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 four-step process with drm_fb_helper_prepare(),
53 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
54 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
55 * default behaviour can override the third step with their own code.
56 * Teardown is done with drm_fb_helper_fini().
58 * At runtime drivers should restore the fbdev console by calling
59 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
60 * should also notify the fb helper code from updates to the output
61 * configuration by calling drm_fb_helper_hotplug_event(). For easier
62 * integration with the output polling code in drm_crtc_helper.c the modeset
63 * code provides a ->output_poll_changed callback.
65 * All other functions exported by the fb helper library can be used to
66 * implement the fbdev driver interface by the driver.
68 * It is possible, though perhaps somewhat tricky, to implement race-free
69 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
70 * helper must be called first to initialize the minimum required to make
71 * hotplug detection work. Drivers also need to make sure to properly set up
72 * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
73 * it is safe to enable interrupts and start processing hotplug events. At the
74 * same time, drivers should initialize all modeset objects such as CRTCs,
75 * encoders and connectors. To finish up the fbdev helper initialization, the
76 * drm_fb_helper_init() function is called. To probe for all attached displays
77 * and set up an initial configuration using the detected hardware, drivers
78 * should call drm_fb_helper_single_add_all_connectors() followed by
79 * drm_fb_helper_initial_config().
83 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
85 * @fb_helper: fbdev initialized with drm_fb_helper_init
87 * This functions adds all the available connectors for use with the given
88 * fb_helper. This is a separate step to allow drivers to freely assign
89 * connectors to the fbdev, e.g. if some are reserved for special purposes or
90 * not adequate to be used for the fbcon.
92 * Since this is part of the initial setup before the fbdev is published, no
93 * locking is required.
95 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper
*fb_helper
)
97 struct drm_device
*dev
= fb_helper
->dev
;
98 struct drm_connector
*connector
;
101 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
102 struct drm_fb_helper_connector
*fb_helper_connector
;
104 fb_helper_connector
= kzalloc(sizeof(struct drm_fb_helper_connector
), GFP_KERNEL
);
105 if (!fb_helper_connector
)
108 fb_helper_connector
->connector
= connector
;
109 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_helper_connector
;
113 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
114 kfree(fb_helper
->connector_info
[i
]);
115 fb_helper
->connector_info
[i
] = NULL
;
117 fb_helper
->connector_count
= 0;
120 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors
);
122 int drm_fb_helper_add_one_connector(struct drm_fb_helper
*fb_helper
, struct drm_connector
*connector
)
124 struct drm_fb_helper_connector
**temp
;
125 struct drm_fb_helper_connector
*fb_helper_connector
;
127 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
128 if (fb_helper
->connector_count
+ 1 > fb_helper
->connector_info_alloc_count
) {
129 temp
= krealloc(fb_helper
->connector_info
, sizeof(struct drm_fb_helper_connector
*) * (fb_helper
->connector_count
+ 1), GFP_KERNEL
);
133 fb_helper
->connector_info_alloc_count
= fb_helper
->connector_count
+ 1;
134 fb_helper
->connector_info
= temp
;
138 fb_helper_connector
= kzalloc(sizeof(struct drm_fb_helper_connector
), GFP_KERNEL
);
139 if (!fb_helper_connector
)
142 fb_helper_connector
->connector
= connector
;
143 fb_helper
->connector_info
[fb_helper
->connector_count
++] = fb_helper_connector
;
146 EXPORT_SYMBOL(drm_fb_helper_add_one_connector
);
148 int drm_fb_helper_remove_one_connector(struct drm_fb_helper
*fb_helper
,
149 struct drm_connector
*connector
)
151 struct drm_fb_helper_connector
*fb_helper_connector
;
154 WARN_ON(!mutex_is_locked(&fb_helper
->dev
->mode_config
.mutex
));
156 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
157 if (fb_helper
->connector_info
[i
]->connector
== connector
)
161 if (i
== fb_helper
->connector_count
)
163 fb_helper_connector
= fb_helper
->connector_info
[i
];
165 for (j
= i
+ 1; j
< fb_helper
->connector_count
; j
++) {
166 fb_helper
->connector_info
[j
- 1] = fb_helper
->connector_info
[j
];
168 fb_helper
->connector_count
--;
169 kfree(fb_helper_connector
);
172 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector
);
174 static void drm_fb_helper_save_lut_atomic(struct drm_crtc
*crtc
, struct drm_fb_helper
*helper
)
176 uint16_t *r_base
, *g_base
, *b_base
;
179 if (helper
->funcs
->gamma_get
== NULL
)
182 r_base
= crtc
->gamma_store
;
183 g_base
= r_base
+ crtc
->gamma_size
;
184 b_base
= g_base
+ crtc
->gamma_size
;
186 for (i
= 0; i
< crtc
->gamma_size
; i
++)
187 helper
->funcs
->gamma_get(crtc
, &r_base
[i
], &g_base
[i
], &b_base
[i
], i
);
190 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc
*crtc
)
192 uint16_t *r_base
, *g_base
, *b_base
;
194 if (crtc
->funcs
->gamma_set
== NULL
)
197 r_base
= crtc
->gamma_store
;
198 g_base
= r_base
+ crtc
->gamma_size
;
199 b_base
= g_base
+ crtc
->gamma_size
;
201 crtc
->funcs
->gamma_set(crtc
, r_base
, g_base
, b_base
, 0, crtc
->gamma_size
);
205 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
206 * @info: fbdev registered by the helper
208 int drm_fb_helper_debug_enter(struct fb_info
*info
)
210 struct drm_fb_helper
*helper
= info
->par
;
211 struct drm_crtc_helper_funcs
*funcs
;
214 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
215 for (i
= 0; i
< helper
->crtc_count
; i
++) {
216 struct drm_mode_set
*mode_set
=
217 &helper
->crtc_info
[i
].mode_set
;
219 if (!mode_set
->crtc
