2 * Copyright (c) 2006-2009 Red Hat Inc.
3 * Copyright (c) 2006-2008 Intel Corporation
4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
6 * DRM framebuffer helper functions
8 * Permission to use, copy, modify, distribute, and sell this software and its
9 * documentation for any purpose is hereby granted without fee, provided that
10 * the above copyright notice appear in all copies and that both that copyright
11 * notice and this permission notice appear in supporting documentation, and
12 * that the name of the copyright holders not be used in advertising or
13 * publicity pertaining to distribution of the software without specific,
14 * written prior permission. The copyright holders make no representations
15 * about the suitability of this software for any purpose. It is provided "as
16 * is" without express or implied warranty.
18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32 #include <linux/kernel.h>
33 #include <linux/sysrq.h>
34 #include <linux/slab.h>
36 #include <linux/module.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_crtc_helper.h>
42 static LIST_HEAD(kernel_fb_helper_list
);
47 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
48 * mode setting driver. They can be used mostly independently from the crtc
49 * helper functions used by many drivers to implement the kernel mode setting
52 * Initialization is done as a 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 behaviour 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 provides 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(connector
->name
, &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",
146 connector
->force
= mode
->force
;
149 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
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
)
235 return c
->primary
->fb
;
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
);
276 static bool restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
278 struct drm_device
*dev
= fb_helper
->dev
;
279 struct drm_plane
*plane
;
283 drm_warn_on_modeset_not_all_locked(dev
);
285 list_for_each_entry(plane
, &dev
->mode_config
.plane_list
, head
)
286 if (plane
->type
!= DRM_PLANE_TYPE_PRIMARY
)
287 drm_plane_force_disable(plane
);
289 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
290 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
291 struct drm_crtc
*crtc
= mode_set
->crtc
;
294 if (crtc
->funcs
->cursor_set
) {
295 ret
= crtc
->funcs
->cursor_set(crtc
, NULL
, 0, 0, 0);
300 ret
= drm_mode_set_config_internal(mode_set
);
307 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
308 * @fb_helper: fbcon to restore
310 * This should be called from driver's drm ->lastclose callback
311 * when implementing an fbcon on top of kms using this helper. This ensures that
312 * the user isn't greeted with a black screen when e.g. X dies.
314 * Use this variant if you need to bypass locking (panic), or already
315 * hold all modeset locks. Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
317 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
319 return restore_fbdev_mode(fb_helper
);
323 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
324 * @fb_helper: fbcon to restore
326 * This should be called from driver's drm ->lastclose callback
327 * when implementing an fbcon on top of kms using this helper. This ensures that
328 * the user isn't greeted with a black screen when e.g. X dies.
330 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper
*fb_helper
)
332 struct drm_device
*dev
= fb_helper
->dev
;
334 drm_modeset_lock_all(dev
);
335 ret
= restore_fbdev_mode(fb_helper
);
336 drm_modeset_unlock_all(dev
);
339 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked
);
342 * restore fbcon display for all kms driver's using this helper, used for sysrq
343 * and panic handling.
345 static bool drm_fb_helper_force_kernel_mode(void)
347 bool ret
, error
= false;
348 struct drm_fb_helper
*helper
;
350 if (list_empty(&kernel_fb_helper_list
))
353 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
354 struct drm_device
*dev
= helper
->dev
;
356 if (dev
->switch_power_state
== DRM_SWITCH_POWER_OFF
)
359 /* NOTE: we use lockless flag below to avoid grabbing other
360 * modeset locks. So just trylock the underlying mutex
363 if (!mutex_trylock(&dev
->mode_config
.mutex
)) {
368 ret
= drm_fb_helper_restore_fbdev_mode(helper
);
372 mutex_unlock(&dev
->mode_config
.mutex
);
377 static int drm_fb_helper_panic(struct notifier_block
*n
, unsigned long ununsed
,
381 * It's a waste of time and effort to switch back to text console
382 * if the kernel should reboot before panic messages can be seen.
