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 independantely from the crtc
49 * helper functions used by many drivers to implement the kernel mode setting
52 * Initialization is done as a three-step process with drm_fb_helper_init(),
53 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
54 * Drivers with fancier requirements than the default beheviour can override the
55 * second step with their own code. Teardown is done with drm_fb_helper_fini().
57 * At runtime drivers should restore the fbdev console by calling
58 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
59 * should also notify the fb helper code from updates to the output
60 * configuration by calling drm_fb_helper_hotplug_event(). For easier
61 * integration with the output polling code in drm_crtc_helper.c the modeset
62 * code proves a ->output_poll_changed callback.
64 * All other functions exported by the fb helper library can be used to
65 * implement the fbdev driver interface by the driver.
69 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
71 * @fb_helper: fbdev initialized with drm_fb_helper_init
73 * This functions adds all the available connectors for use with the given
74 * fb_helper. This is a separate step to allow drivers to freely assign
75 * connectors to the fbdev, e.g. if some are reserved for special purposes or
76 * not adequate to be used for the fbcon.
78 * Since this is part of the initial setup before the fbdev is published, no
79 * locking is required.
81 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper
*fb_helper
)
83 struct drm_device
*dev
= fb_helper
->dev
;
84 struct drm_connector
*connector
;
87 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
88 struct drm_fb_helper_connector
*fb_helper_connector
;
90 fb_helper_connector
= kzalloc(sizeof(struct drm_fb_helper_connector
), GFP_KERNEL
);
91 if (!fb_helper_connector
)
94 fb_helper_connector
->connector
= connector
;
95 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_helper_connector
;
99 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
100 kfree(fb_helper
->connector_info
[i
]);
101 fb_helper
->connector_info
[i
] = NULL
;
103 fb_helper
->connector_count
= 0;
106 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors
);
108 static int drm_fb_helper_parse_command_line(struct drm_fb_helper
*fb_helper
)
110 struct drm_fb_helper_connector
*fb_helper_conn
;
113 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
114 struct drm_cmdline_mode
*mode
;
115 struct drm_connector
*connector
;
118 fb_helper_conn
= fb_helper
->connector_info
[i
];
119 connector
= fb_helper_conn
->connector
;
120 mode
= &fb_helper_conn
->cmdline_mode
;
122 /* do something on return - turn off connector maybe */
123 if (fb_get_options(drm_get_connector_name(connector
), &option
))
126 if (drm_mode_parse_command_line_for_connector(option
,
131 switch (mode
->force
) {
135 case DRM_FORCE_ON_DIGITAL
:
144 DRM_INFO("forcing %s connector %s\n",
145 drm_get_connector_name(connector
), s
);
146 connector
->force
= mode
->force
;
149 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
150 drm_get_connector_name(connector
),
151 mode
->xres
, mode
->yres
,
152 mode
->refresh_specified
? mode
->refresh
: 60,
153 mode
->rb
? " reduced blanking" : "",
154 mode
->margins
? " with margins" : "",
155 mode
->interlace
? " interlaced" : "");
162 static void drm_fb_helper_save_lut_atomic(struct drm_crtc
*crtc
, struct drm_fb_helper
*helper
)
164 uint16_t *r_base
, *g_base
, *b_base
;
167 if (helper
->funcs
->gamma_get
== NULL
)
170 r_base
= crtc
->gamma_store
;
171 g_base
= r_base
+ crtc
->gamma_size
;
172 b_base
= g_base
+ crtc
->gamma_size
;
174 for (i
= 0; i
< crtc
->gamma_size
; i
++)
175 helper
->funcs
->gamma_get(crtc
, &r_base
[i
], &g_base
[i
], &b_base
[i
], i
);
178 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc
*crtc
)
180 uint16_t *r_base
, *g_base
, *b_base
;
182 if (crtc
->funcs
->gamma_set
== NULL
)
185 r_base
= crtc
->gamma_store
;
186 g_base
= r_base
+ crtc
->gamma_size
;
187 b_base
= g_base
+ crtc
->gamma_size
;
189 crtc
->funcs
->gamma_set(crtc
, r_base
, g_base
, b_base
, 0, crtc
->gamma_size
);
193 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
194 * @info: fbdev registered by the helper
196 int drm_fb_helper_debug_enter(struct fb_info
*info
)
198 struct drm_fb_helper
*helper
= info
->par
;
199 struct drm_crtc_helper_funcs
*funcs
;
202 if (list_empty(&kernel_fb_helper_list
))
205 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
206 for (i
= 0; i
< helper
->crtc_count
; i
++) {
207 struct drm_mode_set
*mode_set
=
208 &helper
->crtc_info
[i
].mode_set
;
210 if (!mode_set
->crtc
->enabled
)
