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[ARM] amba-clcd: Allow RGB555 and RGB565 with 16bpp 

Some folk want to use RGB555 rather tahn RGB565 with amba-clcd.
Allow amba-clcd to accept either pixel format.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2006-01-26 14:12:06 +00:00 committed by Russell King
parent 20a2c88f50
commit c43e6f027d
1 changed files with 29 additions and 25 deletions
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54
drivers/video/amba-clcd.c
View File

@ -116,9 +116,10 @@ clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
int ret = 0;
memset(&var->transp, 0, sizeof(var->transp));
memset(&var->red, 0, sizeof(var->red));
memset(&var->green, 0, sizeof(var->green));
memset(&var->blue, 0, sizeof(var->blue));
var->red.msb_right = 0;
var->green.msb_right = 0;
var->blue.msb_right = 0;
switch (var->bits_per_pixel) {
case 1:
@ -133,34 +134,20 @@ clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
var->blue.offset = 0;
break;
case 16:
var->red.length = 5;
var->green.length = 6;
var->blue.length = 5;
if (fb->panel->cntl & CNTL_BGR) {
var->red.offset = 11;
var->green.offset = 5;
var->blue.offset = 0;
} else {
var->red.offset = 0;
var->green.offset = 5;
var->blue.offset = 11;
}
var->red.length = 5;
var->blue.length = 5;
/*
* Green length can be 5 or 6 depending whether
* we're operating in RGB555 or RGB565 mode.
*/
if (var->green.length != 5 && var->green.length != 6)
var->green.length = 6;
break;
case 32:
if (fb->panel->cntl & CNTL_LCDTFT) {
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
if (fb->panel->cntl & CNTL_BGR) {
var->red.offset = 16;
var->green.offset = 8;
var->blue.offset = 0;
} else {
var->red.offset = 0;
var->green.offset = 8;
var->blue.offset = 16;
}
break;
}
default:
@ -168,6 +155,23 @@ clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
break;
}
/*
* >= 16bpp displays have separate colour component bitfields
* encoded in the pixel data. Calculate their position from
* the bitfield length defined above.
*/
if (ret == 0 && var->bits_per_pixel >= 16) {
if (fb->panel->cntl & CNTL_BGR) {
var->blue.offset = 0;
var->green.offset = var->blue.offset + var->blue.length;
var->red.offset = var->green.offset + var->green.length;
} else {
var->red.offset = 0;
var->green.offset = var->red.offset + var->red.length;
var->blue.offset = var->green.offset + var->green.length;
}
}
return ret;
}