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 #include <linux/kernel.h>
31 #include <linux/sysrq.h>
32 #include <linux/slab.h>
36 #include "drm_fb_helper.h"
37 #include "drm_crtc_helper.h"
39 MODULE_AUTHOR("David Airlie, Jesse Barnes");
40 MODULE_DESCRIPTION("DRM KMS helper");
41 MODULE_LICENSE("GPL and additional rights");
43 static LIST_HEAD(kernel_fb_helper_list);
45 /* simple single crtc case helper function */
46 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
48 struct drm_device *dev = fb_helper->dev;
49 struct drm_connector *connector;
52 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
53 struct drm_fb_helper_connector *fb_helper_connector;
55 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
56 if (!fb_helper_connector)
59 fb_helper_connector->connector = connector;
60 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
64 for (i = 0; i < fb_helper->connector_count; i++) {
65 kfree(fb_helper->connector_info[i]);
66 fb_helper->connector_info[i] = NULL;
68 fb_helper->connector_count = 0;
71 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
73 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
75 struct drm_fb_helper_connector *fb_helper_conn;
78 for (i = 0; i < fb_helper->connector_count; i++) {
79 struct drm_cmdline_mode *mode;
80 struct drm_connector *connector;
83 fb_helper_conn = fb_helper->connector_info[i];
84 connector = fb_helper_conn->connector;
85 mode = &fb_helper_conn->cmdline_mode;
87 /* do something on return - turn off connector maybe */
88 if (fb_get_options(drm_get_connector_name(connector), &option))
91 if (drm_mode_parse_command_line_for_connector(option,
96 switch (mode->force) {
97 case DRM_FORCE_OFF: s = "OFF"; break;
98 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
100 case DRM_FORCE_ON: s = "ON"; break;
103 DRM_INFO("forcing %s connector %s\n",
104 drm_get_connector_name(connector), s);
105 connector->force = mode->force;
108 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
109 drm_get_connector_name(connector),
110 mode->xres, mode->yres,
111 mode->refresh_specified ? mode->refresh : 60,
112 mode->rb ? " reduced blanking" : "",
113 mode->margins ? " with margins" : "",
114 mode->interlace ? " interlaced" : "");
121 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
123 uint16_t *r_base, *g_base, *b_base;
126 r_base = crtc->gamma_store;
127 g_base = r_base + crtc->gamma_size;
128 b_base = g_base + crtc->gamma_size;
130 for (i = 0; i < crtc->gamma_size; i++)
131 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
134 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
136 uint16_t *r_base, *g_base, *b_base;
138 r_base = crtc->gamma_store;
139 g_base = r_base + crtc->gamma_size;
140 b_base = g_base + crtc->gamma_size;
142 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
145 int drm_fb_helper_debug_enter(struct fb_info *info)
147 struct drm_fb_helper *helper = info->par;
148 struct drm_crtc_helper_funcs *funcs;
151 if (list_empty(&kernel_fb_helper_list))
154 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
155 for (i = 0; i < helper->crtc_count; i++) {
156 struct drm_mode_set *mode_set =
157 &helper->crtc_info[i].mode_set;
159 if (!mode_set->crtc->enabled)
162 funcs = mode_set->crtc->helper_private;
163 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
164 funcs->mode_set_base_atomic(mode_set->crtc,
168 ENTER_ATOMIC_MODE_SET);
174 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
176 /* Find the real fb for a given fb helper CRTC */
177 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
179 struct drm_device *dev = crtc->dev;
182 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
183 if (crtc->base.id == c->base.id)
190 int drm_fb_helper_debug_leave(struct fb_info *info)
192 struct drm_fb_helper *helper = info->par;
193 struct drm_crtc *crtc;
194 struct drm_crtc_helper_funcs *funcs;
195 struct drm_framebuffer *fb;
