]> git.baikalelectronics.ru Git - kernel.git/commit
powerpc/powernv/idle: Round up latency and residency values
authorVaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Wed, 23 Aug 2017 18:58:41 +0000 (00:28 +0530)
committerMichael Ellerman <mpe@ellerman.id.au>
Sun, 12 Nov 2017 21:00:29 +0000 (08:00 +1100)
commit8d4e10e9ed9450e18fbbf6a8872be0eac9fd4999
treeb253e20bfac899bb3b9bfec1ab62e473f7978fdc
parentacdfe93101d0f5b968d1bd7ab125517bf7444047
powerpc/powernv/idle: Round up latency and residency values

On PowerNV platforms, firmware provides exit latency and
target residency for each of the idle states in nano
seconds.  Cpuidle framework expects the values in micro
seconds.  Round up to nearest micro seconds to avoid errors
in cases where the values are defined as fractional micro
seconds.

Default idle state of 'snooze' has exit latency of zero.  If
other states have fractional micro second exit latency, they
would get rounded down to zero micro second and make cpuidle
framework choose deeper idle state when snooze loop is the
right choice.

Reported-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
drivers/cpuidle/cpuidle-powernv.c