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authorMikulas Patocka <mpatocka@redhat.com>2018-07-25 16:41:55 +0300
committerBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>2018-07-25 16:41:55 +0300
commit564f1807379298dfdb12ed0d5b25fcb89c238527 (patch)
tree88294f6efc7842f271350c630c38f894adf14497 /drivers/video
parent4e705e17ce3409a1f492cfd5dadcf6a4f6075842 (diff)
downloadlinux-564f1807379298dfdb12ed0d5b25fcb89c238527.tar.xz
udlfb: don't switch if we are switching to the same videomode
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 <mpatocka@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/fbdev/udlfb.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/video/fbdev/udlfb.c b/drivers/video/fbdev/udlfb.c
index 864e2917c276..fa63a2e359d6 100644
--- a/drivers/video/fbdev/udlfb.c
+++ b/drivers/video/fbdev/udlfb.c
@@ -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) */