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 MODULE_AUTHOR("David Airlie, Jesse Barnes");
43 MODULE_DESCRIPTION("DRM KMS helper");
44 MODULE_LICENSE("GPL and additional rights");
46 static LIST_HEAD(kernel_fb_helper_list
);
51 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
52 * mode setting driver. They can be used mostly independantely from the crtc
53 * helper functions used by many drivers to implement the kernel mode setting
56 * Initialization is done as a three-step process with drm_fb_helper_init(),
57 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
58 * Drivers with fancier requirements than the default beheviour can override the
59 * second step with their own code. Teardown is done with drm_fb_helper_fini().
61 * At runtime drivers should restore the fbdev console by calling
62 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
63 * should also notify the fb helper code from updates to the output
64 * configuration by calling drm_fb_helper_hotplug_event(). For easier
65 * integration with the output polling code in drm_crtc_helper.c the modeset
66 * code proves a ->output_poll_changed callback.
68 * All other functions exported by the fb helper library can be used to
69 * implement the fbdev driver interface by the driver.
73 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
75 * @fb_helper: fbdev initialized with drm_fb_helper_init
77 * This functions adds all the available connectors for use with the given
78 * fb_helper. This is a separate step to allow drivers to freely assign
79 * connectors to the fbdev, e.g. if some are reserved for special purposes or
80 * not adequate to be used for the fbcon.
82 * Since this is part of the initial setup before the fbdev is published, no
83 * locking is required.
85 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper
*fb_helper
)
87 struct drm_device
*dev
= fb_helper
->dev
;
88 struct drm_connector
*connector
;
91 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
92 struct drm_fb_helper_connector
*fb_helper_connector
;
94 fb_helper_connector
= kzalloc(sizeof(struct drm_fb_helper_connector
), GFP_KERNEL
);
95 if (!fb_helper_connector
)
98 fb_helper_connector
->connector
= connector
;
99 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_helper_connector
;
103 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
104 kfree(fb_helper
->connector_info
[i
]);
105 fb_helper
->connector_info
[i
] = NULL
;
107 fb_helper
->connector_count
= 0;
110 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors
);
112 static int drm_fb_helper_parse_command_line(struct drm_fb_helper
*fb_helper
)
114 struct drm_fb_helper_connector
*fb_helper_conn
;
117 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
118 struct drm_cmdline_mode
*mode
;
119 struct drm_connector
*connector
;
122 fb_helper_conn
= fb_helper
->connector_info
[i
];
123 connector
= fb_helper_conn
->connector
;
124 mode
= &fb_helper_conn
->cmdline_mode
;
126 /* do something on return - turn off connector maybe */
127 if (fb_get_options(drm_get_connector_name(connector
), &option
))
130 if (drm_mode_parse_command_line_for_connector(option
,
135 switch (mode
->force
) {
139 case DRM_FORCE_ON_DIGITAL
:
148 DRM_INFO("forcing %s connector %s\n",
149 drm_get_connector_name(connector
), s
);
150 connector
->force
= mode
->force
;
153 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
154 drm_get_connector_name(connector
),
155 mode
->xres
, mode
->yres
,
156 mode
->refresh_specified
? mode
->refresh
: 60,
157 mode
->rb
? " reduced blanking" : "",
158 mode
->margins
? " with margins" : "",
159 mode
->interlace
? " interlaced" : "");
166 static void drm_fb_helper_save_lut_atomic(struct drm_crtc
*crtc
, struct drm_fb_helper
*helper
)
168 uint16_t *r_base
, *g_base
, *b_base
;
171 if (helper
->funcs
->gamma_get
== NULL
)
174 r_base
= crtc
->gamma_store
;
175 g_base
= r_base
+ crtc
->gamma_size
;
176 b_base
= g_base
+ crtc
->gamma_size
;
178 for (i
= 0; i
< crtc
->gamma_size
; i
++)
179 helper
->funcs
->gamma_get(crtc
, &r_base
[i
], &g_base
[i
], &b_base
[i
], i
);
182 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc
*crtc
)
184 uint16_t *r_base
, *g_base
, *b_base
;
186 if (crtc
->funcs
->gamma_set
== NULL
)
189 r_base
= crtc
->gamma_store
;
190 g_base
= r_base
+ crtc
->gamma_size
;
191 b_base
= g_base
+ crtc
->gamma_size
;
193 crtc
->funcs
->gamma_set(crtc
, r_base
, g_base
, b_base
, 0, crtc
->gamma_size
);
197 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
198 * @info: fbdev registered by the helper
200 int drm_fb_helper_debug_enter(struct fb_info
*info
)
202 struct drm_fb_helper
*helper
= info
->par
;
203 struct drm_crtc_helper_funcs
*funcs
;
206 if (list_empty(&kernel_fb_helper_list
))
209 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
