[PATCH] xfree86: Add 18bpp support

[Adam Jackson]

On Tue, 2010-09-28 at 06:24 -0500, Pat Kane wrote:
> On Tue, Sep 28, 2010 at 1:15 AM, Kai-Uwe Behrmann <ku.b at gmx.de> wrote:
>  > Just a curious question, Who is using 6+6+6 encoding for what?
> 
> Many handheld devices use TFT LCDs (Thin film transistor liquid crystal display)
> which have 6 bits per RGB.  See <http://en.wikipedia.org/wiki/TFT_LCD>

Yeah, but the GPU typically smashes down from 24bpp to 18bpp in that
case.

However there are some ARM chips (PXA270 comes to mind, I'm sure there
are others) that have x14r6g6b6 framebuffers.  Which is a bit weird
since it saves you exactly no memory bandwidth relative to x8r8g8b8, but
hey it makes the chip cheaper since the GPU doesn't need as many wires
for the pixel path.

- ajax
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