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Date:   Wed, 19 Sep 2018 21:24:53 +0100
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Subject: Re: [PATCH V12 00/14] Krait clocks + Krait CPUfreq
To:     Sricharan R <sricharan@codeaurora.org>, mark.rutland@arm.com,
        robh@kernel.org, sudeep.holla@arm.com, linux@arm.linux.org.uk,
        rjw@rjwysocki.net, viresh.kumar@linaro.org,
        mturquette@baylibre.com, linux-pm@vger.kernel.org,
        sboyd@codeaurora.org, linux@armlinux.org.uk,
        thierry.escande@linaro.org, linux-kernel@vger.kernel.org,
        david.brown@linaro.org, devicetree@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, andy.gross@linaro.org,
        linux-soc@vger.kernel.org, linux-clk@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, niklas.cassel@linaro.org
From:   Craig <ctatlor97@gmail.com>
Message-ID: <F5A89365-C613-4FE2-AD32-DC0AC6DF380B@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Yup, this patch seems to have fixed the higher frequencies from the quick t=
est I did=2E

On 7 September 2018 15:28:53 BST, Craig Tatlor <ctatlor97@gmail=2Ecom> wro=
te:
>
>
>On 7 September 2018 10:57:34 BST, Sricharan R
><sricharan@codeaurora=2Eorg> wrote:
>>Hi Craig,
>>
>>
>>>> [v12]
>>>>   * Added my signed-off that was missing in some patches=2E
>>>>   * Added Bjorn's acked that i missed earlier=2E
>>>>
>>>=20
>>>   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=2E So in-case if you
>>still
>>>   have the issues with higher frequencies, can you give a quick
>debug
>>>   and report=2E That would be of great help=2E
>>>=20
>>   Ping on this =2E=2E
>
>Hi, didn't see your last message,
>
>Will have a try on mine in the weekend and report back=2E
>>
>>Regards,
>> Sricharan
>>
>>> Regards,
>>>  Sricharan
>>>=20
>>>=20
>>>> [v11]
>>>>   * Dropped patch 13 and 14 from v10 and
>>>>     merged the qcom-cpufreq-krait driver to the existing
>>qcom-cpufreq-kryo=2Ec
>>>>   * Rebased on top of clk-next
>>>>   * Fixed a bug while populating the pvs version for krait=2E
>>>>
>>>> [v10]
>>>>   * Addressed Stephen's comments to add clocks bindings properties
>>>>     to the newly introduced nodes=2E
>>>>   * Added a change to include opp-supported-hw to qcom-cpufreq=2Ec
>>>>   * 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=2E  =
=20
>
>>>>
>>>> [v9]
>>>>   * Fixed a rebase issue in Makefile and added Tag from Robh=2E
>>>>
>>>> [v8]
>>>>   * Fixed a bug in path#14 pointed out by Viresh and also added
>>tags=2E
>>>>     No change in any other patch=2E
>>>>
>>>> [v7]
>>>>   * Fixed comments from Viresh for cleaning up the error handling
>>>>     in qcom-cpufreq=2Ec=2E Also changed the init function to lateinit
>>>>     call=2E This is required because nvmem which gets initialised
>with
>>>>     module_init needs to go first=2E
>>>>   * Fixed Rob's comments for bindings documentation
>>>>   * Fixed kbuild build issue in clk-lpc32xx=2Ec
>>>>   * 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,
>>accordingly
>>>>     dropped patch #12 and corrected patch #11 from previous patch
>>set in [4]
>>>>   * Converted to use #spdx tags for newly introduced files
>>>>
>>>> Mostly a resend of the v3 posted by Stephen quite some time back
>[1]
>>>> except for few changes=2E
>>>>   Based on reading some feedback from list,
>>>>   * Dropped the patch "clk: Add safe switch hook" from v3 [2]=2E
>>>>     Now this is taken care by patch#10 in this series only for
>>Krait=2E
>>>>   * Dropped the path "clk: Avoid sending high rates to downstream
>>>> 		      clocks during set_rate" from v3 [3]=2E
>>>>   * Rebased on top of clk-next=2E
>>>>   * Dropped the DT update from the series=2E Will send separately
>>>>   * Now with cpufreq-dt+opp supporting voltage scaling, registering
>>the
>>>>     krait cpu supplies in DT should be sufficient=2E But one issue
>is,
>>>>     the qcom-cpufreq drivers reads the efuse and based on that
>>registers
>>>>     the opp data and then registers the cpufreq-dt device=2E So when
>>>>     cpufreq-dt driver probes and registers the regulator to the OPP
>>framework,
>>>>     it expects that the opp data for the device should not be
>>registered before
>>>>     the regulator=2E Will send a RFC patch removing that check, to
>>find out the
>>>>     right way of doing it=2E
>>>>
>>>> These patches provide cpufreq scaling on devices with Krait CPUs=2E
>>>> In Krait CPU designs there's one PLL and two muxes per CPU,
>allowing
>>>> us to switch CPU frequencies independently=2E
