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 * For each CRTC in this fb, turn the connectors on/off.
421 drm_modeset_lock_all(dev
);
422 if (!drm_fb_helper_is_bound(fb_helper
)) {
423 drm_modeset_unlock_all(dev
);
427 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
428 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
433 /* Walk the connectors & encoders on this fb turning them on/off */
434 for (j
= 0; j
< fb_helper
->connector_count
; j
++) {
435 connector
= fb_helper
->connector_info
[j
]->connector
;
436 connector
->funcs
->dpms(connector
, dpms_mode
);
437 drm_object_property_set_value(&connector
->base
,
438 dev
->mode_config
.dpms_property
, dpms_mode
);
441 drm_modeset_unlock_all(dev
);
445 * drm_fb_helper_blank - implementation for ->fb_blank
446 * @blank: desired blanking state
447 * @info: fbdev registered by the helper
449 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
452 /* Display: On; HSync: On, VSync: On */
453 case FB_BLANK_UNBLANK
:
454 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
456 /* Display: Off; HSync: On, VSync: On */
457 case FB_BLANK_NORMAL
:
458 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
460 /* Display: Off; HSync: Off, VSync: On */
461 case FB_BLANK_HSYNC_SUSPEND
:
462 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
464 /* Display: Off; HSync: On, VSync: Off */
465 case FB_BLANK_VSYNC_SUSPEND
:
466 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
468 /* Display: Off; HSync: Off, VSync: Off */
469 case FB_BLANK_POWERDOWN
:
470 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
475 EXPORT_SYMBOL(drm_fb_helper_blank
);
477 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
481 for (i
= 0; i
< helper
->connector_count
; i
++)
482 kfree(helper
->connector_info
[i
]);
483 kfree(helper
->connector_info
);
484 for (i
= 0; i
< helper
->crtc_count
; i
++) {
485 kfree(helper
->crtc_info
[i
].mode_set
.connectors
);
486 if (helper
->crtc_info
[i
].mode_set
.mode
)
487 drm_mode_destroy(helper
->dev
, helper
->crtc_info
[i
].mode_set
.mode
);
489 kfree(helper
->crtc_info
);
493 * drm_fb_helper_init - initialize a drm_fb_helper structure
495 * @fb_helper: driver-allocated fbdev helper structure to initialize
496 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
497 * @max_conn_count: max connector count
499 * This allocates the structures for the fbdev helper with the given limits.
500 * Note that this won't yet touch the hardware (through the driver interfaces)
501 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
502 * to allow driver writes more control over the exact init sequence.
504 * Drivers must set fb_helper->funcs before calling
505 * drm_fb_helper_initial_config().
508 * Zero if everything went ok, nonzero otherwise.
510 int drm_fb_helper_init(struct drm_device
*dev
,
511 struct drm_fb_helper
*fb_helper
,
512 int crtc_count
, int max_conn_count
)
514 struct drm_crtc
*crtc
;
517 fb_helper
->dev
= dev
;
519 INIT_LIST_HEAD(&fb_helper
->kernel_fb_list
);
521 fb_helper
->crtc_info
= kcalloc(crtc_count
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
522 if (!fb_helper
->crtc_info
)
525 fb_helper
->crtc_count
= crtc_count
;
526 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
527 if (!fb_helper
->connector_info
) {
528 kfree(fb_helper
->crtc_info
);
531 fb_helper
->connector_count
= 0;
533 for (i
= 0; i
< crtc_count
; i
++) {
534 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
535 kcalloc(max_conn_count
,
536 sizeof(struct drm_connector
*),
539 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
541 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
545 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
546 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
552 drm_fb_helper_crtc_free(fb_helper
);
555 EXPORT_SYMBOL(drm_fb_helper_init
);
557 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
559 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
560 list_del(&fb_helper
->kernel_fb_list
);
561 if (list_empty(&kernel_fb_helper_list
)) {
562 pr_info("drm: unregistered panic notifier\n");
563 atomic_notifier_chain_unregister(&panic_notifier_list
,
565 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
569 drm_fb_helper_crtc_free(fb_helper
);
572 EXPORT_SYMBOL(drm_fb_helper_fini
);
574 static int setcolreg(struct drm_crtc
*crtc
, u16 red
, u16 green
,
575 u16 blue
, u16 regno
, struct fb_info
*info
)
577 struct drm_fb_helper
*fb_helper
= info
->par
;
578 struct drm_framebuffer
*fb
= fb_helper
->fb
;
581 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
) {
584 /* place color in psuedopalette */
587 palette
= (u32
*)info
->pseudo_palette
;
588 red
>>= (16 - info
->var
.red
.length
);
589 green
>>= (16 - info
->var
.green
.length
);
590 blue
>>= (16 - info
->var
.blue
.length
);
591 value
= (red
<< info
->var
.red
.offset
) |
592 (green
<< info
->var
.green
.offset
) |
593 (blue
<< info
->var
.blue
.offset
);
594 if (info
->var
.transp
.length
> 0) {
595 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
596 mask
<<= info
->var
.transp
.offset
;
599 palette
[regno
] = value
;
604 * The driver really shouldn't advertise pseudo/directcolor
605 * visuals if it can't deal with the palette.