198 for (i = 0; i < helper->crtc_count; i++) {
199 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
200 crtc = mode_set->crtc;
201 funcs = crtc->helper_private;
202 fb = drm_mode_config_fb(crtc);
208 DRM_ERROR("no fb to restore??\n");
212 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
213 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
214 crtc->y, LEAVE_ATOMIC_MODE_SET);
219 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
221 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
225 for (i = 0; i < fb_helper->crtc_count; i++) {
226 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
227 ret = drm_crtc_helper_set_config(mode_set);
233 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
235 bool drm_fb_helper_force_kernel_mode(void)
237 bool ret, error = false;
238 struct drm_fb_helper *helper;
240 if (list_empty(&kernel_fb_helper_list))
243 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
244 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
247 ret = drm_fb_helper_restore_fbdev_mode(helper);
254 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
257 printk(KERN_ERR "panic occurred, switching back to text console\n");
258 return drm_fb_helper_force_kernel_mode();
260 EXPORT_SYMBOL(drm_fb_helper_panic);
262 static struct notifier_block paniced = {
263 .notifier_call = drm_fb_helper_panic,
267 * drm_fb_helper_restore - restore the framebuffer console (kernel) config
269 * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
271 void drm_fb_helper_restore(void)
274 ret = drm_fb_helper_force_kernel_mode();
276 DRM_ERROR("Failed to restore crtc configuration\n");
278 EXPORT_SYMBOL(drm_fb_helper_restore);
280 #ifdef CONFIG_MAGIC_SYSRQ
281 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
283 drm_fb_helper_restore();
285 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
287 static void drm_fb_helper_sysrq(int dummy1)
289 schedule_work(&drm_fb_helper_restore_work);
292 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
293 .handler = drm_fb_helper_sysrq,
294 .help_msg = "force-fb(V)",
295 .action_msg = "Restore framebuffer console",
298 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
301 static void drm_fb_helper_on(struct fb_info *info)
303 struct drm_fb_helper *fb_helper = info->par;
304 struct drm_device *dev = fb_helper->dev;
305 struct drm_crtc *crtc;
306 struct drm_crtc_helper_funcs *crtc_funcs;
307 struct drm_connector *connector;
308 struct drm_encoder *encoder;
312 * For each CRTC in this fb, turn the crtc on then,
313 * find all associated encoders and turn them on.
315 mutex_lock(&dev->mode_config.mutex);
316 for (i = 0; i < fb_helper->crtc_count; i++) {
317 crtc = fb_helper->crtc_info[i].mode_set.crtc;
318 crtc_funcs = crtc->helper_private;
323 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
325 /* Walk the connectors & encoders on this fb turning them on */
326 for (j = 0; j < fb_helper->connector_count; j++) {
327 connector = fb_helper->connector_info[j]->connector;
328 connector->dpms = DRM_MODE_DPMS_ON;
329 drm_connector_property_set_value(connector,
330 dev->mode_config.dpms_property,
333 /* Found a CRTC on this fb, now find encoders */
334 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
335 if (encoder->crtc == crtc) {
336 struct drm_encoder_helper_funcs *encoder_funcs;
338 encoder_funcs = encoder->helper_private;
339 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
343 mutex_unlock(&dev->mode_config.mutex);
346 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
348 struct drm_fb_helper *fb_helper = info->par;
349 struct drm_device *dev = fb_helper->dev;
350 struct drm_crtc *crtc;
351 struct drm_crtc_helper_funcs *crtc_funcs;
352 struct drm_connector *connector;
353 struct drm_encoder *encoder;
357 * For each CRTC in this fb, find all associated encoders
358 * and turn them off, then turn off the CRTC.
