This is a note to let you know that I've just added the patch titled
fbcon: Fix accelerated fbdev scrolling while logo is still shown
to the 5.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fbcon-fix-accelerated-fbdev-scrolling-while-logo-is-.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b98c086153d76fbbb9ccae4d4416547027db47db
Author: Helge Deller <deller@xxxxxx>
Date: Thu Jun 2 22:08:38 2022 +0200
fbcon: Fix accelerated fbdev scrolling while logo is still shown
[ Upstream commit 3866cba87dcd0162fb41e9b3b653d0af68fad5ec ]
There is no need to directly skip over to the SCROLL_REDRAW case while
the logo is still shown.
When using DRM, this change has no effect because the code will reach
the SCROLL_REDRAW case immediately anyway.
But if you run an accelerated fbdev driver and have
FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION enabled, console scrolling is
slowed down by factors so that it feels as if you use a 9600 baud
terminal.
So, drop those unnecessary checks and speed up fbdev console
acceleration during bootup.
Cc: stable@xxxxxxxxxxxxxxx # v5.10+
Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Helge Deller <deller@xxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/YpkYxk7wsBPx3po+@p100
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 1a9aa12cf886..1a1de5b4645c 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -1758,8 +1758,6 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
case SM_UP:
if (count > vc->vc_rows) /* Maximum realistic size */
count = vc->vc_rows;
- if (logo_shown >= 0)
- goto redraw_up;
switch (fb_scrollmode(p)) {
case SCROLL_MOVE:
fbcon_redraw_blit(vc, info, p, t, b - t - count,
@@ -1848,8 +1846,6 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
case SM_DOWN:
if (count > vc->vc_rows) /* Maximum realistic size */
count = vc->vc_rows;
- if (logo_shown >= 0)
- goto redraw_down;
switch (fb_scrollmode(p)) {
case SCROLL_MOVE:
fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