607 if (WARN_ON(!fb_helper
->funcs
->gamma_set
||
608 !fb_helper
->funcs
->gamma_get
))
613 if (fb
->bits_per_pixel
== 16) {
616 if (fb
->depth
== 16 && regno
> 63)
618 if (fb
->depth
== 15 && regno
> 31)
621 if (fb
->depth
== 16) {
625 for (i
= 0; i
< 8; i
++)
626 fb_helper
->funcs
->gamma_set(crtc
, red
,
627 green
, blue
, pindex
+ i
);
630 fb_helper
->funcs
->gamma_get(crtc
, &r
,
634 for (i
= 0; i
< 4; i
++)
635 fb_helper
->funcs
->gamma_set(crtc
, r
,
642 fb_helper
->funcs
->gamma_set(crtc
, red
, green
, blue
, pindex
);
647 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
649 * @info: fbdev registered by the helper
651 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
653 struct drm_fb_helper
*fb_helper
= info
->par
;
654 struct drm_device
*dev
= fb_helper
->dev
;
655 struct drm_crtc_helper_funcs
*crtc_funcs
;
656 u16
*red
, *green
, *blue
, *transp
;
657 struct drm_crtc
*crtc
;
661 drm_modeset_lock_all(dev
);
662 if (!drm_fb_helper_is_bound(fb_helper
)) {
663 drm_modeset_unlock_all(dev
);
667 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
668 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
669 crtc_funcs
= crtc
->helper_private
;
674 transp
= cmap
->transp
;
677 for (j
= 0; j
< cmap
->len
; j
++) {
678 u16 hred
, hgreen
, hblue
, htransp
= 0xffff;
687 rc
= setcolreg(crtc
, hred
, hgreen
, hblue
, start
++, info
);
691 if (crtc_funcs
->load_lut
)
692 crtc_funcs
->load_lut(crtc
);
695 drm_modeset_unlock_all(dev
);
698 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
701 * drm_fb_helper_check_var - implementation for ->fb_check_var
702 * @var: screeninfo to check
703 * @info: fbdev registered by the helper
705 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
706 struct fb_info
*info
)
708 struct drm_fb_helper
*fb_helper
= info
->par
;
709 struct drm_framebuffer
*fb
= fb_helper
->fb
;
712 if (var
->pixclock
!= 0 || in_dbg_master())
715 /* Need to resize the fb object !!! */
716 if (var
->bits_per_pixel
> fb
->bits_per_pixel
||
717 var
->xres
> fb
->width
|| var
->yres
> fb
->height
||
718 var
->xres_virtual
> fb
->width
|| var
->yres_virtual
> fb
->height
) {
719 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
720 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
721 var
->xres
, var
->yres
, var
->bits_per_pixel
,
722 var
->xres_virtual
, var
->yres_virtual
,
723 fb
->width
, fb
->height
, fb
->bits_per_pixel
);
727 switch (var
->bits_per_pixel
) {
729 depth
= (var
->green
.length
== 6) ? 16 : 15;
732 depth
= (var
->transp
.length
> 0) ? 32 : 24;
735 depth
= var
->bits_per_pixel
;
742 var
->green
.offset
= 0;
743 var
->blue
.offset
= 0;
745 var
->green
.length
= 8;
746 var
->blue
.length
= 8;
747 var
->transp
.length
= 0;
748 var
->transp
.offset
= 0;
751 var
->red
.offset
= 10;
752 var
->green
.offset
= 5;
753 var
->blue
.offset
= 0;
755 var
->green
.length
= 5;
756 var
->blue
.length
= 5;
757 var
->transp
.length
= 1;
758 var
->transp
.offset
= 15;
761 var
->red
.offset
= 11;
762 var
->green
.offset
= 5;
763 var
->blue
.offset
= 0;
765 var
->green
.length
= 6;
766 var
->blue
.length
= 5;
767 var
->transp
.length
= 0;
768 var
->transp
.offset
= 0;
771 var
->red
.offset
= 16;
772 var
->green
.offset
= 8;
773 var
->blue
.offset
= 0;
775 var
->green
.length
= 8;
776 var
->blue
.length
= 8;
777 var
->transp
.length
= 0;
778 var
->transp
.offset
= 0;
781 var
->red
.offset
= 16;
782 var
->green
.offset
= 8;
783 var
->blue
.offset
= 0;
785 var
->green
.length
= 8;
786 var
->blue
.length
= 8;
787 var
->transp
.length
= 8;
788 var
->transp
.offset
= 24;
795 EXPORT_SYMBOL(drm_fb_helper_check_var
);
798 * drm_fb_helper_set_par - implementation for ->fb_set_par
799 * @info: fbdev registered by the helper
801 * This will let fbcon do the mode init and is called at initialization time by
802 * the fbdev core when registering the driver, and later on through the hotplug
805 int drm_fb_helper_set_par(struct fb_info
*info
)
807 struct drm_fb_helper
*fb_helper
= info
->par
;
808 struct drm_device
*dev
= fb_helper
->dev
;
809 struct fb_var_screeninfo
*var
= &info
->var
;
813 if (var
->pixclock
!= 0) {
814 DRM_ERROR("PIXEL CLOCK SET\n");
818 drm_modeset_lock_all(dev
);
819 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
820 ret
= drm_mode_set_config_internal(&fb_helper
->crtc_info
[i
].mode_set
);
822 drm_modeset_unlock_all(dev
);
826 drm_modeset_unlock_all(dev
);
828 if (fb_helper
->delayed_hotplug
) {
829 fb_helper
->delayed_hotplug
= false;
830 drm_fb_helper_hotplug_event(fb_helper
);
834 EXPORT_SYMBOL(drm_fb_helper_set_par
);
837 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
838 * @var: updated screen information
839 * @info: fbdev registered by the helper
841 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
842 struct fb_info
*info
)
844 struct drm_fb_helper
*fb_helper
= info
->par
;
845 struct drm_device
*dev
= fb_helper
->dev
;
846 struct drm_mode_set
*modeset
;
847 struct drm_crtc
*crtc
;
851 drm_modeset_lock_all(dev
);
852 if (!drm_fb_helper_is_bound(fb_helper
)) {
853 drm_modeset_unlock_all(dev
);
857 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
858 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
860 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
862 modeset
->x
= var
->xoffset
;
863 modeset
->y
= var
->yoffset
;
865 if (modeset