213 funcs
= mode_set
->crtc
->helper_private
;
214 drm_fb_helper_save_lut_atomic(mode_set
->crtc
, helper
);
215 funcs
->mode_set_base_atomic(mode_set
->crtc
,
219 ENTER_ATOMIC_MODE_SET
);
225 EXPORT_SYMBOL(drm_fb_helper_debug_enter
);
227 /* Find the real fb for a given fb helper CRTC */
228 static struct drm_framebuffer
*drm_mode_config_fb(struct drm_crtc
*crtc
)
230 struct drm_device
*dev
= crtc
->dev
;
233 list_for_each_entry(c
, &dev
->mode_config
.crtc_list
, head
) {
234 if (crtc
->base
.id
== c
->base
.id
)
242 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
243 * @info: fbdev registered by the helper
245 int drm_fb_helper_debug_leave(struct fb_info
*info
)
247 struct drm_fb_helper
*helper
= info
->par
;
248 struct drm_crtc
*crtc
;
249 struct drm_crtc_helper_funcs
*funcs
;
250 struct drm_framebuffer
*fb
;
253 for (i
= 0; i
< helper
->crtc_count
; i
++) {
254 struct drm_mode_set
*mode_set
= &helper
->crtc_info
[i
].mode_set
;
255 crtc
= mode_set
->crtc
;
256 funcs
= crtc
->helper_private
;
257 fb
= drm_mode_config_fb(crtc
);
263 DRM_ERROR("no fb to restore??\n");
267 drm_fb_helper_restore_lut_atomic(mode_set
->crtc
);
268 funcs
->mode_set_base_atomic(mode_set
->crtc
, fb
, crtc
->x
,
269 crtc
->y
, LEAVE_ATOMIC_MODE_SET
);
274 EXPORT_SYMBOL(drm_fb_helper_debug_leave
);
277 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
278 * @fb_helper: fbcon to restore
280 * This should be called from driver's drm ->lastclose callback
281 * when implementing an fbcon on top of kms using this helper. This ensures that
282 * the user isn't greeted with a black screen when e.g. X dies.
284 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
286 struct drm_device
*dev
= fb_helper
->dev
;
287 struct drm_plane
*plane
;
291 drm_warn_on_modeset_not_all_locked(dev
);
293 list_for_each_entry(plane
, &dev
->mode_config
.plane_list
, head
)
294 drm_plane_force_disable(plane
);
296 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
297 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
298 struct drm_crtc
*crtc
= mode_set
->crtc
;
301 if (crtc
->funcs
->cursor_set
) {
302 ret
= crtc
->funcs
->cursor_set(crtc
, NULL
, 0, 0, 0);
307 ret
= drm_mode_set_config_internal(mode_set
);
313 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode
);
316 * restore fbcon display for all kms driver's using this helper, used for sysrq
317 * and panic handling.
319 static bool drm_fb_helper_force_kernel_mode(void)
321 bool ret
, error
= false;
322 struct drm_fb_helper
*helper
;
324 if (list_empty(&kernel_fb_helper_list
))
327 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
328 if (helper
->dev
->switch_power_state
== DRM_SWITCH_POWER_OFF
)
331 ret
= drm_fb_helper_restore_fbdev_mode(helper
);
338 static int drm_fb_helper_panic(struct notifier_block
*n
, unsigned long ununsed
,
342 * It's a waste of time and effort to switch back to text console
343 * if the kernel should reboot before panic messages can be seen.
345 if (panic_timeout
< 0)
348 pr_err("panic occurred, switching back to text console\n");
349 return drm_fb_helper_force_kernel_mode();
352 static struct notifier_block paniced
= {
353 .notifier_call
= drm_fb_helper_panic
,
356 static bool drm_fb_helper_is_bound(struct drm_fb_helper
*fb_helper
)
358 struct drm_device
*dev
= fb_helper
->dev
;
359 struct drm_crtc
*crtc
;
360 int bound
= 0, crtcs_bound
= 0;
362 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
365 if (crtc
->fb
== fb_helper
->fb
)
369 if (bound
< crtcs_bound
)
374 #ifdef CONFIG_MAGIC_SYSRQ
375 static void drm_fb_helper_restore_work_fn(struct work_struct
*ignored
)
378 ret
= drm_fb_helper_force_kernel_mode();
380 DRM_ERROR("Failed to restore crtc configuration\n");
382 static DECLARE_WORK(drm_fb_helper_restore_work
, drm_fb_helper_restore_work_fn
);
384 static void drm_fb_helper_sysrq(int dummy1
)
386 schedule_work(&drm_fb_helper_restore_work
);
389 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
390 .handler
= drm_fb_helper_sysrq
,
391 .help_msg
= "force-fb(V)",
392 .action_msg
= "Restore framebuffer console",
395 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= { };
398 static void drm_fb_helper_dpms(struct fb_info
*info
, int dpms_mode
)
400 struct drm_fb_helper
*fb_helper
= info
->par
;
401 struct drm_device
*dev
= fb_helper
->dev
;
402 struct drm_crtc
*crtc
;
403 struct drm_connector
*connector
;
407 * fbdev->blank can be called from irq context in case of a panic.
408 * Since we already have our own special panic handler which will
409 * restore the fbdev console mode completely, just bail out early.
411 if (oops_in_progress
)
415 * For each CRTC in this fb, turn the connectors on/off.
