Hi all,
When starting to use modetest, I was a bit surprised to discover the
default XR24 format wasn't displayed correctly on my work-in-progress
Atari DRM driver, which runs on a big-endian system.
This RFC patch series fixes some endianness issues in libdrm.
It has been tested on ARAnyM using a work-in-progress Atari DRM driver,
which can now display the XR24 format by converting XRGB8888 to RGB332.
Overview:
- Patch 1 improves the existing endianness checks in a header file for
the Intel driver,
- Patch 2 fixes the display of 32 bpp patterns on big-endian systems.
Futher endian fixes may be needed. Note that I also have a variant of
patch 2 for 16 bpp, which works with the Atari DRM driver converting
RGB565 to RGB332. But I want to get real 16 bpp working in the Atari
DRM driver first, as that uses a 16-bit big endian format.
And what about 24 bpp?
Please refer to [1] for more information.
Thanks for your comments!
[1] "[PATCH v2 00/10] drm: Add support for low-color frame buffer formats"
https://lore.kernel.org/r/cover.1646683502.git.geert@xxxxxxxxxxxxxx
Geert Uytterhoeven (2):
intel: Improve checks for big-endian
util: Fix 32 bpp patterns on big-endian
intel/uthash.h | 2 +-
tests/util/pattern.c | 30 +++++++++++++++++++++---------
2 files changed, 22 insertions(+), 10 deletions(-)
--
2.25.1
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
