Rob Clark robdclark@gmail.com writes:
From: Rob Clark robdclark@chromium.org
The goal here is to support inheriting a display setup by bootloader, although there may also be some non-display related use-cases.
Rough idea is to add a flag for clks and power domains that might already be enabled when kernel starts, and which should not be disabled at late_initcall if the kernel thinks they are "unused".
If bootloader is enabling display, and kernel is using efifb before real display driver is loaded (potentially from kernel module after userspace starts, in a typical distro kernel), we don't want to kill the clocks and power domains that are used by the display before userspace starts.
Signed-off-by: Rob Clark robdclark@chromium.org
Raspberry Pi is carrying downstream hacks to do similar stuff, and it would be great to see CCF finally support this.