Enabling PSCI based idle on ARM 32-bit platforms

Jisheng Zhang linux-arm-kernel linux-pm 1 version Oct 13, 2015 New

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v2 Latest Oct 13, 20150 of 2 patches 0 repliesNew

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Patch	Jisheng Zhang
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Cover letter [PATCH v2 0/2] Enabling PSCI based idle on ARM 32-bit platforms

Dear Lorenzo,

Quoted 40 lines · On Mon, 12 Oct 2015 12:17:06 +0100 Lorenzo Pieralisi…

This patch series is v2 of a previous posting:
http://lists.infradead.org/pipermail/linux-arm-kernel/2015-October/373756.html
v1->v2:
- Refactored patch 1 to remove cpu parameter from cpuidle_ops suspend hook
- Refactored psci_cpu_init_idle to stub out dt parsing function and make it usable on both ARM/ARM64 with no additional changes
- Updated ARM cpuidle_ops to new interfaces
- Fixed PSCI enable method string in ARM cpuidle_ops struct
PSCI firmware provides a kernel API that, through a standard interface, allows to manage power states transitions in a seamless manner for ARM and ARM64 systems.
Current PSCI code that initializes CPUidle states on PSCI based systems lives in arch/arm64 directory but it is not ARM64 specific and can be shared with ARM 32-bit systems so that the generic ARM CPUidle driver can leverage the common PSCI interface.
This patch series moves PSCI CPUidle management code to drivers/firmware directory so that ARM and ARM64 architecture can actually share the code.
It is made up of two patches:
Patch 1 refactors ARM 32-bit generic idle implementation to remove the cpu parameter from the cpuidle_ops suspend hook, in preparation for a common PSCI implementation for ARM/ARM64 PSCI idle.
Patch 2 moves ARM64 PSCI CPUidle functions implementation to drivers/firmware so that it can be shared with ARM 32-bit platforms code. This patch also adds a PSCI entry section on ARM 32-bit systems so that the PSCI CPUidle back-end can be enabled when the enable-method corresponds to PSCI.
Patches apply on top of current patch stack to enable PSCI 1.0:

Quoted 8 lines

git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git tags/firmware/psci-1.0
Tested on Juno board (ARM64), compile tested only on ARM 32-bit systems.
Lorenzo Pieralisi (2):
ARM: cpuidle: remove cpu parameter from the cpuidle_ops suspend hook
ARM64: kernel: PSCI: move PSCI idle management code to
drivers/firmware

I did a simple test, it works ARM 32 PSCI system

So for this series except the qcom changes (I have no qcom platform), feel free to add

Tested-by Jisheng Zhang <[email protected]>

I also could simple test v3 when it is out.

thanks a lot for these patches!

Quoted 11 lines

 arch/arm/include/asm/cpuidle.h |   2 +-
 arch/arm/kernel/cpuidle.c      |   2 +-
 arch/arm64/kernel/psci.c       |  99 +-----------------------------
 drivers/firmware/Makefile      |   2 +-
 drivers/firmware/psci_cpuops.c | 133 +++++++++++++++++++++++++++++++++++++++++
 drivers/soc/qcom/spm.c         |  10 ++--
 include/linux/psci.h           |   3 +
 7 files changed, 146 insertions(+), 105 deletions(-)
 create mode 100644 drivers/firmware/psci_cpuops.c

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