->enabled
)
222 funcs
= mode_set
->crtc
->helper_private
;
223 drm_fb_helper_save_lut_atomic(mode_set
->crtc
, helper
);
224 funcs
->mode_set_base_atomic(mode_set
->crtc
,
228 ENTER_ATOMIC_MODE_SET
);
234 EXPORT_SYMBOL(drm_fb_helper_debug_enter
);
236 /* Find the real fb for a given fb helper CRTC */
237 static struct drm_framebuffer
*drm_mode_config_fb(struct drm_crtc
*crtc
)
239 struct drm_device
*dev
= crtc
->dev
;
242 list_for_each_entry(c
, &dev
->mode_config
.crtc_list
, head
) {
243 if (crtc
->base
.id
== c
->base
.id
)
244 return c
->primary
->fb
;
251 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
252 * @info: fbdev registered by the helper
254 int drm_fb_helper_debug_leave(struct fb_info
*info
)
256 struct drm_fb_helper
*helper
= info
->par
;
257 struct drm_crtc
*crtc
;
258 struct drm_crtc_helper_funcs
*funcs
;
259 struct drm_framebuffer
*fb
;
262 for (i
= 0; i
< helper
->crtc_count
; i
++) {
263 struct drm_mode_set
*mode_set
= &helper
->crtc_info
[i
].mode_set
;
264 crtc
= mode_set
->crtc
;
265 funcs
= crtc
->helper_private
;
266 fb
= drm_mode_config_fb(crtc
);
272 DRM_ERROR("no fb to restore??\n");
276 drm_fb_helper_restore_lut_atomic(mode_set
->crtc
);
277 funcs
->mode_set_base_atomic(mode_set
->crtc
, fb
, crtc
->x
,
278 crtc
->y
, LEAVE_ATOMIC_MODE_SET
);
283 EXPORT_SYMBOL(drm_fb_helper_debug_leave
);
285 static bool restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
287 struct drm_device
*dev
= fb_helper
->dev
;
288 struct drm_plane
*plane
;
292 drm_warn_on_modeset_not_all_locked(dev
);
294 list_for_each_entry(plane
, &dev
->mode_config
.plane_list
, head
) {
295 if (plane
->type
!= DRM_PLANE_TYPE_PRIMARY
)
296 drm_plane_force_disable(plane
);
298 if (dev
->mode_config
.rotation_property
) {
299 drm_mode_plane_set_obj_prop(plane
,
300 dev
->mode_config
.rotation_property
,
305 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
306 struct drm_mode_set
*mode_set
= &fb_helper
->crtc_info
[i
].mode_set
;
307 struct drm_crtc
*crtc
= mode_set
->crtc
;
310 if (crtc
->funcs
->cursor_set
) {
311 ret
= crtc
->funcs
->cursor_set(crtc
, NULL
, 0, 0, 0);
316 ret
= drm_mode_set_config_internal(mode_set
);
323 * drm_fb_helper_restore_fbdev_mode - 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 * Use this variant if you need to bypass locking (panic), or already
331 * hold all modeset locks. Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
333 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper
*fb_helper
)
335 return restore_fbdev_mode(fb_helper
);
339 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
340 * @fb_helper: fbcon to restore
342 * This should be called from driver's drm ->lastclose callback
343 * when implementing an fbcon on top of kms using this helper. This ensures that
344 * the user isn't greeted with a black screen when e.g. X dies.
346 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper
*fb_helper
)
348 struct drm_device
*dev
= fb_helper
->dev
;
350 drm_modeset_lock_all(dev
);
351 ret
= restore_fbdev_mode(fb_helper
);
352 drm_modeset_unlock_all(dev
);
355 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked
);
358 * restore fbcon display for all kms driver's using this helper, used for sysrq
359 * and panic handling.
361 static bool drm_fb_helper_force_kernel_mode(void)
363 bool ret
, error
= false;
364 struct drm_fb_helper
*helper
;
366 if (list_empty(&kernel_fb_helper_list
))
369 list_for_each_entry(helper
, &kernel_fb_helper_list
, kernel_fb_list
) {
370 struct drm_device
*dev
= helper
->dev
;
372 if (dev
->switch_power_state
== DRM_SWITCH_POWER_OFF
)
376 * NOTE: Use trylock mode to avoid deadlocks and sleeping in
379 if (__drm_modeset_lock_all(dev
, true) != 0) {
384 ret
= drm_fb_helper_restore_fbdev_mode(helper
);
388 drm_modeset_unlock_all(dev
);
393 static int drm_fb_helper_panic(struct notifier_block
*n
, unsigned long ununsed
,
397 * It's a waste of time and effort to switch back to text console
398 * if the kernel should reboot before panic messages can be seen.
400 if (panic_timeout
< 0)
403 pr_err("panic occurred, switching back to text console\n");
404 return drm_fb_helper_force_kernel_mode();
407 static struct notifier_block paniced
= {
408 .notifier_call
= drm_fb_helper_panic
,
411 static bool drm_fb_helper_is_bound(struct drm_fb_helper
*fb_helper
)
413 struct drm_device
*dev
= fb_helper
->dev
;
414 struct drm_crtc
*crtc
;
415 int bound
= 0, crtcs_bound
= 0;
417 /* Sometimes user space wants everything disabled, so don't steal the
418 * display if there's a master. */
419 if (dev
->primary
->master
)
422 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
423 if (crtc
->primary
->fb
)
425 if (crtc
->primary
->fb
== fb_helper
->fb
)
429 if (bound
< crtcs_bound
)
435 #ifdef CONFIG_MAGIC_SYSRQ
436 static void drm_fb_helper_restore_work_fn(struct work_struct
*ignored
)
439 ret
= drm_fb_helper_force_kernel_mode();
441 DRM_ERROR("Failed to restore crtc configuration\n");
443 static DECLARE_WORK(drm_fb_helper_restore_work
, drm_fb_helper_restore_work_fn
);
445 static void drm_fb_helper_sysrq(int dummy1
)
447 schedule_work(&drm_fb_helper_restore_work
);
450 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= {
451 .handler
= drm_fb_helper_sysrq
,
452 .help_msg
= "force-fb(V)",
453 .action_msg
= "Restore framebuffer console",
456 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op
= { };
459 static void drm_fb_helper_dpms(struct fb_info
*info
, int dpms_mode
)
461 struct drm_fb_helper
*fb_helper
= info
->par
;
462 struct drm_device
*dev
= fb_helper
->dev
;
463 struct drm_crtc
*crtc
;
464 struct drm_connector
*connector
;
468 * fbdev->blank can be called from irq context in case of a panic.
469 * Since we already have our own special panic handler which will
470 * restore the fbdev console mode completely, just bail out early.
472 if (oops_in_progress
)
476 * For each CRTC in this fb, turn the connectors on/off.