417 drm_modeset_lock_all(dev
);
418 if (!drm_fb_helper_is_bound(fb_helper
)) {
419 drm_modeset_unlock_all(dev
);
423 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
424 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
429 /* Walk the connectors & encoders on this fb turning them on/off */
430 for (j
= 0; j
< fb_helper
->connector_count
; j
++) {
431 connector
= fb_helper
->connector_info
[j
]->connector
;
432 connector
->funcs
->dpms(connector
, dpms_mode
);
433 drm_object_property_set_value(&connector
->base
,
434 dev
->mode_config
.dpms_property
, dpms_mode
);
437 drm_modeset_unlock_all(dev
);
441 * drm_fb_helper_blank - implementation for ->fb_blank
442 * @blank: desired blanking state
443 * @info: fbdev registered by the helper
445 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
448 /* Display: On; HSync: On, VSync: On */
449 case FB_BLANK_UNBLANK
:
450 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
452 /* Display: Off; HSync: On, VSync: On */
453 case FB_BLANK_NORMAL
:
454 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
456 /* Display: Off; HSync: Off, VSync: On */
457 case FB_BLANK_HSYNC_SUSPEND
:
458 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
460 /* Display: Off; HSync: On, VSync: Off */
461 case FB_BLANK_VSYNC_SUSPEND
:
462 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
464 /* Display: Off; HSync: Off, VSync: Off */
465 case FB_BLANK_POWERDOWN
:
466 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
471 EXPORT_SYMBOL(drm_fb_helper_blank
);
473 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
477 for (i
= 0; i
< helper
->connector_count
; i
++)
478 kfree(helper
->connector_info
[i
]);
479 kfree(helper
->connector_info
);
480 for (i
= 0; i
< helper
->crtc_count
; i
++) {
481 kfree(helper
->crtc_info
[i
].mode_set
.connectors
);
482 if (helper
->crtc_info
[i
].mode_set
.mode
)
483 drm_mode_destroy(helper
->dev
, helper
->crtc_info
[i
].mode_set
.mode
);
485 kfree(helper
->crtc_info
);
489 * drm_fb_helper_init - initialize a drm_fb_helper structure
491 * @fb_helper: driver-allocated fbdev helper structure to initialize
492 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
493 * @max_conn_count: max connector count
495 * This allocates the structures for the fbdev helper with the given limits.
496 * Note that this won't yet touch the hardware (through the driver interfaces)
497 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
498 * to allow driver writes more control over the exact init sequence.
500 * Drivers must set fb_helper->funcs before calling
501 * drm_fb_helper_initial_config().
504 * Zero if everything went ok, nonzero otherwise.
506 int drm_fb_helper_init(struct drm_device
*dev
,
507 struct drm_fb_helper
*fb_helper
,
508 int crtc_count
, int max_conn_count
)
510 struct drm_crtc
*crtc
;
513 fb_helper
->dev
= dev
;
515 INIT_LIST_HEAD(&fb_helper
->kernel_fb_list
);
517 fb_helper
->crtc_info
= kcalloc(crtc_count
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
518 if (!fb_helper
->crtc_info
)
521 fb_helper
->crtc_count
= crtc_count
;
522 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
523 if (!fb_helper
->connector_info
) {
524 kfree(fb_helper
->crtc_info
);
527 fb_helper
->connector_count
= 0;
529 for (i
= 0; i
< crtc_count
; i
++) {
530 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
531 kcalloc(max_conn_count
,
532 sizeof(struct drm_connector
*),
535 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
537 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
541 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
542 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
548 drm_fb_helper_crtc_free(fb_helper
);
551 EXPORT_SYMBOL(drm_fb_helper_init
);
553 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
555 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
556 list_del(&fb_helper
->kernel_fb_list
);
557 if (list_empty(&kernel_fb_helper_list
)) {
558 pr_info("drm: unregistered panic notifier\n");
559 atomic_notifier_chain_unregister(&panic_notifier_list
,
561 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
565 drm_fb_helper_crtc_free(fb_helper
);
568 EXPORT_SYMBOL(drm_fb_helper_fini
);
570 static int setcolreg(struct drm_crtc
*crtc
, u16 red
, u16 green
,
571 u16 blue
, u16 regno
, struct fb_info
*info
)
573 struct drm_fb_helper
*fb_helper
= info
->par
;
574 struct drm_framebuffer
*fb
= fb_helper
->fb
;
577 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
) {
580 /* place color in psuedopalette */
583 palette
= (u32
*)info
->pseudo_palette
;
584 red
>>= (16 - info
->var
.red
.length
);
585 green
>>= (16 - info
->var
.green
.length
);
586 blue
>>= (16 - info
->var
.blue
.length
);
587 value
= (red
<< info
->var
.red
.offset
) |
588 (green
<< info
->var
.green
.offset
) |
589 (blue
<< info
->var
.blue
.offset
);
590 if (info
->var
.transp
.length
> 0) {
591 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
592 mask
<<= info
->var
.transp
.offset
;
595 palette
[regno
] = value
;
600 * The driver really shouldn't advertise pseudo/directcolor
601 * visuals if it can't deal with the palette.
