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fbdev: fix color component field length documentation

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The documentation about the meaning of the color component bitfield
lengths in pseudocolor modes is inconsistent.  Fix it, so that it
indicates the correct interpretation everywhere, i.e.  that 1 << length is
the number of palette entries.

Signed-off-by: Michal Januszewski <[email protected]>
Acked-by: Krzysztof Helt <[email protected]>
Cc: <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michal Januszewski 2009-04-13 14:39:41 -07:00 • committed by Linus Torvalds
commit ebde441177
3 changed files with 18 additions and 9 deletions
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8
drivers/video/skeletonfb.c
View file

@ -308,9 +308,11 @@ static int xxxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
* color depth = SUM(var->{color}.length)
*
* Pseudocolor:
* var->{color}.offset is 0
* var->{color}.length contains width of DAC or the number of unique
* colors available (color depth)
* var->{color}.offset is 0 unless the palette index takes less than
* bits_per_pixel bits and is stored in the upper
* bits of the pixel value
* var->{color}.length is set so that 1 << length is the number of
* available palette entries
* pseudo_palette is not used
* RAMDAC[X] is programmed to (red, green, blue)
* color depth = var->{color}.length

11
drivers/video/vfb.c
View file

@ -318,13 +318,16 @@ static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
* {hardwarespecific} contains width of RAMDAC
* cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset)
* RAMDAC[X] is programmed to (red, green, blue)
*
*
* Pseudocolor:
* uses offset = 0 && length = RAMDAC register width.
* var->{color}.offset is 0
* var->{color}.length contains widht of DAC
* var->{color}.offset is 0 unless the palette index takes less than
* bits_per_pixel bits and is stored in the upper
* bits of the pixel value
* var->{color}.length is set so that 1 << length is the number of available
* palette entries
* cmap is not used
* RAMDAC[X] is programmed to (red, green, blue)
*
* Truecolor:
* does not use DAC. Usually 3 are present.
* var->{color}.offset contains start of bitfield