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@linux-m68k.org
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(-)