478 drm_modeset_lock_all(dev
);
479 if (!drm_fb_helper_is_bound(fb_helper
)) {
480 drm_modeset_unlock_all(dev
);
484 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
485 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
490 /* Walk the connectors & encoders on this fb turning them on/off */
491 for (j
= 0; j
< fb_helper
->connector_count
; j
++) {
492 connector
= fb_helper
->connector_info
[j
]->connector
;
493 connector
->funcs
->dpms(connector
, dpms_mode
);
494 drm_object_property_set_value(&connector
->base
,
495 dev
->mode_config
.dpms_property
, dpms_mode
);
498 drm_modeset_unlock_all(dev
);
502 * drm_fb_helper_blank - implementation for ->fb_blank
503 * @blank: desired blanking state
504 * @info: fbdev registered by the helper
506 int drm_fb_helper_blank(int blank
, struct fb_info
*info
)
509 /* Display: On; HSync: On, VSync: On */
510 case FB_BLANK_UNBLANK
:
511 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_ON
);
513 /* Display: Off; HSync: On, VSync: On */
514 case FB_BLANK_NORMAL
:
515 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
517 /* Display: Off; HSync: Off, VSync: On */
518 case FB_BLANK_HSYNC_SUSPEND
:
519 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_STANDBY
);
521 /* Display: Off; HSync: On, VSync: Off */
522 case FB_BLANK_VSYNC_SUSPEND
:
523 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_SUSPEND
);
525 /* Display: Off; HSync: Off, VSync: Off */
526 case FB_BLANK_POWERDOWN
:
527 drm_fb_helper_dpms(info
, DRM_MODE_DPMS_OFF
);
532 EXPORT_SYMBOL(drm_fb_helper_blank
);
534 static void drm_fb_helper_crtc_free(struct drm_fb_helper
*helper
)
538 for (i
= 0; i
< helper
->connector_count
; i
++)
539 kfree(helper
->connector_info
[i
]);
540 kfree(helper
->connector_info
);
541 for (i
= 0; i
< helper
->crtc_count
; i
++) {
542 kfree(helper
->crtc_info
[i
].mode_set
.connectors
);
543 if (helper
->crtc_info
[i
].mode_set
.mode
)
544 drm_mode_destroy(helper
->dev
, helper
->crtc_info
[i
].mode_set
.mode
);
546 kfree(helper
->crtc_info
);
550 * drm_fb_helper_prepare - setup a drm_fb_helper structure
552 * @helper: driver-allocated fbdev helper structure to set up
553 * @funcs: pointer to structure of functions associate with this helper
555 * Sets up the bare minimum to make the framebuffer helper usable. This is
556 * useful to implement race-free initialization of the polling helpers.
558 void drm_fb_helper_prepare(struct drm_device
*dev
, struct drm_fb_helper
*helper
,
559 const struct drm_fb_helper_funcs
*funcs
)
561 INIT_LIST_HEAD(&helper
->kernel_fb_list
);
562 helper
->funcs
= funcs
;
565 EXPORT_SYMBOL(drm_fb_helper_prepare
);
568 * drm_fb_helper_init - initialize a drm_fb_helper structure
570 * @fb_helper: driver-allocated fbdev helper structure to initialize
571 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
572 * @max_conn_count: max connector count
574 * This allocates the structures for the fbdev helper with the given limits.
575 * Note that this won't yet touch the hardware (through the driver interfaces)
576 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
577 * to allow driver writes more control over the exact init sequence.
579 * Drivers must call drm_fb_helper_prepare() before calling this function.
582 * Zero if everything went ok, nonzero otherwise.
584 int drm_fb_helper_init(struct drm_device
*dev
,
585 struct drm_fb_helper
*fb_helper
,
586 int crtc_count
, int max_conn_count
)
588 struct drm_crtc
*crtc
;
594 fb_helper
->crtc_info
= kcalloc(crtc_count
, sizeof(struct drm_fb_helper_crtc
), GFP_KERNEL
);
595 if (!fb_helper
->crtc_info
)
598 fb_helper
->crtc_count
= crtc_count
;
599 fb_helper
->connector_info
= kcalloc(dev
->mode_config
.num_connector
, sizeof(struct drm_fb_helper_connector
*), GFP_KERNEL
);
600 if (!fb_helper
->connector_info
) {
601 kfree(fb_helper
->crtc_info
);
604 fb_helper
->connector_info_alloc_count
= dev
->mode_config
.num_connector
;
605 fb_helper
->connector_count
= 0;
607 for (i
= 0; i
< crtc_count
; i
++) {
608 fb_helper
->crtc_info
[i
].mode_set
.connectors
=
609 kcalloc(max_conn_count
,
610 sizeof(struct drm_connector
*),
613 if (!fb_helper
->crtc_info
[i
].mode_set
.connectors
)
615 fb_helper
->crtc_info
[i
].mode_set
.num_connectors
= 0;
619 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
620 fb_helper
->crtc_info
[i
].mode_set
.crtc
= crtc
;
626 drm_fb_helper_crtc_free(fb_helper
);
629 EXPORT_SYMBOL(drm_fb_helper_init
);
631 void drm_fb_helper_fini(struct drm_fb_helper
*fb_helper
)
633 if (!list_empty(&fb_helper
->kernel_fb_list
)) {
634 list_del(&fb_helper
->kernel_fb_list
);
635 if (list_empty(&kernel_fb_helper_list
)) {
636 pr_info("drm: unregistered panic notifier\n");
637 atomic_notifier_chain_unregister(&panic_notifier_list
,
639 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
643 drm_fb_helper_crtc_free(fb_helper
);
646 EXPORT_SYMBOL(drm_fb_helper_fini
);
648 static int setcolreg(struct drm_crtc
*crtc
, u16 red
, u16 green
,
649 u16 blue
, u16 regno
, struct fb_info
*info
)
651 struct drm_fb_helper
*fb_helper
= info
->par
;
652 struct drm_framebuffer
*fb
= fb_helper
->fb
;
655 if (info
->fix
.visual
== FB_VISUAL_TRUECOLOR
) {
658 /* place color in psuedopalette */
661 palette
= (u32
*)info
->pseudo_palette
;
662 red
>>= (16 - info
->var
.red
.length
);
663 green
>>= (16 - info
->var
.green
.length
);
664 blue
>>= (16 - info
->var
.blue
.length
);
665 value
= (red
<< info
->var
.red
.offset
) |
666 (green
<< info
->var
.green
.offset
) |
667 (blue
<< info
->var
.blue
.offset
);
668 if (info
->var
.transp
.length
> 0) {
669 u32 mask
= (1 << info
->var
.transp
.length
) - 1;
670 mask
<<= info
->var
.transp
.offset
;
673 palette
[regno
] = value
;
678 * The driver really shouldn't advertise pseudo/directcolor
679 * visuals if it can't deal with the palette.
