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 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
203 for (i
= 0; i
< helper
->crtc_count
; i
++) {
204 struct drm_mode_set
*mode_set
=
205 &helper
->crtc_info
[i
].mode_set
;
207 if (!mode_set
->crtc
->enabled
)
210 funcs
= mode_set
->crtc
->helper_private
;
211 drm_fb_helper_save_lut_atomic(mode_set
->crtc
, helper
);
212 funcs
->mode_set_base_atomic(mode_set
->crtc
,
216 ENTER_ATOMIC_MODE_SET
);
222 EXPORT_SYMBOL(drm_fb_helper_debug_enter
);
224 /* Find the real fb for a given fb helper CRTC */
225 static struct drm_framebuffer
*drm_mode_config_fb(struct drm_crtc
*crtc
)
227 struct drm_device
*dev
= crtc
->dev
;
230 list_for_each_entry(c
, &dev
->mode_config
.crtc_list
, head
) {
231 if (crtc
->base
.id
== c
->base
.id
)
232 return c
->primary
->fb
;
239 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
240 * @info: fbdev registered by the helper
242 int drm_fb_helper_debug_leave(struct fb_info
*info
)
244 struct drm_fb_helper
*helper
= info
->par
;
245 struct drm_crtc
*crtc
;
246 struct drm_crtc_helper_funcs
*funcs
;
247 struct drm_framebuffer
*fb
;
250 for (i
= 0; i
< helper
->crtc_count
; i
++) {
251 struct drm_mode_set
*mode_set
= &helper
->crtc_info
[i
].mode_set
;
252 crtc
= mode_set
->crtc
;
253 funcs
= crtc
->helper_private
;
254 fb
= drm_mode_config_fb(crtc
);
260 DRM_ERROR("no fb to restore??\n");
264 drm_fb_helper_restore_lut_atomic(mode_set
->crtc
);
265 funcs
->mode_set_base_atomic(mode_set
->crtc
, fb
, crtc
->x
,
266 crtc
->y
, LEAVE_ATOMIC_MODE_SET
);
271 EXPORT_SYMBOL(drm_fb_helper_debug_leave
);
273 static bool restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
275 struct drm_device
*dev
= fb_helper
->dev
;
276 struct drm_plane
*plane
;
280 drm_warn_on_modeset_not_all_locked(dev
);
282 list_for_each_entry(plane
, &dev
->mode_config
.plane_list
, head
)
283 if (plane
->type
!= DRM_PLANE_TYPE_PRIMARY
)
284 drm_plane_force_disable(plane
);
286 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
287 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
288 struct drm_crtc
*crtc
= mode_set
->crtc
;
291 if (crtc
->funcs
->cursor_set
) {
292 ret
= crtc
->funcs
->cursor_set(crtc
, NULL
, 0, 0, 0);
297 ret
= drm_mode_set_config_internal(mode_set
);
304 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
305 * @fb_helper: fbcon to restore
307 * This should be called from driver's drm ->lastclose callback
308 * when implementing an fbcon on top of kms using this helper. This ensures that
309 * the user isn't greeted with a black screen when e.g. X dies.
311 * Use this variant if you need to bypass locking (panic), or already
312 * hold all modeset locks. Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
314 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
316 return restore_fbdev_mode(fb_helper
);
320 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
321 * @fb_helper: fbcon to restore
323 * This should be called from driver's drm ->lastclose callback
324 * when implementing an fbcon on top of kms using this helper. This ensures that
325 * the user isn't greeted with a black screen when e.g. X dies.
327 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper
*fb_helper
)
329 struct drm_device
*dev
= fb_helper
->dev
;
331 drm_modeset_lock_all(dev
);
332 ret
= restore_fbdev_mode(fb_helper
);
333 drm_modeset_unlock_all(dev
);
336 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked
);
339 * restore fbcon display for all kms driver's using this helper, used for sysrq
340 * and panic handling.
342 static bool drm_fb_helper_force_kernel_mode(void)
344 bool ret
, error
= false;
345 struct drm_fb_helper
*helper
;
347 if (list_empty(&kernel_fb_helper_list
))
350 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
351 struct drm_device
*dev
= helper
->dev
;
353 if (dev
->switch_power_state
== DRM_SWITCH_POWER_OFF
)
356 /* NOTE: we use lockless flag below to avoid grabbing other
357 * modeset locks. So just trylock the underlying mutex
360 if (!mutex_trylock(&dev
->mode_config
.mutex
)) {
365 ret
= drm_fb_helper_restore_fbdev_mode(helper
);
369 mutex_unlock(&dev
->mode_config
.mutex
);
374 static int drm_fb_helper_panic(struct notifier_block
*n
, unsigned long ununsed
,
378 * It's a waste of time and effort to switch back to text console
379 * if the kernel should reboot before panic messages can be seen.