->num_connectors
) {
866 ret
= drm_mode_set_config_internal(modeset
);
868 info
->var
.xoffset
= var
->xoffset
;
869 info
->var
.yoffset
= var
->yoffset
;
873 drm_modeset_unlock_all(dev
);
876 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
879 * Allocates the backing storage and sets up the fbdev info structure through
880 * the ->fb_probe callback and then registers the fbdev and sets up the panic
883 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
889 struct fb_info
*info
;
890 struct drm_fb_helper_surface_size sizes
;
893 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
894 sizes
.surface_depth
= 24;
895 sizes
.surface_bpp
= 32;
896 sizes
.fb_width
= (unsigned)-1;
897 sizes
.fb_height
= (unsigned)-1;
899 /* if driver picks 8 or 16 by default use that
900 for both depth/bpp */
901 if (preferred_bpp
!= sizes
.surface_bpp
)
902 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
904 /* first up get a count of crtcs now in use and new min/maxes width/heights */
905 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
906 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
907 struct drm_cmdline_mode
*cmdline_mode
;
909 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
911 if (cmdline_mode
->bpp_specified
) {
912 switch (cmdline_mode
->bpp
) {
914 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
917 sizes
.surface_depth
= 15;
918 sizes
.surface_bpp
= 16;
921 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
924 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
927 sizes
.surface_depth
= 24;
928 sizes
.surface_bpp
= 32;
936 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
937 struct drm_display_mode
*desired_mode
;
938 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
942 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
943 if (desired_mode
->hdisplay
< sizes
.fb_width
)
944 sizes
.fb_width
= desired_mode
->hdisplay
;
945 if (desired_mode
->vdisplay
< sizes
.fb_height
)
946 sizes
.fb_height
= desired_mode
->vdisplay
;
947 if (desired_mode
->hdisplay
> sizes
.surface_width
)
948 sizes
.surface_width
= desired_mode
->hdisplay
;
949 if (desired_mode
->vdisplay
> sizes
.surface_height
)
950 sizes
.surface_height
= desired_mode
->vdisplay
;
955 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
956 /* hmm everyone went away - assume VGA cable just fell out
957 and will come back later. */
958 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
959 sizes
.fb_width
= sizes
.surface_width
= 1024;
960 sizes
.fb_height
= sizes
.surface_height
= 768;
963 /* push down into drivers */
964 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
968 info
= fb_helper
->fbdev
;
971 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
972 * events, but at init time drm_setup_crtcs needs to be called before
973 * the fb is allocated (since we need to figure out the desired size of
974 * the fb before we can allocate it ...). Hence we need to fix things up
977 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
978 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
979 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
982 info
->var
.pixclock
= 0;
983 if (register_framebuffer(info
) < 0)
986 dev_info(fb_helper
->dev
->dev
, "fb%d: %s frame buffer device\n",
987 info
->node
, info
->fix
.id
);
989 /* Switch back to kernel console on panic */
990 /* multi card linked list maybe */
991 if (list_empty(&kernel_fb_helper_list
)) {
992 dev_info(fb_helper
->dev
->dev
, "registered panic notifier\n");
993 atomic_notifier_chain_register(&panic_notifier_list
,
995 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
998 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
1004 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1005 * @info: fbdev registered by the helper
1006 * @pitch: desired pitch
1007 * @depth: desired depth
1009 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1010 * fbdev emulations. Drivers which support acceleration methods which impose
1011 * additional constraints need to set up their own limits.
1013 * Drivers should call this (or their equivalent setup code) from their
1014 * ->fb_probe callback.
1016 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1019 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1020 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1021 FB_VISUAL_TRUECOLOR
;
1022 info
->fix
.mmio_start
= 0;
1023 info
->fix
.mmio_len
= 0;
1024 info
->fix
.type_aux
= 0;
1025 info
->fix
.xpanstep
= 1; /* doing it in hw */
1026 info
->fix
.ypanstep
= 1; /* doing it in hw */
1027 info
->fix
.ywrapstep
= 0;
1028 info
->fix
.accel
= FB_ACCEL_NONE
;
1029 info
->fix
.type_aux
= 0;
1031 info
->fix
.line_length
= pitch
;
1034 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1037 * drm_fb_helper_fill_var - initalizes variable fbdev information
1038 * @info: fbdev instance to set up
1039 * @fb_helper: fb helper instance to use as template
1040 * @fb_width: desired fb width
1041 * @fb_height: desired fb height
1043 * Sets up the variable fbdev metainformation from the given fb helper instance
1044 * and the drm framebuffer allocated in fb_helper->fb.
1046 * Drivers should call this (or their equivalent setup code) from their
1047 * ->fb_probe callback after having allocated the fbdev backing
1048 * storage framebuffer.
