fbdev/core/modedb.c

2  *  linux/drivers/video/modedb.c -- Standard video mode database management
34  *  Standard video mode definitions (taken from XFree86)
536  *	fb_try_mode - test a video mode
539  *	@mode: frame buffer video mode structure
542  *	Tries a video mode to test it's validity for device @info.
549 		       const struct fb_videomode *mode, unsigned int bpp)
553 	DPRINTK("Trying mode %s %dx%d-%d@%d\n",
554 		mode->name ? mode->name : "noname",
555 		mode->xres, mode->yres, bpp, mode->refresh);
556 	var->xres = mode->xres;
557 	var->yres = mode->yres;
558 	var->xres_virtual = mode->xres;
559 	var->yres_virtual = mode->yres;
564 	var->pixclock = mode->pixclock;
565 	var->left_margin = mode->left_margin;
566 	var->right_margin = mode->right_margin;
567 	var->upper_margin = mode->upper_margin;
568 	var->lower_margin = mode->lower_margin;
569 	var->hsync_len = mode->hsync_len;
570 	var->vsync_len = mode->vsync_len;
571 	var->sync = mode->sync;
572 	var->vmode = mode->vmode;
580  * fb_find_mode - finds a valid video mode
583  * @mode_option: string video mode to find
584  * @db: video mode database
586  * @default_mode: default video mode to fall back to
589  * Finds a suitable video mode, starting with the specified mode
591  * @default_mode fails, all modes in the video mode database will
594  * Valid mode specifiers for @mode_option::
609  * interlaced or progressive mode.  If 'm' is present, add margins equal
620  * 3 if default mode is used, 4 if fall back to any valid mode.
644 	/* Did the user specify a video mode? */
732 			DPRINTK("CVT mode %dx%d@%dHz%s%s%s\n", xres, yres,
751 				DPRINTK("modedb CVT: CVT mode ok\n");
755 			DPRINTK("CVT mode invalid, getting mode from database\n");
758 		DPRINTK("Trying specified video mode%s %ix%i\n",
764 			 * If the caller has provided a custom mode database and
765 			 * a valid monspecs structure, we look for the mode with
767 			 * it and try to find a mode with a refresh rate closest
838 	DPRINTK("Trying default video mode\n");
847 	DPRINTK("No valid mode found\n");
853  * @mode: pointer to struct fb_videomode
856 void fb_var_to_videomode(struct fb_videomode *mode,
861 	mode->name = NULL;
862 	mode->xres = var->xres;
863 	mode->yres = var->yres;
864 	mode->pixclock = var->pixclock;
865 	mode->hsync_len = var->hsync_len;
866 	mode->vsync_len = var->vsync_len;
867 	mode->left_margin = var->left_margin;
868 	mode->right_margin = var->right_margin;
869 	mode->upper_margin = var->upper_margin;
870 	mode->lower_margin = var->lower_margin;
871 	mode->sync = var->sync;
872 	mode->vmode = var->vmode & FB_VMODE_MASK;
873 	mode->flag = FB_MODE_IS_FROM_VAR;
874 	mode->refresh = 0;
895 	mode->refresh = hfreq/vtotal;
901  * @mode: pointer to struct fb_videomode
904 			 const struct fb_videomode *mode)
906 	var->xres = mode->xres;
907 	var->yres = mode->yres;
908 	var->xres_virtual = mode->xres;
909 	var->yres_virtual = mode->yres;
912 	var->pixclock = mode->pixclock;
913 	var->left_margin = mode->left_margin;
914 	var->right_margin = mode->right_margin;
915 	var->upper_margin = mode->upper_margin;
916 	var->lower_margin = mode->lower_margin;
917 	var->hsync_len = mode->hsync_len;
918 	var->vsync_len = mode->vsync_len;
919 	var->sync = mode->sync;
920 	var->vmode = mode->vmode & FB_VMODE_MASK;
968 	struct fb_videomode *mode, *best = NULL;
973 		mode = &modelist->mode;
975 		if (mode->xres >= var->xres && mode->yres >= var->yres) {
976 			d = (mode->xres - var->xres) +
977 				(mode->yres - var->yres);
980 				best = mode;
982 				   mode->refresh > best->refresh)
983 				best = mode;
992  * @mode: pointer to struct fb_videomode
999 const struct fb_videomode *fb_find_nearest_mode(const struct fb_videomode *mode,
1008 		cmode = &modelist->mode;
1010 		d = abs(cmode->xres - mode->xres) +
1011 			abs(cmode->yres - mode->yres);
1014 			diff_refresh = abs(cmode->refresh - mode->refresh);
1017 			d = abs(cmode->refresh - mode->refresh);
1040 	struct fb_videomode *m, mode;
1042 	fb_var_to_videomode(&mode, var);
1044 		m = &modelist->mode;
1045 		if (fb_mode_is_equal(m, &mode))
1053  * @mode: videomode to add
1057  * Will only add unmatched mode entries
1059 int fb_add_videomode(const struct fb_videomode *mode, struct list_head *head)
1066 		m = &modelist->mode;
1067 		if (fb_mode_is_equal(m, mode)) {
1078 		modelist->mode = *mode;
1086  * @mode: videomode to remove
1090  * Will remove all matching mode entries
1092 void fb_delete_videomode(const struct fb_videomode *mode,
1101 		m = &modelist->mode;
1102 		if (fb_mode_is_equal(m, mode)) {
1125  * fb_videomode_to_modelist - convert mode array to mode list
1153 	/* get the first detailed mode and the very first mode */
1155 		m = &modelist->mode;
1174 	/* find best mode based on display width and height */
1188 	/* use first detailed mode */
1194 	/* last resort, use the very first mode */