linux-kernel - Re: [PATCH] offb: Fix little-endian support

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Message-ID: <1402904135.7661.34.camel@pasglop>
Date:	Mon, 16 Jun 2014 17:35:35 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Tomi Valkeinen <tomi.valkeinen@...com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Cedric Le Goater <clg@...ibm.com>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] offb: Fix little-endian support

On Wed, 2014-05-14 at 15:21 +0200, Takashi Iwai wrote:
>         case 16:                /* RGB 565 */
>                 var->bits_per_pixel = 16;
> -               var->red.offset = 11;
> +               if (fb_be_math(info)) {
> +                       var->red.offset = 11;
> +                       var->green.offset = 5;
> +                       var->blue.offset = 0;
> +               } else {
> +                       var->red.offset = 0;
> +                       var->green.offset = 5;
> +                       var->blue.offset = 11;
> +               }
>                 var->red.length = 5;
> -               var->green.offset = 5;
>                 var->green.length = 6;
> -               var->blue.offset = 0;
>                 var->blue.length = 5;
>                 var->transp.offset = 0;
>                 var->transp.length = 0;
>                 break;

I somewhat doubt that this (and 5:5:5) actually work, do they ? the
green gets split into two separate fields, which we can't express
properly here...

Cheers,
Ben.


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