[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>
diff --git a/Documentation/fb/cyblafb/performance b/Documentation/fb/cyblafb/performance
new file mode 100644
index 0000000..eb4e47a
--- /dev/null
+++ b/Documentation/fb/cyblafb/performance
@@ -0,0 +1,80 @@
+Speed
+=====
+
+CyBlaFB is much faster than tridentfb and vesafb. Compare the performance data
+for mode 1280x1024-[8,16,32]@61 Hz.
+
+Test 1: Cat a file with 2000 lines of 0 characters.
+Test 2: Cat a file with 2000 lines of 80 characters.
+Test 3: Cat a file with 2000 lines of 160 characters.
+
+All values show system time use in seconds, kernel 2.6.12 was used for
+the measurements. 2.6.13 is a bit slower, 2.6.14 hopefully will include a
+patch that speeds up kernel bitblitting a lot ( > 20%).
+
++-----------+-----------------------------------------------------+
+| | not accelerated |
+| TRIDENTFB +-----------------+-----------------+-----------------+
+| of 2.6.12 | 8 bpp | 16 bpp | 32 bpp |
+| | noypan | ypan | noypan | ypan | noypan | ypan |
++-----------+--------+--------+--------+--------+--------+--------+
+| Test 1 | 4.31 | 4.33 | 6.05 | 12.81 | ---- | ---- |
+| Test 2 | 67.94 | 5.44 | 123.16 | 14.79 | ---- | ---- |
+| Test 3 | 131.36 | 6.55 | 240.12 | 16.76 | ---- | ---- |
++-----------+--------+--------+--------+--------+--------+--------+
+| Comments | | | completely bro- |
+| | | | ken, monitor |
+| | | | switches off |
++-----------+-----------------+-----------------+-----------------+
+
+
++-----------+-----------------------------------------------------+
+| | accelerated |
+| TRIDENTFB +-----------------+-----------------+-----------------+
+| of 2.6.12 | 8 bpp | 16 bpp | 32 bpp |
+| | noypan | ypan | noypan | ypan | noypan | ypan |
++-----------+--------+--------+--------+--------+--------+--------+
+| Test 1 | ---- | ---- | 20.62 | 1.22 | ---- | ---- |
+| Test 2 | ---- | ---- | 22.61 | 3.19 | ---- | ---- |
+| Test 3 | ---- | ---- | 24.59 | 5.16 | ---- | ---- |
++-----------+--------+--------+--------+--------+--------+--------+
+| Comments | broken, writing | broken, ok only | completely bro- |
+| | to wrong places | if bgcolor is | ken, monitor |
+| | on screen + bug | black, bug in | switches off |
+| | in fillrect() | fillrect() | |
++-----------+-----------------+-----------------+-----------------+
+
+
++-----------+-----------------------------------------------------+
+| | not accelerated |
+| VESAFB +-----------------+-----------------+-----------------+
+| of 2.6.12 | 8 bpp | 16 bpp | 32 bpp |
+| | noypan | ypan | noypan | ypan | noypan | ypan |
++-----------+--------+--------+--------+--------+--------+--------+
+| Test 1 | 4.26 | 3.76 | 5.99 | 7.23 | ---- | ---- |
+| Test 2 | 65.65 | 4.89 | 120.88 | 9.08 | ---- | ---- |
+| Test 3 | 126.91 | 5.94 | 235.77 | 11.03 | ---- | ---- |
++-----------+--------+--------+--------+--------+--------+--------+
+| Comments | vga=0x307 | vga=0x31a | vga=0x31b not |
+| | fh=80kHz | fh=80kHz | supported by |
+| | fv=75kHz | fv=75kHz | video BIOS and |
+| | | | hardware |
++-----------+-----------------+-----------------+-----------------+
+
+
++-----------+-----------------------------------------------------+
+| | accelerated |
+| CYBLAFB +-----------------+-----------------+-----------------+
+| | 8 bpp | 16 bpp | 32 bpp |
+| | noypan | ypan | noypan | ypan | noypan | ypan |
++-----------+--------+--------+--------+--------+--------+--------+
+| Test 1 | 8.02 | 0.23 | 19.04 | 0.61 | 57.12 | 2.74 |
+| Test 2 | 8.38 | 0.55 | 19.39 | 0.92 | 57.54 | 3.13 |
+| Test 3 | 8.73 | 0.86 | 19.74 | 1.24 | 57.95 | 3.51 |
++-----------+--------+--------+--------+--------+--------+--------+
+| Comments | | | |
+| | | | |
+| | | | |
+| | | | |
++-----------+-----------------+-----------------+-----------------+
+