projects/linux·commit 9da505d1

imxfb: fast read flag and nonstandard field configurable

9da505d1 · Pavel Pisa <[email protected]> · 2007-10-16 01:29:44 -07:00

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 <[email protected]>
Signed-off-by: Antonino Daplas <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Commit
9da505d1f9d8facbb688d28dfb6d9fc8edfd5c4a
Parents
ce4c371a

Changes

2 files changed · +3 −1

FileStatusAddDelContent
drivers/video/imxfb.cmodified+2−1View file
include/asm-arm/arch-imx/imxfb.hmodified+1−0View file

drivers/video/imxfb.c

View file
diff --git a/drivers/video/imxfb.c b/drivers/video/imxfb.c
index 986ffa6..1160955 100644
--- a/drivers/video/imxfb.c
+++ b/drivers/video/imxfb.c
@@ -466,7 +466,7 @@ static int __init imxfb_init_fbinfo(struct device *dev)
info->var.vmode = FB_VMODE_NONINTERLACED;
info->fbops = &imxfb_ops;
- info->flags = FBINFO_FLAG_DEFAULT;
+ info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
fbi->rgb[RGB_16] = &def_rgb_16;
fbi->rgb[RGB_8] = &def_rgb_8;
@@ -479,6 +479,7 @@ static int __init imxfb_init_fbinfo(struct device *dev)
info->var.yres_virtual = inf->yres;
fbi->max_bpp = inf->bpp;
info->var.bits_per_pixel = inf->bpp;
+ info->var.nonstd = inf->nonstd;
info->var.pixclock = inf->pixclock;
info->var.hsync_len = inf->hsync_len;
info->var.left_margin = inf->left_margin;

include/asm-arm/arch-imx/imxfb.h

View file
diff --git a/include/asm-arm/arch-imx/imxfb.h b/include/asm-arm/arch-imx/imxfb.h
index 7dbc7bb..3ed9ec8 100644
--- a/include/asm-arm/arch-imx/imxfb.h
+++ b/include/asm-arm/arch-imx/imxfb.h
@@ -7,6 +7,7 @@ struct imxfb_mach_info {
u_short xres;
u_short yres;
+ u_int nonstd;
u_char bpp;
u_char hsync_len;
u_char left_margin;