Subject: [PATCH v13 00/10] cpuidle driver for QCOM SoCs: 8064, 8074, 8084

From: [email-masked] (Daniel Lezcano)
Date: Thu, 27 Nov 2014 09:53:03 +0100

Lina,

a night for me has passed and I have in the meantime 3 new versions of 
the patchset obviously done in the hurry and not tested.

Furthermore the change log fails to give the details, "Address review 
comments on spm.c" is just a clue and when I look at the spm.c code all 
the comments where not addressed.

Please, have a look at the "static bool cpuidle_drv_init;", remove it 
and look closely at the idle callbacks error handling in the cpuidle driver.

Thanks

   -- Daniel

On 11/27/2014 06:24 AM, Lina Iyer wrote:
> Dependent patchsets -
>          https://lkml.org/lkml/2014/8/4/767
>          http://www.spinics.net/lists/linux-arm-msm/msg10799.html
>          http://www.spinics.net/lists/linux-arm-msm/msg10795.html
>
> Changes since v12:
> - Minor fixes
> - Added Reviewed-by
>
> Changes since v11:
> - Address review comments on spm.c
> - Commenting style fixes
> - Added Reviewed-by
>
> Changes since v10:
> [ https://www.mail-archive.com/devicetree at vger.kernel.org/msg51880.html ]
> - Address review comments
> - Added Acked-by and Reviewed-by
>
> Changes since v9:
> [ https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg11714.html ]
> - Address review comments on v9
>
> Changes since v8:
> [ https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg11473.html ]
> - Flatten out the file structure - merge pm.c into spm.c after discussions
> - Add a new function to set warm boot address, in scm-boot.c
> - Support for 8064 (New)
> - Tested on 8074, 8084. 8064 was tested with a WIP tree
> - Address review comments from v8
> - Looking into possiblility of  initializing the cpuidle device for a cpu,
> only when the corresponding spm device is probed successfully.
>
> Changes since v7:
> [ https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg11199.html ]
> - Address review comments
> - Tested on 8974 but not 8084
> - WFI renamed to Standby
> - Update commit text with original author and link to the downstream tree
>
> Changes since v6:
> [ https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg11012.html ]
> - SPM device nodes merged with existing SAW DT nodes
> - SPM register information is handled within the driver
> - Clean up from using 'msm' to 'qcom'
>          - Shorten some enumerations as well
> - Review comments from v6 addressed
> - New: Support for 8084 SoC
>          - Not tested. I do not have a board with this SoC, but the SPM
>          configuration should be identical for WFI and SPC
>
> Changes since v5:
> [ https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg10559.html ]
> - Merge spm-devices.c and spm.c into one file and one patch
>          - Simplify implementation of the driver.
>          - Update documentation mapping the DT properties with corresponding
>            SPM register information.
> - Removed scm-boot changes for quad core warmboot, its has been pulled in.
>
> Changes since v4:
> [ https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg10327.html ]
> - Update to the v8 of ARM generic idle states patches
> - Use platform device model for cpuidle-qcom
> - Clean up msm-pm.c to remove unnecessary include files and functions
> - Update commit text and documentation for all idle states
> - Remove scm-boot relocate patch from this series, submitted earlier
> [ https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg10518.html ]
>
> Changes since v3:
> [ https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg10288.html ]
> - Fix CONFIG_QCOM_PM Kconfig as bool
> - More clean ups in spm.c and spm-devices.c
>          - Removed and re-organized data structures to make initialization simple
>          - Remove export of sequence flush functions
>          - Updated commit text
>          - Comments for use of barriers.
> - Rebase on top of 3.17-rc1
>
> Changes since v2:
> [ https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg10148.html ]
> - Prune all the drivers to support basic WFI and power down cpuidle
>    functionality. Remove debug code.
> - Integrate KConfig changes into the drivers' patches.