360 mutex_lock(&dev->mode_config.mutex);
361 for (i = 0; i < fb_helper->crtc_count; i++) {
362 crtc = fb_helper->crtc_info[i].mode_set.crtc;
363 crtc_funcs = crtc->helper_private;
368 /* Walk the connectors on this fb and mark them off */
369 for (j = 0; j < fb_helper->connector_count; j++) {
370 connector = fb_helper->connector_info[j]->connector;
371 connector->dpms = dpms_mode;
372 drm_connector_property_set_value(connector,
373 dev->mode_config.dpms_property,
376 /* Found a CRTC on this fb, now find encoders */
377 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
378 if (encoder->crtc == crtc) {
379 struct drm_encoder_helper_funcs *encoder_funcs;
381 encoder_funcs = encoder->helper_private;
382 encoder_funcs->dpms(encoder, dpms_mode);
385 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
387 mutex_unlock(&dev->mode_config.mutex);
390 int drm_fb_helper_blank(int blank, struct fb_info *info)
393 /* Display: On; HSync: On, VSync: On */
394 case FB_BLANK_UNBLANK:
395 drm_fb_helper_on(info);
397 /* Display: Off; HSync: On, VSync: On */
398 case FB_BLANK_NORMAL:
399 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
401 /* Display: Off; HSync: Off, VSync: On */
402 case FB_BLANK_HSYNC_SUSPEND:
403 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
405 /* Display: Off; HSync: On, VSync: Off */
406 case FB_BLANK_VSYNC_SUSPEND:
407 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
409 /* Display: Off; HSync: Off, VSync: Off */
410 case FB_BLANK_POWERDOWN:
411 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
416 EXPORT_SYMBOL(drm_fb_helper_blank);
418 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
422 for (i = 0; i < helper->connector_count; i++)
423 kfree(helper->connector_info[i]);
424 kfree(helper->connector_info);
425 for (i = 0; i < helper->crtc_count; i++)
426 kfree(helper->crtc_info[i].mode_set.connectors);
427 kfree(helper->crtc_info);
430 int drm_fb_helper_init(struct drm_device *dev,
431 struct drm_fb_helper *fb_helper,
432 int crtc_count, int max_conn_count)
434 struct drm_crtc *crtc;
438 fb_helper->dev = dev;
440 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
442 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
443 if (!fb_helper->crtc_info)
446 fb_helper->crtc_count = crtc_count;
447 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
448 if (!fb_helper->connector_info) {
449 kfree(fb_helper->crtc_info);
452 fb_helper->connector_count = 0;
454 for (i = 0; i < crtc_count; i++) {
455 fb_helper->crtc_info[i].mode_set.connectors =
456 kcalloc(max_conn_count,
457 sizeof(struct drm_connector *),
460 if (!fb_helper->crtc_info[i].mode_set.connectors) {
464 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
468 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
469 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
470 fb_helper->crtc_info[i].mode_set.crtc = crtc;
473 fb_helper->conn_limit = max_conn_count;
476 drm_fb_helper_crtc_free(fb_helper);
479 EXPORT_SYMBOL(drm_fb_helper_init);
481 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
483 if (!list_empty(&fb_helper->kernel_fb_list)) {
484 list_del(&fb_helper->kernel_fb_list);
485 if (list_empty(&kernel_fb_helper_list)) {
486 printk(KERN_INFO "drm: unregistered panic notifier\n");
487 atomic_notifier_chain_unregister(&panic_notifier_list,
489 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
493 drm_fb_helper_crtc_free(fb_helper);
496 EXPORT_SYMBOL(drm_fb_helper_fini);
498 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
499 u16 blue, u16 regno, struct fb_info *info)
501 struct drm_fb_helper *fb_helper = info->par;
502 struct drm_framebuffer *fb = fb_helper->fb;
505 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
508 /* place color in psuedopalette */
511 palette = (u32 *)info->pseudo_palette;
512 red >>= (16 - info->var.red.length);
513 green >>= (16 - info->var.green.length);
514 blue >>= (16 - info->var.blue.length);
515 value = (red << info->var.red.offset) |
516 (green << info->var.green.offset) |
517 (blue << info->var.blue.offset);
518 if (info->var.transp.length > 0) {
519 u32 mask = (1 << info->var.transp.length) - 1;
520 mask <<= info->var.transp.offset;
