On 2021-01-13 11:44, Nicolas Saenz Julienne wrote:
On Thu, 2020-12-17 at 19:16 -0800, Saravana Kannan wrote:
As discussed in LPC 2020, cyclic dependencies in firmware that
couldn't
be broken using logic was one of the last remaining reasons
fw_devlink=on couldn't be set by default.
This series changes fw_devlink so that when a cyclic dependency is
found
in firmware, the links between those devices fallback to permissive
mode
behavior. This way, the rest of the system still benefits from
fw_devlink, but the ambiguous cases fallback to permissive mode.
Setting fw_devlink=on by default brings a bunch of benefits
(currently,
only for systems with device tree firmware):
* Significantly cuts down deferred probes.
* Device probe is effectively attempted in graph order.
* Makes it much easier to load drivers as modules without having to
worry about functional dependencies between modules (depmod is still
needed for symbol dependencies).
FWIW I don't see any issues with this on Raspberry Pi 4 :).
Keep bragging! ;-)
M.
--
Jazz is not dead. It just smells funny...