210 for (i
= 0; i
< helper
->crtc_count
; i
++) {
211 struct drm_mode_set
*mode_set
=
212 &helper
->crtc_info
[i
].mode_set
;
214 if (!mode_set
->crtc
->enabled
)
217 funcs
= mode_set
->crtc
->helper_private
;
218 drm_fb_helper_save_lut_atomic(mode_set
->crtc
, helper
);
219 funcs
->mode_set_base_atomic(mode_set
->crtc
,
223 ENTER_ATOMIC_MODE_SET
);
229 EXPORT_SYMBOL(drm_fb_helper_debug_enter
);
231 /* Find the real fb for a given fb helper CRTC */
232 static struct drm_framebuffer
*drm_mode_config_fb(struct drm_crtc
*crtc
)
234 struct drm_device
*dev
= crtc
->dev
;
237 list_for_each_entry(c
, &dev
->mode_config
.crtc_list
, head
) {
238 if (crtc
->base
.id
== c
->base
.id
)
246 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
247 * @info: fbdev registered by the helper
249 int drm_fb_helper_debug_leave(struct fb_info
*info
)
251 struct drm_fb_helper
*helper
= info
->par
;
252 struct drm_crtc
*crtc
;
253 struct drm_crtc_helper_funcs
*funcs
;
254 struct drm_framebuffer
*fb
;
257 for (i
= 0; i
< helper
->crtc_count
; i
++) {
258 struct drm_mode_set
*mode_set
= &helper
->crtc_info
[i
].mode_set
;
259 crtc
= mode_set
->crtc
;
260 funcs
= crtc
->helper_private
;
261 fb
= drm_mode_config_fb(crtc
);
267 DRM_ERROR("no fb to restore??\n");
271 drm_fb_helper_restore_lut_atomic(mode_set
->crtc
);
272 funcs
->mode_set_base_atomic(mode_set
->crtc
, fb
, crtc
->x
,
273 crtc
->y
, LEAVE_ATOMIC_MODE_SET
);
278 EXPORT_SYMBOL(drm_fb_helper_debug_leave
);
281 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
282 * @fb_helper: fbcon to restore
284 * This should be called from driver's drm ->lastclose callback
285 * when implementing an fbcon on top of kms using this helper. This ensures that
286 * the user isn't greeted with a black screen when e.g. X dies.
288 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
290 struct drm_device
*dev
= fb_helper
->dev
;
291 struct drm_plane
*plane
;
295 drm_warn_on_modeset_not_all_locked(dev
);
297 list_for_each_entry(plane
, &dev
->mode_config
.plane_list
, head
)
298 drm_plane_force_disable(plane
);
300 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
301 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
302 struct drm_crtc
*crtc
= mode_set
->crtc
;
305 if (crtc
->funcs
->cursor_set
) {
306 ret
= crtc
->funcs
->cursor_set(crtc
, NULL
, 0, 0, 0);
311 ret
= drm_mode_set_config_internal(mode_set
);
317 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode
);
320 * restore fbcon display for all kms driver's using this helper, used for sysrq
321 * and panic handling.
323 static bool drm_fb_helper_force_kernel_mode(void)
325 bool ret
, error
= false;
326 struct drm_fb_helper
*helper
;
328 if (list_empty(&kernel_fb_helper_list
))
331 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
332 if (helper
->dev
->switch_power_state
== DRM_SWITCH_POWER_OFF
)
335 ret
= drm_fb_helper_restore_fbdev_mode(helper
);
342 static int drm_fb_helper_panic(struct notifier_block
*n
, unsigned long ununsed
,
346 * It's a waste of time and effort to switch back to text console
347 * if the kernel should reboot before panic messages can be seen.
349 if (panic_timeout
< 0)
352 pr_err("panic occurred, switching back to text console\n");
353 return drm_fb_helper_force_kernel_mode();
356 static struct notifier_block paniced
= {
357 .notifier_call
= drm_fb_helper_panic
,
360 static bool drm_fb_helper_is_bound(struct drm_fb_helper
*fb_helper
)
362 struct drm_device
*dev
= fb_helper
->dev
;
363 struct drm_crtc
*crtc
;
364 int bound
= 0, crtcs_bound
= 0;
366 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
369 if (crtc
->fb
== fb_helper
->fb
)
373 if (bound
< crtcs_bound
)
378 #ifdef CONFIG_MAGIC_SYSRQ
379 static void drm_fb_helper_restore_work_fn(struct work_struct
*ignored
)
382 ret
= drm_fb_helper_force_kernel_mode();
384 DRM_ERROR("Failed to restore crtc configuration\n");
386 static DECLARE_WORK(drm_fb_helper_restore_work
, drm_fb_helper_restore_work_fn
);
388 static void drm_fb_helper_sysrq(int dummy1
)
390 schedule_work(&drm_fb_helper_restore_work
);
393 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
394 .handler
= drm_fb_helper_sysrq
,
395 .help_msg
= "force-fb(V)",
396 .action_msg
= "Restore framebuffer console",
399 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= { };
402 static void drm_fb_helper_dpms(struct fb_info
*info
, int dpms_mode
)
404 struct drm_fb_helper
*fb_helper
= info
->par
;
405 struct drm_device
*dev
= fb_helper
->dev
;
406 struct drm_crtc
*crtc
;
407 struct drm_connector
*connector
;
411 * fbdev->blank can be called from irq context in case of a panic.
412 * Since we already have our own special panic handler which will
413 * restore the fbdev console mode completely, just bail out early.
