]> git.baikalelectronics.ru Git - kernel.git/commit
cpuidle/powernv: Add support for POWER ISA v3 idle states
authorShreyas B. Prabhu <shreyas@linux.vnet.ibm.com>
Fri, 8 Jul 2016 06:20:52 +0000 (11:50 +0530)
committerMichael Ellerman <mpe@ellerman.id.au>
Fri, 15 Jul 2016 10:18:42 +0000 (20:18 +1000)
commit66a1e28023a567df7a237de33e93f7f16bc1e6e9
tree296bc85154cee248c06f73aaa00ffcc5dba8251a
parent4fed6d7cb57ec4812ae77401b55f3ce7335bf9d5
cpuidle/powernv: Add support for POWER ISA v3 idle states

POWER ISA v3 defines a new idle processor core mechanism. In summary,
 a) new instruction named stop is added.
 b) new per thread SPR named PSSCR is added which controls the behavior
of stop instruction.

Supported idle states and value to be written to PSSCR register to enter
any idle state is exposed via ibm,cpu-idle-state-names and
ibm,cpu-idle-state-psscr respectively. To enter an idle state,
platform provided power_stop() needs to be invoked with the appropriate
PSSCR value.

This patch adds support for this new mechanism in cpuidle powernv driver.

Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
Cc: linux-pm@vger.kernel.org
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: linuxppc-dev@lists.ozlabs.org
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
drivers/cpuidle/cpuidle-powernv.c