[PATCH V12 00/14] Krait clocks + Krait CPUfreq

From: Craig <hidden>
Date: 2018-09-20 14:27:31
Also in: linux-arm-msm, linux-clk, linux-devicetree, linux-pm, lkml


On 20 September 2018 14:01:57 BST, Sricharan R [off-list ref] wrote:


On 9/20/2018 1:54 AM, Craig wrote:

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Yup, this patch seems to have fixed the higher frequencies from the

quick test I did.

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 Thanks !!. Can i take that as Craig Tatlor [off-list ref] ?

Sure, no problem

Regards,
Sricharan

      tested-by:

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On 7 September 2018 15:28:53 BST, Craig Tatlor [off-list ref]

wrote:

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On 7 September 2018 10:57:34 BST, Sricharan R
[off-list ref] wrote:

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Hi Craig,

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[v12]
  * Added my signed-off that was missing in some patches.
  * Added Bjorn's acked that i missed earlier.

  Can you give this a try on your 8974 device and check if the
  pvs version reporting, scaling for higher frequencies are fine ?
  Sorry, i could not get hold of a 8974 device. So in-case if you

still

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  have the issues with higher frequencies, can you give a quick

debug

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  and report. That would be of great help.

  Ping on this ..

Hi, didn't see your last message,

Will have a try on mine in the weekend and report back.

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Regards,
Sricharan

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Regards,
 Sricharan

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[v11]
  * Dropped patch 13 and 14 from v10 and
    merged the qcom-cpufreq-krait driver to the existing

qcom-cpufreq-kryo.c

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  * Rebased on top of clk-next
  * Fixed a bug while populating the pvs version for krait.

[v10]
  * Addressed Stephen's comments to add clocks bindings

properties

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    to the newly introduced nodes.
  * Added a change to include opp-supported-hw to qcom-cpufreq.c
  * Rebased on top of clk-next
  * Although there were minor changes to bindings and the driver
    retained the acked-by tags from Rob and Viresh respectively.

quoted

[v9]
  * Fixed a rebase issue in Makefile and added Tag from Robh.

[v8]
  * Fixed a bug in path#14 pointed out by Viresh and also added

tags.

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    No change in any other patch.

[v7]
  * Fixed comments from Viresh for cleaning up the error handling
    in qcom-cpufreq.c. Also changed the init function to lateinit
    call. This is required because nvmem which gets initialised

with

quoted

    module_init needs to go first.
  * Fixed Rob's comments for bindings documentation
  * Fixed kbuild build issue in clk-lpc32xx.c
  * Rebased on top of clk-next

[v6]
  * Adrressed comments from Viresh for patch #14 in v5 [5]
  * Introduced a new binding operating-points-v2-krait-cpu
    as per discussion with Rob
  * Added Review tags

[v5]
  * Addressed comments from Rob for bindings
  * Addressed comments from Viresh to use

dev_pm_opp_set_prop_name,

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accordingly

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    dropped patch #12 and corrected patch #11 from previous patch

set in [4]

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  * Converted to use #spdx tags for newly introduced files

Mostly a resend of the v3 posted by Stephen quite some time back

[1]

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except for few changes.
  Based on reading some feedback from list,
  * Dropped the patch "clk: Add safe switch hook" from v3 [2].
    Now this is taken care by patch#10 in this series only for

Krait.

quoted

  * Dropped the path "clk: Avoid sending high rates to downstream
		      clocks during set_rate" from v3 [3].
  * Rebased on top of clk-next.
  * Dropped the DT update from the series. Will send separately
  * Now with cpufreq-dt+opp supporting voltage scaling,

registering

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the

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    krait cpu supplies in DT should be sufficient. But one issue

is,

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    the qcom-cpufreq drivers reads the efuse and based on that

registers

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    the opp data and then registers the cpufreq-dt device. So

when

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    cpufreq-dt driver probes and registers the regulator to the

OPP

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framework,

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    it expects that the opp data for the device should not be

registered before

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    the regulator. Will send a RFC patch removing that check, to

find out the

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    right way of doing it.

These patches provide cpufreq scaling on devices with Krait CPUs.
In Krait CPU designs there's one PLL and two muxes per CPU,

allowing

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us to switch CPU frequencies independently.

				 secondary
	 +-----+                    +
	 | QSB |-------+------------|\
	 +-----+       |            | |-+
		       |    +-------|/  |
		       |    |       +   |
	 +-----+       |    |           |
	 | PLL |----+-------+           |   primary
	 +-----+    |  |                |     +
		    |  |                +-----|\       +------+
	 +-------+  |  |                      | \      |      |
	 | HFPLL |----------+-----------------|  |-----| CPU0 |
	 +-------+  |  |    |                 |  |     |      |
		    |  |    | +-----+         | /      +------+
		    |  |    +-| / 2 |---------|/
		    |  |      +-----+         +
		    |  |         secondary
		    |  |            +
		    |  +------------|\
		    |               | |-+
		    +---------------|/  |   primary
				    +   |     +
					+-----|\       +------+
	 +-------+                            | \      |      |
	 | HFPLL |----------------------------|  |-----| CPU1 |
	 +-------+          |                 |  |     |      |
			    | +-----+         | /      +------+
			    +-| / 2 |---------|/
			      +-----+         +

To support this in the common clock framework we model the muxes,
dividers, and PLLs as different clocks. CPUfreq only interacts
with the primary mux (farthest right in the diagram). When

CPUfreq

quoted

sets a rate, the mux code finds the best parent that can provide

the

quoted

rate.

