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Message-ID: <47D5450A.40500@atmel.com>
Date: Mon, 10 Mar 2008 15:26:18 +0100
From: Nicolas Ferre <nicolas.ferre@...el.com>
To: linux-fbdev-devel@...ts.sourceforge.net,
Linux Kernel list <linux-kernel@...r.kernel.org>,
"Antonino A. Daplas" <adaplas@...il.com>
CC: ARM Linux Mailing List <linux-arm-kernel@...ts.arm.linux.org.uk>,
Haavard Skinnemoen <hskinnemoen@...el.com>,
Sedji GAOUAOU <sedji.gaouaou@...el.com>,
Patrice VILCHEZ <patrice.vilchez@...el.com>,
Andrew Victor <linux@...im.org.za>
Subject: [PATCH] atmel_lcdfb: wiring BGR to RGB color mode
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).
---
drivers/video/atmel_lcdfb.c | 27 ++++++++++++++++++++++-----
include/video/atmel_lcdc.h | 10 ++++++++++
2 files changed, 32 insertions(+), 5 deletions(-)
--- linux-2.6.x-rc.orig/drivers/video/atmel_lcdfb.c
+++ linux-2.6.x-rc/drivers/video/atmel_lcdfb.c
@@ -338,19 +338,35 @@ static int atmel_lcdfb_check_var(struct
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(stru
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;
--- linux-2.6.x-rc.orig/include/video/atmel_lcdc.h
+++ linux-2.6.x-rc/include/video/atmel_lcdc.h
@@ -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);
--
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