mirror of
https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10.git
synced 2026-09-09 00:07:04 +08:00
Jocelyn Falempe
2e7db0bd07
JIRA: https://issues.redhat.com/browse/RHEL-135265 commit 7399c13f619f33dc8bdce838f3c83e88a18765ee Author: Thomas Zimmermann <tzimmermann@suse.de> Date: Mon Jul 14 17:13:09 2025 +0200 drm/vesadrm: Support DRM_FORMAT_C8 Add support for DRM_FORMAT_C8 to vesadrm. The new pixel-format description PIXEL_FORMAT_C8 describes the layout. Vesadrm's helpers vesadrm_fill_palette_lut() and vesadrm_load_palette_lut() set the hardware palette according to the CRTC's output format. The driver emulates XRGB8888 by converting the source buffer to RGB332 and using the resulting 256 colors as index into the hardware palette. The hardware palette converts back to RGB during scanout. This has no overhead compared to other format conversion, but allows common userspace, such as Wayland compositors, to operate on the display. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://lore.kernel.org/r/20250714151513.309475-10-tzimmermann@suse.de Conflicts: - drivers/gpu/drm/sysfb/vesadrm.c: 4 hunks omitted (cherry picked from commit 7399c13f619f33dc8bdce838f3c83e88a18765ee) Assisted-by: Patchpal Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>