384 if (panic_timeout
< 0)
387 pr_err("panic occurred, switching back to text console\n");
388 return drm_fb_helper_force_kernel_mode();
391 static struct notifier_block paniced
= {
392 .notifier_call
= drm_fb_helper_panic
,
395 static bool drm_fb_helper_is_bound(struct drm_fb_helper
*fb_helper
)
397 struct drm_device
*dev
= fb_helper
->dev
;
398 struct drm_crtc
*crtc
;
399 int bound
= 0, crtcs_bound
= 0;
401 /* Sometimes user space wants everything disabled, so don't steal the
402 * display if there's a master. */
403 if (dev
->primary
->master
)
406 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
407 if (crtc
->primary
->fb
)
409 if (crtc
->primary
->fb
== fb_helper
->fb
)
413 if (bound
< crtcs_bound
)
419 #ifdef CONFIG_MAGIC_SYSRQ
420 static void drm_fb_helper_restore_work_fn(struct work_struct
*ignored
)
423 ret
= drm_fb_helper_force_kernel_mode();
425 DRM_ERROR("Failed to restore crtc configuration\n");
427 static DECLARE_WORK(drm_fb_helper_restore_work
, drm_fb_helper_restore_work_fn
);
429 static void drm_fb_helper_sysrq(int dummy1
)
431 schedule_work(&drm_fb_helper_restore_work
);
434 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
435 .handler
= drm_fb_helper_sysrq
,
436 .help_msg
= "force-fb(V)",
437 .action_msg
= "Restore framebuffer console",
440 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= { };
443 static void drm_fb_helper_dpms(struct fb_info
*info
, int dpms_mode
)
445 struct drm_fb_helper
*fb_helper
= info
->par
;
446 struct drm_device
*dev
= fb_helper
->dev
;
447 struct drm_crtc
*crtc
;
448 struct drm_connector
*connector
;
452 * fbdev->blank can be called from irq context in case of a panic.
453 * Since we already have our own special panic handler which will
454 * restore the fbdev console mode completely, just bail out early.
456 if (oops_in_progress
)
460 * For each CRTC in this fb, turn the connectors on/off.
462 drm_modeset_lock_all(dev
);
463 if (!drm_fb_helper_is_bound(fb_helper
)) {
464 drm_modeset_unlock_all(dev
);
468 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
469 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
474 /* Walk the connectors & encoders on this fb turning them on/off */
475 for (j
= 0; j
< fb_helper
->connector_count
; j
++) {
476 connector
= fb_helper
->connector_info
[j
]->connector
;
477 connector
->funcs
->dpms(connector
, dpms_mode
);
478 drm_object_property_set_value(&connector
->base
,
479 dev
->mode_config
.dpms_property
, dpms_mode
);
482 drm_modeset_unlock_all(dev
);
486 * drm_fb_helper_blank - implementation for ->fb_blank
487 * @blank: desired blanking state
488 * @info: fbdev registered by the helper
490 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
493 /* Display: On; HSync: On, VSync: On */
494 case FB_BLANK_UNBLANK
:
495 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
497 /* Display: Off; HSync: On, VSync: On */
498 case FB_BLANK_NORMAL
:
499 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
501 /* Display: Off; HSync: Off, VSync: On */
502 case FB_BLANK_HSYNC_SUSPEND
:
503 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
505 /* Display: Off; HSync: On, VSync: Off */
506 case FB_BLANK_VSYNC_SUSPEND
:
507 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
509 /* Display: Off; HSync: Off, VSync: Off */
510 case FB_BLANK_POWERDOWN
:
511 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
516 EXPORT_SYMBOL(drm_fb_helper_blank
);
518 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
522 for (i
= 0; i
< helper
->connector_count
; i
++)
523 kfree(helper
->connector_info
[i
]);
524 kfree(helper
->connector_info
);
525 for (i
= 0; i
< helper
->crtc_count
; i
++) {
526 kfree(helper
->crtc_info
[i
].mode_set
.connectors
);
527 if (helper
->crtc_info
[i
].mode_set
.mode
)
528 drm_mode_destroy(helper
->dev
, helper
->crtc_info
[i
].mode_set
.mode
);
530 kfree(helper
->crtc_info
);
534 * drm_fb_helper_init - initialize a drm_fb_helper structure
536 * @fb_helper: driver-allocated fbdev helper structure to initialize
537 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
538 * @max_conn_count: max connector count
540 * This allocates the structures for the fbdev helper with the given limits.
541 * Note that this won't yet touch the hardware (through the driver interfaces)
542 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
543 * to allow driver writes more control over the exact init sequence.
545 * Drivers must set fb_helper->funcs before calling
546 * drm_fb_helper_initial_config().
549 * Zero if everything went ok, nonzero otherwise.
