[PATCH 0/8] firmware: sysfb: Consolidate config/code wrt. sysfb_primary_screen

Thomas Zimmermann
2026-04-02T09:23:23Z

The global state sysfb_primary_screen holds information about the
framebuffer provided by EFI/BIOS systems. It is part of the sysfb
module, but used in several places without direct connection to
sysfb. Fix this by making users of sysfb_primary_screen depend on
CONFIG_SYSFB. Fix a few issues in the process.

Patches 1 and 2 fix general errors in the Kconfig rules. In any case,
these patches should be considered even without the rest of the series.

Patch 3 makes CONFIG_SYSFB a user-controlled option, which gives users
more control over the configuration.

Patches 4 to 6 slightly refactor the sysfb code. The PCI helpers are
now in a separate source file. Support for relocating the PCI framebuffer
is now located in sysfb, where it belongs.

Patches 7 and 8 make earlycon and the firmware EDID depend on sysfb. Both
rely on sysfb_primary_display to work correctly.

Smoke-tested with bochs on qemu. Built with/without CONFIG_SYSFB enabled.

Note: vgaarb still guards sysfb_primary_display with CONFIG_X86 instead
of CONFIG_SYSFB. That works reliably and is left in place, as a change to
guard with SYSFB_SYSFB might affect non-x86 systems in unknown ways.

Thomas Zimmermann (8):
hv: Select CONFIG_SYSFB only for CONFIG_HYPERV_VMBUS
firmware: efi: Never declare sysfb_primary_display on x86
firmware: sysfb: Make CONFIG_SYSFB a user-selectable option
firmware: sysfb: Split sysfb.c into sysfb_primary.c and sysfb_pci.c
firmware: sysfb: Implement screen_info relocation for primary display
firmware: sysfb: Avoid forward-declaring sysfb_parent_dev()
firmware: efi: Make CONFIG_EFI_EARLYCON depend on CONFIG_SYSFB; clean
up
firmware: sysfb: Move CONFIG_FIRMWARE_EDID to firmware options

arch/arm64/kernel/image-vars.h | 2 +-
arch/loongarch/configs/loongson32_defconfig | 1 +
arch/loongarch/configs/loongson64_defconfig | 1 +
arch/loongarch/kernel/efi.c | 4 +-
arch/loongarch/kernel/image-vars.h | 2 +-
arch/riscv/kernel/image-vars.h | 2 +-
drivers/firmware/Kconfig | 38 ++++-
drivers/firmware/Makefile | 7 +-
drivers/firmware/efi/Kconfig | 3 +-
drivers/firmware/efi/efi-init.c | 6 +-
drivers/firmware/efi/libstub/efi-stub-entry.c | 4 +-
drivers/firmware/sysfb.h | 24 ++++
drivers/firmware/sysfb_pci.c | 132 ++++++++++++++++++
drivers/firmware/{sysfb.c => sysfb_primary.c} | 70 ++++------
drivers/gpu/drm/sysfb/Kconfig | 4 +-
drivers/hv/Kconfig | 2 +-
drivers/video/Kconfig | 19 ---
drivers/video/fbdev/Kconfig | 5 +-
drivers/video/screen_info_pci.c | 110 ---------------
include/linux/screen_info.h | 3 -
20 files changed, 241 insertions(+), 198 deletions(-)
create mode 100644 drivers/firmware/sysfb.h
create mode 100644 drivers/firmware/sysfb_pci.c
rename drivers/firmware/{sysfb.c => sysfb_primary.c} (90%)

base-commit: 5d36e6d54e963f0c1137aaf2249d2baa781f08c2
--
2.53.0