mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-30 16:13:54 +08:00
558b7bd86c
This patch adds fbdev driver for graphics core in VIA VT8623 [adaplas@gmail.com: build fixes] Signed-off-by: Ondrej Zajicek <santiago@crfreenet.org> Signed-off-by: Antonino Daplas <adaplas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
65 lines
1.8 KiB
Plaintext
65 lines
1.8 KiB
Plaintext
|
|
vt8623fb - fbdev driver for graphics core in VIA VT8623 chipset
|
|
===============================================================
|
|
|
|
|
|
Supported Hardware
|
|
==================
|
|
|
|
VIA VT8623 [CLE266] chipset and its graphics core
|
|
(known as CastleRock or Unichrome)
|
|
|
|
I tested vt8623fb on VIA EPIA ML-6000
|
|
|
|
|
|
Supported Features
|
|
==================
|
|
|
|
* 4 bpp pseudocolor modes (with 18bit palette, two variants)
|
|
* 8 bpp pseudocolor mode (with 18bit palette)
|
|
* 16 bpp truecolor mode (RGB 565)
|
|
* 32 bpp truecolor mode (RGB 888)
|
|
* text mode (activated by bpp = 0)
|
|
* doublescan mode variant (not available in text mode)
|
|
* panning in both directions
|
|
* suspend/resume support
|
|
* DPMS support
|
|
|
|
Text mode is supported even in higher resolutions, but there is limitation to
|
|
lower pixclocks (maximum about 100 MHz). This limitation is not enforced by
|
|
driver. Text mode supports 8bit wide fonts only (hardware limitation) and
|
|
16bit tall fonts (driver limitation).
|
|
|
|
There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with
|
|
packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode
|
|
with interleaved planes (1 byte interleave), MSB first. Both modes support
|
|
8bit wide fonts only (driver limitation).
|
|
|
|
Suspend/resume works on systems that initialize video card during resume and
|
|
if device is active (for example used by fbcon).
|
|
|
|
|
|
Missing Features
|
|
================
|
|
(alias TODO list)
|
|
|
|
* secondary (not initialized by BIOS) device support
|
|
* MMIO support
|
|
* interlaced mode variant
|
|
* support for fontwidths != 8 in 4 bpp modes
|
|
* support for fontheight != 16 in text mode
|
|
* hardware cursor
|
|
* video overlay support
|
|
* vsync synchronization
|
|
* acceleration support (8514-like 2D, busmaster transfers)
|
|
|
|
|
|
Known bugs
|
|
==========
|
|
|
|
* cursor disable in text mode doesn't work
|
|
|
|
|
|
--
|
|
Ondrej Zajicek <santiago@crfreenet.org>
|