523 palette[regno] = value;
529 if (fb->bits_per_pixel == 16) {
532 if (fb->depth == 16 && regno > 63)
534 if (fb->depth == 15 && regno > 31)
537 if (fb->depth == 16) {
541 for (i = 0; i < 8; i++)
542 fb_helper->funcs->gamma_set(crtc, red,
543 green, blue, pindex + i);
546 fb_helper->funcs->gamma_get(crtc, &r,
550 for (i = 0; i < 4; i++)
551 fb_helper->funcs->gamma_set(crtc, r,
558 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
562 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
564 struct drm_fb_helper *fb_helper = info->par;
565 struct drm_crtc_helper_funcs *crtc_funcs;
566 u16 *red, *green, *blue, *transp;
567 struct drm_crtc *crtc;
571 for (i = 0; i < fb_helper->crtc_count; i++) {
572 crtc = fb_helper->crtc_info[i].mode_set.crtc;
573 crtc_funcs = crtc->helper_private;
578 transp = cmap->transp;
581 for (j = 0; j < cmap->len; j++) {
582 u16 hred, hgreen, hblue, htransp = 0xffff;
591 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
595 crtc_funcs->load_lut(crtc);
599 EXPORT_SYMBOL(drm_fb_helper_setcmap);
601 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
602 struct fb_info *info)
604 struct drm_fb_helper *fb_helper = info->par;
605 struct drm_framebuffer *fb = fb_helper->fb;
608 if (var->pixclock != 0 || in_dbg_master())
611 /* Need to resize the fb object !!! */
612 if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
613 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
614 "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
615 fb->width, fb->height, fb->bits_per_pixel);
619 switch (var->bits_per_pixel) {
621 depth = (var->green.length == 6) ? 16 : 15;
624 depth = (var->transp.length > 0) ? 32 : 24;
627 depth = var->bits_per_pixel;
634 var->green.offset = 0;
635 var->blue.offset = 0;
637 var->green.length = 8;
638 var->blue.length = 8;
639 var->transp.length = 0;
640 var->transp.offset = 0;
643 var->red.offset = 10;
644 var->green.offset = 5;
645 var->blue.offset = 0;
647 var->green.length = 5;
648 var->blue.length = 5;
649 var->transp.length = 1;
650 var->transp.offset = 15;
653 var->red.offset = 11;
654 var->green.offset = 5;
655 var->blue.offset = 0;
657 var->green.length = 6;
658 var->blue.length = 5;
659 var->transp.length = 0;
660 var->transp.offset = 0;
663 var->red.offset = 16;
664 var->green.offset = 8;
665 var->blue.offset = 0;
667 var->green.length = 8;
668 var->blue.length = 8;
669 var->transp.length = 0;
670 var->transp.offset = 0;
673 var->red.offset = 16;
674 var->green.offset = 8;
675 var->blue.offset = 0;
677 var->green.length = 8;
678 var->blue.length = 8;
679 var->transp.length = 8;
680 var->transp.offset = 24;
687 EXPORT_SYMBOL(drm_fb_helper_check_var);
689 /* this will let fbcon do the mode init */
690 int drm_fb_helper_set_par(struct fb_info *info)
692 struct drm_fb_helper *fb_helper = info->par;
693 struct drm_device *dev = fb_helper->dev;
694 struct fb_var_screeninfo *var = &info->var;
695 struct drm_crtc *crtc;
699 if (var->pixclock != 0) {
700 DRM_ERROR("PIXEL CLOCK SET\n");
704 mutex_lock(&dev->mode_config.mutex);
705 for (i = 0; i < fb_helper->crtc_count; i++) {
706 crtc = fb_helper->crtc_info[i].mode_set.crtc;
707 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
709 mutex_unlock(&dev->mode_config.mutex);
713 mutex_unlock(&dev->mode_config.mutex);
715 if (fb_helper->delayed_hotplug) {
716 fb_helper->delayed_hotplug = false;
717 drm_fb_helper_hotplug_event(fb_helper);
721 EXPORT_SYMBOL(drm_fb_helper_set_par);
723 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
724 struct fb_info *info)
726 struct drm_fb_helper *fb_helper = info->par;
727 struct drm_device *dev = fb_helper->dev;
728 struct drm_mode_set *modeset;
729 struct drm_crtc *crtc;
733 mutex_lock(&dev->mode_config.mutex);
734 for (i = 0; i < fb_helper->crtc_count; i++) {
735 crtc = fb_helper->crtc_info[i].mode_set.crtc;
737 modeset = &fb_helper->crtc_info[i].mode_set;
739 modeset->x = var->xoffset;
740 modeset->y = var->yoffset;
742 if (modeset->num_connectors) {
743 ret = crtc->funcs->set_config(modeset);
745 info->var.xoffset = var->xoffset;
746 info->var.yoffset = var->yoffset;
750 mutex_unlock(&dev->mode_config.mutex);
753 EXPORT_SYMBOL(drm_fb_helper_pan_display);