551 int drm_fb_helper_init(struct drm_device
*dev
,
552 struct drm_fb_helper
*fb_helper
,
553 int crtc_count
, int max_conn_count
)
555 struct drm_crtc
*crtc
;
561 fb_helper
->dev
= dev
;
563 INIT_LIST_HEAD(&fb_helper
->kernel_fb_list
);
565 fb_helper
->crtc_info
= kcalloc(crtc_count
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
566 if (!fb_helper
->crtc_info
)
569 fb_helper
->crtc_count
= crtc_count
;
570 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
571 if (!fb_helper
->connector_info
) {
572 kfree(fb_helper
->crtc_info
);
575 fb_helper
->connector_count
= 0;
577 for (i
= 0; i
< crtc_count
; i
++) {
578 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
579 kcalloc(max_conn_count
,
580 sizeof(struct drm_connector
*),
583 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
585 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
589 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
590 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
596 drm_fb_helper_crtc_free(fb_helper
);
599 EXPORT_SYMBOL(drm_fb_helper_init
);
601 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
603 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
604 list_del(&fb_helper
->kernel_fb_list
);
605 if (list_empty(&kernel_fb_helper_list
)) {
606 pr_info("drm: unregistered panic notifier\n");
607 atomic_notifier_chain_unregister(&panic_notifier_list
,
609 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
613 drm_fb_helper_crtc_free(fb_helper
);
616 EXPORT_SYMBOL(drm_fb_helper_fini
);
618 static int setcolreg(struct drm_crtc
*crtc
, u16 red
, u16 green
,
619 u16 blue
, u16 regno
, struct fb_info
*info
)
621 struct drm_fb_helper
*fb_helper
= info
->par
;
622 struct drm_framebuffer
*fb
= fb_helper
->fb
;
625 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
) {
628 /* place color in psuedopalette */
631 palette
= (u32
*)info
->pseudo_palette
;
632 red
>>= (16 - info
->var
.red
.length
);
633 green
>>= (16 - info
->var
.green
.length
);
634 blue
>>= (16 - info
->var
.blue
.length
);
635 value
= (red
<< info
->var
.red
.offset
) |
636 (green
<< info
->var
.green
.offset
) |
637 (blue
<< info
->var
.blue
.offset
);
638 if (info
->var
.transp
.length
> 0) {
639 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
640 mask
<<= info
->var
.transp
.offset
;
643 palette
[regno
] = value
;
648 * The driver really shouldn't advertise pseudo/directcolor
649 * visuals if it can't deal with the palette.
651 if (WARN_ON(!fb_helper
->funcs
->gamma_set
||
652 !fb_helper
->funcs
->gamma_get
))
657 if (fb
->bits_per_pixel
== 16) {
660 if (fb
->depth
== 16 && regno
> 63)
662 if (fb
->depth
== 15 && regno
> 31)
665 if (fb
->depth
== 16) {
669 for (i
= 0; i
< 8; i
++)
670 fb_helper
->funcs
->gamma_set(crtc
, red
,
671 green
, blue
, pindex
+ i
);
674 fb_helper
->funcs
->gamma_get(crtc
, &r
,
678 for (i
= 0; i
< 4; i
++)
679 fb_helper
->funcs
->gamma_set(crtc
, r
,
686 fb_helper
->funcs
->gamma_set(crtc
, red
, green
, blue
, pindex
);
691 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
693 * @info: fbdev registered by the helper
695 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
697 struct drm_fb_helper
*fb_helper
= info
->par
;
698 struct drm_device
*dev
= fb_helper
->dev
;
699 struct drm_crtc_helper_funcs
*crtc_funcs
;
700 u16
*red
, *green
, *blue
, *transp
;
701 struct drm_crtc
*crtc
;
705 drm_modeset_lock_all(dev
);
706 if (!drm_fb_helper_is_bound(fb_helper
)) {
707 drm_modeset_unlock_all(dev
);
711 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
712 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
713 crtc_funcs
= crtc
->helper_private
;
718 transp
= cmap
->transp
;
721 for (j
= 0; j
< cmap
->len
; j
++) {
722 u16 hred
, hgreen
, hblue
, htransp
= 0xffff;
731 rc
= setcolreg(crtc
, hred
, hgreen
, hblue
, start
++, info
);
735 if (crtc_funcs
->load_lut
)
736 crtc_funcs
->load_lut(crtc
);
739 drm_modeset_unlock_all(dev
);
742 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
745 * drm_fb_helper_check_var - implementation for ->fb_check_var
746 * @var: screeninfo to check
747 * @info: fbdev registered by the helper
749 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
750 struct fb_info
*info
)
752 struct drm_fb_helper
*fb_helper
= info
->par
;