681 if (WARN_ON(!fb_helper
->funcs
->gamma_set
||
682 !fb_helper
->funcs
->gamma_get
))
687 if (fb
->bits_per_pixel
== 16) {
690 if (fb
->depth
== 16 && regno
> 63)
692 if (fb
->depth
== 15 && regno
> 31)
695 if (fb
->depth
== 16) {
699 for (i
= 0; i
< 8; i
++)
700 fb_helper
->funcs
->gamma_set(crtc
, red
,
701 green
, blue
, pindex
+ i
);
704 fb_helper
->funcs
->gamma_get(crtc
, &r
,
708 for (i
= 0; i
< 4; i
++)
709 fb_helper
->funcs
->gamma_set(crtc
, r
,
716 fb_helper
->funcs
->gamma_set(crtc
, red
, green
, blue
, pindex
);
721 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
723 * @info: fbdev registered by the helper
725 int drm_fb_helper_setcmap(struct fb_cmap
*cmap
, struct fb_info
*info
)
727 struct drm_fb_helper
*fb_helper
= info
->par
;
728 struct drm_device
*dev
= fb_helper
->dev
;
729 struct drm_crtc_helper_funcs
*crtc_funcs
;
730 u16
*red
, *green
, *blue
, *transp
;
731 struct drm_crtc
*crtc
;
735 drm_modeset_lock_all(dev
);
736 if (!drm_fb_helper_is_bound(fb_helper
)) {
737 drm_modeset_unlock_all(dev
);
741 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
742 crtc
= fb_helper
->crtc_info
[i
].mode_set
.crtc
;
743 crtc_funcs
= crtc
->helper_private
;
748 transp
= cmap
->transp
;
751 for (j
= 0; j
< cmap
->len
; j
++) {
752 u16 hred
, hgreen
, hblue
, htransp
= 0xffff;
761 rc
= setcolreg(crtc
, hred
, hgreen
, hblue
, start
++, info
);
765 if (crtc_funcs
->load_lut
)
766 crtc_funcs
->load_lut(crtc
);
769 drm_modeset_unlock_all(dev
);
772 EXPORT_SYMBOL(drm_fb_helper_setcmap
);
775 * drm_fb_helper_check_var - implementation for ->fb_check_var
776 * @var: screeninfo to check
777 * @info: fbdev registered by the helper
779 int drm_fb_helper_check_var(struct fb_var_screeninfo
*var
,
780 struct fb_info
*info
)
782 struct drm_fb_helper
*fb_helper
= info
->par
;
783 struct drm_framebuffer
*fb
= fb_helper
->fb
;
786 if (var
->pixclock
!= 0 || in_dbg_master())
789 /* Need to resize the fb object !!! */
790 if (var
->bits_per_pixel
> fb
->bits_per_pixel
||
791 var
->xres
> fb
->width
|| var
->yres
> fb
->height
||
792 var
->xres_virtual
> fb
->width
|| var
->yres_virtual
> fb
->height
) {
793 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
794 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
795 var
->xres
, var
->yres
, var
->bits_per_pixel
,
796 var
->xres_virtual
, var
->yres_virtual
,
797 fb
->width
, fb
->height
, fb
->bits_per_pixel
);
801 switch (var
->bits_per_pixel
) {
803 depth
= (var
->green
.length
== 6) ? 16 : 15;
806 depth
= (var
->transp
.length
> 0) ? 32 : 24;
809 depth
= var
->bits_per_pixel
;
816 var
->green
.offset
= 0;
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
= 10;
826 var
->green
.offset
= 5;
827 var
->blue
.offset
= 0;
829 var
->green
.length
= 5;
830 var
->blue
.length
= 5;
831 var
->transp
.length
= 1;
832 var
->transp
.offset
= 15;
835 var
->red
.offset
= 11;
836 var
->green
.offset
= 5;
837 var
->blue
.offset
= 0;
839 var
->green
.length
= 6;
840 var
->blue
.length
= 5;
841 var
->transp
.length
= 0;
842 var
->transp
.offset
= 0;
845 var
->red
.offset
= 16;
846 var
->green
.offset
= 8;
847 var
->blue
.offset
= 0;
849 var
->green
.length
= 8;
850 var
->blue
.length
= 8;
851 var
->transp
.length
= 0;
852 var
->transp
.offset
= 0;
855 var
->red
.offset
= 16;
856 var
->green
.offset
= 8;
857 var
->blue
.offset
= 0;
859 var
->green
.length
= 8;
860 var
->blue
.length
= 8;
861 var
->transp
.length
= 8;
862 var
->transp
.offset
= 24;
869 EXPORT_SYMBOL(drm_fb_helper_check_var
);
872 * drm_fb_helper_set_par - implementation for ->fb_set_par
873 * @info: fbdev registered by the helper
875 * This will let fbcon do the mode init and is called at initialization time by
876 * the fbdev core when registering the driver, and later on through the hotplug
879 int drm_fb_helper_set_par(struct fb_info
*info
)
881 struct drm_fb_helper
*fb_helper
= info
->par
;
882 struct fb_var_screeninfo
*var
= &info
->var
;
884 if (var
->pixclock
!= 0) {
885 DRM_ERROR("PIXEL CLOCK SET\n");
889 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper
);
891 if (fb_helper
->delayed_hotplug
) {
892 fb_helper
->delayed_hotplug
= false;
893 drm_fb_helper_hotplug_event(fb_helper
);
897 EXPORT_SYMBOL(drm_fb_helper_set_par
);
900 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
901 * @var: updated screen information
902 * @info: fbdev registered by the helper
904 int drm_fb_helper_pan_display(struct fb_var_screeninfo
*var
,
905 struct fb_info
*info
)
907 struct drm_fb_helper
*fb_helper
= info
->par
;
908 struct drm_device
*dev
= fb_helper
->dev
;
909 struct drm_mode_set
*modeset
;
913 drm_modeset_lock_all(dev
);
914 if (!drm_fb_helper_is_bound(fb_helper
)) {
915 drm_modeset_unlock_all(dev
);
919 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
920 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
922 modeset
->x
= var
->xoffset
;
923 modeset
->y
= var
->yoffset
;
925 if (modeset
->num_connectors
) {
926 ret
= drm_mode_set_config_internal(modeset
);
928 info
->var
.xoffset
= var
->xoffset
;
929 info
->var
.yoffset
= var
->yoffset
;
933 drm_modeset_unlock_all(dev