755 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
761 struct fb_info *info;
762 struct drm_fb_helper_surface_size sizes;
765 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
766 sizes.surface_depth = 24;
767 sizes.surface_bpp = 32;
768 sizes.fb_width = (unsigned)-1;
769 sizes.fb_height = (unsigned)-1;
771 /* if driver picks 8 or 16 by default use that
772 for both depth/bpp */
773 if (preferred_bpp != sizes.surface_bpp) {
774 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
776 /* first up get a count of crtcs now in use and new min/maxes width/heights */
777 for (i = 0; i < fb_helper->connector_count; i++) {
778 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
779 struct drm_cmdline_mode *cmdline_mode;
781 cmdline_mode = &fb_helper_conn->cmdline_mode;
783 if (cmdline_mode->bpp_specified) {
784 switch (cmdline_mode->bpp) {
786 sizes.surface_depth = sizes.surface_bpp = 8;
789 sizes.surface_depth = 15;
790 sizes.surface_bpp = 16;
793 sizes.surface_depth = sizes.surface_bpp = 16;
796 sizes.surface_depth = sizes.surface_bpp = 24;
799 sizes.surface_depth = 24;
800 sizes.surface_bpp = 32;
808 for (i = 0; i < fb_helper->crtc_count; i++) {
809 struct drm_display_mode *desired_mode;
810 desired_mode = fb_helper->crtc_info[i].desired_mode;
814 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
815 if (desired_mode->hdisplay < sizes.fb_width)
816 sizes.fb_width = desired_mode->hdisplay;
817 if (desired_mode->vdisplay < sizes.fb_height)
818 sizes.fb_height = desired_mode->vdisplay;
819 if (desired_mode->hdisplay > sizes.surface_width)
820 sizes.surface_width = desired_mode->hdisplay;
821 if (desired_mode->vdisplay > sizes.surface_height)
822 sizes.surface_height = desired_mode->vdisplay;
827 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
828 /* hmm everyone went away - assume VGA cable just fell out
829 and will come back later. */
830 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
831 sizes.fb_width = sizes.surface_width = 1024;
832 sizes.fb_height = sizes.surface_height = 768;
835 /* push down into drivers */
836 new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
840 info = fb_helper->fbdev;
842 /* set the fb pointer */
843 for (i = 0; i < fb_helper->crtc_count; i++) {
844 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
848 info->var.pixclock = 0;
849 if (register_framebuffer(info) < 0) {
853 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
857 drm_fb_helper_set_par(info);
860 /* Switch back to kernel console on panic */
861 /* multi card linked list maybe */
862 if (list_empty(&kernel_fb_helper_list)) {
863 printk(KERN_INFO "drm: registered panic notifier\n");
864 atomic_notifier_chain_register(&panic_notifier_list,
866 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
869 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
873 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
875 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
878 info->fix.type = FB_TYPE_PACKED_PIXELS;
879 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
881 info->fix.mmio_start = 0;
882 info->fix.mmio_len = 0;
883 info->fix.type_aux = 0;
884 info->fix.xpanstep = 1; /* doing it in hw */
885 info->fix.ypanstep = 1; /* doing it in hw */
886 info->fix.ywrapstep = 0;
887 info->fix.accel = FB_ACCEL_NONE;
888 info->fix.type_aux = 0;
890 info->fix.line_length = pitch;
893 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
895 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
896 uint32_t fb_width, uint32_t fb_height)
898 struct drm_framebuffer *fb = fb_helper->fb;
899 info->pseudo_palette = fb_helper->pseudo_palette;
900 info->var.xres_virtual = fb->width;
901 info->var.yres_virtual = fb->height;
902 info->var.bits_per_pixel = fb->bits_per_pixel;
903 info->var.accel_flags = FB_ACCELF_TEXT;
904 info->var.xoffset = 0;
905 info->var.yoffset = 0;
906 info->var.activate = FB_ACTIVATE_NOW;
907 info->var.height = -1;
908 info->var.width = -1;
912 info->var.red.offset = 0;
913 info->var.green.offset = 0;
914 info->var.blue.offset = 0;
915 info->var.red.length = 8; /* 8bit DAC */
916 info->var.green.length = 8;
917 info->var.blue.length = 8;
918 info->var.transp.offset = 0;
