mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 01:31:44 +00:00
249bdbbf0d
This fixes broken fbcon on Virge VX in 24 bpp mode, and contains several other small updates. 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>
83 lines
2.5 KiB
Plaintext
83 lines
2.5 KiB
Plaintext
|
|
s3fb - fbdev driver for S3 Trio/Virge chips
|
|
===========================================
|
|
|
|
|
|
Supported Hardware
|
|
==================
|
|
|
|
S3 Trio32
|
|
S3 Trio64 (and variants V+, UV+, V2/DX, V2/GX)
|
|
S3 Virge (and variants VX, DX, GX and GX2+)
|
|
S3 Plato/PX (completely untested)
|
|
S3 Aurora64V+ (completely untested)
|
|
|
|
- only PCI bus supported
|
|
- only BIOS initialized VGA devices supported
|
|
- probably not working on big endian
|
|
|
|
I tested s3fb on Trio64 (plain, V+ and V2/DX) and Virge (plain, VX, DX),
|
|
all on i386.
|
|
|
|
|
|
Supported Features
|
|
==================
|
|
|
|
* 4 bpp pseudocolor modes (with 18bit palette, two variants)
|
|
* 8 bpp pseudocolor mode (with 18bit palette)
|
|
* 16 bpp truecolor modes (RGB 555 and RGB 565)
|
|
* 24 bpp truecolor mode (RGB 888) on (only on Virge VX)
|
|
* 32 bpp truecolor mode (RGB 888) on (not on Virge VX)
|
|
* text mode (activated by bpp = 0)
|
|
* interlaced mode variant (not available in text mode)
|
|
* 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 usually between 50-60 MHz, depending on specific
|
|
hardware, i get best results from plain S3 Trio32 card - about 75 MHz). This
|
|
limitation is not enforced by driver. Text mode supports 8bit wide fonts only
|
|
(hardware limitation) and 16bit tall fonts (driver limitation). Text mode
|
|
support is broken on S3 Trio64 V2/DX.
|
|
|
|
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
|
|
* big endian support
|
|
* Zorro bus support
|
|
* MMIO support
|
|
* 24 bpp mode support on more cards
|
|
* support for fontwidths != 8 in 4 bpp modes
|
|
* support for fontheight != 16 in text mode
|
|
* composite and external sync (is anyone able to test this?)
|
|
* hardware cursor
|
|
* video overlay support
|
|
* vsync synchronization
|
|
* feature connector support
|
|
* acceleration support (8514-like 2D, Virge 3D, busmaster transfers)
|
|
* better values for some magic registers (performance issues)
|
|
|
|
|
|
Known bugs
|
|
==========
|
|
|
|
* cursor disable in text mode doesn't work
|
|
* text mode broken on S3 Trio64 V2/DX
|
|
|
|
|
|
--
|
|
Ondrej Zajicek <santiago@crfreenet.org>
|