Hi,
please take a look at the patch at [1]. Testing is welcome, if you can.
Best regards
Thomas
[1]
https://lore.kernel.org/dri-devel/[email protected]/
Am 17.10.25 um 20:17 schrieb Timothy Pearson:
On ppc64 systems that use the AST2500 graphics device, such as the Blackbird
POWER9 system, the red and blue channels are inverted when the host is running
in big endian mode. This is due to a ppc64 hardware quirk, which when combined
with a hardware design fault in the AST2500 VGA controller results in a need
to use software-based red-blue channel swapping.
Tested to fix color graphics on Debian sid/ppc64 on a Blackbird system.
Timothy Pearson (2):
PCI: Add CONFIG_PCI_ARCH_ENDIAN_AUTOSWAP
drm/ast: Fix framebuffer color swapping on ppc64 systems
arch/powerpc/Kconfig | 1 +
drivers/gpu/drm/ast/ast_mode.c | 33 +++++++++++++++++++++++++++++++--
drivers/pci/Kconfig | 4 ++++
3 files changed, 36 insertions(+), 2 deletions(-)
--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)
