This series reverts two patches which disabled scrolling acceleration in
fbcon/fbdev. Those patches introduced a regression for fbdev-supported graphic
cards because of the performance penalty by doing screen scrolling by software
instead of using existing 2D hardware acceleration.
This series has been discussed on linux-fbdev, dri-devel and linux-kernel
mailing lists. The consensus is that they will be reverted, but in addition
it's being worked on to find a solution which allows to disable parts of the
classic fbdev hardware acceleration code which isn't needed in DRM-only
configurations.
The patchset is planned to be kept in fbdev's for-next git branch and later
pushed into kernel v5.18 if no issues are found until then.
Helge
---
Changes in v2 compared to v1:
- adjusted the stable tags (one v5.10+, the other v5.16+)
- moved the analysis and reasoning why those should be reverted into
the commit message. That simplifies to analyze later why they were
reverted.
- resorted the To an Cc mail recipient lists
Helge Deller (2):
Revert "fbdev: Garbage collect fbdev scrolling acceleration, part 1
(from TODO list)"
Revert "fbcon: Disable accelerated scrolling"
Documentation/gpu/todo.rst | 24 --
drivers/video/fbdev/core/bitblit.c | 16 +
drivers/video/fbdev/core/fbcon.c | 540 +++++++++++++++++++++++-
drivers/video/fbdev/core/fbcon.h | 59 +++
drivers/video/fbdev/core/fbcon_ccw.c | 28 +-
drivers/video/fbdev/core/fbcon_cw.c | 28 +-
drivers/video/fbdev/core/fbcon_rotate.h | 9 +
drivers/video/fbdev/core/fbcon_ud.c | 37 +-
drivers/video/fbdev/core/tileblit.c | 16 +
drivers/video/fbdev/skeletonfb.c | 12 +-
include/linux/fb.h | 2 +-
11 files changed, 703 insertions(+), 68 deletions(-)
--
2.31.1