1050 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1051 uint32_t fb_width
, uint32_t fb_height
)
1053 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1054 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1055 info
->var
.xres_virtual
= fb
->width
;
1056 info
->var
.yres_virtual
= fb
->height
;
1057 info
->var
.bits_per_pixel
= fb
->bits_per_pixel
;
1058 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1059 info
->var
.xoffset
= 0;
1060 info
->var
.yoffset
= 0;
1061 info
->var
.activate
= FB_ACTIVATE_NOW
;
1062 info
->var
.height
= -1;
1063 info
->var
.width
= -1;
1065 switch (fb
->depth
) {
1067 info
->var
.red
.offset
= 0;
1068 info
->var
.green
.offset
= 0;
1069 info
->var
.blue
.offset
= 0;
1070 info
->var
.red
.length
= 8; /* 8bit DAC */
1071 info
->var
.green
.length
= 8;
1072 info
->var
.blue
.length
= 8;
1073 info
->var
.transp
.offset
= 0;
1074 info
->var
.transp
.length
= 0;
1077 info
->var
.red
.offset
= 10;
1078 info
->var
.green
.offset
= 5;
1079 info
->var
.blue
.offset
= 0;
1080 info
->var
.red
.length
= 5;
1081 info
->var
.green
.length
= 5;
1082 info
->var
.blue
.length
= 5;
1083 info
->var
.transp
.offset
= 15;
1084 info
->var
.transp
.length
= 1;
1087 info
->var
.red
.offset
= 11;
1088 info
->var
.green
.offset
= 5;
1089 info
->var
.blue
.offset
= 0;
1090 info
->var
.red
.length
= 5;
1091 info
->var
.green
.length
= 6;
1092 info
->var
.blue
.length
= 5;
1093 info
->var
.transp
.offset
= 0;
1096 info
->var
.red
.offset
= 16;
1097 info
->var
.green
.offset
= 8;
1098 info
->var
.blue
.offset
= 0;
1099 info
->var
.red
.length
= 8;
1100 info
->var
.green
.length
= 8;
1101 info
->var
.blue
.length
= 8;
1102 info
->var
.transp
.offset
= 0;
1103 info
->var
.transp
.length
= 0;
1106 info
->var
.red
.offset
= 16;
1107 info
->var
.green
.offset
= 8;
1108 info
->var
.blue
.offset
= 0;
1109 info
->var
.red
.length
= 8;
1110 info
->var
.green
.length
= 8;
1111 info
->var
.blue
.length
= 8;
1112 info
->var
.transp
.offset
= 24;
1113 info
->var
.transp
.length
= 8;
1119 info
->var
.xres
= fb_width
;
1120 info
->var
.yres
= fb_height
;
1122 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1124 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1128 struct drm_connector
*connector
;
1132 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1133 connector
= fb_helper
->connector_info
[i
]->connector
;
1134 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1140 static struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1142 struct drm_display_mode
*mode
;
1144 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1145 if (drm_mode_width(mode
) > width
||
1146 drm_mode_height(mode
) > height
)
1148 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1154 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1156 struct drm_cmdline_mode
*cmdline_mode
;
1157 cmdline_mode
= &fb_connector
->cmdline_mode
;
1158 return cmdline_mode
->specified
;
1161 static struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
,
1162 int width
, int height
)
1164 struct drm_cmdline_mode
*cmdline_mode
;
1165 struct drm_display_mode
*mode
= NULL
;
1167 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
1168 if (cmdline_mode
->specified
== false)
1171 /* attempt to find a matching mode in the list of modes
1172 * we have gotten so far, if not add a CVT mode that conforms
1174 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1177 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1178 /* check width/height */
1179 if (mode
->hdisplay
!= cmdline_mode
->xres
||
1180 mode
->vdisplay
!= cmdline_mode
->yres
)
1183 if (cmdline_mode
->refresh_specified
) {
1184 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
1188 if (cmdline_mode
->interlace
) {
1189 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
1196 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
1198 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
1202 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
