[PATCH 01/12] fbdev: find mode with the highest/safest refresh rate in fb_find_mode()
DORMANTno replies
From: "Antonino A. Daplas" <adaplas@gmail.com>
Date: 2007-09-15 00:09:52
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
From: Michal Januszewski <spock@gentoo.org> Currently, if the refresh rate is not specified, fb_find_mode() returns the first known video mode with the requested resolution, which provides no guarantees wrt the refresh rate. Change this so that the mode with the highest refresh rate is returned when the driver provides a custom video mode database and the monitor limits, and a mode with the safe 60 Hz refresh rate otherwise. Signed-off-by: Michal Januszewski <spock@gentoo.org> Signed-off-by: Antonino Daplas <adaplas@gmail.com> --- drivers/video/modedb.c | 41 +++++++++++++++++++++++++++++------------ 1 files changed, 29 insertions(+), 12 deletions(-)
diff --git a/drivers/video/modedb.c b/drivers/video/modedb.c
index f7f9c08..03b06aa 100644
--- a/drivers/video/modedb.c
+++ b/drivers/video/modedb.c@@ -606,26 +606,43 @@ done: DPRINTK("Trying specified video mode%s %ix%i\n", refresh_specified ? "" : " (ignoring refresh rate)", xres, yres); - diff = refresh; + if (!refresh_specified) { + /* + * If the caller has provided a custom mode database and a + * valid monspecs structure, we look for the mode with the + * highest refresh rate. Otherwise we play it safe it and + * try to find a mode with a refresh rate closest to the + * standard 60 Hz. + */ + if (db != modedb && + info->monspecs.vfmin && info->monspecs.vfmax && + info->monspecs.hfmin && info->monspecs.hfmax && + info->monspecs.dclkmax) { + refresh = 1000; + } else { + refresh = 60; + } + } + + diff = -1; best = -1; for (i = 0; i < dbsize; i++) { - if (name_matches(db[i], name, namelen) || - (res_specified && res_matches(db[i], xres, yres))) { - if(!fb_try_mode(var, info, &db[i], bpp)) { - if(!refresh_specified || db[i].refresh == refresh) - return 1; - else { - if(diff > abs(db[i].refresh - refresh)) { - diff = abs(db[i].refresh - refresh); - best = i; - } + if ((name_matches(db[i], name, namelen) || + (res_specified && res_matches(db[i], xres, yres))) && + !fb_try_mode(var, info, &db[i], bpp)) { + if (refresh_specified && db[i].refresh == refresh) { + return 1; + } else { + if (abs(db[i].refresh - refresh) < diff) { + diff = abs(db[i].refresh - refresh); + best = i; } } } } if (best != -1) { fb_try_mode(var, info, &db[best], bpp); - return 2; + return (refresh_specified) ? 2 : 1; } diff = xres + yres; -------------------------------------------------------------------------
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