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From:   Helge Deller <deller@gmx.de>
To:     dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org
Cc:     Javier Martinez Canillas <javierm@redhat.com>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Gerd Hoffmann <kraxel@redhat.com>,
        Sven Schnelle <svens@stackframe.org>,
        Claudio Suarez <cssk@net-c.es>, Pavel Machek <pavel@ucw.cz>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Tomi Valkeinen <tomi.valkeinen@ti.com>,
        Ilia Mirkin <imirkin@alum.mit.edu>,
        Sam Ravnborg <sam@ravnborg.org>,
        Daniel Vetter <daniel.vetter@intel.com>
Subject: [PATCH v2 0/2] Fix regression introduced by disabling accelerated scrolling in fbcon
Date:   Mon, 24 Jan 2022 22:03:17 +0100
Message-Id: <20220124210319.325512-1-deller@gmx.de>
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This series reverts two patches which disabled scrolling acceleration in=0D
fbcon/fbdev. Those patches introduced a regression for fbdev-supported grap=
hic=0D
cards because of the performance penalty by doing screen scrolling by softw=
are=0D
instead of using existing 2D hardware acceleration.=0D
=0D
This series has been discussed on linux-fbdev, dri-devel and linux-kernel=0D
mailing lists. The consensus is that they will be reverted, but in addition=
=0D
it's being worked on to find a solution which allows to disable parts of th=
e=0D
classic fbdev hardware acceleration code which isn't needed in DRM-only=0D
configurations.=0D
=0D
The patchset is planned to be kept in fbdev's for-next git branch and later=
=0D
pushed into kernel v5.18 if no issues are found until then.=0D
=0D
Helge=0D
=0D
---=0D
Changes in v2 compared to v1:=0D
- adjusted the stable tags (one v5.10+, the other v5.16+)=0D
- moved the analysis and reasoning why those should be reverted into=0D
  the commit message. That simplifies to analyze later why they were=0D
  reverted.=0D
- resorted the To an Cc mail recipient lists=0D
=0D
Helge Deller (2):=0D
  Revert "fbdev: Garbage collect fbdev scrolling acceleration, part 1=0D
    (from TODO list)"=0D
  Revert "fbcon: Disable accelerated scrolling"=0D
=0D
 Documentation/gpu/todo.rst              |  24 --=0D
 drivers/video/fbdev/core/bitblit.c      |  16 +=0D
 drivers/video/fbdev/core/fbcon.c        | 540 +++++++++++++++++++++++-=0D
 drivers/video/fbdev/core/fbcon.h        |  59 +++=0D
 drivers/video/fbdev/core/fbcon_ccw.c    |  28 +-=0D
 drivers/video/fbdev/core/fbcon_cw.c     |  28 +-=0D
 drivers/video/fbdev/core/fbcon_rotate.h |   9 +=0D
 drivers/video/fbdev/core/fbcon_ud.c     |  37 +-=0D
 drivers/video/fbdev/core/tileblit.c     |  16 +=0D
 drivers/video/fbdev/skeletonfb.c        |  12 +-=0D
 include/linux/fb.h                      |   2 +-=0D
 11 files changed, 703 insertions(+), 68 deletions(-)=0D
=0D
-- =0D
2.31.1=0D
=0D