This actually helps save a bit of power (at least for sysmgr_3) since
the "always-on" clk_base is slower.
The SoC needs more time to compute frames, but the same number of
cycles so that doesn't change the power on clk_sys itself really.
This will also be helpful for upcoming commits where we switch to
a Vex that has better IPC but doesn't easily meet 24 MHz constraint.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Before it was only sensitive to rising edge. But for the "start" we
actually want to force it on if active to avoid race condition in the
software where:
- CPU clears the condition of the wakeup
- New wake up event happens right after it
- CPU asks for shutdown
- And then no rising edge happens because wakeup is already high
For shutdown it's good that it's rising edge dependent since the
OFF command signal _might_ stay high if the system clock shuts down
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Sylvain Munaut