1207 enable
= connector
->status
== connector_status_connected
;
1209 enable
= connector
->status
!= connector_status_disconnected
;
1214 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
1217 bool any_enabled
= false;
1218 struct drm_connector
*connector
;
1221 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1222 connector
= fb_helper
->connector_info
[i
]->connector
;
1223 enabled
[i
] = drm_connector_enabled(connector
, true);
1224 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
1225 enabled
[i
] ? "yes" : "no");
1226 any_enabled
|= enabled
[i
];
1232 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1233 connector
= fb_helper
->connector_info
[i
]->connector
;
1234 enabled
[i
] = drm_connector_enabled(connector
, false);
1238 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
1239 struct drm_display_mode
**modes
,
1240 bool *enabled
, int width
, int height
)
1243 bool can_clone
= false;
1244 struct drm_fb_helper_connector
*fb_helper_conn
;
1245 struct drm_display_mode
*dmt_mode
, *mode
;
1247 /* only contemplate cloning in the single crtc case */
1248 if (fb_helper
->crtc_count
> 1)
1252 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1257 /* only contemplate cloning if more than one connector is enabled */
1261 /* check the command line or if nothing common pick 1024x768 */
1263 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1266 fb_helper_conn
= fb_helper
->connector_info
[i
];
1267 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1272 for (j
= 0; j
< i
; j
++) {
1275 if (!drm_mode_equal(modes
[j
], modes
[i
]))
1281 DRM_DEBUG_KMS("can clone using command line\n");
1285 /* try and find a 1024x768 mode on each connector */
1287 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
1289 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1294 fb_helper_conn
= fb_helper
->connector_info
[i
];
1295 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1296 if (drm_mode_equal(mode
, dmt_mode
))
1304 DRM_DEBUG_KMS("can clone using 1024x768\n");
1307 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1311 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
1312 struct drm_display_mode
**modes
,
1313 bool *enabled
, int width
, int height
)
1315 struct drm_fb_helper_connector
*fb_helper_conn
;
1318 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1319 fb_helper_conn
= fb_helper
->connector_info
[i
];
1321 if (enabled
[i
] == false)
1324 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1325 fb_helper_conn
->connector
->base
.id
);
1327 /* got for command line mode first */
1328 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1330 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1331 fb_helper_conn
->connector
->base
.id
);
1332 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
1334 /* No preferred modes, pick one off the list */
1335 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
1336 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
1339 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
1345 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
1346 struct drm_fb_helper_crtc
**best_crtcs
,
1347 struct drm_display_mode
**modes
,
1348 int n
, int width
, int height
)
1351 struct drm_device
*dev
= fb_helper
->dev
;
1352 struct drm_connector
*connector
;
1353 struct drm_connector_helper_funcs
*connector_funcs
;
1354 struct drm_encoder
*encoder
;
1355 struct drm_fb_helper_crtc
*best_crtc
;
1356 int my_score
, best_score
, score
;
1357 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
1358 struct drm_fb_helper_connector
*fb_helper_conn
;
1360 if (n
== fb_helper
->connector_count
)
1363 fb_helper_conn
= fb_helper
->connector_info
[n
];
1364 connector
= fb_helper_conn
->connector
;
1366 best_crtcs
[n
] = NULL
;
1368 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
1369 if (modes
[n
] == NULL
)
1372 crtcs
= kzalloc(dev
->mode_config
.num_connector
*
1373 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1378 if (connector