603 if (WARN_ON(!fb_helper
->funcs
->gamma_set
||
604 !fb_helper
->funcs
->gamma_get
))
609 if (fb
->bits_per_pixel
== 16) {
612 if (fb
->depth
== 16 && regno
> 63)
614 if (fb
->depth
== 15 && regno
> 31)
617 if (fb
->depth
== 16) {
621 for (i
= 0; i
< 8; i
++)
622 fb_helper
->funcs
->gamma_set(crtc
, red
,
623 green
, blue
, pindex
+ i
);
626 fb_helper
->funcs
->gamma_get(crtc
, &r
,
630 for (i
= 0; i
< 4; i
++)
631 fb_helper
->funcs
->gamma_set(crtc
, r
,
638 fb_helper
->funcs
->gamma_set(crtc
, red
, green
, blue
, pindex
);
643 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
645 * @info: fbdev registered by the helper
647 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
649 struct drm_fb_helper
*fb_helper
= info
->par
;
650 struct drm_device
*dev
= fb_helper
->dev
;
651 struct drm_crtc_helper_funcs
*crtc_funcs
;
652 u16
*red
, *green
, *blue
, *transp
;
653 struct drm_crtc
*crtc
;
657 drm_modeset_lock_all(dev
);
658 if (!drm_fb_helper_is_bound(fb_helper
)) {
659 drm_modeset_unlock_all(dev
);
663 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
664 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
665 crtc_funcs
= crtc
->helper_private
;
670 transp
= cmap
->transp
;
673 for (j
= 0; j
< cmap
->len
; j
++) {
674 u16 hred
, hgreen
, hblue
, htransp
= 0xffff;
683 rc
= setcolreg(crtc
, hred
, hgreen
, hblue
, start
++, info
);
687 if (crtc_funcs
->load_lut
)
688 crtc_funcs
->load_lut(crtc
);
691 drm_modeset_unlock_all(dev
);
694 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
697 * drm_fb_helper_check_var - implementation for ->fb_check_var
698 * @var: screeninfo to check
699 * @info: fbdev registered by the helper
701 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
702 struct fb_info
*info
)
704 struct drm_fb_helper
*fb_helper
= info
->par
;
705 struct drm_framebuffer
*fb
= fb_helper
->fb
;
708 if (var
->pixclock
!= 0 || in_dbg_master())
711 /* Need to resize the fb object !!! */
712 if (var
->bits_per_pixel
> fb
->bits_per_pixel
||
713 var
->xres
> fb
->width
|| var
->yres
> fb
->height
||
714 var
->xres_virtual
> fb
->width
|| var
->yres_virtual
> fb
->height
) {
715 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
716 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
717 var
->xres
, var
->yres
, var
->bits_per_pixel
,
718 var
->xres_virtual
, var
->yres_virtual
,
719 fb
->width
, fb
->height
, fb
->bits_per_pixel
);
723 switch (var
->bits_per_pixel
) {
725 depth
= (var
->green
.length
== 6) ? 16 : 15;
728 depth
= (var
->transp
.length
> 0) ? 32 : 24;
731 depth
= var
->bits_per_pixel
;
738 var
->green
.offset
= 0;
739 var
->blue
.offset
= 0;
741 var
->green
.length
= 8;
742 var
->blue
.length
= 8;
743 var
->transp
.length
= 0;
744 var
->transp
.offset
= 0;
747 var
->red
.offset
= 10;
748 var
->green
.offset
= 5;
749 var
->blue
.offset
= 0;
751 var
->green
.length
= 5;
752 var
->blue
.length
= 5;
753 var
->transp
.length
= 1;
754 var
->transp
.offset
= 15;
757 var
->red
.offset
= 11;
758 var
->green
.offset
= 5;
759 var
->blue
.offset
= 0;
761 var
->green
.length
= 6;
762 var
->blue
.length
= 5;
763 var
->transp
.length
= 0;
764 var
->transp
.offset
= 0;
767 var
->red
.offset
= 16;
768 var
->green
.offset
= 8;
769 var
->blue
.offset
= 0;
771 var
->green
.length
= 8;
772 var
->blue
.length
= 8;
773 var
->transp
.length
= 0;
774 var
->transp
.offset
= 0;
777 var
->red
.offset
= 16;
778 var
->green
.offset
= 8;
779 var
->blue
.offset
= 0;
781 var
->green
.length
= 8;
782 var
->blue
.length
= 8;
783 var
->transp
.length
= 8;
784 var
->transp
.offset
= 24;
791 EXPORT_SYMBOL(drm_fb_helper_check_var
);
794 * drm_fb_helper_set_par - implementation for ->fb_set_par
795 * @info: fbdev registered by the helper
797 * This will let fbcon do the mode init and is called at initialization time by
798 * the fbdev core when registering the driver, and later on through the hotplug
801 int drm_fb_helper_set_par(struct fb_info
*info
)
803 struct drm_fb_helper
*fb_helper
= info
->par
;
804 struct drm_device
*dev
= fb_helper
->dev
;
805 struct fb_var_screeninfo
*var
= &info
->var
;
809 if (var
->pixclock
!= 0) {
810 DRM_ERROR("PIXEL CLOCK SET\n");
814 drm_modeset_lock_all(dev
);
815 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
816 ret
= drm_mode_set_config_internal(&fb_helper
->crtc_info
[i
].mode_set
);
818 drm_modeset_unlock_all(dev
);
822 drm_modeset_unlock_all(dev
);
824 if (fb_helper
->delayed_hotplug
) {
825 fb_helper
->delayed_hotplug
= false;
826 drm_fb_helper_hotplug_event(fb_helper
);
830 EXPORT_SYMBOL(drm_fb_helper_set_par
);
833 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
834 * @var: updated screen information
835 * @info: fbdev registered by the helper
