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Commit 1c5dd170 authored by Michal Januszewski's avatar Michal Januszewski Committed by Linus Torvalds
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fbdev: find mode with the highest/safest refresh rate in fb_find_mode() 



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: default avatarMichal Januszewski <spock@gentoo.org>
Signed-off-by: default avatarAntonino Daplas <adaplas@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 10b98368

drivers/video/modedb.c

+29 −12
Original line number Diff line number Diff line
@@ -606,26 +606,43 @@ int fb_find_mode(struct fb_var_screeninfo *var, 
	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)

		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(diff > abs(db[i].refresh - refresh)) {

			} 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;