leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source 
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>
This commit is contained in:
Mikulas Patocka 2018-07-25 15:41:55 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 4e705e17ce
commit 564f180737
2 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/video/fbdev/udlfb.c
View File

@ -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) */

1
include/video/udlfb.h
View File

@ -56,6 +56,7 @@ struct dlfb_data {
atomic_t bytes_identical; /* saved effort with backbuffer comparison */
atomic_t bytes_sent; /* to usb, after compression including overhead */
atomic_t cpu_kcycles_used; /* transpired during pixel processing */
struct fb_var_screeninfo current_mode;
};
#define NR_USB_REQUEST_I2C_SUB_IO 0x02