415 if (oops_in_progress
)
419 * fbdev->blank can be called from irq context in case of a panic.
420 * Since we already have our own special panic handler which will
421 * restore the fbdev console mode completely, just bail out early.
423 if (oops_in_progress
)
427 * For each CRTC in this fb, turn the connectors on/off.
429 drm_modeset_lock_all(dev
);
430 if (!drm_fb_helper_is_bound(fb_helper
)) {
431 drm_modeset_unlock_all(dev
);
435 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
436 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
441 /* Walk the connectors & encoders on this fb turning them on/off */
442 for (j
= 0; j
< fb_helper
->connector_count
; j
++) {
443 connector
= fb_helper
->connector_info
[j
]->connector
;
444 connector
->funcs
->dpms(connector
, dpms_mode
);
445 drm_object_property_set_value(&connector
->base
,
446 dev
->mode_config
.dpms_property
, dpms_mode
);
449 drm_modeset_unlock_all(dev
);
453 * drm_fb_helper_blank - implementation for ->fb_blank
454 * @blank: desired blanking state
455 * @info: fbdev registered by the helper
457 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
460 /* Display: On; HSync: On, VSync: On */
461 case FB_BLANK_UNBLANK
:
462 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
464 /* Display: Off; HSync: On, VSync: On */
465 case FB_BLANK_NORMAL
:
466 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
468 /* Display: Off; HSync: Off, VSync: On */
469 case FB_BLANK_HSYNC_SUSPEND
:
470 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
472 /* Display: Off; HSync: On, VSync: Off */
473 case FB_BLANK_VSYNC_SUSPEND
:
474 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
476 /* Display: Off; HSync: Off, VSync: Off */
477 case FB_BLANK_POWERDOWN
:
478 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
483 EXPORT_SYMBOL(drm_fb_helper_blank
);
485 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
489 for (i
= 0; i
< helper
->connector_count
; i
++)
490 kfree(helper
->connector_info
[i
]);
491 kfree(helper
->connector_info
);
492 for (i
= 0; i
< helper
->crtc_count
; i
++) {
493 kfree(helper
->crtc_info
[i
].mode_set
.connectors
);
494 if (helper
->crtc_info
[i
].mode_set
.mode
)
495 drm_mode_destroy(helper
->dev
, helper
->crtc_info
[i
].mode_set
.mode
);
497 kfree(helper
->crtc_info
);
501 * drm_fb_helper_init - initialize a drm_fb_helper structure
503 * @fb_helper: driver-allocated fbdev helper structure to initialize
504 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
505 * @max_conn_count: max connector count
507 * This allocates the structures for the fbdev helper with the given limits.
508 * Note that this won't yet touch the hardware (through the driver interfaces)
509 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
510 * to allow driver writes more control over the exact init sequence.
512 * Drivers must set fb_helper->funcs before calling
513 * drm_fb_helper_initial_config().
516 * Zero if everything went ok, nonzero otherwise.
518 int drm_fb_helper_init(struct drm_device
*dev
,
519 struct drm_fb_helper
*fb_helper
,
520 int crtc_count
, int max_conn_count
)
522 struct drm_crtc
*crtc
;
525 fb_helper
->dev
= dev
;
527 INIT_LIST_HEAD(&fb_helper
->kernel_fb_list
);
529 fb_helper
->crtc_info
= kcalloc(crtc_count
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
530 if (!fb_helper
->crtc_info
)
533 fb_helper
->crtc_count
= crtc_count
;
534 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
535 if (!fb_helper
->connector_info
) {
536 kfree(fb_helper
->crtc_info
);
539 fb_helper
->connector_count
= 0;
541 for (i
= 0; i
< crtc_count
; i
++) {
542 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
543 kcalloc(max_conn_count
,
544 sizeof(struct drm_connector
*),
547 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
549 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
553 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
554 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
560 drm_fb_helper_crtc_free(fb_helper
);
563 EXPORT_SYMBOL(drm_fb_helper_init
);
565 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
567 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
568 list_del(&fb_helper
->kernel_fb_list
);
569 if (list_empty(&kernel_fb_helper_list
)) {
570 pr_info("drm: unregistered panic notifier\n");
571 atomic_notifier_chain_unregister(&panic_notifier_list
,
573 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
577 drm_fb_helper_crtc_free(fb_helper
);
580 EXPORT_SYMBOL(drm_fb_helper_fini
);
582 static int setcolreg(struct drm_crtc
*crtc
, u16 red
, u16 green
,
583 u16 blue
, u16 regno
, struct fb_info
*info
)
585 struct drm_fb_helper
*fb_helper
= info
->par
;
586 struct drm_framebuffer
*fb
= fb_helper
->fb
;
589 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
) {
592 /* place color in psuedopalette */
595 palette
= (u32
*)info
->pseudo_palette
;
596 red
>>= (16 - info
->var
.red
.length
);
597 green
>>= (16 - info
->var
.green
.length
);
598 blue
>>= (16 - info
->var
.blue
.length
);
599 value
= (red
<< info
->var
.red
.offset
) |
600 (green
<< info
->var
.green
.offset
) |
601 (blue
<< info
->var
.blue
.offset
);
602 if (info
->var
.transp
.length
> 0) {
603 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
604 mask
<<= info
->var
.transp
.offset
;
607 palette
[regno
] = value
;
612 * The driver really shouldn't advertise pseudo/directcolor
613 * visuals if it can't deal with the palette.