381 if (panic_timeout
< 0)
384 pr_err("panic occurred, switching back to text console\n");
385 return drm_fb_helper_force_kernel_mode();
388 static struct notifier_block paniced
= {
389 .notifier_call
= drm_fb_helper_panic
,
392 static bool drm_fb_helper_is_bound(struct drm_fb_helper
*fb_helper
)
394 struct drm_device
*dev
= fb_helper
->dev
;
395 struct drm_crtc
*crtc
;
396 int bound
= 0, crtcs_bound
= 0;
398 /* Sometimes user space wants everything disabled, so don't steal the
399 * display if there's a master. */
400 if (dev
->primary
->master
)
403 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
404 if (crtc
->primary
->fb
)
406 if (crtc
->primary
->fb
== fb_helper
->fb
)
410 if (bound
< crtcs_bound
)
416 #ifdef CONFIG_MAGIC_SYSRQ
417 static void drm_fb_helper_restore_work_fn(struct work_struct
*ignored
)
420 ret
= drm_fb_helper_force_kernel_mode();
422 DRM_ERROR("Failed to restore crtc configuration\n");
424 static DECLARE_WORK(drm_fb_helper_restore_work
, drm_fb_helper_restore_work_fn
);
426 static void drm_fb_helper_sysrq(int dummy1
)
428 schedule_work(&drm_fb_helper_restore_work
);
431 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
432 .handler
= drm_fb_helper_sysrq
,
433 .help_msg
= "force-fb(V)",
434 .action_msg
= "Restore framebuffer console",
437 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= { };
440 static void drm_fb_helper_dpms(struct fb_info
*info
, int dpms_mode
)
442 struct drm_fb_helper
*fb_helper
= info
->par
;
443 struct drm_device
*dev
= fb_helper
->dev
;
444 struct drm_crtc
*crtc
;
445 struct drm_connector
*connector
;
449 * fbdev->blank can be called from irq context in case of a panic.
450 * Since we already have our own special panic handler which will
451 * restore the fbdev console mode completely, just bail out early.
453 if (oops_in_progress
)
457 * For each CRTC in this fb, turn the connectors on/off.
459 drm_modeset_lock_all(dev
);
460 if (!drm_fb_helper_is_bound(fb_helper
)) {
461 drm_modeset_unlock_all(dev
);
465 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
466 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
471 /* Walk the connectors & encoders on this fb turning them on/off */
472 for (j
= 0; j
< fb_helper
->connector_count
; j
++) {
473 connector
= fb_helper
->connector_info
[j
]->connector
;
474 connector
->funcs
->dpms(connector
, dpms_mode
);
475 drm_object_property_set_value(&connector
->base
,
476 dev
->mode_config
.dpms_property
, dpms_mode
);
479 drm_modeset_unlock_all(dev
);
483 * drm_fb_helper_blank - implementation for ->fb_blank
484 * @blank: desired blanking state
485 * @info: fbdev registered by the helper
487 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
490 /* Display: On; HSync: On, VSync: On */
491 case FB_BLANK_UNBLANK
:
492 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
494 /* Display: Off; HSync: On, VSync: On */
495 case FB_BLANK_NORMAL
:
496 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
498 /* Display: Off; HSync: Off, VSync: On */
499 case FB_BLANK_HSYNC_SUSPEND
:
500 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
502 /* Display: Off; HSync: On, VSync: Off */
503 case FB_BLANK_VSYNC_SUSPEND
:
504 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
506 /* Display: Off; HSync: Off, VSync: Off */
507 case FB_BLANK_POWERDOWN
:
508 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
513 EXPORT_SYMBOL(drm_fb_helper_blank
);
515 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
519 for (i
= 0; i
< helper
->connector_count
; i
++)
520 kfree(helper
->connector_info
[i
]);
521 kfree(helper
->connector_info
);
522 for (i
= 0; i
< helper
->crtc_count
; i
++) {
523 kfree(helper
->crtc_info
[i
].mode_set
.connectors
);
524 if (helper
->crtc_info
[i
].mode_set
.mode
)
525 drm_mode_destroy(helper
->dev
, helper
->crtc_info
[i
].mode_set
.mode
);
527 kfree(helper
->crtc_info
);
531 * drm_fb_helper_init - initialize a drm_fb_helper structure
533 * @fb_helper: driver-allocated fbdev helper structure to initialize
534 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
535 * @max_conn_count: max connector count
537 * This allocates the structures for the fbdev helper with the given limits.
538 * Note that this won't yet touch the hardware (through the driver interfaces)
539 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
540 * to allow driver writes more control over the exact init sequence.
