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vt8623fb: new framebuffer driver for VIA VT8623
This patch adds fbdev driver for graphics core in VIA VT8623 [[email protected]: build fixes] Signed-off-by: Ondrej Zajicek <[email protected]> Signed-off-by: Antonino Daplas <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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Ondrej Zajicek
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Linus Torvalds
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May 9, 2007
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vt8623fb - fbdev driver for graphics core in VIA VT8623 chipset | ||
=============================================================== | ||
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Supported Hardware | ||
================== | ||
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VIA VT8623 [CLE266] chipset and its graphics core | ||
(known as CastleRock or Unichrome) | ||
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I tested vt8623fb on VIA EPIA ML-6000 | ||
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Supported Features | ||
================== | ||
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* 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 | ||
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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). | ||
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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). | ||
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Suspend/resume works on systems that initialize video card during resume and | ||
if device is active (for example used by fbcon). | ||
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Missing Features | ||
================ | ||
(alias TODO list) | ||
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* 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) | ||
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Known bugs | ||
========== | ||
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* cursor disable in text mode doesn't work | ||
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-- | ||
Ondrej Zajicek <[email protected]> |
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