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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

[adaplas@gmail.com: build fixes]
Signed-off-by: default avatarOndrej Zajicek <santiago@crfreenet.org>
Signed-off-by: default avatarAntonino Daplas <adaplas@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c3c117f0

Documentation/fb/vt8623fb.txt

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	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>

drivers/video/Kconfig

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@@ -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

	select FB_CFB_FILLRECT

	select FB_CFB_COPYAREA

	select FB_CFB_IMAGEBLIT

	select FB_TILEBLITTING

	select FB_SVGALIB

	select VGASTATE

	select FONT_8x16 if FRAMEBUFFER_CONSOLE

	---help---

	  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

drivers/video/Makefile

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@@ -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/

drivers/video/vt8623fb.c

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