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atmel_lcdfb: wiring BGR to RGB color mode

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Adds different wiring mode for the LCD screen.

The legacy atmel LCDC IP uses a non standard color mode, "BGR-555.1" instead
"RGB-565".  The major part of graphic stacks for embedded systems uses only
"RGB-565".  It is possible to swap LCD IOs instead of doing this bit swapping
by software (See application note AT91SAM9 LCD Controller
http://www.atmel.com/dyn/resources/prod_documents/doc6300.pdf)

This wire swapping is done on the at91sam9rl-ek board (board code
using this patch will come later).

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Andrew Victor <avictor.za@gmail.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nicolas Ferre 2008-04-28 02:15:21 -07:00 committed by Linus Torvalds
parent cf19a37e06
commit fd0858017e
2 changed files with 32 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
drivers/video/atmel_lcdfb.c
View file

@ -338,19 +338,35 @@ static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
break;
case 15:
case 16:
var->red.offset = 0;
if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
/* RGB:565 mode */
var->red.offset = 11;
var->blue.offset = 0;
var->green.length = 6;
} else {
/* BGR:555 mode */
var->red.offset = 0;
var->blue.offset = 10;
var->green.length = 5;
}
var->green.offset = 5;
var->blue.offset = 10;
var->red.length = var->green.length = var->blue.length = 5;
var->red.length = var->blue.length = 5;
break;
case 32:
var->transp.offset = 24;
var->transp.length = 8;
/* fall through */
case 24:
var->red.offset = 0;
if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
/* RGB:888 mode */
var->red.offset = 16;
var->blue.offset = 0;
} else {
/* BGR:888 mode */
var->red.offset = 0;
var->blue.offset = 16;
}
var->green.offset = 8;
var->blue.offset = 16;
var->red.length = var->green.length = var->blue.length = 8;
break;
default:
@ -697,6 +713,7 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
sinfo->guard_time = pdata_sinfo->guard_time;
sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
} else {
dev_err(dev, "cannot get default configuration\n");
goto free_info;

10
include/video/atmel_lcdc.h
View file

@ -22,6 +22,15 @@
#ifndef __ATMEL_LCDC_H__
#define __ATMEL_LCDC_H__
/* Way LCD wires are connected to the chip:
* Some Atmel chips use BGR color mode (instead of standard RGB)
* A swapped wiring onboard can bring to RGB mode.
*/
#define ATMEL_LCDC_WIRING_BGR 0
#define ATMEL_LCDC_WIRING_RGB 1
/* LCD Controller info data structure, stored in device platform_data */
struct atmel_lcdfb_info {
spinlock_t lock;
@ -42,6 +51,7 @@ struct atmel_lcdfb_info {
u8 saved_lcdcon;
u8 default_bpp;
u8 lcd_wiring_mode;
unsigned int default_lcdcon2;
unsigned int default_dmacon;
void (*atmel_lcdfb_power_control)(int on);