753 struct drm_framebuffer
*fb
= fb_helper
->fb
;
756 if (var
->pixclock
!= 0 || in_dbg_master())
759 /* Need to resize the fb object !!! */
760 if (var
->bits_per_pixel
> fb
->bits_per_pixel
||
761 var
->xres
> fb
->width
|| var
->yres
> fb
->height
||
762 var
->xres_virtual
> fb
->width
|| var
->yres_virtual
> fb
->height
) {
763 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
764 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
765 var
->xres
, var
->yres
, var
->bits_per_pixel
,
766 var
->xres_virtual
, var
->yres_virtual
,
767 fb
->width
, fb
->height
, fb
->bits_per_pixel
);
771 switch (var
->bits_per_pixel
) {
773 depth
= (var
->green
.length
== 6) ? 16 : 15;
776 depth
= (var
->transp
.length
> 0) ? 32 : 24;
779 depth
= var
->bits_per_pixel
;
786 var
->green
.offset
= 0;
787 var
->blue
.offset
= 0;
789 var
->green
.length
= 8;
790 var
->blue
.length
= 8;
791 var
->transp
.length
= 0;
792 var
->transp
.offset
= 0;
795 var
->red
.offset
= 10;
796 var
->green
.offset
= 5;
797 var
->blue
.offset
= 0;
799 var
->green
.length
= 5;
800 var
->blue
.length
= 5;
801 var
->transp
.length
= 1;
802 var
->transp
.offset
= 15;
805 var
->red
.offset
= 11;
806 var
->green
.offset
= 5;
807 var
->blue
.offset
= 0;
809 var
->green
.length
= 6;
810 var
->blue
.length
= 5;
811 var
->transp
.length
= 0;
812 var
->transp
.offset
= 0;
815 var
->red
.offset
= 16;
816 var
->green
.offset
= 8;
817 var
->blue
.offset
= 0;
819 var
->green
.length
= 8;
820 var
->blue
.length
= 8;
821 var
->transp
.length
= 0;
822 var
->transp
.offset
= 0;
825 var
->red
.offset
= 16;
826 var
->green
.offset
= 8;
827 var
->blue
.offset
= 0;
829 var
->green
.length
= 8;
830 var
->blue
.length
= 8;
831 var
->transp
.length
= 8;
832 var
->transp
.offset
= 24;
839 EXPORT_SYMBOL(drm_fb_helper_check_var
);
842 * drm_fb_helper_set_par - implementation for ->fb_set_par
843 * @info: fbdev registered by the helper
845 * This will let fbcon do the mode init and is called at initialization time by
846 * the fbdev core when registering the driver, and later on through the hotplug
849 int drm_fb_helper_set_par(struct fb_info
*info
)
851 struct drm_fb_helper
*fb_helper
= info
->par
;
852 struct fb_var_screeninfo
*var
= &info
->var
;
854 if (var
->pixclock
!= 0) {
855 DRM_ERROR("PIXEL CLOCK SET\n");
859 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper
);
861 if (fb_helper
->delayed_hotplug
) {
862 fb_helper
->delayed_hotplug
= false;
863 drm_fb_helper_hotplug_event(fb_helper
);
867 EXPORT_SYMBOL(drm_fb_helper_set_par
);
870 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
871 * @var: updated screen information
872 * @info: fbdev registered by the helper
874 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
875 struct fb_info
*info
)
877 struct drm_fb_helper
*fb_helper
= info
->par
;
878 struct drm_device
*dev
= fb_helper
->dev
;
879 struct drm_mode_set
*modeset
;
883 drm_modeset_lock_all(dev
);
884 if (!drm_fb_helper_is_bound(fb_helper
)) {
885 drm_modeset_unlock_all(dev
);
889 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
890 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
892 modeset
->x
= var
->xoffset
;
893 modeset
->y
= var
->yoffset
;
895 if (modeset
->num_connectors
) {
896 ret
= drm_mode_set_config_internal(modeset
);
898 info
->var
.xoffset
= var
->xoffset
;
899 info
->var
.yoffset
= var
->yoffset
;
903 drm_modeset_unlock_all(dev
);
906 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
909 * Allocates the backing storage and sets up the fbdev info structure through
910 * the ->fb_probe callback and then registers the fbdev and sets up the panic
913 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
919 struct fb_info
*info
;
920 struct drm_fb_helper_surface_size sizes
;
923 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
924 sizes
.surface_depth
= 24;
925 sizes
.surface_bpp
= 32;
926 sizes
.fb_width
= (unsigned)-1;
927 sizes
.fb_height
= (unsigned)-1;
929 /* if driver picks 8 or 16 by default use that
930 for both depth/bpp */
931 if (preferred_bpp
!= sizes
.surface_bpp
)
932 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
934 /* first up get a count of crtcs now in use and new min/maxes width/heights */
935 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
