Hi Jean
Quick question on the tracing in _pwrdm_state_switch().
That section of the code reads:
state = pwrdm_read_pwrst(pwrdm);
...
case PWRDM_STATE_PREV:
prev = pwrdm_read_prev_pwrst(pwrdm);
if (pwrdm->state != prev)
pwrdm->state_counter[prev]++;
if (prev == PWRDM_POWER_RET)
_update_logic_membank_counters(pwrdm);
/*
* If the power domain did not hit the desired state,
* generate a trace event with both the desired and hit states
*/
if (state != prev) {
trace_state = (PWRDM_TRACE_STATES_FLAG |
((state & OMAP_POWERSTATE_MASK) << 8) |
((prev & OMAP_POWERSTATE_MASK) << 0));
trace_power_domain_target(pwrdm->name, trace_state,
smp_processor_id());
}
This code is called after returning from WFI. It appears to compare the
powerdomain's current power state ('state') with the powerdomain's
previous power state ('prev'). But it appears to me that it should
instead compare the powerdomain's intended power state ('pwrdm->state')
with 'prev' ? The rationale is that the PRCM could have brought that
powerdomain up to a higher power state than 'pwrdm->state' during the
wakeup process.
What do you think?
- Paul
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