>>>>
>>>> 				 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=2E CPUfreq only interacts
>>>> with the primary mux (farthest right in the diagram)=2E When CPUfreq
>>>> sets a rate, the mux code finds the best parent that can provide
>the
>>rate=2E
>>>> Due to the design, QSB and the top PLL are always a fixed rate and
>>thus
>>>> only support one frequency each=2E These sources provide the lowest
>>>> frequencies for the CPUs=2E The HFPLLs are where we can make the CPU
>>go
>>>> faster (GHz range)=2E Sometimes we need to run the HFPLL twice as
>>>> fast and divide it by two to get a particular frequency=2E
>>>>
>>>> When switching rates we can't leave the CPU clocked by the HFPLL
>>because
>>>> we need to turn off the output of the PLL when changing its
>>frequency=2E
>>>> This means we have to switch over to the secondary mux and use one
>>of the
>>>> fixed sources=2E This is why we need something like the safe parent
>>patch=2E
>>>>
>>>> [1]
>>http://lists=2Einfradead=2Eorg/pipermail/linux-arm-kernel/2015-March/332=
607=2Ehtml
>>>> [2]
>>http://lists=2Einfradead=2Eorg/pipermail/linux-arm-kernel/2015-March/332=
615=2Ehtml
>>>> [3]
>>http://lists=2Einfradead=2Eorg/pipermail/linux-arm-kernel/2015-March/332=
608=2Ehtml
>>>> [4] https://lwn=2Enet/Articles/740994/=20
>>>> [5] https://lkml=2Eorg/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
>>>>     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
>>>>
>>>>  =2E=2E=2E/devicetree/bindings/arm/msm/qcom,kpss-acc=2Etxt  |  19 +
>>>>  =2E=2E=2E/devicetree/bindings/arm/msm/qcom,kpss-gcc=2Etxt  |  44 +++
>>>>  =2E=2E=2E/devicetree/bindings/clock/qcom,hfpll=2Etxt       |  60 +++=
+
>>>>  =2E=2E=2E/devicetree/bindings/clock/qcom,krait-cc=2Etxt    |  34 ++
>>>>  =2E=2E=2E/{kryo-cpufreq=2Etxt =3D> qcom-nvmem-cpufreq=2Etxt}   |   7=
 +-
>>>>  arch/arm/common/Kconfig                            |   3 +
>>>>  arch/arm/common/Makefile                           |   1 +
>>>>  arch/arm/common/krait-l2-accessors=2Ec               |  48 +++
>>>>  arch/arm/include/asm/krait-l2-accessors=2Eh          |   9 +
>>>>  drivers/clk/qcom/Kconfig                           |  28 ++
>>>>  drivers/clk/qcom/Makefile                          |   5 +
>>>>  drivers/clk/qcom/clk-hfpll=2Ec                       | 244
>>+++++++++++++
>>>>  drivers/clk/qcom/clk-hfpll=2Eh                       |  44 +++
>>>>  drivers/clk/qcom/clk-krait=2Ec                       | 126 +++++++
>>>>  drivers/clk/qcom/clk-krait=2Eh                       |  40 +++
>>>>  drivers/clk/qcom/gcc-ipq806x=2Ec                     |  82 +++++
>>>>  drivers/clk/qcom/gcc-msm8960=2Ec                     | 172 +++++++++
>>>>  drivers/clk/qcom/hfpll=2Ec                           |  96 +++++
>>>>  drivers/clk/qcom/kpss-xcc=2Ec                        |  87 +++++
>>>>  drivers/clk/qcom/krait-cc=2Ec                        | 397
>>+++++++++++++++++++++
>>>>  drivers/cpufreq/Kconfig=2Earm                        |   6 +-
>>>>  drivers/cpufreq/Makefile                           |   2 +-
>>>>  drivers/cpufreq/cpufreq-dt-platdev=2Ec               |   5 +
>>>>  drivers/cpufreq/qcom-cpufreq-kryo=2Ec                | 232
>>------------
>>>>  drivers/cpufreq/qcom-cpufreq-nvmem=2Ec               | 387
>>++++++++++++++++++++
>>>>  include/dt-bindings/clock/qcom,gcc-msm8960=2Eh       |   2 +
>>>>  26 files changed, 1941 insertions(+), 239 deletions(-)
>>>>  create mode 100644
>>Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc=2Etxt
>>>>  create mode 100644
>>Documentation/devicetree/bindings/clock/qcom,hfpll=2Etxt
>>>>  create mode 100644
>>Documentation/devicetree/bindings/clock/qcom,krait-cc=2Etxt
>>>>  rename Documentation/devicetree/bindings/opp/{kryo-cpufreq=2Etxt =3D=
>
>>qcom-nvmem-cpufreq=2Etxt} (98%)
>>>>  create mode 100644 arch/arm/common/krait-l2-accessors=2Ec
>>>>  create mode 100644 arch/arm/include/asm/krait-l2-accessors=2Eh
>>>>  create mode 100644 drivers/clk/qcom/clk-hfpll=2Ec
>>>>  create mode 100644 drivers/clk/qcom/clk-hfpll=2Eh
>>>>  create mode 100644 drivers/clk/qcom/clk-krait=2Ec
>>>>  create mode 100644 drivers/clk/qcom/clk-krait=2Eh
>>>>  create mode 100644 drivers/clk/qcom/hfpll=2Ec
>>>>  create mode 100644 drivers/clk/qcom/kpss-xcc=2Ec
>>>>  create mode 100644 drivers/clk/qcom/krait-cc=2Ec
>>>>  delete mode 100644 drivers/cpufreq/qcom-cpufreq-kryo=2Ec
>>>>  create mode 100644 drivers/cpufreq/qcom-cpufreq-nvmem=2Ec
>>>>
>>>=20

--=20
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