From fd0858017eb67aa0d41dd4e8499ca6a7bfb63941 Mon Sep 17 00:00:00 2001 From: Nicolas Ferre Date: Mon, 28 Apr 2008 02:15:21 -0700 Subject: 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). Signed-off-by: Nicolas Ferre Cc: David Brownell Cc: Hans-Christian Egtvedt Cc: Haavard Skinnemoen Cc: Andrew Victor Cc: "Antonino A. Daplas" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/atmel_lcdfb.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) (limited to 'drivers/video') diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c index 6fcf76c..5a31a7a 100644 --- a/drivers/video/atmel_lcdfb.c +++ b/drivers/video/atmel_lcdfb.c @@ -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; -- cgit v1.1