837 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
838 struct fb_info
*info
)
840 struct drm_fb_helper
*fb_helper
= info
->par
;
841 struct drm_device
*dev
= fb_helper
->dev
;
842 struct drm_mode_set
*modeset
;
846 drm_modeset_lock_all(dev
);
847 if (!drm_fb_helper_is_bound(fb_helper
)) {
848 drm_modeset_unlock_all(dev
);
852 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
853 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
855 modeset
->x
= var
->xoffset
;
856 modeset
->y
= var
->yoffset
;
858 if (modeset
->num_connectors
) {
859 ret
= drm_mode_set_config_internal(modeset
);
861 info
->var
.xoffset
= var
->xoffset
;
862 info
->var
.yoffset
= var
->yoffset
;
866 drm_modeset_unlock_all(dev
);
869 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
872 * Allocates the backing storage and sets up the fbdev info structure through
873 * the ->fb_probe callback and then registers the fbdev and sets up the panic
876 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
882 struct fb_info
*info
;
883 struct drm_fb_helper_surface_size sizes
;
886 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
887 sizes
.surface_depth
= 24;
888 sizes
.surface_bpp
= 32;
889 sizes
.fb_width
= (unsigned)-1;
890 sizes
.fb_height
= (unsigned)-1;
892 /* if driver picks 8 or 16 by default use that
893 for both depth/bpp */
894 if (preferred_bpp
!= sizes
.surface_bpp
)
895 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
897 /* first up get a count of crtcs now in use and new min/maxes width/heights */
898 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
899 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
900 struct drm_cmdline_mode
*cmdline_mode
;
902 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
904 if (cmdline_mode
->bpp_specified
) {
905 switch (cmdline_mode
->bpp
) {
907 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
910 sizes
.surface_depth
= 15;
911 sizes
.surface_bpp
= 16;
914 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
917 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
920 sizes
.surface_depth
= 24;
921 sizes
.surface_bpp
= 32;
929 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
930 struct drm_display_mode
*desired_mode
;
931 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
935 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
936 if (desired_mode
->hdisplay
< sizes
.fb_width
)
937 sizes
.fb_width
= desired_mode
->hdisplay
;
938 if (desired_mode
->vdisplay
< sizes
.fb_height
)
939 sizes
.fb_height
= desired_mode
->vdisplay
;
940 if (desired_mode
->hdisplay
> sizes
.surface_width
)
941 sizes
.surface_width
= desired_mode
->hdisplay
;
942 if (desired_mode
->vdisplay
> sizes
.surface_height
)
943 sizes
.surface_height
= desired_mode
->vdisplay
;
948 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
949 /* hmm everyone went away - assume VGA cable just fell out
950 and will come back later. */
951 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
952 sizes
.fb_width
= sizes
.surface_width
= 1024;
953 sizes
.fb_height
= sizes
.surface_height
= 768;
956 /* push down into drivers */
957 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
961 info
= fb_helper
->fbdev
;
964 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
965 * events, but at init time drm_setup_crtcs needs to be called before
966 * the fb is allocated (since we need to figure out the desired size of
967 * the fb before we can allocate it ...). Hence we need to fix things up
970 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
971 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
972 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
975 info
->var
.pixclock
= 0;
976 if (register_framebuffer(info
) < 0)
979 dev_info(fb_helper
->dev
->dev
, "fb%d: %s frame buffer device\n",
980 info
->node
, info
->fix
.id
);
982 /* Switch back to kernel console on panic */
983 /* multi card linked list maybe */
984 if (list_empty(&kernel_fb_helper_list
)) {
985 dev_info(fb_helper
->dev
->dev
, "registered panic notifier\n");
986 atomic_notifier_chain_register(&panic_notifier_list
,
988 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
991 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
997 * drm_fb_helper_fill_fix - initializes fixed fbdev information
998 * @info: fbdev registered by the helper
999 * @pitch: desired pitch
1000 * @depth: desired depth
1002 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1003 * fbdev emulations. Drivers which support acceleration methods which impose
1004 * additional constraints need to set up their own limits.
1006 * Drivers should call this (or their equivalent setup code) from their
1007 * ->fb_probe callback.
