Request framebuffer memory in simpledrm and simplefb. Do a hot-unplug operation when removing fbdev firmware drivers.
After being unloaded by a hardware driver, simplefb leaves behind the firmware framebuffer's platform device. This prevents other drivers from acquiring the memory as reported at [1].
Patch 1 changes the removal code of remove_conflicting_framebuffers() to remove the underlying device and the rsp memory region.
Patches 2 to 4 update sysfb and its drivers. The sysfb code does no longer mark the framebuffer memory with IORESOURCE_BUSY. Instead, the device drivers acquire the memory when they probe the device.
Patch 5 adds a todo item to acquire memory regions in all DRM drivers.
Tested with simpledrm and simplefb.
[1] https://lore.kernel.org/dri-devel/20220117180359.18114-1-zack@kde.org/
v2: * fix possible NULL deref in simpledrm (Jocelyn) * various style fixes (Javier)
Javier Martinez Canillas (1): drivers/firmware: Don't mark as busy the simple-framebuffer IO resource
Thomas Zimmermann (4): fbdev: Hot-unplug firmware fb devices on forced removal drm/simpledrm: Request memory region in driver fbdev/simplefb: Request memory region in driver drm: Add TODO item for requesting memory regions
Documentation/gpu/todo.rst | 15 +++++++ drivers/firmware/sysfb_simplefb.c | 2 +- drivers/gpu/drm/tiny/simpledrm.c | 22 ++++++++--- drivers/video/fbdev/core/fbmem.c | 29 ++++++++++++-- drivers/video/fbdev/simplefb.c | 65 +++++++++++++++++++++---------- include/linux/fb.h | 1 + 6 files changed, 105 insertions(+), 29 deletions(-)
base-commit: 0bb81b5d6db5f689b67f9d8b35323235c45e890f prerequisite-patch-id: c2b2f08f0eccc9f5df0c0da49fa1d36267deb11d prerequisite-patch-id: c67e5d886a47b7d0266d81100837557fda34cb24 prerequisite-patch-id: 8e52143a6cd7b8fb789e656208f6edde71d0f499