615 if (WARN_ON(!fb_helper
->funcs
->gamma_set
||
616 !fb_helper
->funcs
->gamma_get
))
621 if (fb
->bits_per_pixel
== 16) {
624 if (fb
->depth
== 16 && regno
> 63)
626 if (fb
->depth
== 15 && regno
> 31)
629 if (fb
->depth
== 16) {
633 for (i
= 0; i
< 8; i
++)
634 fb_helper
->funcs
->gamma_set(crtc
, red
,
635 green
, blue
, pindex
+ i
);
638 fb_helper
->funcs
->gamma_get(crtc
, &r
,
642 for (i
= 0; i
< 4; i
++)
643 fb_helper
->funcs
->gamma_set(crtc
, r
,
650 fb_helper
->funcs
->gamma_set(crtc
, red
, green
, blue
, pindex
);
655 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
657 * @info: fbdev registered by the helper
659 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
661 struct drm_fb_helper
*fb_helper
= info
->par
;
662 struct drm_device
*dev
= fb_helper
->dev
;
663 struct drm_crtc_helper_funcs
*crtc_funcs
;
664 u16
*red
, *green
, *blue
, *transp
;
665 struct drm_crtc
*crtc
;
669 drm_modeset_lock_all(dev
);
670 if (!drm_fb_helper_is_bound(fb_helper
)) {
671 drm_modeset_unlock_all(dev
);
675 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
676 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
677 crtc_funcs
= crtc
->helper_private
;
682 transp
= cmap
->transp
;
685 for (j
= 0; j
< cmap
->len
; j
++) {
686 u16 hred
, hgreen
, hblue
, htransp
= 0xffff;
695 rc
= setcolreg(crtc
, hred
, hgreen
, hblue
, start
++, info
);
699 if (crtc_funcs
->load_lut
)
700 crtc_funcs
->load_lut(crtc
);
703 drm_modeset_unlock_all(dev
);
706 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
709 * drm_fb_helper_check_var - implementation for ->fb_check_var
710 * @var: screeninfo to check
711 * @info: fbdev registered by the helper
713 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
714 struct fb_info
*info
)
716 struct drm_fb_helper
*fb_helper
= info
->par
;
717 struct drm_framebuffer
*fb
= fb_helper
->fb
;
720 if (var
->pixclock
!= 0 || in_dbg_master())
723 /* Need to resize the fb object !!! */
724 if (var
->bits_per_pixel
> fb
->bits_per_pixel
||
725 var
->xres
> fb
->width
|| var
->yres
> fb
->height
||
726 var
->xres_virtual
> fb
->width
|| var
->yres_virtual
> fb
->height
) {
727 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
728 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
729 var
->xres
, var
->yres
, var
->bits_per_pixel
,
730 var
->xres_virtual
, var
->yres_virtual
,
731 fb
->width
, fb
->height
, fb
->bits_per_pixel
);
735 switch (var
->bits_per_pixel
) {
737 depth
= (var
->green
.length
== 6) ? 16 : 15;
740 depth
= (var
->transp
.length
> 0) ? 32 : 24;
743 depth
= var
->bits_per_pixel
;
750 var
->green
.offset
= 0;
751 var
->blue
.offset
= 0;
753 var
->green
.length
= 8;
754 var
->blue
.length
= 8;
755 var
->transp
.length
= 0;
756 var
->transp
.offset
= 0;
759 var
->red
.offset
= 10;
760 var
->green
.offset
= 5;
761 var
->blue
.offset
= 0;
763 var
->green
.length
= 5;
764 var
->blue
.length
= 5;
765 var
->transp
.length
= 1;
766 var
->transp
.offset
= 15;
769 var
->red
.offset
= 11;
770 var
->green
.offset
= 5;
771 var
->blue
.offset
= 0;
773 var
->green
.length
= 6;
774 var
->blue
.length
= 5;
775 var
->transp
.length
= 0;
776 var
->transp
.offset
= 0;
779 var
->red
.offset
= 16;
780 var
->green
.offset
= 8;
781 var
->blue
.offset
= 0;
783 var
->green
.length
= 8;
784 var
->blue
.length
= 8;
785 var
->transp
.length
= 0;
786 var
->transp
.offset
= 0;
789 var
->red
.offset
= 16;
790 var
->green
.offset
= 8;
791 var
->blue
.offset
= 0;
793 var
->green
.length
= 8;
794 var
->blue
.length
= 8;
795 var
->transp
.length
= 8;
796 var
->transp
.offset
= 24;
803 EXPORT_SYMBOL(drm_fb_helper_check_var
);
806 * drm_fb_helper_set_par - implementation for ->fb_set_par
807 * @info: fbdev registered by the helper
809 * This will let fbcon do the mode init and is called at initialization time by
810 * the fbdev core when registering the driver, and later on through the hotplug
813 int drm_fb_helper_set_par(struct fb_info
*info
)
815 struct drm_fb_helper
*fb_helper
= info
->par
;
816 struct drm_device
*dev
= fb_helper
->dev
;
817 struct fb_var_screeninfo
*var
= &info
->var
;
821 if (var
->pixclock
!= 0) {
822 DRM_ERROR("PIXEL CLOCK SET\n");
826 drm_modeset_lock_all(dev
);
827 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
828 ret
= drm_mode_set_config_internal(&fb_helper
->crtc_info
[i
].mode_set
);
830 drm_modeset_unlock_all(dev
);
834 drm_modeset_unlock_all(dev
);
836 if (fb_helper
->delayed_hotplug
) {
837 fb_helper
->delayed_hotplug
= false;
838 drm_fb_helper_hotplug_event(fb_helper
);
842 EXPORT_SYMBOL(drm_fb_helper_set_par
);
845 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
846 * @var: updated screen information
847 * @info: fbdev registered by the helper
849 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
