Re: [PATCH v1] video/fbdev: Atari 2 bpp (STe) palette bugfix

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On Wed, Feb 16, 2022 at 8:26 AM Michael Schmitz <schmitzmic@xxxxxxxxx> wrote:
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@xxxxxxxxxxxxxxx
Reported-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/CAMuHMdU3ievhXxKR_xi_v3aumnYW7UNUO6qMdhgfyWTyVSsCkQ@xxxxxxxxxxxxxx
Tested-by: Michael Schmitz <schmitzmic@xxxxxxxxx>
Signed-off-by: Michael Schmitz <schmitzmic@xxxxxxxxx>

Thanks, fixes the issue for me.
Tested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds



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