For the sake of overall timing in larger SoCs, remove the early_sel
optimization when there are more than 4 masters.
Also make the ack and stall signals to a particular master depend on
that master's cyc, not on the busy signal, which can depend on any
master's cyc.
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This flips the arbiter muxes on the same cycle as a new request
comes in, thus avoiding a cycle latency.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Consecutive accesses from the same master shouldn't need an IDLE
cycle. Completely remove the IDLE state and switch master when
the bus is idle, but stay on the last selected one between cycles.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Paul Mackerras
Benjamin Herrenschmidt