850 struct fb_info
*info
)
852 struct drm_fb_helper
*fb_helper
= info
->par
;
853 struct drm_device
*dev
= fb_helper
->dev
;
854 struct drm_mode_set
*modeset
;
855 struct drm_crtc
*crtc
;
859 drm_modeset_lock_all(dev
);
860 if (!drm_fb_helper_is_bound(fb_helper
)) {
861 drm_modeset_unlock_all(dev
);
865 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
866 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
868 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
870 modeset
->x
= var
->xoffset
;
871 modeset
->y
= var
->yoffset
;
873 if (modeset
->num_connectors
) {
874 ret
= drm_mode_set_config_internal(modeset
);
876 info
->var
.xoffset
= var
->xoffset
;
877 info
->var
.yoffset
= var
->yoffset
;
881 drm_modeset_unlock_all(dev
);
884 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
887 * Allocates the backing storage and sets up the fbdev info structure through
888 * the ->fb_probe callback and then registers the fbdev and sets up the panic
891 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
897 struct fb_info
*info
;
898 struct drm_fb_helper_surface_size sizes
;
901 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
902 sizes
.surface_depth
= 24;
903 sizes
.surface_bpp
= 32;
904 sizes
.fb_width
= (unsigned)-1;
905 sizes
.fb_height
= (unsigned)-1;
907 /* if driver picks 8 or 16 by default use that
908 for both depth/bpp */
909 if (preferred_bpp
!= sizes
.surface_bpp
)
910 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
912 /* first up get a count of crtcs now in use and new min/maxes width/heights */
913 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
914 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
915 struct drm_cmdline_mode
*cmdline_mode
;
917 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
919 if (cmdline_mode
->bpp_specified
) {
920 switch (cmdline_mode
->bpp
) {
922 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
925 sizes
.surface_depth
= 15;
926 sizes
.surface_bpp
= 16;
929 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
932 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
935 sizes
.surface_depth
= 24;
936 sizes
.surface_bpp
= 32;
944 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
945 struct drm_display_mode
*desired_mode
;
946 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
950 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
951 if (desired_mode
->hdisplay
< sizes
.fb_width
)
952 sizes
.fb_width
= desired_mode
->hdisplay
;
953 if (desired_mode
->vdisplay
< sizes
.fb_height
)
954 sizes
.fb_height
= desired_mode
->vdisplay
;
955 if (desired_mode
->hdisplay
> sizes
.surface_width
)
956 sizes
.surface_width
= desired_mode
->hdisplay
;
957 if (desired_mode
->vdisplay
> sizes
.surface_height
)
958 sizes
.surface_height
= desired_mode
->vdisplay
;
963 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
964 /* hmm everyone went away - assume VGA cable just fell out
965 and will come back later. */
966 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
967 sizes
.fb_width
= sizes
.surface_width
= 1024;
968 sizes
.fb_height
= sizes
.surface_height
= 768;
971 /* push down into drivers */
972 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
976 info
= fb_helper
->fbdev
;
979 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
980 * events, but at init time drm_setup_crtcs needs to be called before
981 * the fb is allocated (since we need to figure out the desired size of
982 * the fb before we can allocate it ...). Hence we need to fix things up
985 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
986 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
987 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
990 info
->var
.pixclock
= 0;
991 if (register_framebuffer(info
) < 0)
994 dev_info(fb_helper
->dev
->dev
, "fb%d: %s frame buffer device\n",
995 info
->node
, info
->fix
.id
);
997 /* Switch back to kernel console on panic */
998 /* multi card linked list maybe */
999 if (list_empty(&kernel_fb_helper_list
)) {
1000 dev_info(fb_helper
->dev
->dev
, "registered panic notifier\n");
1001 atomic_notifier_chain_register(&panic_notifier_list
,
1003 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
1006 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
1012 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1013 * @info: fbdev registered by the helper
1014 * @pitch: desired pitch
1015 * @depth: desired depth
1017 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1018 * fbdev emulations. Drivers which support acceleration methods which impose
1019 * additional constraints need to set up their own limits.
1021 * Drivers should call this (or their equivalent setup code) from their
1022 * ->fb_probe callback.
