[PATCH] fbdev: Add helper to get an appropriate initial mode
Add new helper, fb_find_best_display(), which will search the modelist for the best mode for the attached display. This requires an EDID block that is converted to struct fb_monspecs and a private modelist. The search will be done in this manner: - if 1st detailed timing is preferred, use that - else if dimensions of the display are known, use that to estimate xres and - else if modelist has detailed timings, use the first detailed timing - else, use the very first entry from the modelist Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -944,6 +944,66 @@ void fb_videomode_to_modelist(struct fb_videomode *modedb, int num,
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}
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}
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struct fb_videomode *fb_find_best_display(struct fb_monspecs *specs,
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struct list_head *head)
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{
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struct list_head *pos;
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struct fb_modelist *modelist;
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struct fb_videomode *m, *m1 = NULL, *md = NULL, *best = NULL;
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int first = 0;
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if (!head->prev || !head->next || list_empty(head))
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goto finished;
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/* get the first detailed mode and the very first mode */
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list_for_each(pos, head) {
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modelist = list_entry(pos, struct fb_modelist, list);
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m = &modelist->mode;
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if (!first) {
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m1 = m;
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first = 1;
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}
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if (m->flag & FB_MODE_IS_FIRST) {
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md = m;
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break;
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}
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}
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/* first detailed timing is preferred */
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if (specs->misc & FB_MISC_1ST_DETAIL) {
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best = md;
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goto finished;
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}
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/* find best mode based on display width and height */
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if (specs->max_x && specs->max_y) {
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struct fb_var_screeninfo var;
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memset(&var, 0, sizeof(struct fb_var_screeninfo));
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var.xres = (specs->max_x * 7200)/254;
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var.yres = (specs->max_y * 7200)/254;
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m = fb_find_best_mode(&var, head);
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if (m) {
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best = m;
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goto finished;
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}
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}
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/* use first detailed mode */
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if (md) {
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best = md;
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goto finished;
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}
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/* last resort, use the very first mode */
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best = m1;
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finished:
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return best;
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}
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EXPORT_SYMBOL(fb_find_best_display);
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EXPORT_SYMBOL(fb_videomode_to_var);
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EXPORT_SYMBOL(fb_var_to_videomode);
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EXPORT_SYMBOL(fb_mode_is_equal);
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@ -902,6 +902,8 @@ extern struct fb_videomode *fb_find_nearest_mode(struct fb_videomode *mode,
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extern void fb_destroy_modelist(struct list_head *head);
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extern void fb_videomode_to_modelist(struct fb_videomode *modedb, int num,
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struct list_head *head);
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extern struct fb_videomode *fb_find_best_display(struct fb_monspecs *specs,
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struct list_head *head);
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/* drivers/video/fbcmap.c */
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extern int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp);
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