->status
== connector_status_connected
)
1380 if (drm_has_cmdline_mode(fb_helper_conn
))
1382 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
1385 connector_funcs
= connector
->helper_private
;
1386 encoder
= connector_funcs
->best_encoder(connector
);
1390 /* select a crtc for this connector and then attempt to configure
1391 remaining connectors */
1392 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
1393 crtc
= &fb_helper
->crtc_info
[c
];
1395 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
1398 for (o
= 0; o
< n
; o
++)
1399 if (best_crtcs
[o
] == crtc
)
1403 /* ignore cloning unless only a single crtc */
1404 if (fb_helper
->crtc_count
> 1)
1407 if (!drm_mode_equal(modes
[o
], modes
[n
]))
1412 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
1413 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
1415 if (score
> best_score
) {
1418 memcpy(best_crtcs
, crtcs
,
1419 dev
->mode_config
.num_connector
*
1420 sizeof(struct drm_fb_helper_crtc
*));
1428 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
)
1430 struct drm_device
*dev
= fb_helper
->dev
;
1431 struct drm_fb_helper_crtc
**crtcs
;
1432 struct drm_display_mode
**modes
;
1433 struct drm_mode_set
*modeset
;
1438 DRM_DEBUG_KMS("\n");
1440 width
= dev
->mode_config
.max_width
;
1441 height
= dev
->mode_config
.max_height
;
1443 crtcs
= kcalloc(dev
->mode_config
.num_connector
,
1444 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1445 modes
= kcalloc(dev
->mode_config
.num_connector
,
1446 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
1447 enabled
= kcalloc(dev
->mode_config
.num_connector
,
1448 sizeof(bool), GFP_KERNEL
);
1449 if (!crtcs
|| !modes
|| !enabled
) {
1450 DRM_ERROR("Memory allocation failed\n");
1455 drm_enable_connectors(fb_helper
, enabled
);
1457 if (!(fb_helper
->funcs
->initial_config
&&
1458 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
1459 enabled
, width
, height
))) {
1460 memset(modes
, 0, dev
->mode_config
.num_connector
*sizeof(modes
[0]));
1461 memset(crtcs
, 0, dev
->mode_config
.num_connector
*sizeof(crtcs
[0]));
1463 if (!drm_target_cloned(fb_helper
,
1464 modes
, enabled
, width
, height
) &&
1465 !drm_target_preferred(fb_helper
,
1466 modes
, enabled
, width
, height
))
1467 DRM_ERROR("Unable to find initial modes\n");
1469 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1472 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
1475 /* need to set the modesets up here for use later */
1476 /* fill out the connector<->crtc mappings into the modesets */
1477 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1478 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1479 modeset
->num_connectors
= 0;
1483 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1484 struct drm_display_mode
*mode
= modes
[i
];
1485 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
1486 modeset
= &fb_crtc
->mode_set
;
1488 if (mode
&& fb_crtc
) {
1489 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1490 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
);
1491 fb_crtc
->desired_mode
= mode
;
1493 drm_mode_destroy(dev
, modeset
->mode
);
1494 modeset
->mode
= drm_mode_duplicate(dev
,
1495 fb_crtc
->desired_mode
);
1496 modeset
->connectors
[modeset
->num_connectors
++] = fb_helper
->connector_info
[i
]->connector
;
1497 modeset
->fb
= fb_helper
->fb
;
1501 /* Clear out any old modes if there are no more connected outputs. */
1502 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1503 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1504 if (modeset
->num_connectors
== 0) {
1505 BUG_ON(modeset
->fb
);
1506 BUG_ON(modeset
->num_connectors
);
1508 drm_mode_destroy(dev
, modeset
->mode
);
1509 modeset
->mode
= NULL
;
1519 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1520 * @fb_helper: fb_helper device struct
1521 * @bpp_sel: bpp value to use for the framebuffer configuration
1523 * Scans the CRTCs and connectors and tries to put together an initial setup.
