linux-kernel - Re: [PATCH v2 00/14] Platform Framebuffers and SimpleDRM

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Message-ID: <CANq1E4SZPhzYKUi-VRQon90R8wC9wRncN7ah60CqwwAL-x6EHQ@mail.gmail.com>
Date:	Fri, 5 Jul 2013 15:09:42 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	David Airlie <airlied@...ux.ie>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Peter Jones <pjones@...hat.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	x86@...nel.org, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 00/14] Platform Framebuffers and SimpleDRM

Hi

On Thu, Jul 4, 2013 at 7:48 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 07/04/2013 05:25 AM, David Herrmann wrote:
>>
>>   - What FB formats are common on x86 that we should add to
>> SIMPLEFB_FORMATS?
>>     (other than ARGB/XRGB32)
>
>
> The common pixel formats on x86 are:
>
> - Palettized 4-bit planar (bigendian, i.e. MSB to the left)
> - Palettized 8-bit packed (one byte per pixel)

Unlikely to be supported with DRM. But if users want it, we can always
add a shadow-buffer and advertise it as RGB332 or alike. Otherwise,
they have to use fbdev as usual, which sounds reasonable to me.

> - 16-bit RGB555 (16-bit littleendian words with R=14:10, G=9:5, B=4:0)

DRM_FORMAT_XRGB1555

> - 16-bit RGB565 (16-bit littleendian words with R=15:11, G=10:5, B=4:0)

DRM_FORMAT_RGB565

> - 24-bit RGB888 in littleendian order (first byte in memory is B,
>   second is G, third is R)

DRM_FORMAT_RGB888

> - 32-bit ARGB8888 (first byte in memory is B, second G, third R, fourth
>   unused in the framebuffer proper)

DRM_FORMAT_ARGB8888

> - 32-bit RGB10:10:10 (I *believe* 32-bit littleendian words with
>   R=29:20, G=19:10, B=9:0)

DRM_FORMAT_XRGB2101010

Thanks for the hints, I will add these to patch #5.
David
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