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: NPavel Pisa <pisa@cmp.felk.cvut.cz>
Signed-off-by: NAntonino Daplas <adaplas@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

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

@@ -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;