542 * Drivers must set fb_helper->funcs before calling
543 * drm_fb_helper_initial_config().
546 * Zero if everything went ok, nonzero otherwise.
548 int drm_fb_helper_init(struct drm_device
*dev
,
549 struct drm_fb_helper
*fb_helper
,
550 int crtc_count
, int max_conn_count
)
552 struct drm_crtc
*crtc
;
558 fb_helper
->dev
= dev
;
560 INIT_LIST_HEAD(&fb_helper
->kernel_fb_list
);
562 fb_helper
->crtc_info
= kcalloc(crtc_count
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
563 if (!fb_helper
->crtc_info
)
566 fb_helper
->crtc_count
= crtc_count
;
567 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
568 if (!fb_helper
->connector_info
) {
569 kfree(fb_helper
->crtc_info
);
572 fb_helper
->connector_count
= 0;
574 for (i
= 0; i
< crtc_count
; i
++) {
575 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
576 kcalloc(max_conn_count
,
577 sizeof(struct drm_connector
*),
580 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
582 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
586 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
587 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
593 drm_fb_helper_crtc_free(fb_helper
);
596 EXPORT_SYMBOL(drm_fb_helper_init
);
598 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
600 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
601 list_del(&fb_helper
->kernel_fb_list
);
602 if (list_empty(&kernel_fb_helper_list
)) {
603 pr_info("drm: unregistered panic notifier\n");
604 atomic_notifier_chain_unregister(&panic_notifier_list
,
606 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
610 drm_fb_helper_crtc_free(fb_helper
);
613 EXPORT_SYMBOL(drm_fb_helper_fini
);
615 static int setcolreg(struct drm_crtc
*crtc
, u16 red
, u16 green
,
616 u16 blue
, u16 regno
, struct fb_info
*info
)
618 struct drm_fb_helper
*fb_helper
= info
->par
;
619 struct drm_framebuffer
*fb
= fb_helper
->fb
;
622 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
) {
625 /* place color in psuedopalette */
628 palette
= (u32
*)info
->pseudo_palette
;
629 red
>>= (16 - info
->var
.red
.length
);
630 green
>>= (16 - info
->var
.green
.length
);
631 blue
>>= (16 - info
->var
.blue
.length
);
632 value
= (red
<< info
->var
.red
.offset
) |
633 (green
<< info
->var
.green
.offset
) |
634 (blue
<< info
->var
.blue
.offset
);
635 if (info
->var
.transp
.length
> 0) {
636 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
637 mask
<<= info
->var
.transp
.offset
;
640 palette
[regno
] = value
;
645 * The driver really shouldn't advertise pseudo/directcolor
646 * visuals if it can't deal with the palette.
648 if (WARN_ON(!fb_helper
->funcs
->gamma_set
||
649 !fb_helper
->funcs
->gamma_get
))
654 if (fb
->bits_per_pixel
== 16) {
657 if (fb
->depth
== 16 && regno
> 63)
659 if (fb
->depth
== 15 && regno
> 31)
662 if (fb
->depth
== 16) {
666 for (i
= 0; i
< 8; i
++)
667 fb_helper
->funcs
->gamma_set(crtc
, red
,
668 green
, blue
, pindex
+ i
);
671 fb_helper
->funcs
->gamma_get(crtc
, &r
,
675 for (i
= 0; i
< 4; i
++)
676 fb_helper
->funcs
->gamma_set(crtc
, r
,
683 fb_helper
->funcs
->gamma_set(crtc
, red
, green
, blue
, pindex
);
688 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
690 * @info: fbdev registered by the helper
692 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
694 struct drm_fb_helper
*fb_helper
= info
->par
;
695 struct drm_device
*dev
= fb_helper
->dev
;
696 struct drm_crtc_helper_funcs
*crtc_funcs
;
697 u16
*red
, *green
, *blue
, *transp
;
698 struct drm_crtc
*crtc
;
702 drm_modeset_lock_all(dev
);
703 if (!drm_fb_helper_is_bound(fb_helper
)) {
704 drm_modeset_unlock_all(dev
);
708 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
709 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
710 crtc_funcs
= crtc
->helper_private
;
715 transp
= cmap
->transp
;
718 for (j
= 0; j
< cmap
->len
; j
++) {
719 u16 hred
, hgreen
, hblue
, htransp
= 0xffff;
728 rc
= setcolreg(crtc
, hred
, hgreen
, hblue
, start
++, info
);
732 if (crtc_funcs
->load_lut
)
733 crtc_funcs
->load_lut(crtc
);
736 drm_modeset_unlock_all(dev
);
739 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
742 * drm_fb_helper_check_var - implementation for ->fb_check_var
743 * @var: screeninfo to check
744 * @info: fbdev registered by the helper
746 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
