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@xxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
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@xxxxxxxx>
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
