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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
commit fd0858017e
2 changed files with 32 additions and 5 deletions
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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);