747 struct fb_info
*info
)
749 struct drm_fb_helper
*fb_helper
= info
->par
;
750 struct drm_framebuffer
*fb
= fb_helper
->fb
;
753 if (var
->pixclock
!= 0 || in_dbg_master())
756 /* Need to resize the fb object !!! */
757 if (var
->bits_per_pixel
> fb
->bits_per_pixel
||
758 var
->xres
> fb
->width
|| var
->yres
> fb
->height
||
759 var
->xres_virtual
> fb
->width
|| var
->yres_virtual
> fb
->height
) {
760 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
761 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
762 var
->xres
, var
->yres
, var
->bits_per_pixel
,
763 var
->xres_virtual
, var
->yres_virtual
,
764 fb
->width
, fb
->height
, fb
->bits_per_pixel
);
768 switch (var
->bits_per_pixel
) {
770 depth
= (var
->green
.length
== 6) ? 16 : 15;
773 depth
= (var
->transp
.length
> 0) ? 32 : 24;
776 depth
= var
->bits_per_pixel
;
783 var
->green
.offset
= 0;
784 var
->blue
.offset
= 0;
786 var
->green
.length
= 8;
787 var
->blue
.length
= 8;
788 var
->transp
.length
= 0;
789 var
->transp
.offset
= 0;
792 var
->red
.offset
= 10;
793 var
->green
.offset
= 5;
794 var
->blue
.offset
= 0;
796 var
->green
.length
= 5;
797 var
->blue
.length
= 5;
798 var
->transp
.length
= 1;
799 var
->transp
.offset
= 15;
802 var
->red
.offset
= 11;
803 var
->green
.offset
= 5;
804 var
->blue
.offset
= 0;
806 var
->green
.length
= 6;
807 var
->blue
.length
= 5;
808 var
->transp
.length
= 0;
809 var
->transp
.offset
= 0;
812 var
->red
.offset
= 16;
813 var
->green
.offset
= 8;
814 var
->blue
.offset
= 0;
816 var
->green
.length
= 8;
817 var
->blue
.length
= 8;
818 var
->transp
.length
= 0;
819 var
->transp
.offset
= 0;
822 var
->red
.offset
= 16;
823 var
->green
.offset
= 8;
824 var
->blue
.offset
= 0;
826 var
->green
.length
= 8;
827 var
->blue
.length
= 8;
828 var
->transp
.length
= 8;
829 var
->transp
.offset
= 24;
836 EXPORT_SYMBOL(drm_fb_helper_check_var
);
839 * drm_fb_helper_set_par - implementation for ->fb_set_par
840 * @info: fbdev registered by the helper
842 * This will let fbcon do the mode init and is called at initialization time by
843 * the fbdev core when registering the driver, and later on through the hotplug
846 int drm_fb_helper_set_par(struct fb_info
*info
)
848 struct drm_fb_helper
*fb_helper
= info
->par
;
849 struct fb_var_screeninfo
*var
= &info
->var
;
851 if (var
->pixclock
!= 0) {
852 DRM_ERROR("PIXEL CLOCK SET\n");
856 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper
);
858 if (fb_helper
->delayed_hotplug
) {
859 fb_helper
->delayed_hotplug
= false;
860 drm_fb_helper_hotplug_event(fb_helper
);
864 EXPORT_SYMBOL(drm_fb_helper_set_par
);
867 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
868 * @var: updated screen information
869 * @info: fbdev registered by the helper
871 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
872 struct fb_info
*info
)
874 struct drm_fb_helper
*fb_helper
= info
->par
;
875 struct drm_device
*dev
= fb_helper
->dev
;
876 struct drm_mode_set
*modeset
;
880 drm_modeset_lock_all(dev
);
881 if (!drm_fb_helper_is_bound(fb_helper
)) {
882 drm_modeset_unlock_all(dev
);
886 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
887 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
889 modeset
->x
= var
->xoffset
;
890 modeset
->y
= var
->yoffset
;
892 if (modeset
->num_connectors
) {
893 ret
= drm_mode_set_config_internal(modeset
);
895 info
->var
.xoffset
= var
->xoffset
;
896 info
->var
.yoffset
= var
->yoffset
;
900 drm_modeset_unlock_all(dev
);
903 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
906 * Allocates the backing storage and sets up the fbdev info structure through
907 * the ->fb_probe callback and then registers the fbdev and sets up the panic
910 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
916 struct fb_info
*info
;
917 struct drm_fb_helper_surface_size sizes
;
920 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
921 sizes
.surface_depth
= 24;
922 sizes
.surface_bpp
= 32;
923 sizes
.fb_width
= (unsigned)-1;
924 sizes
.fb_height
= (unsigned)-1;
926 /* if driver picks 8 or 16 by default use that
927 for both depth/bpp */
928 if (preferred_bpp
!= sizes
.surface_bpp
)
929 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
931 /* first up get a count of crtcs now in use and new min/maxes width/heights */
