fbcon: Fix accelerated fbdev scrolling while logo is still shown

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

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index d765bbd..cb8d94d 100644 (file)
--- 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,