PowerPC's Open Firmware offers a simple display buffer for graphics output. Add ofdrm, a DRM driver for the device. As with the existing simpledrm driver, the graphics hardware is pre-initialized by the firmware. The driver only provides blitting, no actual DRM modesetting is possible. Patch 1 adds ofdrm, which has again been significantly reworked. The FWFB library has been removed infavor of various functions in existing DRM helper libraries. Ofdrm now supports damage iterators and synchronization for imported GEM BOs. Patches 2 to 4 add support for color management. The code has been taken from fbdev's offb. I have no hardware available for testing the functionality. Qemu's stdvga apparently does not support gamma tables in RGB modes. I verified that the color management code is executed by running Gnome's night-mode settings, but the display's color tone does not change. Patch 5, which is new in version 4 of this patchset, adds support for big-endian scanout buffers. It works at least with qemu's ppc64 emulation. Fbdev emulation and pixman rendering works. GL rendering produces incorrect colors. Tested by running fbdev emulation, Wayland Gnome, and Weston on qemu's ppc64le and ppc64 emulation. Thomas Zimmermann (5): drm/ofdrm: Add ofdrm for Open Firmware framebuffers drm/ofdrm: Add CRTC state drm/ofdrm: Add per-model device function drm/ofdrm: Support color management drm/ofdrm: Support big-endian scanout buffers MAINTAINERS | 1 + drivers/gpu/drm/drm_format_helper.c | 10 + drivers/gpu/drm/tiny/Kconfig | 13 + drivers/gpu/drm/tiny/Makefile | 1 + drivers/gpu/drm/tiny/ofdrm.c | 1424 +++++++++++++++++++++++++++ drivers/video/fbdev/Kconfig | 1 + 6 files changed, 1450 insertions(+) create mode 100644 drivers/gpu/drm/tiny/ofdrm.c -- 2.37.3