919 info->var.transp.length = 0;
922 info->var.red.offset = 10;
923 info->var.green.offset = 5;
924 info->var.blue.offset = 0;
925 info->var.red.length = 5;
926 info->var.green.length = 5;
927 info->var.blue.length = 5;
928 info->var.transp.offset = 15;
929 info->var.transp.length = 1;
932 info->var.red.offset = 11;
933 info->var.green.offset = 5;
934 info->var.blue.offset = 0;
935 info->var.red.length = 5;
936 info->var.green.length = 6;
937 info->var.blue.length = 5;
938 info->var.transp.offset = 0;
941 info->var.red.offset = 16;
942 info->var.green.offset = 8;
943 info->var.blue.offset = 0;
944 info->var.red.length = 8;
945 info->var.green.length = 8;
946 info->var.blue.length = 8;
947 info->var.transp.offset = 0;
948 info->var.transp.length = 0;
951 info->var.red.offset = 16;
952 info->var.green.offset = 8;
953 info->var.blue.offset = 0;
954 info->var.red.length = 8;
955 info->var.green.length = 8;
956 info->var.blue.length = 8;
957 info->var.transp.offset = 24;
958 info->var.transp.length = 8;
964 info->var.xres = fb_width;
965 info->var.yres = fb_height;
967 EXPORT_SYMBOL(drm_fb_helper_fill_var);
969 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
973 struct drm_connector *connector;
977 for (i = 0; i < fb_helper->connector_count; i++) {
978 connector = fb_helper->connector_info[i]->connector;
979 count += connector->funcs->fill_modes(connector, maxX, maxY);
985 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
987 struct drm_display_mode *mode;
989 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
990 if (drm_mode_width(mode) > width ||
991 drm_mode_height(mode) > height)
993 if (mode->type & DRM_MODE_TYPE_PREFERRED)
999 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1001 struct drm_cmdline_mode *cmdline_mode;
1002 cmdline_mode = &fb_connector->cmdline_mode;
1003 return cmdline_mode->specified;
1006 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1007 int width, int height)
1009 struct drm_cmdline_mode *cmdline_mode;
1010 struct drm_display_mode *mode = NULL;
1012 cmdline_mode = &fb_helper_conn->cmdline_mode;
1013 if (cmdline_mode->specified == false)
1016 /* attempt to find a matching mode in the list of modes
1017 * we have gotten so far, if not add a CVT mode that conforms
1019 if (cmdline_mode->rb || cmdline_mode->margins)
1022 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1023 /* check width/height */
1024 if (mode->hdisplay != cmdline_mode->xres ||
1025 mode->vdisplay != cmdline_mode->yres)
1028 if (cmdline_mode->refresh_specified) {
1029 if (mode->vrefresh != cmdline_mode->refresh)
1033 if (cmdline_mode->interlace) {
1034 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1041 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1043 list_add(&mode->head, &fb_helper_conn->connector->modes);
1047 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1052 enable = connector->status == connector_status_connected;
1054 enable = connector->status != connector_status_disconnected;
1059 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1062 bool any_enabled = false;
1063 struct drm_connector *connector;
1066 for (i = 0; i < fb_helper->connector_count; i++) {
1067 connector = fb_helper->connector_info[i]->connector;
1068 enabled[i] = drm_connector_enabled(connector, true);
1069 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1070 enabled[i] ? "yes" : "no");
1071 any_enabled |= enabled[i];
1077 for (i = 0; i < fb_helper->connector_count; i++) {
1078 connector = fb_helper->connector_info[i]->connector;
1079 enabled[i] = drm_connector_enabled(connector, false);
1083 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1084 struct drm_display_mode **modes,
1085 bool *enabled, int width, int height)
1088 bool can_clone = false;
1089 struct drm_fb_helper_connector *fb_helper_conn;
1090 struct drm_display_mode *dmt_mode, *mode;
1092 /* only contemplate cloning in the single crtc case */
1093 if (fb_helper->crtc_count > 1)
1097 for (i = 0; i < fb_helper->connector_count; i++) {
1102 /* only contemplate cloning if more than one connector is enabled */
1106 /* check the command line or if nothing common pick 1024x768 */