> - Use Lorenzo's ARM idle-states patches as the basis for reading cpuidle
>    c-states from DT.
>    [ http://marc.info/?l=linux-pm&m=140794514812383&w=2 ]
> - Incorporate review comments
> - Rebase on top of 3.16
>
> Changes since v1/RFC:
> [ https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg10065.html ]
> - Remove hotplug from the patch series. Will submit it separately.
> - Fix SPM drivers per the review comments
> - Modify patch sequence to compile SPM drivers independent of msm-pm, so as to
>    allow wfi() calls to use SPM even without SoC interface driver.
>
> 8074/8084/8064 like any ARM SoC can do architectural clock gating, that helps save
> on power, but not enough of leakage power.  Leakage power of the SoC can be
> further reduced by turning off power to the core. To aid this, every core (cpu
> and L2) is accompanied by a Sub-system Power Manager (SPM), that can be
> configured to indicate the low power mode, the core would be put into and the
> SPM programs the peripheral h/w accordingly to enter low power and turn off the
> power rail to the core.
>
> The idle invocation hierarchy -
>
> CPUIDLE
>          |
>          cpuidle-qcom.c [CPUIdle driver]
>          |
>          ------> spm.c [SPM driver]
>                  |
>                  ------> scm-boot.c [SCM interface layer]
>                          |
> ------------------------|--------------------------
> (EL)                    Secure Monitor Code
>                          |
>                          |
>                          wfi();
> ------------------------|--------------------------
> (HW)                    [CPU] {clock gate}
>                          |
>                          -----> [SPM] {statemachine}
>
>
> The patchset does the following -
>
> - Introduce the SPM driver to control power to the core
> - Add device bindings for 8974, 8084, 8064 CPU SPM devices
> - Add cpuidle driver for QCOM cpus, using ARM generic idle state definitions.
> - Add device bindings for 8974, 8084, 8064 idle-states - WFI and SPC
>
> Thanks,
> Lina
>
>
>
>
> Lina Iyer (10):
>    qcom: scm: Move scm-boot files to drivers/soc/qcom/ and
>      include/soc/qcom
>    qcom: scm: Add SCM warmboot support for quad core SoCs
>    qcom: spm: Add Subsystem Power Manager driver
>    arm: dts: qcom: Add power-controller device node for 8074 Krait CPUs
>    arm: dts: qcom: Add power-controller device node for 8084 Krait CPUs
>    arm: dts: qcom: Update power-controller device node for 8064 Krait
>      CPUs
>    qcom: cpuidle: Add cpuidle driver for QCOM cpus
>    arm: dts: qcom: Add idle states device nodes for 8074
>    arm: dts: qcom: Add idle states device nodes for 8084
>    arm: dts: qcom: Add idle state device nodes for 8064
>
>   .../bindings/arm/msm/qcom,idle-state.txt           |  81 +++++
>   .../devicetree/bindings/arm/msm/qcom,saw2.txt      |  31 +-
>   arch/arm/boot/dts/qcom-apq8064.dtsi                |  36 ++-
>   arch/arm/boot/dts/qcom-apq8084.dtsi                |  46 ++-
>   arch/arm/boot/dts/qcom-msm8974.dtsi                |  46 ++-
>   arch/arm/mach-qcom/Makefile                        |   1 -
>   arch/arm/mach-qcom/platsmp.c                       |   2 +-
>   drivers/cpuidle/Kconfig.arm                        |   7 +
>   drivers/cpuidle/Makefile                           |   1 +
>   drivers/cpuidle/cpuidle-qcom.c                     |  78 +++++
>   drivers/soc/qcom/Kconfig                           |   8 +
>   drivers/soc/qcom/Makefile                          |   3 +-
>   .../arm/mach-qcom => drivers/soc/qcom}/scm-boot.c  |  37 ++-
>   drivers/soc/qcom/spm.c                             | 327 +++++++++++++++++++++
>   include/soc/qcom/pm.h                              |  31 ++
>   .../arm/mach-qcom => include/soc/qcom}/scm-boot.h  |   3 +-
>   16 files changed, 716 insertions(+), 22 deletions(-)
>   create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt
>   create mode 100644 drivers/cpuidle/cpuidle-qcom.c
>   rename {arch/arm/mach-qcom => drivers/soc/qcom}/scm-boot.c (59%)
>   create mode 100644 drivers/soc/qcom/spm.c
>   create mode 100644 include/soc/qcom/pm.h
>   rename {arch/arm/mach-qcom => include/soc/qcom}/scm-boot.h (91%)
>

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