linux-kernel - Re: [PATCH] atmel_lcdfb: wiring BGR to RGB color mode

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Message-ID: <20080313163514.3615a35d@hskinnemo-gx620.norway.atmel.com>
Date:	Thu, 13 Mar 2008 16:35:14 +0100
From:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	linux-fbdev-devel@...ts.sourceforge.net,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	"Antonino A. Daplas" <adaplas@...il.com>,
	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: Re: [PATCH] atmel_lcdfb: wiring BGR to RGB color mode

On Mon, 10 Mar 2008 15:26:18 +0100
Nicolas Ferre <nicolas.ferre@...el.com> wrote:

> 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)

> -		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;
> +		}

Does RGB:565 always imply RGB:888 and vice versa?

If not, I think it would be better with separate flags for the possible
wirings:
   * 18-bit BGR-555.1 / 24-bit BGR-888
   * 16-bit RGB-565
   * 24-bit RGB-888

Or maybe I misunderstand something?

Haavard
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