1524 * At the moment, this is a cloned configuration across all heads with
1525 * a new framebuffer object as the backing store.
1527 * Note that this also registers the fbdev and so allows userspace to call into
1528 * the driver through the fbdev interfaces.
1530 * This function will call down into the ->fb_probe callback to let
1531 * the driver allocate and initialize the fbdev info structure and the drm
1532 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1533 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1534 * values for the fbdev info structure.
1537 * Zero if everything went ok, nonzero otherwise.
1539 bool drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
1541 struct drm_device
*dev
= fb_helper
->dev
;
1544 drm_fb_helper_parse_command_line(fb_helper
);
1546 count
= drm_fb_helper_probe_connector_modes(fb_helper
,
1547 dev
->mode_config
.max_width
,
1548 dev
->mode_config
.max_height
);
1550 * we shouldn't end up with no modes here.
1553 dev_info(fb_helper
->dev
->dev
, "No connectors reported connected with modes\n");
1555 drm_setup_crtcs(fb_helper
);
1557 return drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
1559 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
1562 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1563 * probing all the outputs attached to the fb
1564 * @fb_helper: the drm_fb_helper
1566 * Scan the connectors attached to the fb_helper and try to put together a
1567 * setup after *notification of a change in output configuration.
1569 * Called at runtime, takes the mode config locks to be able to check/change the
1570 * modeset configuration. Must be run from process context (which usually means
1571 * either the output polling work or a work item launched from the driver's
1572 * hotplug interrupt).
1574 * Note that the driver must ensure that this is only called _after_ the fb has
1575 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1578 * 0 on success and a non-zero error code otherwise.
1580 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
1582 struct drm_device
*dev
= fb_helper
->dev
;
1584 u32 max_width
, max_height
, bpp_sel
;
1589 mutex_lock(&fb_helper
->dev
->mode_config
.mutex
);
1590 if (!drm_fb_helper_is_bound(fb_helper
)) {
1591 fb_helper
->delayed_hotplug
= true;
1592 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1595 DRM_DEBUG_KMS("\n");
1597 max_width
= fb_helper
->fb
->width
;
1598 max_height
= fb_helper
->fb
->height
;
1599 bpp_sel
= fb_helper
->fb
->bits_per_pixel
;
1601 count
= drm_fb_helper_probe_connector_modes(fb_helper
, max_width
,
1603 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1605 drm_modeset_lock_all(dev
);
1606 drm_setup_crtcs(fb_helper
);
1607 drm_modeset_unlock_all(dev
);
1608 drm_fb_helper_set_par(fb_helper
->fbdev
);
1612 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
1614 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1615 * but the module doesn't depend on any fb console symbols. At least
1616 * attempt to load fbcon to avoid leaving the system without a usable console.
1618 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1619 static int __init
drm_fb_helper_modinit(void)
1621 const char *name
= "fbcon";
1622 struct module
*fbcon
;
1624 mutex_lock(&module_mutex
);
1625 fbcon
= find_module(name
);
1626 mutex_unlock(&module_mutex
);
1629 request_module_nowait(name
);
1633 module_init(drm_fb_helper_modinit
);