932 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
933 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
934 struct drm_cmdline_mode
*cmdline_mode
;
936 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
938 if (cmdline_mode
->bpp_specified
) {
939 switch (cmdline_mode
->bpp
) {
941 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
944 sizes
.surface_depth
= 15;
945 sizes
.surface_bpp
= 16;
948 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
951 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
954 sizes
.surface_depth
= 24;
955 sizes
.surface_bpp
= 32;
963 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
964 struct drm_display_mode
*desired_mode
;
965 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
969 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
970 if (desired_mode
->hdisplay
< sizes
.fb_width
)
971 sizes
.fb_width
= desired_mode
->hdisplay
;
972 if (desired_mode
->vdisplay
< sizes
.fb_height
)
973 sizes
.fb_height
= desired_mode
->vdisplay
;
974 if (desired_mode
->hdisplay
> sizes
.surface_width
)
975 sizes
.surface_width
= desired_mode
->hdisplay
;
976 if (desired_mode
->vdisplay
> sizes
.surface_height
)
977 sizes
.surface_height
= desired_mode
->vdisplay
;
982 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
983 /* hmm everyone went away - assume VGA cable just fell out
984 and will come back later. */
985 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
986 sizes
.fb_width
= sizes
.surface_width
= 1024;
987 sizes
.fb_height
= sizes
.surface_height
= 768;
990 /* push down into drivers */
991 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
995 info
= fb_helper
->fbdev
;
998 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
999 * events, but at init time drm_setup_crtcs needs to be called before
1000 * the fb is allocated (since we need to figure out the desired size of
1001 * the fb before we can allocate it ...). Hence we need to fix things up
1004 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
1005 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
1006 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
1009 info
->var
.pixclock
= 0;
1010 if (register_framebuffer(info
) < 0)
1013 dev_info(fb_helper
->dev
->dev
, "fb%d: %s frame buffer device\n",
1014 info
->node
, info
->fix
.id
);
1016 /* Switch back to kernel console on panic */
1017 /* multi card linked list maybe */
1018 if (list_empty(&kernel_fb_helper_list
)) {
1019 dev_info(fb_helper
->dev
->dev
, "registered panic notifier\n");
1020 atomic_notifier_chain_register(&panic_notifier_list
,
1022 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
1025 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
1031 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1032 * @info: fbdev registered by the helper
1033 * @pitch: desired pitch
1034 * @depth: desired depth
1036 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1037 * fbdev emulations. Drivers which support acceleration methods which impose
1038 * additional constraints need to set up their own limits.
1040 * Drivers should call this (or their equivalent setup code) from their
1041 * ->fb_probe callback.
1043 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1046 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1047 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1048 FB_VISUAL_TRUECOLOR
;
1049 info
->fix
.mmio_start
= 0;
1050 info
->fix
.mmio_len
= 0;
1051 info
->fix
.type_aux
= 0;
1052 info
->fix
.xpanstep
= 1; /* doing it in hw */
1053 info
->fix
.ypanstep
= 1; /* doing it in hw */
1054 info
->fix
.ywrapstep
= 0;
1055 info
->fix
.accel
= FB_ACCEL_NONE
;
1057 info
->fix
.line_length
= pitch
;
1060 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1063 * drm_fb_helper_fill_var - initalizes variable fbdev information
1064 * @info: fbdev instance to set up
1065 * @fb_helper: fb helper instance to use as template
1066 * @fb_width: desired fb width
1067 * @fb_height: desired fb height
1069 * Sets up the variable fbdev metainformation from the given fb helper instance
1070 * and the drm framebuffer allocated in fb_helper->fb.
1072 * Drivers should call this (or their equivalent setup code) from their
1073 * ->fb_probe callback after having allocated the fbdev backing
1074 * storage framebuffer.
