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video: fbdev: atari: Fix ext_setcolreg()

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The red, green, and blue color values are 16-bit, while the external
graphics hardware registers are 8-bit.
Add the missing conversion from 16-bit to 8-bit.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Geert Uytterhoeven 2022-07-11 17:50:28 +02:00 committed by Helge Deller
parent c7ef5e285c
commit 35fa155e83
1 changed files with 4 additions and 0 deletions
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4
drivers/video/fbdev/atafb.c
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@ -2206,6 +2206,10 @@ static int ext_setcolreg(unsigned int regno, unsigned int red,
if (regno > 255)
return 1;
red >>= 8;
green >>= 8;
blue >>= 8;
switch (external_card_type) {
case IS_VGA:
OUTB(0x3c8, regno);