Commit 558b7bd8 authored by Ondrej Zajicek's avatar Ondrej Zajicek Committed by Linus Torvalds
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vt8623fb: new framebuffer driver for VIA VT8623

This patch adds fbdev driver for graphics core in VIA VT8623

[ build fixes]
Signed-off-by: default avatarOndrej Zajicek <>
Signed-off-by: default avatarAntonino Daplas <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent c3c117f0
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 <>
......@@ -1348,6 +1348,20 @@ config FB_VOODOO1
Please read the <file:Documentation/fb/README-sstfb.txt> for supported
options and other important info support.
config FB_VT8623
tristate "VIA VT8623 support"
depends on FB && PCI
Driver for CastleRock integrated graphics core in the
VIA VT8623 [Apollo CLE266] chipset.
config FB_CYBLA
tristate "Cyberblade/i1 support"
depends on FB && PCI && X86_32 && !64BIT
......@@ -54,6 +54,7 @@ obj-$(CONFIG_FB_VALKYRIE) += valkyriefb.o
obj-$(CONFIG_FB_CT65550) += chipsfb.o
obj-$(CONFIG_FB_IMSTT) += imsttfb.o
obj-$(CONFIG_FB_FM2) += fm2fb.o
obj-$(CONFIG_FB_VT8623) += vt8623fb.o
obj-$(CONFIG_FB_CYBLA) += cyblafb.o
obj-$(CONFIG_FB_TRIDENT) += tridentfb.o
obj-$(CONFIG_FB_LE80578) += vermilion/
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