1076 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1077 uint32_t fb_width
, uint32_t fb_height
)
1079 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1080 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1081 info
->var
.xres_virtual
= fb
->width
;
1082 info
->var
.yres_virtual
= fb
->height
;
1083 info
->var
.bits_per_pixel
= fb
->bits_per_pixel
;
1084 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1085 info
->var
.xoffset
= 0;
1086 info
->var
.yoffset
= 0;
1087 info
->var
.activate
= FB_ACTIVATE_NOW
;
1088 info
->var
.height
= -1;
1089 info
->var
.width
= -1;
1091 switch (fb
->depth
) {
1093 info
->var
.red
.offset
= 0;
1094 info
->var
.green
.offset
= 0;
1095 info
->var
.blue
.offset
= 0;
1096 info
->var
.red
.length
= 8; /* 8bit DAC */
1097 info
->var
.green
.length
= 8;
1098 info
->var
.blue
.length
= 8;
1099 info
->var
.transp
.offset
= 0;
1100 info
->var
.transp
.length
= 0;
1103 info
->var
.red
.offset
= 10;
1104 info
->var
.green
.offset
= 5;
1105 info
->var
.blue
.offset
= 0;
1106 info
->var
.red
.length
= 5;
1107 info
->var
.green
.length
= 5;
1108 info
->var
.blue
.length
= 5;
1109 info
->var
.transp
.offset
= 15;
1110 info
->var
.transp
.length
= 1;
1113 info
->var
.red
.offset
= 11;
1114 info
->var
.green
.offset
= 5;
1115 info
->var
.blue
.offset
= 0;
1116 info
->var
.red
.length
= 5;
1117 info
->var
.green
.length
= 6;
1118 info
->var
.blue
.length
= 5;
1119 info
->var
.transp
.offset
= 0;
1122 info
->var
.red
.offset
= 16;
1123 info
->var
.green
.offset
= 8;
1124 info
->var
.blue
.offset
= 0;
1125 info
->var
.red
.length
= 8;
1126 info
->var
.green
.length
= 8;
1127 info
->var
.blue
.length
= 8;
1128 info
->var
.transp
.offset
= 0;
1129 info
->var
.transp
.length
= 0;
1132 info
->var
.red
.offset
= 16;
1133 info
->var
.green
.offset
= 8;
1134 info
->var
.blue
.offset
= 0;
1135 info
->var
.red
.length
= 8;
1136 info
->var
.green
.length
= 8;
1137 info
->var
.blue
.length
= 8;
1138 info
->var
.transp
.offset
= 24;
1139 info
->var
.transp
.length
= 8;
1145 info
->var
.xres
= fb_width
;
1146 info
->var
.yres
= fb_height
;
1148 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1150 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1154 struct drm_connector
*connector
;
1158 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1159 connector
= fb_helper
->connector_info
[i
]->connector
;
1160 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1166 struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1168 struct drm_display_mode
*mode
;
1170 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1171 if (mode
->hdisplay
> width
||
1172 mode
->vdisplay
> height
)
1174 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1179 EXPORT_SYMBOL(drm_has_preferred_mode
);
1181 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1183 struct drm_cmdline_mode
*cmdline_mode
;
1184 cmdline_mode
= &fb_connector
->cmdline_mode
;
1185 return cmdline_mode
->specified
;
1188 struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
,
1189 int width
, int height
)
1191 struct drm_cmdline_mode
*cmdline_mode
;
1192 struct drm_display_mode
*mode
= NULL
;
1193 bool prefer_non_interlace
;
1195 cmdline_mode
= &fb_helper_conn
->cmdline_mode
;
1196 if (cmdline_mode
->specified
== false)
1199 /* attempt to find a matching mode in the list of modes
1200 * we have gotten so far, if not add a CVT mode that conforms
1202 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1205 prefer_non_interlace
= !cmdline_mode
->interlace
;
1207 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1208 /* check width/height */
1209 if (mode
->hdisplay
!= cmdline_mode
->xres
||
1210 mode
->vdisplay
!= cmdline_mode
->yres
)
1213 if (cmdline_mode
->refresh_specified
) {
1214 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
1218 if (cmdline_mode
->interlace
) {
1219 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
1221 } else if (prefer_non_interlace
) {
1222 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
1228 if (prefer_non_interlace
) {
1229 prefer_non_interlace
= false;
1234 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
1236 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
1239 EXPORT_SYMBOL(drm_pick_cmdline_mode
);
1241 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
1246 enable
= connector
->status
== connector_status_connected
;
1248 enable
= connector
->status
!= connector_status_disconnected
;
1253 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
1256 bool any_enabled
= false;
1257 struct drm_connector
*connector
;
1260 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1261 connector
= fb_helper
->connector_info
[i
]->connector
;
1262 enabled
[i
] = drm_connector_enabled(connector
, true);
1263 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
1264 enabled
[i
] ? "yes" : "no");
1265 any_enabled
|= enabled
[i
];
1271 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1272 connector
= fb_helper
->connector_info
[i
]->connector
;
1273 enabled
[i
] = drm_connector_enabled(connector
, false);
1277 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
1278 struct drm_display_mode
**modes
,
1279 bool *enabled
, int width
, int height
)
1282 bool can_clone
= false;
