From 003cfc0c56977f1c3ce48ddfd2073b7c6d75a5d8 Mon Sep 17 00:00:00 2001 From: "Antonino A. Daplas" Date: Mon, 7 Nov 2005 01:00:54 -0800 Subject: [PATCH] [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/modedb.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/fb.h | 2 ++ 2 files changed, 62 insertions(+) diff --git a/drivers/video/modedb.c b/drivers/video/modedb.c index aadef04..1789a52 100644 --- a/drivers/video/modedb.c +++ b/drivers/video/modedb.c @@ -944,6 +944,66 @@ void fb_videomode_to_modelist(struct fb_videomode *modedb, int num, } } +struct fb_videomode *fb_find_best_display(struct fb_monspecs *specs, + struct list_head *head) +{ + struct list_head *pos; + struct fb_modelist *modelist; + struct fb_videomode *m, *m1 = NULL, *md = NULL, *best = NULL; + int first = 0; + + if (!head->prev || !head->next || list_empty(head)) + goto finished; + + /* get the first detailed mode and the very first mode */ + list_for_each(pos, head) { + modelist = list_entry(pos, struct fb_modelist, list); + m = &modelist->mode; + + if (!first) { + m1 = m; + first = 1; + } + + if (m->flag & FB_MODE_IS_FIRST) { + md = m; + break; + } + } + + /* first detailed timing is preferred */ + if (specs->misc & FB_MISC_1ST_DETAIL) { + best = md; + goto finished; + } + + /* find best mode based on display width and height */ + if (specs->max_x && specs->max_y) { + struct fb_var_screeninfo var; + + memset(&var, 0, sizeof(struct fb_var_screeninfo)); + var.xres = (specs->max_x * 7200)/254; + var.yres = (specs->max_y * 7200)/254; + m = fb_find_best_mode(&var, head); + if (m) { + best = m; + goto finished; + } + } + + /* use first detailed mode */ + if (md) { + best = md; + goto finished; + } + + /* last resort, use the very first mode */ + best = m1; +finished: + return best; +} +EXPORT_SYMBOL(fb_find_best_display); + EXPORT_SYMBOL(fb_videomode_to_var); EXPORT_SYMBOL(fb_var_to_videomode); EXPORT_SYMBOL(fb_mode_is_equal); diff --git a/include/linux/fb.h b/include/linux/fb.h index 68a7879..e7ff98e 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -902,6 +902,8 @@ extern struct fb_videomode *fb_find_nearest_mode(struct fb_videomode *mode, extern void fb_destroy_modelist(struct list_head *head); extern void fb_videomode_to_modelist(struct fb_videomode *modedb, int num, struct list_head *head); +extern struct fb_videomode *fb_find_best_display(struct fb_monspecs *specs, + struct list_head *head); /* drivers/video/fbcmap.c */ extern int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp); -- 1.8.2.3