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Peter Collingbourne 112c35237c Partially revert "video: fbdev: amba-clcd: Retire elder CLCD driver" 
Also partially revert the follow-up change "drm: pl111: Absorb the
external register header".

This reverts the parts of commits
7e4e589db7 and
0fb8125635 that touch paths outside
of drivers/gpu/drm/pl111.

The fbdev driver is used by Android's FVP configuration. Using the
DRM driver together with DRM's fbdev emulation results in a failure
to boot Android. The root cause is that Android's generic fbdev
userspace driver relies on the ability to set the pixel format via
FBIOPUT_VSCREENINFO, which is not supported by fbdev emulation.

There have been other less critical behavioral differences identified
between the fbdev driver and the DRM driver with fbdev emulation. The
DRM driver exposes different values for the panel's width, height and
refresh rate, and the DRM driver fails a FBIOPUT_VSCREENINFO syscall
with yres_virtual greater than the maximum supported value instead
of letting the syscall succeed and setting yres_virtual based on yres.

Signed-off-by: Peter Collingbourne <pcc@google.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200929195344.2219796-1-pcc@google.com
2020-09-30 16:37:39 +02:00
arch powerpc fixes for 5.9 #3 2020-08-23 11:37:23 -07:00
block
certs
crypto
Documentation Documentation: fix dma-buf.rst underline length warning 2020-09-01 09:59:53 +02:00
drivers Partially revert "video: fbdev: amba-clcd: Retire elder CLCD driver" 2020-09-30 16:37:39 +02:00
fs Merge branch 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-22 17:11:38 -07:00
include Partially revert "video: fbdev: amba-clcd: Retire elder CLCD driver" 2020-09-30 16:37:39 +02:00
init
ipc
kernel A single bug fix for the common entry code. The transcript of the x86 2020-08-23 11:05:47 -07:00
lib Fonts: Support FONT_EXTRA_WORDS macros for built-in fonts 2020-09-25 10:28:51 +02:00
LICENSES
mm
net net: nexthop: don't allow empty NHA_GROUP 2020-08-22 12:39:55 -07:00
samples
scripts
security
sound
tools Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-23 10:52:33 -07:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
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COPYING
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Kbuild
Kconfig
MAINTAINERS Partially revert "video: fbdev: amba-clcd: Retire elder CLCD driver" 2020-09-30 16:37:39 +02:00
Makefile Linux 5.9-rc2 2020-08-23 14:08:43 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.