On Thu, Jun 02, 2022 at 10:08:38PM +0200, Helge Deller wrote:

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.

Signed-off-by: Helge Deller deller@gmx.de Cc: stable@vger.kernel.org

I'm not entirely sure this is 100% perfect, but I don't think it'll make anything worse, so

Acked-by: Daniel Vetter daniel.vetter@ffwll.ch

I'm assuming you'll push this to drm-misc-fixes? I pinged drm-misc maintainers to make sure that tree is forwarded to -rc1. -Daniel

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index c2f9e5711c39..8eb5b73e98bc 100644 --- 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 *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,

@@ -1796,8 +1794,6 @@ 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,