936 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
937 struct drm_cmdline_mode
*cmdline_mode
;
939 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
941 if (cmdline_mode
->bpp_specified
) {
942 switch (cmdline_mode
->bpp
) {
944 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
947 sizes
.surface_depth
= 15;
948 sizes
.surface_bpp
= 16;
951 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
954 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
957 sizes
.surface_depth
= 24;
958 sizes
.surface_bpp
= 32;
966 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
967 struct drm_display_mode
*desired_mode
;
968 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
972 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
973 if (desired_mode
->hdisplay
< sizes
.fb_width
)
974 sizes
.fb_width
= desired_mode
->hdisplay
;
975 if (desired_mode
->vdisplay
< sizes
.fb_height
)
976 sizes
.fb_height
= desired_mode
->vdisplay
;
977 if (desired_mode
->hdisplay
> sizes
.surface_width
)
978 sizes
.surface_width
= desired_mode
->hdisplay
;
979 if (desired_mode
->vdisplay
> sizes
.surface_height
)
980 sizes
.surface_height
= desired_mode
->vdisplay
;
985 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
986 /* hmm everyone went away - assume VGA cable just fell out
987 and will come back later. */
988 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
989 sizes
.fb_width
= sizes
.surface_width
= 1024;
990 sizes
.fb_height
= sizes
.surface_height
= 768;
993 /* push down into drivers */
994 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
998 info
= fb_helper
->fbdev
;
1001 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1002 * events, but at init time drm_setup_crtcs needs to be called before
1003 * the fb is allocated (since we need to figure out the desired size of
1004 * the fb before we can allocate it ...). Hence we need to fix things up
1007 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
1008 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
1009 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
1012 info
->var
.pixclock
= 0;
1013 if (register_framebuffer(info
) < 0)
1016 dev_info(fb_helper
->dev
->dev
, "fb%d: %s frame buffer device\n",
1017 info
->node
, info
->fix
.id
);
1019 /* Switch back to kernel console on panic */
1020 /* multi card linked list maybe */
1021 if (list_empty(&kernel_fb_helper_list
)) {
1022 dev_info(fb_helper
->dev
->dev
, "registered panic notifier\n");
1023 atomic_notifier_chain_register(&panic_notifier_list
,
1025 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
1028 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
1034 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1035 * @info: fbdev registered by the helper
1036 * @pitch: desired pitch
1037 * @depth: desired depth
1039 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1040 * fbdev emulations. Drivers which support acceleration methods which impose
1041 * additional constraints need to set up their own limits.
1043 * Drivers should call this (or their equivalent setup code) from their
1044 * ->fb_probe callback.
1046 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1049 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1050 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1051 FB_VISUAL_TRUECOLOR
;
1052 info
->fix
.mmio_start
= 0;
1053 info
->fix
.mmio_len
= 0;
1054 info
->fix
.type_aux
= 0;
1055 info
->fix
.xpanstep
= 1; /* doing it in hw */
1056 info
->fix
.ypanstep
= 1; /* doing it in hw */
1057 info
->fix
.ywrapstep
= 0;
1058 info
->fix
.accel
= FB_ACCEL_NONE
;
1059 info
->fix
.type_aux
= 0;
1061 info
->fix
.line_length
= pitch
;
1064 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1067 * drm_fb_helper_fill_var - initalizes variable fbdev information
1068 * @info: fbdev instance to set up
1069 * @fb_helper: fb helper instance to use as template
1070 * @fb_width: desired fb width
1071 * @fb_height: desired fb height
1073 * Sets up the variable fbdev metainformation from the given fb helper instance
1074 * and the drm framebuffer allocated in fb_helper->fb.
1076 * Drivers should call this (or their equivalent setup code) from their
1077 * ->fb_probe callback after having allocated the fbdev backing
1078 * storage framebuffer.