1283 struct drm_fb_helper_connector
*fb_helper_conn
;
1284 struct drm_display_mode
*dmt_mode
, *mode
;
1286 /* only contemplate cloning in the single crtc case */
1287 if (fb_helper
->crtc_count
> 1)
1291 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1296 /* only contemplate cloning if more than one connector is enabled */
1300 /* check the command line or if nothing common pick 1024x768 */
1302 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1305 fb_helper_conn
= fb_helper
->connector_info
[i
];
1306 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1311 for (j
= 0; j
< i
; j
++) {
1314 if (!drm_mode_equal(modes
[j
], modes
[i
]))
1320 DRM_DEBUG_KMS("can clone using command line\n");
1324 /* try and find a 1024x768 mode on each connector */
1326 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
1328 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1333 fb_helper_conn
= fb_helper
->connector_info
[i
];
1334 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1335 if (drm_mode_equal(mode
, dmt_mode
))
1343 DRM_DEBUG_KMS("can clone using 1024x768\n");
1346 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1350 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
1351 struct drm_display_mode
**modes
,
1352 bool *enabled
, int width
, int height
)
1354 struct drm_fb_helper_connector
*fb_helper_conn
;
1357 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1358 fb_helper_conn
= fb_helper
->connector_info
[i
];
1360 if (enabled
[i
] == false)
1363 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1364 fb_helper_conn
->connector
->base
.id
);
1366 /* got for command line mode first */
1367 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1369 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1370 fb_helper_conn
->connector
->base
.id
);
1371 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
1373 /* No preferred modes, pick one off the list */
1374 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
1375 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
1378 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
1384 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
1385 struct drm_fb_helper_crtc
**best_crtcs
,
1386 struct drm_display_mode
**modes
,
1387 int n
, int width
, int height
)
1390 struct drm_device
*dev
= fb_helper
->dev
;
1391 struct drm_connector
*connector
;
1392 struct drm_connector_helper_funcs
*connector_funcs
;
1393 struct drm_encoder
*encoder
;
1394 int my_score
, best_score
, score
;
1395 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
1396 struct drm_fb_helper_connector
*fb_helper_conn
;
1398 if (n
== fb_helper
->connector_count
)
1401 fb_helper_conn
= fb_helper
->connector_info
[n
];
1402 connector
= fb_helper_conn
->connector
;
1404 best_crtcs
[n
] = NULL
;
1405 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
1406 if (modes
[n
] == NULL
)
1409 crtcs
= kzalloc(dev
->mode_config
.num_connector
*
1410 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1415 if (connector
->status
== connector_status_connected
)
1417 if (drm_has_cmdline_mode(fb_helper_conn
))
1419 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
1422 connector_funcs
= connector
->helper_private
;
1423 encoder
= connector_funcs
->best_encoder(connector
);
1427 /* select a crtc for this connector and then attempt to configure
1428 remaining connectors */
1429 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
1430 crtc
= &fb_helper
->crtc_info
[c
];
1432 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
1435 for (o
= 0; o
< n
; o
++)
1436 if (best_crtcs
[o
] == crtc
)
1440 /* ignore cloning unless only a single crtc */
1441 if (fb_helper
->crtc_count
> 1)
1444 if (!drm_mode_equal(modes
[o
], modes
[n
]))
1449 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
1450 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
1452 if (score
> best_score
) {
1454 memcpy(best_crtcs
, crtcs
,
1455 dev
->mode_config
.num_connector
*
1456 sizeof(struct drm_fb_helper_crtc
*));
1464 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
)
1466 struct drm_device
*dev
= fb_helper
->dev
;
1467 struct drm_fb_helper_crtc
**crtcs
;
1468 struct drm_display_mode
**modes
;
1469 struct drm_mode_set
*modeset
;
1474 DRM_DEBUG_KMS("\n");
1476 width
= dev
->mode_config
.max_width
;
1477 height
= dev
->mode_config
.max_height
;
1479 crtcs
= kcalloc(dev
->mode_config
.num_connector
,
1480 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1481 modes
= kcalloc(dev
->mode_config
.num_connector
,
1482 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
1483 enabled
= kcalloc(dev
->mode_config
.num_connector
,
1484 sizeof(bool), GFP_KERNEL
);
1485 if (!crtcs
|| !modes
|| !enabled
) {
1486 DRM_ERROR("Memory allocation failed\n");
1491 drm_enable_connectors(fb_helper
, enabled
);
1493 if (!(fb_helper
->funcs
->initial_config
&&
1494 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
1495 enabled
, width
, height
))) {
1496 memset(modes
, 0, dev
->mode_config
.num_connector
*sizeof(modes
[0]));
1497 memset(crtcs
, 0, dev
->mode_config
.num_connector
*sizeof(crtcs
[0]));
1499 if (!drm_target_cloned(fb_helper
,
1500 modes
, enabled
, width
, height
) &&
1501 !drm_target_preferred(fb_helper
,
