Re: [Linux-fbdev-devel] CRTC scanout buffer types

[Ian Romanick <idr@us.ibm.com>]

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Jon Smirl wrote:
> I'm trying to work out a syntax for the sysfs attribute that will
> control the config. My first idea is to use a alpha/red/blue/green
> syntax. When red is set and blue/green are missing index mode is set.
> When green is set and red/blue are missing gray scale is set.
> 
> Are there chips that can scanout from buffers not packed at a power of two?
> How should I work different color spaces (YCbCr) into this?
> 
> 4bpp Index = /4
> 4bpp greyscale = //4
> 8bpp Index = /8
> 8bpp RGB 332 = /3/3/2
> 8bpp greyscale = //8
> 16bpp aRGB 1555 = 1/5/5/5
> 16bpp RGB 565 = /5/6/5
> 16bpp aRGB 4444 = 4/4/4/4
> 16bpp aIndex 88 = 8/8
> 24bpp RGB 888 = /8/8/8
> 24bpp aRGB 6666 = 6/6/6/6
> 32bpp aRGB 8888 = 8/8/8/8
> 32bpp aRGB 2:10:10:10 = 2/10/10/10

What would be wrong with using a letter, a colon, and a number to
describe the field?  So, instead of 2/10/10/10 you'd have
A:2/R:10/G:10/B:10.  Or A:8/I:8 for aIndex 88.  I'm not familiar with
how sysfs attributes work, so this may be pure nonsense.
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