(modes
[0]));
1577 memset(crtcs
, 0, dev
->mode_config
.num_connector
*sizeof(crtcs
[0]));
1579 if (!drm_target_cloned(fb_helper
,
1580 modes
, enabled
, width
, height
) &&
1581 !drm_target_preferred(fb_helper
,
1582 modes
, enabled
, width
, height
))
1583 DRM_ERROR("Unable to find initial modes\n");
1585 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1588 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
1591 /* need to set the modesets up here for use later */
1592 /* fill out the connector<->crtc mappings into the modesets */
1593 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1594 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1595 modeset
->num_connectors
= 0;
1599 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1600 struct drm_display_mode
*mode
= modes
[i
];
1601 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
1602 modeset
= &fb_crtc
->mode_set
;
1604 if (mode
&& fb_crtc
) {
1605 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1606 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
);
1607 fb_crtc
->desired_mode
= mode
;
1609 drm_mode_destroy(dev
, modeset
->mode
);
1610 modeset
->mode
= drm_mode_duplicate(dev
,
1611 fb_crtc
->desired_mode
);
1612 modeset
->connectors
[modeset
->num_connectors
++] = fb_helper
->connector_info
[i
]->connector
;
1613 modeset
->fb
= fb_helper
->fb
;
1617 /* Clear out any old modes if there are no more connected outputs. */
1618 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1619 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1620 if (modeset
->num_connectors
== 0) {
1621 BUG_ON(modeset
->fb
);
1622 BUG_ON(modeset
->num_connectors
);
1624 drm_mode_destroy(dev
, modeset
->mode
);
1625 modeset
->mode
= NULL
;
1635 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1636 * @fb_helper: fb_helper device struct
1637 * @bpp_sel: bpp value to use for the framebuffer configuration
1639 * Scans the CRTCs and connectors and tries to put together an initial setup.
1640 * At the moment, this is a cloned configuration across all heads with
1641 * a new framebuffer object as the backing store.
1643 * Note that this also registers the fbdev and so allows userspace to call into
1644 * the driver through the fbdev interfaces.
1646 * This function will call down into the ->fb_probe callback to let
1647 * the driver allocate and initialize the fbdev info structure and the drm
1648 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1649 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1650 * values for the fbdev info structure.
1653 * Zero if everything went ok, nonzero otherwise.
1655 bool drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
1657 struct drm_device
*dev
= fb_helper
->dev
;
1660 drm_fb_helper_parse_command_line(fb_helper
);
1662 mutex_lock(&dev
->mode_config
.mutex
);
1663 count
= drm_fb_helper_probe_connector_modes(fb_helper
,
1664 dev
->mode_config
.max_width
,
1665 dev
->mode_config
.max_height
);
1666 mutex_unlock(&dev
->mode_config
.mutex
);
1668 * we shouldn't end up with no modes here.
1671 dev_info(fb_helper
->dev
->dev
, "No connectors reported connected with modes\n");
1673 drm_setup_crtcs(fb_helper
);
1675 return drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
1677 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
1680 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1681 * probing all the outputs attached to the fb
1682 * @fb_helper: the drm_fb_helper
1684 * Scan the connectors attached to the fb_helper and try to put together a
1685 * setup after *notification of a change in output configuration.
1687 * Called at runtime, takes the mode config locks to be able to check/change the
1688 * modeset configuration. Must be run from process context (which usually means
1689 * either the output polling work or a work item launched from the driver's
1690 * hotplug interrupt).
1692 * Note that drivers may call this even before calling
1693 * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1694 * for a race-free fbcon setup and will make sure that the fbdev emulation will
1695 * not miss any hotplug events.
1698 * 0 on success and a non-zero error code otherwise.
1700 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
1702 struct drm_device
*dev
= fb_helper
->dev
;
1703 u32 max_width
, max_height
;
1705 mutex_lock(&fb_helper
->dev
->mode_config
.mutex
);
1706 if (!fb_helper
->fb
|| !drm_fb_helper_is_bound(fb_helper
)) {
1707 fb_helper
->delayed_hotplug
= true;
1708 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1711 DRM_DEBUG_KMS("\n");
1713 max_width
= fb_helper
->fb
->width
;
1714 max_height
= fb_helper
->fb
->height
;
1716 drm_fb_helper_probe_connector_modes(fb_helper
, max_width
, max_height
);
1717 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1719 drm_modeset_lock_all(dev
);
1720 drm_setup_crtcs(fb_helper
);
1721 drm_modeset_unlock_all(dev
);
1722 drm_fb_helper_set_par(fb_helper
->fbdev
);
1726 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
1728 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1729 * but the module doesn't depend on any fb console symbols. At least
1730 * attempt to load fbcon to avoid leaving the system without a usable console.
1732 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1733 static int __init
drm_fb_helper_modinit(void)
1735 const char *name
= "fbcon";
1736 struct module
*fbcon
;
1738 mutex_lock(&module_mutex
);
1739 fbcon
= find_module(name
);
1740 mutex_unlock(&module_mutex
);
1743 request_module_nowait(name
);
1747 module_init(drm_fb_helper_modinit
);