);
936 EXPORT_SYMBOL(drm_fb_helper_pan_display
);
939 * Allocates the backing storage and sets up the fbdev info structure through
940 * the ->fb_probe callback and then registers the fbdev and sets up the panic
943 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper
*fb_helper
,
949 struct fb_info
*info
;
950 struct drm_fb_helper_surface_size sizes
;
953 memset(&sizes
, 0, sizeof(struct drm_fb_helper_surface_size
));
954 sizes
.surface_depth
= 24;
955 sizes
.surface_bpp
= 32;
956 sizes
.fb_width
= (unsigned)-1;
957 sizes
.fb_height
= (unsigned)-1;
959 /* if driver picks 8 or 16 by default use that
960 for both depth/bpp */
961 if (preferred_bpp
!= sizes
.surface_bpp
)
962 sizes
.surface_depth
= sizes
.surface_bpp
= preferred_bpp
;
964 /* first up get a count of crtcs now in use and new min/maxes width/heights */
965 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
966 struct drm_fb_helper_connector
*fb_helper_conn
= fb_helper
->connector_info
[i
];
967 struct drm_cmdline_mode
*cmdline_mode
;
969 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
971 if (cmdline_mode
->bpp_specified
) {
972 switch (cmdline_mode
->bpp
) {
974 sizes
.surface_depth
= sizes
.surface_bpp
= 8;
977 sizes
.surface_depth
= 15;
978 sizes
.surface_bpp
= 16;
981 sizes
.surface_depth
= sizes
.surface_bpp
= 16;
984 sizes
.surface_depth
= sizes
.surface_bpp
= 24;
987 sizes
.surface_depth
= 24;
988 sizes
.surface_bpp
= 32;
996 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
997 struct drm_display_mode
*desired_mode
;
998 desired_mode
= fb_helper
->crtc_info
[i
].desired_mode
;
1001 if (gamma_size
== 0)
1002 gamma_size
= fb_helper
->crtc_info
[i
].mode_set
.crtc
->gamma_size
;
1003 if (desired_mode
->hdisplay
< sizes
.fb_width
)
1004 sizes
.fb_width
= desired_mode
->hdisplay
;
1005 if (desired_mode
->vdisplay
< sizes
.fb_height
)
1006 sizes
.fb_height
= desired_mode
->vdisplay
;
1007 if (desired_mode
->hdisplay
> sizes
.surface_width
)
1008 sizes
.surface_width
= desired_mode
->hdisplay
;
1009 if (desired_mode
->vdisplay
> sizes
.surface_height
)
1010 sizes
.surface_height
= desired_mode
->vdisplay
;
1015 if (crtc_count
== 0 || sizes
.fb_width
== -1 || sizes
.fb_height
== -1) {
1016 /* hmm everyone went away - assume VGA cable just fell out
1017 and will come back later. */
1018 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1019 sizes
.fb_width
= sizes
.surface_width
= 1024;
1020 sizes
.fb_height
= sizes
.surface_height
= 768;
1023 /* push down into drivers */
1024 ret
= (*fb_helper
->funcs
->fb_probe
)(fb_helper
, &sizes
);
1028 info
= fb_helper
->fbdev
;
1031 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1032 * events, but at init time drm_setup_crtcs needs to be called before
1033 * the fb is allocated (since we need to figure out the desired size of
1034 * the fb before we can allocate it ...). Hence we need to fix things up
1037 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
1038 if (fb_helper
->crtc_info
[i
].mode_set
.num_connectors
)
1039 fb_helper
->crtc_info
[i
].mode_set
.fb
= fb_helper
->fb
;
1042 info
->var
.pixclock
= 0;
1043 if (register_framebuffer(info
) < 0)
1046 dev_info(fb_helper
->dev
->dev
, "fb%d: %s frame buffer device\n",
1047 info
->node
, info
->fix
.id
);
1049 /* Switch back to kernel console on panic */
1050 /* multi card linked list maybe */
1051 if (list_empty(&kernel_fb_helper_list
)) {
1052 dev_info(fb_helper
->dev
->dev
, "registered panic notifier\n");
1053 atomic_notifier_chain_register(&panic_notifier_list
,
1055 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op
);
1058 list_add(&fb_helper
->kernel_fb_list
, &kernel_fb_helper_list
);
1064 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1065 * @info: fbdev registered by the helper
1066 * @pitch: desired pitch
1067 * @depth: desired depth
1069 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1070 * fbdev emulations. Drivers which support acceleration methods which impose
1071 * additional constraints need to set up their own limits.
1073 * Drivers should call this (or their equivalent setup code) from their
1074 * ->fb_probe callback.
1076 void drm_fb_helper_fill_fix(struct fb_info
*info
, uint32_t pitch
,
1079 info
->fix
.type
= FB_TYPE_PACKED_PIXELS
;
1080 info
->fix
.visual
= depth
== 8 ? FB_VISUAL_PSEUDOCOLOR
:
1081 FB_VISUAL_TRUECOLOR
;
1082 info
->fix
.mmio_start
= 0;
1083 info
->fix
.mmio_len
= 0;
1084 info
->fix
.type_aux
= 0;
1085 info
->fix
.xpanstep
= 1; /* doing it in hw */
1086 info
->fix
.ypanstep
= 1; /* doing it in hw */
1087 info
->fix
.ywrapstep
= 0;
1088 info
->fix
.accel
= FB_ACCEL_NONE
;
1090 info
->fix
.line_length
= pitch
;
1093 EXPORT_SYMBOL(drm_fb_helper_fill_fix
);
1096 * drm_fb_helper_fill_var - initalizes variable fbdev information
1097 * @info: fbdev instance to set up
1098 * @fb_helper: fb helper instance to use as template
1099 * @fb_width: desired fb width
1100 * @fb_height: desired fb height
1102 * Sets up the variable fbdev metainformation from the given fb helper instance
1103 * and the drm framebuffer allocated in fb_helper->fb.
