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udlfb: don't switch if we are switching to the same videomode

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The udlfb driver reprograms the hardware everytime the user switches the
console, that makes quite unusable when working on the console.

This patch makes the driver remember the videomode we are in and avoid
reprogramming the hardware if we switch to the same videomode.

We mask the "activate" field and the "FB_VMODE_SMOOTH_XPAN" flag when
comparing the videomode, because they cause spurious switches when
switching to and from the Xserver.

Signed-off-by: Mikulas Patocka <[email protected]>
Cc: [email protected]
Signed-off-by: Bartlomiej Zolnierkiewicz <[email protected]>
This commit is contained in:
Mikulas Patocka 2018-07-25 15:41:55 +02:00 • committed by Bartlomiej Zolnierkiewicz
commit 564f180737
2 changed files with 17 additions and 2 deletions
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18
drivers/video/fbdev/udlfb.c
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@ -1041,10 +1041,24 @@ static int dlfb_ops_set_par(struct fb_info *info)
int result;
u16 *pix_framebuffer;
int i;
struct fb_var_screeninfo fvs;
/* clear the activate field because it causes spurious miscompares */
fvs = info->var;
fvs.activate = 0;
fvs.vmode &= ~FB_VMODE_SMOOTH_XPAN;
if (!memcmp(&dlfb->current_mode, &fvs, sizeof(struct fb_var_screeninfo)))
return 0;
result = dlfb_set_video_mode(dlfb, &info->var);
if ((result == 0) && (dlfb->fb_count == 0)) {
if (result)
return result;
dlfb->current_mode = fvs;
if (dlfb->fb_count == 0) {
/* paint greenscreen */
@ -1056,7 +1070,7 @@ static int dlfb_ops_set_par(struct fb_info *info)
info->screen_base);
}
return result;
return 0;
}
/* To fonzi the jukebox (e.g. make blanking changes take effect) */