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authorAntonino A. Daplas <adaplas@gmail.com>2005-11-07 01:00:54 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-07 07:53:53 -0800
commit003cfc0c56977f1c3ce48ddfd2073b7c6d75a5d8 (patch)
tree71095d3b794a6d6294b898a496c8a4e8664066bf
parent14c8102ffc9d08aa86fb08ed4bdb005768650e44 (diff)
[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>
-rw-r--r--drivers/video/modedb.c60
-rw-r--r--include/linux/fb.h2
2 files changed, 62 insertions, 0 deletions
diff --git a/drivers/video/modedb.c b/drivers/video/modedb.c
index aadef046ce7..1789a52d776 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 68a787914d8..e7ff98e395f 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);