1108 for (i = 0; i < fb_helper->connector_count; i++) {
1111 fb_helper_conn = fb_helper->connector_info[i];
1112 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1117 for (j = 0; j < i; j++) {
1120 if (!drm_mode_equal(modes[j], modes[i]))
1126 DRM_DEBUG_KMS("can clone using command line\n");
1130 /* try and find a 1024x768 mode on each connector */
1132 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1134 for (i = 0; i < fb_helper->connector_count; i++) {
1139 fb_helper_conn = fb_helper->connector_info[i];
1140 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1141 if (drm_mode_equal(mode, dmt_mode))
1149 DRM_DEBUG_KMS("can clone using 1024x768\n");
1152 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1156 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1157 struct drm_display_mode **modes,
1158 bool *enabled, int width, int height)
1160 struct drm_fb_helper_connector *fb_helper_conn;
1163 for (i = 0; i < fb_helper->connector_count; i++) {
1164 fb_helper_conn = fb_helper->connector_info[i];
1166 if (enabled[i] == false)
1169 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1170 fb_helper_conn->connector->base.id);
1172 /* got for command line mode first */
1173 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1175 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1176 fb_helper_conn->connector->base.id);
1177 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1179 /* No preferred modes, pick one off the list */
1180 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1181 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1184 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1190 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1191 struct drm_fb_helper_crtc **best_crtcs,
1192 struct drm_display_mode **modes,
1193 int n, int width, int height)
1196 struct drm_device *dev = fb_helper->dev;
1197 struct drm_connector *connector;
1198 struct drm_connector_helper_funcs *connector_funcs;
1199 struct drm_encoder *encoder;
1200 struct drm_fb_helper_crtc *best_crtc;
1201 int my_score, best_score, score;
1202 struct drm_fb_helper_crtc **crtcs, *crtc;
1203 struct drm_fb_helper_connector *fb_helper_conn;
1205 if (n == fb_helper->connector_count)
1208 fb_helper_conn = fb_helper->connector_info[n];
1209 connector = fb_helper_conn->connector;
1211 best_crtcs[n] = NULL;
1213 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1214 if (modes[n] == NULL)
1217 crtcs = kzalloc(dev->mode_config.num_connector *
1218 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1223 if (connector->status == connector_status_connected)
1225 if (drm_has_cmdline_mode(fb_helper_conn))
1227 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1230 connector_funcs = connector->helper_private;
1231 encoder = connector_funcs->best_encoder(connector);
1235 /* select a crtc for this connector and then attempt to configure
1236 remaining connectors */
1237 for (c = 0; c < fb_helper->crtc_count; c++) {
1238 crtc = &fb_helper->crtc_info[c];
1240 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1244 for (o = 0; o < n; o++)
1245 if (best_crtcs[o] == crtc)
1249 /* ignore cloning unless only a single crtc */
1250 if (fb_helper->crtc_count > 1)
1253 if (!drm_mode_equal(modes[o], modes[n]))
1258 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1259 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1261 if (score > best_score) {
1264 memcpy(best_crtcs, crtcs,
1265 dev->mode_config.num_connector *
1266 sizeof(struct drm_fb_helper_crtc *));
1274 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1276 struct drm_device *dev = fb_helper->dev;
1277 struct drm_fb_helper_crtc **crtcs;
1278 struct drm_display_mode **modes;
1279 struct drm_encoder *encoder;
1280 struct drm_mode_set *modeset;
1285 DRM_DEBUG_KMS("\n");
1287 width = dev->mode_config.max_width;
1288 height = dev->mode_config.max_height;
1290 /* clean out all the encoder/crtc combos */
1291 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1292 encoder->crtc = NULL;
1295 crtcs = kcalloc(dev->mode_config.num_connector,
1296 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1297 modes = kcalloc(dev->mode_config.num_connector,
1298 sizeof(struct drm_display_mode *), GFP_KERNEL);
