Re: [Linux-fbdev-devel] Supporting various depth

[Romain D. <do...@ir...>]

Geert Uytterhoeven wrote:

> Yes, by looking at the fb_var_screeninfo.{red,green,blue}.length fields. 
> 
> Cfb16 is the memory organization: packed 16 bits per pixel. How a pixel looks
> like internally doesn't matter. So both RGB555 and RGB565 use fbcon-cfb16.c.

How does the user tell the system what he wants, then ? Will fbset
recognize both -depth 15 and -depth 16 and fill the fields properly ?

Right now, pm3fb just disregard whatever is in the length fields
and use RGB8888/RGB565/CI8 for 32/16/8bpp (shame on me). Is there any
requirements on the userland/the kernel about what is acceptable ?
One could require RGB10_10_10_2 or RG232 or RGB4444, what is
the driver supposed to to in case it doesn't support the required
mode : change to a similar mode, do nothing,... ?

TIA

-- 
DOLBEAU Romain               | l'histoire est entierement vraie, puisque
ENS Cachan / Ker Lann        |     je l'ai imaginee d'un bout a l'autre
do...@ir...             |           -- Boris Vian