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Due to the design, QSB and the top PLL are always a fixed rate

and

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thus

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only support one frequency each. These sources provide the lowest
frequencies for the CPUs. The HFPLLs are where we can make the

CPU

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go

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faster (GHz range). Sometimes we need to run the HFPLL twice as
fast and divide it by two to get a particular frequency.

When switching rates we can't leave the CPU clocked by the HFPLL

because

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we need to turn off the output of the PLL when changing its

frequency.

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This means we have to switch over to the secondary mux and use

one

quoted

quoted
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of the
quoted
quoted
fixed sources. This is why we need something like the safe parent
patch.
quoted
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[1]

http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/332607.html

quoted

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quoted
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[2]

http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/332615.html

quoted

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[3]

http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/332608.html

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[4] https://lwn.net/Articles/740994/ 
[5] https://lkml.org/lkml/2017/12/19/537


Sricharan R (3):
  clk: qcom: Add safe switch hook for krait mux clocks
  cpufreq: qcom: Re-organise kryo cpufreq to use it for other

nvmem

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    based qcom socs
  cpufreq: qcom: Add support for krait based socs

Stephen Boyd (11):
  ARM: Add Krait L2 register accessor functions
  clk: qcom: Add support for High-Frequency PLLs (HFPLLs)
  clk: qcom: Add HFPLL driver
  dt-bindings: clock: Document qcom,hfpll
  clk: qcom: Add MSM8960/APQ8064's HFPLLs
  clk: qcom: Add IPQ806X's HFPLLs
  clk: qcom: Add support for Krait clocks
  clk: qcom: Add KPSS ACC/GCC driver
  dt-bindings: arm: Document qcom,kpss-gcc
  clk: qcom: Add Krait clock controller driver
  dt-bindings: clock: Document qcom,krait-cc

 .../devicetree/bindings/arm/msm/qcom,kpss-acc.txt  |  19 +
 .../devicetree/bindings/arm/msm/qcom,kpss-gcc.txt  |  44 +++
 .../devicetree/bindings/clock/qcom,hfpll.txt       |  60 ++++
 .../devicetree/bindings/clock/qcom,krait-cc.txt    |  34 ++
 .../{kryo-cpufreq.txt => qcom-nvmem-cpufreq.txt}   |   7 +-
 arch/arm/common/Kconfig                            |   3 +
 arch/arm/common/Makefile                           |   1 +
 arch/arm/common/krait-l2-accessors.c               |  48 +++
 arch/arm/include/asm/krait-l2-accessors.h          |   9 +
 drivers/clk/qcom/Kconfig                           |  28 ++
 drivers/clk/qcom/Makefile                          |   5 +
 drivers/clk/qcom/clk-hfpll.c                       | 244

+++++++++++++

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 drivers/clk/qcom/clk-hfpll.h                       |  44 +++
 drivers/clk/qcom/clk-krait.c                       | 126 +++++++
 drivers/clk/qcom/clk-krait.h                       |  40 +++
 drivers/clk/qcom/gcc-ipq806x.c                     |  82 +++++
 drivers/clk/qcom/gcc-msm8960.c                     | 172

+++++++++

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 drivers/clk/qcom/hfpll.c                           |  96 +++++
 drivers/clk/qcom/kpss-xcc.c                        |  87 +++++
 drivers/clk/qcom/krait-cc.c                        | 397

+++++++++++++++++++++

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 drivers/cpufreq/Kconfig.arm                        |   6 +-
 drivers/cpufreq/Makefile                           |   2 +-
 drivers/cpufreq/cpufreq-dt-platdev.c               |   5 +
 drivers/cpufreq/qcom-cpufreq-kryo.c                | 232

------------

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 drivers/cpufreq/qcom-cpufreq-nvmem.c               | 387

++++++++++++++++++++

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 include/dt-bindings/clock/qcom,gcc-msm8960.h       |   2 +
 26 files changed, 1941 insertions(+), 239 deletions(-)
 create mode 100644

Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt

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 create mode 100644

Documentation/devicetree/bindings/clock/qcom,hfpll.txt

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 create mode 100644

Documentation/devicetree/bindings/clock/qcom,krait-cc.txt

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 rename Documentation/devicetree/bindings/opp/{kryo-cpufreq.txt

=>

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qcom-nvmem-cpufreq.txt} (98%)

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 create mode 100644 arch/arm/common/krait-l2-accessors.c
 create mode 100644 arch/arm/include/asm/krait-l2-accessors.h
 create mode 100644 drivers/clk/qcom/clk-hfpll.c
 create mode 100644 drivers/clk/qcom/clk-hfpll.h
 create mode 100644 drivers/clk/qcom/clk-krait.c
 create mode 100644 drivers/clk/qcom/clk-krait.h
 create mode 100644 drivers/clk/qcom/hfpll.c
 create mode 100644 drivers/clk/qcom/kpss-xcc.c
 create mode 100644 drivers/clk/qcom/krait-cc.c
 delete mode 100644 drivers/cpufreq/qcom-cpufreq-kryo.c
 create mode 100644 drivers/cpufreq/qcom-cpufreq-nvmem.c

-- 
Please, Don't Panic

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