1502 modes
, enabled
, width
, height
))
1503 DRM_ERROR("Unable to find initial modes\n");
1505 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1508 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
1511 /* need to set the modesets up here for use later */
1512 /* fill out the connector<->crtc mappings into the modesets */
1513 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1514 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1515 modeset
->num_connectors
= 0;
1519 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1520 struct drm_display_mode
*mode
= modes
[i
];
1521 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
1522 modeset
= &fb_crtc
->mode_set
;
1524 if (mode
&& fb_crtc
) {
1525 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1526 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
);
1527 fb_crtc
->desired_mode
= mode
;
1529 drm_mode_destroy(dev
, modeset
->mode
);
1530 modeset
->mode
= drm_mode_duplicate(dev
,
1531 fb_crtc
->desired_mode
);
1532 modeset
->connectors
[modeset
->num_connectors
++] = fb_helper
->connector_info
[i
]->connector
;
1533 modeset
->fb
= fb_helper
->fb
;
1537 /* Clear out any old modes if there are no more connected outputs. */
1538 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1539 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1540 if (modeset
->num_connectors
== 0) {
1541 BUG_ON(modeset
->fb
);
1542 BUG_ON(modeset
->num_connectors
);
1544 drm_mode_destroy(dev
, modeset
->mode
);
1545 modeset
->mode
= NULL
;
1555 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1556 * @fb_helper: fb_helper device struct
1557 * @bpp_sel: bpp value to use for the framebuffer configuration
1559 * Scans the CRTCs and connectors and tries to put together an initial setup.
1560 * At the moment, this is a cloned configuration across all heads with
1561 * a new framebuffer object as the backing store.
1563 * Note that this also registers the fbdev and so allows userspace to call into
1564 * the driver through the fbdev interfaces.
1566 * This function will call down into the ->fb_probe callback to let
1567 * the driver allocate and initialize the fbdev info structure and the drm
1568 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1569 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1570 * values for the fbdev info structure.
1573 * Zero if everything went ok, nonzero otherwise.
1575 bool drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
1577 struct drm_device
*dev
= fb_helper
->dev
;
1580 drm_fb_helper_parse_command_line(fb_helper
);
1582 mutex_lock(&dev
->mode_config
.mutex
);
1583 count
= drm_fb_helper_probe_connector_modes(fb_helper
,
1584 dev
->mode_config
.max_width
,
1585 dev
->mode_config
.max_height
);
1586 mutex_unlock(&dev
->mode_config
.mutex
);
1588 * we shouldn't end up with no modes here.
1591 dev_info(fb_helper
->dev
->dev
, "No connectors reported connected with modes\n");
1593 drm_setup_crtcs(fb_helper
);
1595 return drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
1597 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
1600 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1601 * probing all the outputs attached to the fb
1602 * @fb_helper: the drm_fb_helper
1604 * Scan the connectors attached to the fb_helper and try to put together a
1605 * setup after *notification of a change in output configuration.
1607 * Called at runtime, takes the mode config locks to be able to check/change the
1608 * modeset configuration. Must be run from process context (which usually means
1609 * either the output polling work or a work item launched from the driver's
1610 * hotplug interrupt).
1612 * Note that the driver must ensure that this is only called _after_ the fb has
1613 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1616 * 0 on success and a non-zero error code otherwise.
1618 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
1620 struct drm_device
*dev
= fb_helper
->dev
;
1621 u32 max_width
, max_height
;
1626 mutex_lock(&fb_helper
->dev
->mode_config
.mutex
);
1627 if (!drm_fb_helper_is_bound(fb_helper
)) {
1628 fb_helper
->delayed_hotplug
= true;
1629 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1632 DRM_DEBUG_KMS("\n");
1634 max_width
= fb_helper
->fb
->width
;
1635 max_height
= fb_helper
->fb
->height
;
1637 drm_fb_helper_probe_connector_modes(fb_helper
, max_width
, max_height
);
1638 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1640 drm_modeset_lock_all(dev
);
1641 drm_setup_crtcs(fb_helper
);
1642 drm_modeset_unlock_all(dev
);
1643 drm_fb_helper_set_par(fb_helper
->fbdev
);
1647 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
1649 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1650 * but the module doesn't depend on any fb console symbols. At least
1651 * attempt to load fbcon to avoid leaving the system without a usable console.
1653 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1654 static int __init
drm_fb_helper_modinit(void)
1656 const char *name
= "fbcon";
1657 struct module
*fbcon
;
1659 mutex_lock(&module_mutex
);
1660 fbcon
= find_module(name
);
1661 mutex_unlock(&module_mutex
);
1664 request_module_nowait(name
);
1668 module_init(drm_fb_helper_modinit
);