1105 * Drivers should call this (or their equivalent setup code) from their
1106 * ->fb_probe callback after having allocated the fbdev backing
1107 * storage framebuffer.
1109 void drm_fb_helper_fill_var(struct fb_info
*info
, struct drm_fb_helper
*fb_helper
,
1110 uint32_t fb_width
, uint32_t fb_height
)
1112 struct drm_framebuffer
*fb
= fb_helper
->fb
;
1113 info
->pseudo_palette
= fb_helper
->pseudo_palette
;
1114 info
->var
.xres_virtual
= fb
->width
;
1115 info
->var
.yres_virtual
= fb
->height
;
1116 info
->var
.bits_per_pixel
= fb
->bits_per_pixel
;
1117 info
->var
.accel_flags
= FB_ACCELF_TEXT
;
1118 info
->var
.xoffset
= 0;
1119 info
->var
.yoffset
= 0;
1120 info
->var
.activate
= FB_ACTIVATE_NOW
;
1121 info
->var
.height
= -1;
1122 info
->var
.width
= -1;
1124 switch (fb
->depth
) {
1126 info
->var
.red
.offset
= 0;
1127 info
->var
.green
.offset
= 0;
1128 info
->var
.blue
.offset
= 0;
1129 info
->var
.red
.length
= 8; /* 8bit DAC */
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
= 10;
1137 info
->var
.green
.offset
= 5;
1138 info
->var
.blue
.offset
= 0;
1139 info
->var
.red
.length
= 5;
1140 info
->var
.green
.length
= 5;
1141 info
->var
.blue
.length
= 5;
1142 info
->var
.transp
.offset
= 15;
1143 info
->var
.transp
.length
= 1;
1146 info
->var
.red
.offset
= 11;
1147 info
->var
.green
.offset
= 5;
1148 info
->var
.blue
.offset
= 0;
1149 info
->var
.red
.length
= 5;
1150 info
->var
.green
.length
= 6;
1151 info
->var
.blue
.length
= 5;
1152 info
->var
.transp
.offset
= 0;
1155 info
->var
.red
.offset
= 16;
1156 info
->var
.green
.offset
= 8;
1157 info
->var
.blue
.offset
= 0;
1158 info
->var
.red
.length
= 8;
1159 info
->var
.green
.length
= 8;
1160 info
->var
.blue
.length
= 8;
1161 info
->var
.transp
.offset
= 0;
1162 info
->var
.transp
.length
= 0;
1165 info
->var
.red
.offset
= 16;
1166 info
->var
.green
.offset
= 8;
1167 info
->var
.blue
.offset
= 0;
1168 info
->var
.red
.length
= 8;
1169 info
->var
.green
.length
= 8;
1170 info
->var
.blue
.length
= 8;
1171 info
->var
.transp
.offset
= 24;
1172 info
->var
.transp
.length
= 8;
1178 info
->var
.xres
= fb_width
;
1179 info
->var
.yres
= fb_height
;
1181 EXPORT_SYMBOL(drm_fb_helper_fill_var
);
1183 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper
*fb_helper
,
1187 struct drm_connector
*connector
;
1191 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1192 connector
= fb_helper
->connector_info
[i
]->connector
;
1193 count
+= connector
->funcs
->fill_modes(connector
, maxX
, maxY
);
1199 struct drm_display_mode
*drm_has_preferred_mode(struct drm_fb_helper_connector
*fb_connector
, int width
, int height
)
1201 struct drm_display_mode
*mode
;
1203 list_for_each_entry(mode
, &fb_connector
->connector
->modes
, head
) {
1204 if (mode
->hdisplay
> width
||
1205 mode
->vdisplay
> height
)
1207 if (mode
->type
& DRM_MODE_TYPE_PREFERRED
)
1212 EXPORT_SYMBOL(drm_has_preferred_mode
);
1214 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector
*fb_connector
)
1216 return fb_connector
->connector
->cmdline_mode
.specified
;
1219 struct drm_display_mode
*drm_pick_cmdline_mode(struct drm_fb_helper_connector
*fb_helper_conn
,
1220 int width
, int height
)
1222 struct drm_cmdline_mode
*cmdline_mode
;
1223 struct drm_display_mode
*mode
= NULL
;
1224 bool prefer_non_interlace
;
1226 cmdline_mode
= &fb_helper_conn
->connector
->cmdline_mode
;
1227 if (cmdline_mode
->specified
== false)
1230 /* attempt to find a matching mode in the list of modes
1231 * we have gotten so far, if not add a CVT mode that conforms
1233 if (cmdline_mode
->rb
|| cmdline_mode
->margins
)
1236 prefer_non_interlace
= !cmdline_mode
->interlace
;
1238 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1239 /* check width/height */
1240 if (mode
->hdisplay
!= cmdline_mode
->xres
||
1241 mode
->vdisplay
!= cmdline_mode
->yres
)
1244 if (cmdline_mode
->refresh_specified
) {
1245 if (mode
->vrefresh
!= cmdline_mode
->refresh
)
1249 if (cmdline_mode
->interlace
) {
1250 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
1252 } else if (prefer_non_interlace
) {
1253 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
1259 if (prefer_non_interlace
) {
1260 prefer_non_interlace
= false;
1265 mode
= drm_mode_create_from_cmdline_mode(fb_helper_conn
->connector
->dev
,
1267 list_add(&mode
->head
, &fb_helper_conn
->connector
->modes
);
1270 EXPORT_SYMBOL(drm_pick_cmdline_mode
);
1272 static bool drm_connector_enabled(struct drm_connector
*connector
, bool strict
)
1277 enable
= connector
->status
== connector_status_connected
;
1279 enable
= connector
->status
!= connector_status_disconnected
;
1284 static void drm_enable_connectors(struct drm_fb_helper
*fb_helper
,
1287 bool any_enabled
= false;
1288 struct drm_connector
*connector
;
1291 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1292 connector
= fb_helper
->connector_info
[i
]->connector
;
1293 enabled
[i
] = drm_connector_enabled(connector
, true);
1294 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector
->base
.id
,
1295 enabled
[i
] ? "yes" : "no");
1296 any_enabled
|= enabled
[i
];
1302 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1303 connector
= fb_helper
->connector_info
[i
]->connector
;
1304 enabled
[i
] = drm_connector_enabled(connector
, false);
1308 static bool drm_target_cloned(struct drm_fb_helper
*fb_helper
,
1309 struct drm_display_mode
**modes
,