1024 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1027 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1028 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1029 FB_VISUAL_TRUECOLOR
;
1030 info
->fix
.mmio_start
= 0;
1031 info
->fix
.mmio_len
= 0;
1032 info
->fix
.type_aux
= 0;
1033 info
->fix
.xpanstep
= 1; /* doing it in hw */
1034 info
->fix
.ypanstep
= 1; /* doing it in hw */
1035 info
->fix
.ywrapstep
= 0;
1036 info
->fix
.accel
= FB_ACCEL_NONE
;
1037 info
->fix
.type_aux
= 0;
1039 info
->fix
.line_length
= pitch
;
1042 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1045 * drm_fb_helper_fill_var - initalizes variable fbdev information
1046 * @info: fbdev instance to set up
1047 * @fb_helper: fb helper instance to use as template
1048 * @fb_width: desired fb width
1049 * @fb_height: desired fb height
1051 * Sets up the variable fbdev metainformation from the given fb helper instance
1052 * and the drm framebuffer allocated in fb_helper->fb.
1054 * Drivers should call this (or their equivalent setup code) from their
1055 * ->fb_probe callback after having allocated the fbdev backing
1056 * storage framebuffer.
1058 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1059 uint32_t fb_width
, uint32_t fb_height
)
1061 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1062 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1063 info
->var
.xres_virtual
= fb
->width
;
1064 info
->var
.yres_virtual
= fb
->height
;
1065 info
->var
.bits_per_pixel
= fb
->bits_per_pixel
;
1066 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1067 info
->var
.xoffset
= 0;
1068 info
->var
.yoffset
= 0;
1069 info
->var
.activate
= FB_ACTIVATE_NOW
;
1070 info
->var
.height
= -1;
1071 info
->var
.width
= -1;
1073 switch (fb
->depth
) {
1075 info
->var
.red
.offset
= 0;
1076 info
->var
.green
.offset
= 0;
1077 info
->var
.blue
.offset
= 0;
1078 info
->var
.red
.length
= 8; /* 8bit DAC */
1079 info
->var
.green
.length
= 8;
1080 info
->var
.blue
.length
= 8;
1081 info
->var
.transp
.offset
= 0;
1082 info
->var
.transp
.length
= 0;
1085 info
->var
.red
.offset
= 10;
1086 info
->var
.green
.offset
= 5;
1087 info
->var
.blue
.offset
= 0;
1088 info
->var
.red
.length
= 5;
1089 info
->var
.green
.length
= 5;
1090 info
->var
.blue
.length
= 5;
1091 info
->var
.transp
.offset
= 15;
1092 info
->var
.transp
.length
= 1;
1095 info
->var
.red
.offset
= 11;
1096 info
->var
.green
.offset
= 5;
1097 info
->var
.blue
.offset
= 0;
1098 info
->var
.red
.length
= 5;
1099 info
->var
.green
.length
= 6;
1100 info
->var
.blue
.length
= 5;
1101 info
->var
.transp
.offset
= 0;
1104 info
->var
.red
.offset
= 16;
1105 info
->var
.green
.offset
= 8;
1106 info
->var
.blue
.offset
= 0;
1107 info
->var
.red
.length
= 8;
1108 info
->var
.green
.length
= 8;
1109 info
->var
.blue
.length
= 8;
1110 info
->var
.transp
.offset
= 0;
1111 info
->var
.transp
.length
= 0;
1114 info
->var
.red
.offset
= 16;
1115 info
->var
.green
.offset
= 8;
1116 info
->var
.blue
.offset
= 0;
1117 info
->var
.red
.length
= 8;
1118 info
->var
.green
.length
= 8;
1119 info
->var
.blue
.length
= 8;
1120 info
->var
.transp
.offset
= 24;
1121 info
->var
.transp
.length
= 8;
1127 info
->var
.xres
= fb_width
;
1128 info
->var
.yres
= fb_height
;
1130 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1132 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1136 struct drm_connector
*connector
;
1140 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1141 connector
= fb_helper
->connector_info
[i
]->connector
;
1142 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1148 static struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1150 struct drm_display_mode
*mode
;
1152 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1153 if (drm_mode_width(mode
) > width
||
1154 drm_mode_height(mode
) > height
)
1156 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1162 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1164 struct drm_cmdline_mode
*cmdline_mode
;
1165 cmdline_mode
= &fb_connector
->cmdline_mode
;
1166 return cmdline_mode
->specified
;
1169 static struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
,
1170 int width
, int height
)
1172 struct drm_cmdline_mode
*cmdline_mode
;
1173 struct drm_display_mode
*mode
= NULL
;
1175 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
1176 if (cmdline_mode
->specified
== false)
1179 /* attempt to find a matching mode in the list of modes
1180 * we have gotten so far, if not add a CVT mode that conforms
1182 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1185 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1186 /* check width/height */
1187 if (mode
->hdisplay
!= cmdline_mode
->xres
||
1188 mode
->vdisplay
!= cmdline_mode
->yres
)
1191 if (cmdline_mode
->refresh_specified
) {
1192 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
1196 if (cmdline_mode
->interlace
) {
1197 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
1204 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
1206 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
1210 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
1215 enable
= connector
->status
== connector_status_connected
;
1217 enable
= connector
->status
!= connector_status_disconnected
;
1222 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
1225 bool any_enabled
= false;
1226 struct drm_connector
*connector
;
1229 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1230 connector
= fb_helper
->connector_info
[i