1009 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1012 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1013 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1014 FB_VISUAL_TRUECOLOR
;
1015 info
->fix
.mmio_start
= 0;
1016 info
->fix
.mmio_len
= 0;
1017 info
->fix
.type_aux
= 0;
1018 info
->fix
.xpanstep
= 1; /* doing it in hw */
1019 info
->fix
.ypanstep
= 1; /* doing it in hw */
1020 info
->fix
.ywrapstep
= 0;
1021 info
->fix
.accel
= FB_ACCEL_NONE
;
1022 info
->fix
.type_aux
= 0;
1024 info
->fix
.line_length
= pitch
;
1027 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1030 * drm_fb_helper_fill_var - initalizes variable fbdev information
1031 * @info: fbdev instance to set up
1032 * @fb_helper: fb helper instance to use as template
1033 * @fb_width: desired fb width
1034 * @fb_height: desired fb height
1036 * Sets up the variable fbdev metainformation from the given fb helper instance
1037 * and the drm framebuffer allocated in fb_helper->fb.
1039 * Drivers should call this (or their equivalent setup code) from their
1040 * ->fb_probe callback after having allocated the fbdev backing
1041 * storage framebuffer.
1043 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1044 uint32_t fb_width
, uint32_t fb_height
)
1046 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1047 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1048 info
->var
.xres_virtual
= fb
->width
;
1049 info
->var
.yres_virtual
= fb
->height
;
1050 info
->var
.bits_per_pixel
= fb
->bits_per_pixel
;
1051 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1052 info
->var
.xoffset
= 0;
1053 info
->var
.yoffset
= 0;
1054 info
->var
.activate
= FB_ACTIVATE_NOW
;
1055 info
->var
.height
= -1;
1056 info
->var
.width
= -1;
1058 switch (fb
->depth
) {
1060 info
->var
.red
.offset
= 0;
1061 info
->var
.green
.offset
= 0;
1062 info
->var
.blue
.offset
= 0;
1063 info
->var
.red
.length
= 8; /* 8bit DAC */
1064 info
->var
.green
.length
= 8;
1065 info
->var
.blue
.length
= 8;
1066 info
->var
.transp
.offset
= 0;
1067 info
->var
.transp
.length
= 0;
1070 info
->var
.red
.offset
= 10;
1071 info
->var
.green
.offset
= 5;
1072 info
->var
.blue
.offset
= 0;
1073 info
->var
.red
.length
= 5;
1074 info
->var
.green
.length
= 5;
1075 info
->var
.blue
.length
= 5;
1076 info
->var
.transp
.offset
= 15;
1077 info
->var
.transp
.length
= 1;
1080 info
->var
.red
.offset
= 11;
1081 info
->var
.green
.offset
= 5;
1082 info
->var
.blue
.offset
= 0;
1083 info
->var
.red
.length
= 5;
1084 info
->var
.green
.length
= 6;
1085 info
->var
.blue
.length
= 5;
1086 info
->var
.transp
.offset
= 0;
1089 info
->var
.red
.offset
= 16;
1090 info
->var
.green
.offset
= 8;
1091 info
->var
.blue
.offset
= 0;
1092 info
->var
.red
.length
= 8;
1093 info
->var
.green
.length
= 8;
1094 info
->var
.blue
.length
= 8;
1095 info
->var
.transp
.offset
= 0;
1096 info
->var
.transp
.length
= 0;
1099 info
->var
.red
.offset
= 16;
1100 info
->var
.green
.offset
= 8;
1101 info
->var
.blue
.offset
= 0;
1102 info
->var
.red
.length
= 8;
1103 info
->var
.green
.length
= 8;
1104 info
->var
.blue
.length
= 8;
1105 info
->var
.transp
.offset
= 24;
1106 info
->var
.transp
.length
= 8;
1112 info
->var
.xres
= fb_width
;
1113 info
->var
.yres
= fb_height
;
1115 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1117 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1121 struct drm_connector
*connector
;
1125 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1126 connector
= fb_helper
->connector_info
[i
]->connector
;
1127 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1133 static struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1135 struct drm_display_mode
*mode
;
1137 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1138 if (drm_mode_width(mode
) > width
||
1139 drm_mode_height(mode
) > height
)
1141 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1147 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1149 struct drm_cmdline_mode
*cmdline_mode
;
1150 cmdline_mode
= &fb_connector
->cmdline_mode
;
1151 return cmdline_mode
->specified
;
1154 static struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
,
1155 int width
, int height
)
1157 struct drm_cmdline_mode
*cmdline_mode
;
1158 struct drm_display_mode
*mode
= NULL
;
1160 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
1161 if (cmdline_mode
->specified
== false)
1164 /* attempt to find a matching mode in the list of modes
1165 * we have gotten so far, if not add a CVT mode that conforms
1167 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1170 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1171 /* check width/height */
1172 if (mode
->hdisplay
!= cmdline_mode
->xres
||
1173 mode
->vdisplay
!= cmdline_mode
->yres
)
1176 if (cmdline_mode
->refresh_specified
) {
1177 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
1181 if (cmdline_mode
->interlace
) {
1182 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
1189 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
1191 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
1195 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
1200 enable
= connector
->status
== connector_status_connected
;
1202 enable
= connector
->status
!= connector_status_disconnected
;
1207 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
1210 bool any_enabled
= false;
1211 struct drm_connector
*connector
;
1214 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1215 connector
