| From 3866cba87dcd0162fb41e9b3b653d0af68fad5ec Mon Sep 17 00:00:00 2001 |
| From: Helge Deller <deller@gmx.de> |
| Date: Thu, 2 Jun 2022 22:08:38 +0200 |
| Subject: fbcon: Fix accelerated fbdev scrolling while logo is still shown |
| |
| From: Helge Deller <deller@gmx.de> |
| |
| commit 3866cba87dcd0162fb41e9b3b653d0af68fad5ec upstream. |
| |
| 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@vger.kernel.org # v5.10+ |
| Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> |
| Signed-off-by: Helge Deller <deller@gmx.de> |
| Link: https://patchwork.freedesktop.org/patch/msgid/YpkYxk7wsBPx3po+@p100 |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| drivers/video/fbdev/core/fbcon.c | 4 ---- |
| 1 file changed, 4 deletions(-) |
| |
| --- a/drivers/video/fbdev/core/fbcon.c |
| +++ b/drivers/video/fbdev/core/fbcon.c |
| @@ -1706,8 +1706,6 @@ static bool fbcon_scroll(struct vc_data |
| 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, |
| @@ -1796,8 +1794,6 @@ static bool fbcon_scroll(struct vc_data |
| 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, |