1080 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1081 uint32_t fb_width
, uint32_t fb_height
)
1083 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1084 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1085 info
->var
.xres_virtual
= fb
->width
;
1086 info
->var
.yres_virtual
= fb
->height
;
1087 info
->var
.bits_per_pixel
= fb
->bits_per_pixel
;
1088 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1089 info
->var
.xoffset
= 0;
1090 info
->var
.yoffset
= 0;
1091 info
->var
.activate
= FB_ACTIVATE_NOW
;
1092 info
->var
.height
= -1;
1093 info
->var
.width
= -1;
1095 switch (fb
->depth
) {
1097 info
->var
.red
.offset
= 0;
1098 info
->var
.green
.offset
= 0;
1099 info
->var
.blue
.offset
= 0;
1100 info
->var
.red
.length
= 8; /* 8bit DAC */
1101 info
->var
.green
.length
= 8;
1102 info
->var
.blue
.length
= 8;
1103 info
->var
.transp
.offset
= 0;
1104 info
->var
.transp
.length
= 0;
1107 info
->var
.red
.offset
= 10;
1108 info
->var
.green
.offset
= 5;
1109 info
->var
.blue
.offset
= 0;
1110 info
->var
.red
.length
= 5;
1111 info
->var
.green
.length
= 5;
1112 info
->var
.blue
.length
= 5;
1113 info
->var
.transp
.offset
= 15;
1114 info
->var
.transp
.length
= 1;
1117 info
->var
.red
.offset
= 11;
1118 info
->var
.green
.offset
= 5;
1119 info
->var
.blue
.offset
= 0;
1120 info
->var
.red
.length
= 5;
1121 info
->var
.green
.length
= 6;
1122 info
->var
.blue
.length
= 5;
1123 info
->var
.transp
.offset
= 0;
1126 info
->var
.red
.offset
= 16;
1127 info
->var
.green
.offset
= 8;
1128 info
->var
.blue
.offset
= 0;
1129 info
->var
.red
.length
= 8;
1130 info
->var
.green
.length
= 8;
1131 info
->var
.blue
.length
= 8;
1132 info
->var
.transp
.offset
= 0;
1133 info
->var
.transp
.length
= 0;
1136 info
->var
.red
.offset
= 16;
1137 info
->var
.green
.offset
= 8;
1138 info
->var
.blue
.offset
= 0;
1139 info
->var
.red
.length
= 8;
1140 info
->var
.green
.length
= 8;
1141 info
->var
.blue
.length
= 8;
1142 info
->var
.transp
.offset
= 24;
1143 info
->var
.transp
.length
= 8;
1149 info
->var
.xres
= fb_width
;
1150 info
->var
.yres
= fb_height
;
1152 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1154 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1158 struct drm_connector
*connector
;
1162 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1163 connector
= fb_helper
->connector_info
[i
]->connector
;
1164 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1170 struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1172 struct drm_display_mode
*mode
;
1174 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1175 if (mode
->hdisplay
> width
||
1176 mode
->vdisplay
> height
)
1178 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1183 EXPORT_SYMBOL(drm_has_preferred_mode
);
1185 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1187 struct drm_cmdline_mode
*cmdline_mode
;
1188 cmdline_mode
= &fb_connector
->cmdline_mode
;
1189 return cmdline_mode
->specified
;
1192 struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
,
1193 int width
, int height
)
1195 struct drm_cmdline_mode
*cmdline_mode
;
1196 struct drm_display_mode
*mode
= NULL
;
1197 bool prefer_non_interlace
;
1199 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
1200 if (cmdline_mode
->specified
== false)
1203 /* attempt to find a matching mode in the list of modes
1204 * we have gotten so far, if not add a CVT mode that conforms
1206 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1209 prefer_non_interlace
= !cmdline_mode
->interlace
;
1211 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1212 /* check width/height */
1213 if (mode
->hdisplay
!= cmdline_mode
->xres
||
1214 mode
->vdisplay
!= cmdline_mode
->yres
)
1217 if (cmdline_mode
->refresh_specified
) {
1218 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
1222 if (cmdline_mode
->interlace
) {
1223 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
1225 } else if (prefer_non_interlace
) {
1226 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
1232 if (prefer_non_interlace
) {
1233 prefer_non_interlace
= false;
1238 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
1240 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
1243 EXPORT_SYMBOL(drm_pick_cmdline_mode
);
1245 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
1250 enable
= connector
->status
== connector_status_connected
;
1252 enable
= connector
->status
!= connector_status_disconnected
;
1257 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
1260 bool any_enabled
= false;
1261 struct drm_connector
*connector
;
1264 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1265 connector
= fb_helper
->connector_info
[i
]->connector
;
1266 enabled
[i
] = drm_connector_enabled(connector
, true);
1267 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
1268 enabled
[i
] ? "yes" : "no");
1269 any_enabled
|= enabled
[i
];
1275 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1276 connector
= fb_helper
->connector_info
[i
]->connector
;
1277 enabled
[i
] = drm_connector_enabled(connector
, false);
1281 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
1282 struct drm_display_mode
**modes
,
1283 bool *enabled
, int width
, int height
)
1286 bool can_clone
= false;
