Detect the firmware framebuffer's parent device from the global
screen_info state and set up the framebuffer's device accordingly.
Remove the equivalent functionality from efifb. Other drivers for
firmware framebuffers, such as simpledrm or vesafb, now add these
new features.
Patches 1 and 2 provide a set of helper functions to avoid parsing
the screen_info values manually. Decoding screen_info is fragile and
many drivers get it wrong. We should later adopt these helpers in
existing drivers, such as efifb, vesafb, as well.
Patches 3 and 4 set the firmware framebuffer's parent device. There
is code in efifb to do something similar for power management. That
is now obsolete and being cleaned up. Setting the parent device makes
Linux track the power management correctly.
Patches 5 and 6 track the parent device's enable state. We don't
create framebuffer devices if the underlying hardware device has been
disabled. Remove the functionality from efifb.
Patches 7 and 8 track the parent device's PCI BAR location. It can
happen on aarch64 that the firmware framebuffer moves its location
during the kernel's boot. We now fix up the screen_info state to
point to the correct location. Again remove such functionality from
efifb.
v3:
* filter PCI device list with pci_get_base_class() (Sui)
* fix error handling for screen_info_pci_dev() (Sui)
* fix build for CONFIG_SYSFB_SIMPLEFB=n (Sui)
* small cleanups
v2:
* small refactorings throughout the patchset
Thomas Zimmermann (8):
video: Add helpers for decoding screen_info
video: Provide screen_info_get_pci_dev() to find screen_info's PCI
device
firmware/sysfb: Set firmware-framebuffer parent device
fbdev/efifb: Remove PM for parent device
firmware/sysfb: Create firmware device only for enabled PCI devices
fbdev/efifb: Do not track parent device status
firmware/sysfb: Update screen_info for relocated EFI framebuffers
fbdev/efifb: Remove framebuffer relocation tracking
drivers/firmware/Kconfig | 1 +
drivers/firmware/sysfb.c | 51 +++++++++-
drivers/firmware/sysfb_simplefb.c | 5 +-
drivers/video/Kconfig | 4 +
drivers/video/Makefile | 4 +
drivers/video/fbdev/efifb.c | 97 +-----------------
drivers/video/screen_info_generic.c | 146 ++++++++++++++++++++++++++++
drivers/video/screen_info_pci.c | 136 ++++++++++++++++++++++++++
include/linux/screen_info.h | 126 ++++++++++++++++++++++++
include/linux/sysfb.h | 6 +-
10 files changed, 480 insertions(+), 96 deletions(-)
create mode 100644 drivers/video/screen_info_generic.c
create mode 100644 drivers/video/screen_info_pci.c
--
2.43.0