= fb_helper
->connector_info
[i
]->connector
;
1216 enabled
[i
] = drm_connector_enabled(connector
, true);
1217 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
1218 enabled
[i
] ? "yes" : "no");
1219 any_enabled
|= enabled
[i
];
1225 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1226 connector
= fb_helper
->connector_info
[i
]->connector
;
1227 enabled
[i
] = drm_connector_enabled(connector
, false);
1231 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
1232 struct drm_display_mode
**modes
,
1233 bool *enabled
, int width
, int height
)
1236 bool can_clone
= false;
1237 struct drm_fb_helper_connector
*fb_helper_conn
;
1238 struct drm_display_mode
*dmt_mode
, *mode
;
1240 /* only contemplate cloning in the single crtc case */
1241 if (fb_helper
->crtc_count
> 1)
1245 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1250 /* only contemplate cloning if more than one connector is enabled */
1254 /* check the command line or if nothing common pick 1024x768 */
1256 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1259 fb_helper_conn
= fb_helper
->connector_info
[i
];
1260 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1265 for (j
= 0; j
< i
; j
++) {
1268 if (!drm_mode_equal(modes
[j
], modes
[i
]))
1274 DRM_DEBUG_KMS("can clone using command line\n");
1278 /* try and find a 1024x768 mode on each connector */
1280 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
1282 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1287 fb_helper_conn
= fb_helper
->connector_info
[i
];
1288 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1289 if (drm_mode_equal(mode
, dmt_mode
))
1297 DRM_DEBUG_KMS("can clone using 1024x768\n");
1300 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1304 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
1305 struct drm_display_mode
**modes
,
1306 bool *enabled
, int width
, int height
)
1308 struct drm_fb_helper_connector
*fb_helper_conn
;
1311 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1312 fb_helper_conn
= fb_helper
->connector_info
[i
];
1314 if (enabled
[i
] == false)
1317 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1318 fb_helper_conn
->connector
->base
.id
);
1320 /* got for command line mode first */
1321 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1323 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1324 fb_helper_conn
->connector
->base
.id
);
1325 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
1327 /* No preferred modes, pick one off the list */
1328 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
1329 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
1332 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
1338 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
1339 struct drm_fb_helper_crtc
**best_crtcs
,
1340 struct drm_display_mode
**modes
,
1341 int n
, int width
, int height
)
1344 struct drm_device
*dev
= fb_helper
->dev
;
1345 struct drm_connector
*connector
;
1346 struct drm_connector_helper_funcs
*connector_funcs
;
1347 struct drm_encoder
*encoder
;
1348 int my_score
, best_score
, score
;
1349 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
1350 struct drm_fb_helper_connector
*fb_helper_conn
;
1352 if (n
== fb_helper
->connector_count
)
1355 fb_helper_conn
= fb_helper
->connector_info
[n
];
1356 connector
= fb_helper_conn
->connector
;
1358 best_crtcs
[n
] = NULL
;
1359 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
1360 if (modes
[n
] == NULL
)
1363 crtcs
= kzalloc(dev
->mode_config
.num_connector
*
1364 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1369 if (connector
->status
== connector_status_connected
)
1371 if (drm_has_cmdline_mode(fb_helper_conn
))
1373 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
1376 connector_funcs
= connector
->helper_private
;
1377 encoder
= connector_funcs
->best_encoder(connector
);
1381 /* select a crtc for this connector and then attempt to configure
1382 remaining connectors */
1383 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
1384 crtc
= &fb_helper
->crtc_info
[c
];
1386 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
1389 for (o
= 0; o
< n
; o
++)
1390 if (best_crtcs
[o
] == crtc
)
1394 /* ignore cloning unless only a single crtc */
1395 if (fb_helper
->crtc_count
> 1)
1398 if (!drm_mode_equal(modes
[o
], modes
[n
]))
1403 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
1404 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
1406 if (score
> best_score
) {
1408 memcpy(best_crtcs
, crtcs
,
1409 dev
->mode_config
.num_connector
*
1410 sizeof(struct drm_fb_helper_crtc
*));
1418 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
)
1420 struct drm_device
*dev
= fb_helper
->dev
;
1421 struct drm_fb_helper_crtc
**crtcs
;
1422 struct drm_display_mode
**modes
;
1423 struct drm_mode_set
*modeset
;
1428 DRM_DEBUG_KMS("\n");
1430 width
= dev
->mode_config
.max_width
;
1431 height
= dev
->mode_config
.max_height
;
1433 crtcs
= kcalloc(dev
->mode_config
.num_connector
,
1434 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1435 modes
= kcalloc(dev
->mode_config
.num_connector
,
1436 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
1437 enabled
= kcalloc(dev
->mode_config
.num_connector
,
1438 sizeof(bool), GFP_KERNEL
);
1439 if (!crtcs
|| !modes
|| !enabled
) {
1440 DRM_ERROR("Memory allocation failed\n");
1445 drm_enable_connectors(fb_helper
, enabled
);
1447 if (!(fb_helper
->funcs
->initial_config
&&
1448 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
