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author | Antonino A. Daplas <adaplas@gmail.com> | 2005-11-07 01:00:54 -0800 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-07 07:53:53 -0800 |
commit | 003cfc0c56977f1c3ce48ddfd2073b7c6d75a5d8 (patch) | |
tree | 71095d3b794a6d6294b898a496c8a4e8664066bf /drivers/video/modedb.c | |
parent | 14c8102ffc9d08aa86fb08ed4bdb005768650e44 (diff) | |
download | kernel_samsung_tuna-003cfc0c56977f1c3ce48ddfd2073b7c6d75a5d8.zip kernel_samsung_tuna-003cfc0c56977f1c3ce48ddfd2073b7c6d75a5d8.tar.gz kernel_samsung_tuna-003cfc0c56977f1c3ce48ddfd2073b7c6d75a5d8.tar.bz2 |
[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>
Diffstat (limited to 'drivers/video/modedb.c')
-rw-r--r-- | drivers/video/modedb.c | 60 |
1 files changed, 60 insertions, 0 deletions
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); |