[PATCH] framebuffer: new driver for cyberblade/i1 graphics core

This is a framebuffer driver for the Cyberblade/i1 graphics core.

Currently tridenfb claims to support the cyberblade/i1 graphics core.  This
is of very limited truth.  Even vesafb is faster and provides more working
modes and a much better quality of the video signal.  There is a great
number of bugs in tridentfb ...  but most often it is impossible to decide
if these bugs are real bugs or if fixing them for the cyberblade/i1 core
would break support for one of the other supported chips.

Tridentfb seems to be unmaintained,and documentation for most of the
supported chips is not available.  So "fixing" cyberblade/i1 support inside
of tridentfb was not an option, it would have caused numerous
if(CYBERBLADEi1) else ...  cases and would have rendered the code to be
almost unmaintainable.

A first version of this driver was published on 2005-07-31.  A fix for a
bug reported by Jochen Hein was integrated as well as some changes
requested by Antonino A.  Daplas.

A message has been added to tridentfb to inform current users of tridentfb
to switch to cyblafb if the cyberblade/i1 graphics core is detected.

This patch is one logical change, but because of the included documentation
it is bigger than 70kb.  Therefore it is not sent to lkml and
linux-fbdev-devel,

Signed-off-by: Knut Petersen <Knut_Petersen@t-online.de>
Cc: Muli Ben-Yehuda <mulix@mulix.org>
Acked-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/Documentation/fb/cyblafb/todo b/Documentation/fb/cyblafb/todo
new file mode 100644
index 000000000000..80fb2f89b6c1
--- /dev/null
+++ b/Documentation/fb/cyblafb/todo
@@ -0,0 +1,32 @@
+TODO / Missing features
+=======================
+
+Verify LCD stuff                "stretch" and "center" options are
+                                completely untested ... this code needs to be
+                                verified. As I don't have access to such
+                                hardware, please contact me if you are
+                                willing run some tests.
+
+Interlaced video modes          The reason that interleaved
+                                modes are disabled is that I do not know
+                                the meaning of the vertical interlace
+                                parameter. Also the datasheet mentions a
+                                bit d8 of a horizontal interlace parameter,
+                                but nowhere the lower 8 bits. Please help
+                                if you can.
+
+low-res double scan modes       Who needs it?
+
+accelerated color blitting      Who needs it? The console driver does use color
+                                blitting for nothing but drawing the penguine,
+                                everything else is done using color expanding
+                                blitting of 1bpp character bitmaps.
+
+xpanning                        Who needs it?
+
+ioctls                          Who needs it?
+
+TV-out                          Will be done later
+
+???                             Feel free to contact me if you have any
+                                feature requests