1310 bool *enabled
, int width
, int height
)
1313 bool can_clone
= false;
1314 struct drm_fb_helper_connector
*fb_helper_conn
;
1315 struct drm_display_mode
*dmt_mode
, *mode
;
1317 /* only contemplate cloning in the single crtc case */
1318 if (fb_helper
->crtc_count
> 1)
1322 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1327 /* only contemplate cloning if more than one connector is enabled */
1331 /* check the command line or if nothing common pick 1024x768 */
1333 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1336 fb_helper_conn
= fb_helper
->connector_info
[i
];
1337 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1342 for (j
= 0; j
< i
; j
++) {
1345 if (!drm_mode_equal(modes
[j
], modes
[i
]))
1351 DRM_DEBUG_KMS("can clone using command line\n");
1355 /* try and find a 1024x768 mode on each connector */
1357 dmt_mode
= drm_mode_find_dmt(fb_helper
->dev
, 1024, 768, 60, false);
1359 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1364 fb_helper_conn
= fb_helper
->connector_info
[i
];
1365 list_for_each_entry(mode
, &fb_helper_conn
->connector
->modes
, head
) {
1366 if (drm_mode_equal(mode
, dmt_mode
))
1374 DRM_DEBUG_KMS("can clone using 1024x768\n");
1377 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1381 static bool drm_target_preferred(struct drm_fb_helper
*fb_helper
,
1382 struct drm_display_mode
**modes
,
1383 bool *enabled
, int width
, int height
)
1385 struct drm_fb_helper_connector
*fb_helper_conn
;
1388 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1389 fb_helper_conn
= fb_helper
->connector_info
[i
];
1391 if (enabled
[i
] == false)
1394 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1395 fb_helper_conn
->connector
->base
.id
);
1397 /* got for command line mode first */
1398 modes
[i
] = drm_pick_cmdline_mode(fb_helper_conn
, width
, height
);
1400 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1401 fb_helper_conn
->connector
->base
.id
);
1402 modes
[i
] = drm_has_preferred_mode(fb_helper_conn
, width
, height
);
1404 /* No preferred modes, pick one off the list */
1405 if (!modes
[i
] && !list_empty(&fb_helper_conn
->connector
->modes
)) {
1406 list_for_each_entry(modes
[i
], &fb_helper_conn
->connector
->modes
, head
)
1409 DRM_DEBUG_KMS("found mode %s\n", modes
[i
] ? modes
[i
]->name
:
1415 static int drm_pick_crtcs(struct drm_fb_helper
*fb_helper
,
1416 struct drm_fb_helper_crtc
**best_crtcs
,
1417 struct drm_display_mode
**modes
,
1418 int n
, int width
, int height
)
1421 struct drm_device
*dev
= fb_helper
->dev
;
1422 struct drm_connector
*connector
;
1423 struct drm_connector_helper_funcs
*connector_funcs
;
1424 struct drm_encoder
*encoder
;
1425 int my_score
, best_score
, score
;
1426 struct drm_fb_helper_crtc
**crtcs
, *crtc
;
1427 struct drm_fb_helper_connector
*fb_helper_conn
;
1429 if (n
== fb_helper
->connector_count
)
1432 fb_helper_conn
= fb_helper
->connector_info
[n
];
1433 connector
= fb_helper_conn
->connector
;
1435 best_crtcs
[n
] = NULL
;
1436 best_score
= drm_pick_crtcs(fb_helper
, best_crtcs
, modes
, n
+1, width
, height
);
1437 if (modes
[n
] == NULL
)
1440 crtcs
= kzalloc(dev
->mode_config
.num_connector
*
1441 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1446 if (connector
->status
== connector_status_connected
)
1448 if (drm_has_cmdline_mode(fb_helper_conn
))
1450 if (drm_has_preferred_mode(fb_helper_conn
, width
, height
))
1453 connector_funcs
= connector
->helper_private
;
1454 encoder
= connector_funcs
->best_encoder(connector
);
1458 /* select a crtc for this connector and then attempt to configure
1459 remaining connectors */
1460 for (c
= 0; c
< fb_helper
->crtc_count
; c
++) {
1461 crtc
= &fb_helper
->crtc_info
[c
];
1463 if ((encoder
->possible_crtcs
& (1 << c
)) == 0)
1466 for (o
= 0; o
< n
; o
++)
1467 if (best_crtcs
[o
] == crtc
)
1471 /* ignore cloning unless only a single crtc */
1472 if (fb_helper
->crtc_count
> 1)
1475 if (!drm_mode_equal(modes
[o
], modes
[n
]))
1480 memcpy(crtcs
, best_crtcs
, n
* sizeof(struct drm_fb_helper_crtc
*));
1481 score
= my_score
+ drm_pick_crtcs(fb_helper
, crtcs
, modes
, n
+ 1,
1483 if (score
> best_score
) {
1485 memcpy(best_crtcs
, crtcs
,
1486 dev
->mode_config
.num_connector
*
1487 sizeof(struct drm_fb_helper_crtc
*));
1495 static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper
)
1497 struct drm_device
*dev
= fb_helper
->dev
;
1498 struct drm_fb_helper_crtc
**crtcs
;
1499 struct drm_display_mode
**modes
;
1500 struct drm_mode_set
*modeset
;
1505 DRM_DEBUG_KMS("\n");
1507 width
= dev
->mode_config
.max_width
;
1508 height
= dev
->mode_config
.max_height
;
1510 crtcs
= kcalloc(dev
->mode_config
.num_connector
,
1511 sizeof(struct drm_fb_helper_crtc
*), GFP_KERNEL
);
1512 modes
= kcalloc(dev
->mode_config
.num_connector
,
1513 sizeof(struct drm_display_mode
*), GFP_KERNEL
);
1514 enabled
= kcalloc(dev
->mode_config
.num_connector
,
1515 sizeof(bool), GFP_KERNEL
);
1516 if (!crtcs
|| !modes
|| !enabled
) {
1517 DRM_ERROR("Memory allocation failed\n");
1522 drm_enable_connectors(fb_helper
, enabled
);
1524 if (!(fb_helper
->funcs
->initial_config
&&
1525 fb_helper
->funcs
->initial_config(fb_helper
, crtcs
, modes
,
1526 enabled
, width
, height
))) {
1527 memset(modes
, 0, dev
->mode_config
.num_connector
*sizeof(modes
[0]));
1528 memset(crtcs
, 0, dev
->mode_config
.num_connector
*sizeof(crtcs
[0]));
1530 if (!drm_target_cloned(fb_helper