]->connector
;
1231 enabled
[i
] = drm_connector_enabled(connector
, true);
1232 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
1233 enabled
[i
] ? "yes" : "no");
1234 any_enabled
|= enabled
[i
];
1240 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1241 connector
= fb_helper
->connector_info
[i
]->connector
;
1242 enabled
[i
] = drm_connector_enabled(connector
, false);
1246 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
1247 struct drm_display_mode
**modes
,
1248 bool *enabled
, int width
, int height
)
1251 bool can_clone
= false;
1252 struct drm_fb_helper_connector
*fb_helper_conn
;
1253 struct drm_display_mode
*dmt_mode
, *mode
;
1255 /* only contemplate cloning in the single crtc case */
1256 if (fb_helper
->crtc_count
> 1)
1260 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1265 /* only contemplate cloning if more than one connector is enabled */
1269 /* check the command line or if nothing common pick 1024x768 */
1271 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1274 fb_helper_conn
= fb_helper
->connector_info
[i
];
1275 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1280 for (j
= 0; j
< i
; j
++) {
1283 if (!drm_mode_equal(modes
[j
], modes
[i
]))
1289 DRM_DEBUG_KMS("can clone using command line\n");
1293 /* try and find a 1024x768 mode on each connector */
1295 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
1297 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1302 fb_helper_conn
= fb_helper
->connector_info
[i
];
1303 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1304 if (drm_mode_equal(mode
, dmt_mode
))
1312 DRM_DEBUG_KMS("can clone using 1024x768\n");
1315 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1319 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
1320 struct drm_display_mode
**modes
,
1321 bool *enabled
, int width
, int height
)
1323 struct drm_fb_helper_connector
*fb_helper_conn
;
1326 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1327 fb_helper_conn
= fb_helper
->connector_info
[i
];
1329 if (enabled
[i
] == false)
1332 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1333 fb_helper_conn
->connector
->base
.id
);
1335 /* got for command line mode first */
1336 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1338 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1339 fb_helper_conn
->connector
->base
.id
);
1340 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
1342 /* No preferred modes, pick one off the list */
1343 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
1344 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
1347 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
1353 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
1354 struct drm_fb_helper_crtc
**best_crtcs
,
1355 struct drm_display_mode
**modes
,
1356 int n
, int width
, int height
)
1359 struct drm_device
*dev
= fb_helper
->dev
;
1360 struct drm_connector
*connector
;
1361 struct drm_connector_helper_funcs
*connector_funcs
;
1362 struct drm_encoder
*encoder
;
1363 struct drm_fb_helper_crtc
*best_crtc
;
1364 int my_score
, best_score
, score
;
1365 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
1366 struct drm_fb_helper_connector
*fb_helper_conn
;
1368 if (n
== fb_helper
->connector_count
)
1371 fb_helper_conn
= fb_helper
->connector_info
[n
];
1372 connector
= fb_helper_conn
->connector
;
1374 best_crtcs
[n
] = NULL
;
1376 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
1377 if (modes
[n
] == NULL
)
1380 crtcs
= kzalloc(dev
->mode_config
.num_connector
*
1381 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1386 if (connector
->status
== connector_status_connected
)
1388 if (drm_has_cmdline_mode(fb_helper_conn
))
1390 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
1393 connector_funcs
= connector
->helper_private
;
1394 encoder
= connector_funcs
->best_encoder(connector
);
1398 /* select a crtc for this connector and then attempt to configure
1399 remaining connectors */
1400 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
1401 crtc
= &fb_helper
->crtc_info
[c
];
1403 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
1406 for (o
= 0; o
< n
; o
++)
1407 if (best_crtcs
[o
] == crtc
)
1411 /* ignore cloning unless only a single crtc */
1412 if (fb_helper
->crtc_count
> 1)
1415 if (!drm_mode_equal(modes
[o
], modes
[n
]))
1420 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
1421 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
1423 if (score
> best_score
) {
1426 memcpy(best_crtcs
, crtcs
,
1427 dev
->mode_config
.num_connector
*
1428 sizeof(struct drm_fb_helper_crtc
*));
1436 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
)
1438 struct drm_device
*dev
= fb_helper
->dev
;
1439 struct drm_fb_helper_crtc
**crtcs
;
1440 struct drm_display_mode
**modes
;
1441 struct drm_mode_set
*modeset
;
1446 DRM_DEBUG_KMS("\n");
1448 width
= dev
->mode_config
.max_width
;
1449 height
= dev
->mode_config
.max_height
;
1451 crtcs
= kcalloc(dev
->mode_config
.num_connector
,
1452 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1453 modes
= kcalloc(dev
->mode_config
.num_connector
,
1454 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
1455 enabled
= kcalloc(dev
->mode_config
.num_connector
,
1456 sizeof(bool), GFP_KERNEL
);
1457 if (!crtcs
|| !modes
|| !enabled
) {
1458 DRM_ERROR("Memory allocation failed\n");
1463 drm_enable_connectors(fb_helper
, enabled
);
1465 if (!(fb_helper
->funcs
->initial_config
&&
1466 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