1287 struct drm_fb_helper_connector
*fb_helper_conn
;
1288 struct drm_display_mode
*dmt_mode
, *mode
;
1290 /* only contemplate cloning in the single crtc case */
1291 if (fb_helper
->crtc_count
> 1)
1295 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1300 /* only contemplate cloning if more than one connector is enabled */
1304 /* check the command line or if nothing common pick 1024x768 */
1306 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1309 fb_helper_conn
= fb_helper
->connector_info
[i
];
1310 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1315 for (j
= 0; j
< i
; j
++) {
1318 if (!drm_mode_equal(modes
[j
], modes
[i
]))
1324 DRM_DEBUG_KMS("can clone using command line\n");
1328 /* try and find a 1024x768 mode on each connector */
1330 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
1332 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1337 fb_helper_conn
= fb_helper
->connector_info
[i
];
1338 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1339 if (drm_mode_equal(mode
, dmt_mode
))
1347 DRM_DEBUG_KMS("can clone using 1024x768\n");
1350 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1354 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
1355 struct drm_display_mode
**modes
,
1356 bool *enabled
, int width
, int height
)
1358 struct drm_fb_helper_connector
*fb_helper_conn
;
1361 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1362 fb_helper_conn
= fb_helper
->connector_info
[i
];
1364 if (enabled
[i
] == false)
1367 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1368 fb_helper_conn
->connector
->base
.id
);
1370 /* got for command line mode first */
1371 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1373 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1374 fb_helper_conn
->connector
->base
.id
);
1375 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
1377 /* No preferred modes, pick one off the list */
1378 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
1379 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
1382 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
1388 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
1389 struct drm_fb_helper_crtc
**best_crtcs
,
1390 struct drm_display_mode
**modes
,
1391 int n
, int width
, int height
)
1394 struct drm_device
*dev
= fb_helper
->dev
;
1395 struct drm_connector
*connector
;
1396 struct drm_connector_helper_funcs
*connector_funcs
;
1397 struct drm_encoder
*encoder
;
1398 int my_score
, best_score
, score
;
1399 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
1400 struct drm_fb_helper_connector
*fb_helper_conn
;
1402 if (n
== fb_helper
->connector_count
)
1405 fb_helper_conn
= fb_helper
->connector_info
[n
];
1406 connector
= fb_helper_conn
->connector
;
1408 best_crtcs
[n
] = NULL
;
1409 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
1410 if (modes
[n
] == NULL
)
1413 crtcs
= kzalloc(dev
->mode_config
.num_connector
*
1414 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1419 if (connector
->status
== connector_status_connected
)
1421 if (drm_has_cmdline_mode(fb_helper_conn
))
1423 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
1426 connector_funcs
= connector
->helper_private
;
1427 encoder
= connector_funcs
->best_encoder(connector
);
1431 /* select a crtc for this connector and then attempt to configure
1432 remaining connectors */
1433 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
1434 crtc
= &fb_helper
->crtc_info
[c
];
1436 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
1439 for (o
= 0; o
< n
; o
++)
1440 if (best_crtcs
[o
] == crtc
)
1444 /* ignore cloning unless only a single crtc */
1445 if (fb_helper
->crtc_count
> 1)
1448 if (!drm_mode_equal(modes
[o
], modes
[n
]))
1453 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
1454 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
1456 if (score
> best_score
) {
1458 memcpy(best_crtcs
, crtcs
,
1459 dev
->mode_config
.num_connector
*
1460 sizeof(struct drm_fb_helper_crtc
*));
1468 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
)
1470 struct drm_device
*dev
= fb_helper
->dev
;
1471 struct drm_fb_helper_crtc
**crtcs
;
1472 struct drm_display_mode
**modes
;
1473 struct drm_mode_set
*modeset
;
1478 DRM_DEBUG_KMS("\n");
1480 width
= dev
->mode_config
.max_width
;
1481 height
= dev
->mode_config
.max_height
;
1483 crtcs
= kcalloc(dev
->mode_config
.num_connector
,
1484 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1485 modes
= kcalloc(dev
->mode_config
.num_connector
,
1486 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
1487 enabled
= kcalloc(dev
->mode_config
.num_connector
,
1488 sizeof(bool), GFP_KERNEL
);
1489 if (!crtcs
|| !modes
|| !enabled
) {
1490 DRM_ERROR("Memory allocation failed\n");
1495 drm_enable_connectors(fb_helper
, enabled
);
1497 if (!(fb_helper
->funcs
->initial_config
&&
1498 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
1499 enabled
, width
, height
))) {
1500 memset(modes
, 0, dev
->mode_config
.num_connector
*sizeof(modes
[0]));
1501 memset(crtcs
, 0, dev
->mode_config
.num_connector
*sizeof(crtcs
[0]));
1503 if (!drm_target_cloned(fb_helper
,
1504 modes
, enabled
, width
, height
) &&
1505 !drm_target_preferred(fb_helper
,
