p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

udlfb: fix display corruption of the last line 

The displaylink hardware has such a peculiarity that it doesn't render a
command until next command is received. This produces occasional
corruption, such as when setting 22x11 font on the console, only the first
line of the cursor will be blinking if the cursor is located at some
specific columns.

When we end up with a repeating pixel, the driver has a bug that it leaves
one uninitialized byte after the command (and this byte is enough to flush
the command and render it - thus it fixes the screen corruption), however
whe we end up with a non-repeating pixel, there is no byte appended and
this results in temporary screen corruption.

This patch fixes the screen corruption by always appending a byte 0xAF at
the end of URB. It also removes the uninitialized byte.

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 15:41:54 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 9d0aa601e4
commit 4e705e17ce
1 changed files with 20 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/video/fbdev/udlfb.c
View File

@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/prefetch.h>
#include <linux/delay.h>
#include <asm/unaligned.h>
#include <video/udlfb.h>
#include "edid.h"
@ -450,17 +451,17 @@ static void dlfb_compress_hline(
raw_pixels_count_byte = cmd++; /* we'll know this later */
raw_pixel_start = pixel;
cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1,
min((int)(pixel_end - pixel),
(int)(cmd_buffer_end - cmd) / BPP));
cmd_pixel_end = pixel + min3(MAX_CMD_PIXELS + 1UL,
(unsigned long)(pixel_end - pixel),
(unsigned long)(cmd_buffer_end - 1 - cmd) / BPP);
prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * BPP);
prefetch_range((void *) pixel, (u8 *)cmd_pixel_end - (u8 *)pixel);
while (pixel < cmd_pixel_end) {
const uint16_t * const repeating_pixel = pixel;
*cmd++ = *pixel >> 8;
*cmd++ = *pixel;
put_unaligned_be16(*pixel, cmd);
cmd += 2;
pixel++;
if (unlikely((pixel < cmd_pixel_end) &&
@ -486,13 +487,16 @@ static void dlfb_compress_hline(
if (pixel > raw_pixel_start) {
/* finalize last RAW span */
*raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF;
} else {
/* undo unused byte */
cmd--;
}
*cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF;
dev_addr += (pixel - cmd_pixel_start) * BPP;
dev_addr += (u8 *)pixel - (u8 *)cmd_pixel_start;
}
if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) {
if (cmd_buffer_end - MIN_RLX_CMD_BYTES <= cmd) {
/* Fill leftover bytes with no-ops */
if (cmd_buffer_end > cmd)
memset(cmd, 0xAF, cmd_buffer_end - cmd);
@ -610,8 +614,11 @@ static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y,
}
if (cmd > (char *) urb->transfer_buffer) {
int len;
if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length)
*cmd++ = 0xAF;
/* Send partial buffer remaining before exiting */
int len = cmd - (char *) urb->transfer_buffer;
len = cmd - (char *) urb->transfer_buffer;
ret = dlfb_submit_urb(dlfb, urb, len);
bytes_sent += len;
} else
@ -735,8 +742,11 @@ static void dlfb_dpy_deferred_io(struct fb_info *info,
}
if (cmd > (char *) urb->transfer_buffer) {
int len;
if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length)
*cmd++ = 0xAF;
/* Send partial buffer remaining before exiting */
int len = cmd - (char *) urb->transfer_buffer;
len = cmd - (char *) urb->transfer_buffer;
dlfb_submit_urb(dlfb, urb, len);
bytes_sent += len;
} else