1449 enabled
, width
, height
))) {
1450 memset(modes
, 0, dev
->mode_config
.num_connector
*sizeof(modes
[0]));
1451 memset(crtcs
, 0, dev
->mode_config
.num_connector
*sizeof(crtcs
[0]));
1453 if (!drm_target_cloned(fb_helper
,
1454 modes
, enabled
, width
, height
) &&
1455 !drm_target_preferred(fb_helper
,
1456 modes
, enabled
, width
, height
))
1457 DRM_ERROR("Unable to find initial modes\n");
1459 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1462 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
1465 /* need to set the modesets up here for use later */
1466 /* fill out the connector<->crtc mappings into the modesets */
1467 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1468 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1469 modeset
->num_connectors
= 0;
1473 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1474 struct drm_display_mode
*mode
= modes
[i
];
1475 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
1476 modeset
= &fb_crtc
->mode_set
;
1478 if (mode
&& fb_crtc
) {
1479 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1480 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
);
1481 fb_crtc
->desired_mode
= mode
;
1483 drm_mode_destroy(dev
, modeset
->mode
);
1484 modeset
->mode
= drm_mode_duplicate(dev
,
1485 fb_crtc
->desired_mode
);
1486 modeset
->connectors
[modeset
->num_connectors
++] = fb_helper
->connector_info
[i
]->connector
;
1487 modeset
->fb
= fb_helper
->fb
;
1491 /* Clear out any old modes if there are no more connected outputs. */
1492 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1493 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1494 if (modeset
->num_connectors
== 0) {
1495 BUG_ON(modeset
->fb
);
1496 BUG_ON(modeset
->num_connectors
);
1498 drm_mode_destroy(dev
, modeset
->mode
);
1499 modeset
->mode
= NULL
;
1509 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1510 * @fb_helper: fb_helper device struct
1511 * @bpp_sel: bpp value to use for the framebuffer configuration
1513 * Scans the CRTCs and connectors and tries to put together an initial setup.
1514 * At the moment, this is a cloned configuration across all heads with
1515 * a new framebuffer object as the backing store.
1517 * Note that this also registers the fbdev and so allows userspace to call into
1518 * the driver through the fbdev interfaces.
1520 * This function will call down into the ->fb_probe callback to let
1521 * the driver allocate and initialize the fbdev info structure and the drm
1522 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1523 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1524 * values for the fbdev info structure.
1527 * Zero if everything went ok, nonzero otherwise.
1529 bool drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
1531 struct drm_device
*dev
= fb_helper
->dev
;
1534 drm_fb_helper_parse_command_line(fb_helper
);
1536 count
= drm_fb_helper_probe_connector_modes(fb_helper
,
1537 dev
->mode_config
.max_width
,
1538 dev
->mode_config
.max_height
);
1540 * we shouldn't end up with no modes here.
1543 dev_info(fb_helper
->dev
->dev
, "No connectors reported connected with modes\n");
1545 drm_setup_crtcs(fb_helper
);
1547 return drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
1549 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
1552 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1553 * probing all the outputs attached to the fb
1554 * @fb_helper: the drm_fb_helper
1556 * Scan the connectors attached to the fb_helper and try to put together a
1557 * setup after *notification of a change in output configuration.
1559 * Called at runtime, takes the mode config locks to be able to check/change the
1560 * modeset configuration. Must be run from process context (which usually means
1561 * either the output polling work or a work item launched from the driver's
1562 * hotplug interrupt).
1564 * Note that the driver must ensure that this is only called _after_ the fb has
1565 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1568 * 0 on success and a non-zero error code otherwise.
1570 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
1572 struct drm_device
*dev
= fb_helper
->dev
;
1573 u32 max_width
, max_height
;
1578 mutex_lock(&fb_helper
->dev
->mode_config
.mutex
);
1579 if (!drm_fb_helper_is_bound(fb_helper
)) {
1580 fb_helper
->delayed_hotplug
= true;
1581 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1584 DRM_DEBUG_KMS("\n");
1586 max_width
= fb_helper
->fb
->width
;
1587 max_height
= fb_helper
->fb
->height
;
1589 drm_fb_helper_probe_connector_modes(fb_helper
, max_width
, max_height
);
1590 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1592 drm_modeset_lock_all(dev
);
1593 drm_setup_crtcs(fb_helper
);
1594 drm_modeset_unlock_all(dev
);
1595 drm_fb_helper_set_par(fb_helper
->fbdev
);
1599 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
1601 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1602 * but the module doesn't depend on any fb console symbols. At least
1603 * attempt to load fbcon to avoid leaving the system without a usable console.
1605 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1606 static int __init
drm_fb_helper_modinit(void)
1608 const char *name
= "fbcon";
1609 struct module
*fbcon
;
1611 mutex_lock(&module_mutex
);
1612 fbcon
= find_module(name
);
1613 mutex_unlock(&module_mutex
);
1616 request_module_nowait(name
);
1620 module_init(drm_fb_helper_modinit
);