1506 modes
, enabled
, width
, height
))
1507 DRM_ERROR("Unable to find initial modes\n");
1509 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1512 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
1515 /* need to set the modesets up here for use later */
1516 /* fill out the connector<->crtc mappings into the modesets */
1517 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1518 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1519 modeset
->num_connectors
= 0;
1523 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1524 struct drm_display_mode
*mode
= modes
[i
];
1525 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
1526 modeset
= &fb_crtc
->mode_set
;
1528 if (mode
&& fb_crtc
) {
1529 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1530 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
);
1531 fb_crtc
->desired_mode
= mode
;
1533 drm_mode_destroy(dev
, modeset
->mode
);
1534 modeset
->mode
= drm_mode_duplicate(dev
,
1535 fb_crtc
->desired_mode
);
1536 modeset
->connectors
[modeset
->num_connectors
++] = fb_helper
->connector_info
[i
]->connector
;
1537 modeset
->fb
= fb_helper
->fb
;
1541 /* Clear out any old modes if there are no more connected outputs. */
1542 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1543 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1544 if (modeset
->num_connectors
== 0) {
1545 BUG_ON(modeset
->fb
);
1546 BUG_ON(modeset
->num_connectors
);
1548 drm_mode_destroy(dev
, modeset
->mode
);
1549 modeset
->mode
= NULL
;
1559 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1560 * @fb_helper: fb_helper device struct
1561 * @bpp_sel: bpp value to use for the framebuffer configuration
1563 * Scans the CRTCs and connectors and tries to put together an initial setup.
1564 * At the moment, this is a cloned configuration across all heads with
1565 * a new framebuffer object as the backing store.
1567 * Note that this also registers the fbdev and so allows userspace to call into
1568 * the driver through the fbdev interfaces.
1570 * This function will call down into the ->fb_probe callback to let
1571 * the driver allocate and initialize the fbdev info structure and the drm
1572 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1573 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1574 * values for the fbdev info structure.
1577 * Zero if everything went ok, nonzero otherwise.
1579 bool drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
1581 struct drm_device
*dev
= fb_helper
->dev
;
1584 drm_fb_helper_parse_command_line(fb_helper
);
1586 mutex_lock(&dev
->mode_config
.mutex
);
1587 count
= drm_fb_helper_probe_connector_modes(fb_helper
,
1588 dev
->mode_config
.max_width
,
1589 dev
->mode_config
.max_height
);
1590 mutex_unlock(&dev
->mode_config
.mutex
);
1592 * we shouldn't end up with no modes here.
1595 dev_info(fb_helper
->dev
->dev
, "No connectors reported connected with modes\n");
1597 drm_setup_crtcs(fb_helper
);
1599 return drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
1601 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
1604 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1605 * probing all the outputs attached to the fb
1606 * @fb_helper: the drm_fb_helper
1608 * Scan the connectors attached to the fb_helper and try to put together a
1609 * setup after *notification of a change in output configuration.
1611 * Called at runtime, takes the mode config locks to be able to check/change the
1612 * modeset configuration. Must be run from process context (which usually means
1613 * either the output polling work or a work item launched from the driver's
1614 * hotplug interrupt).
1616 * Note that the driver must ensure that this is only called _after_ the fb has
1617 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1620 * 0 on success and a non-zero error code otherwise.
1622 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
1624 struct drm_device
*dev
= fb_helper
->dev
;
1625 u32 max_width
, max_height
;
1630 mutex_lock(&fb_helper
->dev
->mode_config
.mutex
);
1631 if (!drm_fb_helper_is_bound(fb_helper
)) {
1632 fb_helper
->delayed_hotplug
= true;
1633 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1636 DRM_DEBUG_KMS("\n");
1638 max_width
= fb_helper
->fb
->width
;
1639 max_height
= fb_helper
->fb
->height
;
1641 drm_fb_helper_probe_connector_modes(fb_helper
, max_width
, max_height
);
1642 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1644 drm_modeset_lock_all(dev
);
1645 drm_setup_crtcs(fb_helper
);
1646 drm_modeset_unlock_all(dev
);
1647 drm_fb_helper_set_par(fb_helper
->fbdev
);
1651 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
1653 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1654 * but the module doesn't depend on any fb console symbols. At least
1655 * attempt to load fbcon to avoid leaving the system without a usable console.
1657 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1658 static int __init
drm_fb_helper_modinit(void)
1660 const char *name
= "fbcon";
1661 struct module
*fbcon
;
1663 mutex_lock(&module_mutex
);
1664 fbcon
= find_module(name
);
1665 mutex_unlock(&module_mutex
);
1668 request_module_nowait(name
);
1672 module_init(drm_fb_helper_modinit
);