[PATCH v2 0/2] Enabling PSCI based idle on ARM 32-bit platforms

[Jisheng Zhang]

Dear Lorenzo,

On Mon, 12 Oct 2015 12:17:06 +0100
Lorenzo Pieralisi <lorenzo.pieralisi at arm.com> wrote:

> 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:
> 
> 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 <jszhang at marvell.com>

I also could simple test v3 when it is out.

thanks a lot for these patches!

> 
>  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
>