1299 enabled = kcalloc(dev->mode_config.num_connector,
1300 sizeof(bool), GFP_KERNEL);
1302 drm_enable_connectors(fb_helper, enabled);
1304 ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1306 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1308 DRM_ERROR("Unable to find initial modes\n");
1311 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1313 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1315 /* need to set the modesets up here for use later */
1316 /* fill out the connector<->crtc mappings into the modesets */
1317 for (i = 0; i < fb_helper->crtc_count; i++) {
1318 modeset = &fb_helper->crtc_info[i].mode_set;
1319 modeset->num_connectors = 0;
1322 for (i = 0; i < fb_helper->connector_count; i++) {
1323 struct drm_display_mode *mode = modes[i];
1324 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1325 modeset = &fb_crtc->mode_set;
1327 if (mode && fb_crtc) {
1328 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1329 mode->name, fb_crtc->mode_set.crtc->base.id);
1330 fb_crtc->desired_mode = mode;
1332 drm_mode_destroy(dev, modeset->mode);
1333 modeset->mode = drm_mode_duplicate(dev,
1334 fb_crtc->desired_mode);
1335 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1345 * drm_helper_initial_config - setup a sane initial connector configuration
1349 * Called at init time, must take mode config lock.
1351 * Scan the CRTCs and connectors and try to put together an initial setup.
1352 * At the moment, this is a cloned configuration across all heads with
1353 * a new framebuffer object as the backing store.
1356 * Zero if everything went ok, nonzero otherwise.
1358 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1360 struct drm_device *dev = fb_helper->dev;
1363 /* disable all the possible outputs/crtcs before entering KMS mode */
1364 drm_helper_disable_unused_functions(fb_helper->dev);
1366 drm_fb_helper_parse_command_line(fb_helper);
1368 count = drm_fb_helper_probe_connector_modes(fb_helper,
1369 dev->mode_config.max_width,
1370 dev->mode_config.max_height);
1372 * we shouldn't end up with no modes here.
1375 printk(KERN_INFO "No connectors reported connected with modes\n");
1377 drm_setup_crtcs(fb_helper);
1379 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1381 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1384 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1385 * probing all the outputs attached to the fb.
1386 * @fb_helper: the drm_fb_helper
1389 * Called at runtime, must take mode config lock.
1391 * Scan the connectors attached to the fb_helper and try to put together a
1392 * setup after *notification of a change in output configuration.
1395 * 0 on success and a non-zero error code otherwise.
1397 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1399 struct drm_device *dev = fb_helper->dev;
1401 u32 max_width, max_height, bpp_sel;
1402 bool bound = false, crtcs_bound = false;
1403 struct drm_crtc *crtc;
1408 mutex_lock(&dev->mode_config.mutex);
1409 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1412 if (crtc->fb == fb_helper->fb)
1416 if (!bound && crtcs_bound) {
1417 fb_helper->delayed_hotplug = true;
1418 mutex_unlock(&dev->mode_config.mutex);
1421 DRM_DEBUG_KMS("\n");
1423 max_width = fb_helper->fb->width;
1424 max_height = fb_helper->fb->height;
1425 bpp_sel = fb_helper->fb->bits_per_pixel;
1427 count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1429 drm_setup_crtcs(fb_helper);
1430 mutex_unlock(&dev->mode_config.mutex);
1432 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1434 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1436 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1437 * but the module doesn't depend on any fb console symbols. At least
1438 * attempt to load fbcon to avoid leaving the system without a usable console.
1440 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1441 static int __init drm_fb_helper_modinit(void)
1443 const char *name = "fbcon";
1444 struct module *fbcon;
1446 mutex_lock(&module_mutex);
1447 fbcon = find_module(name);
1448 mutex_unlock(&module_mutex);
1451 request_module_nowait(name);
1455 module_init(drm_fb_helper_modinit);