]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
imxfb: fast read flag and nonstandard field configurable
authorPavel Pisa <pisa@cmp.felk.cvut.cz>
Tue, 16 Oct 2007 08:29:44 +0000 (01:29 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 16 Oct 2007 16:43:21 +0000 (09:43 -0700)
commit9da505d1f9d8facbb688d28dfb6d9fc8edfd5c4a
treed8c4ef21015f64c3d61cd6be14859d8a67705963
parentce4c371a9de1f5b9e1d15f9d59c5f7d079bcd6d7
imxfb: fast read flag and nonstandard field configurable

The i.MX frame-buffer read operation should be faster for all configurations
then drawing each individual character again in response to scroll events.

The nonstandard fields allows to configure frame-buffer special options flags
for different display configurations by board specific initialization code.

One of such specific options is reversed order of pixels in each individual
byte.  i.MX frame-buffer seems to be designed for big-endian use first.  The
byte order is correctly configured for little-endian ordering, but if 1, 2 or
4 bits per pixel are used, pixels ordering is incompatible to Linux generic
frame-buffer drawing functions.

The patch "Allow generic BitBLT functions to work with swapped pixel order in
bytes" introduces required functionality into FBDEV core.  The pixels ordering
selection has to be enabled at compile time CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
and for each display configuration which requires it by flag
FB_NONSTD_REV_PIX_IN_B in "nonstd" field of info structure.

This patch provides way for board specific code to select this option.

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/video/imxfb.c
include/asm-arm/arch-imx/imxfb.h