1467 enabled
, width
, height
))) {
1468 memset(modes
, 0, dev
->mode_config
.num_connector
*sizeof(modes
[0]));
1469 memset(crtcs
, 0, dev
->mode_config
.num_connector
*sizeof(crtcs
[0]));
1471 if (!drm_target_cloned(fb_helper
,
1472 modes
, enabled
, width
, height
) &&
1473 !drm_target_preferred(fb_helper
,
1474 modes
, enabled
, width
, height
))
1475 DRM_ERROR("Unable to find initial modes\n");
1477 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1480 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
1483 /* need to set the modesets up here for use later */
1484 /* fill out the connector<->crtc mappings into the modesets */
1485 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1486 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1487 modeset
->num_connectors
= 0;
1491 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1492 struct drm_display_mode
*mode
= modes
[i
];
1493 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
1494 modeset
= &fb_crtc
->mode_set
;
1496 if (mode
&& fb_crtc
) {
1497 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1498 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
);
1499 fb_crtc
->desired_mode
= mode
;
1501 drm_mode_destroy(dev
, modeset
->mode
);
1502 modeset
->mode
= drm_mode_duplicate(dev
,
1503 fb_crtc
->desired_mode
);
1504 modeset
->connectors
[modeset
->num_connectors
++] = fb_helper
->connector_info
[i
]->connector
;
1505 modeset
->fb
= fb_helper
->fb
;
1509 /* Clear out any old modes if there are no more connected outputs. */
1510 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1511 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1512 if (modeset
->num_connectors
== 0) {
1513 BUG_ON(modeset
->fb
);
1514 BUG_ON(modeset
->num_connectors
);
1516 drm_mode_destroy(dev
, modeset
->mode
);
1517 modeset
->mode
= NULL
;
1527 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1528 * @fb_helper: fb_helper device struct
1529 * @bpp_sel: bpp value to use for the framebuffer configuration
1531 * Scans the CRTCs and connectors and tries to put together an initial setup.
1532 * At the moment, this is a cloned configuration across all heads with
1533 * a new framebuffer object as the backing store.
1535 * Note that this also registers the fbdev and so allows userspace to call into
1536 * the driver through the fbdev interfaces.
1538 * This function will call down into the ->fb_probe callback to let
1539 * the driver allocate and initialize the fbdev info structure and the drm
1540 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1541 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1542 * values for the fbdev info structure.
1545 * Zero if everything went ok, nonzero otherwise.
1547 bool drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
1549 struct drm_device
*dev
= fb_helper
->dev
;
1552 drm_fb_helper_parse_command_line(fb_helper
);
1554 count
= drm_fb_helper_probe_connector_modes(fb_helper
,
1555 dev
->mode_config
.max_width
,
1556 dev
->mode_config
.max_height
);
1558 * we shouldn't end up with no modes here.
1561 dev_info(fb_helper
->dev
->dev
, "No connectors reported connected with modes\n");
1563 drm_setup_crtcs(fb_helper
);
1565 return drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
1567 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
1570 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1571 * probing all the outputs attached to the fb
1572 * @fb_helper: the drm_fb_helper
1574 * Scan the connectors attached to the fb_helper and try to put together a
1575 * setup after *notification of a change in output configuration.
1577 * Called at runtime, takes the mode config locks to be able to check/change the
1578 * modeset configuration. Must be run from process context (which usually means
1579 * either the output polling work or a work item launched from the driver's
1580 * hotplug interrupt).
1582 * Note that the driver must ensure that this is only called _after_ the fb has
1583 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1586 * 0 on success and a non-zero error code otherwise.
1588 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
1590 struct drm_device
*dev
= fb_helper
->dev
;
1592 u32 max_width
, max_height
, bpp_sel
;
1597 mutex_lock(&fb_helper
->dev
->mode_config
.mutex
);
1598 if (!drm_fb_helper_is_bound(fb_helper
)) {
1599 fb_helper
->delayed_hotplug
= true;
1600 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1603 DRM_DEBUG_KMS("\n");
1605 max_width
= fb_helper
->fb
->width
;
1606 max_height
= fb_helper
->fb
->height
;
1607 bpp_sel
= fb_helper
->fb
->bits_per_pixel
;
1609 count
= drm_fb_helper_probe_connector_modes(fb_helper
, max_width
,
1611 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1613 drm_modeset_lock_all(dev
);
1614 drm_setup_crtcs(fb_helper
);
1615 drm_modeset_unlock_all(dev
);
1616 drm_fb_helper_set_par(fb_helper
->fbdev
);
1620 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
1622 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1623 * but the module doesn't depend on any fb console symbols. At least
1624 * attempt to load fbcon to avoid leaving the system without a usable console.
1626 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1627 static int __init
drm_fb_helper_modinit(void)
1629 const char *name
= "fbcon";
1630 struct module
*fbcon
;
1632 mutex_lock(&module_mutex
);
1633 fbcon
= find_module(name
);
1634 mutex_unlock(&module_mutex
);
1637 request_module_nowait(name
);
1641 module_init(drm_fb_helper_modinit
);