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| author | Michael Schmitz <schmitzmic@gmail.com> | 2022-02-16 10:26:25 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-08 15:23:00 +0300 |
| commit | 677a5f6c81b5eae856757f5b625a20f130963793 (patch) | |
| tree | 2037af9449ea749889c113ea071faa836d8b435b /drivers/video | |
| parent | 46cdbff26c88fd75dccbf28df1d07cbe18007eac (diff) | |
| download | linux-677a5f6c81b5eae856757f5b625a20f130963793.tar.xz | |
video: fbdev: atari: Atari 2 bpp (STe) palette bugfix
commit c8be5edbd36ceed2ff3d6b8f8e40643c3f396ea3 upstream.
The code to set the shifter STe palette registers has a long
standing operator precedence bug, manifesting as colors set
on a 2 bits per pixel frame buffer coming up with a distinctive
blue tint.
Add parentheses around the calculation of the per-color palette
data before shifting those into their respective bit field position.
This bug goes back a long way (2.4 days at the very least) so there
won't be a Fixes: tag.
Tested on ARAnyM as well on Falcon030 hardware.
Cc: stable@vger.kernel.org
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/all/CAMuHMdU3ievhXxKR_xi_v3aumnYW7UNUO6qMdhgfyWTyVSsCkQ@mail.gmail.com
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbdev/atafb.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/video/fbdev/atafb.c b/drivers/video/fbdev/atafb.c index e3812a8ff55a..29e650ecfceb 100644 --- a/drivers/video/fbdev/atafb.c +++ b/drivers/video/fbdev/atafb.c @@ -1683,9 +1683,9 @@ static int falcon_setcolreg(unsigned int regno, unsigned int red, ((blue & 0xfc00) >> 8)); if (regno < 16) { shifter_tt.color_reg[regno] = - (((red & 0xe000) >> 13) | ((red & 0x1000) >> 12) << 8) | - (((green & 0xe000) >> 13) | ((green & 0x1000) >> 12) << 4) | - ((blue & 0xe000) >> 13) | ((blue & 0x1000) >> 12); + ((((red & 0xe000) >> 13) | ((red & 0x1000) >> 12)) << 8) | + ((((green & 0xe000) >> 13) | ((green & 0x1000) >> 12)) << 4) | + ((blue & 0xe000) >> 13) | ((blue & 0x1000) >> 12); ((u32 *)info->pseudo_palette)[regno] = ((red & 0xf800) | ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11)); @@ -1971,9 +1971,9 @@ static int stste_setcolreg(unsigned int regno, unsigned int red, green >>= 12; if (ATARIHW_PRESENT(EXTD_SHIFTER)) shifter_tt.color_reg[regno] = - (((red & 0xe) >> 1) | ((red & 1) << 3) << 8) | - (((green & 0xe) >> 1) | ((green & 1) << 3) << 4) | - ((blue & 0xe) >> 1) | ((blue & 1) << 3); + ((((red & 0xe) >> 1) | ((red & 1) << 3)) << 8) | + ((((green & 0xe) >> 1) | ((green & 1) << 3)) << 4) | + ((blue & 0xe) >> 1) | ((blue & 1) << 3); else shifter_tt.color_reg[regno] = ((red & 0xe) << 7) | |