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 <del...@gmx.de>
> Cc: sta...@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.vet...@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,

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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