,
1531 modes
, enabled
, width
, height
) &&
1532 !drm_target_preferred(fb_helper
,
1533 modes
, enabled
, width
, height
))
1534 DRM_ERROR("Unable to find initial modes\n");
1536 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1539 drm_pick_crtcs(fb_helper
, crtcs
, modes
, 0, width
, height
);
1542 /* need to set the modesets up here for use later */
1543 /* fill out the connector<->crtc mappings into the modesets */
1544 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1545 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1546 modeset
->num_connectors
= 0;
1550 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
1551 struct drm_display_mode
*mode
= modes
[i
];
1552 struct drm_fb_helper_crtc
*fb_crtc
= crtcs
[i
];
1553 modeset
= &fb_crtc
->mode_set
;
1555 if (mode
&& fb_crtc
) {
1556 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1557 mode
->name
, fb_crtc
->mode_set
.crtc
->base
.id
);
1558 fb_crtc
->desired_mode
= mode
;
1560 drm_mode_destroy(dev
, modeset
->mode
);
1561 modeset
->mode
= drm_mode_duplicate(dev
,
1562 fb_crtc
->desired_mode
);
1563 modeset
->connectors
[modeset
->num_connectors
++] = fb_helper
->connector_info
[i
]->connector
;
1564 modeset
->fb
= fb_helper
->fb
;
1568 /* Clear out any old modes if there are no more connected outputs. */
1569 for (i
= 0; i
< fb_helper
->crtc_count
; i
++) {
1570 modeset
= &fb_helper
->crtc_info
[i
].mode_set
;
1571 if (modeset
->num_connectors
== 0) {
1572 BUG_ON(modeset
->fb
);
1573 BUG_ON(modeset
->num_connectors
);
1575 drm_mode_destroy(dev
, modeset
->mode
);
1576 modeset
->mode
= NULL
;
1586 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1587 * @fb_helper: fb_helper device struct
1588 * @bpp_sel: bpp value to use for the framebuffer configuration
1590 * Scans the CRTCs and connectors and tries to put together an initial setup.
1591 * At the moment, this is a cloned configuration across all heads with
1592 * a new framebuffer object as the backing store.
1594 * Note that this also registers the fbdev and so allows userspace to call into
1595 * the driver through the fbdev interfaces.
1597 * This function will call down into the ->fb_probe callback to let
1598 * the driver allocate and initialize the fbdev info structure and the drm
1599 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1600 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1601 * values for the fbdev info structure.
1604 * Zero if everything went ok, nonzero otherwise.
1606 bool drm_fb_helper_initial_config(struct drm_fb_helper
*fb_helper
, int bpp_sel
)
1608 struct drm_device
*dev
= fb_helper
->dev
;
1611 mutex_lock(&dev
->mode_config
.mutex
);
1612 count
= drm_fb_helper_probe_connector_modes(fb_helper
,
1613 dev
->mode_config
.max_width
,
1614 dev
->mode_config
.max_height
);
1615 mutex_unlock(&dev
->mode_config
.mutex
);
1617 * we shouldn't end up with no modes here.
1620 dev_info(fb_helper
->dev
->dev
, "No connectors reported connected with modes\n");
1622 drm_setup_crtcs(fb_helper
);
1624 return drm_fb_helper_single_fb_probe(fb_helper
, bpp_sel
);
1626 EXPORT_SYMBOL(drm_fb_helper_initial_config
);
1629 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1630 * probing all the outputs attached to the fb
1631 * @fb_helper: the drm_fb_helper
1633 * Scan the connectors attached to the fb_helper and try to put together a
1634 * setup after *notification of a change in output configuration.
1636 * Called at runtime, takes the mode config locks to be able to check/change the
1637 * modeset configuration. Must be run from process context (which usually means
1638 * either the output polling work or a work item launched from the driver's
1639 * hotplug interrupt).
1641 * Note that drivers may call this even before calling
1642 * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1643 * for a race-free fbcon setup and will make sure that the fbdev emulation will
1644 * not miss any hotplug events.
1647 * 0 on success and a non-zero error code otherwise.
1649 int drm_fb_helper_hotplug_event(struct drm_fb_helper
*fb_helper
)
1651 struct drm_device
*dev
= fb_helper
->dev
;
1652 u32 max_width
, max_height
;
1654 mutex_lock(&fb_helper
->dev
->mode_config
.mutex
);
1655 if (!fb_helper
->fb
|| !drm_fb_helper_is_bound(fb_helper
)) {
1656 fb_helper
->delayed_hotplug
= true;
1657 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1660 DRM_DEBUG_KMS("\n");
1662 max_width
= fb_helper
->fb
->width
;
1663 max_height
= fb_helper
->fb
->height
;
1665 drm_fb_helper_probe_connector_modes(fb_helper
, max_width
, max_height
);
1666 mutex_unlock(&fb_helper
->dev
->mode_config
.mutex
);
1668 drm_modeset_lock_all(dev
);
1669 drm_setup_crtcs(fb_helper
);
1670 drm_modeset_unlock_all(dev
);
1671 drm_fb_helper_set_par(fb_helper
->fbdev
);
1675 EXPORT_SYMBOL(drm_fb_helper_hotplug_event
);
1677 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1678 * but the module doesn't depend on any fb console symbols. At least
1679 * attempt to load fbcon to avoid leaving the system without a usable console.
1681 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1682 static int __init
drm_fb_helper_modinit(void)
1684 const char *name
= "fbcon";
1685 struct module
*fbcon
;
1687 mutex_lock(&module_mutex
);
1688 fbcon
= find_module(name
);
1689 mutex_unlock(&module_mutex
);
1692 request_module_nowait(name
);
1696 module_init(drm_fb_helper_modinit
);